net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static LIST_HEAD(nf_tables_gc_list);
  35 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  36 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
  37
  38 enum {
  39         NFT_VALIDATE_SKIP       = 0,
  40         NFT_VALIDATE_NEED,
  41         NFT_VALIDATE_DO,
  42 };
  43
  44 static struct rhltable nft_objname_ht;
  45
  46 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  47 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  48 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  49
  50 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  51 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  52 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  53
  54 static const struct rhashtable_params nft_chain_ht_params = {
  55         .head_offset            = offsetof(struct nft_chain, rhlhead),
  56         .key_offset             = offsetof(struct nft_chain, name),
  57         .hashfn                 = nft_chain_hash,
  58         .obj_hashfn             = nft_chain_hash_obj,
  59         .obj_cmpfn              = nft_chain_hash_cmp,
  60         .automatic_shrinking    = true,
  61 };
  62
  63 static const struct rhashtable_params nft_objname_ht_params = {
  64         .head_offset            = offsetof(struct nft_object, rhlhead),
  65         .key_offset             = offsetof(struct nft_object, key),
  66         .hashfn                 = nft_objname_hash,
  67         .obj_hashfn             = nft_objname_hash_obj,
  68         .obj_cmpfn              = nft_objname_hash_cmp,
  69         .automatic_shrinking    = true,
  70 };
  71
  72 struct nft_audit_data {
  73         struct nft_table *table;
  74         int entries;
  75         int op;
  76         struct list_head list;
  77 };
  78
  79 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  80         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  81         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  82         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  83         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  84         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  85         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  86         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  87         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  88         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  89         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  90         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  91         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  92         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  93         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  94         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  95         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  96         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  97         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  99         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
 100         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
 101         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 102         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 103         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 104         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 105         [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
 106 };
 107
 108 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 109 {
 110         switch (table->validate_state) {
 111         case NFT_VALIDATE_SKIP:
 112                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 113                 break;
 114         case NFT_VALIDATE_NEED:
 115                 break;
 116         case NFT_VALIDATE_DO:
 117                 if (new_validate_state == NFT_VALIDATE_NEED)
 118                         return;
 119         }
 120
 121         table->validate_state = new_validate_state;
 122 }
 123 static void nf_tables_trans_destroy_work(struct work_struct *w);
 124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 125
 126 static void nft_trans_gc_work(struct work_struct *work);
 127 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
 128
 129 static void nft_ctx_init(struct nft_ctx *ctx,
 130                          struct net *net,
 131                          const struct sk_buff *skb,
 132                          const struct nlmsghdr *nlh,
 133                          u8 family,
 134                          struct nft_table *table,
 135                          struct nft_chain *chain,
 136                          const struct nlattr * const *nla)
 137 {
 138         ctx->net        = net;
 139         ctx->family     = family;
 140         ctx->level      = 0;
 141         ctx->table      = table;
 142         ctx->chain      = chain;
 143         ctx->nla        = nla;
 144         ctx->portid     = NETLINK_CB(skb).portid;
 145         ctx->report     = nlmsg_report(nlh);
 146         ctx->flags      = nlh->nlmsg_flags;
 147         ctx->seq        = nlh->nlmsg_seq;
 148 }
 149
 150 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 151                                              int msg_type, u32 size, gfp_t gfp)
 152 {
 153         struct nft_trans *trans;
 154
 155         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 156         if (trans == NULL)
 157                 return NULL;
 158
 159         INIT_LIST_HEAD(&trans->list);
 160         INIT_LIST_HEAD(&trans->binding_list);
 161         trans->msg_type = msg_type;
 162         trans->ctx      = *ctx;
 163
 164         return trans;
 165 }
 166
 167 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 168                                          int msg_type, u32 size)
 169 {
 170         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 171 }
 172
 173 static void nft_trans_list_del(struct nft_trans *trans)
 174 {
 175         list_del(&trans->list);
 176         list_del(&trans->binding_list);
 177 }
 178
 179 static void nft_trans_destroy(struct nft_trans *trans)
 180 {
 181         nft_trans_list_del(trans);
 182         kfree(trans);
 183 }
 184
 185 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
 186                                  bool bind)
 187 {
 188         struct nftables_pernet *nft_net;
 189         struct net *net = ctx->net;
 190         struct nft_trans *trans;
 191
 192         if (!nft_set_is_anonymous(set))
 193                 return;
 194
 195         nft_net = nft_pernet(net);
 196         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 197                 switch (trans->msg_type) {
 198                 case NFT_MSG_NEWSET:
 199                         if (nft_trans_set(trans) == set)
 200                                 nft_trans_set_bound(trans) = bind;
 201                         break;
 202                 case NFT_MSG_NEWSETELEM:
 203                         if (nft_trans_elem_set(trans) == set)
 204                                 nft_trans_elem_set_bound(trans) = bind;
 205                         break;
 206                 }
 207         }
 208 }
 209
 210 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 211 {
 212         return __nft_set_trans_bind(ctx, set, true);
 213 }
 214
 215 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
 216 {
 217         return __nft_set_trans_bind(ctx, set, false);
 218 }
 219
 220 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
 221                                    struct nft_chain *chain, bool bind)
 222 {
 223         struct nftables_pernet *nft_net;
 224         struct net *net = ctx->net;
 225         struct nft_trans *trans;
 226
 227         if (!nft_chain_binding(chain))
 228                 return;
 229
 230         nft_net = nft_pernet(net);
 231         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 232                 switch (trans->msg_type) {
 233                 case NFT_MSG_NEWCHAIN:
 234                         if (nft_trans_chain(trans) == chain)
 235                                 nft_trans_chain_bound(trans) = bind;
 236                         break;
 237                 case NFT_MSG_NEWRULE:
 238                         if (trans->ctx.chain == chain)
 239                                 nft_trans_rule_bound(trans) = bind;
 240                         break;
 241                 }
 242         }
 243 }
 244
 245 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
 246                                  struct nft_chain *chain)
 247 {
 248         __nft_chain_trans_bind(ctx, chain, true);
 249 }
 250
 251 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 252 {
 253         if (!nft_chain_binding(chain))
 254                 return 0;
 255
 256         if (nft_chain_binding(ctx->chain))
 257                 return -EOPNOTSUPP;
 258
 259         if (chain->bound)
 260                 return -EBUSY;
 261
 262         if (!nft_use_inc(&chain->use))
 263                 return -EMFILE;
 264
 265         chain->bound = true;
 266         nft_chain_trans_bind(ctx, chain);
 267
 268         return 0;
 269 }
 270
 271 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 272 {
 273         __nft_chain_trans_bind(ctx, chain, false);
 274 }
 275
 276 static int nft_netdev_register_hooks(struct net *net,
 277                                      struct list_head *hook_list)
 278 {
 279         struct nft_hook *hook;
 280         int err, j;
 281
 282         j = 0;
 283         list_for_each_entry(hook, hook_list, list) {
 284                 err = nf_register_net_hook(net, &hook->ops);
 285                 if (err < 0)
 286                         goto err_register;
 287
 288                 j++;
 289         }
 290         return 0;
 291
 292 err_register:
 293         list_for_each_entry(hook, hook_list, list) {
 294                 if (j-- <= 0)
 295                         break;
 296
 297                 nf_unregister_net_hook(net, &hook->ops);
 298         }
 299         return err;
 300 }
 301
 302 static void nft_netdev_unregister_hooks(struct net *net,
 303                                         struct list_head *hook_list,
 304                                         bool release_netdev)
 305 {
 306         struct nft_hook *hook, *next;
 307
 308         list_for_each_entry_safe(hook, next, hook_list, list) {
 309                 nf_unregister_net_hook(net, &hook->ops);
 310                 if (release_netdev) {
 311                         list_del(&hook->list);
 312                         kfree_rcu(hook, rcu);
 313                 }
 314         }
 315 }
 316
 317 static int nf_tables_register_hook(struct net *net,
 318                                    const struct nft_table *table,
 319                                    struct nft_chain *chain)
 320 {
 321         struct nft_base_chain *basechain;
 322         const struct nf_hook_ops *ops;
 323
 324         if (table->flags & NFT_TABLE_F_DORMANT ||
 325             !nft_is_base_chain(chain))
 326                 return 0;
 327
 328         basechain = nft_base_chain(chain);
 329         ops = &basechain->ops;
 330
 331         if (basechain->type->ops_register)
 332                 return basechain->type->ops_register(net, ops);
 333
 334         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 335                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 336
 337         return nf_register_net_hook(net, &basechain->ops);
 338 }
 339
 340 static void __nf_tables_unregister_hook(struct net *net,
 341                                         const struct nft_table *table,
 342                                         struct nft_chain *chain,
 343                                         bool release_netdev)
 344 {
 345         struct nft_base_chain *basechain;
 346         const struct nf_hook_ops *ops;
 347
 348         if (table->flags & NFT_TABLE_F_DORMANT ||
 349             !nft_is_base_chain(chain))
 350                 return;
 351         basechain = nft_base_chain(chain);
 352         ops = &basechain->ops;
 353
 354         if (basechain->type->ops_unregister)
 355                 return basechain->type->ops_unregister(net, ops);
 356
 357         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 358                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 359                                             release_netdev);
 360         else
 361                 nf_unregister_net_hook(net, &basechain->ops);
 362 }
 363
 364 static void nf_tables_unregister_hook(struct net *net,
 365                                       const struct nft_table *table,
 366                                       struct nft_chain *chain)
 367 {
 368         return __nf_tables_unregister_hook(net, table, chain, false);
 369 }
 370
 371 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 372 {
 373         struct nftables_pernet *nft_net = nft_pernet(net);
 374
 375         switch (trans->msg_type) {
 376         case NFT_MSG_NEWSET:
 377                 if (!nft_trans_set_update(trans) &&
 378                     nft_set_is_anonymous(nft_trans_set(trans)))
 379                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 380                 break;
 381         case NFT_MSG_NEWCHAIN:
 382                 if (!nft_trans_chain_update(trans) &&
 383                     nft_chain_binding(nft_trans_chain(trans)))
 384                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 385                 break;
 386         }
 387
 388         list_add_tail(&trans->list, &nft_net->commit_list);
 389 }
 390
 391 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 392 {
 393         struct nft_trans *trans;
 394
 395         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 396         if (trans == NULL)
 397                 return -ENOMEM;
 398
 399         if (msg_type == NFT_MSG_NEWTABLE)
 400                 nft_activate_next(ctx->net, ctx->table);
 401
 402         nft_trans_commit_list_add_tail(ctx->net, trans);
 403         return 0;
 404 }
 405
 406 static int nft_deltable(struct nft_ctx *ctx)
 407 {
 408         int err;
 409
 410         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 411         if (err < 0)
 412                 return err;
 413
 414         nft_deactivate_next(ctx->net, ctx->table);
 415         return err;
 416 }
 417
 418 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 419 {
 420         struct nft_trans *trans;
 421
 422         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 423         if (trans == NULL)
 424                 return ERR_PTR(-ENOMEM);
 425
 426         if (msg_type == NFT_MSG_NEWCHAIN) {
 427                 nft_activate_next(ctx->net, ctx->chain);
 428
 429                 if (ctx->nla[NFTA_CHAIN_ID]) {
 430                         nft_trans_chain_id(trans) =
 431                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 432                 }
 433         }
 434         nft_trans_chain(trans) = ctx->chain;
 435         nft_trans_commit_list_add_tail(ctx->net, trans);
 436
 437         return trans;
 438 }
 439
 440 static int nft_delchain(struct nft_ctx *ctx)
 441 {
 442         struct nft_trans *trans;
 443
 444         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 445         if (IS_ERR(trans))
 446                 return PTR_ERR(trans);
 447
 448         nft_use_dec(&ctx->table->use);
 449         nft_deactivate_next(ctx->net, ctx->chain);
 450
 451         return 0;
 452 }
 453
 454 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
 455 {
 456         struct nft_expr *expr;
 457
 458         expr = nft_expr_first(rule);
 459         while (nft_expr_more(rule, expr)) {
 460                 if (expr->ops->activate)
 461                         expr->ops->activate(ctx, expr);
 462
 463                 expr = nft_expr_next(expr);
 464         }
 465 }
 466
 467 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
 468                               enum nft_trans_phase phase)
 469 {
 470         struct nft_expr *expr;
 471
 472         expr = nft_expr_first(rule);
 473         while (nft_expr_more(rule, expr)) {
 474                 if (expr->ops->deactivate)
 475                         expr->ops->deactivate(ctx, expr, phase);
 476
 477                 expr = nft_expr_next(expr);
 478         }
 479 }
 480
 481 static int
 482 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 483 {
 484         /* You cannot delete the same rule twice */
 485         if (nft_is_active_next(ctx->net, rule)) {
 486                 nft_deactivate_next(ctx->net, rule);
 487                 nft_use_dec(&ctx->chain->use);
 488                 return 0;
 489         }
 490         return -ENOENT;
 491 }
 492
 493 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 494                                             struct nft_rule *rule)
 495 {
 496         struct nft_trans *trans;
 497
 498         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 499         if (trans == NULL)
 500                 return NULL;
 501
 502         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 503                 nft_trans_rule_id(trans) =
 504                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 505         }
 506         nft_trans_rule(trans) = rule;
 507         nft_trans_commit_list_add_tail(ctx->net, trans);
 508
 509         return trans;
 510 }
 511
 512 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 513 {
 514         struct nft_flow_rule *flow;
 515         struct nft_trans *trans;
 516         int err;
 517
 518         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 519         if (trans == NULL)
 520                 return -ENOMEM;
 521
 522         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 523                 flow = nft_flow_rule_create(ctx->net, rule);
 524                 if (IS_ERR(flow)) {
 525                         nft_trans_destroy(trans);
 526                         return PTR_ERR(flow);
 527                 }
 528
 529                 nft_trans_flow_rule(trans) = flow;
 530         }
 531
 532         err = nf_tables_delrule_deactivate(ctx, rule);
 533         if (err < 0) {
 534                 nft_trans_destroy(trans);
 535                 return err;
 536         }
 537         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 538
 539         return 0;
 540 }
 541
 542 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 543 {
 544         struct nft_rule *rule;
 545         int err;
 546
 547         list_for_each_entry(rule, &ctx->chain->rules, list) {
 548                 if (!nft_is_active_next(ctx->net, rule))
 549                         continue;
 550
 551                 err = nft_delrule(ctx, rule);
 552                 if (err < 0)
 553                         return err;
 554         }
 555         return 0;
 556 }
 557
 558 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 559                                struct nft_set *set,
 560                                const struct nft_set_desc *desc)
 561 {
 562         struct nft_trans *trans;
 563
 564         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 565         if (trans == NULL)
 566                 return -ENOMEM;
 567
 568         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 569                 nft_trans_set_id(trans) =
 570                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 571                 nft_activate_next(ctx->net, set);
 572         }
 573         nft_trans_set(trans) = set;
 574         if (desc) {
 575                 nft_trans_set_update(trans) = true;
 576                 nft_trans_set_gc_int(trans) = desc->gc_int;
 577                 nft_trans_set_timeout(trans) = desc->timeout;
 578                 nft_trans_set_size(trans) = desc->size;
 579         }
 580         nft_trans_commit_list_add_tail(ctx->net, trans);
 581
 582         return 0;
 583 }
 584
 585 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 586                              struct nft_set *set)
 587 {
 588         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 589 }
 590
 591 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
 592                                   struct nft_set *set,
 593                                   const struct nft_set_iter *iter,
 594                                   struct nft_set_elem *elem)
 595 {
 596         nft_setelem_data_deactivate(ctx->net, set, elem);
 597
 598         return 0;
 599 }
 600
 601 struct nft_set_elem_catchall {
 602         struct list_head        list;
 603         struct rcu_head         rcu;
 604         void                    *elem;
 605 };
 606
 607 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
 608                                         struct nft_set *set)
 609 {
 610         u8 genmask = nft_genmask_next(ctx->net);
 611         struct nft_set_elem_catchall *catchall;
 612         struct nft_set_elem elem;
 613         struct nft_set_ext *ext;
 614
 615         list_for_each_entry(catchall, &set->catchall_list, list) {
 616                 ext = nft_set_elem_ext(set, catchall->elem);
 617                 if (!nft_set_elem_active(ext, genmask))
 618                         continue;
 619
 620                 elem.priv = catchall->elem;
 621                 nft_setelem_data_deactivate(ctx->net, set, &elem);
 622                 break;
 623         }
 624 }
 625
 626 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
 627 {
 628         struct nft_set_iter iter = {
 629                 .genmask        = nft_genmask_next(ctx->net),
 630                 .fn             = nft_mapelem_deactivate,
 631         };
 632
 633         set->ops->walk(ctx, set, &iter);
 634         WARN_ON_ONCE(iter.err);
 635
 636         nft_map_catchall_deactivate(ctx, set);
 637 }
 638
 639 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 640 {
 641         int err;
 642
 643         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 644         if (err < 0)
 645                 return err;
 646
 647         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
 648                 nft_map_deactivate(ctx, set);
 649
 650         nft_deactivate_next(ctx->net, set);
 651         nft_use_dec(&ctx->table->use);
 652
 653         return err;
 654 }
 655
 656 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 657                              struct nft_object *obj)
 658 {
 659         struct nft_trans *trans;
 660
 661         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 662         if (trans == NULL)
 663                 return -ENOMEM;
 664
 665         if (msg_type == NFT_MSG_NEWOBJ)
 666                 nft_activate_next(ctx->net, obj);
 667
 668         nft_trans_obj(trans) = obj;
 669         nft_trans_commit_list_add_tail(ctx->net, trans);
 670
 671         return 0;
 672 }
 673
 674 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 675 {
 676         int err;
 677
 678         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 679         if (err < 0)
 680                 return err;
 681
 682         nft_deactivate_next(ctx->net, obj);
 683         nft_use_dec(&ctx->table->use);
 684
 685         return err;
 686 }
 687
 688 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 689                                    struct nft_flowtable *flowtable)
 690 {
 691         struct nft_trans *trans;
 692
 693         trans = nft_trans_alloc(ctx, msg_type,
 694                                 sizeof(struct nft_trans_flowtable));
 695         if (trans == NULL)
 696                 return -ENOMEM;
 697
 698         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 699                 nft_activate_next(ctx->net, flowtable);
 700
 701         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 702         nft_trans_flowtable(trans) = flowtable;
 703         nft_trans_commit_list_add_tail(ctx->net, trans);
 704
 705         return 0;
 706 }
 707
 708 static int nft_delflowtable(struct nft_ctx *ctx,
 709                             struct nft_flowtable *flowtable)
 710 {
 711         int err;
 712
 713         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 714         if (err < 0)
 715                 return err;
 716
 717         nft_deactivate_next(ctx->net, flowtable);
 718         nft_use_dec(&ctx->table->use);
 719
 720         return err;
 721 }
 722
 723 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 724 {
 725         int i;
 726
 727         for (i = track->regs[dreg].num_reg; i > 0; i--)
 728                 __nft_reg_track_cancel(track, dreg - i);
 729 }
 730
 731 static void __nft_reg_track_update(struct nft_regs_track *track,
 732                                    const struct nft_expr *expr,
 733                                    u8 dreg, u8 num_reg)
 734 {
 735         track->regs[dreg].selector = expr;
 736         track->regs[dreg].bitwise = NULL;
 737         track->regs[dreg].num_reg = num_reg;
 738 }
 739
 740 void nft_reg_track_update(struct nft_regs_track *track,
 741                           const struct nft_expr *expr, u8 dreg, u8 len)
 742 {
 743         unsigned int regcount;
 744         int i;
 745
 746         __nft_reg_track_clobber(track, dreg);
 747
 748         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 749         for (i = 0; i < regcount; i++, dreg++)
 750                 __nft_reg_track_update(track, expr, dreg, i);
 751 }
 752 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 753
 754 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 755 {
 756         unsigned int regcount;
 757         int i;
 758
 759         __nft_reg_track_clobber(track, dreg);
 760
 761         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 762         for (i = 0; i < regcount; i++, dreg++)
 763                 __nft_reg_track_cancel(track, dreg);
 764 }
 765 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 766
 767 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 768 {
 769         track->regs[dreg].selector = NULL;
 770         track->regs[dreg].bitwise = NULL;
 771         track->regs[dreg].num_reg = 0;
 772 }
 773 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 774
 775 /*
 776  * Tables
 777  */
 778
 779 static struct nft_table *nft_table_lookup(const struct net *net,
 780                                           const struct nlattr *nla,
 781                                           u8 family, u8 genmask, u32 nlpid)
 782 {
 783         struct nftables_pernet *nft_net;
 784         struct nft_table *table;
 785
 786         if (nla == NULL)
 787                 return ERR_PTR(-EINVAL);
 788
 789         nft_net = nft_pernet(net);
 790         list_for_each_entry_rcu(table, &nft_net->tables, list,
 791                                 lockdep_is_held(&nft_net->commit_mutex)) {
 792                 if (!nla_strcmp(nla, table->name) &&
 793                     table->family == family &&
 794                     nft_active_genmask(table, genmask)) {
 795                         if (nft_table_has_owner(table) &&
 796                             nlpid && table->nlpid != nlpid)
 797                                 return ERR_PTR(-EPERM);
 798
 799                         return table;
 800                 }
 801         }
 802
 803         return ERR_PTR(-ENOENT);
 804 }
 805
 806 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 807                                                    const struct nlattr *nla,
 808                                                    u8 genmask, u32 nlpid)
 809 {
 810         struct nftables_pernet *nft_net;
 811         struct nft_table *table;
 812
 813         nft_net = nft_pernet(net);
 814         list_for_each_entry(table, &nft_net->tables, list) {
 815                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 816                     nft_active_genmask(table, genmask)) {
 817                         if (nft_table_has_owner(table) &&
 818                             nlpid && table->nlpid != nlpid)
 819                                 return ERR_PTR(-EPERM);
 820
 821                         return table;
 822                 }
 823         }
 824
 825         return ERR_PTR(-ENOENT);
 826 }
 827
 828 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 829 {
 830         return ++table->hgenerator;
 831 }
 832
 833 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 834
 835 static const struct nft_chain_type *
 836 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 837 {
 838         if (family >= NFPROTO_NUMPROTO ||
 839             type >= NFT_CHAIN_T_MAX)
 840                 return NULL;
 841
 842         return chain_type[family][type];
 843 }
 844
 845 static const struct nft_chain_type *
 846 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 847 {
 848         const struct nft_chain_type *type;
 849         int i;
 850
 851         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 852                 type = __nft_chain_type_get(family, i);
 853                 if (!type)
 854                         continue;
 855                 if (!nla_strcmp(nla, type->name))
 856                         return type;
 857         }
 858         return NULL;
 859 }
 860
 861 struct nft_module_request {
 862         struct list_head        list;
 863         char                    module[MODULE_NAME_LEN];
 864         bool                    done;
 865 };
 866
 867 #ifdef CONFIG_MODULES
 868 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 869                                       ...)
 870 {
 871         char module_name[MODULE_NAME_LEN];
 872         struct nftables_pernet *nft_net;
 873         struct nft_module_request *req;
 874         va_list args;
 875         int ret;
 876
 877         va_start(args, fmt);
 878         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 879         va_end(args);
 880         if (ret >= MODULE_NAME_LEN)
 881                 return 0;
 882
 883         nft_net = nft_pernet(net);
 884         list_for_each_entry(req, &nft_net->module_list, list) {
 885                 if (!strcmp(req->module, module_name)) {
 886                         if (req->done)
 887                                 return 0;
 888
 889                         /* A request to load this module already exists. */
 890                         return -EAGAIN;
 891                 }
 892         }
 893
 894         req = kmalloc(sizeof(*req), GFP_KERNEL);
 895         if (!req)
 896                 return -ENOMEM;
 897
 898         req->done = false;
 899         strscpy(req->module, module_name, MODULE_NAME_LEN);
 900         list_add_tail(&req->list, &nft_net->module_list);
 901
 902         return -EAGAIN;
 903 }
 904 EXPORT_SYMBOL_GPL(nft_request_module);
 905 #endif
 906
 907 static void lockdep_nfnl_nft_mutex_not_held(void)
 908 {
 909 #ifdef CONFIG_PROVE_LOCKING
 910         if (debug_locks)
 911                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 912 #endif
 913 }
 914
 915 static const struct nft_chain_type *
 916 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 917                             u8 family, bool autoload)
 918 {
 919         const struct nft_chain_type *type;
 920
 921         type = __nf_tables_chain_type_lookup(nla, family);
 922         if (type != NULL)
 923                 return type;
 924
 925         lockdep_nfnl_nft_mutex_not_held();
 926 #ifdef CONFIG_MODULES
 927         if (autoload) {
 928                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 929                                        nla_len(nla),
 930                                        (const char *)nla_data(nla)) == -EAGAIN)
 931                         return ERR_PTR(-EAGAIN);
 932         }
 933 #endif
 934         return ERR_PTR(-ENOENT);
 935 }
 936
 937 static __be16 nft_base_seq(const struct net *net)
 938 {
 939         struct nftables_pernet *nft_net = nft_pernet(net);
 940
 941         return htons(nft_net->base_seq & 0xffff);
 942 }
 943
 944 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 945         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 946                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 947         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 948         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 949         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 950                                     .len = NFT_USERDATA_MAXLEN }
 951 };
 952
 953 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 954                                      u32 portid, u32 seq, int event, u32 flags,
 955                                      int family, const struct nft_table *table)
 956 {
 957         struct nlmsghdr *nlh;
 958
 959         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 960         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 961                            NFNETLINK_V0, nft_base_seq(net));
 962         if (!nlh)
 963                 goto nla_put_failure;
 964
 965         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 966             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 967             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 968                          NFTA_TABLE_PAD))
 969                 goto nla_put_failure;
 970
 971         if (event == NFT_MSG_DELTABLE) {
 972                 nlmsg_end(skb, nlh);
 973                 return 0;
 974         }
 975
 976         if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
 977                          htonl(table->flags & NFT_TABLE_F_MASK)))
 978                 goto nla_put_failure;
 979
 980         if (nft_table_has_owner(table) &&
 981             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 982                 goto nla_put_failure;
 983
 984         if (table->udata) {
 985                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 986                         goto nla_put_failure;
 987         }
 988
 989         nlmsg_end(skb, nlh);
 990         return 0;
 991
 992 nla_put_failure:
 993         nlmsg_trim(skb, nlh);
 994         return -1;
 995 }
 996
 997 struct nftnl_skb_parms {
 998         bool report;
 999 };
1000 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
1001
1002 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1003                                struct list_head *notify_list)
1004 {
1005         NFT_CB(skb).report = report;
1006         list_add_tail(&skb->list, notify_list);
1007 }
1008
1009 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1010 {
1011         struct nftables_pernet *nft_net;
1012         struct sk_buff *skb;
1013         u16 flags = 0;
1014         int err;
1015
1016         if (!ctx->report &&
1017             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1018                 return;
1019
1020         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1021         if (skb == NULL)
1022                 goto err;
1023
1024         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1025                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1026
1027         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1028                                         event, flags, ctx->family, ctx->table);
1029         if (err < 0) {
1030                 kfree_skb(skb);
1031                 goto err;
1032         }
1033
1034         nft_net = nft_pernet(ctx->net);
1035         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1036         return;
1037 err:
1038         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1039 }
1040
1041 static int nf_tables_dump_tables(struct sk_buff *skb,
1042                                  struct netlink_callback *cb)
1043 {
1044         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1045         struct nftables_pernet *nft_net;
1046         const struct nft_table *table;
1047         unsigned int idx = 0, s_idx = cb->args[0];
1048         struct net *net = sock_net(skb->sk);
1049         int family = nfmsg->nfgen_family;
1050
1051         rcu_read_lock();
1052         nft_net = nft_pernet(net);
1053         cb->seq = READ_ONCE(nft_net->base_seq);
1054
1055         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1056                 if (family != NFPROTO_UNSPEC && family != table->family)
1057                         continue;
1058
1059                 if (idx < s_idx)
1060                         goto cont;
1061                 if (idx > s_idx)
1062                         memset(&cb->args[1], 0,
1063                                sizeof(cb->args) - sizeof(cb->args[0]));
1064                 if (!nft_is_active(net, table))
1065                         continue;
1066                 if (nf_tables_fill_table_info(skb, net,
1067                                               NETLINK_CB(cb->skb).portid,
1068                                               cb->nlh->nlmsg_seq,
1069                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
1070                                               table->family, table) < 0)
1071                         goto done;
1072
1073                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1074 cont:
1075                 idx++;
1076         }
1077 done:
1078         rcu_read_unlock();
1079         cb->args[0] = idx;
1080         return skb->len;
1081 }
1082
1083 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1084                                       const struct nlmsghdr *nlh,
1085                                       struct netlink_dump_control *c)
1086 {
1087         int err;
1088
1089         if (!try_module_get(THIS_MODULE))
1090                 return -EINVAL;
1091
1092         rcu_read_unlock();
1093         err = netlink_dump_start(nlsk, skb, nlh, c);
1094         rcu_read_lock();
1095         module_put(THIS_MODULE);
1096
1097         return err;
1098 }
1099
1100 /* called with rcu_read_lock held */
1101 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1102                               const struct nlattr * const nla[])
1103 {
1104         struct netlink_ext_ack *extack = info->extack;
1105         u8 genmask = nft_genmask_cur(info->net);
1106         u8 family = info->nfmsg->nfgen_family;
1107         const struct nft_table *table;
1108         struct net *net = info->net;
1109         struct sk_buff *skb2;
1110         int err;
1111
1112         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1113                 struct netlink_dump_control c = {
1114                         .dump = nf_tables_dump_tables,
1115                         .module = THIS_MODULE,
1116                 };
1117
1118                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1119         }
1120
1121         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1122         if (IS_ERR(table)) {
1123                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1124                 return PTR_ERR(table);
1125         }
1126
1127         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1128         if (!skb2)
1129                 return -ENOMEM;
1130
1131         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1132                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1133                                         0, family, table);
1134         if (err < 0)
1135                 goto err_fill_table_info;
1136
1137         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1138
1139 err_fill_table_info:
1140         kfree_skb(skb2);
1141         return err;
1142 }
1143
1144 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1145 {
1146         struct nft_chain *chain;
1147         u32 i = 0;
1148
1149         list_for_each_entry(chain, &table->chains, list) {
1150                 if (!nft_is_active_next(net, chain))
1151                         continue;
1152                 if (!nft_is_base_chain(chain))
1153                         continue;
1154
1155                 if (cnt && i++ == cnt)
1156                         break;
1157
1158                 nf_tables_unregister_hook(net, table, chain);
1159         }
1160 }
1161
1162 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1163 {
1164         struct nft_chain *chain;
1165         int err, i = 0;
1166
1167         list_for_each_entry(chain, &table->chains, list) {
1168                 if (!nft_is_active_next(net, chain))
1169                         continue;
1170                 if (!nft_is_base_chain(chain))
1171                         continue;
1172
1173                 err = nf_tables_register_hook(net, table, chain);
1174                 if (err < 0)
1175                         goto err_register_hooks;
1176
1177                 i++;
1178         }
1179         return 0;
1180
1181 err_register_hooks:
1182         if (i)
1183                 nft_table_disable(net, table, i);
1184         return err;
1185 }
1186
1187 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1188 {
1189         table->flags &= ~NFT_TABLE_F_DORMANT;
1190         nft_table_disable(net, table, 0);
1191         table->flags |= NFT_TABLE_F_DORMANT;
1192 }
1193
1194 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1195 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1196 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1197 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1198                                          __NFT_TABLE_F_WAS_AWAKEN)
1199
1200 static int nf_tables_updtable(struct nft_ctx *ctx)
1201 {
1202         struct nft_trans *trans;
1203         u32 flags;
1204         int ret;
1205
1206         if (!ctx->nla[NFTA_TABLE_FLAGS])
1207                 return 0;
1208
1209         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1210         if (flags & ~NFT_TABLE_F_MASK)
1211                 return -EOPNOTSUPP;
1212
1213         if (flags == ctx->table->flags)
1214                 return 0;
1215
1216         if ((nft_table_has_owner(ctx->table) &&
1217              !(flags & NFT_TABLE_F_OWNER)) ||
1218             (!nft_table_has_owner(ctx->table) &&
1219              flags & NFT_TABLE_F_OWNER))
1220                 return -EOPNOTSUPP;
1221
1222         /* No dormant off/on/off/on games in single transaction */
1223         if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1224                 return -EINVAL;
1225
1226         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1227                                 sizeof(struct nft_trans_table));
1228         if (trans == NULL)
1229                 return -ENOMEM;
1230
1231         if ((flags & NFT_TABLE_F_DORMANT) &&
1232             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1233                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1234                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1235                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1236         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1237                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1238                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1239                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1240                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1241                         if (ret < 0)
1242                                 goto err_register_hooks;
1243
1244                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1245                 }
1246         }
1247
1248         nft_trans_table_update(trans) = true;
1249         nft_trans_commit_list_add_tail(ctx->net, trans);
1250
1251         return 0;
1252
1253 err_register_hooks:
1254         nft_trans_destroy(trans);
1255         return ret;
1256 }
1257
1258 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1259 {
1260         const char *name = data;
1261
1262         return jhash(name, strlen(name), seed);
1263 }
1264
1265 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1266 {
1267         const struct nft_chain *chain = data;
1268
1269         return nft_chain_hash(chain->name, 0, seed);
1270 }
1271
1272 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1273                               const void *ptr)
1274 {
1275         const struct nft_chain *chain = ptr;
1276         const char *name = arg->key;
1277
1278         return strcmp(chain->name, name);
1279 }
1280
1281 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1282 {
1283         const struct nft_object_hash_key *k = data;
1284
1285         seed ^= hash_ptr(k->table, 32);
1286
1287         return jhash(k->name, strlen(k->name), seed);
1288 }
1289
1290 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1291 {
1292         const struct nft_object *obj = data;
1293
1294         return nft_objname_hash(&obj->key, 0, seed);
1295 }
1296
1297 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1298                                 const void *ptr)
1299 {
1300         const struct nft_object_hash_key *k = arg->key;
1301         const struct nft_object *obj = ptr;
1302
1303         if (obj->key.table != k->table)
1304                 return -1;
1305
1306         return strcmp(obj->key.name, k->name);
1307 }
1308
1309 static bool nft_supported_family(u8 family)
1310 {
1311         return false
1312 #ifdef CONFIG_NF_TABLES_INET
1313                 || family == NFPROTO_INET
1314 #endif
1315 #ifdef CONFIG_NF_TABLES_IPV4
1316                 || family == NFPROTO_IPV4
1317 #endif
1318 #ifdef CONFIG_NF_TABLES_ARP
1319                 || family == NFPROTO_ARP
1320 #endif
1321 #ifdef CONFIG_NF_TABLES_NETDEV
1322                 || family == NFPROTO_NETDEV
1323 #endif
1324 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1325                 || family == NFPROTO_BRIDGE
1326 #endif
1327 #ifdef CONFIG_NF_TABLES_IPV6
1328                 || family == NFPROTO_IPV6
1329 #endif
1330                 ;
1331 }
1332
1333 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1334                               const struct nlattr * const nla[])
1335 {
1336         struct nftables_pernet *nft_net = nft_pernet(info->net);
1337         struct netlink_ext_ack *extack = info->extack;
1338         u8 genmask = nft_genmask_next(info->net);
1339         u8 family = info->nfmsg->nfgen_family;
1340         struct net *net = info->net;
1341         const struct nlattr *attr;
1342         struct nft_table *table;
1343         struct nft_ctx ctx;
1344         u32 flags = 0;
1345         int err;
1346
1347         if (!nft_supported_family(family))
1348                 return -EOPNOTSUPP;
1349
1350         lockdep_assert_held(&nft_net->commit_mutex);
1351         attr = nla[NFTA_TABLE_NAME];
1352         table = nft_table_lookup(net, attr, family, genmask,
1353                                  NETLINK_CB(skb).portid);
1354         if (IS_ERR(table)) {
1355                 if (PTR_ERR(table) != -ENOENT)
1356                         return PTR_ERR(table);
1357         } else {
1358                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1359                         NL_SET_BAD_ATTR(extack, attr);
1360                         return -EEXIST;
1361                 }
1362                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1363                         return -EOPNOTSUPP;
1364
1365                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1366
1367                 return nf_tables_updtable(&ctx);
1368         }
1369
1370         if (nla[NFTA_TABLE_FLAGS]) {
1371                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1372                 if (flags & ~NFT_TABLE_F_MASK)
1373                         return -EOPNOTSUPP;
1374         }
1375
1376         err = -ENOMEM;
1377         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1378         if (table == NULL)
1379                 goto err_kzalloc;
1380
1381         table->validate_state = nft_net->validate_state;
1382         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1383         if (table->name == NULL)
1384                 goto err_strdup;
1385
1386         if (nla[NFTA_TABLE_USERDATA]) {
1387                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1388                 if (table->udata == NULL)
1389                         goto err_table_udata;
1390
1391                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1392         }
1393
1394         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1395         if (err)
1396                 goto err_chain_ht;
1397
1398         INIT_LIST_HEAD(&table->chains);
1399         INIT_LIST_HEAD(&table->sets);
1400         INIT_LIST_HEAD(&table->objects);
1401         INIT_LIST_HEAD(&table->flowtables);
1402         table->family = family;
1403         table->flags = flags;
1404         table->handle = ++nft_net->table_handle;
1405         if (table->flags & NFT_TABLE_F_OWNER)
1406                 table->nlpid = NETLINK_CB(skb).portid;
1407
1408         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1409         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1410         if (err < 0)
1411                 goto err_trans;
1412
1413         list_add_tail_rcu(&table->list, &nft_net->tables);
1414         return 0;
1415 err_trans:
1416         rhltable_destroy(&table->chains_ht);
1417 err_chain_ht:
1418         kfree(table->udata);
1419 err_table_udata:
1420         kfree(table->name);
1421 err_strdup:
1422         kfree(table);
1423 err_kzalloc:
1424         return err;
1425 }
1426
1427 static int nft_flush_table(struct nft_ctx *ctx)
1428 {
1429         struct nft_flowtable *flowtable, *nft;
1430         struct nft_chain *chain, *nc;
1431         struct nft_object *obj, *ne;
1432         struct nft_set *set, *ns;
1433         int err;
1434
1435         list_for_each_entry(chain, &ctx->table->chains, list) {
1436                 if (!nft_is_active_next(ctx->net, chain))
1437                         continue;
1438
1439                 if (nft_chain_binding(chain))
1440                         continue;
1441
1442                 ctx->chain = chain;
1443
1444                 err = nft_delrule_by_chain(ctx);
1445                 if (err < 0)
1446                         goto out;
1447         }
1448
1449         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1450                 if (!nft_is_active_next(ctx->net, set))
1451                         continue;
1452
1453                 if (nft_set_is_anonymous(set))
1454                         continue;
1455
1456                 err = nft_delset(ctx, set);
1457                 if (err < 0)
1458                         goto out;
1459         }
1460
1461         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1462                 if (!nft_is_active_next(ctx->net, flowtable))
1463                         continue;
1464
1465                 err = nft_delflowtable(ctx, flowtable);
1466                 if (err < 0)
1467                         goto out;
1468         }
1469
1470         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1471                 if (!nft_is_active_next(ctx->net, obj))
1472                         continue;
1473
1474                 err = nft_delobj(ctx, obj);
1475                 if (err < 0)
1476                         goto out;
1477         }
1478
1479         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1480                 if (!nft_is_active_next(ctx->net, chain))
1481                         continue;
1482
1483                 if (nft_chain_binding(chain))
1484                         continue;
1485
1486                 ctx->chain = chain;
1487
1488                 err = nft_delchain(ctx);
1489                 if (err < 0)
1490                         goto out;
1491         }
1492
1493         err = nft_deltable(ctx);
1494 out:
1495         return err;
1496 }
1497
1498 static int nft_flush(struct nft_ctx *ctx, int family)
1499 {
1500         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1501         const struct nlattr * const *nla = ctx->nla;
1502         struct nft_table *table, *nt;
1503         int err = 0;
1504
1505         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1506                 if (family != AF_UNSPEC && table->family != family)
1507                         continue;
1508
1509                 ctx->family = table->family;
1510
1511                 if (!nft_is_active_next(ctx->net, table))
1512                         continue;
1513
1514                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1515                         continue;
1516
1517                 if (nla[NFTA_TABLE_NAME] &&
1518                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1519                         continue;
1520
1521                 ctx->table = table;
1522
1523                 err = nft_flush_table(ctx);
1524                 if (err < 0)
1525                         goto out;
1526         }
1527 out:
1528         return err;
1529 }
1530
1531 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1532                               const struct nlattr * const nla[])
1533 {
1534         struct netlink_ext_ack *extack = info->extack;
1535         u8 genmask = nft_genmask_next(info->net);
1536         u8 family = info->nfmsg->nfgen_family;
1537         struct net *net = info->net;
1538         const struct nlattr *attr;
1539         struct nft_table *table;
1540         struct nft_ctx ctx;
1541
1542         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1543         if (family == AF_UNSPEC ||
1544             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1545                 return nft_flush(&ctx, family);
1546
1547         if (nla[NFTA_TABLE_HANDLE]) {
1548                 attr = nla[NFTA_TABLE_HANDLE];
1549                 table = nft_table_lookup_byhandle(net, attr, genmask,
1550                                                   NETLINK_CB(skb).portid);
1551         } else {
1552                 attr = nla[NFTA_TABLE_NAME];
1553                 table = nft_table_lookup(net, attr, family, genmask,
1554                                          NETLINK_CB(skb).portid);
1555         }
1556
1557         if (IS_ERR(table)) {
1558                 if (PTR_ERR(table) == -ENOENT &&
1559                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1560                         return 0;
1561
1562                 NL_SET_BAD_ATTR(extack, attr);
1563                 return PTR_ERR(table);
1564         }
1565
1566         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1567             table->use > 0)
1568                 return -EBUSY;
1569
1570         ctx.family = family;
1571         ctx.table = table;
1572
1573         return nft_flush_table(&ctx);
1574 }
1575
1576 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1577 {
1578         if (WARN_ON(ctx->table->use > 0))
1579                 return;
1580
1581         rhltable_destroy(&ctx->table->chains_ht);
1582         kfree(ctx->table->name);
1583         kfree(ctx->table->udata);
1584         kfree(ctx->table);
1585 }
1586
1587 void nft_register_chain_type(const struct nft_chain_type *ctype)
1588 {
1589         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1590         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1591                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1592                 return;
1593         }
1594         chain_type[ctype->family][ctype->type] = ctype;
1595         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1596 }
1597 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1598
1599 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1600 {
1601         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1602         chain_type[ctype->family][ctype->type] = NULL;
1603         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1604 }
1605 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1606
1607 /*
1608  * Chains
1609  */
1610
1611 static struct nft_chain *
1612 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1613 {
1614         struct nft_chain *chain;
1615
1616         list_for_each_entry(chain, &table->chains, list) {
1617                 if (chain->handle == handle &&
1618                     nft_active_genmask(chain, genmask))
1619                         return chain;
1620         }
1621
1622         return ERR_PTR(-ENOENT);
1623 }
1624
1625 static bool lockdep_commit_lock_is_held(const struct net *net)
1626 {
1627 #ifdef CONFIG_PROVE_LOCKING
1628         struct nftables_pernet *nft_net = nft_pernet(net);
1629
1630         return lockdep_is_held(&nft_net->commit_mutex);
1631 #else
1632         return true;
1633 #endif
1634 }
1635
1636 static struct nft_chain *nft_chain_lookup(struct net *net,
1637                                           struct nft_table *table,
1638                                           const struct nlattr *nla, u8 genmask)
1639 {
1640         char search[NFT_CHAIN_MAXNAMELEN + 1];
1641         struct rhlist_head *tmp, *list;
1642         struct nft_chain *chain;
1643
1644         if (nla == NULL)
1645                 return ERR_PTR(-EINVAL);
1646
1647         nla_strscpy(search, nla, sizeof(search));
1648
1649         WARN_ON(!rcu_read_lock_held() &&
1650                 !lockdep_commit_lock_is_held(net));
1651
1652         chain = ERR_PTR(-ENOENT);
1653         rcu_read_lock();
1654         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1655         if (!list)
1656                 goto out_unlock;
1657
1658         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1659                 if (nft_active_genmask(chain, genmask))
1660                         goto out_unlock;
1661         }
1662         chain = ERR_PTR(-ENOENT);
1663 out_unlock:
1664         rcu_read_unlock();
1665         return chain;
1666 }
1667
1668 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1669         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1670                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1671         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1672         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1673                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1674         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1675         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1676         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1677                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1678         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1679         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1680         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1681         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1682                                     .len = NFT_USERDATA_MAXLEN },
1683 };
1684
1685 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1686         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1687         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1688         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1689                                     .len = IFNAMSIZ - 1 },
1690 };
1691
1692 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1693 {
1694         struct nft_stats *cpu_stats, total;
1695         struct nlattr *nest;
1696         unsigned int seq;
1697         u64 pkts, bytes;
1698         int cpu;
1699
1700         if (!stats)
1701                 return 0;
1702
1703         memset(&total, 0, sizeof(total));
1704         for_each_possible_cpu(cpu) {
1705                 cpu_stats = per_cpu_ptr(stats, cpu);
1706                 do {
1707                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1708                         pkts = cpu_stats->pkts;
1709                         bytes = cpu_stats->bytes;
1710                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1711                 total.pkts += pkts;
1712                 total.bytes += bytes;
1713         }
1714         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1715         if (nest == NULL)
1716                 goto nla_put_failure;
1717
1718         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1719                          NFTA_COUNTER_PAD) ||
1720             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1721                          NFTA_COUNTER_PAD))
1722                 goto nla_put_failure;
1723
1724         nla_nest_end(skb, nest);
1725         return 0;
1726
1727 nla_put_failure:
1728         return -ENOSPC;
1729 }
1730
1731 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1732                                    const struct nft_base_chain *basechain,
1733                                    const struct list_head *hook_list)
1734 {
1735         const struct nf_hook_ops *ops = &basechain->ops;
1736         struct nft_hook *hook, *first = NULL;
1737         struct nlattr *nest, *nest_devs;
1738         int n = 0;
1739
1740         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1741         if (nest == NULL)
1742                 goto nla_put_failure;
1743         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1744                 goto nla_put_failure;
1745         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1746                 goto nla_put_failure;
1747
1748         if (nft_base_chain_netdev(family, ops->hooknum)) {
1749                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1750                 if (!nest_devs)
1751                         goto nla_put_failure;
1752
1753                 if (!hook_list)
1754                         hook_list = &basechain->hook_list;
1755
1756                 list_for_each_entry(hook, hook_list, list) {
1757                         if (!first)
1758                                 first = hook;
1759
1760                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1761                                            hook->ops.dev->name))
1762                                 goto nla_put_failure;
1763                         n++;
1764                 }
1765                 nla_nest_end(skb, nest_devs);
1766
1767                 if (n == 1 &&
1768                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1769                         goto nla_put_failure;
1770         }
1771         nla_nest_end(skb, nest);
1772
1773         return 0;
1774 nla_put_failure:
1775         return -1;
1776 }
1777
1778 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1779                                      u32 portid, u32 seq, int event, u32 flags,
1780                                      int family, const struct nft_table *table,
1781                                      const struct nft_chain *chain,
1782                                      const struct list_head *hook_list)
1783 {
1784         struct nlmsghdr *nlh;
1785
1786         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1787         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1788                            NFNETLINK_V0, nft_base_seq(net));
1789         if (!nlh)
1790                 goto nla_put_failure;
1791
1792         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1793             nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1794             nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1795                          NFTA_CHAIN_PAD))
1796                 goto nla_put_failure;
1797
1798         if (event == NFT_MSG_DELCHAIN && !hook_list) {
1799                 nlmsg_end(skb, nlh);
1800                 return 0;
1801         }
1802
1803         if (nft_is_base_chain(chain)) {
1804                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1805                 struct nft_stats __percpu *stats;
1806
1807                 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1808                         goto nla_put_failure;
1809
1810                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1811                                  htonl(basechain->policy)))
1812                         goto nla_put_failure;
1813
1814                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1815                         goto nla_put_failure;
1816
1817                 stats = rcu_dereference_check(basechain->stats,
1818                                               lockdep_commit_lock_is_held(net));
1819                 if (nft_dump_stats(skb, stats))
1820                         goto nla_put_failure;
1821         }
1822
1823         if (chain->flags &&
1824             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1825                 goto nla_put_failure;
1826
1827         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1828                 goto nla_put_failure;
1829
1830         if (chain->udata &&
1831             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1832                 goto nla_put_failure;
1833
1834         nlmsg_end(skb, nlh);
1835         return 0;
1836
1837 nla_put_failure:
1838         nlmsg_trim(skb, nlh);
1839         return -1;
1840 }
1841
1842 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1843                                    const struct list_head *hook_list)
1844 {
1845         struct nftables_pernet *nft_net;
1846         struct sk_buff *skb;
1847         u16 flags = 0;
1848         int err;
1849
1850         if (!ctx->report &&
1851             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1852                 return;
1853
1854         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1855         if (skb == NULL)
1856                 goto err;
1857
1858         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1859                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1860
1861         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1862                                         event, flags, ctx->family, ctx->table,
1863                                         ctx->chain, hook_list);
1864         if (err < 0) {
1865                 kfree_skb(skb);
1866                 goto err;
1867         }
1868
1869         nft_net = nft_pernet(ctx->net);
1870         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1871         return;
1872 err:
1873         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1874 }
1875
1876 static int nf_tables_dump_chains(struct sk_buff *skb,
1877                                  struct netlink_callback *cb)
1878 {
1879         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1880         unsigned int idx = 0, s_idx = cb->args[0];
1881         struct net *net = sock_net(skb->sk);
1882         int family = nfmsg->nfgen_family;
1883         struct nftables_pernet *nft_net;
1884         const struct nft_table *table;
1885         const struct nft_chain *chain;
1886
1887         rcu_read_lock();
1888         nft_net = nft_pernet(net);
1889         cb->seq = READ_ONCE(nft_net->base_seq);
1890
1891         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1892                 if (family != NFPROTO_UNSPEC && family != table->family)
1893                         continue;
1894
1895                 list_for_each_entry_rcu(chain, &table->chains, list) {
1896                         if (idx < s_idx)
1897                                 goto cont;
1898                         if (idx > s_idx)
1899                                 memset(&cb->args[1], 0,
1900                                        sizeof(cb->args) - sizeof(cb->args[0]));
1901                         if (!nft_is_active(net, chain))
1902                                 continue;
1903                         if (nf_tables_fill_chain_info(skb, net,
1904                                                       NETLINK_CB(cb->skb).portid,
1905                                                       cb->nlh->nlmsg_seq,
1906                                                       NFT_MSG_NEWCHAIN,
1907                                                       NLM_F_MULTI,
1908                                                       table->family, table,
1909                                                       chain, NULL) < 0)
1910                                 goto done;
1911
1912                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1913 cont:
1914                         idx++;
1915                 }
1916         }
1917 done:
1918         rcu_read_unlock();
1919         cb->args[0] = idx;
1920         return skb->len;
1921 }
1922
1923 /* called with rcu_read_lock held */
1924 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1925                               const struct nlattr * const nla[])
1926 {
1927         struct netlink_ext_ack *extack = info->extack;
1928         u8 genmask = nft_genmask_cur(info->net);
1929         u8 family = info->nfmsg->nfgen_family;
1930         const struct nft_chain *chain;
1931         struct net *net = info->net;
1932         struct nft_table *table;
1933         struct sk_buff *skb2;
1934         int err;
1935
1936         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1937                 struct netlink_dump_control c = {
1938                         .dump = nf_tables_dump_chains,
1939                         .module = THIS_MODULE,
1940                 };
1941
1942                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1943         }
1944
1945         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1946         if (IS_ERR(table)) {
1947                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1948                 return PTR_ERR(table);
1949         }
1950
1951         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1952         if (IS_ERR(chain)) {
1953                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1954                 return PTR_ERR(chain);
1955         }
1956
1957         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1958         if (!skb2)
1959                 return -ENOMEM;
1960
1961         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1962                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1963                                         0, family, table, chain, NULL);
1964         if (err < 0)
1965                 goto err_fill_chain_info;
1966
1967         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1968
1969 err_fill_chain_info:
1970         kfree_skb(skb2);
1971         return err;
1972 }
1973
1974 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1975         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1976         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1977 };
1978
1979 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1980 {
1981         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1982         struct nft_stats __percpu *newstats;
1983         struct nft_stats *stats;
1984         int err;
1985
1986         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1987                                           nft_counter_policy, NULL);
1988         if (err < 0)
1989                 return ERR_PTR(err);
1990
1991         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1992                 return ERR_PTR(-EINVAL);
1993
1994         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1995         if (newstats == NULL)
1996                 return ERR_PTR(-ENOMEM);
1997
1998         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1999          * are not exposed to userspace.
2000          */
2001         preempt_disable();
2002         stats = this_cpu_ptr(newstats);
2003         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2004         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2005         preempt_enable();
2006
2007         return newstats;
2008 }
2009
2010 static void nft_chain_stats_replace(struct nft_trans *trans)
2011 {
2012         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2013
2014         if (!nft_trans_chain_stats(trans))
2015                 return;
2016
2017         nft_trans_chain_stats(trans) =
2018                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2019                                     lockdep_commit_lock_is_held(trans->ctx.net));
2020
2021         if (!nft_trans_chain_stats(trans))
2022                 static_branch_inc(&nft_counters_enabled);
2023 }
2024
2025 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2026 {
2027         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2028         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2029
2030         if (g0 != g1)
2031                 kvfree(g1);
2032         kvfree(g0);
2033
2034         /* should be NULL either via abort or via successful commit */
2035         WARN_ON_ONCE(chain->blob_next);
2036         kvfree(chain->blob_next);
2037 }
2038
2039 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2040 {
2041         struct nft_chain *chain = ctx->chain;
2042         struct nft_hook *hook, *next;
2043
2044         if (WARN_ON(chain->use > 0))
2045                 return;
2046
2047         /* no concurrent access possible anymore */
2048         nf_tables_chain_free_chain_rules(chain);
2049
2050         if (nft_is_base_chain(chain)) {
2051                 struct nft_base_chain *basechain = nft_base_chain(chain);
2052
2053                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2054                         list_for_each_entry_safe(hook, next,
2055                                                  &basechain->hook_list, list) {
2056                                 list_del_rcu(&hook->list);
2057                                 kfree_rcu(hook, rcu);
2058                         }
2059                 }
2060                 module_put(basechain->type->owner);
2061                 if (rcu_access_pointer(basechain->stats)) {
2062                         static_branch_dec(&nft_counters_enabled);
2063                         free_percpu(rcu_dereference_raw(basechain->stats));
2064                 }
2065                 kfree(chain->name);
2066                 kfree(chain->udata);
2067                 kfree(basechain);
2068         } else {
2069                 kfree(chain->name);
2070                 kfree(chain->udata);
2071                 kfree(chain);
2072         }
2073 }
2074
2075 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2076                                               const struct nlattr *attr)
2077 {
2078         struct net_device *dev;
2079         char ifname[IFNAMSIZ];
2080         struct nft_hook *hook;
2081         int err;
2082
2083         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2084         if (!hook) {
2085                 err = -ENOMEM;
2086                 goto err_hook_alloc;
2087         }
2088
2089         nla_strscpy(ifname, attr, IFNAMSIZ);
2090         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2091          * indirectly serializing all the other holders of the commit_mutex with
2092          * the rtnl_mutex.
2093          */
2094         dev = __dev_get_by_name(net, ifname);
2095         if (!dev) {
2096                 err = -ENOENT;
2097                 goto err_hook_dev;
2098         }
2099         hook->ops.dev = dev;
2100
2101         return hook;
2102
2103 err_hook_dev:
2104         kfree(hook);
2105 err_hook_alloc:
2106         return ERR_PTR(err);
2107 }
2108
2109 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2110                                            const struct nft_hook *this)
2111 {
2112         struct nft_hook *hook;
2113
2114         list_for_each_entry(hook, hook_list, list) {
2115                 if (this->ops.dev == hook->ops.dev)
2116                         return hook;
2117         }
2118
2119         return NULL;
2120 }
2121
2122 static int nf_tables_parse_netdev_hooks(struct net *net,
2123                                         const struct nlattr *attr,
2124                                         struct list_head *hook_list,
2125                                         struct netlink_ext_ack *extack)
2126 {
2127         struct nft_hook *hook, *next;
2128         const struct nlattr *tmp;
2129         int rem, n = 0, err;
2130
2131         nla_for_each_nested(tmp, attr, rem) {
2132                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2133                         err = -EINVAL;
2134                         goto err_hook;
2135                 }
2136
2137                 hook = nft_netdev_hook_alloc(net, tmp);
2138                 if (IS_ERR(hook)) {
2139                         NL_SET_BAD_ATTR(extack, tmp);
2140                         err = PTR_ERR(hook);
2141                         goto err_hook;
2142                 }
2143                 if (nft_hook_list_find(hook_list, hook)) {
2144                         NL_SET_BAD_ATTR(extack, tmp);
2145                         kfree(hook);
2146                         err = -EEXIST;
2147                         goto err_hook;
2148                 }
2149                 list_add_tail(&hook->list, hook_list);
2150                 n++;
2151
2152                 if (n == NFT_NETDEVICE_MAX) {
2153                         err = -EFBIG;
2154                         goto err_hook;
2155                 }
2156         }
2157
2158         return 0;
2159
2160 err_hook:
2161         list_for_each_entry_safe(hook, next, hook_list, list) {
2162                 list_del(&hook->list);
2163                 kfree(hook);
2164         }
2165         return err;
2166 }
2167
2168 struct nft_chain_hook {
2169         u32                             num;
2170         s32                             priority;
2171         const struct nft_chain_type     *type;
2172         struct list_head                list;
2173 };
2174
2175 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2176                                   struct list_head *hook_list,
2177                                   struct netlink_ext_ack *extack, u32 flags)
2178 {
2179         struct nft_hook *hook;
2180         int err;
2181
2182         if (tb[NFTA_HOOK_DEV]) {
2183                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2184                 if (IS_ERR(hook)) {
2185                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2186                         return PTR_ERR(hook);
2187                 }
2188
2189                 list_add_tail(&hook->list, hook_list);
2190         } else if (tb[NFTA_HOOK_DEVS]) {
2191                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2192                                                    hook_list, extack);
2193                 if (err < 0)
2194                         return err;
2195
2196         }
2197
2198         if (flags & NFT_CHAIN_HW_OFFLOAD &&
2199             list_empty(hook_list))
2200                 return -EINVAL;
2201
2202         return 0;
2203 }
2204
2205 static int nft_chain_parse_hook(struct net *net,
2206                                 struct nft_base_chain *basechain,
2207                                 const struct nlattr * const nla[],
2208                                 struct nft_chain_hook *hook, u8 family,
2209                                 u32 flags, struct netlink_ext_ack *extack)
2210 {
2211         struct nftables_pernet *nft_net = nft_pernet(net);
2212         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2213         const struct nft_chain_type *type;
2214         int err;
2215
2216         lockdep_assert_held(&nft_net->commit_mutex);
2217         lockdep_nfnl_nft_mutex_not_held();
2218
2219         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2220                                           nla[NFTA_CHAIN_HOOK],
2221                                           nft_hook_policy, NULL);
2222         if (err < 0)
2223                 return err;
2224
2225         if (!basechain) {
2226                 if (!ha[NFTA_HOOK_HOOKNUM] ||
2227                     !ha[NFTA_HOOK_PRIORITY]) {
2228                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2229                         return -ENOENT;
2230                 }
2231
2232                 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2233                 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2234
2235                 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2236                 if (!type)
2237                         return -EOPNOTSUPP;
2238
2239                 if (nla[NFTA_CHAIN_TYPE]) {
2240                         type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2241                                                            family, true);
2242                         if (IS_ERR(type)) {
2243                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2244                                 return PTR_ERR(type);
2245                         }
2246                 }
2247                 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2248                         return -EOPNOTSUPP;
2249
2250                 if (type->type == NFT_CHAIN_T_NAT &&
2251                     hook->priority <= NF_IP_PRI_CONNTRACK)
2252                         return -EOPNOTSUPP;
2253         } else {
2254                 if (ha[NFTA_HOOK_HOOKNUM]) {
2255                         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2256                         if (hook->num != basechain->ops.hooknum)
2257                                 return -EOPNOTSUPP;
2258                 }
2259                 if (ha[NFTA_HOOK_PRIORITY]) {
2260                         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2261                         if (hook->priority != basechain->ops.priority)
2262                                 return -EOPNOTSUPP;
2263                 }
2264
2265                 type = basechain->type;
2266         }
2267
2268         if (!try_module_get(type->owner)) {
2269                 if (nla[NFTA_CHAIN_TYPE])
2270                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2271                 return -ENOENT;
2272         }
2273
2274         hook->type = type;
2275
2276         INIT_LIST_HEAD(&hook->list);
2277         if (nft_base_chain_netdev(family, hook->num)) {
2278                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2279                 if (err < 0) {
2280                         module_put(type->owner);
2281                         return err;
2282                 }
2283         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2284                 module_put(type->owner);
2285                 return -EOPNOTSUPP;
2286         }
2287
2288         return 0;
2289 }
2290
2291 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2292 {
2293         struct nft_hook *h, *next;
2294
2295         list_for_each_entry_safe(h, next, &hook->list, list) {
2296                 list_del(&h->list);
2297                 kfree(h);
2298         }
2299         module_put(hook->type->owner);
2300 }
2301
2302 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2303 {
2304         struct nft_rule_dp_last *lrule;
2305
2306         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2307
2308         lrule = (struct nft_rule_dp_last *)ptr;
2309         lrule->end.is_last = 1;
2310         lrule->chain = chain;
2311         /* blob size does not include the trailer rule */
2312 }
2313
2314 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2315                                                          unsigned int size)
2316 {
2317         struct nft_rule_blob *blob;
2318
2319         if (size > INT_MAX)
2320                 return NULL;
2321
2322         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2323
2324         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2325         if (!blob)
2326                 return NULL;
2327
2328         blob->size = 0;
2329         nft_last_rule(chain, blob->data);
2330
2331         return blob;
2332 }
2333
2334 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2335                                     const struct nft_chain_hook *hook,
2336                                     struct nft_chain *chain)
2337 {
2338         ops->pf                 = family;
2339         ops->hooknum            = hook->num;
2340         ops->priority           = hook->priority;
2341         ops->priv               = chain;
2342         ops->hook               = hook->type->hooks[ops->hooknum];
2343         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2344 }
2345
2346 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2347                               struct nft_chain_hook *hook, u32 flags)
2348 {
2349         struct nft_chain *chain;
2350         struct nft_hook *h;
2351
2352         basechain->type = hook->type;
2353         INIT_LIST_HEAD(&basechain->hook_list);
2354         chain = &basechain->chain;
2355
2356         if (nft_base_chain_netdev(family, hook->num)) {
2357                 list_splice_init(&hook->list, &basechain->hook_list);
2358                 list_for_each_entry(h, &basechain->hook_list, list)
2359                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2360         }
2361         nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2362
2363         chain->flags |= NFT_CHAIN_BASE | flags;
2364         basechain->policy = NF_ACCEPT;
2365         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2366             !nft_chain_offload_support(basechain)) {
2367                 list_splice_init(&basechain->hook_list, &hook->list);
2368                 return -EOPNOTSUPP;
2369         }
2370
2371         flow_block_init(&basechain->flow_block);
2372
2373         return 0;
2374 }
2375
2376 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2377 {
2378         int err;
2379
2380         err = rhltable_insert_key(&table->chains_ht, chain->name,
2381                                   &chain->rhlhead, nft_chain_ht_params);
2382         if (err)
2383                 return err;
2384
2385         list_add_tail_rcu(&chain->list, &table->chains);
2386
2387         return 0;
2388 }
2389
2390 static u64 chain_id;
2391
2392 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2393                               u8 policy, u32 flags,
2394                               struct netlink_ext_ack *extack)
2395 {
2396         const struct nlattr * const *nla = ctx->nla;
2397         struct nft_table *table = ctx->table;
2398         struct nft_base_chain *basechain;
2399         struct net *net = ctx->net;
2400         char name[NFT_NAME_MAXLEN];
2401         struct nft_rule_blob *blob;
2402         struct nft_trans *trans;
2403         struct nft_chain *chain;
2404         int err;
2405
2406         if (nla[NFTA_CHAIN_HOOK]) {
2407                 struct nft_stats __percpu *stats = NULL;
2408                 struct nft_chain_hook hook = {};
2409
2410                 if (flags & NFT_CHAIN_BINDING)
2411                         return -EOPNOTSUPP;
2412
2413                 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2414                                            extack);
2415                 if (err < 0)
2416                         return err;
2417
2418                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2419                 if (basechain == NULL) {
2420                         nft_chain_release_hook(&hook);
2421                         return -ENOMEM;
2422                 }
2423                 chain = &basechain->chain;
2424
2425                 if (nla[NFTA_CHAIN_COUNTERS]) {
2426                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2427                         if (IS_ERR(stats)) {
2428                                 nft_chain_release_hook(&hook);
2429                                 kfree(basechain);
2430                                 return PTR_ERR(stats);
2431                         }
2432                         rcu_assign_pointer(basechain->stats, stats);
2433                 }
2434
2435                 err = nft_basechain_init(basechain, family, &hook, flags);
2436                 if (err < 0) {
2437                         nft_chain_release_hook(&hook);
2438                         kfree(basechain);
2439                         free_percpu(stats);
2440                         return err;
2441                 }
2442                 if (stats)
2443                         static_branch_inc(&nft_counters_enabled);
2444         } else {
2445                 if (flags & NFT_CHAIN_BASE)
2446                         return -EINVAL;
2447                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2448                         return -EOPNOTSUPP;
2449
2450                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2451                 if (chain == NULL)
2452                         return -ENOMEM;
2453
2454                 chain->flags = flags;
2455         }
2456         ctx->chain = chain;
2457
2458         INIT_LIST_HEAD(&chain->rules);
2459         chain->handle = nf_tables_alloc_handle(table);
2460         chain->table = table;
2461
2462         if (nla[NFTA_CHAIN_NAME]) {
2463                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2464         } else {
2465                 if (!(flags & NFT_CHAIN_BINDING)) {
2466                         err = -EINVAL;
2467                         goto err_destroy_chain;
2468                 }
2469
2470                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2471                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2472         }
2473
2474         if (!chain->name) {
2475                 err = -ENOMEM;
2476                 goto err_destroy_chain;
2477         }
2478
2479         if (nla[NFTA_CHAIN_USERDATA]) {
2480                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2481                 if (chain->udata == NULL) {
2482                         err = -ENOMEM;
2483                         goto err_destroy_chain;
2484                 }
2485                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2486         }
2487
2488         blob = nf_tables_chain_alloc_rules(chain, 0);
2489         if (!blob) {
2490                 err = -ENOMEM;
2491                 goto err_destroy_chain;
2492         }
2493
2494         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2495         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2496
2497         err = nf_tables_register_hook(net, table, chain);
2498         if (err < 0)
2499                 goto err_destroy_chain;
2500
2501         if (!nft_use_inc(&table->use)) {
2502                 err = -EMFILE;
2503                 goto err_use;
2504         }
2505
2506         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2507         if (IS_ERR(trans)) {
2508                 err = PTR_ERR(trans);
2509                 goto err_unregister_hook;
2510         }
2511
2512         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2513         if (nft_is_base_chain(chain))
2514                 nft_trans_chain_policy(trans) = policy;
2515
2516         err = nft_chain_add(table, chain);
2517         if (err < 0) {
2518                 nft_trans_destroy(trans);
2519                 goto err_unregister_hook;
2520         }
2521
2522         return 0;
2523
2524 err_unregister_hook:
2525         nft_use_dec_restore(&table->use);
2526 err_use:
2527         nf_tables_unregister_hook(net, table, chain);
2528 err_destroy_chain:
2529         nf_tables_chain_destroy(ctx);
2530
2531         return err;
2532 }
2533
2534 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2535                               u32 flags, const struct nlattr *attr,
2536                               struct netlink_ext_ack *extack)
2537 {
2538         const struct nlattr * const *nla = ctx->nla;
2539         struct nft_base_chain *basechain = NULL;
2540         struct nft_table *table = ctx->table;
2541         struct nft_chain *chain = ctx->chain;
2542         struct nft_chain_hook hook = {};
2543         struct nft_stats *stats = NULL;
2544         struct nft_hook *h, *next;
2545         struct nf_hook_ops *ops;
2546         struct nft_trans *trans;
2547         bool unregister = false;
2548         int err;
2549
2550         if (chain->flags ^ flags)
2551                 return -EOPNOTSUPP;
2552
2553         INIT_LIST_HEAD(&hook.list);
2554
2555         if (nla[NFTA_CHAIN_HOOK]) {
2556                 if (!nft_is_base_chain(chain)) {
2557                         NL_SET_BAD_ATTR(extack, attr);
2558                         return -EEXIST;
2559                 }
2560
2561                 basechain = nft_base_chain(chain);
2562                 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2563                                            ctx->family, flags, extack);
2564                 if (err < 0)
2565                         return err;
2566
2567                 if (basechain->type != hook.type) {
2568                         nft_chain_release_hook(&hook);
2569                         NL_SET_BAD_ATTR(extack, attr);
2570                         return -EEXIST;
2571                 }
2572
2573                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2574                         list_for_each_entry_safe(h, next, &hook.list, list) {
2575                                 h->ops.pf       = basechain->ops.pf;
2576                                 h->ops.hooknum  = basechain->ops.hooknum;
2577                                 h->ops.priority = basechain->ops.priority;
2578                                 h->ops.priv     = basechain->ops.priv;
2579                                 h->ops.hook     = basechain->ops.hook;
2580
2581                                 if (nft_hook_list_find(&basechain->hook_list, h)) {
2582                                         list_del(&h->list);
2583                                         kfree(h);
2584                                 }
2585                         }
2586                 } else {
2587                         ops = &basechain->ops;
2588                         if (ops->hooknum != hook.num ||
2589                             ops->priority != hook.priority) {
2590                                 nft_chain_release_hook(&hook);
2591                                 NL_SET_BAD_ATTR(extack, attr);
2592                                 return -EEXIST;
2593                         }
2594                 }
2595         }
2596
2597         if (nla[NFTA_CHAIN_HANDLE] &&
2598             nla[NFTA_CHAIN_NAME]) {
2599                 struct nft_chain *chain2;
2600
2601                 chain2 = nft_chain_lookup(ctx->net, table,
2602                                           nla[NFTA_CHAIN_NAME], genmask);
2603                 if (!IS_ERR(chain2)) {
2604                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2605                         err = -EEXIST;
2606                         goto err_hooks;
2607                 }
2608         }
2609
2610         if (nla[NFTA_CHAIN_COUNTERS]) {
2611                 if (!nft_is_base_chain(chain)) {
2612                         err = -EOPNOTSUPP;
2613                         goto err_hooks;
2614                 }
2615
2616                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2617                 if (IS_ERR(stats)) {
2618                         err = PTR_ERR(stats);
2619                         goto err_hooks;
2620                 }
2621         }
2622
2623         if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2624             nft_is_base_chain(chain) &&
2625             !list_empty(&hook.list)) {
2626                 basechain = nft_base_chain(chain);
2627                 ops = &basechain->ops;
2628
2629                 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2630                         err = nft_netdev_register_hooks(ctx->net, &hook.list);
2631                         if (err < 0)
2632                                 goto err_hooks;
2633                 }
2634         }
2635
2636         unregister = true;
2637         err = -ENOMEM;
2638         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2639                                 sizeof(struct nft_trans_chain));
2640         if (trans == NULL)
2641                 goto err_trans;
2642
2643         nft_trans_chain_stats(trans) = stats;
2644         nft_trans_chain_update(trans) = true;
2645
2646         if (nla[NFTA_CHAIN_POLICY])
2647                 nft_trans_chain_policy(trans) = policy;
2648         else
2649                 nft_trans_chain_policy(trans) = -1;
2650
2651         if (nla[NFTA_CHAIN_HANDLE] &&
2652             nla[NFTA_CHAIN_NAME]) {
2653                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2654                 struct nft_trans *tmp;
2655                 char *name;
2656
2657                 err = -ENOMEM;
2658                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2659                 if (!name)
2660                         goto err_trans;
2661
2662                 err = -EEXIST;
2663                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2664                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2665                             tmp->ctx.table == table &&
2666                             nft_trans_chain_update(tmp) &&
2667                             nft_trans_chain_name(tmp) &&
2668                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2669                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2670                                 kfree(name);
2671                                 goto err_trans;
2672                         }
2673                 }
2674
2675                 nft_trans_chain_name(trans) = name;
2676         }
2677
2678         nft_trans_basechain(trans) = basechain;
2679         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2680         list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2681         if (nla[NFTA_CHAIN_HOOK])
2682                 module_put(hook.type->owner);
2683
2684         nft_trans_commit_list_add_tail(ctx->net, trans);
2685
2686         return 0;
2687
2688 err_trans:
2689         free_percpu(stats);
2690         kfree(trans);
2691 err_hooks:
2692         if (nla[NFTA_CHAIN_HOOK]) {
2693                 list_for_each_entry_safe(h, next, &hook.list, list) {
2694                         if (unregister)
2695                                 nf_unregister_net_hook(ctx->net, &h->ops);
2696                         list_del(&h->list);
2697                         kfree_rcu(h, rcu);
2698                 }
2699                 module_put(hook.type->owner);
2700         }
2701
2702         return err;
2703 }
2704
2705 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2706                                                const struct nft_table *table,
2707                                                const struct nlattr *nla, u8 genmask)
2708 {
2709         struct nftables_pernet *nft_net = nft_pernet(net);
2710         u32 id = ntohl(nla_get_be32(nla));
2711         struct nft_trans *trans;
2712
2713         list_for_each_entry(trans, &nft_net->commit_list, list) {
2714                 struct nft_chain *chain = trans->ctx.chain;
2715
2716                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2717                     chain->table == table &&
2718                     id == nft_trans_chain_id(trans) &&
2719                     nft_active_genmask(chain, genmask))
2720                         return chain;
2721         }
2722         return ERR_PTR(-ENOENT);
2723 }
2724
2725 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2726                               const struct nlattr * const nla[])
2727 {
2728         struct nftables_pernet *nft_net = nft_pernet(info->net);
2729         struct netlink_ext_ack *extack = info->extack;
2730         u8 genmask = nft_genmask_next(info->net);
2731         u8 family = info->nfmsg->nfgen_family;
2732         struct nft_chain *chain = NULL;
2733         struct net *net = info->net;
2734         const struct nlattr *attr;
2735         struct nft_table *table;
2736         u8 policy = NF_ACCEPT;
2737         struct nft_ctx ctx;
2738         u64 handle = 0;
2739         u32 flags = 0;
2740
2741         lockdep_assert_held(&nft_net->commit_mutex);
2742
2743         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2744                                  NETLINK_CB(skb).portid);
2745         if (IS_ERR(table)) {
2746                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2747                 return PTR_ERR(table);
2748         }
2749
2750         chain = NULL;
2751         attr = nla[NFTA_CHAIN_NAME];
2752
2753         if (nla[NFTA_CHAIN_HANDLE]) {
2754                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2755                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2756                 if (IS_ERR(chain)) {
2757                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2758                         return PTR_ERR(chain);
2759                 }
2760                 attr = nla[NFTA_CHAIN_HANDLE];
2761         } else if (nla[NFTA_CHAIN_NAME]) {
2762                 chain = nft_chain_lookup(net, table, attr, genmask);
2763                 if (IS_ERR(chain)) {
2764                         if (PTR_ERR(chain) != -ENOENT) {
2765                                 NL_SET_BAD_ATTR(extack, attr);
2766                                 return PTR_ERR(chain);
2767                         }
2768                         chain = NULL;
2769                 }
2770         } else if (!nla[NFTA_CHAIN_ID]) {
2771                 return -EINVAL;
2772         }
2773
2774         if (nla[NFTA_CHAIN_POLICY]) {
2775                 if (chain != NULL &&
2776                     !nft_is_base_chain(chain)) {
2777                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2778                         return -EOPNOTSUPP;
2779                 }
2780
2781                 if (chain == NULL &&
2782                     nla[NFTA_CHAIN_HOOK] == NULL) {
2783                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2784                         return -EOPNOTSUPP;
2785                 }
2786
2787                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2788                 switch (policy) {
2789                 case NF_DROP:
2790                 case NF_ACCEPT:
2791                         break;
2792                 default:
2793                         return -EINVAL;
2794                 }
2795         }
2796
2797         if (nla[NFTA_CHAIN_FLAGS])
2798                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2799         else if (chain)
2800                 flags = chain->flags;
2801
2802         if (flags & ~NFT_CHAIN_FLAGS)
2803                 return -EOPNOTSUPP;
2804
2805         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2806
2807         if (chain != NULL) {
2808                 if (chain->flags & NFT_CHAIN_BINDING)
2809                         return -EINVAL;
2810
2811                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2812                         NL_SET_BAD_ATTR(extack, attr);
2813                         return -EEXIST;
2814                 }
2815                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2816                         return -EOPNOTSUPP;
2817
2818                 flags |= chain->flags & NFT_CHAIN_BASE;
2819                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2820                                           extack);
2821         }
2822
2823         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2824 }
2825
2826 static int nft_delchain_hook(struct nft_ctx *ctx,
2827                              struct nft_base_chain *basechain,
2828                              struct netlink_ext_ack *extack)
2829 {
2830         const struct nft_chain *chain = &basechain->chain;
2831         const struct nlattr * const *nla = ctx->nla;
2832         struct nft_chain_hook chain_hook = {};
2833         struct nft_hook *this, *hook;
2834         LIST_HEAD(chain_del_list);
2835         struct nft_trans *trans;
2836         int err;
2837
2838         err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2839                                    ctx->family, chain->flags, extack);
2840         if (err < 0)
2841                 return err;
2842
2843         list_for_each_entry(this, &chain_hook.list, list) {
2844                 hook = nft_hook_list_find(&basechain->hook_list, this);
2845                 if (!hook) {
2846                         err = -ENOENT;
2847                         goto err_chain_del_hook;
2848                 }
2849                 list_move(&hook->list, &chain_del_list);
2850         }
2851
2852         trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2853                                 sizeof(struct nft_trans_chain));
2854         if (!trans) {
2855                 err = -ENOMEM;
2856                 goto err_chain_del_hook;
2857         }
2858
2859         nft_trans_basechain(trans) = basechain;
2860         nft_trans_chain_update(trans) = true;
2861         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2862         list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2863         nft_chain_release_hook(&chain_hook);
2864
2865         nft_trans_commit_list_add_tail(ctx->net, trans);
2866
2867         return 0;
2868
2869 err_chain_del_hook:
2870         list_splice(&chain_del_list, &basechain->hook_list);
2871         nft_chain_release_hook(&chain_hook);
2872
2873         return err;
2874 }
2875
2876 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2877                               const struct nlattr * const nla[])
2878 {
2879         struct netlink_ext_ack *extack = info->extack;
2880         u8 genmask = nft_genmask_next(info->net);
2881         u8 family = info->nfmsg->nfgen_family;
2882         struct net *net = info->net;
2883         const struct nlattr *attr;
2884         struct nft_table *table;
2885         struct nft_chain *chain;
2886         struct nft_rule *rule;
2887         struct nft_ctx ctx;
2888         u64 handle;
2889         u32 use;
2890         int err;
2891
2892         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2893                                  NETLINK_CB(skb).portid);
2894         if (IS_ERR(table)) {
2895                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2896                 return PTR_ERR(table);
2897         }
2898
2899         if (nla[NFTA_CHAIN_HANDLE]) {
2900                 attr = nla[NFTA_CHAIN_HANDLE];
2901                 handle = be64_to_cpu(nla_get_be64(attr));
2902                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2903         } else {
2904                 attr = nla[NFTA_CHAIN_NAME];
2905                 chain = nft_chain_lookup(net, table, attr, genmask);
2906         }
2907         if (IS_ERR(chain)) {
2908                 if (PTR_ERR(chain) == -ENOENT &&
2909                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2910                         return 0;
2911
2912                 NL_SET_BAD_ATTR(extack, attr);
2913                 return PTR_ERR(chain);
2914         }
2915
2916         if (nft_chain_binding(chain))
2917                 return -EOPNOTSUPP;
2918
2919         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2920
2921         if (nla[NFTA_CHAIN_HOOK]) {
2922                 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2923                         return -EOPNOTSUPP;
2924
2925                 if (nft_is_base_chain(chain)) {
2926                         struct nft_base_chain *basechain = nft_base_chain(chain);
2927
2928                         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2929                                 return nft_delchain_hook(&ctx, basechain, extack);
2930                 }
2931         }
2932
2933         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2934             chain->use > 0)
2935                 return -EBUSY;
2936
2937         use = chain->use;
2938         list_for_each_entry(rule, &chain->rules, list) {
2939                 if (!nft_is_active_next(net, rule))
2940                         continue;
2941                 use--;
2942
2943                 err = nft_delrule(&ctx, rule);
2944                 if (err < 0)
2945                         return err;
2946         }
2947
2948         /* There are rules and elements that are still holding references to us,
2949          * we cannot do a recursive removal in this case.
2950          */
2951         if (use > 0) {
2952                 NL_SET_BAD_ATTR(extack, attr);
2953                 return -EBUSY;
2954         }
2955
2956         return nft_delchain(&ctx);
2957 }
2958
2959 /*
2960  * Expressions
2961  */
2962
2963 /**
2964  *      nft_register_expr - register nf_tables expr type
2965  *      @type: expr type
2966  *
2967  *      Registers the expr type for use with nf_tables. Returns zero on
2968  *      success or a negative errno code otherwise.
2969  */
2970 int nft_register_expr(struct nft_expr_type *type)
2971 {
2972         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2973         if (type->family == NFPROTO_UNSPEC)
2974                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2975         else
2976                 list_add_rcu(&type->list, &nf_tables_expressions);
2977         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2978         return 0;
2979 }
2980 EXPORT_SYMBOL_GPL(nft_register_expr);
2981
2982 /**
2983  *      nft_unregister_expr - unregister nf_tables expr type
2984  *      @type: expr type
2985  *
2986  *      Unregisters the expr typefor use with nf_tables.
2987  */
2988 void nft_unregister_expr(struct nft_expr_type *type)
2989 {
2990         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2991         list_del_rcu(&type->list);
2992         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2993 }
2994 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2995
2996 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2997                                                        struct nlattr *nla)
2998 {
2999         const struct nft_expr_type *type, *candidate = NULL;
3000
3001         list_for_each_entry(type, &nf_tables_expressions, list) {
3002                 if (!nla_strcmp(nla, type->name)) {
3003                         if (!type->family && !candidate)
3004                                 candidate = type;
3005                         else if (type->family == family)
3006                                 candidate = type;
3007                 }
3008         }
3009         return candidate;
3010 }
3011
3012 #ifdef CONFIG_MODULES
3013 static int nft_expr_type_request_module(struct net *net, u8 family,
3014                                         struct nlattr *nla)
3015 {
3016         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3017                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3018                 return -EAGAIN;
3019
3020         return 0;
3021 }
3022 #endif
3023
3024 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3025                                                      u8 family,
3026                                                      struct nlattr *nla)
3027 {
3028         const struct nft_expr_type *type;
3029
3030         if (nla == NULL)
3031                 return ERR_PTR(-EINVAL);
3032
3033         type = __nft_expr_type_get(family, nla);
3034         if (type != NULL && try_module_get(type->owner))
3035                 return type;
3036
3037         lockdep_nfnl_nft_mutex_not_held();
3038 #ifdef CONFIG_MODULES
3039         if (type == NULL) {
3040                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3041                         return ERR_PTR(-EAGAIN);
3042
3043                 if (nft_request_module(net, "nft-expr-%.*s",
3044                                        nla_len(nla),
3045                                        (char *)nla_data(nla)) == -EAGAIN)
3046                         return ERR_PTR(-EAGAIN);
3047         }
3048 #endif
3049         return ERR_PTR(-ENOENT);
3050 }
3051
3052 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3053         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
3054                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
3055         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
3056 };
3057
3058 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3059                                     const struct nft_expr *expr, bool reset)
3060 {
3061         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3062                 goto nla_put_failure;
3063
3064         if (expr->ops->dump) {
3065                 struct nlattr *data = nla_nest_start_noflag(skb,
3066                                                             NFTA_EXPR_DATA);
3067                 if (data == NULL)
3068                         goto nla_put_failure;
3069                 if (expr->ops->dump(skb, expr, reset) < 0)
3070                         goto nla_put_failure;
3071                 nla_nest_end(skb, data);
3072         }
3073
3074         return skb->len;
3075
3076 nla_put_failure:
3077         return -1;
3078 };
3079
3080 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3081                   const struct nft_expr *expr, bool reset)
3082 {
3083         struct nlattr *nest;
3084
3085         nest = nla_nest_start_noflag(skb, attr);
3086         if (!nest)
3087                 goto nla_put_failure;
3088         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3089                 goto nla_put_failure;
3090         nla_nest_end(skb, nest);
3091         return 0;
3092
3093 nla_put_failure:
3094         return -1;
3095 }
3096
3097 struct nft_expr_info {
3098         const struct nft_expr_ops       *ops;
3099         const struct nlattr             *attr;
3100         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
3101 };
3102
3103 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3104                                 const struct nlattr *nla,
3105                                 struct nft_expr_info *info)
3106 {
3107         const struct nft_expr_type *type;
3108         const struct nft_expr_ops *ops;
3109         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3110         int err;
3111
3112         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3113                                           nft_expr_policy, NULL);
3114         if (err < 0)
3115                 return err;
3116
3117         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3118         if (IS_ERR(type))
3119                 return PTR_ERR(type);
3120
3121         if (tb[NFTA_EXPR_DATA]) {
3122                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3123                                                   tb[NFTA_EXPR_DATA],
3124                                                   type->policy, NULL);
3125                 if (err < 0)
3126                         goto err1;
3127         } else
3128                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3129
3130         if (type->select_ops != NULL) {
3131                 ops = type->select_ops(ctx,
3132                                        (const struct nlattr * const *)info->tb);
3133                 if (IS_ERR(ops)) {
3134                         err = PTR_ERR(ops);
3135 #ifdef CONFIG_MODULES
3136                         if (err == -EAGAIN)
3137                                 if (nft_expr_type_request_module(ctx->net,
3138                                                                  ctx->family,
3139                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
3140                                         err = -ENOENT;
3141 #endif
3142                         goto err1;
3143                 }
3144         } else
3145                 ops = type->ops;
3146
3147         info->attr = nla;
3148         info->ops = ops;
3149
3150         return 0;
3151
3152 err1:
3153         module_put(type->owner);
3154         return err;
3155 }
3156
3157 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3158                          struct nft_expr_info *info)
3159 {
3160         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3161         const struct nft_expr_type *type;
3162         int err;
3163
3164         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3165                                           nft_expr_policy, NULL);
3166         if (err < 0)
3167                 return err;
3168
3169         if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3170                 return -EINVAL;
3171
3172         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3173         if (!type)
3174                 return -ENOENT;
3175
3176         if (!type->inner_ops)
3177                 return -EOPNOTSUPP;
3178
3179         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3180                                           tb[NFTA_EXPR_DATA],
3181                                           type->policy, NULL);
3182         if (err < 0)
3183                 goto err_nla_parse;
3184
3185         info->attr = nla;
3186         info->ops = type->inner_ops;
3187
3188         return 0;
3189
3190 err_nla_parse:
3191         return err;
3192 }
3193
3194 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3195                              const struct nft_expr_info *expr_info,
3196                              struct nft_expr *expr)
3197 {
3198         const struct nft_expr_ops *ops = expr_info->ops;
3199         int err;
3200
3201         expr->ops = ops;
3202         if (ops->init) {
3203                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3204                 if (err < 0)
3205                         goto err1;
3206         }
3207
3208         return 0;
3209 err1:
3210         expr->ops = NULL;
3211         return err;
3212 }
3213
3214 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3215                                    struct nft_expr *expr)
3216 {
3217         const struct nft_expr_type *type = expr->ops->type;
3218
3219         if (expr->ops->destroy)
3220                 expr->ops->destroy(ctx, expr);
3221         module_put(type->owner);
3222 }
3223
3224 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3225                                       const struct nlattr *nla)
3226 {
3227         struct nft_expr_info expr_info;
3228         struct nft_expr *expr;
3229         struct module *owner;
3230         int err;
3231
3232         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3233         if (err < 0)
3234                 goto err_expr_parse;
3235
3236         err = -EOPNOTSUPP;
3237         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3238                 goto err_expr_stateful;
3239
3240         err = -ENOMEM;
3241         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3242         if (expr == NULL)
3243                 goto err_expr_stateful;
3244
3245         err = nf_tables_newexpr(ctx, &expr_info, expr);
3246         if (err < 0)
3247                 goto err_expr_new;
3248
3249         return expr;
3250 err_expr_new:
3251         kfree(expr);
3252 err_expr_stateful:
3253         owner = expr_info.ops->type->owner;
3254         if (expr_info.ops->type->release_ops)
3255                 expr_info.ops->type->release_ops(expr_info.ops);
3256
3257         module_put(owner);
3258 err_expr_parse:
3259         return ERR_PTR(err);
3260 }
3261
3262 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3263 {
3264         int err;
3265
3266         if (src->ops->clone) {
3267                 dst->ops = src->ops;
3268                 err = src->ops->clone(dst, src);
3269                 if (err < 0)
3270                         return err;
3271         } else {
3272                 memcpy(dst, src, src->ops->size);
3273         }
3274
3275         __module_get(src->ops->type->owner);
3276
3277         return 0;
3278 }
3279
3280 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3281 {
3282         nf_tables_expr_destroy(ctx, expr);
3283         kfree(expr);
3284 }
3285
3286 /*
3287  * Rules
3288  */
3289
3290 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3291                                           u64 handle)
3292 {
3293         struct nft_rule *rule;
3294
3295         // FIXME: this sucks
3296         list_for_each_entry_rcu(rule, &chain->rules, list) {
3297                 if (handle == rule->handle)
3298                         return rule;
3299         }
3300
3301         return ERR_PTR(-ENOENT);
3302 }
3303
3304 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3305                                         const struct nlattr *nla)
3306 {
3307         if (nla == NULL)
3308                 return ERR_PTR(-EINVAL);
3309
3310         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3311 }
3312
3313 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3314         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3315                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3316         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3317                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3318         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3319         [NFTA_RULE_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
3320         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3321         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3322         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3323                                     .len = NFT_USERDATA_MAXLEN },
3324         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3325         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3326         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3327 };
3328
3329 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3330                                     u32 portid, u32 seq, int event,
3331                                     u32 flags, int family,
3332                                     const struct nft_table *table,
3333                                     const struct nft_chain *chain,
3334                                     const struct nft_rule *rule, u64 handle,
3335                                     bool reset)
3336 {
3337         struct nlmsghdr *nlh;
3338         const struct nft_expr *expr, *next;
3339         struct nlattr *list;
3340         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3341
3342         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3343                            nft_base_seq(net));
3344         if (!nlh)
3345                 goto nla_put_failure;
3346
3347         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3348                 goto nla_put_failure;
3349         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3350                 goto nla_put_failure;
3351         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3352                          NFTA_RULE_PAD))
3353                 goto nla_put_failure;
3354
3355         if (event != NFT_MSG_DELRULE && handle) {
3356                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3357                                  NFTA_RULE_PAD))
3358                         goto nla_put_failure;
3359         }
3360
3361         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3362                 nft_flow_rule_stats(chain, rule);
3363
3364         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3365         if (list == NULL)
3366                 goto nla_put_failure;
3367         nft_rule_for_each_expr(expr, next, rule) {
3368                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3369                         goto nla_put_failure;
3370         }
3371         nla_nest_end(skb, list);
3372
3373         if (rule->udata) {
3374                 struct nft_userdata *udata = nft_userdata(rule);
3375                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3376                             udata->data) < 0)
3377                         goto nla_put_failure;
3378         }
3379
3380         nlmsg_end(skb, nlh);
3381         return 0;
3382
3383 nla_put_failure:
3384         nlmsg_trim(skb, nlh);
3385         return -1;
3386 }
3387
3388 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3389                                   const struct nft_rule *rule, int event)
3390 {
3391         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3392         const struct nft_rule *prule;
3393         struct sk_buff *skb;
3394         u64 handle = 0;
3395         u16 flags = 0;
3396         int err;
3397
3398         if (!ctx->report &&
3399             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3400                 return;
3401
3402         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3403         if (skb == NULL)
3404                 goto err;
3405
3406         if (event == NFT_MSG_NEWRULE &&
3407             !list_is_first(&rule->list, &ctx->chain->rules) &&
3408             !list_is_last(&rule->list, &ctx->chain->rules)) {
3409                 prule = list_prev_entry(rule, list);
3410                 handle = prule->handle;
3411         }
3412         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3413                 flags |= NLM_F_APPEND;
3414         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3415                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3416
3417         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3418                                        event, flags, ctx->family, ctx->table,
3419                                        ctx->chain, rule, handle, false);
3420         if (err < 0) {
3421                 kfree_skb(skb);
3422                 goto err;
3423         }
3424
3425         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3426         return;
3427 err:
3428         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3429 }
3430
3431 static void audit_log_rule_reset(const struct nft_table *table,
3432                                  unsigned int base_seq,
3433                                  unsigned int nentries)
3434 {
3435         char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3436                               table->name, base_seq);
3437
3438         audit_log_nfcfg(buf, table->family, nentries,
3439                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3440         kfree(buf);
3441 }
3442
3443 struct nft_rule_dump_ctx {
3444         unsigned int s_idx;
3445         char *table;
3446         char *chain;
3447         bool reset;
3448 };
3449
3450 static int __nf_tables_dump_rules(struct sk_buff *skb,
3451                                   unsigned int *idx,
3452                                   struct netlink_callback *cb,
3453                                   const struct nft_table *table,
3454                                   const struct nft_chain *chain)
3455 {
3456         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3457         struct net *net = sock_net(skb->sk);
3458         const struct nft_rule *rule, *prule;
3459         unsigned int entries = 0;
3460         int ret = 0;
3461         u64 handle;
3462
3463         prule = NULL;
3464         list_for_each_entry_rcu(rule, &chain->rules, list) {
3465                 if (!nft_is_active(net, rule))
3466                         goto cont_skip;
3467                 if (*idx < ctx->s_idx)
3468                         goto cont;
3469                 if (prule)
3470                         handle = prule->handle;
3471                 else
3472                         handle = 0;
3473
3474                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3475                                         cb->nlh->nlmsg_seq,
3476                                         NFT_MSG_NEWRULE,
3477                                         NLM_F_MULTI | NLM_F_APPEND,
3478                                         table->family,
3479                                         table, chain, rule, handle, ctx->reset) < 0) {
3480                         ret = 1;
3481                         break;
3482                 }
3483                 entries++;
3484                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3485 cont:
3486                 prule = rule;
3487 cont_skip:
3488                 (*idx)++;
3489         }
3490
3491         if (ctx->reset && entries)
3492                 audit_log_rule_reset(table, cb->seq, entries);
3493
3494         return ret;
3495 }
3496
3497 static int nf_tables_dump_rules(struct sk_buff *skb,
3498                                 struct netlink_callback *cb)
3499 {
3500         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3501         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3502         struct nft_table *table;
3503         const struct nft_chain *chain;
3504         unsigned int idx = 0;
3505         struct net *net = sock_net(skb->sk);
3506         int family = nfmsg->nfgen_family;
3507         struct nftables_pernet *nft_net;
3508
3509         rcu_read_lock();
3510         nft_net = nft_pernet(net);
3511         cb->seq = READ_ONCE(nft_net->base_seq);
3512
3513         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3514                 if (family != NFPROTO_UNSPEC && family != table->family)
3515                         continue;
3516
3517                 if (ctx->table && strcmp(ctx->table, table->name) != 0)
3518                         continue;
3519
3520                 if (ctx->table && ctx->chain) {
3521                         struct rhlist_head *list, *tmp;
3522
3523                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3524                                                nft_chain_ht_params);
3525                         if (!list)
3526                                 goto done;
3527
3528                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3529                                 if (!nft_is_active(net, chain))
3530                                         continue;
3531                                 __nf_tables_dump_rules(skb, &idx,
3532                                                        cb, table, chain);
3533                                 break;
3534                         }
3535                         goto done;
3536                 }
3537
3538                 list_for_each_entry_rcu(chain, &table->chains, list) {
3539                         if (__nf_tables_dump_rules(skb, &idx,
3540                                                    cb, table, chain))
3541                                 goto done;
3542                 }
3543
3544                 if (ctx->table)
3545                         break;
3546         }
3547 done:
3548         rcu_read_unlock();
3549
3550         ctx->s_idx = idx;
3551         return skb->len;
3552 }
3553
3554 static int nf_tables_dumpreset_rules(struct sk_buff *skb,
3555                                      struct netlink_callback *cb)
3556 {
3557         struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
3558         int ret;
3559
3560         /* Mutex is held is to prevent that two concurrent dump-and-reset calls
3561          * do not underrun counters and quotas. The commit_mutex is used for
3562          * the lack a better lock, this is not transaction path.
3563          */
3564         mutex_lock(&nft_net->commit_mutex);
3565         ret = nf_tables_dump_rules(skb, cb);
3566         mutex_unlock(&nft_net->commit_mutex);
3567
3568         return ret;
3569 }
3570
3571 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3572 {
3573         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3574         const struct nlattr * const *nla = cb->data;
3575
3576         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
3577
3578         if (nla[NFTA_RULE_TABLE]) {
3579                 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], GFP_ATOMIC);
3580                 if (!ctx->table)
3581                         return -ENOMEM;
3582         }
3583         if (nla[NFTA_RULE_CHAIN]) {
3584                 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], GFP_ATOMIC);
3585                 if (!ctx->chain) {
3586                         kfree(ctx->table);
3587                         return -ENOMEM;
3588                 }
3589         }
3590         return 0;
3591 }
3592
3593 static int nf_tables_dumpreset_rules_start(struct netlink_callback *cb)
3594 {
3595         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3596
3597         ctx->reset = true;
3598
3599         return nf_tables_dump_rules_start(cb);
3600 }
3601
3602 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3603 {
3604         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3605
3606         kfree(ctx->table);
3607         kfree(ctx->chain);
3608         return 0;
3609 }
3610
3611 /* called with rcu_read_lock held */
3612 static struct sk_buff *
3613 nf_tables_getrule_single(u32 portid, const struct nfnl_info *info,
3614                          const struct nlattr * const nla[], bool reset)
3615 {
3616         struct netlink_ext_ack *extack = info->extack;
3617         u8 genmask = nft_genmask_cur(info->net);
3618         u8 family = info->nfmsg->nfgen_family;
3619         const struct nft_chain *chain;
3620         const struct nft_rule *rule;
3621         struct net *net = info->net;
3622         struct nft_table *table;
3623         struct sk_buff *skb2;
3624         int err;
3625
3626         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3627         if (IS_ERR(table)) {
3628                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3629                 return ERR_CAST(table);
3630         }
3631
3632         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3633         if (IS_ERR(chain)) {
3634                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3635                 return ERR_CAST(chain);
3636         }
3637
3638         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3639         if (IS_ERR(rule)) {
3640                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3641                 return ERR_CAST(rule);
3642         }
3643
3644         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3645         if (!skb2)
3646                 return ERR_PTR(-ENOMEM);
3647
3648         err = nf_tables_fill_rule_info(skb2, net, portid,
3649                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3650                                        family, table, chain, rule, 0, reset);
3651         if (err < 0) {
3652                 kfree_skb(skb2);
3653                 return ERR_PTR(err);
3654         }
3655
3656         return skb2;
3657 }
3658
3659 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3660                              const struct nlattr * const nla[])
3661 {
3662         u32 portid = NETLINK_CB(skb).portid;
3663         struct net *net = info->net;
3664         struct sk_buff *skb2;
3665
3666         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3667                 struct netlink_dump_control c = {
3668                         .start= nf_tables_dump_rules_start,
3669                         .dump = nf_tables_dump_rules,
3670                         .done = nf_tables_dump_rules_done,
3671                         .module = THIS_MODULE,
3672                         .data = (void *)nla,
3673                 };
3674
3675                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3676         }
3677
3678         skb2 = nf_tables_getrule_single(portid, info, nla, false);
3679         if (IS_ERR(skb2))
3680                 return PTR_ERR(skb2);
3681
3682         return nfnetlink_unicast(skb2, net, portid);
3683 }
3684
3685 static int nf_tables_getrule_reset(struct sk_buff *skb,
3686                                    const struct nfnl_info *info,
3687                                    const struct nlattr * const nla[])
3688 {
3689         struct nftables_pernet *nft_net = nft_pernet(info->net);
3690         u32 portid = NETLINK_CB(skb).portid;
3691         struct net *net = info->net;
3692         struct sk_buff *skb2;
3693         char *buf;
3694
3695         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3696                 struct netlink_dump_control c = {
3697                         .start= nf_tables_dumpreset_rules_start,
3698                         .dump = nf_tables_dumpreset_rules,
3699                         .done = nf_tables_dump_rules_done,
3700                         .module = THIS_MODULE,
3701                         .data = (void *)nla,
3702                 };
3703
3704                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3705         }
3706
3707         if (!try_module_get(THIS_MODULE))
3708                 return -EINVAL;
3709         rcu_read_unlock();
3710         mutex_lock(&nft_net->commit_mutex);
3711         skb2 = nf_tables_getrule_single(portid, info, nla, true);
3712         mutex_unlock(&nft_net->commit_mutex);
3713         rcu_read_lock();
3714         module_put(THIS_MODULE);
3715
3716         if (IS_ERR(skb2))
3717                 return PTR_ERR(skb2);
3718
3719         buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
3720                         nla_len(nla[NFTA_RULE_TABLE]),
3721                         (char *)nla_data(nla[NFTA_RULE_TABLE]),
3722                         nft_net->base_seq);
3723         audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
3724                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3725         kfree(buf);
3726
3727         return nfnetlink_unicast(skb2, net, portid);
3728 }
3729
3730 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3731 {
3732         struct nft_expr *expr, *next;
3733
3734         /*
3735          * Careful: some expressions might not be initialized in case this
3736          * is called on error from nf_tables_newrule().
3737          */
3738         expr = nft_expr_first(rule);
3739         while (nft_expr_more(rule, expr)) {
3740                 next = nft_expr_next(expr);
3741                 nf_tables_expr_destroy(ctx, expr);
3742                 expr = next;
3743         }
3744         kfree(rule);
3745 }
3746
3747 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3748 {
3749         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3750         nf_tables_rule_destroy(ctx, rule);
3751 }
3752
3753 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3754 {
3755         struct nft_expr *expr, *last;
3756         const struct nft_data *data;
3757         struct nft_rule *rule;
3758         int err;
3759
3760         if (ctx->level == NFT_JUMP_STACK_SIZE)
3761                 return -EMLINK;
3762
3763         list_for_each_entry(rule, &chain->rules, list) {
3764                 if (fatal_signal_pending(current))
3765                         return -EINTR;
3766
3767                 if (!nft_is_active_next(ctx->net, rule))
3768                         continue;
3769
3770                 nft_rule_for_each_expr(expr, last, rule) {
3771                         if (!expr->ops->validate)
3772                                 continue;
3773
3774                         err = expr->ops->validate(ctx, expr, &data);
3775                         if (err < 0)
3776                                 return err;
3777                 }
3778         }
3779
3780         return 0;
3781 }
3782 EXPORT_SYMBOL_GPL(nft_chain_validate);
3783
3784 static int nft_table_validate(struct net *net, const struct nft_table *table)
3785 {
3786         struct nft_chain *chain;
3787         struct nft_ctx ctx = {
3788                 .net    = net,
3789                 .family = table->family,
3790         };
3791         int err;
3792
3793         list_for_each_entry(chain, &table->chains, list) {
3794                 if (!nft_is_base_chain(chain))
3795                         continue;
3796
3797                 ctx.chain = chain;
3798                 err = nft_chain_validate(&ctx, chain);
3799                 if (err < 0)
3800                         return err;
3801
3802                 cond_resched();
3803         }
3804
3805         return 0;
3806 }
3807
3808 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3809                          const struct nft_set_iter *iter,
3810                          struct nft_set_elem *elem)
3811 {
3812         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3813         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3814         const struct nft_data *data;
3815         int err;
3816
3817         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3818             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3819                 return 0;
3820
3821         data = nft_set_ext_data(ext);
3822         switch (data->verdict.code) {
3823         case NFT_JUMP:
3824         case NFT_GOTO:
3825                 pctx->level++;
3826                 err = nft_chain_validate(ctx, data->verdict.chain);
3827                 if (err < 0)
3828                         return err;
3829                 pctx->level--;
3830                 break;
3831         default:
3832                 break;
3833         }
3834
3835         return 0;
3836 }
3837
3838 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3839 {
3840         u8 genmask = nft_genmask_next(ctx->net);
3841         struct nft_set_elem_catchall *catchall;
3842         struct nft_set_elem elem;
3843         struct nft_set_ext *ext;
3844         int ret = 0;
3845
3846         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3847                 ext = nft_set_elem_ext(set, catchall->elem);
3848                 if (!nft_set_elem_active(ext, genmask))
3849                         continue;
3850
3851                 elem.priv = catchall->elem;
3852                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3853                 if (ret < 0)
3854                         return ret;
3855         }
3856
3857         return ret;
3858 }
3859
3860 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3861                                              const struct nft_chain *chain,
3862                                              const struct nlattr *nla);
3863
3864 #define NFT_RULE_MAXEXPRS       128
3865
3866 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3867                              const struct nlattr * const nla[])
3868 {
3869         struct nftables_pernet *nft_net = nft_pernet(info->net);
3870         struct netlink_ext_ack *extack = info->extack;
3871         unsigned int size, i, n, ulen = 0, usize = 0;
3872         u8 genmask = nft_genmask_next(info->net);
3873         struct nft_rule *rule, *old_rule = NULL;
3874         struct nft_expr_info *expr_info = NULL;
3875         u8 family = info->nfmsg->nfgen_family;
3876         struct nft_flow_rule *flow = NULL;
3877         struct net *net = info->net;
3878         struct nft_userdata *udata;
3879         struct nft_table *table;
3880         struct nft_chain *chain;
3881         struct nft_trans *trans;
3882         u64 handle, pos_handle;
3883         struct nft_expr *expr;
3884         struct nft_ctx ctx;
3885         struct nlattr *tmp;
3886         int err, rem;
3887
3888         lockdep_assert_held(&nft_net->commit_mutex);
3889
3890         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3891                                  NETLINK_CB(skb).portid);
3892         if (IS_ERR(table)) {
3893                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3894                 return PTR_ERR(table);
3895         }
3896
3897         if (nla[NFTA_RULE_CHAIN]) {
3898                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3899                                          genmask);
3900                 if (IS_ERR(chain)) {
3901                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3902                         return PTR_ERR(chain);
3903                 }
3904
3905         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3906                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3907                                               genmask);
3908                 if (IS_ERR(chain)) {
3909                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3910                         return PTR_ERR(chain);
3911                 }
3912         } else {
3913                 return -EINVAL;
3914         }
3915
3916         if (nft_chain_is_bound(chain))
3917                 return -EOPNOTSUPP;
3918
3919         if (nla[NFTA_RULE_HANDLE]) {
3920                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3921                 rule = __nft_rule_lookup(chain, handle);
3922                 if (IS_ERR(rule)) {
3923                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3924                         return PTR_ERR(rule);
3925                 }
3926
3927                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3928                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3929                         return -EEXIST;
3930                 }
3931                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3932                         old_rule = rule;
3933                 else
3934                         return -EOPNOTSUPP;
3935         } else {
3936                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3937                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3938                         return -EINVAL;
3939                 handle = nf_tables_alloc_handle(table);
3940
3941                 if (nla[NFTA_RULE_POSITION]) {
3942                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3943                         old_rule = __nft_rule_lookup(chain, pos_handle);
3944                         if (IS_ERR(old_rule)) {
3945                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3946                                 return PTR_ERR(old_rule);
3947                         }
3948                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3949                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3950                         if (IS_ERR(old_rule)) {
3951                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3952                                 return PTR_ERR(old_rule);
3953                         }
3954                 }
3955         }
3956
3957         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3958
3959         n = 0;
3960         size = 0;
3961         if (nla[NFTA_RULE_EXPRESSIONS]) {
3962                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3963                                            sizeof(struct nft_expr_info),
3964                                            GFP_KERNEL);
3965                 if (!expr_info)
3966                         return -ENOMEM;
3967
3968                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3969                         err = -EINVAL;
3970                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3971                                 goto err_release_expr;
3972                         if (n == NFT_RULE_MAXEXPRS)
3973                                 goto err_release_expr;
3974                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3975                         if (err < 0) {
3976                                 NL_SET_BAD_ATTR(extack, tmp);
3977                                 goto err_release_expr;
3978                         }
3979                         size += expr_info[n].ops->size;
3980                         n++;
3981                 }
3982         }
3983         /* Check for overflow of dlen field */
3984         err = -EFBIG;
3985         if (size >= 1 << 12)
3986                 goto err_release_expr;
3987
3988         if (nla[NFTA_RULE_USERDATA]) {
3989                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3990                 if (ulen > 0)
3991                         usize = sizeof(struct nft_userdata) + ulen;
3992         }
3993
3994         err = -ENOMEM;
3995         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3996         if (rule == NULL)
3997                 goto err_release_expr;
3998
3999         nft_activate_next(net, rule);
4000
4001         rule->handle = handle;
4002         rule->dlen   = size;
4003         rule->udata  = ulen ? 1 : 0;
4004
4005         if (ulen) {
4006                 udata = nft_userdata(rule);
4007                 udata->len = ulen - 1;
4008                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
4009         }
4010
4011         expr = nft_expr_first(rule);
4012         for (i = 0; i < n; i++) {
4013                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
4014                 if (err < 0) {
4015                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
4016                         goto err_release_rule;
4017                 }
4018
4019                 if (expr_info[i].ops->validate)
4020                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
4021
4022                 expr_info[i].ops = NULL;
4023                 expr = nft_expr_next(expr);
4024         }
4025
4026         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
4027                 flow = nft_flow_rule_create(net, rule);
4028                 if (IS_ERR(flow)) {
4029                         err = PTR_ERR(flow);
4030                         goto err_release_rule;
4031                 }
4032         }
4033
4034         if (!nft_use_inc(&chain->use)) {
4035                 err = -EMFILE;
4036                 goto err_release_rule;
4037         }
4038
4039         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
4040                 if (nft_chain_binding(chain)) {
4041                         err = -EOPNOTSUPP;
4042                         goto err_destroy_flow_rule;
4043                 }
4044
4045                 err = nft_delrule(&ctx, old_rule);
4046                 if (err < 0)
4047                         goto err_destroy_flow_rule;
4048
4049                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4050                 if (trans == NULL) {
4051                         err = -ENOMEM;
4052                         goto err_destroy_flow_rule;
4053                 }
4054                 list_add_tail_rcu(&rule->list, &old_rule->list);
4055         } else {
4056                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4057                 if (!trans) {
4058                         err = -ENOMEM;
4059                         goto err_destroy_flow_rule;
4060                 }
4061
4062                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4063                         if (old_rule)
4064                                 list_add_rcu(&rule->list, &old_rule->list);
4065                         else
4066                                 list_add_tail_rcu(&rule->list, &chain->rules);
4067                  } else {
4068                         if (old_rule)
4069                                 list_add_tail_rcu(&rule->list, &old_rule->list);
4070                         else
4071                                 list_add_rcu(&rule->list, &chain->rules);
4072                 }
4073         }
4074         kvfree(expr_info);
4075
4076         if (flow)
4077                 nft_trans_flow_rule(trans) = flow;
4078
4079         if (table->validate_state == NFT_VALIDATE_DO)
4080                 return nft_table_validate(net, table);
4081
4082         return 0;
4083
4084 err_destroy_flow_rule:
4085         nft_use_dec_restore(&chain->use);
4086         if (flow)
4087                 nft_flow_rule_destroy(flow);
4088 err_release_rule:
4089         nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4090         nf_tables_rule_destroy(&ctx, rule);
4091 err_release_expr:
4092         for (i = 0; i < n; i++) {
4093                 if (expr_info[i].ops) {
4094                         module_put(expr_info[i].ops->type->owner);
4095                         if (expr_info[i].ops->type->release_ops)
4096                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4097                 }
4098         }
4099         kvfree(expr_info);
4100
4101         return err;
4102 }
4103
4104 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4105                                              const struct nft_chain *chain,
4106                                              const struct nlattr *nla)
4107 {
4108         struct nftables_pernet *nft_net = nft_pernet(net);
4109         u32 id = ntohl(nla_get_be32(nla));
4110         struct nft_trans *trans;
4111
4112         list_for_each_entry(trans, &nft_net->commit_list, list) {
4113                 if (trans->msg_type == NFT_MSG_NEWRULE &&
4114                     trans->ctx.chain == chain &&
4115                     id == nft_trans_rule_id(trans))
4116                         return nft_trans_rule(trans);
4117         }
4118         return ERR_PTR(-ENOENT);
4119 }
4120
4121 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4122                              const struct nlattr * const nla[])
4123 {
4124         struct netlink_ext_ack *extack = info->extack;
4125         u8 genmask = nft_genmask_next(info->net);
4126         u8 family = info->nfmsg->nfgen_family;
4127         struct nft_chain *chain = NULL;
4128         struct net *net = info->net;
4129         struct nft_table *table;
4130         struct nft_rule *rule;
4131         struct nft_ctx ctx;
4132         int err = 0;
4133
4134         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4135                                  NETLINK_CB(skb).portid);
4136         if (IS_ERR(table)) {
4137                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4138                 return PTR_ERR(table);
4139         }
4140
4141         if (nla[NFTA_RULE_CHAIN]) {
4142                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4143                                          genmask);
4144                 if (IS_ERR(chain)) {
4145                         if (PTR_ERR(chain) == -ENOENT &&
4146                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4147                                 return 0;
4148
4149                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4150                         return PTR_ERR(chain);
4151                 }
4152                 if (nft_chain_binding(chain))
4153                         return -EOPNOTSUPP;
4154         }
4155
4156         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4157
4158         if (chain) {
4159                 if (nla[NFTA_RULE_HANDLE]) {
4160                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4161                         if (IS_ERR(rule)) {
4162                                 if (PTR_ERR(rule) == -ENOENT &&
4163                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4164                                         return 0;
4165
4166                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4167                                 return PTR_ERR(rule);
4168                         }
4169
4170                         err = nft_delrule(&ctx, rule);
4171                 } else if (nla[NFTA_RULE_ID]) {
4172                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4173                         if (IS_ERR(rule)) {
4174                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4175                                 return PTR_ERR(rule);
4176                         }
4177
4178                         err = nft_delrule(&ctx, rule);
4179                 } else {
4180                         err = nft_delrule_by_chain(&ctx);
4181                 }
4182         } else {
4183                 list_for_each_entry(chain, &table->chains, list) {
4184                         if (!nft_is_active_next(net, chain))
4185                                 continue;
4186                         if (nft_chain_binding(chain))
4187                                 continue;
4188
4189                         ctx.chain = chain;
4190                         err = nft_delrule_by_chain(&ctx);
4191                         if (err < 0)
4192                                 break;
4193                 }
4194         }
4195
4196         return err;
4197 }
4198
4199 /*
4200  * Sets
4201  */
4202 static const struct nft_set_type *nft_set_types[] = {
4203         &nft_set_hash_fast_type,
4204         &nft_set_hash_type,
4205         &nft_set_rhash_type,
4206         &nft_set_bitmap_type,
4207         &nft_set_rbtree_type,
4208 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4209         &nft_set_pipapo_avx2_type,
4210 #endif
4211         &nft_set_pipapo_type,
4212 };
4213
4214 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
4215                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4216                                  NFT_SET_EVAL)
4217
4218 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4219 {
4220         return (flags & type->features) == (flags & NFT_SET_FEATURES);
4221 }
4222
4223 /*
4224  * Select a set implementation based on the data characteristics and the
4225  * given policy. The total memory use might not be known if no size is
4226  * given, in that case the amount of memory per element is used.
4227  */
4228 static const struct nft_set_ops *
4229 nft_select_set_ops(const struct nft_ctx *ctx,
4230                    const struct nlattr * const nla[],
4231                    const struct nft_set_desc *desc)
4232 {
4233         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4234         const struct nft_set_ops *ops, *bops;
4235         struct nft_set_estimate est, best;
4236         const struct nft_set_type *type;
4237         u32 flags = 0;
4238         int i;
4239
4240         lockdep_assert_held(&nft_net->commit_mutex);
4241         lockdep_nfnl_nft_mutex_not_held();
4242
4243         if (nla[NFTA_SET_FLAGS] != NULL)
4244                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4245
4246         bops        = NULL;
4247         best.size   = ~0;
4248         best.lookup = ~0;
4249         best.space  = ~0;
4250
4251         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4252                 type = nft_set_types[i];
4253                 ops = &type->ops;
4254
4255                 if (!nft_set_ops_candidate(type, flags))
4256                         continue;
4257                 if (!ops->estimate(desc, flags, &est))
4258                         continue;
4259
4260                 switch (desc->policy) {
4261                 case NFT_SET_POL_PERFORMANCE:
4262                         if (est.lookup < best.lookup)
4263                                 break;
4264                         if (est.lookup == best.lookup &&
4265                             est.space < best.space)
4266                                 break;
4267                         continue;
4268                 case NFT_SET_POL_MEMORY:
4269                         if (!desc->size) {
4270                                 if (est.space < best.space)
4271                                         break;
4272                                 if (est.space == best.space &&
4273                                     est.lookup < best.lookup)
4274                                         break;
4275                         } else if (est.size < best.size || !bops) {
4276                                 break;
4277                         }
4278                         continue;
4279                 default:
4280                         break;
4281                 }
4282
4283                 bops = ops;
4284                 best = est;
4285         }
4286
4287         if (bops != NULL)
4288                 return bops;
4289
4290         return ERR_PTR(-EOPNOTSUPP);
4291 }
4292
4293 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4294         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4295                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4296         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4297                                             .len = NFT_SET_MAXNAMELEN - 1 },
4298         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4299         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4300         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4301         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4302         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4303         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4304         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4305         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4306         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4307         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4308         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4309                                             .len  = NFT_USERDATA_MAXLEN },
4310         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4311         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4312         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4313         [NFTA_SET_EXPRESSIONS]          = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
4314 };
4315
4316 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4317         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4318 };
4319
4320 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4321         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4322         [NFTA_SET_DESC_CONCAT]          = NLA_POLICY_NESTED_ARRAY(nft_concat_policy),
4323 };
4324
4325 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4326                                       const struct nlattr *nla, u8 genmask)
4327 {
4328         struct nft_set *set;
4329
4330         if (nla == NULL)
4331                 return ERR_PTR(-EINVAL);
4332
4333         list_for_each_entry_rcu(set, &table->sets, list) {
4334                 if (!nla_strcmp(nla, set->name) &&
4335                     nft_active_genmask(set, genmask))
4336                         return set;
4337         }
4338         return ERR_PTR(-ENOENT);
4339 }
4340
4341 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4342                                                const struct nlattr *nla,
4343                                                u8 genmask)
4344 {
4345         struct nft_set *set;
4346
4347         list_for_each_entry(set, &table->sets, list) {
4348                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4349                     nft_active_genmask(set, genmask))
4350                         return set;
4351         }
4352         return ERR_PTR(-ENOENT);
4353 }
4354
4355 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4356                                            const struct nft_table *table,
4357                                            const struct nlattr *nla, u8 genmask)
4358 {
4359         struct nftables_pernet *nft_net = nft_pernet(net);
4360         u32 id = ntohl(nla_get_be32(nla));
4361         struct nft_trans *trans;
4362
4363         list_for_each_entry(trans, &nft_net->commit_list, list) {
4364                 if (trans->msg_type == NFT_MSG_NEWSET) {
4365                         struct nft_set *set = nft_trans_set(trans);
4366
4367                         if (id == nft_trans_set_id(trans) &&
4368                             set->table == table &&
4369                             nft_active_genmask(set, genmask))
4370                                 return set;
4371                 }
4372         }
4373         return ERR_PTR(-ENOENT);
4374 }
4375
4376 struct nft_set *nft_set_lookup_global(const struct net *net,
4377                                       const struct nft_table *table,
4378                                       const struct nlattr *nla_set_name,
4379                                       const struct nlattr *nla_set_id,
4380                                       u8 genmask)
4381 {
4382         struct nft_set *set;
4383
4384         set = nft_set_lookup(table, nla_set_name, genmask);
4385         if (IS_ERR(set)) {
4386                 if (!nla_set_id)
4387                         return set;
4388
4389                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4390         }
4391         return set;
4392 }
4393 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4394
4395 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4396                                     const char *name)
4397 {
4398         const struct nft_set *i;
4399         const char *p;
4400         unsigned long *inuse;
4401         unsigned int n = 0, min = 0;
4402
4403         p = strchr(name, '%');
4404         if (p != NULL) {
4405                 if (p[1] != 'd' || strchr(p + 2, '%'))
4406                         return -EINVAL;
4407
4408                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4409                 if (inuse == NULL)
4410                         return -ENOMEM;
4411 cont:
4412                 list_for_each_entry(i, &ctx->table->sets, list) {
4413                         int tmp;
4414
4415                         if (!nft_is_active_next(ctx->net, i))
4416                                 continue;
4417                         if (!sscanf(i->name, name, &tmp))
4418                                 continue;
4419                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4420                                 continue;
4421
4422                         set_bit(tmp - min, inuse);
4423                 }
4424
4425                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4426                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4427                         min += BITS_PER_BYTE * PAGE_SIZE;
4428                         memset(inuse, 0, PAGE_SIZE);
4429                         goto cont;
4430                 }
4431                 free_page((unsigned long)inuse);
4432         }
4433
4434         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4435         if (!set->name)
4436                 return -ENOMEM;
4437
4438         list_for_each_entry(i, &ctx->table->sets, list) {
4439                 if (!nft_is_active_next(ctx->net, i))
4440                         continue;
4441                 if (!strcmp(set->name, i->name)) {
4442                         kfree(set->name);
4443                         set->name = NULL;
4444                         return -ENFILE;
4445                 }
4446         }
4447         return 0;
4448 }
4449
4450 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4451 {
4452         u64 ms = be64_to_cpu(nla_get_be64(nla));
4453         u64 max = (u64)(~((u64)0));
4454
4455         max = div_u64(max, NSEC_PER_MSEC);
4456         if (ms >= max)
4457                 return -ERANGE;
4458
4459         ms *= NSEC_PER_MSEC;
4460         *result = nsecs_to_jiffies64(ms);
4461         return 0;
4462 }
4463
4464 __be64 nf_jiffies64_to_msecs(u64 input)
4465 {
4466         return cpu_to_be64(jiffies64_to_msecs(input));
4467 }
4468
4469 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4470                                      const struct nft_set *set)
4471 {
4472         struct nlattr *concat, *field;
4473         int i;
4474
4475         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4476         if (!concat)
4477                 return -ENOMEM;
4478
4479         for (i = 0; i < set->field_count; i++) {
4480                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4481                 if (!field)
4482                         return -ENOMEM;
4483
4484                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4485                                  htonl(set->field_len[i])))
4486                         return -ENOMEM;
4487
4488                 nla_nest_end(skb, field);
4489         }
4490
4491         nla_nest_end(skb, concat);
4492
4493         return 0;
4494 }
4495
4496 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4497                               const struct nft_set *set, u16 event, u16 flags)
4498 {
4499         u64 timeout = READ_ONCE(set->timeout);
4500         u32 gc_int = READ_ONCE(set->gc_int);
4501         u32 portid = ctx->portid;
4502         struct nlmsghdr *nlh;
4503         struct nlattr *nest;
4504         u32 seq = ctx->seq;
4505         int i;
4506
4507         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4508         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4509                            NFNETLINK_V0, nft_base_seq(ctx->net));
4510         if (!nlh)
4511                 goto nla_put_failure;
4512
4513         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4514                 goto nla_put_failure;
4515         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4516                 goto nla_put_failure;
4517         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4518                          NFTA_SET_PAD))
4519                 goto nla_put_failure;
4520
4521         if (event == NFT_MSG_DELSET) {
4522                 nlmsg_end(skb, nlh);
4523                 return 0;
4524         }
4525
4526         if (set->flags != 0)
4527                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4528                         goto nla_put_failure;
4529
4530         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4531                 goto nla_put_failure;
4532         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4533                 goto nla_put_failure;
4534         if (set->flags & NFT_SET_MAP) {
4535                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4536                         goto nla_put_failure;
4537                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4538                         goto nla_put_failure;
4539         }
4540         if (set->flags & NFT_SET_OBJECT &&
4541             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4542                 goto nla_put_failure;
4543
4544         if (timeout &&
4545             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4546                          nf_jiffies64_to_msecs(timeout),
4547                          NFTA_SET_PAD))
4548                 goto nla_put_failure;
4549         if (gc_int &&
4550             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4551                 goto nla_put_failure;
4552
4553         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4554                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4555                         goto nla_put_failure;
4556         }
4557
4558         if (set->udata &&
4559             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4560                 goto nla_put_failure;
4561
4562         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4563         if (!nest)
4564                 goto nla_put_failure;
4565         if (set->size &&
4566             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4567                 goto nla_put_failure;
4568
4569         if (set->field_count > 1 &&
4570             nf_tables_fill_set_concat(skb, set))
4571                 goto nla_put_failure;
4572
4573         nla_nest_end(skb, nest);
4574
4575         if (set->num_exprs == 1) {
4576                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4577                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4578                         goto nla_put_failure;
4579
4580                 nla_nest_end(skb, nest);
4581         } else if (set->num_exprs > 1) {
4582                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4583                 if (nest == NULL)
4584                         goto nla_put_failure;
4585
4586                 for (i = 0; i < set->num_exprs; i++) {
4587                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4588                                           set->exprs[i], false) < 0)
4589                                 goto nla_put_failure;
4590                 }
4591                 nla_nest_end(skb, nest);
4592         }
4593
4594         nlmsg_end(skb, nlh);
4595         return 0;
4596
4597 nla_put_failure:
4598         nlmsg_trim(skb, nlh);
4599         return -1;
4600 }
4601
4602 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4603                                  const struct nft_set *set, int event,
4604                                  gfp_t gfp_flags)
4605 {
4606         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4607         u32 portid = ctx->portid;
4608         struct sk_buff *skb;
4609         u16 flags = 0;
4610         int err;
4611
4612         if (!ctx->report &&
4613             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4614                 return;
4615
4616         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4617         if (skb == NULL)
4618                 goto err;
4619
4620         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4621                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4622
4623         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4624         if (err < 0) {
4625                 kfree_skb(skb);
4626                 goto err;
4627         }
4628
4629         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4630         return;
4631 err:
4632         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4633 }
4634
4635 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4636 {
4637         const struct nft_set *set;
4638         unsigned int idx, s_idx = cb->args[0];
4639         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4640         struct net *net = sock_net(skb->sk);
4641         struct nft_ctx *ctx = cb->data, ctx_set;
4642         struct nftables_pernet *nft_net;
4643
4644         if (cb->args[1])
4645                 return skb->len;
4646
4647         rcu_read_lock();
4648         nft_net = nft_pernet(net);
4649         cb->seq = READ_ONCE(nft_net->base_seq);
4650
4651         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4652                 if (ctx->family != NFPROTO_UNSPEC &&
4653                     ctx->family != table->family)
4654                         continue;
4655
4656                 if (ctx->table && ctx->table != table)
4657                         continue;
4658
4659                 if (cur_table) {
4660                         if (cur_table != table)
4661                                 continue;
4662
4663                         cur_table = NULL;
4664                 }
4665                 idx = 0;
4666                 list_for_each_entry_rcu(set, &table->sets, list) {
4667                         if (idx < s_idx)
4668                                 goto cont;
4669                         if (!nft_is_active(net, set))
4670                                 goto cont;
4671
4672                         ctx_set = *ctx;
4673                         ctx_set.table = table;
4674                         ctx_set.family = table->family;
4675
4676                         if (nf_tables_fill_set(skb, &ctx_set, set,
4677                                                NFT_MSG_NEWSET,
4678                                                NLM_F_MULTI) < 0) {
4679                                 cb->args[0] = idx;
4680                                 cb->args[2] = (unsigned long) table;
4681                                 goto done;
4682                         }
4683                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4684 cont:
4685                         idx++;
4686                 }
4687                 if (s_idx)
4688                         s_idx = 0;
4689         }
4690         cb->args[1] = 1;
4691 done:
4692         rcu_read_unlock();
4693         return skb->len;
4694 }
4695
4696 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4697 {
4698         struct nft_ctx *ctx_dump = NULL;
4699
4700         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4701         if (ctx_dump == NULL)
4702                 return -ENOMEM;
4703
4704         cb->data = ctx_dump;
4705         return 0;
4706 }
4707
4708 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4709 {
4710         kfree(cb->data);
4711         return 0;
4712 }
4713
4714 /* called with rcu_read_lock held */
4715 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4716                             const struct nlattr * const nla[])
4717 {
4718         struct netlink_ext_ack *extack = info->extack;
4719         u8 genmask = nft_genmask_cur(info->net);
4720         u8 family = info->nfmsg->nfgen_family;
4721         struct nft_table *table = NULL;
4722         struct net *net = info->net;
4723         const struct nft_set *set;
4724         struct sk_buff *skb2;
4725         struct nft_ctx ctx;
4726         int err;
4727
4728         if (nla[NFTA_SET_TABLE]) {
4729                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4730                                          genmask, 0);
4731                 if (IS_ERR(table)) {
4732                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4733                         return PTR_ERR(table);
4734                 }
4735         }
4736
4737         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4738
4739         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4740                 struct netlink_dump_control c = {
4741                         .start = nf_tables_dump_sets_start,
4742                         .dump = nf_tables_dump_sets,
4743                         .done = nf_tables_dump_sets_done,
4744                         .data = &ctx,
4745                         .module = THIS_MODULE,
4746                 };
4747
4748                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4749         }
4750
4751         /* Only accept unspec with dump */
4752         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4753                 return -EAFNOSUPPORT;
4754         if (!nla[NFTA_SET_TABLE])
4755                 return -EINVAL;
4756
4757         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4758         if (IS_ERR(set)) {
4759                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4760                 return PTR_ERR(set);
4761         }
4762
4763         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4764         if (skb2 == NULL)
4765                 return -ENOMEM;
4766
4767         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4768         if (err < 0)
4769                 goto err_fill_set_info;
4770
4771         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4772
4773 err_fill_set_info:
4774         kfree_skb(skb2);
4775         return err;
4776 }
4777
4778 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4779                                      struct nft_set_desc *desc)
4780 {
4781         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4782         u32 len;
4783         int err;
4784
4785         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4786                 return -E2BIG;
4787
4788         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4789                                           nft_concat_policy, NULL);
4790         if (err < 0)
4791                 return err;
4792
4793         if (!tb[NFTA_SET_FIELD_LEN])
4794                 return -EINVAL;
4795
4796         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4797         if (!len || len > U8_MAX)
4798                 return -EINVAL;
4799
4800         desc->field_len[desc->field_count++] = len;
4801
4802         return 0;
4803 }
4804
4805 static int nft_set_desc_concat(struct nft_set_desc *desc,
4806                                const struct nlattr *nla)
4807 {
4808         struct nlattr *attr;
4809         u32 num_regs = 0;
4810         int rem, err, i;
4811
4812         nla_for_each_nested(attr, nla, rem) {
4813                 if (nla_type(attr) != NFTA_LIST_ELEM)
4814                         return -EINVAL;
4815
4816                 err = nft_set_desc_concat_parse(attr, desc);
4817                 if (err < 0)
4818                         return err;
4819         }
4820
4821         for (i = 0; i < desc->field_count; i++)
4822                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4823
4824         if (num_regs > NFT_REG32_COUNT)
4825                 return -E2BIG;
4826
4827         return 0;
4828 }
4829
4830 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4831                                     const struct nlattr *nla)
4832 {
4833         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4834         int err;
4835
4836         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4837                                           nft_set_desc_policy, NULL);
4838         if (err < 0)
4839                 return err;
4840
4841         if (da[NFTA_SET_DESC_SIZE] != NULL)
4842                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4843         if (da[NFTA_SET_DESC_CONCAT])
4844                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4845
4846         return err;
4847 }
4848
4849 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4850                               const struct nlattr * const *nla,
4851                               struct nft_expr **exprs, int *num_exprs,
4852                               u32 flags)
4853 {
4854         struct nft_expr *expr;
4855         int err, i;
4856
4857         if (nla[NFTA_SET_EXPR]) {
4858                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4859                 if (IS_ERR(expr)) {
4860                         err = PTR_ERR(expr);
4861                         goto err_set_expr_alloc;
4862                 }
4863                 exprs[0] = expr;
4864                 (*num_exprs)++;
4865         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4866                 struct nlattr *tmp;
4867                 int left;
4868
4869                 if (!(flags & NFT_SET_EXPR)) {
4870                         err = -EINVAL;
4871                         goto err_set_expr_alloc;
4872                 }
4873                 i = 0;
4874                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4875                         if (i == NFT_SET_EXPR_MAX) {
4876                                 err = -E2BIG;
4877                                 goto err_set_expr_alloc;
4878                         }
4879                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4880                                 err = -EINVAL;
4881                                 goto err_set_expr_alloc;
4882                         }
4883                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4884                         if (IS_ERR(expr)) {
4885                                 err = PTR_ERR(expr);
4886                                 goto err_set_expr_alloc;
4887                         }
4888                         exprs[i++] = expr;
4889                         (*num_exprs)++;
4890                 }
4891         }
4892
4893         return 0;
4894
4895 err_set_expr_alloc:
4896         for (i = 0; i < *num_exprs; i++)
4897                 nft_expr_destroy(ctx, exprs[i]);
4898
4899         return err;
4900 }
4901
4902 static bool nft_set_is_same(const struct nft_set *set,
4903                             const struct nft_set_desc *desc,
4904                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4905 {
4906         int i;
4907
4908         if (set->ktype != desc->ktype ||
4909             set->dtype != desc->dtype ||
4910             set->flags != flags ||
4911             set->klen != desc->klen ||
4912             set->dlen != desc->dlen ||
4913             set->field_count != desc->field_count ||
4914             set->num_exprs != num_exprs)
4915                 return false;
4916
4917         for (i = 0; i < desc->field_count; i++) {
4918                 if (set->field_len[i] != desc->field_len[i])
4919                         return false;
4920         }
4921
4922         for (i = 0; i < num_exprs; i++) {
4923                 if (set->exprs[i]->ops != exprs[i]->ops)
4924                         return false;
4925         }
4926
4927         return true;
4928 }
4929
4930 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4931                             const struct nlattr * const nla[])
4932 {
4933         struct netlink_ext_ack *extack = info->extack;
4934         u8 genmask = nft_genmask_next(info->net);
4935         u8 family = info->nfmsg->nfgen_family;
4936         const struct nft_set_ops *ops;
4937         struct net *net = info->net;
4938         struct nft_set_desc desc;
4939         struct nft_table *table;
4940         unsigned char *udata;
4941         struct nft_set *set;
4942         struct nft_ctx ctx;
4943         size_t alloc_size;
4944         int num_exprs = 0;
4945         char *name;
4946         int err, i;
4947         u16 udlen;
4948         u32 flags;
4949         u64 size;
4950
4951         if (nla[NFTA_SET_TABLE] == NULL ||
4952             nla[NFTA_SET_NAME] == NULL ||
4953             nla[NFTA_SET_KEY_LEN] == NULL ||
4954             nla[NFTA_SET_ID] == NULL)
4955                 return -EINVAL;
4956
4957         memset(&desc, 0, sizeof(desc));
4958
4959         desc.ktype = NFT_DATA_VALUE;
4960         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4961                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4962                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4963                         return -EINVAL;
4964         }
4965
4966         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4967         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4968                 return -EINVAL;
4969
4970         flags = 0;
4971         if (nla[NFTA_SET_FLAGS] != NULL) {
4972                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4973                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4974                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4975                               NFT_SET_MAP | NFT_SET_EVAL |
4976                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4977                         return -EOPNOTSUPP;
4978                 /* Only one of these operations is supported */
4979                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4980                              (NFT_SET_MAP | NFT_SET_OBJECT))
4981                         return -EOPNOTSUPP;
4982                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4983                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4984                         return -EOPNOTSUPP;
4985         }
4986
4987         desc.dtype = 0;
4988         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4989                 if (!(flags & NFT_SET_MAP))
4990                         return -EINVAL;
4991
4992                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4993                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4994                     desc.dtype != NFT_DATA_VERDICT)
4995                         return -EINVAL;
4996
4997                 if (desc.dtype != NFT_DATA_VERDICT) {
4998                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4999                                 return -EINVAL;
5000                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
5001                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
5002                                 return -EINVAL;
5003                 } else
5004                         desc.dlen = sizeof(struct nft_verdict);
5005         } else if (flags & NFT_SET_MAP)
5006                 return -EINVAL;
5007
5008         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
5009                 if (!(flags & NFT_SET_OBJECT))
5010                         return -EINVAL;
5011
5012                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
5013                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
5014                     desc.objtype > NFT_OBJECT_MAX)
5015                         return -EOPNOTSUPP;
5016         } else if (flags & NFT_SET_OBJECT)
5017                 return -EINVAL;
5018         else
5019                 desc.objtype = NFT_OBJECT_UNSPEC;
5020
5021         desc.timeout = 0;
5022         if (nla[NFTA_SET_TIMEOUT] != NULL) {
5023                 if (!(flags & NFT_SET_TIMEOUT))
5024                         return -EINVAL;
5025
5026                 if (flags & NFT_SET_ANONYMOUS)
5027                         return -EOPNOTSUPP;
5028
5029                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
5030                 if (err)
5031                         return err;
5032         }
5033         desc.gc_int = 0;
5034         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
5035                 if (!(flags & NFT_SET_TIMEOUT))
5036                         return -EINVAL;
5037
5038                 if (flags & NFT_SET_ANONYMOUS)
5039                         return -EOPNOTSUPP;
5040
5041                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
5042         }
5043
5044         desc.policy = NFT_SET_POL_PERFORMANCE;
5045         if (nla[NFTA_SET_POLICY] != NULL)
5046                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
5047
5048         if (nla[NFTA_SET_DESC] != NULL) {
5049                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5050                 if (err < 0)
5051                         return err;
5052
5053                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
5054                         return -EINVAL;
5055         } else if (flags & NFT_SET_CONCAT) {
5056                 return -EINVAL;
5057         }
5058
5059         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5060                 desc.expr = true;
5061
5062         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5063                                  NETLINK_CB(skb).portid);
5064         if (IS_ERR(table)) {
5065                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5066                 return PTR_ERR(table);
5067         }
5068
5069         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5070
5071         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5072         if (IS_ERR(set)) {
5073                 if (PTR_ERR(set) != -ENOENT) {
5074                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5075                         return PTR_ERR(set);
5076                 }
5077         } else {
5078                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5079
5080                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5081                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5082                         return -EEXIST;
5083                 }
5084                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5085                         return -EOPNOTSUPP;
5086
5087                 if (nft_set_is_anonymous(set))
5088                         return -EOPNOTSUPP;
5089
5090                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5091                 if (err < 0)
5092                         return err;
5093
5094                 err = 0;
5095                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5096                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5097                         err = -EEXIST;
5098                 }
5099
5100                 for (i = 0; i < num_exprs; i++)
5101                         nft_expr_destroy(&ctx, exprs[i]);
5102
5103                 if (err < 0)
5104                         return err;
5105
5106                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5107         }
5108
5109         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5110                 return -ENOENT;
5111
5112         ops = nft_select_set_ops(&ctx, nla, &desc);
5113         if (IS_ERR(ops))
5114                 return PTR_ERR(ops);
5115
5116         udlen = 0;
5117         if (nla[NFTA_SET_USERDATA])
5118                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5119
5120         size = 0;
5121         if (ops->privsize != NULL)
5122                 size = ops->privsize(nla, &desc);
5123         alloc_size = sizeof(*set) + size + udlen;
5124         if (alloc_size < size || alloc_size > INT_MAX)
5125                 return -ENOMEM;
5126
5127         if (!nft_use_inc(&table->use))
5128                 return -EMFILE;
5129
5130         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5131         if (!set) {
5132                 err = -ENOMEM;
5133                 goto err_alloc;
5134         }
5135
5136         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5137         if (!name) {
5138                 err = -ENOMEM;
5139                 goto err_set_name;
5140         }
5141
5142         err = nf_tables_set_alloc_name(&ctx, set, name);
5143         kfree(name);
5144         if (err < 0)
5145                 goto err_set_name;
5146
5147         udata = NULL;
5148         if (udlen) {
5149                 udata = set->data + size;
5150                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5151         }
5152
5153         INIT_LIST_HEAD(&set->bindings);
5154         INIT_LIST_HEAD(&set->catchall_list);
5155         refcount_set(&set->refs, 1);
5156         set->table = table;
5157         write_pnet(&set->net, net);
5158         set->ops = ops;
5159         set->ktype = desc.ktype;
5160         set->klen = desc.klen;
5161         set->dtype = desc.dtype;
5162         set->objtype = desc.objtype;
5163         set->dlen = desc.dlen;
5164         set->flags = flags;
5165         set->size = desc.size;
5166         set->policy = desc.policy;
5167         set->udlen = udlen;
5168         set->udata = udata;
5169         set->timeout = desc.timeout;
5170         set->gc_int = desc.gc_int;
5171
5172         set->field_count = desc.field_count;
5173         for (i = 0; i < desc.field_count; i++)
5174                 set->field_len[i] = desc.field_len[i];
5175
5176         err = ops->init(set, &desc, nla);
5177         if (err < 0)
5178                 goto err_set_init;
5179
5180         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5181         if (err < 0)
5182                 goto err_set_destroy;
5183
5184         set->num_exprs = num_exprs;
5185         set->handle = nf_tables_alloc_handle(table);
5186         INIT_LIST_HEAD(&set->pending_update);
5187
5188         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5189         if (err < 0)
5190                 goto err_set_expr_alloc;
5191
5192         list_add_tail_rcu(&set->list, &table->sets);
5193
5194         return 0;
5195
5196 err_set_expr_alloc:
5197         for (i = 0; i < set->num_exprs; i++)
5198                 nft_expr_destroy(&ctx, set->exprs[i]);
5199 err_set_destroy:
5200         ops->destroy(&ctx, set);
5201 err_set_init:
5202         kfree(set->name);
5203 err_set_name:
5204         kvfree(set);
5205 err_alloc:
5206         nft_use_dec_restore(&table->use);
5207
5208         return err;
5209 }
5210
5211 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5212                                      struct nft_set *set)
5213 {
5214         struct nft_set_elem_catchall *next, *catchall;
5215
5216         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5217                 list_del_rcu(&catchall->list);
5218                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5219                 kfree_rcu(catchall, rcu);
5220         }
5221 }
5222
5223 static void nft_set_put(struct nft_set *set)
5224 {
5225         if (refcount_dec_and_test(&set->refs)) {
5226                 kfree(set->name);
5227                 kvfree(set);
5228         }
5229 }
5230
5231 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5232 {
5233         int i;
5234
5235         if (WARN_ON(set->use > 0))
5236                 return;
5237
5238         for (i = 0; i < set->num_exprs; i++)
5239                 nft_expr_destroy(ctx, set->exprs[i]);
5240
5241         set->ops->destroy(ctx, set);
5242         nft_set_catchall_destroy(ctx, set);
5243         nft_set_put(set);
5244 }
5245
5246 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5247                             const struct nlattr * const nla[])
5248 {
5249         struct netlink_ext_ack *extack = info->extack;
5250         u8 genmask = nft_genmask_next(info->net);
5251         u8 family = info->nfmsg->nfgen_family;
5252         struct net *net = info->net;
5253         const struct nlattr *attr;
5254         struct nft_table *table;
5255         struct nft_set *set;
5256         struct nft_ctx ctx;
5257
5258         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5259                 return -EAFNOSUPPORT;
5260
5261         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5262                                  genmask, NETLINK_CB(skb).portid);
5263         if (IS_ERR(table)) {
5264                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5265                 return PTR_ERR(table);
5266         }
5267
5268         if (nla[NFTA_SET_HANDLE]) {
5269                 attr = nla[NFTA_SET_HANDLE];
5270                 set = nft_set_lookup_byhandle(table, attr, genmask);
5271         } else {
5272                 attr = nla[NFTA_SET_NAME];
5273                 set = nft_set_lookup(table, attr, genmask);
5274         }
5275
5276         if (IS_ERR(set)) {
5277                 if (PTR_ERR(set) == -ENOENT &&
5278                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5279                         return 0;
5280
5281                 NL_SET_BAD_ATTR(extack, attr);
5282                 return PTR_ERR(set);
5283         }
5284         if (set->use ||
5285             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5286              atomic_read(&set->nelems) > 0)) {
5287                 NL_SET_BAD_ATTR(extack, attr);
5288                 return -EBUSY;
5289         }
5290
5291         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5292
5293         return nft_delset(&ctx, set);
5294 }
5295
5296 static int nft_validate_register_store(const struct nft_ctx *ctx,
5297                                        enum nft_registers reg,
5298                                        const struct nft_data *data,
5299                                        enum nft_data_types type,
5300                                        unsigned int len);
5301
5302 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5303                                      struct nft_set *set,
5304                                      struct nft_set_elem *elem)
5305 {
5306         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5307         enum nft_registers dreg;
5308
5309         dreg = nft_type_to_reg(set->dtype);
5310         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5311                                            set->dtype == NFT_DATA_VERDICT ?
5312                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5313                                            set->dlen);
5314 }
5315
5316 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5317                                         struct nft_set *set,
5318                                         const struct nft_set_iter *iter,
5319                                         struct nft_set_elem *elem)
5320 {
5321         return nft_setelem_data_validate(ctx, set, elem);
5322 }
5323
5324 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5325                                        struct nft_set *set)
5326 {
5327         u8 genmask = nft_genmask_next(ctx->net);
5328         struct nft_set_elem_catchall *catchall;
5329         struct nft_set_elem elem;
5330         struct nft_set_ext *ext;
5331         int ret = 0;
5332
5333         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5334                 ext = nft_set_elem_ext(set, catchall->elem);
5335                 if (!nft_set_elem_active(ext, genmask))
5336                         continue;
5337
5338                 elem.priv = catchall->elem;
5339                 ret = nft_setelem_data_validate(ctx, set, &elem);
5340                 if (ret < 0)
5341                         break;
5342         }
5343
5344         return ret;
5345 }
5346
5347 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5348                        struct nft_set_binding *binding)
5349 {
5350         struct nft_set_binding *i;
5351         struct nft_set_iter iter;
5352
5353         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5354                 return -EBUSY;
5355
5356         if (binding->flags & NFT_SET_MAP) {
5357                 /* If the set is already bound to the same chain all
5358                  * jumps are already validated for that chain.
5359                  */
5360                 list_for_each_entry(i, &set->bindings, list) {
5361                         if (i->flags & NFT_SET_MAP &&
5362                             i->chain == binding->chain)
5363                                 goto bind;
5364                 }
5365
5366                 iter.genmask    = nft_genmask_next(ctx->net);
5367                 iter.skip       = 0;
5368                 iter.count      = 0;
5369                 iter.err        = 0;
5370                 iter.fn         = nf_tables_bind_check_setelem;
5371
5372                 set->ops->walk(ctx, set, &iter);
5373                 if (!iter.err)
5374                         iter.err = nft_set_catchall_bind_check(ctx, set);
5375
5376                 if (iter.err < 0)
5377                         return iter.err;
5378         }
5379 bind:
5380         if (!nft_use_inc(&set->use))
5381                 return -EMFILE;
5382
5383         binding->chain = ctx->chain;
5384         list_add_tail_rcu(&binding->list, &set->bindings);
5385         nft_set_trans_bind(ctx, set);
5386
5387         return 0;
5388 }
5389 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5390
5391 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5392                                  struct nft_set_binding *binding, bool event)
5393 {
5394         list_del_rcu(&binding->list);
5395
5396         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5397                 list_del_rcu(&set->list);
5398                 if (event)
5399                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5400                                              GFP_KERNEL);
5401         }
5402 }
5403
5404 static void nft_setelem_data_activate(const struct net *net,
5405                                       const struct nft_set *set,
5406                                       struct nft_set_elem *elem);
5407
5408 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5409                                 struct nft_set *set,
5410                                 const struct nft_set_iter *iter,
5411                                 struct nft_set_elem *elem)
5412 {
5413         nft_setelem_data_activate(ctx->net, set, elem);
5414
5415         return 0;
5416 }
5417
5418 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5419                                       struct nft_set *set)
5420 {
5421         u8 genmask = nft_genmask_next(ctx->net);
5422         struct nft_set_elem_catchall *catchall;
5423         struct nft_set_elem elem;
5424         struct nft_set_ext *ext;
5425
5426         list_for_each_entry(catchall, &set->catchall_list, list) {
5427                 ext = nft_set_elem_ext(set, catchall->elem);
5428                 if (!nft_set_elem_active(ext, genmask))
5429                         continue;
5430
5431                 elem.priv = catchall->elem;
5432                 nft_setelem_data_activate(ctx->net, set, &elem);
5433                 break;
5434         }
5435 }
5436
5437 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5438 {
5439         struct nft_set_iter iter = {
5440                 .genmask        = nft_genmask_next(ctx->net),
5441                 .fn             = nft_mapelem_activate,
5442         };
5443
5444         set->ops->walk(ctx, set, &iter);
5445         WARN_ON_ONCE(iter.err);
5446
5447         nft_map_catchall_activate(ctx, set);
5448 }
5449
5450 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5451 {
5452         if (nft_set_is_anonymous(set)) {
5453                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5454                         nft_map_activate(ctx, set);
5455
5456                 nft_clear(ctx->net, set);
5457         }
5458
5459         nft_use_inc_restore(&set->use);
5460 }
5461 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5462
5463 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5464                               struct nft_set_binding *binding,
5465                               enum nft_trans_phase phase)
5466 {
5467         switch (phase) {
5468         case NFT_TRANS_PREPARE_ERROR:
5469                 nft_set_trans_unbind(ctx, set);
5470                 if (nft_set_is_anonymous(set))
5471                         nft_deactivate_next(ctx->net, set);
5472                 else
5473                         list_del_rcu(&binding->list);
5474
5475                 nft_use_dec(&set->use);
5476                 break;
5477         case NFT_TRANS_PREPARE:
5478                 if (nft_set_is_anonymous(set)) {
5479                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5480                                 nft_map_deactivate(ctx, set);
5481
5482                         nft_deactivate_next(ctx->net, set);
5483                 }
5484                 nft_use_dec(&set->use);
5485                 return;
5486         case NFT_TRANS_ABORT:
5487         case NFT_TRANS_RELEASE:
5488                 if (nft_set_is_anonymous(set) &&
5489                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5490                         nft_map_deactivate(ctx, set);
5491
5492                 nft_use_dec(&set->use);
5493                 fallthrough;
5494         default:
5495                 nf_tables_unbind_set(ctx, set, binding,
5496                                      phase == NFT_TRANS_COMMIT);
5497         }
5498 }
5499 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5500
5501 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5502 {
5503         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5504                 nft_set_destroy(ctx, set);
5505 }
5506 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5507
5508 const struct nft_set_ext_type nft_set_ext_types[] = {
5509         [NFT_SET_EXT_KEY]               = {
5510                 .align  = __alignof__(u32),
5511         },
5512         [NFT_SET_EXT_DATA]              = {
5513                 .align  = __alignof__(u32),
5514         },
5515         [NFT_SET_EXT_EXPRESSIONS]       = {
5516                 .align  = __alignof__(struct nft_set_elem_expr),
5517         },
5518         [NFT_SET_EXT_OBJREF]            = {
5519                 .len    = sizeof(struct nft_object *),
5520                 .align  = __alignof__(struct nft_object *),
5521         },
5522         [NFT_SET_EXT_FLAGS]             = {
5523                 .len    = sizeof(u8),
5524                 .align  = __alignof__(u8),
5525         },
5526         [NFT_SET_EXT_TIMEOUT]           = {
5527                 .len    = sizeof(u64),
5528                 .align  = __alignof__(u64),
5529         },
5530         [NFT_SET_EXT_EXPIRATION]        = {
5531                 .len    = sizeof(u64),
5532                 .align  = __alignof__(u64),
5533         },
5534         [NFT_SET_EXT_USERDATA]          = {
5535                 .len    = sizeof(struct nft_userdata),
5536                 .align  = __alignof__(struct nft_userdata),
5537         },
5538         [NFT_SET_EXT_KEY_END]           = {
5539                 .align  = __alignof__(u32),
5540         },
5541 };
5542
5543 /*
5544  * Set elements
5545  */
5546
5547 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5548         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5549         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5550         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5551         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5552         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5553         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5554                                             .len = NFT_USERDATA_MAXLEN },
5555         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5556         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5557                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5558         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5559         [NFTA_SET_ELEM_EXPRESSIONS]     = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
5560 };
5561
5562 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5563         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5564                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5565         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5566                                             .len = NFT_SET_MAXNAMELEN - 1 },
5567         [NFTA_SET_ELEM_LIST_ELEMENTS]   = NLA_POLICY_NESTED_ARRAY(nft_set_elem_policy),
5568         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5569 };
5570
5571 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5572                                   const struct nft_set *set,
5573                                   const struct nft_set_ext *ext,
5574                                   bool reset)
5575 {
5576         struct nft_set_elem_expr *elem_expr;
5577         u32 size, num_exprs = 0;
5578         struct nft_expr *expr;
5579         struct nlattr *nest;
5580
5581         elem_expr = nft_set_ext_expr(ext);
5582         nft_setelem_expr_foreach(expr, elem_expr, size)
5583                 num_exprs++;
5584
5585         if (num_exprs == 1) {
5586                 expr = nft_setelem_expr_at(elem_expr, 0);
5587                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5588                         return -1;
5589
5590                 return 0;
5591         } else if (num_exprs > 1) {
5592                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5593                 if (nest == NULL)
5594                         goto nla_put_failure;
5595
5596                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5597                         expr = nft_setelem_expr_at(elem_expr, size);
5598                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5599                                 goto nla_put_failure;
5600                 }
5601                 nla_nest_end(skb, nest);
5602         }
5603         return 0;
5604
5605 nla_put_failure:
5606         return -1;
5607 }
5608
5609 static int nf_tables_fill_setelem(struct sk_buff *skb,
5610                                   const struct nft_set *set,
5611                                   const struct nft_set_elem *elem,
5612                                   bool reset)
5613 {
5614         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5615         unsigned char *b = skb_tail_pointer(skb);
5616         struct nlattr *nest;
5617
5618         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5619         if (nest == NULL)
5620                 goto nla_put_failure;
5621
5622         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5623             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5624                           NFT_DATA_VALUE, set->klen) < 0)
5625                 goto nla_put_failure;
5626
5627         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5628             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5629                           NFT_DATA_VALUE, set->klen) < 0)
5630                 goto nla_put_failure;
5631
5632         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5633             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5634                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5635                           set->dlen) < 0)
5636                 goto nla_put_failure;
5637
5638         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5639             nft_set_elem_expr_dump(skb, set, ext, reset))
5640                 goto nla_put_failure;
5641
5642         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5643             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5644                            (*nft_set_ext_obj(ext))->key.name) < 0)
5645                 goto nla_put_failure;
5646
5647         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5648             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5649                          htonl(*nft_set_ext_flags(ext))))
5650                 goto nla_put_failure;
5651
5652         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5653             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5654                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5655                          NFTA_SET_ELEM_PAD))
5656                 goto nla_put_failure;
5657
5658         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5659                 u64 expires, now = get_jiffies_64();
5660
5661                 expires = *nft_set_ext_expiration(ext);
5662                 if (time_before64(now, expires))
5663                         expires -= now;
5664                 else
5665                         expires = 0;
5666
5667                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5668                                  nf_jiffies64_to_msecs(expires),
5669                                  NFTA_SET_ELEM_PAD))
5670                         goto nla_put_failure;
5671         }
5672
5673         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5674                 struct nft_userdata *udata;
5675
5676                 udata = nft_set_ext_userdata(ext);
5677                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5678                             udata->len + 1, udata->data))
5679                         goto nla_put_failure;
5680         }
5681
5682         nla_nest_end(skb, nest);
5683         return 0;
5684
5685 nla_put_failure:
5686         nlmsg_trim(skb, b);
5687         return -EMSGSIZE;
5688 }
5689
5690 struct nft_set_dump_args {
5691         const struct netlink_callback   *cb;
5692         struct nft_set_iter             iter;
5693         struct sk_buff                  *skb;
5694         bool                            reset;
5695 };
5696
5697 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5698                                   struct nft_set *set,
5699                                   const struct nft_set_iter *iter,
5700                                   struct nft_set_elem *elem)
5701 {
5702         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5703         struct nft_set_dump_args *args;
5704
5705         if (nft_set_elem_expired(ext))
5706                 return 0;
5707
5708         args = container_of(iter, struct nft_set_dump_args, iter);
5709         return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5710 }
5711
5712 static void audit_log_nft_set_reset(const struct nft_table *table,
5713                                     unsigned int base_seq,
5714                                     unsigned int nentries)
5715 {
5716         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5717
5718         audit_log_nfcfg(buf, table->family, nentries,
5719                         AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5720         kfree(buf);
5721 }
5722
5723 struct nft_set_dump_ctx {
5724         const struct nft_set    *set;
5725         struct nft_ctx          ctx;
5726 };
5727
5728 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5729                                  const struct nft_set *set, bool reset,
5730                                  unsigned int base_seq)
5731 {
5732         struct nft_set_elem_catchall *catchall;
5733         u8 genmask = nft_genmask_cur(net);
5734         struct nft_set_elem elem;
5735         struct nft_set_ext *ext;
5736         int ret = 0;
5737
5738         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5739                 ext = nft_set_elem_ext(set, catchall->elem);
5740                 if (!nft_set_elem_active(ext, genmask) ||
5741                     nft_set_elem_expired(ext))
5742                         continue;
5743
5744                 elem.priv = catchall->elem;
5745                 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5746                 if (reset && !ret)
5747                         audit_log_nft_set_reset(set->table, base_seq, 1);
5748                 break;
5749         }
5750
5751         return ret;
5752 }
5753
5754 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5755 {
5756         struct nft_set_dump_ctx *dump_ctx = cb->data;
5757         struct net *net = sock_net(skb->sk);
5758         struct nftables_pernet *nft_net;
5759         struct nft_table *table;
5760         struct nft_set *set;
5761         struct nft_set_dump_args args;
5762         bool set_found = false;
5763         struct nlmsghdr *nlh;
5764         struct nlattr *nest;
5765         bool reset = false;
5766         u32 portid, seq;
5767         int event;
5768
5769         rcu_read_lock();
5770         nft_net = nft_pernet(net);
5771         cb->seq = READ_ONCE(nft_net->base_seq);
5772
5773         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5774                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5775                     dump_ctx->ctx.family != table->family)
5776                         continue;
5777
5778                 if (table != dump_ctx->ctx.table)
5779                         continue;
5780
5781                 list_for_each_entry_rcu(set, &table->sets, list) {
5782                         if (set == dump_ctx->set) {
5783                                 set_found = true;
5784                                 break;
5785                         }
5786                 }
5787                 break;
5788         }
5789
5790         if (!set_found) {
5791                 rcu_read_unlock();
5792                 return -ENOENT;
5793         }
5794
5795         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5796         portid = NETLINK_CB(cb->skb).portid;
5797         seq    = cb->nlh->nlmsg_seq;
5798
5799         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5800                            table->family, NFNETLINK_V0, nft_base_seq(net));
5801         if (!nlh)
5802                 goto nla_put_failure;
5803
5804         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5805                 goto nla_put_failure;
5806         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5807                 goto nla_put_failure;
5808
5809         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5810         if (nest == NULL)
5811                 goto nla_put_failure;
5812
5813         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5814                 reset = true;
5815
5816         args.cb                 = cb;
5817         args.skb                = skb;
5818         args.reset              = reset;
5819         args.iter.genmask       = nft_genmask_cur(net);
5820         args.iter.skip          = cb->args[0];
5821         args.iter.count         = 0;
5822         args.iter.err           = 0;
5823         args.iter.fn            = nf_tables_dump_setelem;
5824         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5825
5826         if (!args.iter.err && args.iter.count == cb->args[0])
5827                 args.iter.err = nft_set_catchall_dump(net, skb, set,
5828                                                       reset, cb->seq);
5829         nla_nest_end(skb, nest);
5830         nlmsg_end(skb, nlh);
5831
5832         if (reset && args.iter.count > args.iter.skip)
5833                 audit_log_nft_set_reset(table, cb->seq,
5834                                         args.iter.count - args.iter.skip);
5835
5836         rcu_read_unlock();
5837
5838         if (args.iter.err && args.iter.err != -EMSGSIZE)
5839                 return args.iter.err;
5840         if (args.iter.count == cb->args[0])
5841                 return 0;
5842
5843         cb->args[0] = args.iter.count;
5844         return skb->len;
5845
5846 nla_put_failure:
5847         rcu_read_unlock();
5848         return -ENOSPC;
5849 }
5850
5851 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5852 {
5853         struct nft_set_dump_ctx *dump_ctx = cb->data;
5854
5855         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5856
5857         return cb->data ? 0 : -ENOMEM;
5858 }
5859
5860 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5861 {
5862         kfree(cb->data);
5863         return 0;
5864 }
5865
5866 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5867                                        const struct nft_ctx *ctx, u32 seq,
5868                                        u32 portid, int event, u16 flags,
5869                                        const struct nft_set *set,
5870                                        const struct nft_set_elem *elem,
5871                                        bool reset)
5872 {
5873         struct nlmsghdr *nlh;
5874         struct nlattr *nest;
5875         int err;
5876
5877         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5878         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5879                            NFNETLINK_V0, nft_base_seq(ctx->net));
5880         if (!nlh)
5881                 goto nla_put_failure;
5882
5883         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5884                 goto nla_put_failure;
5885         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5886                 goto nla_put_failure;
5887
5888         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5889         if (nest == NULL)
5890                 goto nla_put_failure;
5891
5892         err = nf_tables_fill_setelem(skb, set, elem, reset);
5893         if (err < 0)
5894                 goto nla_put_failure;
5895
5896         nla_nest_end(skb, nest);
5897
5898         nlmsg_end(skb, nlh);
5899         return 0;
5900
5901 nla_put_failure:
5902         nlmsg_trim(skb, nlh);
5903         return -1;
5904 }
5905
5906 static int nft_setelem_parse_flags(const struct nft_set *set,
5907                                    const struct nlattr *attr, u32 *flags)
5908 {
5909         if (attr == NULL)
5910                 return 0;
5911
5912         *flags = ntohl(nla_get_be32(attr));
5913         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5914                 return -EOPNOTSUPP;
5915         if (!(set->flags & NFT_SET_INTERVAL) &&
5916             *flags & NFT_SET_ELEM_INTERVAL_END)
5917                 return -EINVAL;
5918         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5919             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5920                 return -EINVAL;
5921
5922         return 0;
5923 }
5924
5925 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5926                                  struct nft_data *key, struct nlattr *attr)
5927 {
5928         struct nft_data_desc desc = {
5929                 .type   = NFT_DATA_VALUE,
5930                 .size   = NFT_DATA_VALUE_MAXLEN,
5931                 .len    = set->klen,
5932         };
5933
5934         return nft_data_init(ctx, key, &desc, attr);
5935 }
5936
5937 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5938                                   struct nft_data_desc *desc,
5939                                   struct nft_data *data,
5940                                   struct nlattr *attr)
5941 {
5942         u32 dtype;
5943
5944         if (set->dtype == NFT_DATA_VERDICT)
5945                 dtype = NFT_DATA_VERDICT;
5946         else
5947                 dtype = NFT_DATA_VALUE;
5948
5949         desc->type = dtype;
5950         desc->size = NFT_DATA_VALUE_MAXLEN;
5951         desc->len = set->dlen;
5952         desc->flags = NFT_DATA_DESC_SETELEM;
5953
5954         return nft_data_init(ctx, data, desc, attr);
5955 }
5956
5957 static void *nft_setelem_catchall_get(const struct net *net,
5958                                       const struct nft_set *set)
5959 {
5960         struct nft_set_elem_catchall *catchall;
5961         u8 genmask = nft_genmask_cur(net);
5962         struct nft_set_ext *ext;
5963         void *priv = NULL;
5964
5965         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5966                 ext = nft_set_elem_ext(set, catchall->elem);
5967                 if (!nft_set_elem_active(ext, genmask) ||
5968                     nft_set_elem_expired(ext))
5969                         continue;
5970
5971                 priv = catchall->elem;
5972                 break;
5973         }
5974
5975         return priv;
5976 }
5977
5978 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5979                            struct nft_set_elem *elem, u32 flags)
5980 {
5981         void *priv;
5982
5983         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5984                 priv = set->ops->get(ctx->net, set, elem, flags);
5985                 if (IS_ERR(priv))
5986                         return PTR_ERR(priv);
5987         } else {
5988                 priv = nft_setelem_catchall_get(ctx->net, set);
5989                 if (!priv)
5990                         return -ENOENT;
5991         }
5992         elem->priv = priv;
5993
5994         return 0;
5995 }
5996
5997 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5998                             const struct nlattr *attr, bool reset)
5999 {
6000         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6001         struct nft_set_elem elem;
6002         struct sk_buff *skb;
6003         uint32_t flags = 0;
6004         int err;
6005
6006         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6007                                           nft_set_elem_policy, NULL);
6008         if (err < 0)
6009                 return err;
6010
6011         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6012         if (err < 0)
6013                 return err;
6014
6015         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6016                 return -EINVAL;
6017
6018         if (nla[NFTA_SET_ELEM_KEY]) {
6019                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6020                                             nla[NFTA_SET_ELEM_KEY]);
6021                 if (err < 0)
6022                         return err;
6023         }
6024
6025         if (nla[NFTA_SET_ELEM_KEY_END]) {
6026                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6027                                             nla[NFTA_SET_ELEM_KEY_END]);
6028                 if (err < 0)
6029                         return err;
6030         }
6031
6032         err = nft_setelem_get(ctx, set, &elem, flags);
6033         if (err < 0)
6034                 return err;
6035
6036         err = -ENOMEM;
6037         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6038         if (skb == NULL)
6039                 return err;
6040
6041         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6042                                           NFT_MSG_NEWSETELEM, 0, set, &elem,
6043                                           reset);
6044         if (err < 0)
6045                 goto err_fill_setelem;
6046
6047         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6048
6049 err_fill_setelem:
6050         kfree_skb(skb);
6051         return err;
6052 }
6053
6054 /* called with rcu_read_lock held */
6055 static int nf_tables_getsetelem(struct sk_buff *skb,
6056                                 const struct nfnl_info *info,
6057                                 const struct nlattr * const nla[])
6058 {
6059         struct netlink_ext_ack *extack = info->extack;
6060         u8 genmask = nft_genmask_cur(info->net);
6061         u8 family = info->nfmsg->nfgen_family;
6062         int rem, err = 0, nelems = 0;
6063         struct net *net = info->net;
6064         struct nft_table *table;
6065         struct nft_set *set;
6066         struct nlattr *attr;
6067         struct nft_ctx ctx;
6068         bool reset = false;
6069
6070         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6071                                  genmask, 0);
6072         if (IS_ERR(table)) {
6073                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6074                 return PTR_ERR(table);
6075         }
6076
6077         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6078         if (IS_ERR(set)) {
6079                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
6080                 return PTR_ERR(set);
6081         }
6082
6083         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6084
6085         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6086                 struct netlink_dump_control c = {
6087                         .start = nf_tables_dump_set_start,
6088                         .dump = nf_tables_dump_set,
6089                         .done = nf_tables_dump_set_done,
6090                         .module = THIS_MODULE,
6091                 };
6092                 struct nft_set_dump_ctx dump_ctx = {
6093                         .set = set,
6094                         .ctx = ctx,
6095                 };
6096
6097                 c.data = &dump_ctx;
6098                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6099         }
6100
6101         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6102                 return -EINVAL;
6103
6104         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6105                 reset = true;
6106
6107         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6108                 err = nft_get_set_elem(&ctx, set, attr, reset);
6109                 if (err < 0) {
6110                         NL_SET_BAD_ATTR(extack, attr);
6111                         break;
6112                 }
6113                 nelems++;
6114         }
6115
6116         if (reset)
6117                 audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6118                                         nelems);
6119
6120         return err;
6121 }
6122
6123 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6124                                      const struct nft_set *set,
6125                                      const struct nft_set_elem *elem,
6126                                      int event)
6127 {
6128         struct nftables_pernet *nft_net;
6129         struct net *net = ctx->net;
6130         u32 portid = ctx->portid;
6131         struct sk_buff *skb;
6132         u16 flags = 0;
6133         int err;
6134
6135         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6136                 return;
6137
6138         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6139         if (skb == NULL)
6140                 goto err;
6141
6142         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6143                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6144
6145         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6146                                           set, elem, false);
6147         if (err < 0) {
6148                 kfree_skb(skb);
6149                 goto err;
6150         }
6151
6152         nft_net = nft_pernet(net);
6153         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6154         return;
6155 err:
6156         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6157 }
6158
6159 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6160                                               int msg_type,
6161                                               struct nft_set *set)
6162 {
6163         struct nft_trans *trans;
6164
6165         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6166         if (trans == NULL)
6167                 return NULL;
6168
6169         nft_trans_elem_set(trans) = set;
6170         return trans;
6171 }
6172
6173 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6174                                          const struct nft_set *set,
6175                                          const struct nlattr *attr)
6176 {
6177         struct nft_expr *expr;
6178         int err;
6179
6180         expr = nft_expr_init(ctx, attr);
6181         if (IS_ERR(expr))
6182                 return expr;
6183
6184         err = -EOPNOTSUPP;
6185         if (expr->ops->type->flags & NFT_EXPR_GC) {
6186                 if (set->flags & NFT_SET_TIMEOUT)
6187                         goto err_set_elem_expr;
6188                 if (!set->ops->gc_init)
6189                         goto err_set_elem_expr;
6190                 set->ops->gc_init(set);
6191         }
6192
6193         return expr;
6194
6195 err_set_elem_expr:
6196         nft_expr_destroy(ctx, expr);
6197         return ERR_PTR(err);
6198 }
6199
6200 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6201 {
6202         len += nft_set_ext_types[id].len;
6203         if (len > tmpl->ext_len[id] ||
6204             len > U8_MAX)
6205                 return -1;
6206
6207         return 0;
6208 }
6209
6210 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6211                               void *to, const void *from, u32 len)
6212 {
6213         if (nft_set_ext_check(tmpl, id, len) < 0)
6214                 return -1;
6215
6216         memcpy(to, from, len);
6217
6218         return 0;
6219 }
6220
6221 void *nft_set_elem_init(const struct nft_set *set,
6222                         const struct nft_set_ext_tmpl *tmpl,
6223                         const u32 *key, const u32 *key_end,
6224                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6225 {
6226         struct nft_set_ext *ext;
6227         void *elem;
6228
6229         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6230         if (elem == NULL)
6231                 return ERR_PTR(-ENOMEM);
6232
6233         ext = nft_set_elem_ext(set, elem);
6234         nft_set_ext_init(ext, tmpl);
6235
6236         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6237             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6238                                nft_set_ext_key(ext), key, set->klen) < 0)
6239                 goto err_ext_check;
6240
6241         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6242             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6243                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6244                 goto err_ext_check;
6245
6246         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6247             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6248                                nft_set_ext_data(ext), data, set->dlen) < 0)
6249                 goto err_ext_check;
6250
6251         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6252                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6253                 if (expiration == 0)
6254                         *nft_set_ext_expiration(ext) += timeout;
6255         }
6256         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6257                 *nft_set_ext_timeout(ext) = timeout;
6258
6259         return elem;
6260
6261 err_ext_check:
6262         kfree(elem);
6263
6264         return ERR_PTR(-EINVAL);
6265 }
6266
6267 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6268                                         struct nft_expr *expr)
6269 {
6270         if (expr->ops->destroy_clone) {
6271                 expr->ops->destroy_clone(ctx, expr);
6272                 module_put(expr->ops->type->owner);
6273         } else {
6274                 nf_tables_expr_destroy(ctx, expr);
6275         }
6276 }
6277
6278 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6279                                       struct nft_set_elem_expr *elem_expr)
6280 {
6281         struct nft_expr *expr;
6282         u32 size;
6283
6284         nft_setelem_expr_foreach(expr, elem_expr, size)
6285                 __nft_set_elem_expr_destroy(ctx, expr);
6286 }
6287
6288 /* Drop references and destroy. Called from gc, dynset and abort path. */
6289 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6290                           bool destroy_expr)
6291 {
6292         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6293         struct nft_ctx ctx = {
6294                 .net    = read_pnet(&set->net),
6295                 .family = set->table->family,
6296         };
6297
6298         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6299         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6300                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6301         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6302                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6303
6304         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6305                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6306         kfree(elem);
6307 }
6308 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6309
6310 /* Destroy element. References have been already dropped in the preparation
6311  * path via nft_setelem_data_deactivate().
6312  */
6313 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6314                                 const struct nft_set *set, void *elem)
6315 {
6316         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6317
6318         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6319                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6320
6321         kfree(elem);
6322 }
6323
6324 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6325                             struct nft_expr *expr_array[])
6326 {
6327         struct nft_expr *expr;
6328         int err, i, k;
6329
6330         for (i = 0; i < set->num_exprs; i++) {
6331                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6332                 if (!expr)
6333                         goto err_expr;
6334
6335                 err = nft_expr_clone(expr, set->exprs[i]);
6336                 if (err < 0) {
6337                         kfree(expr);
6338                         goto err_expr;
6339                 }
6340                 expr_array[i] = expr;
6341         }
6342
6343         return 0;
6344
6345 err_expr:
6346         for (k = i - 1; k >= 0; k--)
6347                 nft_expr_destroy(ctx, expr_array[k]);
6348
6349         return -ENOMEM;
6350 }
6351
6352 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6353                                    const struct nft_set_ext_tmpl *tmpl,
6354                                    const struct nft_set_ext *ext,
6355                                    struct nft_expr *expr_array[],
6356                                    u32 num_exprs)
6357 {
6358         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6359         u32 len = sizeof(struct nft_set_elem_expr);
6360         struct nft_expr *expr;
6361         int i, err;
6362
6363         if (num_exprs == 0)
6364                 return 0;
6365
6366         for (i = 0; i < num_exprs; i++)
6367                 len += expr_array[i]->ops->size;
6368
6369         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6370                 return -EINVAL;
6371
6372         for (i = 0; i < num_exprs; i++) {
6373                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6374                 err = nft_expr_clone(expr, expr_array[i]);
6375                 if (err < 0)
6376                         goto err_elem_expr_setup;
6377
6378                 elem_expr->size += expr_array[i]->ops->size;
6379                 nft_expr_destroy(ctx, expr_array[i]);
6380                 expr_array[i] = NULL;
6381         }
6382
6383         return 0;
6384
6385 err_elem_expr_setup:
6386         for (; i < num_exprs; i++) {
6387                 nft_expr_destroy(ctx, expr_array[i]);
6388                 expr_array[i] = NULL;
6389         }
6390
6391         return -ENOMEM;
6392 }
6393
6394 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6395                                             const struct nft_set *set)
6396 {
6397         struct nft_set_elem_catchall *catchall;
6398         u8 genmask = nft_genmask_cur(net);
6399         struct nft_set_ext *ext;
6400
6401         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6402                 ext = nft_set_elem_ext(set, catchall->elem);
6403                 if (nft_set_elem_active(ext, genmask) &&
6404                     !nft_set_elem_expired(ext) &&
6405                     !nft_set_elem_is_dead(ext))
6406                         return ext;
6407         }
6408
6409         return NULL;
6410 }
6411 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6412
6413 static int nft_setelem_catchall_insert(const struct net *net,
6414                                        struct nft_set *set,
6415                                        const struct nft_set_elem *elem,
6416                                        struct nft_set_ext **pext)
6417 {
6418         struct nft_set_elem_catchall *catchall;
6419         u8 genmask = nft_genmask_next(net);
6420         struct nft_set_ext *ext;
6421
6422         list_for_each_entry(catchall, &set->catchall_list, list) {
6423                 ext = nft_set_elem_ext(set, catchall->elem);
6424                 if (nft_set_elem_active(ext, genmask)) {
6425                         *pext = ext;
6426                         return -EEXIST;
6427                 }
6428         }
6429
6430         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6431         if (!catchall)
6432                 return -ENOMEM;
6433
6434         catchall->elem = elem->priv;
6435         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6436
6437         return 0;
6438 }
6439
6440 static int nft_setelem_insert(const struct net *net,
6441                               struct nft_set *set,
6442                               const struct nft_set_elem *elem,
6443                               struct nft_set_ext **ext, unsigned int flags)
6444 {
6445         int ret;
6446
6447         if (flags & NFT_SET_ELEM_CATCHALL)
6448                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6449         else
6450                 ret = set->ops->insert(net, set, elem, ext);
6451
6452         return ret;
6453 }
6454
6455 static bool nft_setelem_is_catchall(const struct nft_set *set,
6456                                     const struct nft_set_elem *elem)
6457 {
6458         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6459
6460         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6461             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6462                 return true;
6463
6464         return false;
6465 }
6466
6467 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6468                                  struct nft_set_elem *elem)
6469 {
6470         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6471
6472         if (nft_setelem_is_catchall(set, elem)) {
6473                 nft_set_elem_change_active(net, set, ext);
6474         } else {
6475                 set->ops->activate(net, set, elem);
6476         }
6477 }
6478
6479 static int nft_setelem_catchall_deactivate(const struct net *net,
6480                                            struct nft_set *set,
6481                                            struct nft_set_elem *elem)
6482 {
6483         struct nft_set_elem_catchall *catchall;
6484         struct nft_set_ext *ext;
6485
6486         list_for_each_entry(catchall, &set->catchall_list, list) {
6487                 ext = nft_set_elem_ext(set, catchall->elem);
6488                 if (!nft_is_active(net, ext))
6489                         continue;
6490
6491                 kfree(elem->priv);
6492                 elem->priv = catchall->elem;
6493                 nft_set_elem_change_active(net, set, ext);
6494                 return 0;
6495         }
6496
6497         return -ENOENT;
6498 }
6499
6500 static int __nft_setelem_deactivate(const struct net *net,
6501                                     struct nft_set *set,
6502                                     struct nft_set_elem *elem)
6503 {
6504         void *priv;
6505
6506         priv = set->ops->deactivate(net, set, elem);
6507         if (!priv)
6508                 return -ENOENT;
6509
6510         kfree(elem->priv);
6511         elem->priv = priv;
6512         set->ndeact++;
6513
6514         return 0;
6515 }
6516
6517 static int nft_setelem_deactivate(const struct net *net,
6518                                   struct nft_set *set,
6519                                   struct nft_set_elem *elem, u32 flags)
6520 {
6521         int ret;
6522
6523         if (flags & NFT_SET_ELEM_CATCHALL)
6524                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6525         else
6526                 ret = __nft_setelem_deactivate(net, set, elem);
6527
6528         return ret;
6529 }
6530
6531 static void nft_setelem_catchall_remove(const struct net *net,
6532                                         const struct nft_set *set,
6533                                         const struct nft_set_elem *elem)
6534 {
6535         struct nft_set_elem_catchall *catchall, *next;
6536
6537         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6538                 if (catchall->elem == elem->priv) {
6539                         list_del_rcu(&catchall->list);
6540                         kfree_rcu(catchall, rcu);
6541                         break;
6542                 }
6543         }
6544 }
6545
6546 static void nft_setelem_remove(const struct net *net,
6547                                const struct nft_set *set,
6548                                const struct nft_set_elem *elem)
6549 {
6550         if (nft_setelem_is_catchall(set, elem))
6551                 nft_setelem_catchall_remove(net, set, elem);
6552         else
6553                 set->ops->remove(net, set, elem);
6554 }
6555
6556 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6557                                       struct nlattr **nla, u32 flags)
6558 {
6559         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6560                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6561                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6562                         return false;
6563
6564                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6565                     flags & NFT_SET_ELEM_CATCHALL)
6566                         return false;
6567         } else {
6568                 if (nla[NFTA_SET_ELEM_KEY_END])
6569                         return false;
6570         }
6571
6572         return true;
6573 }
6574
6575 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6576                             const struct nlattr *attr, u32 nlmsg_flags)
6577 {
6578         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6579         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6580         u8 genmask = nft_genmask_next(ctx->net);
6581         u32 flags = 0, size = 0, num_exprs = 0;
6582         struct nft_set_ext_tmpl tmpl;
6583         struct nft_set_ext *ext, *ext2;
6584         struct nft_set_elem elem;
6585         struct nft_set_binding *binding;
6586         struct nft_object *obj = NULL;
6587         struct nft_userdata *udata;
6588         struct nft_data_desc desc;
6589         enum nft_registers dreg;
6590         struct nft_trans *trans;
6591         u64 timeout;
6592         u64 expiration;
6593         int err, i;
6594         u8 ulen;
6595
6596         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6597                                           nft_set_elem_policy, NULL);
6598         if (err < 0)
6599                 return err;
6600
6601         nft_set_ext_prepare(&tmpl);
6602
6603         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6604         if (err < 0)
6605                 return err;
6606
6607         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6608             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6609                 return -EINVAL;
6610
6611         if (flags != 0) {
6612                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6613                 if (err < 0)
6614                         return err;
6615         }
6616
6617         if (set->flags & NFT_SET_MAP) {
6618                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6619                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6620                         return -EINVAL;
6621         } else {
6622                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6623                         return -EINVAL;
6624         }
6625
6626         if (set->flags & NFT_SET_OBJECT) {
6627                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6628                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6629                         return -EINVAL;
6630         } else {
6631                 if (nla[NFTA_SET_ELEM_OBJREF])
6632                         return -EINVAL;
6633         }
6634
6635         if (!nft_setelem_valid_key_end(set, nla, flags))
6636                 return -EINVAL;
6637
6638         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6639              (nla[NFTA_SET_ELEM_DATA] ||
6640               nla[NFTA_SET_ELEM_OBJREF] ||
6641               nla[NFTA_SET_ELEM_TIMEOUT] ||
6642               nla[NFTA_SET_ELEM_EXPIRATION] ||
6643               nla[NFTA_SET_ELEM_USERDATA] ||
6644               nla[NFTA_SET_ELEM_EXPR] ||
6645               nla[NFTA_SET_ELEM_KEY_END] ||
6646               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6647                 return -EINVAL;
6648
6649         timeout = 0;
6650         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6651                 if (!(set->flags & NFT_SET_TIMEOUT))
6652                         return -EINVAL;
6653                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6654                                             &timeout);
6655                 if (err)
6656                         return err;
6657         } else if (set->flags & NFT_SET_TIMEOUT &&
6658                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6659                 timeout = READ_ONCE(set->timeout);
6660         }
6661
6662         expiration = 0;
6663         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6664                 if (!(set->flags & NFT_SET_TIMEOUT))
6665                         return -EINVAL;
6666                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6667                                             &expiration);
6668                 if (err)
6669                         return err;
6670         }
6671
6672         if (nla[NFTA_SET_ELEM_EXPR]) {
6673                 struct nft_expr *expr;
6674
6675                 if (set->num_exprs && set->num_exprs != 1)
6676                         return -EOPNOTSUPP;
6677
6678                 expr = nft_set_elem_expr_alloc(ctx, set,
6679                                                nla[NFTA_SET_ELEM_EXPR]);
6680                 if (IS_ERR(expr))
6681                         return PTR_ERR(expr);
6682
6683                 expr_array[0] = expr;
6684                 num_exprs = 1;
6685
6686                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6687                         err = -EOPNOTSUPP;
6688                         goto err_set_elem_expr;
6689                 }
6690         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6691                 struct nft_expr *expr;
6692                 struct nlattr *tmp;
6693                 int left;
6694
6695                 i = 0;
6696                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6697                         if (i == NFT_SET_EXPR_MAX ||
6698                             (set->num_exprs && set->num_exprs == i)) {
6699                                 err = -E2BIG;
6700                                 goto err_set_elem_expr;
6701                         }
6702                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6703                                 err = -EINVAL;
6704                                 goto err_set_elem_expr;
6705                         }
6706                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6707                         if (IS_ERR(expr)) {
6708                                 err = PTR_ERR(expr);
6709                                 goto err_set_elem_expr;
6710                         }
6711                         expr_array[i] = expr;
6712                         num_exprs++;
6713
6714                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6715                                 err = -EOPNOTSUPP;
6716                                 goto err_set_elem_expr;
6717                         }
6718                         i++;
6719                 }
6720                 if (set->num_exprs && set->num_exprs != i) {
6721                         err = -EOPNOTSUPP;
6722                         goto err_set_elem_expr;
6723                 }
6724         } else if (set->num_exprs > 0 &&
6725                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6726                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6727                 if (err < 0)
6728                         goto err_set_elem_expr_clone;
6729
6730                 num_exprs = set->num_exprs;
6731         }
6732
6733         if (nla[NFTA_SET_ELEM_KEY]) {
6734                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6735                                             nla[NFTA_SET_ELEM_KEY]);
6736                 if (err < 0)
6737                         goto err_set_elem_expr;
6738
6739                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6740                 if (err < 0)
6741                         goto err_parse_key;
6742         }
6743
6744         if (nla[NFTA_SET_ELEM_KEY_END]) {
6745                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6746                                             nla[NFTA_SET_ELEM_KEY_END]);
6747                 if (err < 0)
6748                         goto err_parse_key;
6749
6750                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6751                 if (err < 0)
6752                         goto err_parse_key_end;
6753         }
6754
6755         if (timeout > 0) {
6756                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6757                 if (err < 0)
6758                         goto err_parse_key_end;
6759
6760                 if (timeout != READ_ONCE(set->timeout)) {
6761                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6762                         if (err < 0)
6763                                 goto err_parse_key_end;
6764                 }
6765         }
6766
6767         if (num_exprs) {
6768                 for (i = 0; i < num_exprs; i++)
6769                         size += expr_array[i]->ops->size;
6770
6771                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6772                                              sizeof(struct nft_set_elem_expr) + size);
6773                 if (err < 0)
6774                         goto err_parse_key_end;
6775         }
6776
6777         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6778                 obj = nft_obj_lookup(ctx->net, ctx->table,
6779                                      nla[NFTA_SET_ELEM_OBJREF],
6780                                      set->objtype, genmask);
6781                 if (IS_ERR(obj)) {
6782                         err = PTR_ERR(obj);
6783                         obj = NULL;
6784                         goto err_parse_key_end;
6785                 }
6786
6787                 if (!nft_use_inc(&obj->use)) {
6788                         err = -EMFILE;
6789                         obj = NULL;
6790                         goto err_parse_key_end;
6791                 }
6792
6793                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6794                 if (err < 0)
6795                         goto err_parse_key_end;
6796         }
6797
6798         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6799                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6800                                              nla[NFTA_SET_ELEM_DATA]);
6801                 if (err < 0)
6802                         goto err_parse_key_end;
6803
6804                 dreg = nft_type_to_reg(set->dtype);
6805                 list_for_each_entry(binding, &set->bindings, list) {
6806                         struct nft_ctx bind_ctx = {
6807                                 .net    = ctx->net,
6808                                 .family = ctx->family,
6809                                 .table  = ctx->table,
6810                                 .chain  = (struct nft_chain *)binding->chain,
6811                         };
6812
6813                         if (!(binding->flags & NFT_SET_MAP))
6814                                 continue;
6815
6816                         err = nft_validate_register_store(&bind_ctx, dreg,
6817                                                           &elem.data.val,
6818                                                           desc.type, desc.len);
6819                         if (err < 0)
6820                                 goto err_parse_data;
6821
6822                         if (desc.type == NFT_DATA_VERDICT &&
6823                             (elem.data.val.verdict.code == NFT_GOTO ||
6824                              elem.data.val.verdict.code == NFT_JUMP))
6825                                 nft_validate_state_update(ctx->table,
6826                                                           NFT_VALIDATE_NEED);
6827                 }
6828
6829                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6830                 if (err < 0)
6831                         goto err_parse_data;
6832         }
6833
6834         /* The full maximum length of userdata can exceed the maximum
6835          * offset value (U8_MAX) for following extensions, therefor it
6836          * must be the last extension added.
6837          */
6838         ulen = 0;
6839         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6840                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6841                 if (ulen > 0) {
6842                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6843                                                      ulen);
6844                         if (err < 0)
6845                                 goto err_parse_data;
6846                 }
6847         }
6848
6849         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6850                                       elem.key_end.val.data, elem.data.val.data,
6851                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6852         if (IS_ERR(elem.priv)) {
6853                 err = PTR_ERR(elem.priv);
6854                 goto err_parse_data;
6855         }
6856
6857         ext = nft_set_elem_ext(set, elem.priv);
6858         if (flags)
6859                 *nft_set_ext_flags(ext) = flags;
6860
6861         if (obj)
6862                 *nft_set_ext_obj(ext) = obj;
6863
6864         if (ulen > 0) {
6865                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6866                         err = -EINVAL;
6867                         goto err_elem_free;
6868                 }
6869                 udata = nft_set_ext_userdata(ext);
6870                 udata->len = ulen - 1;
6871                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6872         }
6873         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6874         if (err < 0)
6875                 goto err_elem_free;
6876
6877         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6878         if (trans == NULL) {
6879                 err = -ENOMEM;
6880                 goto err_elem_free;
6881         }
6882
6883         ext->genmask = nft_genmask_cur(ctx->net);
6884
6885         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6886         if (err) {
6887                 if (err == -EEXIST) {
6888                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6889                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6890                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6891                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6892                                 goto err_element_clash;
6893                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6894                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6895                              memcmp(nft_set_ext_data(ext),
6896                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6897                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6898                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6899                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6900                                 goto err_element_clash;
6901                         else if (!(nlmsg_flags & NLM_F_EXCL))
6902                                 err = 0;
6903                 } else if (err == -ENOTEMPTY) {
6904                         /* ENOTEMPTY reports overlapping between this element
6905                          * and an existing one.
6906                          */
6907                         err = -EEXIST;
6908                 }
6909                 goto err_element_clash;
6910         }
6911
6912         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6913                 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6914
6915                 if (!atomic_add_unless(&set->nelems, 1, max)) {
6916                         err = -ENFILE;
6917                         goto err_set_full;
6918                 }
6919         }
6920
6921         nft_trans_elem(trans) = elem;
6922         nft_trans_commit_list_add_tail(ctx->net, trans);
6923         return 0;
6924
6925 err_set_full:
6926         nft_setelem_remove(ctx->net, set, &elem);
6927 err_element_clash:
6928         kfree(trans);
6929 err_elem_free:
6930         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6931 err_parse_data:
6932         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6933                 nft_data_release(&elem.data.val, desc.type);
6934 err_parse_key_end:
6935         if (obj)
6936                 nft_use_dec_restore(&obj->use);
6937
6938         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6939 err_parse_key:
6940         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6941 err_set_elem_expr:
6942         for (i = 0; i < num_exprs && expr_array[i]; i++)
6943                 nft_expr_destroy(ctx, expr_array[i]);
6944 err_set_elem_expr_clone:
6945         return err;
6946 }
6947
6948 static int nf_tables_newsetelem(struct sk_buff *skb,
6949                                 const struct nfnl_info *info,
6950                                 const struct nlattr * const nla[])
6951 {
6952         struct netlink_ext_ack *extack = info->extack;
6953         u8 genmask = nft_genmask_next(info->net);
6954         u8 family = info->nfmsg->nfgen_family;
6955         struct net *net = info->net;
6956         const struct nlattr *attr;
6957         struct nft_table *table;
6958         struct nft_set *set;
6959         struct nft_ctx ctx;
6960         int rem, err;
6961
6962         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6963                 return -EINVAL;
6964
6965         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6966                                  genmask, NETLINK_CB(skb).portid);
6967         if (IS_ERR(table)) {
6968                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6969                 return PTR_ERR(table);
6970         }
6971
6972         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6973                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6974         if (IS_ERR(set)) {
6975                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
6976                 return PTR_ERR(set);
6977         }
6978
6979         if (!list_empty(&set->bindings) &&
6980             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6981                 return -EBUSY;
6982
6983         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6984
6985         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6986                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6987                 if (err < 0) {
6988                         NL_SET_BAD_ATTR(extack, attr);
6989                         return err;
6990                 }
6991         }
6992
6993         if (table->validate_state == NFT_VALIDATE_DO)
6994                 return nft_table_validate(net, table);
6995
6996         return 0;
6997 }
6998
6999 /**
7000  *      nft_data_hold - hold a nft_data item
7001  *
7002  *      @data: struct nft_data to release
7003  *      @type: type of data
7004  *
7005  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7006  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
7007  *      NFT_GOTO verdicts. This function must be called on active data objects
7008  *      from the second phase of the commit protocol.
7009  */
7010 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
7011 {
7012         struct nft_chain *chain;
7013
7014         if (type == NFT_DATA_VERDICT) {
7015                 switch (data->verdict.code) {
7016                 case NFT_JUMP:
7017                 case NFT_GOTO:
7018                         chain = data->verdict.chain;
7019                         nft_use_inc_restore(&chain->use);
7020                         break;
7021                 }
7022         }
7023 }
7024
7025 static void nft_setelem_data_activate(const struct net *net,
7026                                       const struct nft_set *set,
7027                                       struct nft_set_elem *elem)
7028 {
7029         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7030
7031         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7032                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
7033         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7034                 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7035 }
7036
7037 void nft_setelem_data_deactivate(const struct net *net,
7038                                  const struct nft_set *set,
7039                                  struct nft_set_elem *elem)
7040 {
7041         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7042
7043         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7044                 nft_data_release(nft_set_ext_data(ext), set->dtype);
7045         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7046                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7047 }
7048
7049 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7050                            const struct nlattr *attr)
7051 {
7052         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7053         struct nft_set_ext_tmpl tmpl;
7054         struct nft_set_elem elem;
7055         struct nft_set_ext *ext;
7056         struct nft_trans *trans;
7057         u32 flags = 0;
7058         int err;
7059
7060         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7061                                           nft_set_elem_policy, NULL);
7062         if (err < 0)
7063                 return err;
7064
7065         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7066         if (err < 0)
7067                 return err;
7068
7069         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7070                 return -EINVAL;
7071
7072         if (!nft_setelem_valid_key_end(set, nla, flags))
7073                 return -EINVAL;
7074
7075         nft_set_ext_prepare(&tmpl);
7076
7077         if (flags != 0) {
7078                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7079                 if (err < 0)
7080                         return err;
7081         }
7082
7083         if (nla[NFTA_SET_ELEM_KEY]) {
7084                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7085                                             nla[NFTA_SET_ELEM_KEY]);
7086                 if (err < 0)
7087                         return err;
7088
7089                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7090                 if (err < 0)
7091                         goto fail_elem;
7092         }
7093
7094         if (nla[NFTA_SET_ELEM_KEY_END]) {
7095                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7096                                             nla[NFTA_SET_ELEM_KEY_END]);
7097                 if (err < 0)
7098                         goto fail_elem;
7099
7100                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7101                 if (err < 0)
7102                         goto fail_elem_key_end;
7103         }
7104
7105         err = -ENOMEM;
7106         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7107                                       elem.key_end.val.data, NULL, 0, 0,
7108                                       GFP_KERNEL_ACCOUNT);
7109         if (IS_ERR(elem.priv)) {
7110                 err = PTR_ERR(elem.priv);
7111                 goto fail_elem_key_end;
7112         }
7113
7114         ext = nft_set_elem_ext(set, elem.priv);
7115         if (flags)
7116                 *nft_set_ext_flags(ext) = flags;
7117
7118         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7119         if (trans == NULL)
7120                 goto fail_trans;
7121
7122         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7123         if (err < 0)
7124                 goto fail_ops;
7125
7126         nft_setelem_data_deactivate(ctx->net, set, &elem);
7127
7128         nft_trans_elem(trans) = elem;
7129         nft_trans_commit_list_add_tail(ctx->net, trans);
7130         return 0;
7131
7132 fail_ops:
7133         kfree(trans);
7134 fail_trans:
7135         kfree(elem.priv);
7136 fail_elem_key_end:
7137         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7138 fail_elem:
7139         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7140         return err;
7141 }
7142
7143 static int nft_setelem_flush(const struct nft_ctx *ctx,
7144                              struct nft_set *set,
7145                              const struct nft_set_iter *iter,
7146                              struct nft_set_elem *elem)
7147 {
7148         struct nft_trans *trans;
7149         int err;
7150
7151         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7152                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
7153         if (!trans)
7154                 return -ENOMEM;
7155
7156         if (!set->ops->flush(ctx->net, set, elem->priv)) {
7157                 err = -ENOENT;
7158                 goto err1;
7159         }
7160         set->ndeact++;
7161
7162         nft_setelem_data_deactivate(ctx->net, set, elem);
7163         nft_trans_elem_set(trans) = set;
7164         nft_trans_elem(trans) = *elem;
7165         nft_trans_commit_list_add_tail(ctx->net, trans);
7166
7167         return 0;
7168 err1:
7169         kfree(trans);
7170         return err;
7171 }
7172
7173 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7174                                     struct nft_set *set,
7175                                     struct nft_set_elem *elem)
7176 {
7177         struct nft_trans *trans;
7178
7179         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7180                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
7181         if (!trans)
7182                 return -ENOMEM;
7183
7184         nft_setelem_data_deactivate(ctx->net, set, elem);
7185         nft_trans_elem_set(trans) = set;
7186         nft_trans_elem(trans) = *elem;
7187         nft_trans_commit_list_add_tail(ctx->net, trans);
7188
7189         return 0;
7190 }
7191
7192 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7193                                   struct nft_set *set)
7194 {
7195         u8 genmask = nft_genmask_next(ctx->net);
7196         struct nft_set_elem_catchall *catchall;
7197         struct nft_set_elem elem;
7198         struct nft_set_ext *ext;
7199         int ret = 0;
7200
7201         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7202                 ext = nft_set_elem_ext(set, catchall->elem);
7203                 if (!nft_set_elem_active(ext, genmask))
7204                         continue;
7205
7206                 elem.priv = catchall->elem;
7207                 ret = __nft_set_catchall_flush(ctx, set, &elem);
7208                 if (ret < 0)
7209                         break;
7210                 nft_set_elem_change_active(ctx->net, set, ext);
7211         }
7212
7213         return ret;
7214 }
7215
7216 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7217 {
7218         struct nft_set_iter iter = {
7219                 .genmask        = genmask,
7220                 .fn             = nft_setelem_flush,
7221         };
7222
7223         set->ops->walk(ctx, set, &iter);
7224         if (!iter.err)
7225                 iter.err = nft_set_catchall_flush(ctx, set);
7226
7227         return iter.err;
7228 }
7229
7230 static int nf_tables_delsetelem(struct sk_buff *skb,
7231                                 const struct nfnl_info *info,
7232                                 const struct nlattr * const nla[])
7233 {
7234         struct netlink_ext_ack *extack = info->extack;
7235         u8 genmask = nft_genmask_next(info->net);
7236         u8 family = info->nfmsg->nfgen_family;
7237         struct net *net = info->net;
7238         const struct nlattr *attr;
7239         struct nft_table *table;
7240         struct nft_set *set;
7241         struct nft_ctx ctx;
7242         int rem, err = 0;
7243
7244         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7245                                  genmask, NETLINK_CB(skb).portid);
7246         if (IS_ERR(table)) {
7247                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7248                 return PTR_ERR(table);
7249         }
7250
7251         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7252         if (IS_ERR(set)) {
7253                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7254                 return PTR_ERR(set);
7255         }
7256
7257         if (nft_set_is_anonymous(set))
7258                 return -EOPNOTSUPP;
7259
7260         if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7261                 return -EBUSY;
7262
7263         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7264
7265         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7266                 return nft_set_flush(&ctx, set, genmask);
7267
7268         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7269                 err = nft_del_setelem(&ctx, set, attr);
7270                 if (err == -ENOENT &&
7271                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7272                         continue;
7273
7274                 if (err < 0) {
7275                         NL_SET_BAD_ATTR(extack, attr);
7276                         break;
7277                 }
7278         }
7279         return err;
7280 }
7281
7282 /*
7283  * Stateful objects
7284  */
7285
7286 /**
7287  *      nft_register_obj- register nf_tables stateful object type
7288  *      @obj_type: object type
7289  *
7290  *      Registers the object type for use with nf_tables. Returns zero on
7291  *      success or a negative errno code otherwise.
7292  */
7293 int nft_register_obj(struct nft_object_type *obj_type)
7294 {
7295         if (obj_type->type == NFT_OBJECT_UNSPEC)
7296                 return -EINVAL;
7297
7298         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7299         list_add_rcu(&obj_type->list, &nf_tables_objects);
7300         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7301         return 0;
7302 }
7303 EXPORT_SYMBOL_GPL(nft_register_obj);
7304
7305 /**
7306  *      nft_unregister_obj - unregister nf_tables object type
7307  *      @obj_type: object type
7308  *
7309  *      Unregisters the object type for use with nf_tables.
7310  */
7311 void nft_unregister_obj(struct nft_object_type *obj_type)
7312 {
7313         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7314         list_del_rcu(&obj_type->list);
7315         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7316 }
7317 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7318
7319 struct nft_object *nft_obj_lookup(const struct net *net,
7320                                   const struct nft_table *table,
7321                                   const struct nlattr *nla, u32 objtype,
7322                                   u8 genmask)
7323 {
7324         struct nft_object_hash_key k = { .table = table };
7325         char search[NFT_OBJ_MAXNAMELEN];
7326         struct rhlist_head *tmp, *list;
7327         struct nft_object *obj;
7328
7329         nla_strscpy(search, nla, sizeof(search));
7330         k.name = search;
7331
7332         WARN_ON_ONCE(!rcu_read_lock_held() &&
7333                      !lockdep_commit_lock_is_held(net));
7334
7335         rcu_read_lock();
7336         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7337         if (!list)
7338                 goto out;
7339
7340         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7341                 if (objtype == obj->ops->type->type &&
7342                     nft_active_genmask(obj, genmask)) {
7343                         rcu_read_unlock();
7344                         return obj;
7345                 }
7346         }
7347 out:
7348         rcu_read_unlock();
7349         return ERR_PTR(-ENOENT);
7350 }
7351 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7352
7353 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7354                                                   const struct nlattr *nla,
7355                                                   u32 objtype, u8 genmask)
7356 {
7357         struct nft_object *obj;
7358
7359         list_for_each_entry(obj, &table->objects, list) {
7360                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7361                     objtype == obj->ops->type->type &&
7362                     nft_active_genmask(obj, genmask))
7363                         return obj;
7364         }
7365         return ERR_PTR(-ENOENT);
7366 }
7367
7368 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7369         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7370                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7371         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7372                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7373         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7374         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7375         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7376         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7377                                     .len = NFT_USERDATA_MAXLEN },
7378 };
7379
7380 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7381                                        const struct nft_object_type *type,
7382                                        const struct nlattr *attr)
7383 {
7384         struct nlattr **tb;
7385         const struct nft_object_ops *ops;
7386         struct nft_object *obj;
7387         int err = -ENOMEM;
7388
7389         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7390         if (!tb)
7391                 goto err1;
7392
7393         if (attr) {
7394                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7395                                                   type->policy, NULL);
7396                 if (err < 0)
7397                         goto err2;
7398         } else {
7399                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7400         }
7401
7402         if (type->select_ops) {
7403                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7404                 if (IS_ERR(ops)) {
7405                         err = PTR_ERR(ops);
7406                         goto err2;
7407                 }
7408         } else {
7409                 ops = type->ops;
7410         }
7411
7412         err = -ENOMEM;
7413         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7414         if (!obj)
7415                 goto err2;
7416
7417         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7418         if (err < 0)
7419                 goto err3;
7420
7421         obj->ops = ops;
7422
7423         kfree(tb);
7424         return obj;
7425 err3:
7426         kfree(obj);
7427 err2:
7428         kfree(tb);
7429 err1:
7430         return ERR_PTR(err);
7431 }
7432
7433 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7434                            struct nft_object *obj, bool reset)
7435 {
7436         struct nlattr *nest;
7437
7438         nest = nla_nest_start_noflag(skb, attr);
7439         if (!nest)
7440                 goto nla_put_failure;
7441         if (obj->ops->dump(skb, obj, reset) < 0)
7442                 goto nla_put_failure;
7443         nla_nest_end(skb, nest);
7444         return 0;
7445
7446 nla_put_failure:
7447         return -1;
7448 }
7449
7450 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7451 {
7452         const struct nft_object_type *type;
7453
7454         list_for_each_entry(type, &nf_tables_objects, list) {
7455                 if (objtype == type->type)
7456                         return type;
7457         }
7458         return NULL;
7459 }
7460
7461 static const struct nft_object_type *
7462 nft_obj_type_get(struct net *net, u32 objtype)
7463 {
7464         const struct nft_object_type *type;
7465
7466         type = __nft_obj_type_get(objtype);
7467         if (type != NULL && try_module_get(type->owner))
7468                 return type;
7469
7470         lockdep_nfnl_nft_mutex_not_held();
7471 #ifdef CONFIG_MODULES
7472         if (type == NULL) {
7473                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7474                         return ERR_PTR(-EAGAIN);
7475         }
7476 #endif
7477         return ERR_PTR(-ENOENT);
7478 }
7479
7480 static int nf_tables_updobj(const struct nft_ctx *ctx,
7481                             const struct nft_object_type *type,
7482                             const struct nlattr *attr,
7483                             struct nft_object *obj)
7484 {
7485         struct nft_object *newobj;
7486         struct nft_trans *trans;
7487         int err = -ENOMEM;
7488
7489         if (!try_module_get(type->owner))
7490                 return -ENOENT;
7491
7492         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7493                                 sizeof(struct nft_trans_obj));
7494         if (!trans)
7495                 goto err_trans;
7496
7497         newobj = nft_obj_init(ctx, type, attr);
7498         if (IS_ERR(newobj)) {
7499                 err = PTR_ERR(newobj);
7500                 goto err_free_trans;
7501         }
7502
7503         nft_trans_obj(trans) = obj;
7504         nft_trans_obj_update(trans) = true;
7505         nft_trans_obj_newobj(trans) = newobj;
7506         nft_trans_commit_list_add_tail(ctx->net, trans);
7507
7508         return 0;
7509
7510 err_free_trans:
7511         kfree(trans);
7512 err_trans:
7513         module_put(type->owner);
7514         return err;
7515 }
7516
7517 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7518                             const struct nlattr * const nla[])
7519 {
7520         struct netlink_ext_ack *extack = info->extack;
7521         u8 genmask = nft_genmask_next(info->net);
7522         u8 family = info->nfmsg->nfgen_family;
7523         const struct nft_object_type *type;
7524         struct net *net = info->net;
7525         struct nft_table *table;
7526         struct nft_object *obj;
7527         struct nft_ctx ctx;
7528         u32 objtype;
7529         int err;
7530
7531         if (!nla[NFTA_OBJ_TYPE] ||
7532             !nla[NFTA_OBJ_NAME] ||
7533             !nla[NFTA_OBJ_DATA])
7534                 return -EINVAL;
7535
7536         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7537                                  NETLINK_CB(skb).portid);
7538         if (IS_ERR(table)) {
7539                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7540                 return PTR_ERR(table);
7541         }
7542
7543         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7544         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7545         if (IS_ERR(obj)) {
7546                 err = PTR_ERR(obj);
7547                 if (err != -ENOENT) {
7548                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7549                         return err;
7550                 }
7551         } else {
7552                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7553                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7554                         return -EEXIST;
7555                 }
7556                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7557                         return -EOPNOTSUPP;
7558
7559                 type = __nft_obj_type_get(objtype);
7560                 if (WARN_ON_ONCE(!type))
7561                         return -ENOENT;
7562
7563                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7564
7565                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7566         }
7567
7568         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7569
7570         if (!nft_use_inc(&table->use))
7571                 return -EMFILE;
7572
7573         type = nft_obj_type_get(net, objtype);
7574         if (IS_ERR(type)) {
7575                 err = PTR_ERR(type);
7576                 goto err_type;
7577         }
7578
7579         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7580         if (IS_ERR(obj)) {
7581                 err = PTR_ERR(obj);
7582                 goto err_init;
7583         }
7584         obj->key.table = table;
7585         obj->handle = nf_tables_alloc_handle(table);
7586
7587         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7588         if (!obj->key.name) {
7589                 err = -ENOMEM;
7590                 goto err_strdup;
7591         }
7592
7593         if (nla[NFTA_OBJ_USERDATA]) {
7594                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7595                 if (obj->udata == NULL)
7596                         goto err_userdata;
7597
7598                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7599         }
7600
7601         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7602         if (err < 0)
7603                 goto err_trans;
7604
7605         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7606                               nft_objname_ht_params);
7607         if (err < 0)
7608                 goto err_obj_ht;
7609
7610         list_add_tail_rcu(&obj->list, &table->objects);
7611
7612         return 0;
7613 err_obj_ht:
7614         /* queued in transaction log */
7615         INIT_LIST_HEAD(&obj->list);
7616         return err;
7617 err_trans:
7618         kfree(obj->udata);
7619 err_userdata:
7620         kfree(obj->key.name);
7621 err_strdup:
7622         if (obj->ops->destroy)
7623                 obj->ops->destroy(&ctx, obj);
7624         kfree(obj);
7625 err_init:
7626         module_put(type->owner);
7627 err_type:
7628         nft_use_dec_restore(&table->use);
7629
7630         return err;
7631 }
7632
7633 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7634                                    u32 portid, u32 seq, int event, u32 flags,
7635                                    int family, const struct nft_table *table,
7636                                    struct nft_object *obj, bool reset)
7637 {
7638         struct nlmsghdr *nlh;
7639
7640         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7641         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7642                            NFNETLINK_V0, nft_base_seq(net));
7643         if (!nlh)
7644                 goto nla_put_failure;
7645
7646         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7647             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7648             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7649                          NFTA_OBJ_PAD))
7650                 goto nla_put_failure;
7651
7652         if (event == NFT_MSG_DELOBJ) {
7653                 nlmsg_end(skb, nlh);
7654                 return 0;
7655         }
7656
7657         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7658             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7659             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7660                 goto nla_put_failure;
7661
7662         if (obj->udata &&
7663             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7664                 goto nla_put_failure;
7665
7666         nlmsg_end(skb, nlh);
7667         return 0;
7668
7669 nla_put_failure:
7670         nlmsg_trim(skb, nlh);
7671         return -1;
7672 }
7673
7674 static void audit_log_obj_reset(const struct nft_table *table,
7675                                 unsigned int base_seq, unsigned int nentries)
7676 {
7677         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7678
7679         audit_log_nfcfg(buf, table->family, nentries,
7680                         AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7681         kfree(buf);
7682 }
7683
7684 struct nft_obj_filter {
7685         char            *table;
7686         u32             type;
7687 };
7688
7689 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7690 {
7691         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7692         const struct nft_table *table;
7693         unsigned int idx = 0, s_idx = cb->args[0];
7694         struct nft_obj_filter *filter = cb->data;
7695         struct net *net = sock_net(skb->sk);
7696         int family = nfmsg->nfgen_family;
7697         struct nftables_pernet *nft_net;
7698         unsigned int entries = 0;
7699         struct nft_object *obj;
7700         bool reset = false;
7701         int rc = 0;
7702
7703         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7704                 reset = true;
7705
7706         rcu_read_lock();
7707         nft_net = nft_pernet(net);
7708         cb->seq = READ_ONCE(nft_net->base_seq);
7709
7710         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7711                 if (family != NFPROTO_UNSPEC && family != table->family)
7712                         continue;
7713
7714                 entries = 0;
7715                 list_for_each_entry_rcu(obj, &table->objects, list) {
7716                         if (!nft_is_active(net, obj))
7717                                 goto cont;
7718                         if (idx < s_idx)
7719                                 goto cont;
7720                         if (filter->table && strcmp(filter->table, table->name))
7721                                 goto cont;
7722                         if (filter->type != NFT_OBJECT_UNSPEC &&
7723                             obj->ops->type->type != filter->type)
7724                                 goto cont;
7725
7726                         rc = nf_tables_fill_obj_info(skb, net,
7727                                                      NETLINK_CB(cb->skb).portid,
7728                                                      cb->nlh->nlmsg_seq,
7729                                                      NFT_MSG_NEWOBJ,
7730                                                      NLM_F_MULTI | NLM_F_APPEND,
7731                                                      table->family, table,
7732                                                      obj, reset);
7733                         if (rc < 0)
7734                                 break;
7735
7736                         entries++;
7737                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7738 cont:
7739                         idx++;
7740                 }
7741                 if (reset && entries)
7742                         audit_log_obj_reset(table, nft_net->base_seq, entries);
7743                 if (rc < 0)
7744                         break;
7745         }
7746         rcu_read_unlock();
7747
7748         cb->args[0] = idx;
7749         return skb->len;
7750 }
7751
7752 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7753 {
7754         const struct nlattr * const *nla = cb->data;
7755         struct nft_obj_filter *filter = NULL;
7756
7757         filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7758         if (!filter)
7759                 return -ENOMEM;
7760
7761         if (nla[NFTA_OBJ_TABLE]) {
7762                 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7763                 if (!filter->table) {
7764                         kfree(filter);
7765                         return -ENOMEM;
7766                 }
7767         }
7768
7769         if (nla[NFTA_OBJ_TYPE])
7770                 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7771
7772         cb->data = filter;
7773         return 0;
7774 }
7775
7776 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7777 {
7778         struct nft_obj_filter *filter = cb->data;
7779
7780         kfree(filter->table);
7781         kfree(filter);
7782
7783         return 0;
7784 }
7785
7786 /* called with rcu_read_lock held */
7787 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7788                             const struct nlattr * const nla[])
7789 {
7790         struct netlink_ext_ack *extack = info->extack;
7791         u8 genmask = nft_genmask_cur(info->net);
7792         u8 family = info->nfmsg->nfgen_family;
7793         const struct nft_table *table;
7794         struct net *net = info->net;
7795         struct nft_object *obj;
7796         struct sk_buff *skb2;
7797         bool reset = false;
7798         u32 objtype;
7799         int err;
7800
7801         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7802                 struct netlink_dump_control c = {
7803                         .start = nf_tables_dump_obj_start,
7804                         .dump = nf_tables_dump_obj,
7805                         .done = nf_tables_dump_obj_done,
7806                         .module = THIS_MODULE,
7807                         .data = (void *)nla,
7808                 };
7809
7810                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7811         }
7812
7813         if (!nla[NFTA_OBJ_NAME] ||
7814             !nla[NFTA_OBJ_TYPE])
7815                 return -EINVAL;
7816
7817         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7818         if (IS_ERR(table)) {
7819                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7820                 return PTR_ERR(table);
7821         }
7822
7823         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7824         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7825         if (IS_ERR(obj)) {
7826                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7827                 return PTR_ERR(obj);
7828         }
7829
7830         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7831         if (!skb2)
7832                 return -ENOMEM;
7833
7834         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7835                 reset = true;
7836
7837         if (reset) {
7838                 const struct nftables_pernet *nft_net;
7839                 char *buf;
7840
7841                 nft_net = nft_pernet(net);
7842                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7843
7844                 audit_log_nfcfg(buf,
7845                                 family,
7846                                 1,
7847                                 AUDIT_NFT_OP_OBJ_RESET,
7848                                 GFP_ATOMIC);
7849                 kfree(buf);
7850         }
7851
7852         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7853                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7854                                       family, table, obj, reset);
7855         if (err < 0)
7856                 goto err_fill_obj_info;
7857
7858         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7859
7860 err_fill_obj_info:
7861         kfree_skb(skb2);
7862         return err;
7863 }
7864
7865 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7866 {
7867         if (obj->ops->destroy)
7868                 obj->ops->destroy(ctx, obj);
7869
7870         module_put(obj->ops->type->owner);
7871         kfree(obj->key.name);
7872         kfree(obj->udata);
7873         kfree(obj);
7874 }
7875
7876 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7877                             const struct nlattr * const nla[])
7878 {
7879         struct netlink_ext_ack *extack = info->extack;
7880         u8 genmask = nft_genmask_next(info->net);
7881         u8 family = info->nfmsg->nfgen_family;
7882         struct net *net = info->net;
7883         const struct nlattr *attr;
7884         struct nft_table *table;
7885         struct nft_object *obj;
7886         struct nft_ctx ctx;
7887         u32 objtype;
7888
7889         if (!nla[NFTA_OBJ_TYPE] ||
7890             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7891                 return -EINVAL;
7892
7893         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7894                                  NETLINK_CB(skb).portid);
7895         if (IS_ERR(table)) {
7896                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7897                 return PTR_ERR(table);
7898         }
7899
7900         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7901         if (nla[NFTA_OBJ_HANDLE]) {
7902                 attr = nla[NFTA_OBJ_HANDLE];
7903                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7904         } else {
7905                 attr = nla[NFTA_OBJ_NAME];
7906                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7907         }
7908
7909         if (IS_ERR(obj)) {
7910                 if (PTR_ERR(obj) == -ENOENT &&
7911                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7912                         return 0;
7913
7914                 NL_SET_BAD_ATTR(extack, attr);
7915                 return PTR_ERR(obj);
7916         }
7917         if (obj->use > 0) {
7918                 NL_SET_BAD_ATTR(extack, attr);
7919                 return -EBUSY;
7920         }
7921
7922         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7923
7924         return nft_delobj(&ctx, obj);
7925 }
7926
7927 static void
7928 __nft_obj_notify(struct net *net, const struct nft_table *table,
7929                  struct nft_object *obj, u32 portid, u32 seq, int event,
7930                  u16 flags, int family, int report, gfp_t gfp)
7931 {
7932         struct nftables_pernet *nft_net = nft_pernet(net);
7933         struct sk_buff *skb;
7934         int err;
7935
7936         if (!report &&
7937             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7938                 return;
7939
7940         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7941         if (skb == NULL)
7942                 goto err;
7943
7944         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7945                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7946                                       family, table, obj, false);
7947         if (err < 0) {
7948                 kfree_skb(skb);
7949                 goto err;
7950         }
7951
7952         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7953         return;
7954 err:
7955         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7956 }
7957
7958 void nft_obj_notify(struct net *net, const struct nft_table *table,
7959                     struct nft_object *obj, u32 portid, u32 seq, int event,
7960                     u16 flags, int family, int report, gfp_t gfp)
7961 {
7962         struct nftables_pernet *nft_net = nft_pernet(net);
7963         char *buf = kasprintf(gfp, "%s:%u",
7964                               table->name, nft_net->base_seq);
7965
7966         audit_log_nfcfg(buf,
7967                         family,
7968                         obj->handle,
7969                         event == NFT_MSG_NEWOBJ ?
7970                                  AUDIT_NFT_OP_OBJ_REGISTER :
7971                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7972                         gfp);
7973         kfree(buf);
7974
7975         __nft_obj_notify(net, table, obj, portid, seq, event,
7976                          flags, family, report, gfp);
7977 }
7978 EXPORT_SYMBOL_GPL(nft_obj_notify);
7979
7980 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7981                                  struct nft_object *obj, int event)
7982 {
7983         __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
7984                          ctx->seq, event, ctx->flags, ctx->family,
7985                          ctx->report, GFP_KERNEL);
7986 }
7987
7988 /*
7989  * Flow tables
7990  */
7991 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7992 {
7993         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7994         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7995         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7996 }
7997 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7998
7999 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
8000 {
8001         nfnl_lock(NFNL_SUBSYS_NFTABLES);
8002         list_del_rcu(&type->list);
8003         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8004 }
8005 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
8006
8007 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
8008         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
8009                                             .len = NFT_NAME_MAXLEN - 1 },
8010         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
8011                                             .len = NFT_NAME_MAXLEN - 1 },
8012         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
8013         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
8014         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
8015 };
8016
8017 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
8018                                            const struct nlattr *nla, u8 genmask)
8019 {
8020         struct nft_flowtable *flowtable;
8021
8022         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8023                 if (!nla_strcmp(nla, flowtable->name) &&
8024                     nft_active_genmask(flowtable, genmask))
8025                         return flowtable;
8026         }
8027         return ERR_PTR(-ENOENT);
8028 }
8029 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8030
8031 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8032                                     struct nft_flowtable *flowtable,
8033                                     enum nft_trans_phase phase)
8034 {
8035         switch (phase) {
8036         case NFT_TRANS_PREPARE_ERROR:
8037         case NFT_TRANS_PREPARE:
8038         case NFT_TRANS_ABORT:
8039         case NFT_TRANS_RELEASE:
8040                 nft_use_dec(&flowtable->use);
8041                 fallthrough;
8042         default:
8043                 return;
8044         }
8045 }
8046 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8047
8048 static struct nft_flowtable *
8049 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8050                               const struct nlattr *nla, u8 genmask)
8051 {
8052        struct nft_flowtable *flowtable;
8053
8054        list_for_each_entry(flowtable, &table->flowtables, list) {
8055                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8056                    nft_active_genmask(flowtable, genmask))
8057                        return flowtable;
8058        }
8059        return ERR_PTR(-ENOENT);
8060 }
8061
8062 struct nft_flowtable_hook {
8063         u32                     num;
8064         int                     priority;
8065         struct list_head        list;
8066 };
8067
8068 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8069         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
8070         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
8071         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
8072 };
8073
8074 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8075                                     const struct nlattr * const nla[],
8076                                     struct nft_flowtable_hook *flowtable_hook,
8077                                     struct nft_flowtable *flowtable,
8078                                     struct netlink_ext_ack *extack, bool add)
8079 {
8080         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8081         struct nft_hook *hook;
8082         int hooknum, priority;
8083         int err;
8084
8085         INIT_LIST_HEAD(&flowtable_hook->list);
8086
8087         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8088                                           nla[NFTA_FLOWTABLE_HOOK],
8089                                           nft_flowtable_hook_policy, NULL);
8090         if (err < 0)
8091                 return err;
8092
8093         if (add) {
8094                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8095                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8096                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8097                         return -ENOENT;
8098                 }
8099
8100                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8101                 if (hooknum != NF_NETDEV_INGRESS)
8102                         return -EOPNOTSUPP;
8103
8104                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8105
8106                 flowtable_hook->priority        = priority;
8107                 flowtable_hook->num             = hooknum;
8108         } else {
8109                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8110                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8111                         if (hooknum != flowtable->hooknum)
8112                                 return -EOPNOTSUPP;
8113                 }
8114
8115                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8116                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8117                         if (priority != flowtable->data.priority)
8118                                 return -EOPNOTSUPP;
8119                 }
8120
8121                 flowtable_hook->priority        = flowtable->data.priority;
8122                 flowtable_hook->num             = flowtable->hooknum;
8123         }
8124
8125         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8126                 err = nf_tables_parse_netdev_hooks(ctx->net,
8127                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
8128                                                    &flowtable_hook->list,
8129                                                    extack);
8130                 if (err < 0)
8131                         return err;
8132         }
8133
8134         list_for_each_entry(hook, &flowtable_hook->list, list) {
8135                 hook->ops.pf            = NFPROTO_NETDEV;
8136                 hook->ops.hooknum       = flowtable_hook->num;
8137                 hook->ops.priority      = flowtable_hook->priority;
8138                 hook->ops.priv          = &flowtable->data;
8139                 hook->ops.hook          = flowtable->data.type->hook;
8140         }
8141
8142         return err;
8143 }
8144
8145 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8146 {
8147         const struct nf_flowtable_type *type;
8148
8149         list_for_each_entry(type, &nf_tables_flowtables, list) {
8150                 if (family == type->family)
8151                         return type;
8152         }
8153         return NULL;
8154 }
8155
8156 static const struct nf_flowtable_type *
8157 nft_flowtable_type_get(struct net *net, u8 family)
8158 {
8159         const struct nf_flowtable_type *type;
8160
8161         type = __nft_flowtable_type_get(family);
8162         if (type != NULL && try_module_get(type->owner))
8163                 return type;
8164
8165         lockdep_nfnl_nft_mutex_not_held();
8166 #ifdef CONFIG_MODULES
8167         if (type == NULL) {
8168                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8169                         return ERR_PTR(-EAGAIN);
8170         }
8171 #endif
8172         return ERR_PTR(-ENOENT);
8173 }
8174
8175 /* Only called from error and netdev event paths. */
8176 static void nft_unregister_flowtable_hook(struct net *net,
8177                                           struct nft_flowtable *flowtable,
8178                                           struct nft_hook *hook)
8179 {
8180         nf_unregister_net_hook(net, &hook->ops);
8181         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8182                                     FLOW_BLOCK_UNBIND);
8183 }
8184
8185 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8186                                                  struct list_head *hook_list,
8187                                                  bool release_netdev)
8188 {
8189         struct nft_hook *hook, *next;
8190
8191         list_for_each_entry_safe(hook, next, hook_list, list) {
8192                 nf_unregister_net_hook(net, &hook->ops);
8193                 if (release_netdev) {
8194                         list_del(&hook->list);
8195                         kfree_rcu(hook, rcu);
8196                 }
8197         }
8198 }
8199
8200 static void nft_unregister_flowtable_net_hooks(struct net *net,
8201                                                struct list_head *hook_list)
8202 {
8203         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8204 }
8205
8206 static int nft_register_flowtable_net_hooks(struct net *net,
8207                                             struct nft_table *table,
8208                                             struct list_head *hook_list,
8209                                             struct nft_flowtable *flowtable)
8210 {
8211         struct nft_hook *hook, *hook2, *next;
8212         struct nft_flowtable *ft;
8213         int err, i = 0;
8214
8215         list_for_each_entry(hook, hook_list, list) {
8216                 list_for_each_entry(ft, &table->flowtables, list) {
8217                         if (!nft_is_active_next(net, ft))
8218                                 continue;
8219
8220                         list_for_each_entry(hook2, &ft->hook_list, list) {
8221                                 if (hook->ops.dev == hook2->ops.dev &&
8222                                     hook->ops.pf == hook2->ops.pf) {
8223                                         err = -EEXIST;
8224                                         goto err_unregister_net_hooks;
8225                                 }
8226                         }
8227                 }
8228
8229                 err = flowtable->data.type->setup(&flowtable->data,
8230                                                   hook->ops.dev,
8231                                                   FLOW_BLOCK_BIND);
8232                 if (err < 0)
8233                         goto err_unregister_net_hooks;
8234
8235                 err = nf_register_net_hook(net, &hook->ops);
8236                 if (err < 0) {
8237                         flowtable->data.type->setup(&flowtable->data,
8238                                                     hook->ops.dev,
8239                                                     FLOW_BLOCK_UNBIND);
8240                         goto err_unregister_net_hooks;
8241                 }
8242
8243                 i++;
8244         }
8245
8246         return 0;
8247
8248 err_unregister_net_hooks:
8249         list_for_each_entry_safe(hook, next, hook_list, list) {
8250                 if (i-- <= 0)
8251                         break;
8252
8253                 nft_unregister_flowtable_hook(net, flowtable, hook);
8254                 list_del_rcu(&hook->list);
8255                 kfree_rcu(hook, rcu);
8256         }
8257
8258         return err;
8259 }
8260
8261 static void nft_hooks_destroy(struct list_head *hook_list)
8262 {
8263         struct nft_hook *hook, *next;
8264
8265         list_for_each_entry_safe(hook, next, hook_list, list) {
8266                 list_del_rcu(&hook->list);
8267                 kfree_rcu(hook, rcu);
8268         }
8269 }
8270
8271 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8272                                 struct nft_flowtable *flowtable,
8273                                 struct netlink_ext_ack *extack)
8274 {
8275         const struct nlattr * const *nla = ctx->nla;
8276         struct nft_flowtable_hook flowtable_hook;
8277         struct nft_hook *hook, *next;
8278         struct nft_trans *trans;
8279         bool unregister = false;
8280         u32 flags;
8281         int err;
8282
8283         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8284                                        extack, false);
8285         if (err < 0)
8286                 return err;
8287
8288         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8289                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8290                         list_del(&hook->list);
8291                         kfree(hook);
8292                 }
8293         }
8294
8295         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8296                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8297                 if (flags & ~NFT_FLOWTABLE_MASK) {
8298                         err = -EOPNOTSUPP;
8299                         goto err_flowtable_update_hook;
8300                 }
8301                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8302                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8303                         err = -EOPNOTSUPP;
8304                         goto err_flowtable_update_hook;
8305                 }
8306         } else {
8307                 flags = flowtable->data.flags;
8308         }
8309
8310         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8311                                                &flowtable_hook.list, flowtable);
8312         if (err < 0)
8313                 goto err_flowtable_update_hook;
8314
8315         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8316                                 sizeof(struct nft_trans_flowtable));
8317         if (!trans) {
8318                 unregister = true;
8319                 err = -ENOMEM;
8320                 goto err_flowtable_update_hook;
8321         }
8322
8323         nft_trans_flowtable_flags(trans) = flags;
8324         nft_trans_flowtable(trans) = flowtable;
8325         nft_trans_flowtable_update(trans) = true;
8326         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8327         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8328
8329         nft_trans_commit_list_add_tail(ctx->net, trans);
8330
8331         return 0;
8332
8333 err_flowtable_update_hook:
8334         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8335                 if (unregister)
8336                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8337                 list_del_rcu(&hook->list);
8338                 kfree_rcu(hook, rcu);
8339         }
8340
8341         return err;
8342
8343 }
8344
8345 static int nf_tables_newflowtable(struct sk_buff *skb,
8346                                   const struct nfnl_info *info,
8347                                   const struct nlattr * const nla[])
8348 {
8349         struct netlink_ext_ack *extack = info->extack;
8350         struct nft_flowtable_hook flowtable_hook;
8351         u8 genmask = nft_genmask_next(info->net);
8352         u8 family = info->nfmsg->nfgen_family;
8353         const struct nf_flowtable_type *type;
8354         struct nft_flowtable *flowtable;
8355         struct nft_hook *hook, *next;
8356         struct net *net = info->net;
8357         struct nft_table *table;
8358         struct nft_ctx ctx;
8359         int err;
8360
8361         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8362             !nla[NFTA_FLOWTABLE_NAME] ||
8363             !nla[NFTA_FLOWTABLE_HOOK])
8364                 return -EINVAL;
8365
8366         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8367                                  genmask, NETLINK_CB(skb).portid);
8368         if (IS_ERR(table)) {
8369                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8370                 return PTR_ERR(table);
8371         }
8372
8373         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8374                                          genmask);
8375         if (IS_ERR(flowtable)) {
8376                 err = PTR_ERR(flowtable);
8377                 if (err != -ENOENT) {
8378                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8379                         return err;
8380                 }
8381         } else {
8382                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8383                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8384                         return -EEXIST;
8385                 }
8386
8387                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8388
8389                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8390         }
8391
8392         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8393
8394         if (!nft_use_inc(&table->use))
8395                 return -EMFILE;
8396
8397         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8398         if (!flowtable) {
8399                 err = -ENOMEM;
8400                 goto flowtable_alloc;
8401         }
8402
8403         flowtable->table = table;
8404         flowtable->handle = nf_tables_alloc_handle(table);
8405         INIT_LIST_HEAD(&flowtable->hook_list);
8406
8407         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8408         if (!flowtable->name) {
8409                 err = -ENOMEM;
8410                 goto err1;
8411         }
8412
8413         type = nft_flowtable_type_get(net, family);
8414         if (IS_ERR(type)) {
8415                 err = PTR_ERR(type);
8416                 goto err2;
8417         }
8418
8419         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8420                 flowtable->data.flags =
8421                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8422                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8423                         err = -EOPNOTSUPP;
8424                         goto err3;
8425                 }
8426         }
8427
8428         write_pnet(&flowtable->data.net, net);
8429         flowtable->data.type = type;
8430         err = type->init(&flowtable->data);
8431         if (err < 0)
8432                 goto err3;
8433
8434         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8435                                        extack, true);
8436         if (err < 0)
8437                 goto err4;
8438
8439         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8440         flowtable->data.priority = flowtable_hook.priority;
8441         flowtable->hooknum = flowtable_hook.num;
8442
8443         err = nft_register_flowtable_net_hooks(ctx.net, table,
8444                                                &flowtable->hook_list,
8445                                                flowtable);
8446         if (err < 0) {
8447                 nft_hooks_destroy(&flowtable->hook_list);
8448                 goto err4;
8449         }
8450
8451         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8452         if (err < 0)
8453                 goto err5;
8454
8455         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8456
8457         return 0;
8458 err5:
8459         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8460                 nft_unregister_flowtable_hook(net, flowtable, hook);
8461                 list_del_rcu(&hook->list);
8462                 kfree_rcu(hook, rcu);
8463         }
8464 err4:
8465         flowtable->data.type->free(&flowtable->data);
8466 err3:
8467         module_put(type->owner);
8468 err2:
8469         kfree(flowtable->name);
8470 err1:
8471         kfree(flowtable);
8472 flowtable_alloc:
8473         nft_use_dec_restore(&table->use);
8474
8475         return err;
8476 }
8477
8478 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8479 {
8480         struct nft_hook *this, *next;
8481
8482         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8483                 list_del(&this->list);
8484                 kfree(this);
8485         }
8486 }
8487
8488 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8489                                  struct nft_flowtable *flowtable,
8490                                  struct netlink_ext_ack *extack)
8491 {
8492         const struct nlattr * const *nla = ctx->nla;
8493         struct nft_flowtable_hook flowtable_hook;
8494         LIST_HEAD(flowtable_del_list);
8495         struct nft_hook *this, *hook;
8496         struct nft_trans *trans;
8497         int err;
8498
8499         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8500                                        extack, false);
8501         if (err < 0)
8502                 return err;
8503
8504         list_for_each_entry(this, &flowtable_hook.list, list) {
8505                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8506                 if (!hook) {
8507                         err = -ENOENT;
8508                         goto err_flowtable_del_hook;
8509                 }
8510                 list_move(&hook->list, &flowtable_del_list);
8511         }
8512
8513         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8514                                 sizeof(struct nft_trans_flowtable));
8515         if (!trans) {
8516                 err = -ENOMEM;
8517                 goto err_flowtable_del_hook;
8518         }
8519
8520         nft_trans_flowtable(trans) = flowtable;
8521         nft_trans_flowtable_update(trans) = true;
8522         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8523         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8524         nft_flowtable_hook_release(&flowtable_hook);
8525
8526         nft_trans_commit_list_add_tail(ctx->net, trans);
8527
8528         return 0;
8529
8530 err_flowtable_del_hook:
8531         list_splice(&flowtable_del_list, &flowtable->hook_list);
8532         nft_flowtable_hook_release(&flowtable_hook);
8533
8534         return err;
8535 }
8536
8537 static int nf_tables_delflowtable(struct sk_buff *skb,
8538                                   const struct nfnl_info *info,
8539                                   const struct nlattr * const nla[])
8540 {
8541         struct netlink_ext_ack *extack = info->extack;
8542         u8 genmask = nft_genmask_next(info->net);
8543         u8 family = info->nfmsg->nfgen_family;
8544         struct nft_flowtable *flowtable;
8545         struct net *net = info->net;
8546         const struct nlattr *attr;
8547         struct nft_table *table;
8548         struct nft_ctx ctx;
8549
8550         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8551             (!nla[NFTA_FLOWTABLE_NAME] &&
8552              !nla[NFTA_FLOWTABLE_HANDLE]))
8553                 return -EINVAL;
8554
8555         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8556                                  genmask, NETLINK_CB(skb).portid);
8557         if (IS_ERR(table)) {
8558                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8559                 return PTR_ERR(table);
8560         }
8561
8562         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8563                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8564                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8565         } else {
8566                 attr = nla[NFTA_FLOWTABLE_NAME];
8567                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8568         }
8569
8570         if (IS_ERR(flowtable)) {
8571                 if (PTR_ERR(flowtable) == -ENOENT &&
8572                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8573                         return 0;
8574
8575                 NL_SET_BAD_ATTR(extack, attr);
8576                 return PTR_ERR(flowtable);
8577         }
8578
8579         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8580
8581         if (nla[NFTA_FLOWTABLE_HOOK])
8582                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8583
8584         if (flowtable->use > 0) {
8585                 NL_SET_BAD_ATTR(extack, attr);
8586                 return -EBUSY;
8587         }
8588
8589         return nft_delflowtable(&ctx, flowtable);
8590 }
8591
8592 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8593                                          u32 portid, u32 seq, int event,
8594                                          u32 flags, int family,
8595                                          struct nft_flowtable *flowtable,
8596                                          struct list_head *hook_list)
8597 {
8598         struct nlattr *nest, *nest_devs;
8599         struct nft_hook *hook;
8600         struct nlmsghdr *nlh;
8601
8602         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8603         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8604                            NFNETLINK_V0, nft_base_seq(net));
8605         if (!nlh)
8606                 goto nla_put_failure;
8607
8608         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8609             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8610             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8611                          NFTA_FLOWTABLE_PAD))
8612                 goto nla_put_failure;
8613
8614         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8615                 nlmsg_end(skb, nlh);
8616                 return 0;
8617         }
8618
8619         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8620             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8621                 goto nla_put_failure;
8622
8623         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8624         if (!nest)
8625                 goto nla_put_failure;
8626         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8627             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8628                 goto nla_put_failure;
8629
8630         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8631         if (!nest_devs)
8632                 goto nla_put_failure;
8633
8634         if (!hook_list)
8635                 hook_list = &flowtable->hook_list;
8636
8637         list_for_each_entry_rcu(hook, hook_list, list) {
8638                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8639                         goto nla_put_failure;
8640         }
8641         nla_nest_end(skb, nest_devs);
8642         nla_nest_end(skb, nest);
8643
8644         nlmsg_end(skb, nlh);
8645         return 0;
8646
8647 nla_put_failure:
8648         nlmsg_trim(skb, nlh);
8649         return -1;
8650 }
8651
8652 struct nft_flowtable_filter {
8653         char            *table;
8654 };
8655
8656 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8657                                     struct netlink_callback *cb)
8658 {
8659         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8660         struct nft_flowtable_filter *filter = cb->data;
8661         unsigned int idx = 0, s_idx = cb->args[0];
8662         struct net *net = sock_net(skb->sk);
8663         int family = nfmsg->nfgen_family;
8664         struct nft_flowtable *flowtable;
8665         struct nftables_pernet *nft_net;
8666         const struct nft_table *table;
8667
8668         rcu_read_lock();
8669         nft_net = nft_pernet(net);
8670         cb->seq = READ_ONCE(nft_net->base_seq);
8671
8672         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8673                 if (family != NFPROTO_UNSPEC && family != table->family)
8674                         continue;
8675
8676                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8677                         if (!nft_is_active(net, flowtable))
8678                                 goto cont;
8679                         if (idx < s_idx)
8680                                 goto cont;
8681                         if (idx > s_idx)
8682                                 memset(&cb->args[1], 0,
8683                                        sizeof(cb->args) - sizeof(cb->args[0]));
8684                         if (filter && filter->table &&
8685                             strcmp(filter->table, table->name))
8686                                 goto cont;
8687
8688                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8689                                                           cb->nlh->nlmsg_seq,
8690                                                           NFT_MSG_NEWFLOWTABLE,
8691                                                           NLM_F_MULTI | NLM_F_APPEND,
8692                                                           table->family,
8693                                                           flowtable, NULL) < 0)
8694                                 goto done;
8695
8696                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8697 cont:
8698                         idx++;
8699                 }
8700         }
8701 done:
8702         rcu_read_unlock();
8703
8704         cb->args[0] = idx;
8705         return skb->len;
8706 }
8707
8708 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8709 {
8710         const struct nlattr * const *nla = cb->data;
8711         struct nft_flowtable_filter *filter = NULL;
8712
8713         if (nla[NFTA_FLOWTABLE_TABLE]) {
8714                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8715                 if (!filter)
8716                         return -ENOMEM;
8717
8718                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8719                                            GFP_ATOMIC);
8720                 if (!filter->table) {
8721                         kfree(filter);
8722                         return -ENOMEM;
8723                 }
8724         }
8725
8726         cb->data = filter;
8727         return 0;
8728 }
8729
8730 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8731 {
8732         struct nft_flowtable_filter *filter = cb->data;
8733
8734         if (!filter)
8735                 return 0;
8736
8737         kfree(filter->table);
8738         kfree(filter);
8739
8740         return 0;
8741 }
8742
8743 /* called with rcu_read_lock held */
8744 static int nf_tables_getflowtable(struct sk_buff *skb,
8745                                   const struct nfnl_info *info,
8746                                   const struct nlattr * const nla[])
8747 {
8748         struct netlink_ext_ack *extack = info->extack;
8749         u8 genmask = nft_genmask_cur(info->net);
8750         u8 family = info->nfmsg->nfgen_family;
8751         struct nft_flowtable *flowtable;
8752         const struct nft_table *table;
8753         struct net *net = info->net;
8754         struct sk_buff *skb2;
8755         int err;
8756
8757         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8758                 struct netlink_dump_control c = {
8759                         .start = nf_tables_dump_flowtable_start,
8760                         .dump = nf_tables_dump_flowtable,
8761                         .done = nf_tables_dump_flowtable_done,
8762                         .module = THIS_MODULE,
8763                         .data = (void *)nla,
8764                 };
8765
8766                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8767         }
8768
8769         if (!nla[NFTA_FLOWTABLE_NAME])
8770                 return -EINVAL;
8771
8772         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8773                                  genmask, 0);
8774         if (IS_ERR(table)) {
8775                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8776                 return PTR_ERR(table);
8777         }
8778
8779         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8780                                          genmask);
8781         if (IS_ERR(flowtable)) {
8782                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8783                 return PTR_ERR(flowtable);
8784         }
8785
8786         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8787         if (!skb2)
8788                 return -ENOMEM;
8789
8790         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8791                                             info->nlh->nlmsg_seq,
8792                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8793                                             flowtable, NULL);
8794         if (err < 0)
8795                 goto err_fill_flowtable_info;
8796
8797         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8798
8799 err_fill_flowtable_info:
8800         kfree_skb(skb2);
8801         return err;
8802 }
8803
8804 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8805                                        struct nft_flowtable *flowtable,
8806                                        struct list_head *hook_list, int event)
8807 {
8808         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8809         struct sk_buff *skb;
8810         u16 flags = 0;
8811         int err;
8812
8813         if (!ctx->report &&
8814             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8815                 return;
8816
8817         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8818         if (skb == NULL)
8819                 goto err;
8820
8821         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8822                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8823
8824         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8825                                             ctx->seq, event, flags,
8826                                             ctx->family, flowtable, hook_list);
8827         if (err < 0) {
8828                 kfree_skb(skb);
8829                 goto err;
8830         }
8831
8832         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8833         return;
8834 err:
8835         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8836 }
8837
8838 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8839 {
8840         struct nft_hook *hook, *next;
8841
8842         flowtable->data.type->free(&flowtable->data);
8843         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8844                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8845                                             FLOW_BLOCK_UNBIND);
8846                 list_del_rcu(&hook->list);
8847                 kfree(hook);
8848         }
8849         kfree(flowtable->name);
8850         module_put(flowtable->data.type->owner);
8851         kfree(flowtable);
8852 }
8853
8854 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8855                                    u32 portid, u32 seq)
8856 {
8857         struct nftables_pernet *nft_net = nft_pernet(net);
8858         struct nlmsghdr *nlh;
8859         char buf[TASK_COMM_LEN];
8860         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8861
8862         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8863                            NFNETLINK_V0, nft_base_seq(net));
8864         if (!nlh)
8865                 goto nla_put_failure;
8866
8867         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8868             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8869             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8870                 goto nla_put_failure;
8871
8872         nlmsg_end(skb, nlh);
8873         return 0;
8874
8875 nla_put_failure:
8876         nlmsg_trim(skb, nlh);
8877         return -EMSGSIZE;
8878 }
8879
8880 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8881                                 struct nft_flowtable *flowtable)
8882 {
8883         struct nft_hook *hook;
8884
8885         list_for_each_entry(hook, &flowtable->hook_list, list) {
8886                 if (hook->ops.dev != dev)
8887                         continue;
8888
8889                 /* flow_offload_netdev_event() cleans up entries for us. */
8890                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8891                 list_del_rcu(&hook->list);
8892                 kfree_rcu(hook, rcu);
8893                 break;
8894         }
8895 }
8896
8897 static int nf_tables_flowtable_event(struct notifier_block *this,
8898                                      unsigned long event, void *ptr)
8899 {
8900         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8901         struct nft_flowtable *flowtable;
8902         struct nftables_pernet *nft_net;
8903         struct nft_table *table;
8904         struct net *net;
8905
8906         if (event != NETDEV_UNREGISTER)
8907                 return 0;
8908
8909         net = dev_net(dev);
8910         nft_net = nft_pernet(net);
8911         mutex_lock(&nft_net->commit_mutex);
8912         list_for_each_entry(table, &nft_net->tables, list) {
8913                 list_for_each_entry(flowtable, &table->flowtables, list) {
8914                         nft_flowtable_event(event, dev, flowtable);
8915                 }
8916         }
8917         mutex_unlock(&nft_net->commit_mutex);
8918
8919         return NOTIFY_DONE;
8920 }
8921
8922 static struct notifier_block nf_tables_flowtable_notifier = {
8923         .notifier_call  = nf_tables_flowtable_event,
8924 };
8925
8926 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8927                                  int event)
8928 {
8929         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8930         struct sk_buff *skb2;
8931         int err;
8932
8933         if (!nlmsg_report(nlh) &&
8934             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8935                 return;
8936
8937         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8938         if (skb2 == NULL)
8939                 goto err;
8940
8941         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8942                                       nlh->nlmsg_seq);
8943         if (err < 0) {
8944                 kfree_skb(skb2);
8945                 goto err;
8946         }
8947
8948         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8949                        nlmsg_report(nlh), GFP_KERNEL);
8950         return;
8951 err:
8952         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8953                           -ENOBUFS);
8954 }
8955
8956 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8957                             const struct nlattr * const nla[])
8958 {
8959         struct sk_buff *skb2;
8960         int err;
8961
8962         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8963         if (skb2 == NULL)
8964                 return -ENOMEM;
8965
8966         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8967                                       info->nlh->nlmsg_seq);
8968         if (err < 0)
8969                 goto err_fill_gen_info;
8970
8971         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8972
8973 err_fill_gen_info:
8974         kfree_skb(skb2);
8975         return err;
8976 }
8977
8978 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8979         [NFT_MSG_NEWTABLE] = {
8980                 .call           = nf_tables_newtable,
8981                 .type           = NFNL_CB_BATCH,
8982                 .attr_count     = NFTA_TABLE_MAX,
8983                 .policy         = nft_table_policy,
8984         },
8985         [NFT_MSG_GETTABLE] = {
8986                 .call           = nf_tables_gettable,
8987                 .type           = NFNL_CB_RCU,
8988                 .attr_count     = NFTA_TABLE_MAX,
8989                 .policy         = nft_table_policy,
8990         },
8991         [NFT_MSG_DELTABLE] = {
8992                 .call           = nf_tables_deltable,
8993                 .type           = NFNL_CB_BATCH,
8994                 .attr_count     = NFTA_TABLE_MAX,
8995                 .policy         = nft_table_policy,
8996         },
8997         [NFT_MSG_DESTROYTABLE] = {
8998                 .call           = nf_tables_deltable,
8999                 .type           = NFNL_CB_BATCH,
9000                 .attr_count     = NFTA_TABLE_MAX,
9001                 .policy         = nft_table_policy,
9002         },
9003         [NFT_MSG_NEWCHAIN] = {
9004                 .call           = nf_tables_newchain,
9005                 .type           = NFNL_CB_BATCH,
9006                 .attr_count     = NFTA_CHAIN_MAX,
9007                 .policy         = nft_chain_policy,
9008         },
9009         [NFT_MSG_GETCHAIN] = {
9010                 .call           = nf_tables_getchain,
9011                 .type           = NFNL_CB_RCU,
9012                 .attr_count     = NFTA_CHAIN_MAX,
9013                 .policy         = nft_chain_policy,
9014         },
9015         [NFT_MSG_DELCHAIN] = {
9016                 .call           = nf_tables_delchain,
9017                 .type           = NFNL_CB_BATCH,
9018                 .attr_count     = NFTA_CHAIN_MAX,
9019                 .policy         = nft_chain_policy,
9020         },
9021         [NFT_MSG_DESTROYCHAIN] = {
9022                 .call           = nf_tables_delchain,
9023                 .type           = NFNL_CB_BATCH,
9024                 .attr_count     = NFTA_CHAIN_MAX,
9025                 .policy         = nft_chain_policy,
9026         },
9027         [NFT_MSG_NEWRULE] = {
9028                 .call           = nf_tables_newrule,
9029                 .type           = NFNL_CB_BATCH,
9030                 .attr_count     = NFTA_RULE_MAX,
9031                 .policy         = nft_rule_policy,
9032         },
9033         [NFT_MSG_GETRULE] = {
9034                 .call           = nf_tables_getrule,
9035                 .type           = NFNL_CB_RCU,
9036                 .attr_count     = NFTA_RULE_MAX,
9037                 .policy         = nft_rule_policy,
9038         },
9039         [NFT_MSG_GETRULE_RESET] = {
9040                 .call           = nf_tables_getrule_reset,
9041                 .type           = NFNL_CB_RCU,
9042                 .attr_count     = NFTA_RULE_MAX,
9043                 .policy         = nft_rule_policy,
9044         },
9045         [NFT_MSG_DELRULE] = {
9046                 .call           = nf_tables_delrule,
9047                 .type           = NFNL_CB_BATCH,
9048                 .attr_count     = NFTA_RULE_MAX,
9049                 .policy         = nft_rule_policy,
9050         },
9051         [NFT_MSG_DESTROYRULE] = {
9052                 .call           = nf_tables_delrule,
9053                 .type           = NFNL_CB_BATCH,
9054                 .attr_count     = NFTA_RULE_MAX,
9055                 .policy         = nft_rule_policy,
9056         },
9057         [NFT_MSG_NEWSET] = {
9058                 .call           = nf_tables_newset,
9059                 .type           = NFNL_CB_BATCH,
9060                 .attr_count     = NFTA_SET_MAX,
9061                 .policy         = nft_set_policy,
9062         },
9063         [NFT_MSG_GETSET] = {
9064                 .call           = nf_tables_getset,
9065                 .type           = NFNL_CB_RCU,
9066                 .attr_count     = NFTA_SET_MAX,
9067                 .policy         = nft_set_policy,
9068         },
9069         [NFT_MSG_DELSET] = {
9070                 .call           = nf_tables_delset,
9071                 .type           = NFNL_CB_BATCH,
9072                 .attr_count     = NFTA_SET_MAX,
9073                 .policy         = nft_set_policy,
9074         },
9075         [NFT_MSG_DESTROYSET] = {
9076                 .call           = nf_tables_delset,
9077                 .type           = NFNL_CB_BATCH,
9078                 .attr_count     = NFTA_SET_MAX,
9079                 .policy         = nft_set_policy,
9080         },
9081         [NFT_MSG_NEWSETELEM] = {
9082                 .call           = nf_tables_newsetelem,
9083                 .type           = NFNL_CB_BATCH,
9084                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9085                 .policy         = nft_set_elem_list_policy,
9086         },
9087         [NFT_MSG_GETSETELEM] = {
9088                 .call           = nf_tables_getsetelem,
9089                 .type           = NFNL_CB_RCU,
9090                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9091                 .policy         = nft_set_elem_list_policy,
9092         },
9093         [NFT_MSG_GETSETELEM_RESET] = {
9094                 .call           = nf_tables_getsetelem,
9095                 .type           = NFNL_CB_RCU,
9096                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9097                 .policy         = nft_set_elem_list_policy,
9098         },
9099         [NFT_MSG_DELSETELEM] = {
9100                 .call           = nf_tables_delsetelem,
9101                 .type           = NFNL_CB_BATCH,
9102                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9103                 .policy         = nft_set_elem_list_policy,
9104         },
9105         [NFT_MSG_DESTROYSETELEM] = {
9106                 .call           = nf_tables_delsetelem,
9107                 .type           = NFNL_CB_BATCH,
9108                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9109                 .policy         = nft_set_elem_list_policy,
9110         },
9111         [NFT_MSG_GETGEN] = {
9112                 .call           = nf_tables_getgen,
9113                 .type           = NFNL_CB_RCU,
9114         },
9115         [NFT_MSG_NEWOBJ] = {
9116                 .call           = nf_tables_newobj,
9117                 .type           = NFNL_CB_BATCH,
9118                 .attr_count     = NFTA_OBJ_MAX,
9119                 .policy         = nft_obj_policy,
9120         },
9121         [NFT_MSG_GETOBJ] = {
9122                 .call           = nf_tables_getobj,
9123                 .type           = NFNL_CB_RCU,
9124                 .attr_count     = NFTA_OBJ_MAX,
9125                 .policy         = nft_obj_policy,
9126         },
9127         [NFT_MSG_DELOBJ] = {
9128                 .call           = nf_tables_delobj,
9129                 .type           = NFNL_CB_BATCH,
9130                 .attr_count     = NFTA_OBJ_MAX,
9131                 .policy         = nft_obj_policy,
9132         },
9133         [NFT_MSG_DESTROYOBJ] = {
9134                 .call           = nf_tables_delobj,
9135                 .type           = NFNL_CB_BATCH,
9136                 .attr_count     = NFTA_OBJ_MAX,
9137                 .policy         = nft_obj_policy,
9138         },
9139         [NFT_MSG_GETOBJ_RESET] = {
9140                 .call           = nf_tables_getobj,
9141                 .type           = NFNL_CB_RCU,
9142                 .attr_count     = NFTA_OBJ_MAX,
9143                 .policy         = nft_obj_policy,
9144         },
9145         [NFT_MSG_NEWFLOWTABLE] = {
9146                 .call           = nf_tables_newflowtable,
9147                 .type           = NFNL_CB_BATCH,
9148                 .attr_count     = NFTA_FLOWTABLE_MAX,
9149                 .policy         = nft_flowtable_policy,
9150         },
9151         [NFT_MSG_GETFLOWTABLE] = {
9152                 .call           = nf_tables_getflowtable,
9153                 .type           = NFNL_CB_RCU,
9154                 .attr_count     = NFTA_FLOWTABLE_MAX,
9155                 .policy         = nft_flowtable_policy,
9156         },
9157         [NFT_MSG_DELFLOWTABLE] = {
9158                 .call           = nf_tables_delflowtable,
9159                 .type           = NFNL_CB_BATCH,
9160                 .attr_count     = NFTA_FLOWTABLE_MAX,
9161                 .policy         = nft_flowtable_policy,
9162         },
9163         [NFT_MSG_DESTROYFLOWTABLE] = {
9164                 .call           = nf_tables_delflowtable,
9165                 .type           = NFNL_CB_BATCH,
9166                 .attr_count     = NFTA_FLOWTABLE_MAX,
9167                 .policy         = nft_flowtable_policy,
9168         },
9169 };
9170
9171 static int nf_tables_validate(struct net *net)
9172 {
9173         struct nftables_pernet *nft_net = nft_pernet(net);
9174         struct nft_table *table;
9175
9176         list_for_each_entry(table, &nft_net->tables, list) {
9177                 switch (table->validate_state) {
9178                 case NFT_VALIDATE_SKIP:
9179                         continue;
9180                 case NFT_VALIDATE_NEED:
9181                         nft_validate_state_update(table, NFT_VALIDATE_DO);
9182                         fallthrough;
9183                 case NFT_VALIDATE_DO:
9184                         if (nft_table_validate(net, table) < 0)
9185                                 return -EAGAIN;
9186
9187                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9188                         break;
9189                 }
9190         }
9191
9192         return 0;
9193 }
9194
9195 /* a drop policy has to be deferred until all rules have been activated,
9196  * otherwise a large ruleset that contains a drop-policy base chain will
9197  * cause all packets to get dropped until the full transaction has been
9198  * processed.
9199  *
9200  * We defer the drop policy until the transaction has been finalized.
9201  */
9202 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9203 {
9204         struct nft_base_chain *basechain;
9205
9206         if (nft_trans_chain_policy(trans) != NF_DROP)
9207                 return;
9208
9209         if (!nft_is_base_chain(trans->ctx.chain))
9210                 return;
9211
9212         basechain = nft_base_chain(trans->ctx.chain);
9213         basechain->policy = NF_DROP;
9214 }
9215
9216 static void nft_chain_commit_update(struct nft_trans *trans)
9217 {
9218         struct nft_base_chain *basechain;
9219
9220         if (nft_trans_chain_name(trans)) {
9221                 rhltable_remove(&trans->ctx.table->chains_ht,
9222                                 &trans->ctx.chain->rhlhead,
9223                                 nft_chain_ht_params);
9224                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9225                 rhltable_insert_key(&trans->ctx.table->chains_ht,
9226                                     trans->ctx.chain->name,
9227                                     &trans->ctx.chain->rhlhead,
9228                                     nft_chain_ht_params);
9229         }
9230
9231         if (!nft_is_base_chain(trans->ctx.chain))
9232                 return;
9233
9234         nft_chain_stats_replace(trans);
9235
9236         basechain = nft_base_chain(trans->ctx.chain);
9237
9238         switch (nft_trans_chain_policy(trans)) {
9239         case NF_DROP:
9240         case NF_ACCEPT:
9241                 basechain->policy = nft_trans_chain_policy(trans);
9242                 break;
9243         }
9244 }
9245
9246 static void nft_obj_commit_update(struct nft_trans *trans)
9247 {
9248         struct nft_object *newobj;
9249         struct nft_object *obj;
9250
9251         obj = nft_trans_obj(trans);
9252         newobj = nft_trans_obj_newobj(trans);
9253
9254         if (obj->ops->update)
9255                 obj->ops->update(obj, newobj);
9256
9257         nft_obj_destroy(&trans->ctx, newobj);
9258 }
9259
9260 static void nft_commit_release(struct nft_trans *trans)
9261 {
9262         switch (trans->msg_type) {
9263         case NFT_MSG_DELTABLE:
9264         case NFT_MSG_DESTROYTABLE:
9265                 nf_tables_table_destroy(&trans->ctx);
9266                 break;
9267         case NFT_MSG_NEWCHAIN:
9268                 free_percpu(nft_trans_chain_stats(trans));
9269                 kfree(nft_trans_chain_name(trans));
9270                 break;
9271         case NFT_MSG_DELCHAIN:
9272         case NFT_MSG_DESTROYCHAIN:
9273                 if (nft_trans_chain_update(trans))
9274                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9275                 else
9276                         nf_tables_chain_destroy(&trans->ctx);
9277                 break;
9278         case NFT_MSG_DELRULE:
9279         case NFT_MSG_DESTROYRULE:
9280                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9281                 break;
9282         case NFT_MSG_DELSET:
9283         case NFT_MSG_DESTROYSET:
9284                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9285                 break;
9286         case NFT_MSG_DELSETELEM:
9287         case NFT_MSG_DESTROYSETELEM:
9288                 nf_tables_set_elem_destroy(&trans->ctx,
9289                                            nft_trans_elem_set(trans),
9290                                            nft_trans_elem(trans).priv);
9291                 break;
9292         case NFT_MSG_DELOBJ:
9293         case NFT_MSG_DESTROYOBJ:
9294                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9295                 break;
9296         case NFT_MSG_DELFLOWTABLE:
9297         case NFT_MSG_DESTROYFLOWTABLE:
9298                 if (nft_trans_flowtable_update(trans))
9299                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9300                 else
9301                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9302                 break;
9303         }
9304
9305         if (trans->put_net)
9306                 put_net(trans->ctx.net);
9307
9308         kfree(trans);
9309 }
9310
9311 static void nf_tables_trans_destroy_work(struct work_struct *w)
9312 {
9313         struct nft_trans *trans, *next;
9314         LIST_HEAD(head);
9315
9316         spin_lock(&nf_tables_destroy_list_lock);
9317         list_splice_init(&nf_tables_destroy_list, &head);
9318         spin_unlock(&nf_tables_destroy_list_lock);
9319
9320         if (list_empty(&head))
9321                 return;
9322
9323         synchronize_rcu();
9324
9325         list_for_each_entry_safe(trans, next, &head, list) {
9326                 nft_trans_list_del(trans);
9327                 nft_commit_release(trans);
9328         }
9329 }
9330
9331 void nf_tables_trans_destroy_flush_work(void)
9332 {
9333         flush_work(&trans_destroy_work);
9334 }
9335 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9336
9337 static bool nft_expr_reduce(struct nft_regs_track *track,
9338                             const struct nft_expr *expr)
9339 {
9340         return false;
9341 }
9342
9343 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9344 {
9345         const struct nft_expr *expr, *last;
9346         struct nft_regs_track track = {};
9347         unsigned int size, data_size;
9348         void *data, *data_boundary;
9349         struct nft_rule_dp *prule;
9350         struct nft_rule *rule;
9351
9352         /* already handled or inactive chain? */
9353         if (chain->blob_next || !nft_is_active_next(net, chain))
9354                 return 0;
9355
9356         data_size = 0;
9357         list_for_each_entry(rule, &chain->rules, list) {
9358                 if (nft_is_active_next(net, rule)) {
9359                         data_size += sizeof(*prule) + rule->dlen;
9360                         if (data_size > INT_MAX)
9361                                 return -ENOMEM;
9362                 }
9363         }
9364
9365         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9366         if (!chain->blob_next)
9367                 return -ENOMEM;
9368
9369         data = (void *)chain->blob_next->data;
9370         data_boundary = data + data_size;
9371         size = 0;
9372
9373         list_for_each_entry(rule, &chain->rules, list) {
9374                 if (!nft_is_active_next(net, rule))
9375                         continue;
9376
9377                 prule = (struct nft_rule_dp *)data;
9378                 data += offsetof(struct nft_rule_dp, data);
9379                 if (WARN_ON_ONCE(data > data_boundary))
9380                         return -ENOMEM;
9381
9382                 size = 0;
9383                 track.last = nft_expr_last(rule);
9384                 nft_rule_for_each_expr(expr, last, rule) {
9385                         track.cur = expr;
9386
9387                         if (nft_expr_reduce(&track, expr)) {
9388                                 expr = track.cur;
9389                                 continue;
9390                         }
9391
9392                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9393                                 return -ENOMEM;
9394
9395                         memcpy(data + size, expr, expr->ops->size);
9396                         size += expr->ops->size;
9397                 }
9398                 if (WARN_ON_ONCE(size >= 1 << 12))
9399                         return -ENOMEM;
9400
9401                 prule->handle = rule->handle;
9402                 prule->dlen = size;
9403                 prule->is_last = 0;
9404
9405                 data += size;
9406                 size = 0;
9407                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9408         }
9409
9410         if (WARN_ON_ONCE(data > data_boundary))
9411                 return -ENOMEM;
9412
9413         prule = (struct nft_rule_dp *)data;
9414         nft_last_rule(chain, prule);
9415
9416         return 0;
9417 }
9418
9419 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9420 {
9421         struct nftables_pernet *nft_net = nft_pernet(net);
9422         struct nft_trans *trans, *next;
9423
9424         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9425                 struct nft_chain *chain = trans->ctx.chain;
9426
9427                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9428                     trans->msg_type == NFT_MSG_DELRULE) {
9429                         kvfree(chain->blob_next);
9430                         chain->blob_next = NULL;
9431                 }
9432         }
9433 }
9434
9435 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9436 {
9437         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9438
9439         kvfree(l->blob);
9440 }
9441
9442 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9443 {
9444         struct nft_rule_dp_last *last;
9445
9446         /* last rule trailer is after end marker */
9447         last = (void *)blob + sizeof(*blob) + blob->size;
9448         last->blob = blob;
9449
9450         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9451 }
9452
9453 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9454 {
9455         struct nft_rule_blob *g0, *g1;
9456         bool next_genbit;
9457
9458         next_genbit = nft_gencursor_next(net);
9459
9460         g0 = rcu_dereference_protected(chain->blob_gen_0,
9461                                        lockdep_commit_lock_is_held(net));
9462         g1 = rcu_dereference_protected(chain->blob_gen_1,
9463                                        lockdep_commit_lock_is_held(net));
9464
9465         /* No changes to this chain? */
9466         if (chain->blob_next == NULL) {
9467                 /* chain had no change in last or next generation */
9468                 if (g0 == g1)
9469                         return;
9470                 /*
9471                  * chain had no change in this generation; make sure next
9472                  * one uses same rules as current generation.
9473                  */
9474                 if (next_genbit) {
9475                         rcu_assign_pointer(chain->blob_gen_1, g0);
9476                         nf_tables_commit_chain_free_rules_old(g1);
9477                 } else {
9478                         rcu_assign_pointer(chain->blob_gen_0, g1);
9479                         nf_tables_commit_chain_free_rules_old(g0);
9480                 }
9481
9482                 return;
9483         }
9484
9485         if (next_genbit)
9486                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9487         else
9488                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9489
9490         chain->blob_next = NULL;
9491
9492         if (g0 == g1)
9493                 return;
9494
9495         if (next_genbit)
9496                 nf_tables_commit_chain_free_rules_old(g1);
9497         else
9498                 nf_tables_commit_chain_free_rules_old(g0);
9499 }
9500
9501 static void nft_obj_del(struct nft_object *obj)
9502 {
9503         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9504         list_del_rcu(&obj->list);
9505 }
9506
9507 void nft_chain_del(struct nft_chain *chain)
9508 {
9509         struct nft_table *table = chain->table;
9510
9511         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9512                                      nft_chain_ht_params));
9513         list_del_rcu(&chain->list);
9514 }
9515
9516 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9517                                         struct nft_trans_gc *trans)
9518 {
9519         void **priv = trans->priv;
9520         unsigned int i;
9521
9522         for (i = 0; i < trans->count; i++) {
9523                 struct nft_set_elem elem = {
9524                         .priv = priv[i],
9525                 };
9526
9527                 nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9528                 nft_setelem_remove(ctx->net, trans->set, &elem);
9529         }
9530 }
9531
9532 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9533 {
9534         nft_set_put(trans->set);
9535         put_net(trans->net);
9536         kfree(trans);
9537 }
9538
9539 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9540 {
9541         struct nft_set_elem elem = {};
9542         struct nft_trans_gc *trans;
9543         struct nft_ctx ctx = {};
9544         unsigned int i;
9545
9546         trans = container_of(rcu, struct nft_trans_gc, rcu);
9547         ctx.net = read_pnet(&trans->set->net);
9548
9549         for (i = 0; i < trans->count; i++) {
9550                 elem.priv = trans->priv[i];
9551                 if (!nft_setelem_is_catchall(trans->set, &elem))
9552                         atomic_dec(&trans->set->nelems);
9553
9554                 nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9555         }
9556
9557         nft_trans_gc_destroy(trans);
9558 }
9559
9560 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9561 {
9562         struct nftables_pernet *nft_net;
9563         struct nft_ctx ctx = {};
9564
9565         nft_net = nft_pernet(trans->net);
9566
9567         mutex_lock(&nft_net->commit_mutex);
9568
9569         /* Check for race with transaction, otherwise this batch refers to
9570          * stale objects that might not be there anymore. Skip transaction if
9571          * set has been destroyed from control plane transaction in case gc
9572          * worker loses race.
9573          */
9574         if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9575                 mutex_unlock(&nft_net->commit_mutex);
9576                 return false;
9577         }
9578
9579         ctx.net = trans->net;
9580         ctx.table = trans->set->table;
9581
9582         nft_trans_gc_setelem_remove(&ctx, trans);
9583         mutex_unlock(&nft_net->commit_mutex);
9584
9585         return true;
9586 }
9587
9588 static void nft_trans_gc_work(struct work_struct *work)
9589 {
9590         struct nft_trans_gc *trans, *next;
9591         LIST_HEAD(trans_gc_list);
9592
9593         spin_lock(&nf_tables_gc_list_lock);
9594         list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9595         spin_unlock(&nf_tables_gc_list_lock);
9596
9597         list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9598                 list_del(&trans->list);
9599                 if (!nft_trans_gc_work_done(trans)) {
9600                         nft_trans_gc_destroy(trans);
9601                         continue;
9602                 }
9603                 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9604         }
9605 }
9606
9607 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9608                                         unsigned int gc_seq, gfp_t gfp)
9609 {
9610         struct net *net = read_pnet(&set->net);
9611         struct nft_trans_gc *trans;
9612
9613         trans = kzalloc(sizeof(*trans), gfp);
9614         if (!trans)
9615                 return NULL;
9616
9617         trans->net = maybe_get_net(net);
9618         if (!trans->net) {
9619                 kfree(trans);
9620                 return NULL;
9621         }
9622
9623         refcount_inc(&set->refs);
9624         trans->set = set;
9625         trans->seq = gc_seq;
9626
9627         return trans;
9628 }
9629
9630 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9631 {
9632         trans->priv[trans->count++] = priv;
9633 }
9634
9635 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9636 {
9637         spin_lock(&nf_tables_gc_list_lock);
9638         list_add_tail(&trans->list, &nf_tables_gc_list);
9639         spin_unlock(&nf_tables_gc_list_lock);
9640
9641         schedule_work(&trans_gc_work);
9642 }
9643
9644 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9645 {
9646         return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9647 }
9648
9649 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9650                                               unsigned int gc_seq, gfp_t gfp)
9651 {
9652         struct nft_set *set;
9653
9654         if (nft_trans_gc_space(gc))
9655                 return gc;
9656
9657         set = gc->set;
9658         nft_trans_gc_queue_work(gc);
9659
9660         return nft_trans_gc_alloc(set, gc_seq, gfp);
9661 }
9662
9663 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9664 {
9665         if (trans->count == 0) {
9666                 nft_trans_gc_destroy(trans);
9667                 return;
9668         }
9669
9670         nft_trans_gc_queue_work(trans);
9671 }
9672
9673 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9674 {
9675         struct nft_set *set;
9676
9677         if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9678                 return NULL;
9679
9680         if (nft_trans_gc_space(gc))
9681                 return gc;
9682
9683         set = gc->set;
9684         call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9685
9686         return nft_trans_gc_alloc(set, 0, gfp);
9687 }
9688
9689 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9690 {
9691         WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9692
9693         if (trans->count == 0) {
9694                 nft_trans_gc_destroy(trans);
9695                 return;
9696         }
9697
9698         call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9699 }
9700
9701 static struct nft_trans_gc *nft_trans_gc_catchall(struct nft_trans_gc *gc,
9702                                                   unsigned int gc_seq,
9703                                                   bool sync)
9704 {
9705         struct nft_set_elem_catchall *catchall;
9706         const struct nft_set *set = gc->set;
9707         struct nft_set_ext *ext;
9708
9709         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9710                 ext = nft_set_elem_ext(set, catchall->elem);
9711
9712                 if (!nft_set_elem_expired(ext))
9713                         continue;
9714                 if (nft_set_elem_is_dead(ext))
9715                         goto dead_elem;
9716
9717                 nft_set_elem_dead(ext);
9718 dead_elem:
9719                 if (sync)
9720                         gc = nft_trans_gc_queue_sync(gc, GFP_ATOMIC);
9721                 else
9722                         gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9723
9724                 if (!gc)
9725                         return NULL;
9726
9727                 nft_trans_gc_elem_add(gc, catchall->elem);
9728         }
9729
9730         return gc;
9731 }
9732
9733 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9734                                                  unsigned int gc_seq)
9735 {
9736         return nft_trans_gc_catchall(gc, gc_seq, false);
9737 }
9738
9739 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9740 {
9741         return nft_trans_gc_catchall(gc, 0, true);
9742 }
9743
9744 static void nf_tables_module_autoload_cleanup(struct net *net)
9745 {
9746         struct nftables_pernet *nft_net = nft_pernet(net);
9747         struct nft_module_request *req, *next;
9748
9749         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9750         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9751                 WARN_ON_ONCE(!req->done);
9752                 list_del(&req->list);
9753                 kfree(req);
9754         }
9755 }
9756
9757 static void nf_tables_commit_release(struct net *net)
9758 {
9759         struct nftables_pernet *nft_net = nft_pernet(net);
9760         struct nft_trans *trans;
9761
9762         /* all side effects have to be made visible.
9763          * For example, if a chain named 'foo' has been deleted, a
9764          * new transaction must not find it anymore.
9765          *
9766          * Memory reclaim happens asynchronously from work queue
9767          * to prevent expensive synchronize_rcu() in commit phase.
9768          */
9769         if (list_empty(&nft_net->commit_list)) {
9770                 nf_tables_module_autoload_cleanup(net);
9771                 mutex_unlock(&nft_net->commit_mutex);
9772                 return;
9773         }
9774
9775         trans = list_last_entry(&nft_net->commit_list,
9776                                 struct nft_trans, list);
9777         get_net(trans->ctx.net);
9778         WARN_ON_ONCE(trans->put_net);
9779
9780         trans->put_net = true;
9781         spin_lock(&nf_tables_destroy_list_lock);
9782         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9783         spin_unlock(&nf_tables_destroy_list_lock);
9784
9785         nf_tables_module_autoload_cleanup(net);
9786         schedule_work(&trans_destroy_work);
9787
9788         mutex_unlock(&nft_net->commit_mutex);
9789 }
9790
9791 static void nft_commit_notify(struct net *net, u32 portid)
9792 {
9793         struct nftables_pernet *nft_net = nft_pernet(net);
9794         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9795         unsigned char *data;
9796         int len;
9797
9798         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9799                 if (!batch_skb) {
9800 new_batch:
9801                         batch_skb = skb;
9802                         len = NLMSG_GOODSIZE - skb->len;
9803                         list_del(&skb->list);
9804                         continue;
9805                 }
9806                 len -= skb->len;
9807                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9808                         data = skb_put(batch_skb, skb->len);
9809                         memcpy(data, skb->data, skb->len);
9810                         list_del(&skb->list);
9811                         kfree_skb(skb);
9812                         continue;
9813                 }
9814                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9815                                NFT_CB(batch_skb).report, GFP_KERNEL);
9816                 goto new_batch;
9817         }
9818
9819         if (batch_skb) {
9820                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9821                                NFT_CB(batch_skb).report, GFP_KERNEL);
9822         }
9823
9824         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9825 }
9826
9827 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9828                                         struct nft_table *table)
9829 {
9830         struct nft_audit_data *adp;
9831
9832         list_for_each_entry(adp, adl, list) {
9833                 if (adp->table == table)
9834                         return 0;
9835         }
9836         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9837         if (!adp)
9838                 return -ENOMEM;
9839         adp->table = table;
9840         list_add(&adp->list, adl);
9841         return 0;
9842 }
9843
9844 static void nf_tables_commit_audit_free(struct list_head *adl)
9845 {
9846         struct nft_audit_data *adp, *adn;
9847
9848         list_for_each_entry_safe(adp, adn, adl, list) {
9849                 list_del(&adp->list);
9850                 kfree(adp);
9851         }
9852 }
9853
9854 static void nf_tables_commit_audit_collect(struct list_head *adl,
9855                                            struct nft_table *table, u32 op)
9856 {
9857         struct nft_audit_data *adp;
9858
9859         list_for_each_entry(adp, adl, list) {
9860                 if (adp->table == table)
9861                         goto found;
9862         }
9863         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9864         return;
9865 found:
9866         adp->entries++;
9867         if (!adp->op || adp->op > op)
9868                 adp->op = op;
9869 }
9870
9871 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9872
9873 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9874 {
9875         struct nft_audit_data *adp, *adn;
9876         char aubuf[AUNFTABLENAMELEN];
9877
9878         list_for_each_entry_safe(adp, adn, adl, list) {
9879                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9880                          generation);
9881                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9882                                 nft2audit_op[adp->op], GFP_KERNEL);
9883                 list_del(&adp->list);
9884                 kfree(adp);
9885         }
9886 }
9887
9888 static void nft_set_commit_update(struct list_head *set_update_list)
9889 {
9890         struct nft_set *set, *next;
9891
9892         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9893                 list_del_init(&set->pending_update);
9894
9895                 if (!set->ops->commit)
9896                         continue;
9897
9898                 set->ops->commit(set);
9899         }
9900 }
9901
9902 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
9903 {
9904         unsigned int gc_seq;
9905
9906         /* Bump gc counter, it becomes odd, this is the busy mark. */
9907         gc_seq = READ_ONCE(nft_net->gc_seq);
9908         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9909
9910         return gc_seq;
9911 }
9912
9913 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
9914 {
9915         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9916 }
9917
9918 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9919 {
9920         struct nftables_pernet *nft_net = nft_pernet(net);
9921         struct nft_trans *trans, *next;
9922         unsigned int base_seq, gc_seq;
9923         LIST_HEAD(set_update_list);
9924         struct nft_trans_elem *te;
9925         struct nft_chain *chain;
9926         struct nft_table *table;
9927         LIST_HEAD(adl);
9928         int err;
9929
9930         if (list_empty(&nft_net->commit_list)) {
9931                 mutex_unlock(&nft_net->commit_mutex);
9932                 return 0;
9933         }
9934
9935         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9936                 switch (trans->msg_type) {
9937                 case NFT_MSG_NEWSET:
9938                         if (!nft_trans_set_update(trans) &&
9939                             nft_set_is_anonymous(nft_trans_set(trans)) &&
9940                             !nft_trans_set_bound(trans)) {
9941                                 pr_warn_once("nftables ruleset with unbound set\n");
9942                                 return -EINVAL;
9943                         }
9944                         break;
9945                 case NFT_MSG_NEWCHAIN:
9946                         if (!nft_trans_chain_update(trans) &&
9947                             nft_chain_binding(nft_trans_chain(trans)) &&
9948                             !nft_trans_chain_bound(trans)) {
9949                                 pr_warn_once("nftables ruleset with unbound chain\n");
9950                                 return -EINVAL;
9951                         }
9952                         break;
9953                 }
9954         }
9955
9956         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9957         if (nf_tables_validate(net) < 0) {
9958                 nft_net->validate_state = NFT_VALIDATE_DO;
9959                 return -EAGAIN;
9960         }
9961
9962         err = nft_flow_rule_offload_commit(net);
9963         if (err < 0)
9964                 return err;
9965
9966         /* 1.  Allocate space for next generation rules_gen_X[] */
9967         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9968                 int ret;
9969
9970                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9971                 if (ret) {
9972                         nf_tables_commit_chain_prepare_cancel(net);
9973                         nf_tables_commit_audit_free(&adl);
9974                         return ret;
9975                 }
9976                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9977                     trans->msg_type == NFT_MSG_DELRULE) {
9978                         chain = trans->ctx.chain;
9979
9980                         ret = nf_tables_commit_chain_prepare(net, chain);
9981                         if (ret < 0) {
9982                                 nf_tables_commit_chain_prepare_cancel(net);
9983                                 nf_tables_commit_audit_free(&adl);
9984                                 return ret;
9985                         }
9986                 }
9987         }
9988
9989         /* step 2.  Make rules_gen_X visible to packet path */
9990         list_for_each_entry(table, &nft_net->tables, list) {
9991                 list_for_each_entry(chain, &table->chains, list)
9992                         nf_tables_commit_chain(net, chain);
9993         }
9994
9995         /*
9996          * Bump generation counter, invalidate any dump in progress.
9997          * Cannot fail after this point.
9998          */
9999         base_seq = READ_ONCE(nft_net->base_seq);
10000         while (++base_seq == 0)
10001                 ;
10002
10003         WRITE_ONCE(nft_net->base_seq, base_seq);
10004
10005         gc_seq = nft_gc_seq_begin(nft_net);
10006
10007         /* step 3. Start new generation, rules_gen_X now in use. */
10008         net->nft.gencursor = nft_gencursor_next(net);
10009
10010         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10011                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
10012                                                trans->msg_type);
10013                 switch (trans->msg_type) {
10014                 case NFT_MSG_NEWTABLE:
10015                         if (nft_trans_table_update(trans)) {
10016                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10017                                         nft_trans_destroy(trans);
10018                                         break;
10019                                 }
10020                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10021                                         nf_tables_table_disable(net, trans->ctx.table);
10022
10023                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10024                         } else {
10025                                 nft_clear(net, trans->ctx.table);
10026                         }
10027                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10028                         nft_trans_destroy(trans);
10029                         break;
10030                 case NFT_MSG_DELTABLE:
10031                 case NFT_MSG_DESTROYTABLE:
10032                         list_del_rcu(&trans->ctx.table->list);
10033                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
10034                         break;
10035                 case NFT_MSG_NEWCHAIN:
10036                         if (nft_trans_chain_update(trans)) {
10037                                 nft_chain_commit_update(trans);
10038                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10039                                                        &nft_trans_chain_hooks(trans));
10040                                 list_splice(&nft_trans_chain_hooks(trans),
10041                                             &nft_trans_basechain(trans)->hook_list);
10042                                 /* trans destroyed after rcu grace period */
10043                         } else {
10044                                 nft_chain_commit_drop_policy(trans);
10045                                 nft_clear(net, trans->ctx.chain);
10046                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10047                                 nft_trans_destroy(trans);
10048                         }
10049                         break;
10050                 case NFT_MSG_DELCHAIN:
10051                 case NFT_MSG_DESTROYCHAIN:
10052                         if (nft_trans_chain_update(trans)) {
10053                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10054                                                        &nft_trans_chain_hooks(trans));
10055                                 nft_netdev_unregister_hooks(net,
10056                                                             &nft_trans_chain_hooks(trans),
10057                                                             true);
10058                         } else {
10059                                 nft_chain_del(trans->ctx.chain);
10060                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10061                                                        NULL);
10062                                 nf_tables_unregister_hook(trans->ctx.net,
10063                                                           trans->ctx.table,
10064                                                           trans->ctx.chain);
10065                         }
10066                         break;
10067                 case NFT_MSG_NEWRULE:
10068                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10069                         nf_tables_rule_notify(&trans->ctx,
10070                                               nft_trans_rule(trans),
10071                                               NFT_MSG_NEWRULE);
10072                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10073                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10074
10075                         nft_trans_destroy(trans);
10076                         break;
10077                 case NFT_MSG_DELRULE:
10078                 case NFT_MSG_DESTROYRULE:
10079                         list_del_rcu(&nft_trans_rule(trans)->list);
10080                         nf_tables_rule_notify(&trans->ctx,
10081                                               nft_trans_rule(trans),
10082                                               trans->msg_type);
10083                         nft_rule_expr_deactivate(&trans->ctx,
10084                                                  nft_trans_rule(trans),
10085                                                  NFT_TRANS_COMMIT);
10086
10087                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10088                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10089                         break;
10090                 case NFT_MSG_NEWSET:
10091                         if (nft_trans_set_update(trans)) {
10092                                 struct nft_set *set = nft_trans_set(trans);
10093
10094                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10095                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10096
10097                                 if (nft_trans_set_size(trans))
10098                                         WRITE_ONCE(set->size, nft_trans_set_size(trans));
10099                         } else {
10100                                 nft_clear(net, nft_trans_set(trans));
10101                                 /* This avoids hitting -EBUSY when deleting the table
10102                                  * from the transaction.
10103                                  */
10104                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10105                                     !list_empty(&nft_trans_set(trans)->bindings))
10106                                         nft_use_dec(&trans->ctx.table->use);
10107                         }
10108                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10109                                              NFT_MSG_NEWSET, GFP_KERNEL);
10110                         nft_trans_destroy(trans);
10111                         break;
10112                 case NFT_MSG_DELSET:
10113                 case NFT_MSG_DESTROYSET:
10114                         nft_trans_set(trans)->dead = 1;
10115                         list_del_rcu(&nft_trans_set(trans)->list);
10116                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10117                                              trans->msg_type, GFP_KERNEL);
10118                         break;
10119                 case NFT_MSG_NEWSETELEM:
10120                         te = (struct nft_trans_elem *)trans->data;
10121
10122                         nft_setelem_activate(net, te->set, &te->elem);
10123                         nf_tables_setelem_notify(&trans->ctx, te->set,
10124                                                  &te->elem,
10125                                                  NFT_MSG_NEWSETELEM);
10126                         if (te->set->ops->commit &&
10127                             list_empty(&te->set->pending_update)) {
10128                                 list_add_tail(&te->set->pending_update,
10129                                               &set_update_list);
10130                         }
10131                         nft_trans_destroy(trans);
10132                         break;
10133                 case NFT_MSG_DELSETELEM:
10134                 case NFT_MSG_DESTROYSETELEM:
10135                         te = (struct nft_trans_elem *)trans->data;
10136
10137                         nf_tables_setelem_notify(&trans->ctx, te->set,
10138                                                  &te->elem,
10139                                                  trans->msg_type);
10140                         nft_setelem_remove(net, te->set, &te->elem);
10141                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
10142                                 atomic_dec(&te->set->nelems);
10143                                 te->set->ndeact--;
10144                         }
10145                         if (te->set->ops->commit &&
10146                             list_empty(&te->set->pending_update)) {
10147                                 list_add_tail(&te->set->pending_update,
10148                                               &set_update_list);
10149                         }
10150                         break;
10151                 case NFT_MSG_NEWOBJ:
10152                         if (nft_trans_obj_update(trans)) {
10153                                 nft_obj_commit_update(trans);
10154                                 nf_tables_obj_notify(&trans->ctx,
10155                                                      nft_trans_obj(trans),
10156                                                      NFT_MSG_NEWOBJ);
10157                         } else {
10158                                 nft_clear(net, nft_trans_obj(trans));
10159                                 nf_tables_obj_notify(&trans->ctx,
10160                                                      nft_trans_obj(trans),
10161                                                      NFT_MSG_NEWOBJ);
10162                                 nft_trans_destroy(trans);
10163                         }
10164                         break;
10165                 case NFT_MSG_DELOBJ:
10166                 case NFT_MSG_DESTROYOBJ:
10167                         nft_obj_del(nft_trans_obj(trans));
10168                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10169                                              trans->msg_type);
10170                         break;
10171                 case NFT_MSG_NEWFLOWTABLE:
10172                         if (nft_trans_flowtable_update(trans)) {
10173                                 nft_trans_flowtable(trans)->data.flags =
10174                                         nft_trans_flowtable_flags(trans);
10175                                 nf_tables_flowtable_notify(&trans->ctx,
10176                                                            nft_trans_flowtable(trans),
10177                                                            &nft_trans_flowtable_hooks(trans),
10178                                                            NFT_MSG_NEWFLOWTABLE);
10179                                 list_splice(&nft_trans_flowtable_hooks(trans),
10180                                             &nft_trans_flowtable(trans)->hook_list);
10181                         } else {
10182                                 nft_clear(net, nft_trans_flowtable(trans));
10183                                 nf_tables_flowtable_notify(&trans->ctx,
10184                                                            nft_trans_flowtable(trans),
10185                                                            NULL,
10186                                                            NFT_MSG_NEWFLOWTABLE);
10187                         }
10188                         nft_trans_destroy(trans);
10189                         break;
10190                 case NFT_MSG_DELFLOWTABLE:
10191                 case NFT_MSG_DESTROYFLOWTABLE:
10192                         if (nft_trans_flowtable_update(trans)) {
10193                                 nf_tables_flowtable_notify(&trans->ctx,
10194                                                            nft_trans_flowtable(trans),
10195                                                            &nft_trans_flowtable_hooks(trans),
10196                                                            trans->msg_type);
10197                                 nft_unregister_flowtable_net_hooks(net,
10198                                                                    &nft_trans_flowtable_hooks(trans));
10199                         } else {
10200                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10201                                 nf_tables_flowtable_notify(&trans->ctx,
10202                                                            nft_trans_flowtable(trans),
10203                                                            NULL,
10204                                                            trans->msg_type);
10205                                 nft_unregister_flowtable_net_hooks(net,
10206                                                 &nft_trans_flowtable(trans)->hook_list);
10207                         }
10208                         break;
10209                 }
10210         }
10211
10212         nft_set_commit_update(&set_update_list);
10213
10214         nft_commit_notify(net, NETLINK_CB(skb).portid);
10215         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10216         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10217
10218         nft_gc_seq_end(nft_net, gc_seq);
10219         nft_net->validate_state = NFT_VALIDATE_SKIP;
10220         nf_tables_commit_release(net);
10221
10222         return 0;
10223 }
10224
10225 static void nf_tables_module_autoload(struct net *net)
10226 {
10227         struct nftables_pernet *nft_net = nft_pernet(net);
10228         struct nft_module_request *req, *next;
10229         LIST_HEAD(module_list);
10230
10231         list_splice_init(&nft_net->module_list, &module_list);
10232         mutex_unlock(&nft_net->commit_mutex);
10233         list_for_each_entry_safe(req, next, &module_list, list) {
10234                 request_module("%s", req->module);
10235                 req->done = true;
10236         }
10237         mutex_lock(&nft_net->commit_mutex);
10238         list_splice(&module_list, &nft_net->module_list);
10239 }
10240
10241 static void nf_tables_abort_release(struct nft_trans *trans)
10242 {
10243         switch (trans->msg_type) {
10244         case NFT_MSG_NEWTABLE:
10245                 nf_tables_table_destroy(&trans->ctx);
10246                 break;
10247         case NFT_MSG_NEWCHAIN:
10248                 if (nft_trans_chain_update(trans))
10249                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10250                 else
10251                         nf_tables_chain_destroy(&trans->ctx);
10252                 break;
10253         case NFT_MSG_NEWRULE:
10254                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10255                 break;
10256         case NFT_MSG_NEWSET:
10257                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10258                 break;
10259         case NFT_MSG_NEWSETELEM:
10260                 nft_set_elem_destroy(nft_trans_elem_set(trans),
10261                                      nft_trans_elem(trans).priv, true);
10262                 break;
10263         case NFT_MSG_NEWOBJ:
10264                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10265                 break;
10266         case NFT_MSG_NEWFLOWTABLE:
10267                 if (nft_trans_flowtable_update(trans))
10268                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10269                 else
10270                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10271                 break;
10272         }
10273         kfree(trans);
10274 }
10275
10276 static void nft_set_abort_update(struct list_head *set_update_list)
10277 {
10278         struct nft_set *set, *next;
10279
10280         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10281                 list_del_init(&set->pending_update);
10282
10283                 if (!set->ops->abort)
10284                         continue;
10285
10286                 set->ops->abort(set);
10287         }
10288 }
10289
10290 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10291 {
10292         struct nftables_pernet *nft_net = nft_pernet(net);
10293         struct nft_trans *trans, *next;
10294         LIST_HEAD(set_update_list);
10295         struct nft_trans_elem *te;
10296
10297         if (action == NFNL_ABORT_VALIDATE &&
10298             nf_tables_validate(net) < 0)
10299                 return -EAGAIN;
10300
10301         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10302                                          list) {
10303                 switch (trans->msg_type) {
10304                 case NFT_MSG_NEWTABLE:
10305                         if (nft_trans_table_update(trans)) {
10306                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10307                                         nft_trans_destroy(trans);
10308                                         break;
10309                                 }
10310                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10311                                         nf_tables_table_disable(net, trans->ctx.table);
10312                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10313                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10314                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10315                                 }
10316                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10317                                 nft_trans_destroy(trans);
10318                         } else {
10319                                 list_del_rcu(&trans->ctx.table->list);
10320                         }
10321                         break;
10322                 case NFT_MSG_DELTABLE:
10323                 case NFT_MSG_DESTROYTABLE:
10324                         nft_clear(trans->ctx.net, trans->ctx.table);
10325                         nft_trans_destroy(trans);
10326                         break;
10327                 case NFT_MSG_NEWCHAIN:
10328                         if (nft_trans_chain_update(trans)) {
10329                                 nft_netdev_unregister_hooks(net,
10330                                                             &nft_trans_chain_hooks(trans),
10331                                                             true);
10332                                 free_percpu(nft_trans_chain_stats(trans));
10333                                 kfree(nft_trans_chain_name(trans));
10334                                 nft_trans_destroy(trans);
10335                         } else {
10336                                 if (nft_trans_chain_bound(trans)) {
10337                                         nft_trans_destroy(trans);
10338                                         break;
10339                                 }
10340                                 nft_use_dec_restore(&trans->ctx.table->use);
10341                                 nft_chain_del(trans->ctx.chain);
10342                                 nf_tables_unregister_hook(trans->ctx.net,
10343                                                           trans->ctx.table,
10344                                                           trans->ctx.chain);
10345                         }
10346                         break;
10347                 case NFT_MSG_DELCHAIN:
10348                 case NFT_MSG_DESTROYCHAIN:
10349                         if (nft_trans_chain_update(trans)) {
10350                                 list_splice(&nft_trans_chain_hooks(trans),
10351                                             &nft_trans_basechain(trans)->hook_list);
10352                         } else {
10353                                 nft_use_inc_restore(&trans->ctx.table->use);
10354                                 nft_clear(trans->ctx.net, trans->ctx.chain);
10355                         }
10356                         nft_trans_destroy(trans);
10357                         break;
10358                 case NFT_MSG_NEWRULE:
10359                         if (nft_trans_rule_bound(trans)) {
10360                                 nft_trans_destroy(trans);
10361                                 break;
10362                         }
10363                         nft_use_dec_restore(&trans->ctx.chain->use);
10364                         list_del_rcu(&nft_trans_rule(trans)->list);
10365                         nft_rule_expr_deactivate(&trans->ctx,
10366                                                  nft_trans_rule(trans),
10367                                                  NFT_TRANS_ABORT);
10368                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10369                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10370                         break;
10371                 case NFT_MSG_DELRULE:
10372                 case NFT_MSG_DESTROYRULE:
10373                         nft_use_inc_restore(&trans->ctx.chain->use);
10374                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10375                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10376                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10377                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10378
10379                         nft_trans_destroy(trans);
10380                         break;
10381                 case NFT_MSG_NEWSET:
10382                         if (nft_trans_set_update(trans)) {
10383                                 nft_trans_destroy(trans);
10384                                 break;
10385                         }
10386                         nft_use_dec_restore(&trans->ctx.table->use);
10387                         if (nft_trans_set_bound(trans)) {
10388                                 nft_trans_destroy(trans);
10389                                 break;
10390                         }
10391                         list_del_rcu(&nft_trans_set(trans)->list);
10392                         break;
10393                 case NFT_MSG_DELSET:
10394                 case NFT_MSG_DESTROYSET:
10395                         nft_use_inc_restore(&trans->ctx.table->use);
10396                         nft_clear(trans->ctx.net, nft_trans_set(trans));
10397                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10398                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10399
10400                         nft_trans_destroy(trans);
10401                         break;
10402                 case NFT_MSG_NEWSETELEM:
10403                         if (nft_trans_elem_set_bound(trans)) {
10404                                 nft_trans_destroy(trans);
10405                                 break;
10406                         }
10407                         te = (struct nft_trans_elem *)trans->data;
10408                         nft_setelem_remove(net, te->set, &te->elem);
10409                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10410                                 atomic_dec(&te->set->nelems);
10411
10412                         if (te->set->ops->abort &&
10413                             list_empty(&te->set->pending_update)) {
10414                                 list_add_tail(&te->set->pending_update,
10415                                               &set_update_list);
10416                         }
10417                         break;
10418                 case NFT_MSG_DELSETELEM:
10419                 case NFT_MSG_DESTROYSETELEM:
10420                         te = (struct nft_trans_elem *)trans->data;
10421
10422                         nft_setelem_data_activate(net, te->set, &te->elem);
10423                         nft_setelem_activate(net, te->set, &te->elem);
10424                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10425                                 te->set->ndeact--;
10426
10427                         if (te->set->ops->abort &&
10428                             list_empty(&te->set->pending_update)) {
10429                                 list_add_tail(&te->set->pending_update,
10430                                               &set_update_list);
10431                         }
10432                         nft_trans_destroy(trans);
10433                         break;
10434                 case NFT_MSG_NEWOBJ:
10435                         if (nft_trans_obj_update(trans)) {
10436                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10437                                 nft_trans_destroy(trans);
10438                         } else {
10439                                 nft_use_dec_restore(&trans->ctx.table->use);
10440                                 nft_obj_del(nft_trans_obj(trans));
10441                         }
10442                         break;
10443                 case NFT_MSG_DELOBJ:
10444                 case NFT_MSG_DESTROYOBJ:
10445                         nft_use_inc_restore(&trans->ctx.table->use);
10446                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
10447                         nft_trans_destroy(trans);
10448                         break;
10449                 case NFT_MSG_NEWFLOWTABLE:
10450                         if (nft_trans_flowtable_update(trans)) {
10451                                 nft_unregister_flowtable_net_hooks(net,
10452                                                 &nft_trans_flowtable_hooks(trans));
10453                         } else {
10454                                 nft_use_dec_restore(&trans->ctx.table->use);
10455                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10456                                 nft_unregister_flowtable_net_hooks(net,
10457                                                 &nft_trans_flowtable(trans)->hook_list);
10458                         }
10459                         break;
10460                 case NFT_MSG_DELFLOWTABLE:
10461                 case NFT_MSG_DESTROYFLOWTABLE:
10462                         if (nft_trans_flowtable_update(trans)) {
10463                                 list_splice(&nft_trans_flowtable_hooks(trans),
10464                                             &nft_trans_flowtable(trans)->hook_list);
10465                         } else {
10466                                 nft_use_inc_restore(&trans->ctx.table->use);
10467                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10468                         }
10469                         nft_trans_destroy(trans);
10470                         break;
10471                 }
10472         }
10473
10474         nft_set_abort_update(&set_update_list);
10475
10476         synchronize_rcu();
10477
10478         list_for_each_entry_safe_reverse(trans, next,
10479                                          &nft_net->commit_list, list) {
10480                 nft_trans_list_del(trans);
10481                 nf_tables_abort_release(trans);
10482         }
10483
10484         if (action == NFNL_ABORT_AUTOLOAD)
10485                 nf_tables_module_autoload(net);
10486         else
10487                 nf_tables_module_autoload_cleanup(net);
10488
10489         return 0;
10490 }
10491
10492 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10493                            enum nfnl_abort_action action)
10494 {
10495         struct nftables_pernet *nft_net = nft_pernet(net);
10496         unsigned int gc_seq;
10497         int ret;
10498
10499         gc_seq = nft_gc_seq_begin(nft_net);
10500         ret = __nf_tables_abort(net, action);
10501         nft_gc_seq_end(nft_net, gc_seq);
10502         mutex_unlock(&nft_net->commit_mutex);
10503
10504         return ret;
10505 }
10506
10507 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10508 {
10509         struct nftables_pernet *nft_net = nft_pernet(net);
10510         bool genid_ok;
10511
10512         mutex_lock(&nft_net->commit_mutex);
10513
10514         genid_ok = genid == 0 || nft_net->base_seq == genid;
10515         if (!genid_ok)
10516                 mutex_unlock(&nft_net->commit_mutex);
10517
10518         /* else, commit mutex has to be released by commit or abort function */
10519         return genid_ok;
10520 }
10521
10522 static const struct nfnetlink_subsystem nf_tables_subsys = {
10523         .name           = "nf_tables",
10524         .subsys_id      = NFNL_SUBSYS_NFTABLES,
10525         .cb_count       = NFT_MSG_MAX,
10526         .cb             = nf_tables_cb,
10527         .commit         = nf_tables_commit,
10528         .abort          = nf_tables_abort,
10529         .valid_genid    = nf_tables_valid_genid,
10530         .owner          = THIS_MODULE,
10531 };
10532
10533 int nft_chain_validate_dependency(const struct nft_chain *chain,
10534                                   enum nft_chain_types type)
10535 {
10536         const struct nft_base_chain *basechain;
10537
10538         if (nft_is_base_chain(chain)) {
10539                 basechain = nft_base_chain(chain);
10540                 if (basechain->type->type != type)
10541                         return -EOPNOTSUPP;
10542         }
10543         return 0;
10544 }
10545 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10546
10547 int nft_chain_validate_hooks(const struct nft_chain *chain,
10548                              unsigned int hook_flags)
10549 {
10550         struct nft_base_chain *basechain;
10551
10552         if (nft_is_base_chain(chain)) {
10553                 basechain = nft_base_chain(chain);
10554
10555                 if ((1 << basechain->ops.hooknum) & hook_flags)
10556                         return 0;
10557
10558                 return -EOPNOTSUPP;
10559         }
10560
10561         return 0;
10562 }
10563 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10564
10565 /*
10566  * Loop detection - walk through the ruleset beginning at the destination chain
10567  * of a new jump until either the source chain is reached (loop) or all
10568  * reachable chains have been traversed.
10569  *
10570  * The loop check is performed whenever a new jump verdict is added to an
10571  * expression or verdict map or a verdict map is bound to a new chain.
10572  */
10573
10574 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10575                                  const struct nft_chain *chain);
10576
10577 static int nft_check_loops(const struct nft_ctx *ctx,
10578                            const struct nft_set_ext *ext)
10579 {
10580         const struct nft_data *data;
10581         int ret;
10582
10583         data = nft_set_ext_data(ext);
10584         switch (data->verdict.code) {
10585         case NFT_JUMP:
10586         case NFT_GOTO:
10587                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10588                 break;
10589         default:
10590                 ret = 0;
10591                 break;
10592         }
10593
10594         return ret;
10595 }
10596
10597 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10598                                         struct nft_set *set,
10599                                         const struct nft_set_iter *iter,
10600                                         struct nft_set_elem *elem)
10601 {
10602         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10603
10604         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10605             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10606                 return 0;
10607
10608         return nft_check_loops(ctx, ext);
10609 }
10610
10611 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10612                                   struct nft_set *set)
10613 {
10614         u8 genmask = nft_genmask_next(ctx->net);
10615         struct nft_set_elem_catchall *catchall;
10616         struct nft_set_ext *ext;
10617         int ret = 0;
10618
10619         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10620                 ext = nft_set_elem_ext(set, catchall->elem);
10621                 if (!nft_set_elem_active(ext, genmask))
10622                         continue;
10623
10624                 ret = nft_check_loops(ctx, ext);
10625                 if (ret < 0)
10626                         return ret;
10627         }
10628
10629         return ret;
10630 }
10631
10632 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10633                                  const struct nft_chain *chain)
10634 {
10635         const struct nft_rule *rule;
10636         const struct nft_expr *expr, *last;
10637         struct nft_set *set;
10638         struct nft_set_binding *binding;
10639         struct nft_set_iter iter;
10640
10641         if (ctx->chain == chain)
10642                 return -ELOOP;
10643
10644         if (fatal_signal_pending(current))
10645                 return -EINTR;
10646
10647         list_for_each_entry(rule, &chain->rules, list) {
10648                 nft_rule_for_each_expr(expr, last, rule) {
10649                         struct nft_immediate_expr *priv;
10650                         const struct nft_data *data;
10651                         int err;
10652
10653                         if (strcmp(expr->ops->type->name, "immediate"))
10654                                 continue;
10655
10656                         priv = nft_expr_priv(expr);
10657                         if (priv->dreg != NFT_REG_VERDICT)
10658                                 continue;
10659
10660                         data = &priv->data;
10661                         switch (data->verdict.code) {
10662                         case NFT_JUMP:
10663                         case NFT_GOTO:
10664                                 err = nf_tables_check_loops(ctx,
10665                                                         data->verdict.chain);
10666                                 if (err < 0)
10667                                         return err;
10668                                 break;
10669                         default:
10670                                 break;
10671                         }
10672                 }
10673         }
10674
10675         list_for_each_entry(set, &ctx->table->sets, list) {
10676                 if (!nft_is_active_next(ctx->net, set))
10677                         continue;
10678                 if (!(set->flags & NFT_SET_MAP) ||
10679                     set->dtype != NFT_DATA_VERDICT)
10680                         continue;
10681
10682                 list_for_each_entry(binding, &set->bindings, list) {
10683                         if (!(binding->flags & NFT_SET_MAP) ||
10684                             binding->chain != chain)
10685                                 continue;
10686
10687                         iter.genmask    = nft_genmask_next(ctx->net);
10688                         iter.skip       = 0;
10689                         iter.count      = 0;
10690                         iter.err        = 0;
10691                         iter.fn         = nf_tables_loop_check_setelem;
10692
10693                         set->ops->walk(ctx, set, &iter);
10694                         if (!iter.err)
10695                                 iter.err = nft_set_catchall_loops(ctx, set);
10696
10697                         if (iter.err < 0)
10698                                 return iter.err;
10699                 }
10700         }
10701
10702         return 0;
10703 }
10704
10705 /**
10706  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
10707  *
10708  *      @attr: netlink attribute to fetch value from
10709  *      @max: maximum value to be stored in dest
10710  *      @dest: pointer to the variable
10711  *
10712  *      Parse, check and store a given u32 netlink attribute into variable.
10713  *      This function returns -ERANGE if the value goes over maximum value.
10714  *      Otherwise a 0 is returned and the attribute value is stored in the
10715  *      destination variable.
10716  */
10717 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10718 {
10719         u32 val;
10720
10721         val = ntohl(nla_get_be32(attr));
10722         if (val > max)
10723                 return -ERANGE;
10724
10725         *dest = val;
10726         return 0;
10727 }
10728 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10729
10730 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10731 {
10732         unsigned int reg;
10733
10734         reg = ntohl(nla_get_be32(attr));
10735         switch (reg) {
10736         case NFT_REG_VERDICT...NFT_REG_4:
10737                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10738                 break;
10739         case NFT_REG32_00...NFT_REG32_15:
10740                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10741                 break;
10742         default:
10743                 return -ERANGE;
10744         }
10745
10746         return 0;
10747 }
10748
10749 /**
10750  *      nft_dump_register - dump a register value to a netlink attribute
10751  *
10752  *      @skb: socket buffer
10753  *      @attr: attribute number
10754  *      @reg: register number
10755  *
10756  *      Construct a netlink attribute containing the register number. For
10757  *      compatibility reasons, register numbers being a multiple of 4 are
10758  *      translated to the corresponding 128 bit register numbers.
10759  */
10760 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10761 {
10762         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10763                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10764         else
10765                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10766
10767         return nla_put_be32(skb, attr, htonl(reg));
10768 }
10769 EXPORT_SYMBOL_GPL(nft_dump_register);
10770
10771 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10772 {
10773         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10774                 return -EINVAL;
10775         if (len == 0)
10776                 return -EINVAL;
10777         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10778                 return -ERANGE;
10779
10780         return 0;
10781 }
10782
10783 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10784 {
10785         u32 reg;
10786         int err;
10787
10788         err = nft_parse_register(attr, &reg);
10789         if (err < 0)
10790                 return err;
10791
10792         err = nft_validate_register_load(reg, len);
10793         if (err < 0)
10794                 return err;
10795
10796         *sreg = reg;
10797         return 0;
10798 }
10799 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10800
10801 static int nft_validate_register_store(const struct nft_ctx *ctx,
10802                                        enum nft_registers reg,
10803                                        const struct nft_data *data,
10804                                        enum nft_data_types type,
10805                                        unsigned int len)
10806 {
10807         int err;
10808
10809         switch (reg) {
10810         case NFT_REG_VERDICT:
10811                 if (type != NFT_DATA_VERDICT)
10812                         return -EINVAL;
10813
10814                 if (data != NULL &&
10815                     (data->verdict.code == NFT_GOTO ||
10816                      data->verdict.code == NFT_JUMP)) {
10817                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10818                         if (err < 0)
10819                                 return err;
10820                 }
10821
10822                 return 0;
10823         default:
10824                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10825                         return -EINVAL;
10826                 if (len == 0)
10827                         return -EINVAL;
10828                 if (reg * NFT_REG32_SIZE + len >
10829                     sizeof_field(struct nft_regs, data))
10830                         return -ERANGE;
10831
10832                 if (data != NULL && type != NFT_DATA_VALUE)
10833                         return -EINVAL;
10834                 return 0;
10835         }
10836 }
10837
10838 int nft_parse_register_store(const struct nft_ctx *ctx,
10839                              const struct nlattr *attr, u8 *dreg,
10840                              const struct nft_data *data,
10841                              enum nft_data_types type, unsigned int len)
10842 {
10843         int err;
10844         u32 reg;
10845
10846         err = nft_parse_register(attr, &reg);
10847         if (err < 0)
10848                 return err;
10849
10850         err = nft_validate_register_store(ctx, reg, data, type, len);
10851         if (err < 0)
10852                 return err;
10853
10854         *dreg = reg;
10855         return 0;
10856 }
10857 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10858
10859 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10860         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10861         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10862                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10863         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10864 };
10865
10866 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10867                             struct nft_data_desc *desc, const struct nlattr *nla)
10868 {
10869         u8 genmask = nft_genmask_next(ctx->net);
10870         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10871         struct nft_chain *chain;
10872         int err;
10873
10874         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10875                                           nft_verdict_policy, NULL);
10876         if (err < 0)
10877                 return err;
10878
10879         if (!tb[NFTA_VERDICT_CODE])
10880                 return -EINVAL;
10881
10882         /* zero padding hole for memcmp */
10883         memset(data, 0, sizeof(*data));
10884         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10885
10886         switch (data->verdict.code) {
10887         default:
10888                 switch (data->verdict.code & NF_VERDICT_MASK) {
10889                 case NF_ACCEPT:
10890                 case NF_DROP:
10891                 case NF_QUEUE:
10892                         break;
10893                 default:
10894                         return -EINVAL;
10895                 }
10896                 fallthrough;
10897         case NFT_CONTINUE:
10898         case NFT_BREAK:
10899         case NFT_RETURN:
10900                 break;
10901         case NFT_JUMP:
10902         case NFT_GOTO:
10903                 if (tb[NFTA_VERDICT_CHAIN]) {
10904                         chain = nft_chain_lookup(ctx->net, ctx->table,
10905                                                  tb[NFTA_VERDICT_CHAIN],
10906                                                  genmask);
10907                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10908                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10909                                                       tb[NFTA_VERDICT_CHAIN_ID],
10910                                                       genmask);
10911                         if (IS_ERR(chain))
10912                                 return PTR_ERR(chain);
10913                 } else {
10914                         return -EINVAL;
10915                 }
10916
10917                 if (IS_ERR(chain))
10918                         return PTR_ERR(chain);
10919                 if (nft_is_base_chain(chain))
10920                         return -EOPNOTSUPP;
10921                 if (nft_chain_is_bound(chain))
10922                         return -EINVAL;
10923                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10924                     chain->flags & NFT_CHAIN_BINDING)
10925                         return -EINVAL;
10926                 if (!nft_use_inc(&chain->use))
10927                         return -EMFILE;
10928
10929                 data->verdict.chain = chain;
10930                 break;
10931         }
10932
10933         desc->len = sizeof(data->verdict);
10934
10935         return 0;
10936 }
10937
10938 static void nft_verdict_uninit(const struct nft_data *data)
10939 {
10940         struct nft_chain *chain;
10941
10942         switch (data->verdict.code) {
10943         case NFT_JUMP:
10944         case NFT_GOTO:
10945                 chain = data->verdict.chain;
10946                 nft_use_dec(&chain->use);
10947                 break;
10948         }
10949 }
10950
10951 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10952 {
10953         struct nlattr *nest;
10954
10955         nest = nla_nest_start_noflag(skb, type);
10956         if (!nest)
10957                 goto nla_put_failure;
10958
10959         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10960                 goto nla_put_failure;
10961
10962         switch (v->code) {
10963         case NFT_JUMP:
10964         case NFT_GOTO:
10965                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10966                                    v->chain->name))
10967                         goto nla_put_failure;
10968         }
10969         nla_nest_end(skb, nest);
10970         return 0;
10971
10972 nla_put_failure:
10973         return -1;
10974 }
10975
10976 static int nft_value_init(const struct nft_ctx *ctx,
10977                           struct nft_data *data, struct nft_data_desc *desc,
10978                           const struct nlattr *nla)
10979 {
10980         unsigned int len;
10981
10982         len = nla_len(nla);
10983         if (len == 0)
10984                 return -EINVAL;
10985         if (len > desc->size)
10986                 return -EOVERFLOW;
10987         if (desc->len) {
10988                 if (len != desc->len)
10989                         return -EINVAL;
10990         } else {
10991                 desc->len = len;
10992         }
10993
10994         nla_memcpy(data->data, nla, len);
10995
10996         return 0;
10997 }
10998
10999 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
11000                           unsigned int len)
11001 {
11002         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
11003 }
11004
11005 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
11006         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
11007         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
11008 };
11009
11010 /**
11011  *      nft_data_init - parse nf_tables data netlink attributes
11012  *
11013  *      @ctx: context of the expression using the data
11014  *      @data: destination struct nft_data
11015  *      @desc: data description
11016  *      @nla: netlink attribute containing data
11017  *
11018  *      Parse the netlink data attributes and initialize a struct nft_data.
11019  *      The type and length of data are returned in the data description.
11020  *
11021  *      The caller can indicate that it only wants to accept data of type
11022  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
11023  */
11024 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11025                   struct nft_data_desc *desc, const struct nlattr *nla)
11026 {
11027         struct nlattr *tb[NFTA_DATA_MAX + 1];
11028         int err;
11029
11030         if (WARN_ON_ONCE(!desc->size))
11031                 return -EINVAL;
11032
11033         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11034                                           nft_data_policy, NULL);
11035         if (err < 0)
11036                 return err;
11037
11038         if (tb[NFTA_DATA_VALUE]) {
11039                 if (desc->type != NFT_DATA_VALUE)
11040                         return -EINVAL;
11041
11042                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11043         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11044                 if (desc->type != NFT_DATA_VERDICT)
11045                         return -EINVAL;
11046
11047                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11048         } else {
11049                 err = -EINVAL;
11050         }
11051
11052         return err;
11053 }
11054 EXPORT_SYMBOL_GPL(nft_data_init);
11055
11056 /**
11057  *      nft_data_release - release a nft_data item
11058  *
11059  *      @data: struct nft_data to release
11060  *      @type: type of data
11061  *
11062  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11063  *      all others need to be released by calling this function.
11064  */
11065 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11066 {
11067         if (type < NFT_DATA_VERDICT)
11068                 return;
11069         switch (type) {
11070         case NFT_DATA_VERDICT:
11071                 return nft_verdict_uninit(data);
11072         default:
11073                 WARN_ON(1);
11074         }
11075 }
11076 EXPORT_SYMBOL_GPL(nft_data_release);
11077
11078 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11079                   enum nft_data_types type, unsigned int len)
11080 {
11081         struct nlattr *nest;
11082         int err;
11083
11084         nest = nla_nest_start_noflag(skb, attr);
11085         if (nest == NULL)
11086                 return -1;
11087
11088         switch (type) {
11089         case NFT_DATA_VALUE:
11090                 err = nft_value_dump(skb, data, len);
11091                 break;
11092         case NFT_DATA_VERDICT:
11093                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11094                 break;
11095         default:
11096                 err = -EINVAL;
11097                 WARN_ON(1);
11098         }
11099
11100         nla_nest_end(skb, nest);
11101         return err;
11102 }
11103 EXPORT_SYMBOL_GPL(nft_data_dump);
11104
11105 int __nft_release_basechain(struct nft_ctx *ctx)
11106 {
11107         struct nft_rule *rule, *nr;
11108
11109         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11110                 return 0;
11111
11112         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11113         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11114                 list_del(&rule->list);
11115                 nft_use_dec(&ctx->chain->use);
11116                 nf_tables_rule_release(ctx, rule);
11117         }
11118         nft_chain_del(ctx->chain);
11119         nft_use_dec(&ctx->table->use);
11120         nf_tables_chain_destroy(ctx);
11121
11122         return 0;
11123 }
11124 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11125
11126 static void __nft_release_hook(struct net *net, struct nft_table *table)
11127 {
11128         struct nft_flowtable *flowtable;
11129         struct nft_chain *chain;
11130
11131         list_for_each_entry(chain, &table->chains, list)
11132                 __nf_tables_unregister_hook(net, table, chain, true);
11133         list_for_each_entry(flowtable, &table->flowtables, list)
11134                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11135                                                      true);
11136 }
11137
11138 static void __nft_release_hooks(struct net *net)
11139 {
11140         struct nftables_pernet *nft_net = nft_pernet(net);
11141         struct nft_table *table;
11142
11143         list_for_each_entry(table, &nft_net->tables, list) {
11144                 if (nft_table_has_owner(table))
11145                         continue;
11146
11147                 __nft_release_hook(net, table);
11148         }
11149 }
11150
11151 static void __nft_release_table(struct net *net, struct nft_table *table)
11152 {
11153         struct nft_flowtable *flowtable, *nf;
11154         struct nft_chain *chain, *nc;
11155         struct nft_object *obj, *ne;
11156         struct nft_rule *rule, *nr;
11157         struct nft_set *set, *ns;
11158         struct nft_ctx ctx = {
11159                 .net    = net,
11160                 .family = NFPROTO_NETDEV,
11161         };
11162
11163         ctx.family = table->family;
11164         ctx.table = table;
11165         list_for_each_entry(chain, &table->chains, list) {
11166                 if (nft_chain_binding(chain))
11167                         continue;
11168
11169                 ctx.chain = chain;
11170                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11171                         list_del(&rule->list);
11172                         nft_use_dec(&chain->use);
11173                         nf_tables_rule_release(&ctx, rule);
11174                 }
11175         }
11176         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11177                 list_del(&flowtable->list);
11178                 nft_use_dec(&table->use);
11179                 nf_tables_flowtable_destroy(flowtable);
11180         }
11181         list_for_each_entry_safe(set, ns, &table->sets, list) {
11182                 list_del(&set->list);
11183                 nft_use_dec(&table->use);
11184                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11185                         nft_map_deactivate(&ctx, set);
11186
11187                 nft_set_destroy(&ctx, set);
11188         }
11189         list_for_each_entry_safe(obj, ne, &table->objects, list) {
11190                 nft_obj_del(obj);
11191                 nft_use_dec(&table->use);
11192                 nft_obj_destroy(&ctx, obj);
11193         }
11194         list_for_each_entry_safe(chain, nc, &table->chains, list) {
11195                 ctx.chain = chain;
11196                 nft_chain_del(chain);
11197                 nft_use_dec(&table->use);
11198                 nf_tables_chain_destroy(&ctx);
11199         }
11200         nf_tables_table_destroy(&ctx);
11201 }
11202
11203 static void __nft_release_tables(struct net *net)
11204 {
11205         struct nftables_pernet *nft_net = nft_pernet(net);
11206         struct nft_table *table, *nt;
11207
11208         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11209                 if (nft_table_has_owner(table))
11210                         continue;
11211
11212                 list_del(&table->list);
11213
11214                 __nft_release_table(net, table);
11215         }
11216 }
11217
11218 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11219                             void *ptr)
11220 {
11221         struct nft_table *table, *to_delete[8];
11222         struct nftables_pernet *nft_net;
11223         struct netlink_notify *n = ptr;
11224         struct net *net = n->net;
11225         unsigned int deleted;
11226         bool restart = false;
11227         unsigned int gc_seq;
11228
11229         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11230                 return NOTIFY_DONE;
11231
11232         nft_net = nft_pernet(net);
11233         deleted = 0;
11234         mutex_lock(&nft_net->commit_mutex);
11235
11236         gc_seq = nft_gc_seq_begin(nft_net);
11237
11238         if (!list_empty(&nf_tables_destroy_list))
11239                 nf_tables_trans_destroy_flush_work();
11240 again:
11241         list_for_each_entry(table, &nft_net->tables, list) {
11242                 if (nft_table_has_owner(table) &&
11243                     n->portid == table->nlpid) {
11244                         __nft_release_hook(net, table);
11245                         list_del_rcu(&table->list);
11246                         to_delete[deleted++] = table;
11247                         if (deleted >= ARRAY_SIZE(to_delete))
11248                                 break;
11249                 }
11250         }
11251         if (deleted) {
11252                 restart = deleted >= ARRAY_SIZE(to_delete);
11253                 synchronize_rcu();
11254                 while (deleted)
11255                         __nft_release_table(net, to_delete[--deleted]);
11256
11257                 if (restart)
11258                         goto again;
11259         }
11260         nft_gc_seq_end(nft_net, gc_seq);
11261
11262         mutex_unlock(&nft_net->commit_mutex);
11263
11264         return NOTIFY_DONE;
11265 }
11266
11267 static struct notifier_block nft_nl_notifier = {
11268         .notifier_call  = nft_rcv_nl_event,
11269 };
11270
11271 static int __net_init nf_tables_init_net(struct net *net)
11272 {
11273         struct nftables_pernet *nft_net = nft_pernet(net);
11274
11275         INIT_LIST_HEAD(&nft_net->tables);
11276         INIT_LIST_HEAD(&nft_net->commit_list);
11277         INIT_LIST_HEAD(&nft_net->binding_list);
11278         INIT_LIST_HEAD(&nft_net->module_list);
11279         INIT_LIST_HEAD(&nft_net->notify_list);
11280         mutex_init(&nft_net->commit_mutex);
11281         nft_net->base_seq = 1;
11282         nft_net->gc_seq = 0;
11283         nft_net->validate_state = NFT_VALIDATE_SKIP;
11284
11285         return 0;
11286 }
11287
11288 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11289 {
11290         struct nftables_pernet *nft_net = nft_pernet(net);
11291
11292         mutex_lock(&nft_net->commit_mutex);
11293         __nft_release_hooks(net);
11294         mutex_unlock(&nft_net->commit_mutex);
11295 }
11296
11297 static void __net_exit nf_tables_exit_net(struct net *net)
11298 {
11299         struct nftables_pernet *nft_net = nft_pernet(net);
11300         unsigned int gc_seq;
11301
11302         mutex_lock(&nft_net->commit_mutex);
11303
11304         gc_seq = nft_gc_seq_begin(nft_net);
11305
11306         if (!list_empty(&nft_net->commit_list) ||
11307             !list_empty(&nft_net->module_list))
11308                 __nf_tables_abort(net, NFNL_ABORT_NONE);
11309
11310         __nft_release_tables(net);
11311
11312         nft_gc_seq_end(nft_net, gc_seq);
11313
11314         mutex_unlock(&nft_net->commit_mutex);
11315         WARN_ON_ONCE(!list_empty(&nft_net->tables));
11316         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11317         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11318 }
11319
11320 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11321 {
11322         flush_work(&trans_gc_work);
11323 }
11324
11325 static struct pernet_operations nf_tables_net_ops = {
11326         .init           = nf_tables_init_net,
11327         .pre_exit       = nf_tables_pre_exit_net,
11328         .exit           = nf_tables_exit_net,
11329         .exit_batch     = nf_tables_exit_batch,
11330         .id             = &nf_tables_net_id,
11331         .size           = sizeof(struct nftables_pernet),
11332 };
11333
11334 static int __init nf_tables_module_init(void)
11335 {
11336         int err;
11337
11338         err = register_pernet_subsys(&nf_tables_net_ops);
11339         if (err < 0)
11340                 return err;
11341
11342         err = nft_chain_filter_init();
11343         if (err < 0)
11344                 goto err_chain_filter;
11345
11346         err = nf_tables_core_module_init();
11347         if (err < 0)
11348                 goto err_core_module;
11349
11350         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11351         if (err < 0)
11352                 goto err_netdev_notifier;
11353
11354         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11355         if (err < 0)
11356                 goto err_rht_objname;
11357
11358         err = nft_offload_init();
11359         if (err < 0)
11360                 goto err_offload;
11361
11362         err = netlink_register_notifier(&nft_nl_notifier);
11363         if (err < 0)
11364                 goto err_netlink_notifier;
11365
11366         /* must be last */
11367         err = nfnetlink_subsys_register(&nf_tables_subsys);
11368         if (err < 0)
11369                 goto err_nfnl_subsys;
11370
11371         nft_chain_route_init();
11372
11373         return err;
11374
11375 err_nfnl_subsys:
11376         netlink_unregister_notifier(&nft_nl_notifier);
11377 err_netlink_notifier:
11378         nft_offload_exit();
11379 err_offload:
11380         rhltable_destroy(&nft_objname_ht);
11381 err_rht_objname:
11382         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11383 err_netdev_notifier:
11384         nf_tables_core_module_exit();
11385 err_core_module:
11386         nft_chain_filter_fini();
11387 err_chain_filter:
11388         unregister_pernet_subsys(&nf_tables_net_ops);
11389         return err;
11390 }
11391
11392 static void __exit nf_tables_module_exit(void)
11393 {
11394         nfnetlink_subsys_unregister(&nf_tables_subsys);
11395         netlink_unregister_notifier(&nft_nl_notifier);
11396         nft_offload_exit();
11397         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11398         nft_chain_filter_fini();
11399         nft_chain_route_fini();
11400         unregister_pernet_subsys(&nf_tables_net_ops);
11401         cancel_work_sync(&trans_gc_work);
11402         cancel_work_sync(&trans_destroy_work);
11403         rcu_barrier();
11404         rhltable_destroy(&nft_objname_ht);
11405         nf_tables_core_module_exit();
11406 }
11407
11408 module_init(nf_tables_module_init);
11409 module_exit(nf_tables_module_exit);
11410
11411 MODULE_LICENSE("GPL");
11412 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11413 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);