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])
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] = { .type = NLA_NESTED },
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         char *table;
3445         char *chain;
3446 };
3447
3448 static int __nf_tables_dump_rules(struct sk_buff *skb,
3449                                   unsigned int *idx,
3450                                   struct netlink_callback *cb,
3451                                   const struct nft_table *table,
3452                                   const struct nft_chain *chain,
3453                                   bool reset)
3454 {
3455         struct net *net = sock_net(skb->sk);
3456         const struct nft_rule *rule, *prule;
3457         unsigned int s_idx = cb->args[0];
3458         unsigned int entries = 0;
3459         int ret = 0;
3460         u64 handle;
3461
3462         prule = NULL;
3463         list_for_each_entry_rcu(rule, &chain->rules, list) {
3464                 if (!nft_is_active(net, rule))
3465                         goto cont_skip;
3466                 if (*idx < s_idx)
3467                         goto cont;
3468                 if (*idx > s_idx) {
3469                         memset(&cb->args[1], 0,
3470                                         sizeof(cb->args) - sizeof(cb->args[0]));
3471                 }
3472                 if (prule)
3473                         handle = prule->handle;
3474                 else
3475                         handle = 0;
3476
3477                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3478                                         cb->nlh->nlmsg_seq,
3479                                         NFT_MSG_NEWRULE,
3480                                         NLM_F_MULTI | NLM_F_APPEND,
3481                                         table->family,
3482                                         table, chain, rule, handle, reset) < 0) {
3483                         ret = 1;
3484                         break;
3485                 }
3486                 entries++;
3487                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3488 cont:
3489                 prule = rule;
3490 cont_skip:
3491                 (*idx)++;
3492         }
3493
3494         if (reset && entries)
3495                 audit_log_rule_reset(table, cb->seq, entries);
3496
3497         return ret;
3498 }
3499
3500 static int nf_tables_dump_rules(struct sk_buff *skb,
3501                                 struct netlink_callback *cb)
3502 {
3503         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3504         const struct nft_rule_dump_ctx *ctx = cb->data;
3505         struct nft_table *table;
3506         const struct nft_chain *chain;
3507         unsigned int idx = 0;
3508         struct net *net = sock_net(skb->sk);
3509         int family = nfmsg->nfgen_family;
3510         struct nftables_pernet *nft_net;
3511         bool reset = false;
3512
3513         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3514                 reset = true;
3515
3516         rcu_read_lock();
3517         nft_net = nft_pernet(net);
3518         cb->seq = READ_ONCE(nft_net->base_seq);
3519
3520         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3521                 if (family != NFPROTO_UNSPEC && family != table->family)
3522                         continue;
3523
3524                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3525                         continue;
3526
3527                 if (ctx && ctx->table && ctx->chain) {
3528                         struct rhlist_head *list, *tmp;
3529
3530                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3531                                                nft_chain_ht_params);
3532                         if (!list)
3533                                 goto done;
3534
3535                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3536                                 if (!nft_is_active(net, chain))
3537                                         continue;
3538                                 __nf_tables_dump_rules(skb, &idx,
3539                                                        cb, table, chain, reset);
3540                                 break;
3541                         }
3542                         goto done;
3543                 }
3544
3545                 list_for_each_entry_rcu(chain, &table->chains, list) {
3546                         if (__nf_tables_dump_rules(skb, &idx,
3547                                                    cb, table, chain, reset))
3548                                 goto done;
3549                 }
3550
3551                 if (ctx && ctx->table)
3552                         break;
3553         }
3554 done:
3555         rcu_read_unlock();
3556
3557         cb->args[0] = idx;
3558         return skb->len;
3559 }
3560
3561 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3562 {
3563         const struct nlattr * const *nla = cb->data;
3564         struct nft_rule_dump_ctx *ctx = NULL;
3565
3566         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3567                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3568                 if (!ctx)
3569                         return -ENOMEM;
3570
3571                 if (nla[NFTA_RULE_TABLE]) {
3572                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3573                                                         GFP_ATOMIC);
3574                         if (!ctx->table) {
3575                                 kfree(ctx);
3576                                 return -ENOMEM;
3577                         }
3578                 }
3579                 if (nla[NFTA_RULE_CHAIN]) {
3580                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3581                                                 GFP_ATOMIC);
3582                         if (!ctx->chain) {
3583                                 kfree(ctx->table);
3584                                 kfree(ctx);
3585                                 return -ENOMEM;
3586                         }
3587                 }
3588         }
3589
3590         cb->data = ctx;
3591         return 0;
3592 }
3593
3594 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3595 {
3596         struct nft_rule_dump_ctx *ctx = cb->data;
3597
3598         if (ctx) {
3599                 kfree(ctx->table);
3600                 kfree(ctx->chain);
3601                 kfree(ctx);
3602         }
3603         return 0;
3604 }
3605
3606 /* called with rcu_read_lock held */
3607 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3608                              const struct nlattr * const nla[])
3609 {
3610         struct netlink_ext_ack *extack = info->extack;
3611         u8 genmask = nft_genmask_cur(info->net);
3612         u8 family = info->nfmsg->nfgen_family;
3613         const struct nft_chain *chain;
3614         const struct nft_rule *rule;
3615         struct net *net = info->net;
3616         struct nft_table *table;
3617         struct sk_buff *skb2;
3618         bool reset = false;
3619         int err;
3620
3621         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3622                 struct netlink_dump_control c = {
3623                         .start= nf_tables_dump_rules_start,
3624                         .dump = nf_tables_dump_rules,
3625                         .done = nf_tables_dump_rules_done,
3626                         .module = THIS_MODULE,
3627                         .data = (void *)nla,
3628                 };
3629
3630                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3631         }
3632
3633         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3634         if (IS_ERR(table)) {
3635                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3636                 return PTR_ERR(table);
3637         }
3638
3639         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3640         if (IS_ERR(chain)) {
3641                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3642                 return PTR_ERR(chain);
3643         }
3644
3645         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3646         if (IS_ERR(rule)) {
3647                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3648                 return PTR_ERR(rule);
3649         }
3650
3651         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3652         if (!skb2)
3653                 return -ENOMEM;
3654
3655         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3656                 reset = true;
3657
3658         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3659                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3660                                        family, table, chain, rule, 0, reset);
3661         if (err < 0)
3662                 goto err_fill_rule_info;
3663
3664         if (reset)
3665                 audit_log_rule_reset(table, nft_pernet(net)->base_seq, 1);
3666
3667         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3668
3669 err_fill_rule_info:
3670         kfree_skb(skb2);
3671         return err;
3672 }
3673
3674 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3675 {
3676         struct nft_expr *expr, *next;
3677
3678         /*
3679          * Careful: some expressions might not be initialized in case this
3680          * is called on error from nf_tables_newrule().
3681          */
3682         expr = nft_expr_first(rule);
3683         while (nft_expr_more(rule, expr)) {
3684                 next = nft_expr_next(expr);
3685                 nf_tables_expr_destroy(ctx, expr);
3686                 expr = next;
3687         }
3688         kfree(rule);
3689 }
3690
3691 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3692 {
3693         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3694         nf_tables_rule_destroy(ctx, rule);
3695 }
3696
3697 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3698 {
3699         struct nft_expr *expr, *last;
3700         const struct nft_data *data;
3701         struct nft_rule *rule;
3702         int err;
3703
3704         if (ctx->level == NFT_JUMP_STACK_SIZE)
3705                 return -EMLINK;
3706
3707         list_for_each_entry(rule, &chain->rules, list) {
3708                 if (fatal_signal_pending(current))
3709                         return -EINTR;
3710
3711                 if (!nft_is_active_next(ctx->net, rule))
3712                         continue;
3713
3714                 nft_rule_for_each_expr(expr, last, rule) {
3715                         if (!expr->ops->validate)
3716                                 continue;
3717
3718                         err = expr->ops->validate(ctx, expr, &data);
3719                         if (err < 0)
3720                                 return err;
3721                 }
3722         }
3723
3724         return 0;
3725 }
3726 EXPORT_SYMBOL_GPL(nft_chain_validate);
3727
3728 static int nft_table_validate(struct net *net, const struct nft_table *table)
3729 {
3730         struct nft_chain *chain;
3731         struct nft_ctx ctx = {
3732                 .net    = net,
3733                 .family = table->family,
3734         };
3735         int err;
3736
3737         list_for_each_entry(chain, &table->chains, list) {
3738                 if (!nft_is_base_chain(chain))
3739                         continue;
3740
3741                 ctx.chain = chain;
3742                 err = nft_chain_validate(&ctx, chain);
3743                 if (err < 0)
3744                         return err;
3745
3746                 cond_resched();
3747         }
3748
3749         return 0;
3750 }
3751
3752 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3753                          const struct nft_set_iter *iter,
3754                          struct nft_set_elem *elem)
3755 {
3756         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3757         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3758         const struct nft_data *data;
3759         int err;
3760
3761         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3762             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3763                 return 0;
3764
3765         data = nft_set_ext_data(ext);
3766         switch (data->verdict.code) {
3767         case NFT_JUMP:
3768         case NFT_GOTO:
3769                 pctx->level++;
3770                 err = nft_chain_validate(ctx, data->verdict.chain);
3771                 if (err < 0)
3772                         return err;
3773                 pctx->level--;
3774                 break;
3775         default:
3776                 break;
3777         }
3778
3779         return 0;
3780 }
3781
3782 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3783 {
3784         u8 genmask = nft_genmask_next(ctx->net);
3785         struct nft_set_elem_catchall *catchall;
3786         struct nft_set_elem elem;
3787         struct nft_set_ext *ext;
3788         int ret = 0;
3789
3790         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3791                 ext = nft_set_elem_ext(set, catchall->elem);
3792                 if (!nft_set_elem_active(ext, genmask))
3793                         continue;
3794
3795                 elem.priv = catchall->elem;
3796                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3797                 if (ret < 0)
3798                         return ret;
3799         }
3800
3801         return ret;
3802 }
3803
3804 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3805                                              const struct nft_chain *chain,
3806                                              const struct nlattr *nla);
3807
3808 #define NFT_RULE_MAXEXPRS       128
3809
3810 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3811                              const struct nlattr * const nla[])
3812 {
3813         struct nftables_pernet *nft_net = nft_pernet(info->net);
3814         struct netlink_ext_ack *extack = info->extack;
3815         unsigned int size, i, n, ulen = 0, usize = 0;
3816         u8 genmask = nft_genmask_next(info->net);
3817         struct nft_rule *rule, *old_rule = NULL;
3818         struct nft_expr_info *expr_info = NULL;
3819         u8 family = info->nfmsg->nfgen_family;
3820         struct nft_flow_rule *flow = NULL;
3821         struct net *net = info->net;
3822         struct nft_userdata *udata;
3823         struct nft_table *table;
3824         struct nft_chain *chain;
3825         struct nft_trans *trans;
3826         u64 handle, pos_handle;
3827         struct nft_expr *expr;
3828         struct nft_ctx ctx;
3829         struct nlattr *tmp;
3830         int err, rem;
3831
3832         lockdep_assert_held(&nft_net->commit_mutex);
3833
3834         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3835                                  NETLINK_CB(skb).portid);
3836         if (IS_ERR(table)) {
3837                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3838                 return PTR_ERR(table);
3839         }
3840
3841         if (nla[NFTA_RULE_CHAIN]) {
3842                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3843                                          genmask);
3844                 if (IS_ERR(chain)) {
3845                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3846                         return PTR_ERR(chain);
3847                 }
3848
3849         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3850                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3851                                               genmask);
3852                 if (IS_ERR(chain)) {
3853                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3854                         return PTR_ERR(chain);
3855                 }
3856         } else {
3857                 return -EINVAL;
3858         }
3859
3860         if (nft_chain_is_bound(chain))
3861                 return -EOPNOTSUPP;
3862
3863         if (nla[NFTA_RULE_HANDLE]) {
3864                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3865                 rule = __nft_rule_lookup(chain, handle);
3866                 if (IS_ERR(rule)) {
3867                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3868                         return PTR_ERR(rule);
3869                 }
3870
3871                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3872                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3873                         return -EEXIST;
3874                 }
3875                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3876                         old_rule = rule;
3877                 else
3878                         return -EOPNOTSUPP;
3879         } else {
3880                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3881                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3882                         return -EINVAL;
3883                 handle = nf_tables_alloc_handle(table);
3884
3885                 if (nla[NFTA_RULE_POSITION]) {
3886                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3887                         old_rule = __nft_rule_lookup(chain, pos_handle);
3888                         if (IS_ERR(old_rule)) {
3889                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3890                                 return PTR_ERR(old_rule);
3891                         }
3892                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3893                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3894                         if (IS_ERR(old_rule)) {
3895                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3896                                 return PTR_ERR(old_rule);
3897                         }
3898                 }
3899         }
3900
3901         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3902
3903         n = 0;
3904         size = 0;
3905         if (nla[NFTA_RULE_EXPRESSIONS]) {
3906                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3907                                            sizeof(struct nft_expr_info),
3908                                            GFP_KERNEL);
3909                 if (!expr_info)
3910                         return -ENOMEM;
3911
3912                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3913                         err = -EINVAL;
3914                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3915                                 goto err_release_expr;
3916                         if (n == NFT_RULE_MAXEXPRS)
3917                                 goto err_release_expr;
3918                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3919                         if (err < 0) {
3920                                 NL_SET_BAD_ATTR(extack, tmp);
3921                                 goto err_release_expr;
3922                         }
3923                         size += expr_info[n].ops->size;
3924                         n++;
3925                 }
3926         }
3927         /* Check for overflow of dlen field */
3928         err = -EFBIG;
3929         if (size >= 1 << 12)
3930                 goto err_release_expr;
3931
3932         if (nla[NFTA_RULE_USERDATA]) {
3933                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3934                 if (ulen > 0)
3935                         usize = sizeof(struct nft_userdata) + ulen;
3936         }
3937
3938         err = -ENOMEM;
3939         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3940         if (rule == NULL)
3941                 goto err_release_expr;
3942
3943         nft_activate_next(net, rule);
3944
3945         rule->handle = handle;
3946         rule->dlen   = size;
3947         rule->udata  = ulen ? 1 : 0;
3948
3949         if (ulen) {
3950                 udata = nft_userdata(rule);
3951                 udata->len = ulen - 1;
3952                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3953         }
3954
3955         expr = nft_expr_first(rule);
3956         for (i = 0; i < n; i++) {
3957                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3958                 if (err < 0) {
3959                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3960                         goto err_release_rule;
3961                 }
3962
3963                 if (expr_info[i].ops->validate)
3964                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
3965
3966                 expr_info[i].ops = NULL;
3967                 expr = nft_expr_next(expr);
3968         }
3969
3970         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3971                 flow = nft_flow_rule_create(net, rule);
3972                 if (IS_ERR(flow)) {
3973                         err = PTR_ERR(flow);
3974                         goto err_release_rule;
3975                 }
3976         }
3977
3978         if (!nft_use_inc(&chain->use)) {
3979                 err = -EMFILE;
3980                 goto err_release_rule;
3981         }
3982
3983         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3984                 if (nft_chain_binding(chain)) {
3985                         err = -EOPNOTSUPP;
3986                         goto err_destroy_flow_rule;
3987                 }
3988
3989                 err = nft_delrule(&ctx, old_rule);
3990                 if (err < 0)
3991                         goto err_destroy_flow_rule;
3992
3993                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3994                 if (trans == NULL) {
3995                         err = -ENOMEM;
3996                         goto err_destroy_flow_rule;
3997                 }
3998                 list_add_tail_rcu(&rule->list, &old_rule->list);
3999         } else {
4000                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4001                 if (!trans) {
4002                         err = -ENOMEM;
4003                         goto err_destroy_flow_rule;
4004                 }
4005
4006                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4007                         if (old_rule)
4008                                 list_add_rcu(&rule->list, &old_rule->list);
4009                         else
4010                                 list_add_tail_rcu(&rule->list, &chain->rules);
4011                  } else {
4012                         if (old_rule)
4013                                 list_add_tail_rcu(&rule->list, &old_rule->list);
4014                         else
4015                                 list_add_rcu(&rule->list, &chain->rules);
4016                 }
4017         }
4018         kvfree(expr_info);
4019
4020         if (flow)
4021                 nft_trans_flow_rule(trans) = flow;
4022
4023         if (table->validate_state == NFT_VALIDATE_DO)
4024                 return nft_table_validate(net, table);
4025
4026         return 0;
4027
4028 err_destroy_flow_rule:
4029         nft_use_dec_restore(&chain->use);
4030         if (flow)
4031                 nft_flow_rule_destroy(flow);
4032 err_release_rule:
4033         nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4034         nf_tables_rule_destroy(&ctx, rule);
4035 err_release_expr:
4036         for (i = 0; i < n; i++) {
4037                 if (expr_info[i].ops) {
4038                         module_put(expr_info[i].ops->type->owner);
4039                         if (expr_info[i].ops->type->release_ops)
4040                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4041                 }
4042         }
4043         kvfree(expr_info);
4044
4045         return err;
4046 }
4047
4048 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4049                                              const struct nft_chain *chain,
4050                                              const struct nlattr *nla)
4051 {
4052         struct nftables_pernet *nft_net = nft_pernet(net);
4053         u32 id = ntohl(nla_get_be32(nla));
4054         struct nft_trans *trans;
4055
4056         list_for_each_entry(trans, &nft_net->commit_list, list) {
4057                 if (trans->msg_type == NFT_MSG_NEWRULE &&
4058                     trans->ctx.chain == chain &&
4059                     id == nft_trans_rule_id(trans))
4060                         return nft_trans_rule(trans);
4061         }
4062         return ERR_PTR(-ENOENT);
4063 }
4064
4065 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4066                              const struct nlattr * const nla[])
4067 {
4068         struct netlink_ext_ack *extack = info->extack;
4069         u8 genmask = nft_genmask_next(info->net);
4070         u8 family = info->nfmsg->nfgen_family;
4071         struct nft_chain *chain = NULL;
4072         struct net *net = info->net;
4073         struct nft_table *table;
4074         struct nft_rule *rule;
4075         struct nft_ctx ctx;
4076         int err = 0;
4077
4078         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4079                                  NETLINK_CB(skb).portid);
4080         if (IS_ERR(table)) {
4081                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4082                 return PTR_ERR(table);
4083         }
4084
4085         if (nla[NFTA_RULE_CHAIN]) {
4086                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4087                                          genmask);
4088                 if (IS_ERR(chain)) {
4089                         if (PTR_ERR(chain) == -ENOENT &&
4090                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4091                                 return 0;
4092
4093                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4094                         return PTR_ERR(chain);
4095                 }
4096                 if (nft_chain_binding(chain))
4097                         return -EOPNOTSUPP;
4098         }
4099
4100         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4101
4102         if (chain) {
4103                 if (nla[NFTA_RULE_HANDLE]) {
4104                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4105                         if (IS_ERR(rule)) {
4106                                 if (PTR_ERR(rule) == -ENOENT &&
4107                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4108                                         return 0;
4109
4110                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4111                                 return PTR_ERR(rule);
4112                         }
4113
4114                         err = nft_delrule(&ctx, rule);
4115                 } else if (nla[NFTA_RULE_ID]) {
4116                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4117                         if (IS_ERR(rule)) {
4118                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4119                                 return PTR_ERR(rule);
4120                         }
4121
4122                         err = nft_delrule(&ctx, rule);
4123                 } else {
4124                         err = nft_delrule_by_chain(&ctx);
4125                 }
4126         } else {
4127                 list_for_each_entry(chain, &table->chains, list) {
4128                         if (!nft_is_active_next(net, chain))
4129                                 continue;
4130                         if (nft_chain_binding(chain))
4131                                 continue;
4132
4133                         ctx.chain = chain;
4134                         err = nft_delrule_by_chain(&ctx);
4135                         if (err < 0)
4136                                 break;
4137                 }
4138         }
4139
4140         return err;
4141 }
4142
4143 /*
4144  * Sets
4145  */
4146 static const struct nft_set_type *nft_set_types[] = {
4147         &nft_set_hash_fast_type,
4148         &nft_set_hash_type,
4149         &nft_set_rhash_type,
4150         &nft_set_bitmap_type,
4151         &nft_set_rbtree_type,
4152 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4153         &nft_set_pipapo_avx2_type,
4154 #endif
4155         &nft_set_pipapo_type,
4156 };
4157
4158 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
4159                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4160                                  NFT_SET_EVAL)
4161
4162 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4163 {
4164         return (flags & type->features) == (flags & NFT_SET_FEATURES);
4165 }
4166
4167 /*
4168  * Select a set implementation based on the data characteristics and the
4169  * given policy. The total memory use might not be known if no size is
4170  * given, in that case the amount of memory per element is used.
4171  */
4172 static const struct nft_set_ops *
4173 nft_select_set_ops(const struct nft_ctx *ctx,
4174                    const struct nlattr * const nla[],
4175                    const struct nft_set_desc *desc)
4176 {
4177         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4178         const struct nft_set_ops *ops, *bops;
4179         struct nft_set_estimate est, best;
4180         const struct nft_set_type *type;
4181         u32 flags = 0;
4182         int i;
4183
4184         lockdep_assert_held(&nft_net->commit_mutex);
4185         lockdep_nfnl_nft_mutex_not_held();
4186
4187         if (nla[NFTA_SET_FLAGS] != NULL)
4188                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4189
4190         bops        = NULL;
4191         best.size   = ~0;
4192         best.lookup = ~0;
4193         best.space  = ~0;
4194
4195         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4196                 type = nft_set_types[i];
4197                 ops = &type->ops;
4198
4199                 if (!nft_set_ops_candidate(type, flags))
4200                         continue;
4201                 if (!ops->estimate(desc, flags, &est))
4202                         continue;
4203
4204                 switch (desc->policy) {
4205                 case NFT_SET_POL_PERFORMANCE:
4206                         if (est.lookup < best.lookup)
4207                                 break;
4208                         if (est.lookup == best.lookup &&
4209                             est.space < best.space)
4210                                 break;
4211                         continue;
4212                 case NFT_SET_POL_MEMORY:
4213                         if (!desc->size) {
4214                                 if (est.space < best.space)
4215                                         break;
4216                                 if (est.space == best.space &&
4217                                     est.lookup < best.lookup)
4218                                         break;
4219                         } else if (est.size < best.size || !bops) {
4220                                 break;
4221                         }
4222                         continue;
4223                 default:
4224                         break;
4225                 }
4226
4227                 bops = ops;
4228                 best = est;
4229         }
4230
4231         if (bops != NULL)
4232                 return bops;
4233
4234         return ERR_PTR(-EOPNOTSUPP);
4235 }
4236
4237 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4238         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4239                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4240         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4241                                             .len = NFT_SET_MAXNAMELEN - 1 },
4242         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4243         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4244         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4245         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4246         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4247         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4248         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4249         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4250         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4251         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4252         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4253                                             .len  = NFT_USERDATA_MAXLEN },
4254         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4255         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4256         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4257         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
4258 };
4259
4260 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4261         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4262         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
4263 };
4264
4265 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4266                                       const struct nlattr *nla, u8 genmask)
4267 {
4268         struct nft_set *set;
4269
4270         if (nla == NULL)
4271                 return ERR_PTR(-EINVAL);
4272
4273         list_for_each_entry_rcu(set, &table->sets, list) {
4274                 if (!nla_strcmp(nla, set->name) &&
4275                     nft_active_genmask(set, genmask))
4276                         return set;
4277         }
4278         return ERR_PTR(-ENOENT);
4279 }
4280
4281 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4282                                                const struct nlattr *nla,
4283                                                u8 genmask)
4284 {
4285         struct nft_set *set;
4286
4287         list_for_each_entry(set, &table->sets, list) {
4288                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4289                     nft_active_genmask(set, genmask))
4290                         return set;
4291         }
4292         return ERR_PTR(-ENOENT);
4293 }
4294
4295 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4296                                            const struct nft_table *table,
4297                                            const struct nlattr *nla, u8 genmask)
4298 {
4299         struct nftables_pernet *nft_net = nft_pernet(net);
4300         u32 id = ntohl(nla_get_be32(nla));
4301         struct nft_trans *trans;
4302
4303         list_for_each_entry(trans, &nft_net->commit_list, list) {
4304                 if (trans->msg_type == NFT_MSG_NEWSET) {
4305                         struct nft_set *set = nft_trans_set(trans);
4306
4307                         if (id == nft_trans_set_id(trans) &&
4308                             set->table == table &&
4309                             nft_active_genmask(set, genmask))
4310                                 return set;
4311                 }
4312         }
4313         return ERR_PTR(-ENOENT);
4314 }
4315
4316 struct nft_set *nft_set_lookup_global(const struct net *net,
4317                                       const struct nft_table *table,
4318                                       const struct nlattr *nla_set_name,
4319                                       const struct nlattr *nla_set_id,
4320                                       u8 genmask)
4321 {
4322         struct nft_set *set;
4323
4324         set = nft_set_lookup(table, nla_set_name, genmask);
4325         if (IS_ERR(set)) {
4326                 if (!nla_set_id)
4327                         return set;
4328
4329                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4330         }
4331         return set;
4332 }
4333 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4334
4335 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4336                                     const char *name)
4337 {
4338         const struct nft_set *i;
4339         const char *p;
4340         unsigned long *inuse;
4341         unsigned int n = 0, min = 0;
4342
4343         p = strchr(name, '%');
4344         if (p != NULL) {
4345                 if (p[1] != 'd' || strchr(p + 2, '%'))
4346                         return -EINVAL;
4347
4348                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4349                 if (inuse == NULL)
4350                         return -ENOMEM;
4351 cont:
4352                 list_for_each_entry(i, &ctx->table->sets, list) {
4353                         int tmp;
4354
4355                         if (!nft_is_active_next(ctx->net, i))
4356                                 continue;
4357                         if (!sscanf(i->name, name, &tmp))
4358                                 continue;
4359                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4360                                 continue;
4361
4362                         set_bit(tmp - min, inuse);
4363                 }
4364
4365                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4366                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4367                         min += BITS_PER_BYTE * PAGE_SIZE;
4368                         memset(inuse, 0, PAGE_SIZE);
4369                         goto cont;
4370                 }
4371                 free_page((unsigned long)inuse);
4372         }
4373
4374         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4375         if (!set->name)
4376                 return -ENOMEM;
4377
4378         list_for_each_entry(i, &ctx->table->sets, list) {
4379                 if (!nft_is_active_next(ctx->net, i))
4380                         continue;
4381                 if (!strcmp(set->name, i->name)) {
4382                         kfree(set->name);
4383                         set->name = NULL;
4384                         return -ENFILE;
4385                 }
4386         }
4387         return 0;
4388 }
4389
4390 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4391 {
4392         u64 ms = be64_to_cpu(nla_get_be64(nla));
4393         u64 max = (u64)(~((u64)0));
4394
4395         max = div_u64(max, NSEC_PER_MSEC);
4396         if (ms >= max)
4397                 return -ERANGE;
4398
4399         ms *= NSEC_PER_MSEC;
4400         *result = nsecs_to_jiffies64(ms);
4401         return 0;
4402 }
4403
4404 __be64 nf_jiffies64_to_msecs(u64 input)
4405 {
4406         return cpu_to_be64(jiffies64_to_msecs(input));
4407 }
4408
4409 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4410                                      const struct nft_set *set)
4411 {
4412         struct nlattr *concat, *field;
4413         int i;
4414
4415         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4416         if (!concat)
4417                 return -ENOMEM;
4418
4419         for (i = 0; i < set->field_count; i++) {
4420                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4421                 if (!field)
4422                         return -ENOMEM;
4423
4424                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4425                                  htonl(set->field_len[i])))
4426                         return -ENOMEM;
4427
4428                 nla_nest_end(skb, field);
4429         }
4430
4431         nla_nest_end(skb, concat);
4432
4433         return 0;
4434 }
4435
4436 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4437                               const struct nft_set *set, u16 event, u16 flags)
4438 {
4439         u64 timeout = READ_ONCE(set->timeout);
4440         u32 gc_int = READ_ONCE(set->gc_int);
4441         u32 portid = ctx->portid;
4442         struct nlmsghdr *nlh;
4443         struct nlattr *nest;
4444         u32 seq = ctx->seq;
4445         int i;
4446
4447         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4448         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4449                            NFNETLINK_V0, nft_base_seq(ctx->net));
4450         if (!nlh)
4451                 goto nla_put_failure;
4452
4453         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4454                 goto nla_put_failure;
4455         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4456                 goto nla_put_failure;
4457         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4458                          NFTA_SET_PAD))
4459                 goto nla_put_failure;
4460
4461         if (event == NFT_MSG_DELSET) {
4462                 nlmsg_end(skb, nlh);
4463                 return 0;
4464         }
4465
4466         if (set->flags != 0)
4467                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4468                         goto nla_put_failure;
4469
4470         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4471                 goto nla_put_failure;
4472         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4473                 goto nla_put_failure;
4474         if (set->flags & NFT_SET_MAP) {
4475                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4476                         goto nla_put_failure;
4477                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4478                         goto nla_put_failure;
4479         }
4480         if (set->flags & NFT_SET_OBJECT &&
4481             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4482                 goto nla_put_failure;
4483
4484         if (timeout &&
4485             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4486                          nf_jiffies64_to_msecs(timeout),
4487                          NFTA_SET_PAD))
4488                 goto nla_put_failure;
4489         if (gc_int &&
4490             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4491                 goto nla_put_failure;
4492
4493         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4494                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4495                         goto nla_put_failure;
4496         }
4497
4498         if (set->udata &&
4499             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4500                 goto nla_put_failure;
4501
4502         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4503         if (!nest)
4504                 goto nla_put_failure;
4505         if (set->size &&
4506             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4507                 goto nla_put_failure;
4508
4509         if (set->field_count > 1 &&
4510             nf_tables_fill_set_concat(skb, set))
4511                 goto nla_put_failure;
4512
4513         nla_nest_end(skb, nest);
4514
4515         if (set->num_exprs == 1) {
4516                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4517                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4518                         goto nla_put_failure;
4519
4520                 nla_nest_end(skb, nest);
4521         } else if (set->num_exprs > 1) {
4522                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4523                 if (nest == NULL)
4524                         goto nla_put_failure;
4525
4526                 for (i = 0; i < set->num_exprs; i++) {
4527                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4528                                           set->exprs[i], false) < 0)
4529                                 goto nla_put_failure;
4530                 }
4531                 nla_nest_end(skb, nest);
4532         }
4533
4534         nlmsg_end(skb, nlh);
4535         return 0;
4536
4537 nla_put_failure:
4538         nlmsg_trim(skb, nlh);
4539         return -1;
4540 }
4541
4542 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4543                                  const struct nft_set *set, int event,
4544                                  gfp_t gfp_flags)
4545 {
4546         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4547         u32 portid = ctx->portid;
4548         struct sk_buff *skb;
4549         u16 flags = 0;
4550         int err;
4551
4552         if (!ctx->report &&
4553             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4554                 return;
4555
4556         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4557         if (skb == NULL)
4558                 goto err;
4559
4560         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4561                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4562
4563         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4564         if (err < 0) {
4565                 kfree_skb(skb);
4566                 goto err;
4567         }
4568
4569         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4570         return;
4571 err:
4572         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4573 }
4574
4575 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4576 {
4577         const struct nft_set *set;
4578         unsigned int idx, s_idx = cb->args[0];
4579         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4580         struct net *net = sock_net(skb->sk);
4581         struct nft_ctx *ctx = cb->data, ctx_set;
4582         struct nftables_pernet *nft_net;
4583
4584         if (cb->args[1])
4585                 return skb->len;
4586
4587         rcu_read_lock();
4588         nft_net = nft_pernet(net);
4589         cb->seq = READ_ONCE(nft_net->base_seq);
4590
4591         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4592                 if (ctx->family != NFPROTO_UNSPEC &&
4593                     ctx->family != table->family)
4594                         continue;
4595
4596                 if (ctx->table && ctx->table != table)
4597                         continue;
4598
4599                 if (cur_table) {
4600                         if (cur_table != table)
4601                                 continue;
4602
4603                         cur_table = NULL;
4604                 }
4605                 idx = 0;
4606                 list_for_each_entry_rcu(set, &table->sets, list) {
4607                         if (idx < s_idx)
4608                                 goto cont;
4609                         if (!nft_is_active(net, set))
4610                                 goto cont;
4611
4612                         ctx_set = *ctx;
4613                         ctx_set.table = table;
4614                         ctx_set.family = table->family;
4615
4616                         if (nf_tables_fill_set(skb, &ctx_set, set,
4617                                                NFT_MSG_NEWSET,
4618                                                NLM_F_MULTI) < 0) {
4619                                 cb->args[0] = idx;
4620                                 cb->args[2] = (unsigned long) table;
4621                                 goto done;
4622                         }
4623                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4624 cont:
4625                         idx++;
4626                 }
4627                 if (s_idx)
4628                         s_idx = 0;
4629         }
4630         cb->args[1] = 1;
4631 done:
4632         rcu_read_unlock();
4633         return skb->len;
4634 }
4635
4636 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4637 {
4638         struct nft_ctx *ctx_dump = NULL;
4639
4640         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4641         if (ctx_dump == NULL)
4642                 return -ENOMEM;
4643
4644         cb->data = ctx_dump;
4645         return 0;
4646 }
4647
4648 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4649 {
4650         kfree(cb->data);
4651         return 0;
4652 }
4653
4654 /* called with rcu_read_lock held */
4655 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4656                             const struct nlattr * const nla[])
4657 {
4658         struct netlink_ext_ack *extack = info->extack;
4659         u8 genmask = nft_genmask_cur(info->net);
4660         u8 family = info->nfmsg->nfgen_family;
4661         struct nft_table *table = NULL;
4662         struct net *net = info->net;
4663         const struct nft_set *set;
4664         struct sk_buff *skb2;
4665         struct nft_ctx ctx;
4666         int err;
4667
4668         if (nla[NFTA_SET_TABLE]) {
4669                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4670                                          genmask, 0);
4671                 if (IS_ERR(table)) {
4672                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4673                         return PTR_ERR(table);
4674                 }
4675         }
4676
4677         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4678
4679         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4680                 struct netlink_dump_control c = {
4681                         .start = nf_tables_dump_sets_start,
4682                         .dump = nf_tables_dump_sets,
4683                         .done = nf_tables_dump_sets_done,
4684                         .data = &ctx,
4685                         .module = THIS_MODULE,
4686                 };
4687
4688                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4689         }
4690
4691         /* Only accept unspec with dump */
4692         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4693                 return -EAFNOSUPPORT;
4694         if (!nla[NFTA_SET_TABLE])
4695                 return -EINVAL;
4696
4697         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4698         if (IS_ERR(set))
4699                 return PTR_ERR(set);
4700
4701         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4702         if (skb2 == NULL)
4703                 return -ENOMEM;
4704
4705         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4706         if (err < 0)
4707                 goto err_fill_set_info;
4708
4709         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4710
4711 err_fill_set_info:
4712         kfree_skb(skb2);
4713         return err;
4714 }
4715
4716 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4717         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4718 };
4719
4720 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4721                                      struct nft_set_desc *desc)
4722 {
4723         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4724         u32 len;
4725         int err;
4726
4727         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4728                 return -E2BIG;
4729
4730         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4731                                           nft_concat_policy, NULL);
4732         if (err < 0)
4733                 return err;
4734
4735         if (!tb[NFTA_SET_FIELD_LEN])
4736                 return -EINVAL;
4737
4738         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4739         if (!len || len > U8_MAX)
4740                 return -EINVAL;
4741
4742         desc->field_len[desc->field_count++] = len;
4743
4744         return 0;
4745 }
4746
4747 static int nft_set_desc_concat(struct nft_set_desc *desc,
4748                                const struct nlattr *nla)
4749 {
4750         struct nlattr *attr;
4751         u32 num_regs = 0;
4752         int rem, err, i;
4753
4754         nla_for_each_nested(attr, nla, rem) {
4755                 if (nla_type(attr) != NFTA_LIST_ELEM)
4756                         return -EINVAL;
4757
4758                 err = nft_set_desc_concat_parse(attr, desc);
4759                 if (err < 0)
4760                         return err;
4761         }
4762
4763         for (i = 0; i < desc->field_count; i++)
4764                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4765
4766         if (num_regs > NFT_REG32_COUNT)
4767                 return -E2BIG;
4768
4769         return 0;
4770 }
4771
4772 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4773                                     const struct nlattr *nla)
4774 {
4775         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4776         int err;
4777
4778         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4779                                           nft_set_desc_policy, NULL);
4780         if (err < 0)
4781                 return err;
4782
4783         if (da[NFTA_SET_DESC_SIZE] != NULL)
4784                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4785         if (da[NFTA_SET_DESC_CONCAT])
4786                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4787
4788         return err;
4789 }
4790
4791 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4792                               const struct nlattr * const *nla,
4793                               struct nft_expr **exprs, int *num_exprs,
4794                               u32 flags)
4795 {
4796         struct nft_expr *expr;
4797         int err, i;
4798
4799         if (nla[NFTA_SET_EXPR]) {
4800                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4801                 if (IS_ERR(expr)) {
4802                         err = PTR_ERR(expr);
4803                         goto err_set_expr_alloc;
4804                 }
4805                 exprs[0] = expr;
4806                 (*num_exprs)++;
4807         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4808                 struct nlattr *tmp;
4809                 int left;
4810
4811                 if (!(flags & NFT_SET_EXPR)) {
4812                         err = -EINVAL;
4813                         goto err_set_expr_alloc;
4814                 }
4815                 i = 0;
4816                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4817                         if (i == NFT_SET_EXPR_MAX) {
4818                                 err = -E2BIG;
4819                                 goto err_set_expr_alloc;
4820                         }
4821                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4822                                 err = -EINVAL;
4823                                 goto err_set_expr_alloc;
4824                         }
4825                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4826                         if (IS_ERR(expr)) {
4827                                 err = PTR_ERR(expr);
4828                                 goto err_set_expr_alloc;
4829                         }
4830                         exprs[i++] = expr;
4831                         (*num_exprs)++;
4832                 }
4833         }
4834
4835         return 0;
4836
4837 err_set_expr_alloc:
4838         for (i = 0; i < *num_exprs; i++)
4839                 nft_expr_destroy(ctx, exprs[i]);
4840
4841         return err;
4842 }
4843
4844 static bool nft_set_is_same(const struct nft_set *set,
4845                             const struct nft_set_desc *desc,
4846                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4847 {
4848         int i;
4849
4850         if (set->ktype != desc->ktype ||
4851             set->dtype != desc->dtype ||
4852             set->flags != flags ||
4853             set->klen != desc->klen ||
4854             set->dlen != desc->dlen ||
4855             set->field_count != desc->field_count ||
4856             set->num_exprs != num_exprs)
4857                 return false;
4858
4859         for (i = 0; i < desc->field_count; i++) {
4860                 if (set->field_len[i] != desc->field_len[i])
4861                         return false;
4862         }
4863
4864         for (i = 0; i < num_exprs; i++) {
4865                 if (set->exprs[i]->ops != exprs[i]->ops)
4866                         return false;
4867         }
4868
4869         return true;
4870 }
4871
4872 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4873                             const struct nlattr * const nla[])
4874 {
4875         struct netlink_ext_ack *extack = info->extack;
4876         u8 genmask = nft_genmask_next(info->net);
4877         u8 family = info->nfmsg->nfgen_family;
4878         const struct nft_set_ops *ops;
4879         struct net *net = info->net;
4880         struct nft_set_desc desc;
4881         struct nft_table *table;
4882         unsigned char *udata;
4883         struct nft_set *set;
4884         struct nft_ctx ctx;
4885         size_t alloc_size;
4886         int num_exprs = 0;
4887         char *name;
4888         int err, i;
4889         u16 udlen;
4890         u32 flags;
4891         u64 size;
4892
4893         if (nla[NFTA_SET_TABLE] == NULL ||
4894             nla[NFTA_SET_NAME] == NULL ||
4895             nla[NFTA_SET_KEY_LEN] == NULL ||
4896             nla[NFTA_SET_ID] == NULL)
4897                 return -EINVAL;
4898
4899         memset(&desc, 0, sizeof(desc));
4900
4901         desc.ktype = NFT_DATA_VALUE;
4902         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4903                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4904                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4905                         return -EINVAL;
4906         }
4907
4908         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4909         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4910                 return -EINVAL;
4911
4912         flags = 0;
4913         if (nla[NFTA_SET_FLAGS] != NULL) {
4914                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4915                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4916                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4917                               NFT_SET_MAP | NFT_SET_EVAL |
4918                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4919                         return -EOPNOTSUPP;
4920                 /* Only one of these operations is supported */
4921                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4922                              (NFT_SET_MAP | NFT_SET_OBJECT))
4923                         return -EOPNOTSUPP;
4924                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4925                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4926                         return -EOPNOTSUPP;
4927         }
4928
4929         desc.dtype = 0;
4930         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4931                 if (!(flags & NFT_SET_MAP))
4932                         return -EINVAL;
4933
4934                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4935                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4936                     desc.dtype != NFT_DATA_VERDICT)
4937                         return -EINVAL;
4938
4939                 if (desc.dtype != NFT_DATA_VERDICT) {
4940                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4941                                 return -EINVAL;
4942                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4943                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4944                                 return -EINVAL;
4945                 } else
4946                         desc.dlen = sizeof(struct nft_verdict);
4947         } else if (flags & NFT_SET_MAP)
4948                 return -EINVAL;
4949
4950         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4951                 if (!(flags & NFT_SET_OBJECT))
4952                         return -EINVAL;
4953
4954                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4955                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4956                     desc.objtype > NFT_OBJECT_MAX)
4957                         return -EOPNOTSUPP;
4958         } else if (flags & NFT_SET_OBJECT)
4959                 return -EINVAL;
4960         else
4961                 desc.objtype = NFT_OBJECT_UNSPEC;
4962
4963         desc.timeout = 0;
4964         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4965                 if (!(flags & NFT_SET_TIMEOUT))
4966                         return -EINVAL;
4967
4968                 if (flags & NFT_SET_ANONYMOUS)
4969                         return -EOPNOTSUPP;
4970
4971                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4972                 if (err)
4973                         return err;
4974         }
4975         desc.gc_int = 0;
4976         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4977                 if (!(flags & NFT_SET_TIMEOUT))
4978                         return -EINVAL;
4979
4980                 if (flags & NFT_SET_ANONYMOUS)
4981                         return -EOPNOTSUPP;
4982
4983                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4984         }
4985
4986         desc.policy = NFT_SET_POL_PERFORMANCE;
4987         if (nla[NFTA_SET_POLICY] != NULL)
4988                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4989
4990         if (nla[NFTA_SET_DESC] != NULL) {
4991                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4992                 if (err < 0)
4993                         return err;
4994
4995                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4996                         return -EINVAL;
4997         } else if (flags & NFT_SET_CONCAT) {
4998                 return -EINVAL;
4999         }
5000
5001         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5002                 desc.expr = true;
5003
5004         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5005                                  NETLINK_CB(skb).portid);
5006         if (IS_ERR(table)) {
5007                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5008                 return PTR_ERR(table);
5009         }
5010
5011         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5012
5013         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5014         if (IS_ERR(set)) {
5015                 if (PTR_ERR(set) != -ENOENT) {
5016                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5017                         return PTR_ERR(set);
5018                 }
5019         } else {
5020                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5021
5022                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5023                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5024                         return -EEXIST;
5025                 }
5026                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5027                         return -EOPNOTSUPP;
5028
5029                 if (nft_set_is_anonymous(set))
5030                         return -EOPNOTSUPP;
5031
5032                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5033                 if (err < 0)
5034                         return err;
5035
5036                 err = 0;
5037                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5038                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5039                         err = -EEXIST;
5040                 }
5041
5042                 for (i = 0; i < num_exprs; i++)
5043                         nft_expr_destroy(&ctx, exprs[i]);
5044
5045                 if (err < 0)
5046                         return err;
5047
5048                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5049         }
5050
5051         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5052                 return -ENOENT;
5053
5054         ops = nft_select_set_ops(&ctx, nla, &desc);
5055         if (IS_ERR(ops))
5056                 return PTR_ERR(ops);
5057
5058         udlen = 0;
5059         if (nla[NFTA_SET_USERDATA])
5060                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5061
5062         size = 0;
5063         if (ops->privsize != NULL)
5064                 size = ops->privsize(nla, &desc);
5065         alloc_size = sizeof(*set) + size + udlen;
5066         if (alloc_size < size || alloc_size > INT_MAX)
5067                 return -ENOMEM;
5068
5069         if (!nft_use_inc(&table->use))
5070                 return -EMFILE;
5071
5072         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5073         if (!set) {
5074                 err = -ENOMEM;
5075                 goto err_alloc;
5076         }
5077
5078         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5079         if (!name) {
5080                 err = -ENOMEM;
5081                 goto err_set_name;
5082         }
5083
5084         err = nf_tables_set_alloc_name(&ctx, set, name);
5085         kfree(name);
5086         if (err < 0)
5087                 goto err_set_name;
5088
5089         udata = NULL;
5090         if (udlen) {
5091                 udata = set->data + size;
5092                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5093         }
5094
5095         INIT_LIST_HEAD(&set->bindings);
5096         INIT_LIST_HEAD(&set->catchall_list);
5097         refcount_set(&set->refs, 1);
5098         set->table = table;
5099         write_pnet(&set->net, net);
5100         set->ops = ops;
5101         set->ktype = desc.ktype;
5102         set->klen = desc.klen;
5103         set->dtype = desc.dtype;
5104         set->objtype = desc.objtype;
5105         set->dlen = desc.dlen;
5106         set->flags = flags;
5107         set->size = desc.size;
5108         set->policy = desc.policy;
5109         set->udlen = udlen;
5110         set->udata = udata;
5111         set->timeout = desc.timeout;
5112         set->gc_int = desc.gc_int;
5113
5114         set->field_count = desc.field_count;
5115         for (i = 0; i < desc.field_count; i++)
5116                 set->field_len[i] = desc.field_len[i];
5117
5118         err = ops->init(set, &desc, nla);
5119         if (err < 0)
5120                 goto err_set_init;
5121
5122         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5123         if (err < 0)
5124                 goto err_set_destroy;
5125
5126         set->num_exprs = num_exprs;
5127         set->handle = nf_tables_alloc_handle(table);
5128         INIT_LIST_HEAD(&set->pending_update);
5129
5130         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5131         if (err < 0)
5132                 goto err_set_expr_alloc;
5133
5134         list_add_tail_rcu(&set->list, &table->sets);
5135
5136         return 0;
5137
5138 err_set_expr_alloc:
5139         for (i = 0; i < set->num_exprs; i++)
5140                 nft_expr_destroy(&ctx, set->exprs[i]);
5141 err_set_destroy:
5142         ops->destroy(&ctx, set);
5143 err_set_init:
5144         kfree(set->name);
5145 err_set_name:
5146         kvfree(set);
5147 err_alloc:
5148         nft_use_dec_restore(&table->use);
5149
5150         return err;
5151 }
5152
5153 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5154                                      struct nft_set *set)
5155 {
5156         struct nft_set_elem_catchall *next, *catchall;
5157
5158         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5159                 list_del_rcu(&catchall->list);
5160                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5161                 kfree_rcu(catchall, rcu);
5162         }
5163 }
5164
5165 static void nft_set_put(struct nft_set *set)
5166 {
5167         if (refcount_dec_and_test(&set->refs)) {
5168                 kfree(set->name);
5169                 kvfree(set);
5170         }
5171 }
5172
5173 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5174 {
5175         int i;
5176
5177         if (WARN_ON(set->use > 0))
5178                 return;
5179
5180         for (i = 0; i < set->num_exprs; i++)
5181                 nft_expr_destroy(ctx, set->exprs[i]);
5182
5183         set->ops->destroy(ctx, set);
5184         nft_set_catchall_destroy(ctx, set);
5185         nft_set_put(set);
5186 }
5187
5188 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5189                             const struct nlattr * const nla[])
5190 {
5191         struct netlink_ext_ack *extack = info->extack;
5192         u8 genmask = nft_genmask_next(info->net);
5193         u8 family = info->nfmsg->nfgen_family;
5194         struct net *net = info->net;
5195         const struct nlattr *attr;
5196         struct nft_table *table;
5197         struct nft_set *set;
5198         struct nft_ctx ctx;
5199
5200         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5201                 return -EAFNOSUPPORT;
5202
5203         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5204                                  genmask, NETLINK_CB(skb).portid);
5205         if (IS_ERR(table)) {
5206                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5207                 return PTR_ERR(table);
5208         }
5209
5210         if (nla[NFTA_SET_HANDLE]) {
5211                 attr = nla[NFTA_SET_HANDLE];
5212                 set = nft_set_lookup_byhandle(table, attr, genmask);
5213         } else {
5214                 attr = nla[NFTA_SET_NAME];
5215                 set = nft_set_lookup(table, attr, genmask);
5216         }
5217
5218         if (IS_ERR(set)) {
5219                 if (PTR_ERR(set) == -ENOENT &&
5220                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5221                         return 0;
5222
5223                 NL_SET_BAD_ATTR(extack, attr);
5224                 return PTR_ERR(set);
5225         }
5226         if (set->use ||
5227             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5228              atomic_read(&set->nelems) > 0)) {
5229                 NL_SET_BAD_ATTR(extack, attr);
5230                 return -EBUSY;
5231         }
5232
5233         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5234
5235         return nft_delset(&ctx, set);
5236 }
5237
5238 static int nft_validate_register_store(const struct nft_ctx *ctx,
5239                                        enum nft_registers reg,
5240                                        const struct nft_data *data,
5241                                        enum nft_data_types type,
5242                                        unsigned int len);
5243
5244 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5245                                      struct nft_set *set,
5246                                      struct nft_set_elem *elem)
5247 {
5248         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5249         enum nft_registers dreg;
5250
5251         dreg = nft_type_to_reg(set->dtype);
5252         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5253                                            set->dtype == NFT_DATA_VERDICT ?
5254                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5255                                            set->dlen);
5256 }
5257
5258 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5259                                         struct nft_set *set,
5260                                         const struct nft_set_iter *iter,
5261                                         struct nft_set_elem *elem)
5262 {
5263         return nft_setelem_data_validate(ctx, set, elem);
5264 }
5265
5266 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5267                                        struct nft_set *set)
5268 {
5269         u8 genmask = nft_genmask_next(ctx->net);
5270         struct nft_set_elem_catchall *catchall;
5271         struct nft_set_elem elem;
5272         struct nft_set_ext *ext;
5273         int ret = 0;
5274
5275         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5276                 ext = nft_set_elem_ext(set, catchall->elem);
5277                 if (!nft_set_elem_active(ext, genmask))
5278                         continue;
5279
5280                 elem.priv = catchall->elem;
5281                 ret = nft_setelem_data_validate(ctx, set, &elem);
5282                 if (ret < 0)
5283                         break;
5284         }
5285
5286         return ret;
5287 }
5288
5289 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5290                        struct nft_set_binding *binding)
5291 {
5292         struct nft_set_binding *i;
5293         struct nft_set_iter iter;
5294
5295         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5296                 return -EBUSY;
5297
5298         if (binding->flags & NFT_SET_MAP) {
5299                 /* If the set is already bound to the same chain all
5300                  * jumps are already validated for that chain.
5301                  */
5302                 list_for_each_entry(i, &set->bindings, list) {
5303                         if (i->flags & NFT_SET_MAP &&
5304                             i->chain == binding->chain)
5305                                 goto bind;
5306                 }
5307
5308                 iter.genmask    = nft_genmask_next(ctx->net);
5309                 iter.skip       = 0;
5310                 iter.count      = 0;
5311                 iter.err        = 0;
5312                 iter.fn         = nf_tables_bind_check_setelem;
5313
5314                 set->ops->walk(ctx, set, &iter);
5315                 if (!iter.err)
5316                         iter.err = nft_set_catchall_bind_check(ctx, set);
5317
5318                 if (iter.err < 0)
5319                         return iter.err;
5320         }
5321 bind:
5322         if (!nft_use_inc(&set->use))
5323                 return -EMFILE;
5324
5325         binding->chain = ctx->chain;
5326         list_add_tail_rcu(&binding->list, &set->bindings);
5327         nft_set_trans_bind(ctx, set);
5328
5329         return 0;
5330 }
5331 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5332
5333 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5334                                  struct nft_set_binding *binding, bool event)
5335 {
5336         list_del_rcu(&binding->list);
5337
5338         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5339                 list_del_rcu(&set->list);
5340                 if (event)
5341                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5342                                              GFP_KERNEL);
5343         }
5344 }
5345
5346 static void nft_setelem_data_activate(const struct net *net,
5347                                       const struct nft_set *set,
5348                                       struct nft_set_elem *elem);
5349
5350 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5351                                 struct nft_set *set,
5352                                 const struct nft_set_iter *iter,
5353                                 struct nft_set_elem *elem)
5354 {
5355         nft_setelem_data_activate(ctx->net, set, elem);
5356
5357         return 0;
5358 }
5359
5360 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5361                                       struct nft_set *set)
5362 {
5363         u8 genmask = nft_genmask_next(ctx->net);
5364         struct nft_set_elem_catchall *catchall;
5365         struct nft_set_elem elem;
5366         struct nft_set_ext *ext;
5367
5368         list_for_each_entry(catchall, &set->catchall_list, list) {
5369                 ext = nft_set_elem_ext(set, catchall->elem);
5370                 if (!nft_set_elem_active(ext, genmask))
5371                         continue;
5372
5373                 elem.priv = catchall->elem;
5374                 nft_setelem_data_activate(ctx->net, set, &elem);
5375                 break;
5376         }
5377 }
5378
5379 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5380 {
5381         struct nft_set_iter iter = {
5382                 .genmask        = nft_genmask_next(ctx->net),
5383                 .fn             = nft_mapelem_activate,
5384         };
5385
5386         set->ops->walk(ctx, set, &iter);
5387         WARN_ON_ONCE(iter.err);
5388
5389         nft_map_catchall_activate(ctx, set);
5390 }
5391
5392 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5393 {
5394         if (nft_set_is_anonymous(set)) {
5395                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5396                         nft_map_activate(ctx, set);
5397
5398                 nft_clear(ctx->net, set);
5399         }
5400
5401         nft_use_inc_restore(&set->use);
5402 }
5403 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5404
5405 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5406                               struct nft_set_binding *binding,
5407                               enum nft_trans_phase phase)
5408 {
5409         switch (phase) {
5410         case NFT_TRANS_PREPARE_ERROR:
5411                 nft_set_trans_unbind(ctx, set);
5412                 if (nft_set_is_anonymous(set))
5413                         nft_deactivate_next(ctx->net, set);
5414                 else
5415                         list_del_rcu(&binding->list);
5416
5417                 nft_use_dec(&set->use);
5418                 break;
5419         case NFT_TRANS_PREPARE:
5420                 if (nft_set_is_anonymous(set)) {
5421                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5422                                 nft_map_deactivate(ctx, set);
5423
5424                         nft_deactivate_next(ctx->net, set);
5425                 }
5426                 nft_use_dec(&set->use);
5427                 return;
5428         case NFT_TRANS_ABORT:
5429         case NFT_TRANS_RELEASE:
5430                 if (nft_set_is_anonymous(set) &&
5431                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5432                         nft_map_deactivate(ctx, set);
5433
5434                 nft_use_dec(&set->use);
5435                 fallthrough;
5436         default:
5437                 nf_tables_unbind_set(ctx, set, binding,
5438                                      phase == NFT_TRANS_COMMIT);
5439         }
5440 }
5441 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5442
5443 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5444 {
5445         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5446                 nft_set_destroy(ctx, set);
5447 }
5448 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5449
5450 const struct nft_set_ext_type nft_set_ext_types[] = {
5451         [NFT_SET_EXT_KEY]               = {
5452                 .align  = __alignof__(u32),
5453         },
5454         [NFT_SET_EXT_DATA]              = {
5455                 .align  = __alignof__(u32),
5456         },
5457         [NFT_SET_EXT_EXPRESSIONS]       = {
5458                 .align  = __alignof__(struct nft_set_elem_expr),
5459         },
5460         [NFT_SET_EXT_OBJREF]            = {
5461                 .len    = sizeof(struct nft_object *),
5462                 .align  = __alignof__(struct nft_object *),
5463         },
5464         [NFT_SET_EXT_FLAGS]             = {
5465                 .len    = sizeof(u8),
5466                 .align  = __alignof__(u8),
5467         },
5468         [NFT_SET_EXT_TIMEOUT]           = {
5469                 .len    = sizeof(u64),
5470                 .align  = __alignof__(u64),
5471         },
5472         [NFT_SET_EXT_EXPIRATION]        = {
5473                 .len    = sizeof(u64),
5474                 .align  = __alignof__(u64),
5475         },
5476         [NFT_SET_EXT_USERDATA]          = {
5477                 .len    = sizeof(struct nft_userdata),
5478                 .align  = __alignof__(struct nft_userdata),
5479         },
5480         [NFT_SET_EXT_KEY_END]           = {
5481                 .align  = __alignof__(u32),
5482         },
5483 };
5484
5485 /*
5486  * Set elements
5487  */
5488
5489 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5490         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5491         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5492         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5493         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5494         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5495         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5496                                             .len = NFT_USERDATA_MAXLEN },
5497         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5498         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5499                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5500         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5501         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5502 };
5503
5504 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5505         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5506                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5507         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5508                                             .len = NFT_SET_MAXNAMELEN - 1 },
5509         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5510         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5511 };
5512
5513 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5514                                   const struct nft_set *set,
5515                                   const struct nft_set_ext *ext,
5516                                   bool reset)
5517 {
5518         struct nft_set_elem_expr *elem_expr;
5519         u32 size, num_exprs = 0;
5520         struct nft_expr *expr;
5521         struct nlattr *nest;
5522
5523         elem_expr = nft_set_ext_expr(ext);
5524         nft_setelem_expr_foreach(expr, elem_expr, size)
5525                 num_exprs++;
5526
5527         if (num_exprs == 1) {
5528                 expr = nft_setelem_expr_at(elem_expr, 0);
5529                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5530                         return -1;
5531
5532                 return 0;
5533         } else if (num_exprs > 1) {
5534                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5535                 if (nest == NULL)
5536                         goto nla_put_failure;
5537
5538                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5539                         expr = nft_setelem_expr_at(elem_expr, size);
5540                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5541                                 goto nla_put_failure;
5542                 }
5543                 nla_nest_end(skb, nest);
5544         }
5545         return 0;
5546
5547 nla_put_failure:
5548         return -1;
5549 }
5550
5551 static int nf_tables_fill_setelem(struct sk_buff *skb,
5552                                   const struct nft_set *set,
5553                                   const struct nft_set_elem *elem,
5554                                   bool reset)
5555 {
5556         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5557         unsigned char *b = skb_tail_pointer(skb);
5558         struct nlattr *nest;
5559         u64 timeout = 0;
5560
5561         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5562         if (nest == NULL)
5563                 goto nla_put_failure;
5564
5565         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5566             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5567                           NFT_DATA_VALUE, set->klen) < 0)
5568                 goto nla_put_failure;
5569
5570         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5571             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5572                           NFT_DATA_VALUE, set->klen) < 0)
5573                 goto nla_put_failure;
5574
5575         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5576             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5577                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5578                           set->dlen) < 0)
5579                 goto nla_put_failure;
5580
5581         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5582             nft_set_elem_expr_dump(skb, set, ext, reset))
5583                 goto nla_put_failure;
5584
5585         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5586             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5587                            (*nft_set_ext_obj(ext))->key.name) < 0)
5588                 goto nla_put_failure;
5589
5590         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5591             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5592                          htonl(*nft_set_ext_flags(ext))))
5593                 goto nla_put_failure;
5594
5595         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) {
5596                 timeout = *nft_set_ext_timeout(ext);
5597                 if (nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5598                                  nf_jiffies64_to_msecs(timeout),
5599                                  NFTA_SET_ELEM_PAD))
5600                         goto nla_put_failure;
5601         } else if (set->flags & NFT_SET_TIMEOUT) {
5602                 timeout = READ_ONCE(set->timeout);
5603         }
5604
5605         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5606                 u64 expires, now = get_jiffies_64();
5607
5608                 expires = *nft_set_ext_expiration(ext);
5609                 if (time_before64(now, expires))
5610                         expires -= now;
5611                 else
5612                         expires = 0;
5613
5614                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5615                                  nf_jiffies64_to_msecs(expires),
5616                                  NFTA_SET_ELEM_PAD))
5617                         goto nla_put_failure;
5618
5619                 if (reset)
5620                         *nft_set_ext_expiration(ext) = now + timeout;
5621         }
5622
5623         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5624                 struct nft_userdata *udata;
5625
5626                 udata = nft_set_ext_userdata(ext);
5627                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5628                             udata->len + 1, udata->data))
5629                         goto nla_put_failure;
5630         }
5631
5632         nla_nest_end(skb, nest);
5633         return 0;
5634
5635 nla_put_failure:
5636         nlmsg_trim(skb, b);
5637         return -EMSGSIZE;
5638 }
5639
5640 struct nft_set_dump_args {
5641         const struct netlink_callback   *cb;
5642         struct nft_set_iter             iter;
5643         struct sk_buff                  *skb;
5644         bool                            reset;
5645 };
5646
5647 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5648                                   struct nft_set *set,
5649                                   const struct nft_set_iter *iter,
5650                                   struct nft_set_elem *elem)
5651 {
5652         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5653         struct nft_set_dump_args *args;
5654
5655         if (nft_set_elem_expired(ext))
5656                 return 0;
5657
5658         args = container_of(iter, struct nft_set_dump_args, iter);
5659         return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5660 }
5661
5662 static void audit_log_nft_set_reset(const struct nft_table *table,
5663                                     unsigned int base_seq,
5664                                     unsigned int nentries)
5665 {
5666         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5667
5668         audit_log_nfcfg(buf, table->family, nentries,
5669                         AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5670         kfree(buf);
5671 }
5672
5673 struct nft_set_dump_ctx {
5674         const struct nft_set    *set;
5675         struct nft_ctx          ctx;
5676 };
5677
5678 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5679                                  const struct nft_set *set, bool reset,
5680                                  unsigned int base_seq)
5681 {
5682         struct nft_set_elem_catchall *catchall;
5683         u8 genmask = nft_genmask_cur(net);
5684         struct nft_set_elem elem;
5685         struct nft_set_ext *ext;
5686         int ret = 0;
5687
5688         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5689                 ext = nft_set_elem_ext(set, catchall->elem);
5690                 if (!nft_set_elem_active(ext, genmask) ||
5691                     nft_set_elem_expired(ext))
5692                         continue;
5693
5694                 elem.priv = catchall->elem;
5695                 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5696                 if (reset && !ret)
5697                         audit_log_nft_set_reset(set->table, base_seq, 1);
5698                 break;
5699         }
5700
5701         return ret;
5702 }
5703
5704 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5705 {
5706         struct nft_set_dump_ctx *dump_ctx = cb->data;
5707         struct net *net = sock_net(skb->sk);
5708         struct nftables_pernet *nft_net;
5709         struct nft_table *table;
5710         struct nft_set *set;
5711         struct nft_set_dump_args args;
5712         bool set_found = false;
5713         struct nlmsghdr *nlh;
5714         struct nlattr *nest;
5715         bool reset = false;
5716         u32 portid, seq;
5717         int event;
5718
5719         rcu_read_lock();
5720         nft_net = nft_pernet(net);
5721         cb->seq = READ_ONCE(nft_net->base_seq);
5722
5723         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5724                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5725                     dump_ctx->ctx.family != table->family)
5726                         continue;
5727
5728                 if (table != dump_ctx->ctx.table)
5729                         continue;
5730
5731                 list_for_each_entry_rcu(set, &table->sets, list) {
5732                         if (set == dump_ctx->set) {
5733                                 set_found = true;
5734                                 break;
5735                         }
5736                 }
5737                 break;
5738         }
5739
5740         if (!set_found) {
5741                 rcu_read_unlock();
5742                 return -ENOENT;
5743         }
5744
5745         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5746         portid = NETLINK_CB(cb->skb).portid;
5747         seq    = cb->nlh->nlmsg_seq;
5748
5749         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5750                            table->family, NFNETLINK_V0, nft_base_seq(net));
5751         if (!nlh)
5752                 goto nla_put_failure;
5753
5754         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5755                 goto nla_put_failure;
5756         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5757                 goto nla_put_failure;
5758
5759         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5760         if (nest == NULL)
5761                 goto nla_put_failure;
5762
5763         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5764                 reset = true;
5765
5766         args.cb                 = cb;
5767         args.skb                = skb;
5768         args.reset              = reset;
5769         args.iter.genmask       = nft_genmask_cur(net);
5770         args.iter.skip          = cb->args[0];
5771         args.iter.count         = 0;
5772         args.iter.err           = 0;
5773         args.iter.fn            = nf_tables_dump_setelem;
5774         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5775
5776         if (!args.iter.err && args.iter.count == cb->args[0])
5777                 args.iter.err = nft_set_catchall_dump(net, skb, set,
5778                                                       reset, cb->seq);
5779         nla_nest_end(skb, nest);
5780         nlmsg_end(skb, nlh);
5781
5782         if (reset && args.iter.count > args.iter.skip)
5783                 audit_log_nft_set_reset(table, cb->seq,
5784                                         args.iter.count - args.iter.skip);
5785
5786         rcu_read_unlock();
5787
5788         if (args.iter.err && args.iter.err != -EMSGSIZE)
5789                 return args.iter.err;
5790         if (args.iter.count == cb->args[0])
5791                 return 0;
5792
5793         cb->args[0] = args.iter.count;
5794         return skb->len;
5795
5796 nla_put_failure:
5797         rcu_read_unlock();
5798         return -ENOSPC;
5799 }
5800
5801 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5802 {
5803         struct nft_set_dump_ctx *dump_ctx = cb->data;
5804
5805         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5806
5807         return cb->data ? 0 : -ENOMEM;
5808 }
5809
5810 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5811 {
5812         kfree(cb->data);
5813         return 0;
5814 }
5815
5816 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5817                                        const struct nft_ctx *ctx, u32 seq,
5818                                        u32 portid, int event, u16 flags,
5819                                        const struct nft_set *set,
5820                                        const struct nft_set_elem *elem,
5821                                        bool reset)
5822 {
5823         struct nlmsghdr *nlh;
5824         struct nlattr *nest;
5825         int err;
5826
5827         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5828         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5829                            NFNETLINK_V0, nft_base_seq(ctx->net));
5830         if (!nlh)
5831                 goto nla_put_failure;
5832
5833         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5834                 goto nla_put_failure;
5835         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5836                 goto nla_put_failure;
5837
5838         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5839         if (nest == NULL)
5840                 goto nla_put_failure;
5841
5842         err = nf_tables_fill_setelem(skb, set, elem, reset);
5843         if (err < 0)
5844                 goto nla_put_failure;
5845
5846         nla_nest_end(skb, nest);
5847
5848         nlmsg_end(skb, nlh);
5849         return 0;
5850
5851 nla_put_failure:
5852         nlmsg_trim(skb, nlh);
5853         return -1;
5854 }
5855
5856 static int nft_setelem_parse_flags(const struct nft_set *set,
5857                                    const struct nlattr *attr, u32 *flags)
5858 {
5859         if (attr == NULL)
5860                 return 0;
5861
5862         *flags = ntohl(nla_get_be32(attr));
5863         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5864                 return -EOPNOTSUPP;
5865         if (!(set->flags & NFT_SET_INTERVAL) &&
5866             *flags & NFT_SET_ELEM_INTERVAL_END)
5867                 return -EINVAL;
5868         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5869             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5870                 return -EINVAL;
5871
5872         return 0;
5873 }
5874
5875 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5876                                  struct nft_data *key, struct nlattr *attr)
5877 {
5878         struct nft_data_desc desc = {
5879                 .type   = NFT_DATA_VALUE,
5880                 .size   = NFT_DATA_VALUE_MAXLEN,
5881                 .len    = set->klen,
5882         };
5883
5884         return nft_data_init(ctx, key, &desc, attr);
5885 }
5886
5887 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5888                                   struct nft_data_desc *desc,
5889                                   struct nft_data *data,
5890                                   struct nlattr *attr)
5891 {
5892         u32 dtype;
5893
5894         if (set->dtype == NFT_DATA_VERDICT)
5895                 dtype = NFT_DATA_VERDICT;
5896         else
5897                 dtype = NFT_DATA_VALUE;
5898
5899         desc->type = dtype;
5900         desc->size = NFT_DATA_VALUE_MAXLEN;
5901         desc->len = set->dlen;
5902         desc->flags = NFT_DATA_DESC_SETELEM;
5903
5904         return nft_data_init(ctx, data, desc, attr);
5905 }
5906
5907 static void *nft_setelem_catchall_get(const struct net *net,
5908                                       const struct nft_set *set)
5909 {
5910         struct nft_set_elem_catchall *catchall;
5911         u8 genmask = nft_genmask_cur(net);
5912         struct nft_set_ext *ext;
5913         void *priv = NULL;
5914
5915         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5916                 ext = nft_set_elem_ext(set, catchall->elem);
5917                 if (!nft_set_elem_active(ext, genmask) ||
5918                     nft_set_elem_expired(ext))
5919                         continue;
5920
5921                 priv = catchall->elem;
5922                 break;
5923         }
5924
5925         return priv;
5926 }
5927
5928 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5929                            struct nft_set_elem *elem, u32 flags)
5930 {
5931         void *priv;
5932
5933         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5934                 priv = set->ops->get(ctx->net, set, elem, flags);
5935                 if (IS_ERR(priv))
5936                         return PTR_ERR(priv);
5937         } else {
5938                 priv = nft_setelem_catchall_get(ctx->net, set);
5939                 if (!priv)
5940                         return -ENOENT;
5941         }
5942         elem->priv = priv;
5943
5944         return 0;
5945 }
5946
5947 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5948                             const struct nlattr *attr, bool reset)
5949 {
5950         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5951         struct nft_set_elem elem;
5952         struct sk_buff *skb;
5953         uint32_t flags = 0;
5954         int err;
5955
5956         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5957                                           nft_set_elem_policy, NULL);
5958         if (err < 0)
5959                 return err;
5960
5961         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5962         if (err < 0)
5963                 return err;
5964
5965         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5966                 return -EINVAL;
5967
5968         if (nla[NFTA_SET_ELEM_KEY]) {
5969                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5970                                             nla[NFTA_SET_ELEM_KEY]);
5971                 if (err < 0)
5972                         return err;
5973         }
5974
5975         if (nla[NFTA_SET_ELEM_KEY_END]) {
5976                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5977                                             nla[NFTA_SET_ELEM_KEY_END]);
5978                 if (err < 0)
5979                         return err;
5980         }
5981
5982         err = nft_setelem_get(ctx, set, &elem, flags);
5983         if (err < 0)
5984                 return err;
5985
5986         err = -ENOMEM;
5987         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5988         if (skb == NULL)
5989                 return err;
5990
5991         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5992                                           NFT_MSG_NEWSETELEM, 0, set, &elem,
5993                                           reset);
5994         if (err < 0)
5995                 goto err_fill_setelem;
5996
5997         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5998
5999 err_fill_setelem:
6000         kfree_skb(skb);
6001         return err;
6002 }
6003
6004 /* called with rcu_read_lock held */
6005 static int nf_tables_getsetelem(struct sk_buff *skb,
6006                                 const struct nfnl_info *info,
6007                                 const struct nlattr * const nla[])
6008 {
6009         struct netlink_ext_ack *extack = info->extack;
6010         u8 genmask = nft_genmask_cur(info->net);
6011         u8 family = info->nfmsg->nfgen_family;
6012         int rem, err = 0, nelems = 0;
6013         struct net *net = info->net;
6014         struct nft_table *table;
6015         struct nft_set *set;
6016         struct nlattr *attr;
6017         struct nft_ctx ctx;
6018         bool reset = false;
6019
6020         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6021                                  genmask, 0);
6022         if (IS_ERR(table)) {
6023                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6024                 return PTR_ERR(table);
6025         }
6026
6027         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6028         if (IS_ERR(set))
6029                 return PTR_ERR(set);
6030
6031         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6032
6033         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6034                 struct netlink_dump_control c = {
6035                         .start = nf_tables_dump_set_start,
6036                         .dump = nf_tables_dump_set,
6037                         .done = nf_tables_dump_set_done,
6038                         .module = THIS_MODULE,
6039                 };
6040                 struct nft_set_dump_ctx dump_ctx = {
6041                         .set = set,
6042                         .ctx = ctx,
6043                 };
6044
6045                 c.data = &dump_ctx;
6046                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6047         }
6048
6049         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6050                 return -EINVAL;
6051
6052         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6053                 reset = true;
6054
6055         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6056                 err = nft_get_set_elem(&ctx, set, attr, reset);
6057                 if (err < 0) {
6058                         NL_SET_BAD_ATTR(extack, attr);
6059                         break;
6060                 }
6061                 nelems++;
6062         }
6063
6064         if (reset)
6065                 audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6066                                         nelems);
6067
6068         return err;
6069 }
6070
6071 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6072                                      const struct nft_set *set,
6073                                      const struct nft_set_elem *elem,
6074                                      int event)
6075 {
6076         struct nftables_pernet *nft_net;
6077         struct net *net = ctx->net;
6078         u32 portid = ctx->portid;
6079         struct sk_buff *skb;
6080         u16 flags = 0;
6081         int err;
6082
6083         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6084                 return;
6085
6086         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6087         if (skb == NULL)
6088                 goto err;
6089
6090         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6091                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6092
6093         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6094                                           set, elem, false);
6095         if (err < 0) {
6096                 kfree_skb(skb);
6097                 goto err;
6098         }
6099
6100         nft_net = nft_pernet(net);
6101         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6102         return;
6103 err:
6104         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6105 }
6106
6107 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6108                                               int msg_type,
6109                                               struct nft_set *set)
6110 {
6111         struct nft_trans *trans;
6112
6113         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6114         if (trans == NULL)
6115                 return NULL;
6116
6117         nft_trans_elem_set(trans) = set;
6118         return trans;
6119 }
6120
6121 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6122                                          const struct nft_set *set,
6123                                          const struct nlattr *attr)
6124 {
6125         struct nft_expr *expr;
6126         int err;
6127
6128         expr = nft_expr_init(ctx, attr);
6129         if (IS_ERR(expr))
6130                 return expr;
6131
6132         err = -EOPNOTSUPP;
6133         if (expr->ops->type->flags & NFT_EXPR_GC) {
6134                 if (set->flags & NFT_SET_TIMEOUT)
6135                         goto err_set_elem_expr;
6136                 if (!set->ops->gc_init)
6137                         goto err_set_elem_expr;
6138                 set->ops->gc_init(set);
6139         }
6140
6141         return expr;
6142
6143 err_set_elem_expr:
6144         nft_expr_destroy(ctx, expr);
6145         return ERR_PTR(err);
6146 }
6147
6148 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6149 {
6150         len += nft_set_ext_types[id].len;
6151         if (len > tmpl->ext_len[id] ||
6152             len > U8_MAX)
6153                 return -1;
6154
6155         return 0;
6156 }
6157
6158 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6159                               void *to, const void *from, u32 len)
6160 {
6161         if (nft_set_ext_check(tmpl, id, len) < 0)
6162                 return -1;
6163
6164         memcpy(to, from, len);
6165
6166         return 0;
6167 }
6168
6169 void *nft_set_elem_init(const struct nft_set *set,
6170                         const struct nft_set_ext_tmpl *tmpl,
6171                         const u32 *key, const u32 *key_end,
6172                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6173 {
6174         struct nft_set_ext *ext;
6175         void *elem;
6176
6177         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6178         if (elem == NULL)
6179                 return ERR_PTR(-ENOMEM);
6180
6181         ext = nft_set_elem_ext(set, elem);
6182         nft_set_ext_init(ext, tmpl);
6183
6184         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6185             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6186                                nft_set_ext_key(ext), key, set->klen) < 0)
6187                 goto err_ext_check;
6188
6189         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6190             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6191                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6192                 goto err_ext_check;
6193
6194         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6195             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6196                                nft_set_ext_data(ext), data, set->dlen) < 0)
6197                 goto err_ext_check;
6198
6199         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6200                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6201                 if (expiration == 0)
6202                         *nft_set_ext_expiration(ext) += timeout;
6203         }
6204         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6205                 *nft_set_ext_timeout(ext) = timeout;
6206
6207         return elem;
6208
6209 err_ext_check:
6210         kfree(elem);
6211
6212         return ERR_PTR(-EINVAL);
6213 }
6214
6215 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6216                                         struct nft_expr *expr)
6217 {
6218         if (expr->ops->destroy_clone) {
6219                 expr->ops->destroy_clone(ctx, expr);
6220                 module_put(expr->ops->type->owner);
6221         } else {
6222                 nf_tables_expr_destroy(ctx, expr);
6223         }
6224 }
6225
6226 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6227                                       struct nft_set_elem_expr *elem_expr)
6228 {
6229         struct nft_expr *expr;
6230         u32 size;
6231
6232         nft_setelem_expr_foreach(expr, elem_expr, size)
6233                 __nft_set_elem_expr_destroy(ctx, expr);
6234 }
6235
6236 /* Drop references and destroy. Called from gc, dynset and abort path. */
6237 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6238                           bool destroy_expr)
6239 {
6240         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6241         struct nft_ctx ctx = {
6242                 .net    = read_pnet(&set->net),
6243                 .family = set->table->family,
6244         };
6245
6246         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6247         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6248                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6249         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6250                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6251
6252         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6253                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6254         kfree(elem);
6255 }
6256 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6257
6258 /* Destroy element. References have been already dropped in the preparation
6259  * path via nft_setelem_data_deactivate().
6260  */
6261 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6262                                 const struct nft_set *set, void *elem)
6263 {
6264         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6265
6266         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6267                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6268
6269         kfree(elem);
6270 }
6271
6272 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6273                             struct nft_expr *expr_array[])
6274 {
6275         struct nft_expr *expr;
6276         int err, i, k;
6277
6278         for (i = 0; i < set->num_exprs; i++) {
6279                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6280                 if (!expr)
6281                         goto err_expr;
6282
6283                 err = nft_expr_clone(expr, set->exprs[i]);
6284                 if (err < 0) {
6285                         kfree(expr);
6286                         goto err_expr;
6287                 }
6288                 expr_array[i] = expr;
6289         }
6290
6291         return 0;
6292
6293 err_expr:
6294         for (k = i - 1; k >= 0; k--)
6295                 nft_expr_destroy(ctx, expr_array[k]);
6296
6297         return -ENOMEM;
6298 }
6299
6300 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6301                                    const struct nft_set_ext_tmpl *tmpl,
6302                                    const struct nft_set_ext *ext,
6303                                    struct nft_expr *expr_array[],
6304                                    u32 num_exprs)
6305 {
6306         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6307         u32 len = sizeof(struct nft_set_elem_expr);
6308         struct nft_expr *expr;
6309         int i, err;
6310
6311         if (num_exprs == 0)
6312                 return 0;
6313
6314         for (i = 0; i < num_exprs; i++)
6315                 len += expr_array[i]->ops->size;
6316
6317         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6318                 return -EINVAL;
6319
6320         for (i = 0; i < num_exprs; i++) {
6321                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6322                 err = nft_expr_clone(expr, expr_array[i]);
6323                 if (err < 0)
6324                         goto err_elem_expr_setup;
6325
6326                 elem_expr->size += expr_array[i]->ops->size;
6327                 nft_expr_destroy(ctx, expr_array[i]);
6328                 expr_array[i] = NULL;
6329         }
6330
6331         return 0;
6332
6333 err_elem_expr_setup:
6334         for (; i < num_exprs; i++) {
6335                 nft_expr_destroy(ctx, expr_array[i]);
6336                 expr_array[i] = NULL;
6337         }
6338
6339         return -ENOMEM;
6340 }
6341
6342 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6343                                             const struct nft_set *set)
6344 {
6345         struct nft_set_elem_catchall *catchall;
6346         u8 genmask = nft_genmask_cur(net);
6347         struct nft_set_ext *ext;
6348
6349         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6350                 ext = nft_set_elem_ext(set, catchall->elem);
6351                 if (nft_set_elem_active(ext, genmask) &&
6352                     !nft_set_elem_expired(ext) &&
6353                     !nft_set_elem_is_dead(ext))
6354                         return ext;
6355         }
6356
6357         return NULL;
6358 }
6359 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6360
6361 static int nft_setelem_catchall_insert(const struct net *net,
6362                                        struct nft_set *set,
6363                                        const struct nft_set_elem *elem,
6364                                        struct nft_set_ext **pext)
6365 {
6366         struct nft_set_elem_catchall *catchall;
6367         u8 genmask = nft_genmask_next(net);
6368         struct nft_set_ext *ext;
6369
6370         list_for_each_entry(catchall, &set->catchall_list, list) {
6371                 ext = nft_set_elem_ext(set, catchall->elem);
6372                 if (nft_set_elem_active(ext, genmask)) {
6373                         *pext = ext;
6374                         return -EEXIST;
6375                 }
6376         }
6377
6378         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6379         if (!catchall)
6380                 return -ENOMEM;
6381
6382         catchall->elem = elem->priv;
6383         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6384
6385         return 0;
6386 }
6387
6388 static int nft_setelem_insert(const struct net *net,
6389                               struct nft_set *set,
6390                               const struct nft_set_elem *elem,
6391                               struct nft_set_ext **ext, unsigned int flags)
6392 {
6393         int ret;
6394
6395         if (flags & NFT_SET_ELEM_CATCHALL)
6396                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6397         else
6398                 ret = set->ops->insert(net, set, elem, ext);
6399
6400         return ret;
6401 }
6402
6403 static bool nft_setelem_is_catchall(const struct nft_set *set,
6404                                     const struct nft_set_elem *elem)
6405 {
6406         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6407
6408         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6409             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6410                 return true;
6411
6412         return false;
6413 }
6414
6415 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6416                                  struct nft_set_elem *elem)
6417 {
6418         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6419
6420         if (nft_setelem_is_catchall(set, elem)) {
6421                 nft_set_elem_change_active(net, set, ext);
6422         } else {
6423                 set->ops->activate(net, set, elem);
6424         }
6425 }
6426
6427 static int nft_setelem_catchall_deactivate(const struct net *net,
6428                                            struct nft_set *set,
6429                                            struct nft_set_elem *elem)
6430 {
6431         struct nft_set_elem_catchall *catchall;
6432         struct nft_set_ext *ext;
6433
6434         list_for_each_entry(catchall, &set->catchall_list, list) {
6435                 ext = nft_set_elem_ext(set, catchall->elem);
6436                 if (!nft_is_active(net, ext))
6437                         continue;
6438
6439                 kfree(elem->priv);
6440                 elem->priv = catchall->elem;
6441                 nft_set_elem_change_active(net, set, ext);
6442                 return 0;
6443         }
6444
6445         return -ENOENT;
6446 }
6447
6448 static int __nft_setelem_deactivate(const struct net *net,
6449                                     struct nft_set *set,
6450                                     struct nft_set_elem *elem)
6451 {
6452         void *priv;
6453
6454         priv = set->ops->deactivate(net, set, elem);
6455         if (!priv)
6456                 return -ENOENT;
6457
6458         kfree(elem->priv);
6459         elem->priv = priv;
6460         set->ndeact++;
6461
6462         return 0;
6463 }
6464
6465 static int nft_setelem_deactivate(const struct net *net,
6466                                   struct nft_set *set,
6467                                   struct nft_set_elem *elem, u32 flags)
6468 {
6469         int ret;
6470
6471         if (flags & NFT_SET_ELEM_CATCHALL)
6472                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6473         else
6474                 ret = __nft_setelem_deactivate(net, set, elem);
6475
6476         return ret;
6477 }
6478
6479 static void nft_setelem_catchall_remove(const struct net *net,
6480                                         const struct nft_set *set,
6481                                         const struct nft_set_elem *elem)
6482 {
6483         struct nft_set_elem_catchall *catchall, *next;
6484
6485         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6486                 if (catchall->elem == elem->priv) {
6487                         list_del_rcu(&catchall->list);
6488                         kfree_rcu(catchall, rcu);
6489                         break;
6490                 }
6491         }
6492 }
6493
6494 static void nft_setelem_remove(const struct net *net,
6495                                const struct nft_set *set,
6496                                const struct nft_set_elem *elem)
6497 {
6498         if (nft_setelem_is_catchall(set, elem))
6499                 nft_setelem_catchall_remove(net, set, elem);
6500         else
6501                 set->ops->remove(net, set, elem);
6502 }
6503
6504 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6505                                       struct nlattr **nla, u32 flags)
6506 {
6507         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6508                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6509                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6510                         return false;
6511
6512                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6513                     flags & NFT_SET_ELEM_CATCHALL)
6514                         return false;
6515         } else {
6516                 if (nla[NFTA_SET_ELEM_KEY_END])
6517                         return false;
6518         }
6519
6520         return true;
6521 }
6522
6523 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6524                             const struct nlattr *attr, u32 nlmsg_flags)
6525 {
6526         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6527         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6528         u8 genmask = nft_genmask_next(ctx->net);
6529         u32 flags = 0, size = 0, num_exprs = 0;
6530         struct nft_set_ext_tmpl tmpl;
6531         struct nft_set_ext *ext, *ext2;
6532         struct nft_set_elem elem;
6533         struct nft_set_binding *binding;
6534         struct nft_object *obj = NULL;
6535         struct nft_userdata *udata;
6536         struct nft_data_desc desc;
6537         enum nft_registers dreg;
6538         struct nft_trans *trans;
6539         u64 timeout;
6540         u64 expiration;
6541         int err, i;
6542         u8 ulen;
6543
6544         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6545                                           nft_set_elem_policy, NULL);
6546         if (err < 0)
6547                 return err;
6548
6549         nft_set_ext_prepare(&tmpl);
6550
6551         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6552         if (err < 0)
6553                 return err;
6554
6555         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6556             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6557                 return -EINVAL;
6558
6559         if (flags != 0) {
6560                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6561                 if (err < 0)
6562                         return err;
6563         }
6564
6565         if (set->flags & NFT_SET_MAP) {
6566                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6567                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6568                         return -EINVAL;
6569         } else {
6570                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6571                         return -EINVAL;
6572         }
6573
6574         if (set->flags & NFT_SET_OBJECT) {
6575                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6576                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6577                         return -EINVAL;
6578         } else {
6579                 if (nla[NFTA_SET_ELEM_OBJREF])
6580                         return -EINVAL;
6581         }
6582
6583         if (!nft_setelem_valid_key_end(set, nla, flags))
6584                 return -EINVAL;
6585
6586         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6587              (nla[NFTA_SET_ELEM_DATA] ||
6588               nla[NFTA_SET_ELEM_OBJREF] ||
6589               nla[NFTA_SET_ELEM_TIMEOUT] ||
6590               nla[NFTA_SET_ELEM_EXPIRATION] ||
6591               nla[NFTA_SET_ELEM_USERDATA] ||
6592               nla[NFTA_SET_ELEM_EXPR] ||
6593               nla[NFTA_SET_ELEM_KEY_END] ||
6594               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6595                 return -EINVAL;
6596
6597         timeout = 0;
6598         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6599                 if (!(set->flags & NFT_SET_TIMEOUT))
6600                         return -EINVAL;
6601                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6602                                             &timeout);
6603                 if (err)
6604                         return err;
6605         } else if (set->flags & NFT_SET_TIMEOUT &&
6606                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6607                 timeout = READ_ONCE(set->timeout);
6608         }
6609
6610         expiration = 0;
6611         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6612                 if (!(set->flags & NFT_SET_TIMEOUT))
6613                         return -EINVAL;
6614                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6615                                             &expiration);
6616                 if (err)
6617                         return err;
6618         }
6619
6620         if (nla[NFTA_SET_ELEM_EXPR]) {
6621                 struct nft_expr *expr;
6622
6623                 if (set->num_exprs && set->num_exprs != 1)
6624                         return -EOPNOTSUPP;
6625
6626                 expr = nft_set_elem_expr_alloc(ctx, set,
6627                                                nla[NFTA_SET_ELEM_EXPR]);
6628                 if (IS_ERR(expr))
6629                         return PTR_ERR(expr);
6630
6631                 expr_array[0] = expr;
6632                 num_exprs = 1;
6633
6634                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6635                         err = -EOPNOTSUPP;
6636                         goto err_set_elem_expr;
6637                 }
6638         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6639                 struct nft_expr *expr;
6640                 struct nlattr *tmp;
6641                 int left;
6642
6643                 i = 0;
6644                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6645                         if (i == NFT_SET_EXPR_MAX ||
6646                             (set->num_exprs && set->num_exprs == i)) {
6647                                 err = -E2BIG;
6648                                 goto err_set_elem_expr;
6649                         }
6650                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6651                                 err = -EINVAL;
6652                                 goto err_set_elem_expr;
6653                         }
6654                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6655                         if (IS_ERR(expr)) {
6656                                 err = PTR_ERR(expr);
6657                                 goto err_set_elem_expr;
6658                         }
6659                         expr_array[i] = expr;
6660                         num_exprs++;
6661
6662                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6663                                 err = -EOPNOTSUPP;
6664                                 goto err_set_elem_expr;
6665                         }
6666                         i++;
6667                 }
6668                 if (set->num_exprs && set->num_exprs != i) {
6669                         err = -EOPNOTSUPP;
6670                         goto err_set_elem_expr;
6671                 }
6672         } else if (set->num_exprs > 0 &&
6673                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6674                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6675                 if (err < 0)
6676                         goto err_set_elem_expr_clone;
6677
6678                 num_exprs = set->num_exprs;
6679         }
6680
6681         if (nla[NFTA_SET_ELEM_KEY]) {
6682                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6683                                             nla[NFTA_SET_ELEM_KEY]);
6684                 if (err < 0)
6685                         goto err_set_elem_expr;
6686
6687                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6688                 if (err < 0)
6689                         goto err_parse_key;
6690         }
6691
6692         if (nla[NFTA_SET_ELEM_KEY_END]) {
6693                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6694                                             nla[NFTA_SET_ELEM_KEY_END]);
6695                 if (err < 0)
6696                         goto err_parse_key;
6697
6698                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6699                 if (err < 0)
6700                         goto err_parse_key_end;
6701         }
6702
6703         if (timeout > 0) {
6704                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6705                 if (err < 0)
6706                         goto err_parse_key_end;
6707
6708                 if (timeout != READ_ONCE(set->timeout)) {
6709                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6710                         if (err < 0)
6711                                 goto err_parse_key_end;
6712                 }
6713         }
6714
6715         if (num_exprs) {
6716                 for (i = 0; i < num_exprs; i++)
6717                         size += expr_array[i]->ops->size;
6718
6719                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6720                                              sizeof(struct nft_set_elem_expr) + size);
6721                 if (err < 0)
6722                         goto err_parse_key_end;
6723         }
6724
6725         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6726                 obj = nft_obj_lookup(ctx->net, ctx->table,
6727                                      nla[NFTA_SET_ELEM_OBJREF],
6728                                      set->objtype, genmask);
6729                 if (IS_ERR(obj)) {
6730                         err = PTR_ERR(obj);
6731                         obj = NULL;
6732                         goto err_parse_key_end;
6733                 }
6734
6735                 if (!nft_use_inc(&obj->use)) {
6736                         err = -EMFILE;
6737                         obj = NULL;
6738                         goto err_parse_key_end;
6739                 }
6740
6741                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6742                 if (err < 0)
6743                         goto err_parse_key_end;
6744         }
6745
6746         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6747                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6748                                              nla[NFTA_SET_ELEM_DATA]);
6749                 if (err < 0)
6750                         goto err_parse_key_end;
6751
6752                 dreg = nft_type_to_reg(set->dtype);
6753                 list_for_each_entry(binding, &set->bindings, list) {
6754                         struct nft_ctx bind_ctx = {
6755                                 .net    = ctx->net,
6756                                 .family = ctx->family,
6757                                 .table  = ctx->table,
6758                                 .chain  = (struct nft_chain *)binding->chain,
6759                         };
6760
6761                         if (!(binding->flags & NFT_SET_MAP))
6762                                 continue;
6763
6764                         err = nft_validate_register_store(&bind_ctx, dreg,
6765                                                           &elem.data.val,
6766                                                           desc.type, desc.len);
6767                         if (err < 0)
6768                                 goto err_parse_data;
6769
6770                         if (desc.type == NFT_DATA_VERDICT &&
6771                             (elem.data.val.verdict.code == NFT_GOTO ||
6772                              elem.data.val.verdict.code == NFT_JUMP))
6773                                 nft_validate_state_update(ctx->table,
6774                                                           NFT_VALIDATE_NEED);
6775                 }
6776
6777                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6778                 if (err < 0)
6779                         goto err_parse_data;
6780         }
6781
6782         /* The full maximum length of userdata can exceed the maximum
6783          * offset value (U8_MAX) for following extensions, therefor it
6784          * must be the last extension added.
6785          */
6786         ulen = 0;
6787         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6788                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6789                 if (ulen > 0) {
6790                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6791                                                      ulen);
6792                         if (err < 0)
6793                                 goto err_parse_data;
6794                 }
6795         }
6796
6797         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6798                                       elem.key_end.val.data, elem.data.val.data,
6799                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6800         if (IS_ERR(elem.priv)) {
6801                 err = PTR_ERR(elem.priv);
6802                 goto err_parse_data;
6803         }
6804
6805         ext = nft_set_elem_ext(set, elem.priv);
6806         if (flags)
6807                 *nft_set_ext_flags(ext) = flags;
6808
6809         if (obj)
6810                 *nft_set_ext_obj(ext) = obj;
6811
6812         if (ulen > 0) {
6813                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6814                         err = -EINVAL;
6815                         goto err_elem_free;
6816                 }
6817                 udata = nft_set_ext_userdata(ext);
6818                 udata->len = ulen - 1;
6819                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6820         }
6821         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6822         if (err < 0)
6823                 goto err_elem_free;
6824
6825         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6826         if (trans == NULL) {
6827                 err = -ENOMEM;
6828                 goto err_elem_free;
6829         }
6830
6831         ext->genmask = nft_genmask_cur(ctx->net);
6832
6833         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6834         if (err) {
6835                 if (err == -EEXIST) {
6836                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6837                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6838                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6839                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6840                                 goto err_element_clash;
6841                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6842                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6843                              memcmp(nft_set_ext_data(ext),
6844                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6845                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6846                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6847                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6848                                 goto err_element_clash;
6849                         else if (!(nlmsg_flags & NLM_F_EXCL))
6850                                 err = 0;
6851                 } else if (err == -ENOTEMPTY) {
6852                         /* ENOTEMPTY reports overlapping between this element
6853                          * and an existing one.
6854                          */
6855                         err = -EEXIST;
6856                 }
6857                 goto err_element_clash;
6858         }
6859
6860         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6861                 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6862
6863                 if (!atomic_add_unless(&set->nelems, 1, max)) {
6864                         err = -ENFILE;
6865                         goto err_set_full;
6866                 }
6867         }
6868
6869         nft_trans_elem(trans) = elem;
6870         nft_trans_commit_list_add_tail(ctx->net, trans);
6871         return 0;
6872
6873 err_set_full:
6874         nft_setelem_remove(ctx->net, set, &elem);
6875 err_element_clash:
6876         kfree(trans);
6877 err_elem_free:
6878         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6879 err_parse_data:
6880         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6881                 nft_data_release(&elem.data.val, desc.type);
6882 err_parse_key_end:
6883         if (obj)
6884                 nft_use_dec_restore(&obj->use);
6885
6886         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6887 err_parse_key:
6888         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6889 err_set_elem_expr:
6890         for (i = 0; i < num_exprs && expr_array[i]; i++)
6891                 nft_expr_destroy(ctx, expr_array[i]);
6892 err_set_elem_expr_clone:
6893         return err;
6894 }
6895
6896 static int nf_tables_newsetelem(struct sk_buff *skb,
6897                                 const struct nfnl_info *info,
6898                                 const struct nlattr * const nla[])
6899 {
6900         struct netlink_ext_ack *extack = info->extack;
6901         u8 genmask = nft_genmask_next(info->net);
6902         u8 family = info->nfmsg->nfgen_family;
6903         struct net *net = info->net;
6904         const struct nlattr *attr;
6905         struct nft_table *table;
6906         struct nft_set *set;
6907         struct nft_ctx ctx;
6908         int rem, err;
6909
6910         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6911                 return -EINVAL;
6912
6913         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6914                                  genmask, NETLINK_CB(skb).portid);
6915         if (IS_ERR(table)) {
6916                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6917                 return PTR_ERR(table);
6918         }
6919
6920         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6921                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6922         if (IS_ERR(set))
6923                 return PTR_ERR(set);
6924
6925         if (!list_empty(&set->bindings) &&
6926             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6927                 return -EBUSY;
6928
6929         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6930
6931         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6932                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6933                 if (err < 0) {
6934                         NL_SET_BAD_ATTR(extack, attr);
6935                         return err;
6936                 }
6937         }
6938
6939         if (table->validate_state == NFT_VALIDATE_DO)
6940                 return nft_table_validate(net, table);
6941
6942         return 0;
6943 }
6944
6945 /**
6946  *      nft_data_hold - hold a nft_data item
6947  *
6948  *      @data: struct nft_data to release
6949  *      @type: type of data
6950  *
6951  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6952  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6953  *      NFT_GOTO verdicts. This function must be called on active data objects
6954  *      from the second phase of the commit protocol.
6955  */
6956 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6957 {
6958         struct nft_chain *chain;
6959
6960         if (type == NFT_DATA_VERDICT) {
6961                 switch (data->verdict.code) {
6962                 case NFT_JUMP:
6963                 case NFT_GOTO:
6964                         chain = data->verdict.chain;
6965                         nft_use_inc_restore(&chain->use);
6966                         break;
6967                 }
6968         }
6969 }
6970
6971 static void nft_setelem_data_activate(const struct net *net,
6972                                       const struct nft_set *set,
6973                                       struct nft_set_elem *elem)
6974 {
6975         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6976
6977         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6978                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6979         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6980                 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
6981 }
6982
6983 void nft_setelem_data_deactivate(const struct net *net,
6984                                  const struct nft_set *set,
6985                                  struct nft_set_elem *elem)
6986 {
6987         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6988
6989         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6990                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6991         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6992                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6993 }
6994
6995 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6996                            const struct nlattr *attr)
6997 {
6998         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6999         struct nft_set_ext_tmpl tmpl;
7000         struct nft_set_elem elem;
7001         struct nft_set_ext *ext;
7002         struct nft_trans *trans;
7003         u32 flags = 0;
7004         int err;
7005
7006         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7007                                           nft_set_elem_policy, NULL);
7008         if (err < 0)
7009                 return err;
7010
7011         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7012         if (err < 0)
7013                 return err;
7014
7015         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7016                 return -EINVAL;
7017
7018         if (!nft_setelem_valid_key_end(set, nla, flags))
7019                 return -EINVAL;
7020
7021         nft_set_ext_prepare(&tmpl);
7022
7023         if (flags != 0) {
7024                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7025                 if (err < 0)
7026                         return err;
7027         }
7028
7029         if (nla[NFTA_SET_ELEM_KEY]) {
7030                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7031                                             nla[NFTA_SET_ELEM_KEY]);
7032                 if (err < 0)
7033                         return err;
7034
7035                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7036                 if (err < 0)
7037                         goto fail_elem;
7038         }
7039
7040         if (nla[NFTA_SET_ELEM_KEY_END]) {
7041                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7042                                             nla[NFTA_SET_ELEM_KEY_END]);
7043                 if (err < 0)
7044                         goto fail_elem;
7045
7046                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7047                 if (err < 0)
7048                         goto fail_elem_key_end;
7049         }
7050
7051         err = -ENOMEM;
7052         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7053                                       elem.key_end.val.data, NULL, 0, 0,
7054                                       GFP_KERNEL_ACCOUNT);
7055         if (IS_ERR(elem.priv)) {
7056                 err = PTR_ERR(elem.priv);
7057                 goto fail_elem_key_end;
7058         }
7059
7060         ext = nft_set_elem_ext(set, elem.priv);
7061         if (flags)
7062                 *nft_set_ext_flags(ext) = flags;
7063
7064         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7065         if (trans == NULL)
7066                 goto fail_trans;
7067
7068         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7069         if (err < 0)
7070                 goto fail_ops;
7071
7072         nft_setelem_data_deactivate(ctx->net, set, &elem);
7073
7074         nft_trans_elem(trans) = elem;
7075         nft_trans_commit_list_add_tail(ctx->net, trans);
7076         return 0;
7077
7078 fail_ops:
7079         kfree(trans);
7080 fail_trans:
7081         kfree(elem.priv);
7082 fail_elem_key_end:
7083         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7084 fail_elem:
7085         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7086         return err;
7087 }
7088
7089 static int nft_setelem_flush(const struct nft_ctx *ctx,
7090                              struct nft_set *set,
7091                              const struct nft_set_iter *iter,
7092                              struct nft_set_elem *elem)
7093 {
7094         struct nft_trans *trans;
7095         int err;
7096
7097         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7098                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
7099         if (!trans)
7100                 return -ENOMEM;
7101
7102         if (!set->ops->flush(ctx->net, set, elem->priv)) {
7103                 err = -ENOENT;
7104                 goto err1;
7105         }
7106         set->ndeact++;
7107
7108         nft_setelem_data_deactivate(ctx->net, set, elem);
7109         nft_trans_elem_set(trans) = set;
7110         nft_trans_elem(trans) = *elem;
7111         nft_trans_commit_list_add_tail(ctx->net, trans);
7112
7113         return 0;
7114 err1:
7115         kfree(trans);
7116         return err;
7117 }
7118
7119 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7120                                     struct nft_set *set,
7121                                     struct nft_set_elem *elem)
7122 {
7123         struct nft_trans *trans;
7124
7125         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7126                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
7127         if (!trans)
7128                 return -ENOMEM;
7129
7130         nft_setelem_data_deactivate(ctx->net, set, elem);
7131         nft_trans_elem_set(trans) = set;
7132         nft_trans_elem(trans) = *elem;
7133         nft_trans_commit_list_add_tail(ctx->net, trans);
7134
7135         return 0;
7136 }
7137
7138 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7139                                   struct nft_set *set)
7140 {
7141         u8 genmask = nft_genmask_next(ctx->net);
7142         struct nft_set_elem_catchall *catchall;
7143         struct nft_set_elem elem;
7144         struct nft_set_ext *ext;
7145         int ret = 0;
7146
7147         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7148                 ext = nft_set_elem_ext(set, catchall->elem);
7149                 if (!nft_set_elem_active(ext, genmask))
7150                         continue;
7151
7152                 elem.priv = catchall->elem;
7153                 ret = __nft_set_catchall_flush(ctx, set, &elem);
7154                 if (ret < 0)
7155                         break;
7156                 nft_set_elem_change_active(ctx->net, set, ext);
7157         }
7158
7159         return ret;
7160 }
7161
7162 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7163 {
7164         struct nft_set_iter iter = {
7165                 .genmask        = genmask,
7166                 .fn             = nft_setelem_flush,
7167         };
7168
7169         set->ops->walk(ctx, set, &iter);
7170         if (!iter.err)
7171                 iter.err = nft_set_catchall_flush(ctx, set);
7172
7173         return iter.err;
7174 }
7175
7176 static int nf_tables_delsetelem(struct sk_buff *skb,
7177                                 const struct nfnl_info *info,
7178                                 const struct nlattr * const nla[])
7179 {
7180         struct netlink_ext_ack *extack = info->extack;
7181         u8 genmask = nft_genmask_next(info->net);
7182         u8 family = info->nfmsg->nfgen_family;
7183         struct net *net = info->net;
7184         const struct nlattr *attr;
7185         struct nft_table *table;
7186         struct nft_set *set;
7187         struct nft_ctx ctx;
7188         int rem, err = 0;
7189
7190         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7191                                  genmask, NETLINK_CB(skb).portid);
7192         if (IS_ERR(table)) {
7193                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7194                 return PTR_ERR(table);
7195         }
7196
7197         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7198         if (IS_ERR(set))
7199                 return PTR_ERR(set);
7200
7201         if (nft_set_is_anonymous(set))
7202                 return -EOPNOTSUPP;
7203
7204         if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7205                 return -EBUSY;
7206
7207         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7208
7209         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7210                 return nft_set_flush(&ctx, set, genmask);
7211
7212         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7213                 err = nft_del_setelem(&ctx, set, attr);
7214                 if (err == -ENOENT &&
7215                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7216                         continue;
7217
7218                 if (err < 0) {
7219                         NL_SET_BAD_ATTR(extack, attr);
7220                         break;
7221                 }
7222         }
7223         return err;
7224 }
7225
7226 /*
7227  * Stateful objects
7228  */
7229
7230 /**
7231  *      nft_register_obj- register nf_tables stateful object type
7232  *      @obj_type: object type
7233  *
7234  *      Registers the object type for use with nf_tables. Returns zero on
7235  *      success or a negative errno code otherwise.
7236  */
7237 int nft_register_obj(struct nft_object_type *obj_type)
7238 {
7239         if (obj_type->type == NFT_OBJECT_UNSPEC)
7240                 return -EINVAL;
7241
7242         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7243         list_add_rcu(&obj_type->list, &nf_tables_objects);
7244         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7245         return 0;
7246 }
7247 EXPORT_SYMBOL_GPL(nft_register_obj);
7248
7249 /**
7250  *      nft_unregister_obj - unregister nf_tables object type
7251  *      @obj_type: object type
7252  *
7253  *      Unregisters the object type for use with nf_tables.
7254  */
7255 void nft_unregister_obj(struct nft_object_type *obj_type)
7256 {
7257         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7258         list_del_rcu(&obj_type->list);
7259         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7260 }
7261 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7262
7263 struct nft_object *nft_obj_lookup(const struct net *net,
7264                                   const struct nft_table *table,
7265                                   const struct nlattr *nla, u32 objtype,
7266                                   u8 genmask)
7267 {
7268         struct nft_object_hash_key k = { .table = table };
7269         char search[NFT_OBJ_MAXNAMELEN];
7270         struct rhlist_head *tmp, *list;
7271         struct nft_object *obj;
7272
7273         nla_strscpy(search, nla, sizeof(search));
7274         k.name = search;
7275
7276         WARN_ON_ONCE(!rcu_read_lock_held() &&
7277                      !lockdep_commit_lock_is_held(net));
7278
7279         rcu_read_lock();
7280         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7281         if (!list)
7282                 goto out;
7283
7284         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7285                 if (objtype == obj->ops->type->type &&
7286                     nft_active_genmask(obj, genmask)) {
7287                         rcu_read_unlock();
7288                         return obj;
7289                 }
7290         }
7291 out:
7292         rcu_read_unlock();
7293         return ERR_PTR(-ENOENT);
7294 }
7295 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7296
7297 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7298                                                   const struct nlattr *nla,
7299                                                   u32 objtype, u8 genmask)
7300 {
7301         struct nft_object *obj;
7302
7303         list_for_each_entry(obj, &table->objects, list) {
7304                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7305                     objtype == obj->ops->type->type &&
7306                     nft_active_genmask(obj, genmask))
7307                         return obj;
7308         }
7309         return ERR_PTR(-ENOENT);
7310 }
7311
7312 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7313         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7314                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7315         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7316                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7317         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7318         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7319         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7320         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7321                                     .len = NFT_USERDATA_MAXLEN },
7322 };
7323
7324 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7325                                        const struct nft_object_type *type,
7326                                        const struct nlattr *attr)
7327 {
7328         struct nlattr **tb;
7329         const struct nft_object_ops *ops;
7330         struct nft_object *obj;
7331         int err = -ENOMEM;
7332
7333         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7334         if (!tb)
7335                 goto err1;
7336
7337         if (attr) {
7338                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7339                                                   type->policy, NULL);
7340                 if (err < 0)
7341                         goto err2;
7342         } else {
7343                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7344         }
7345
7346         if (type->select_ops) {
7347                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7348                 if (IS_ERR(ops)) {
7349                         err = PTR_ERR(ops);
7350                         goto err2;
7351                 }
7352         } else {
7353                 ops = type->ops;
7354         }
7355
7356         err = -ENOMEM;
7357         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7358         if (!obj)
7359                 goto err2;
7360
7361         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7362         if (err < 0)
7363                 goto err3;
7364
7365         obj->ops = ops;
7366
7367         kfree(tb);
7368         return obj;
7369 err3:
7370         kfree(obj);
7371 err2:
7372         kfree(tb);
7373 err1:
7374         return ERR_PTR(err);
7375 }
7376
7377 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7378                            struct nft_object *obj, bool reset)
7379 {
7380         struct nlattr *nest;
7381
7382         nest = nla_nest_start_noflag(skb, attr);
7383         if (!nest)
7384                 goto nla_put_failure;
7385         if (obj->ops->dump(skb, obj, reset) < 0)
7386                 goto nla_put_failure;
7387         nla_nest_end(skb, nest);
7388         return 0;
7389
7390 nla_put_failure:
7391         return -1;
7392 }
7393
7394 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7395 {
7396         const struct nft_object_type *type;
7397
7398         list_for_each_entry(type, &nf_tables_objects, list) {
7399                 if (objtype == type->type)
7400                         return type;
7401         }
7402         return NULL;
7403 }
7404
7405 static const struct nft_object_type *
7406 nft_obj_type_get(struct net *net, u32 objtype)
7407 {
7408         const struct nft_object_type *type;
7409
7410         type = __nft_obj_type_get(objtype);
7411         if (type != NULL && try_module_get(type->owner))
7412                 return type;
7413
7414         lockdep_nfnl_nft_mutex_not_held();
7415 #ifdef CONFIG_MODULES
7416         if (type == NULL) {
7417                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7418                         return ERR_PTR(-EAGAIN);
7419         }
7420 #endif
7421         return ERR_PTR(-ENOENT);
7422 }
7423
7424 static int nf_tables_updobj(const struct nft_ctx *ctx,
7425                             const struct nft_object_type *type,
7426                             const struct nlattr *attr,
7427                             struct nft_object *obj)
7428 {
7429         struct nft_object *newobj;
7430         struct nft_trans *trans;
7431         int err = -ENOMEM;
7432
7433         if (!try_module_get(type->owner))
7434                 return -ENOENT;
7435
7436         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7437                                 sizeof(struct nft_trans_obj));
7438         if (!trans)
7439                 goto err_trans;
7440
7441         newobj = nft_obj_init(ctx, type, attr);
7442         if (IS_ERR(newobj)) {
7443                 err = PTR_ERR(newobj);
7444                 goto err_free_trans;
7445         }
7446
7447         nft_trans_obj(trans) = obj;
7448         nft_trans_obj_update(trans) = true;
7449         nft_trans_obj_newobj(trans) = newobj;
7450         nft_trans_commit_list_add_tail(ctx->net, trans);
7451
7452         return 0;
7453
7454 err_free_trans:
7455         kfree(trans);
7456 err_trans:
7457         module_put(type->owner);
7458         return err;
7459 }
7460
7461 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7462                             const struct nlattr * const nla[])
7463 {
7464         struct netlink_ext_ack *extack = info->extack;
7465         u8 genmask = nft_genmask_next(info->net);
7466         u8 family = info->nfmsg->nfgen_family;
7467         const struct nft_object_type *type;
7468         struct net *net = info->net;
7469         struct nft_table *table;
7470         struct nft_object *obj;
7471         struct nft_ctx ctx;
7472         u32 objtype;
7473         int err;
7474
7475         if (!nla[NFTA_OBJ_TYPE] ||
7476             !nla[NFTA_OBJ_NAME] ||
7477             !nla[NFTA_OBJ_DATA])
7478                 return -EINVAL;
7479
7480         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7481                                  NETLINK_CB(skb).portid);
7482         if (IS_ERR(table)) {
7483                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7484                 return PTR_ERR(table);
7485         }
7486
7487         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7488         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7489         if (IS_ERR(obj)) {
7490                 err = PTR_ERR(obj);
7491                 if (err != -ENOENT) {
7492                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7493                         return err;
7494                 }
7495         } else {
7496                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7497                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7498                         return -EEXIST;
7499                 }
7500                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7501                         return -EOPNOTSUPP;
7502
7503                 type = __nft_obj_type_get(objtype);
7504                 if (WARN_ON_ONCE(!type))
7505                         return -ENOENT;
7506
7507                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7508
7509                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7510         }
7511
7512         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7513
7514         if (!nft_use_inc(&table->use))
7515                 return -EMFILE;
7516
7517         type = nft_obj_type_get(net, objtype);
7518         if (IS_ERR(type)) {
7519                 err = PTR_ERR(type);
7520                 goto err_type;
7521         }
7522
7523         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7524         if (IS_ERR(obj)) {
7525                 err = PTR_ERR(obj);
7526                 goto err_init;
7527         }
7528         obj->key.table = table;
7529         obj->handle = nf_tables_alloc_handle(table);
7530
7531         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7532         if (!obj->key.name) {
7533                 err = -ENOMEM;
7534                 goto err_strdup;
7535         }
7536
7537         if (nla[NFTA_OBJ_USERDATA]) {
7538                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7539                 if (obj->udata == NULL)
7540                         goto err_userdata;
7541
7542                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7543         }
7544
7545         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7546         if (err < 0)
7547                 goto err_trans;
7548
7549         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7550                               nft_objname_ht_params);
7551         if (err < 0)
7552                 goto err_obj_ht;
7553
7554         list_add_tail_rcu(&obj->list, &table->objects);
7555
7556         return 0;
7557 err_obj_ht:
7558         /* queued in transaction log */
7559         INIT_LIST_HEAD(&obj->list);
7560         return err;
7561 err_trans:
7562         kfree(obj->udata);
7563 err_userdata:
7564         kfree(obj->key.name);
7565 err_strdup:
7566         if (obj->ops->destroy)
7567                 obj->ops->destroy(&ctx, obj);
7568         kfree(obj);
7569 err_init:
7570         module_put(type->owner);
7571 err_type:
7572         nft_use_dec_restore(&table->use);
7573
7574         return err;
7575 }
7576
7577 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7578                                    u32 portid, u32 seq, int event, u32 flags,
7579                                    int family, const struct nft_table *table,
7580                                    struct nft_object *obj, bool reset)
7581 {
7582         struct nlmsghdr *nlh;
7583
7584         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7585         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7586                            NFNETLINK_V0, nft_base_seq(net));
7587         if (!nlh)
7588                 goto nla_put_failure;
7589
7590         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7591             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7592             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7593                          NFTA_OBJ_PAD))
7594                 goto nla_put_failure;
7595
7596         if (event == NFT_MSG_DELOBJ) {
7597                 nlmsg_end(skb, nlh);
7598                 return 0;
7599         }
7600
7601         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7602             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7603             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7604                 goto nla_put_failure;
7605
7606         if (obj->udata &&
7607             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7608                 goto nla_put_failure;
7609
7610         nlmsg_end(skb, nlh);
7611         return 0;
7612
7613 nla_put_failure:
7614         nlmsg_trim(skb, nlh);
7615         return -1;
7616 }
7617
7618 struct nft_obj_filter {
7619         char            *table;
7620         u32             type;
7621 };
7622
7623 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7624 {
7625         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7626         const struct nft_table *table;
7627         unsigned int idx = 0, s_idx = cb->args[0];
7628         struct nft_obj_filter *filter = cb->data;
7629         struct net *net = sock_net(skb->sk);
7630         int family = nfmsg->nfgen_family;
7631         struct nftables_pernet *nft_net;
7632         struct nft_object *obj;
7633         bool reset = false;
7634
7635         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7636                 reset = true;
7637
7638         rcu_read_lock();
7639         nft_net = nft_pernet(net);
7640         cb->seq = READ_ONCE(nft_net->base_seq);
7641
7642         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7643                 if (family != NFPROTO_UNSPEC && family != table->family)
7644                         continue;
7645
7646                 list_for_each_entry_rcu(obj, &table->objects, list) {
7647                         if (!nft_is_active(net, obj))
7648                                 goto cont;
7649                         if (idx < s_idx)
7650                                 goto cont;
7651                         if (idx > s_idx)
7652                                 memset(&cb->args[1], 0,
7653                                        sizeof(cb->args) - sizeof(cb->args[0]));
7654                         if (filter && filter->table &&
7655                             strcmp(filter->table, table->name))
7656                                 goto cont;
7657                         if (filter &&
7658                             filter->type != NFT_OBJECT_UNSPEC &&
7659                             obj->ops->type->type != filter->type)
7660                                 goto cont;
7661                         if (reset) {
7662                                 char *buf = kasprintf(GFP_ATOMIC,
7663                                                       "%s:%u",
7664                                                       table->name,
7665                                                       nft_net->base_seq);
7666
7667                                 audit_log_nfcfg(buf,
7668                                                 family,
7669                                                 obj->handle,
7670                                                 AUDIT_NFT_OP_OBJ_RESET,
7671                                                 GFP_ATOMIC);
7672                                 kfree(buf);
7673                         }
7674
7675                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7676                                                     cb->nlh->nlmsg_seq,
7677                                                     NFT_MSG_NEWOBJ,
7678                                                     NLM_F_MULTI | NLM_F_APPEND,
7679                                                     table->family, table,
7680                                                     obj, reset) < 0)
7681                                 goto done;
7682
7683                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7684 cont:
7685                         idx++;
7686                 }
7687         }
7688 done:
7689         rcu_read_unlock();
7690
7691         cb->args[0] = idx;
7692         return skb->len;
7693 }
7694
7695 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7696 {
7697         const struct nlattr * const *nla = cb->data;
7698         struct nft_obj_filter *filter = NULL;
7699
7700         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7701                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7702                 if (!filter)
7703                         return -ENOMEM;
7704
7705                 if (nla[NFTA_OBJ_TABLE]) {
7706                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7707                         if (!filter->table) {
7708                                 kfree(filter);
7709                                 return -ENOMEM;
7710                         }
7711                 }
7712
7713                 if (nla[NFTA_OBJ_TYPE])
7714                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7715         }
7716
7717         cb->data = filter;
7718         return 0;
7719 }
7720
7721 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7722 {
7723         struct nft_obj_filter *filter = cb->data;
7724
7725         if (filter) {
7726                 kfree(filter->table);
7727                 kfree(filter);
7728         }
7729
7730         return 0;
7731 }
7732
7733 /* called with rcu_read_lock held */
7734 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7735                             const struct nlattr * const nla[])
7736 {
7737         struct netlink_ext_ack *extack = info->extack;
7738         u8 genmask = nft_genmask_cur(info->net);
7739         u8 family = info->nfmsg->nfgen_family;
7740         const struct nft_table *table;
7741         struct net *net = info->net;
7742         struct nft_object *obj;
7743         struct sk_buff *skb2;
7744         bool reset = false;
7745         u32 objtype;
7746         int err;
7747
7748         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7749                 struct netlink_dump_control c = {
7750                         .start = nf_tables_dump_obj_start,
7751                         .dump = nf_tables_dump_obj,
7752                         .done = nf_tables_dump_obj_done,
7753                         .module = THIS_MODULE,
7754                         .data = (void *)nla,
7755                 };
7756
7757                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7758         }
7759
7760         if (!nla[NFTA_OBJ_NAME] ||
7761             !nla[NFTA_OBJ_TYPE])
7762                 return -EINVAL;
7763
7764         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7765         if (IS_ERR(table)) {
7766                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7767                 return PTR_ERR(table);
7768         }
7769
7770         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7771         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7772         if (IS_ERR(obj)) {
7773                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7774                 return PTR_ERR(obj);
7775         }
7776
7777         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7778         if (!skb2)
7779                 return -ENOMEM;
7780
7781         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7782                 reset = true;
7783
7784         if (reset) {
7785                 const struct nftables_pernet *nft_net;
7786                 char *buf;
7787
7788                 nft_net = nft_pernet(net);
7789                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7790
7791                 audit_log_nfcfg(buf,
7792                                 family,
7793                                 obj->handle,
7794                                 AUDIT_NFT_OP_OBJ_RESET,
7795                                 GFP_ATOMIC);
7796                 kfree(buf);
7797         }
7798
7799         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7800                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7801                                       family, table, obj, reset);
7802         if (err < 0)
7803                 goto err_fill_obj_info;
7804
7805         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7806
7807 err_fill_obj_info:
7808         kfree_skb(skb2);
7809         return err;
7810 }
7811
7812 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7813 {
7814         if (obj->ops->destroy)
7815                 obj->ops->destroy(ctx, obj);
7816
7817         module_put(obj->ops->type->owner);
7818         kfree(obj->key.name);
7819         kfree(obj->udata);
7820         kfree(obj);
7821 }
7822
7823 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7824                             const struct nlattr * const nla[])
7825 {
7826         struct netlink_ext_ack *extack = info->extack;
7827         u8 genmask = nft_genmask_next(info->net);
7828         u8 family = info->nfmsg->nfgen_family;
7829         struct net *net = info->net;
7830         const struct nlattr *attr;
7831         struct nft_table *table;
7832         struct nft_object *obj;
7833         struct nft_ctx ctx;
7834         u32 objtype;
7835
7836         if (!nla[NFTA_OBJ_TYPE] ||
7837             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7838                 return -EINVAL;
7839
7840         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7841                                  NETLINK_CB(skb).portid);
7842         if (IS_ERR(table)) {
7843                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7844                 return PTR_ERR(table);
7845         }
7846
7847         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7848         if (nla[NFTA_OBJ_HANDLE]) {
7849                 attr = nla[NFTA_OBJ_HANDLE];
7850                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7851         } else {
7852                 attr = nla[NFTA_OBJ_NAME];
7853                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7854         }
7855
7856         if (IS_ERR(obj)) {
7857                 if (PTR_ERR(obj) == -ENOENT &&
7858                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7859                         return 0;
7860
7861                 NL_SET_BAD_ATTR(extack, attr);
7862                 return PTR_ERR(obj);
7863         }
7864         if (obj->use > 0) {
7865                 NL_SET_BAD_ATTR(extack, attr);
7866                 return -EBUSY;
7867         }
7868
7869         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7870
7871         return nft_delobj(&ctx, obj);
7872 }
7873
7874 static void
7875 __nft_obj_notify(struct net *net, const struct nft_table *table,
7876                  struct nft_object *obj, u32 portid, u32 seq, int event,
7877                  u16 flags, int family, int report, gfp_t gfp)
7878 {
7879         struct nftables_pernet *nft_net = nft_pernet(net);
7880         struct sk_buff *skb;
7881         int err;
7882
7883         if (!report &&
7884             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7885                 return;
7886
7887         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7888         if (skb == NULL)
7889                 goto err;
7890
7891         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7892                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7893                                       family, table, obj, false);
7894         if (err < 0) {
7895                 kfree_skb(skb);
7896                 goto err;
7897         }
7898
7899         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7900         return;
7901 err:
7902         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7903 }
7904
7905 void nft_obj_notify(struct net *net, const struct nft_table *table,
7906                     struct nft_object *obj, u32 portid, u32 seq, int event,
7907                     u16 flags, int family, int report, gfp_t gfp)
7908 {
7909         struct nftables_pernet *nft_net = nft_pernet(net);
7910         char *buf = kasprintf(gfp, "%s:%u",
7911                               table->name, nft_net->base_seq);
7912
7913         audit_log_nfcfg(buf,
7914                         family,
7915                         obj->handle,
7916                         event == NFT_MSG_NEWOBJ ?
7917                                  AUDIT_NFT_OP_OBJ_REGISTER :
7918                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7919                         gfp);
7920         kfree(buf);
7921
7922         __nft_obj_notify(net, table, obj, portid, seq, event,
7923                          flags, family, report, gfp);
7924 }
7925 EXPORT_SYMBOL_GPL(nft_obj_notify);
7926
7927 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7928                                  struct nft_object *obj, int event)
7929 {
7930         __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
7931                          ctx->seq, event, ctx->flags, ctx->family,
7932                          ctx->report, GFP_KERNEL);
7933 }
7934
7935 /*
7936  * Flow tables
7937  */
7938 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7939 {
7940         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7941         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7942         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7943 }
7944 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7945
7946 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7947 {
7948         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7949         list_del_rcu(&type->list);
7950         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7951 }
7952 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7953
7954 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7955         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7956                                             .len = NFT_NAME_MAXLEN - 1 },
7957         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7958                                             .len = NFT_NAME_MAXLEN - 1 },
7959         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7960         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7961         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7962 };
7963
7964 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7965                                            const struct nlattr *nla, u8 genmask)
7966 {
7967         struct nft_flowtable *flowtable;
7968
7969         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7970                 if (!nla_strcmp(nla, flowtable->name) &&
7971                     nft_active_genmask(flowtable, genmask))
7972                         return flowtable;
7973         }
7974         return ERR_PTR(-ENOENT);
7975 }
7976 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7977
7978 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7979                                     struct nft_flowtable *flowtable,
7980                                     enum nft_trans_phase phase)
7981 {
7982         switch (phase) {
7983         case NFT_TRANS_PREPARE_ERROR:
7984         case NFT_TRANS_PREPARE:
7985         case NFT_TRANS_ABORT:
7986         case NFT_TRANS_RELEASE:
7987                 nft_use_dec(&flowtable->use);
7988                 fallthrough;
7989         default:
7990                 return;
7991         }
7992 }
7993 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7994
7995 static struct nft_flowtable *
7996 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7997                               const struct nlattr *nla, u8 genmask)
7998 {
7999        struct nft_flowtable *flowtable;
8000
8001        list_for_each_entry(flowtable, &table->flowtables, list) {
8002                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8003                    nft_active_genmask(flowtable, genmask))
8004                        return flowtable;
8005        }
8006        return ERR_PTR(-ENOENT);
8007 }
8008
8009 struct nft_flowtable_hook {
8010         u32                     num;
8011         int                     priority;
8012         struct list_head        list;
8013 };
8014
8015 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8016         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
8017         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
8018         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
8019 };
8020
8021 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8022                                     const struct nlattr * const nla[],
8023                                     struct nft_flowtable_hook *flowtable_hook,
8024                                     struct nft_flowtable *flowtable,
8025                                     struct netlink_ext_ack *extack, bool add)
8026 {
8027         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8028         struct nft_hook *hook;
8029         int hooknum, priority;
8030         int err;
8031
8032         INIT_LIST_HEAD(&flowtable_hook->list);
8033
8034         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8035                                           nla[NFTA_FLOWTABLE_HOOK],
8036                                           nft_flowtable_hook_policy, NULL);
8037         if (err < 0)
8038                 return err;
8039
8040         if (add) {
8041                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8042                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8043                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8044                         return -ENOENT;
8045                 }
8046
8047                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8048                 if (hooknum != NF_NETDEV_INGRESS)
8049                         return -EOPNOTSUPP;
8050
8051                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8052
8053                 flowtable_hook->priority        = priority;
8054                 flowtable_hook->num             = hooknum;
8055         } else {
8056                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8057                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8058                         if (hooknum != flowtable->hooknum)
8059                                 return -EOPNOTSUPP;
8060                 }
8061
8062                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8063                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8064                         if (priority != flowtable->data.priority)
8065                                 return -EOPNOTSUPP;
8066                 }
8067
8068                 flowtable_hook->priority        = flowtable->data.priority;
8069                 flowtable_hook->num             = flowtable->hooknum;
8070         }
8071
8072         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8073                 err = nf_tables_parse_netdev_hooks(ctx->net,
8074                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
8075                                                    &flowtable_hook->list,
8076                                                    extack);
8077                 if (err < 0)
8078                         return err;
8079         }
8080
8081         list_for_each_entry(hook, &flowtable_hook->list, list) {
8082                 hook->ops.pf            = NFPROTO_NETDEV;
8083                 hook->ops.hooknum       = flowtable_hook->num;
8084                 hook->ops.priority      = flowtable_hook->priority;
8085                 hook->ops.priv          = &flowtable->data;
8086                 hook->ops.hook          = flowtable->data.type->hook;
8087         }
8088
8089         return err;
8090 }
8091
8092 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8093 {
8094         const struct nf_flowtable_type *type;
8095
8096         list_for_each_entry(type, &nf_tables_flowtables, list) {
8097                 if (family == type->family)
8098                         return type;
8099         }
8100         return NULL;
8101 }
8102
8103 static const struct nf_flowtable_type *
8104 nft_flowtable_type_get(struct net *net, u8 family)
8105 {
8106         const struct nf_flowtable_type *type;
8107
8108         type = __nft_flowtable_type_get(family);
8109         if (type != NULL && try_module_get(type->owner))
8110                 return type;
8111
8112         lockdep_nfnl_nft_mutex_not_held();
8113 #ifdef CONFIG_MODULES
8114         if (type == NULL) {
8115                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8116                         return ERR_PTR(-EAGAIN);
8117         }
8118 #endif
8119         return ERR_PTR(-ENOENT);
8120 }
8121
8122 /* Only called from error and netdev event paths. */
8123 static void nft_unregister_flowtable_hook(struct net *net,
8124                                           struct nft_flowtable *flowtable,
8125                                           struct nft_hook *hook)
8126 {
8127         nf_unregister_net_hook(net, &hook->ops);
8128         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8129                                     FLOW_BLOCK_UNBIND);
8130 }
8131
8132 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8133                                                  struct list_head *hook_list,
8134                                                  bool release_netdev)
8135 {
8136         struct nft_hook *hook, *next;
8137
8138         list_for_each_entry_safe(hook, next, hook_list, list) {
8139                 nf_unregister_net_hook(net, &hook->ops);
8140                 if (release_netdev) {
8141                         list_del(&hook->list);
8142                         kfree_rcu(hook, rcu);
8143                 }
8144         }
8145 }
8146
8147 static void nft_unregister_flowtable_net_hooks(struct net *net,
8148                                                struct list_head *hook_list)
8149 {
8150         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8151 }
8152
8153 static int nft_register_flowtable_net_hooks(struct net *net,
8154                                             struct nft_table *table,
8155                                             struct list_head *hook_list,
8156                                             struct nft_flowtable *flowtable)
8157 {
8158         struct nft_hook *hook, *hook2, *next;
8159         struct nft_flowtable *ft;
8160         int err, i = 0;
8161
8162         list_for_each_entry(hook, hook_list, list) {
8163                 list_for_each_entry(ft, &table->flowtables, list) {
8164                         if (!nft_is_active_next(net, ft))
8165                                 continue;
8166
8167                         list_for_each_entry(hook2, &ft->hook_list, list) {
8168                                 if (hook->ops.dev == hook2->ops.dev &&
8169                                     hook->ops.pf == hook2->ops.pf) {
8170                                         err = -EEXIST;
8171                                         goto err_unregister_net_hooks;
8172                                 }
8173                         }
8174                 }
8175
8176                 err = flowtable->data.type->setup(&flowtable->data,
8177                                                   hook->ops.dev,
8178                                                   FLOW_BLOCK_BIND);
8179                 if (err < 0)
8180                         goto err_unregister_net_hooks;
8181
8182                 err = nf_register_net_hook(net, &hook->ops);
8183                 if (err < 0) {
8184                         flowtable->data.type->setup(&flowtable->data,
8185                                                     hook->ops.dev,
8186                                                     FLOW_BLOCK_UNBIND);
8187                         goto err_unregister_net_hooks;
8188                 }
8189
8190                 i++;
8191         }
8192
8193         return 0;
8194
8195 err_unregister_net_hooks:
8196         list_for_each_entry_safe(hook, next, hook_list, list) {
8197                 if (i-- <= 0)
8198                         break;
8199
8200                 nft_unregister_flowtable_hook(net, flowtable, hook);
8201                 list_del_rcu(&hook->list);
8202                 kfree_rcu(hook, rcu);
8203         }
8204
8205         return err;
8206 }
8207
8208 static void nft_hooks_destroy(struct list_head *hook_list)
8209 {
8210         struct nft_hook *hook, *next;
8211
8212         list_for_each_entry_safe(hook, next, hook_list, list) {
8213                 list_del_rcu(&hook->list);
8214                 kfree_rcu(hook, rcu);
8215         }
8216 }
8217
8218 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8219                                 struct nft_flowtable *flowtable,
8220                                 struct netlink_ext_ack *extack)
8221 {
8222         const struct nlattr * const *nla = ctx->nla;
8223         struct nft_flowtable_hook flowtable_hook;
8224         struct nft_hook *hook, *next;
8225         struct nft_trans *trans;
8226         bool unregister = false;
8227         u32 flags;
8228         int err;
8229
8230         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8231                                        extack, false);
8232         if (err < 0)
8233                 return err;
8234
8235         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8236                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8237                         list_del(&hook->list);
8238                         kfree(hook);
8239                 }
8240         }
8241
8242         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8243                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8244                 if (flags & ~NFT_FLOWTABLE_MASK) {
8245                         err = -EOPNOTSUPP;
8246                         goto err_flowtable_update_hook;
8247                 }
8248                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8249                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8250                         err = -EOPNOTSUPP;
8251                         goto err_flowtable_update_hook;
8252                 }
8253         } else {
8254                 flags = flowtable->data.flags;
8255         }
8256
8257         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8258                                                &flowtable_hook.list, flowtable);
8259         if (err < 0)
8260                 goto err_flowtable_update_hook;
8261
8262         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8263                                 sizeof(struct nft_trans_flowtable));
8264         if (!trans) {
8265                 unregister = true;
8266                 err = -ENOMEM;
8267                 goto err_flowtable_update_hook;
8268         }
8269
8270         nft_trans_flowtable_flags(trans) = flags;
8271         nft_trans_flowtable(trans) = flowtable;
8272         nft_trans_flowtable_update(trans) = true;
8273         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8274         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8275
8276         nft_trans_commit_list_add_tail(ctx->net, trans);
8277
8278         return 0;
8279
8280 err_flowtable_update_hook:
8281         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8282                 if (unregister)
8283                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8284                 list_del_rcu(&hook->list);
8285                 kfree_rcu(hook, rcu);
8286         }
8287
8288         return err;
8289
8290 }
8291
8292 static int nf_tables_newflowtable(struct sk_buff *skb,
8293                                   const struct nfnl_info *info,
8294                                   const struct nlattr * const nla[])
8295 {
8296         struct netlink_ext_ack *extack = info->extack;
8297         struct nft_flowtable_hook flowtable_hook;
8298         u8 genmask = nft_genmask_next(info->net);
8299         u8 family = info->nfmsg->nfgen_family;
8300         const struct nf_flowtable_type *type;
8301         struct nft_flowtable *flowtable;
8302         struct nft_hook *hook, *next;
8303         struct net *net = info->net;
8304         struct nft_table *table;
8305         struct nft_ctx ctx;
8306         int err;
8307
8308         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8309             !nla[NFTA_FLOWTABLE_NAME] ||
8310             !nla[NFTA_FLOWTABLE_HOOK])
8311                 return -EINVAL;
8312
8313         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8314                                  genmask, NETLINK_CB(skb).portid);
8315         if (IS_ERR(table)) {
8316                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8317                 return PTR_ERR(table);
8318         }
8319
8320         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8321                                          genmask);
8322         if (IS_ERR(flowtable)) {
8323                 err = PTR_ERR(flowtable);
8324                 if (err != -ENOENT) {
8325                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8326                         return err;
8327                 }
8328         } else {
8329                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8330                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8331                         return -EEXIST;
8332                 }
8333
8334                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8335
8336                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8337         }
8338
8339         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8340
8341         if (!nft_use_inc(&table->use))
8342                 return -EMFILE;
8343
8344         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8345         if (!flowtable) {
8346                 err = -ENOMEM;
8347                 goto flowtable_alloc;
8348         }
8349
8350         flowtable->table = table;
8351         flowtable->handle = nf_tables_alloc_handle(table);
8352         INIT_LIST_HEAD(&flowtable->hook_list);
8353
8354         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8355         if (!flowtable->name) {
8356                 err = -ENOMEM;
8357                 goto err1;
8358         }
8359
8360         type = nft_flowtable_type_get(net, family);
8361         if (IS_ERR(type)) {
8362                 err = PTR_ERR(type);
8363                 goto err2;
8364         }
8365
8366         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8367                 flowtable->data.flags =
8368                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8369                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8370                         err = -EOPNOTSUPP;
8371                         goto err3;
8372                 }
8373         }
8374
8375         write_pnet(&flowtable->data.net, net);
8376         flowtable->data.type = type;
8377         err = type->init(&flowtable->data);
8378         if (err < 0)
8379                 goto err3;
8380
8381         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8382                                        extack, true);
8383         if (err < 0)
8384                 goto err4;
8385
8386         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8387         flowtable->data.priority = flowtable_hook.priority;
8388         flowtable->hooknum = flowtable_hook.num;
8389
8390         err = nft_register_flowtable_net_hooks(ctx.net, table,
8391                                                &flowtable->hook_list,
8392                                                flowtable);
8393         if (err < 0) {
8394                 nft_hooks_destroy(&flowtable->hook_list);
8395                 goto err4;
8396         }
8397
8398         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8399         if (err < 0)
8400                 goto err5;
8401
8402         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8403
8404         return 0;
8405 err5:
8406         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8407                 nft_unregister_flowtable_hook(net, flowtable, hook);
8408                 list_del_rcu(&hook->list);
8409                 kfree_rcu(hook, rcu);
8410         }
8411 err4:
8412         flowtable->data.type->free(&flowtable->data);
8413 err3:
8414         module_put(type->owner);
8415 err2:
8416         kfree(flowtable->name);
8417 err1:
8418         kfree(flowtable);
8419 flowtable_alloc:
8420         nft_use_dec_restore(&table->use);
8421
8422         return err;
8423 }
8424
8425 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8426 {
8427         struct nft_hook *this, *next;
8428
8429         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8430                 list_del(&this->list);
8431                 kfree(this);
8432         }
8433 }
8434
8435 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8436                                  struct nft_flowtable *flowtable,
8437                                  struct netlink_ext_ack *extack)
8438 {
8439         const struct nlattr * const *nla = ctx->nla;
8440         struct nft_flowtable_hook flowtable_hook;
8441         LIST_HEAD(flowtable_del_list);
8442         struct nft_hook *this, *hook;
8443         struct nft_trans *trans;
8444         int err;
8445
8446         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8447                                        extack, false);
8448         if (err < 0)
8449                 return err;
8450
8451         list_for_each_entry(this, &flowtable_hook.list, list) {
8452                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8453                 if (!hook) {
8454                         err = -ENOENT;
8455                         goto err_flowtable_del_hook;
8456                 }
8457                 list_move(&hook->list, &flowtable_del_list);
8458         }
8459
8460         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8461                                 sizeof(struct nft_trans_flowtable));
8462         if (!trans) {
8463                 err = -ENOMEM;
8464                 goto err_flowtable_del_hook;
8465         }
8466
8467         nft_trans_flowtable(trans) = flowtable;
8468         nft_trans_flowtable_update(trans) = true;
8469         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8470         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8471         nft_flowtable_hook_release(&flowtable_hook);
8472
8473         nft_trans_commit_list_add_tail(ctx->net, trans);
8474
8475         return 0;
8476
8477 err_flowtable_del_hook:
8478         list_splice(&flowtable_del_list, &flowtable->hook_list);
8479         nft_flowtable_hook_release(&flowtable_hook);
8480
8481         return err;
8482 }
8483
8484 static int nf_tables_delflowtable(struct sk_buff *skb,
8485                                   const struct nfnl_info *info,
8486                                   const struct nlattr * const nla[])
8487 {
8488         struct netlink_ext_ack *extack = info->extack;
8489         u8 genmask = nft_genmask_next(info->net);
8490         u8 family = info->nfmsg->nfgen_family;
8491         struct nft_flowtable *flowtable;
8492         struct net *net = info->net;
8493         const struct nlattr *attr;
8494         struct nft_table *table;
8495         struct nft_ctx ctx;
8496
8497         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8498             (!nla[NFTA_FLOWTABLE_NAME] &&
8499              !nla[NFTA_FLOWTABLE_HANDLE]))
8500                 return -EINVAL;
8501
8502         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8503                                  genmask, NETLINK_CB(skb).portid);
8504         if (IS_ERR(table)) {
8505                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8506                 return PTR_ERR(table);
8507         }
8508
8509         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8510                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8511                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8512         } else {
8513                 attr = nla[NFTA_FLOWTABLE_NAME];
8514                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8515         }
8516
8517         if (IS_ERR(flowtable)) {
8518                 if (PTR_ERR(flowtable) == -ENOENT &&
8519                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8520                         return 0;
8521
8522                 NL_SET_BAD_ATTR(extack, attr);
8523                 return PTR_ERR(flowtable);
8524         }
8525
8526         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8527
8528         if (nla[NFTA_FLOWTABLE_HOOK])
8529                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8530
8531         if (flowtable->use > 0) {
8532                 NL_SET_BAD_ATTR(extack, attr);
8533                 return -EBUSY;
8534         }
8535
8536         return nft_delflowtable(&ctx, flowtable);
8537 }
8538
8539 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8540                                          u32 portid, u32 seq, int event,
8541                                          u32 flags, int family,
8542                                          struct nft_flowtable *flowtable,
8543                                          struct list_head *hook_list)
8544 {
8545         struct nlattr *nest, *nest_devs;
8546         struct nft_hook *hook;
8547         struct nlmsghdr *nlh;
8548
8549         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8550         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8551                            NFNETLINK_V0, nft_base_seq(net));
8552         if (!nlh)
8553                 goto nla_put_failure;
8554
8555         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8556             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8557             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8558                          NFTA_FLOWTABLE_PAD))
8559                 goto nla_put_failure;
8560
8561         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8562                 nlmsg_end(skb, nlh);
8563                 return 0;
8564         }
8565
8566         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8567             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8568                 goto nla_put_failure;
8569
8570         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8571         if (!nest)
8572                 goto nla_put_failure;
8573         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8574             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8575                 goto nla_put_failure;
8576
8577         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8578         if (!nest_devs)
8579                 goto nla_put_failure;
8580
8581         if (!hook_list)
8582                 hook_list = &flowtable->hook_list;
8583
8584         list_for_each_entry_rcu(hook, hook_list, list) {
8585                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8586                         goto nla_put_failure;
8587         }
8588         nla_nest_end(skb, nest_devs);
8589         nla_nest_end(skb, nest);
8590
8591         nlmsg_end(skb, nlh);
8592         return 0;
8593
8594 nla_put_failure:
8595         nlmsg_trim(skb, nlh);
8596         return -1;
8597 }
8598
8599 struct nft_flowtable_filter {
8600         char            *table;
8601 };
8602
8603 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8604                                     struct netlink_callback *cb)
8605 {
8606         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8607         struct nft_flowtable_filter *filter = cb->data;
8608         unsigned int idx = 0, s_idx = cb->args[0];
8609         struct net *net = sock_net(skb->sk);
8610         int family = nfmsg->nfgen_family;
8611         struct nft_flowtable *flowtable;
8612         struct nftables_pernet *nft_net;
8613         const struct nft_table *table;
8614
8615         rcu_read_lock();
8616         nft_net = nft_pernet(net);
8617         cb->seq = READ_ONCE(nft_net->base_seq);
8618
8619         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8620                 if (family != NFPROTO_UNSPEC && family != table->family)
8621                         continue;
8622
8623                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8624                         if (!nft_is_active(net, flowtable))
8625                                 goto cont;
8626                         if (idx < s_idx)
8627                                 goto cont;
8628                         if (idx > s_idx)
8629                                 memset(&cb->args[1], 0,
8630                                        sizeof(cb->args) - sizeof(cb->args[0]));
8631                         if (filter && filter->table &&
8632                             strcmp(filter->table, table->name))
8633                                 goto cont;
8634
8635                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8636                                                           cb->nlh->nlmsg_seq,
8637                                                           NFT_MSG_NEWFLOWTABLE,
8638                                                           NLM_F_MULTI | NLM_F_APPEND,
8639                                                           table->family,
8640                                                           flowtable, NULL) < 0)
8641                                 goto done;
8642
8643                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8644 cont:
8645                         idx++;
8646                 }
8647         }
8648 done:
8649         rcu_read_unlock();
8650
8651         cb->args[0] = idx;
8652         return skb->len;
8653 }
8654
8655 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8656 {
8657         const struct nlattr * const *nla = cb->data;
8658         struct nft_flowtable_filter *filter = NULL;
8659
8660         if (nla[NFTA_FLOWTABLE_TABLE]) {
8661                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8662                 if (!filter)
8663                         return -ENOMEM;
8664
8665                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8666                                            GFP_ATOMIC);
8667                 if (!filter->table) {
8668                         kfree(filter);
8669                         return -ENOMEM;
8670                 }
8671         }
8672
8673         cb->data = filter;
8674         return 0;
8675 }
8676
8677 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8678 {
8679         struct nft_flowtable_filter *filter = cb->data;
8680
8681         if (!filter)
8682                 return 0;
8683
8684         kfree(filter->table);
8685         kfree(filter);
8686
8687         return 0;
8688 }
8689
8690 /* called with rcu_read_lock held */
8691 static int nf_tables_getflowtable(struct sk_buff *skb,
8692                                   const struct nfnl_info *info,
8693                                   const struct nlattr * const nla[])
8694 {
8695         u8 genmask = nft_genmask_cur(info->net);
8696         u8 family = info->nfmsg->nfgen_family;
8697         struct nft_flowtable *flowtable;
8698         const struct nft_table *table;
8699         struct net *net = info->net;
8700         struct sk_buff *skb2;
8701         int err;
8702
8703         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8704                 struct netlink_dump_control c = {
8705                         .start = nf_tables_dump_flowtable_start,
8706                         .dump = nf_tables_dump_flowtable,
8707                         .done = nf_tables_dump_flowtable_done,
8708                         .module = THIS_MODULE,
8709                         .data = (void *)nla,
8710                 };
8711
8712                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8713         }
8714
8715         if (!nla[NFTA_FLOWTABLE_NAME])
8716                 return -EINVAL;
8717
8718         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8719                                  genmask, 0);
8720         if (IS_ERR(table))
8721                 return PTR_ERR(table);
8722
8723         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8724                                          genmask);
8725         if (IS_ERR(flowtable))
8726                 return PTR_ERR(flowtable);
8727
8728         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8729         if (!skb2)
8730                 return -ENOMEM;
8731
8732         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8733                                             info->nlh->nlmsg_seq,
8734                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8735                                             flowtable, NULL);
8736         if (err < 0)
8737                 goto err_fill_flowtable_info;
8738
8739         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8740
8741 err_fill_flowtable_info:
8742         kfree_skb(skb2);
8743         return err;
8744 }
8745
8746 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8747                                        struct nft_flowtable *flowtable,
8748                                        struct list_head *hook_list, int event)
8749 {
8750         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8751         struct sk_buff *skb;
8752         u16 flags = 0;
8753         int err;
8754
8755         if (!ctx->report &&
8756             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8757                 return;
8758
8759         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8760         if (skb == NULL)
8761                 goto err;
8762
8763         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8764                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8765
8766         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8767                                             ctx->seq, event, flags,
8768                                             ctx->family, flowtable, hook_list);
8769         if (err < 0) {
8770                 kfree_skb(skb);
8771                 goto err;
8772         }
8773
8774         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8775         return;
8776 err:
8777         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8778 }
8779
8780 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8781 {
8782         struct nft_hook *hook, *next;
8783
8784         flowtable->data.type->free(&flowtable->data);
8785         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8786                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8787                                             FLOW_BLOCK_UNBIND);
8788                 list_del_rcu(&hook->list);
8789                 kfree(hook);
8790         }
8791         kfree(flowtable->name);
8792         module_put(flowtable->data.type->owner);
8793         kfree(flowtable);
8794 }
8795
8796 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8797                                    u32 portid, u32 seq)
8798 {
8799         struct nftables_pernet *nft_net = nft_pernet(net);
8800         struct nlmsghdr *nlh;
8801         char buf[TASK_COMM_LEN];
8802         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8803
8804         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8805                            NFNETLINK_V0, nft_base_seq(net));
8806         if (!nlh)
8807                 goto nla_put_failure;
8808
8809         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8810             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8811             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8812                 goto nla_put_failure;
8813
8814         nlmsg_end(skb, nlh);
8815         return 0;
8816
8817 nla_put_failure:
8818         nlmsg_trim(skb, nlh);
8819         return -EMSGSIZE;
8820 }
8821
8822 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8823                                 struct nft_flowtable *flowtable)
8824 {
8825         struct nft_hook *hook;
8826
8827         list_for_each_entry(hook, &flowtable->hook_list, list) {
8828                 if (hook->ops.dev != dev)
8829                         continue;
8830
8831                 /* flow_offload_netdev_event() cleans up entries for us. */
8832                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8833                 list_del_rcu(&hook->list);
8834                 kfree_rcu(hook, rcu);
8835                 break;
8836         }
8837 }
8838
8839 static int nf_tables_flowtable_event(struct notifier_block *this,
8840                                      unsigned long event, void *ptr)
8841 {
8842         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8843         struct nft_flowtable *flowtable;
8844         struct nftables_pernet *nft_net;
8845         struct nft_table *table;
8846         struct net *net;
8847
8848         if (event != NETDEV_UNREGISTER)
8849                 return 0;
8850
8851         net = dev_net(dev);
8852         nft_net = nft_pernet(net);
8853         mutex_lock(&nft_net->commit_mutex);
8854         list_for_each_entry(table, &nft_net->tables, list) {
8855                 list_for_each_entry(flowtable, &table->flowtables, list) {
8856                         nft_flowtable_event(event, dev, flowtable);
8857                 }
8858         }
8859         mutex_unlock(&nft_net->commit_mutex);
8860
8861         return NOTIFY_DONE;
8862 }
8863
8864 static struct notifier_block nf_tables_flowtable_notifier = {
8865         .notifier_call  = nf_tables_flowtable_event,
8866 };
8867
8868 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8869                                  int event)
8870 {
8871         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8872         struct sk_buff *skb2;
8873         int err;
8874
8875         if (!nlmsg_report(nlh) &&
8876             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8877                 return;
8878
8879         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8880         if (skb2 == NULL)
8881                 goto err;
8882
8883         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8884                                       nlh->nlmsg_seq);
8885         if (err < 0) {
8886                 kfree_skb(skb2);
8887                 goto err;
8888         }
8889
8890         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8891                        nlmsg_report(nlh), GFP_KERNEL);
8892         return;
8893 err:
8894         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8895                           -ENOBUFS);
8896 }
8897
8898 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8899                             const struct nlattr * const nla[])
8900 {
8901         struct sk_buff *skb2;
8902         int err;
8903
8904         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8905         if (skb2 == NULL)
8906                 return -ENOMEM;
8907
8908         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8909                                       info->nlh->nlmsg_seq);
8910         if (err < 0)
8911                 goto err_fill_gen_info;
8912
8913         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8914
8915 err_fill_gen_info:
8916         kfree_skb(skb2);
8917         return err;
8918 }
8919
8920 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8921         [NFT_MSG_NEWTABLE] = {
8922                 .call           = nf_tables_newtable,
8923                 .type           = NFNL_CB_BATCH,
8924                 .attr_count     = NFTA_TABLE_MAX,
8925                 .policy         = nft_table_policy,
8926         },
8927         [NFT_MSG_GETTABLE] = {
8928                 .call           = nf_tables_gettable,
8929                 .type           = NFNL_CB_RCU,
8930                 .attr_count     = NFTA_TABLE_MAX,
8931                 .policy         = nft_table_policy,
8932         },
8933         [NFT_MSG_DELTABLE] = {
8934                 .call           = nf_tables_deltable,
8935                 .type           = NFNL_CB_BATCH,
8936                 .attr_count     = NFTA_TABLE_MAX,
8937                 .policy         = nft_table_policy,
8938         },
8939         [NFT_MSG_DESTROYTABLE] = {
8940                 .call           = nf_tables_deltable,
8941                 .type           = NFNL_CB_BATCH,
8942                 .attr_count     = NFTA_TABLE_MAX,
8943                 .policy         = nft_table_policy,
8944         },
8945         [NFT_MSG_NEWCHAIN] = {
8946                 .call           = nf_tables_newchain,
8947                 .type           = NFNL_CB_BATCH,
8948                 .attr_count     = NFTA_CHAIN_MAX,
8949                 .policy         = nft_chain_policy,
8950         },
8951         [NFT_MSG_GETCHAIN] = {
8952                 .call           = nf_tables_getchain,
8953                 .type           = NFNL_CB_RCU,
8954                 .attr_count     = NFTA_CHAIN_MAX,
8955                 .policy         = nft_chain_policy,
8956         },
8957         [NFT_MSG_DELCHAIN] = {
8958                 .call           = nf_tables_delchain,
8959                 .type           = NFNL_CB_BATCH,
8960                 .attr_count     = NFTA_CHAIN_MAX,
8961                 .policy         = nft_chain_policy,
8962         },
8963         [NFT_MSG_DESTROYCHAIN] = {
8964                 .call           = nf_tables_delchain,
8965                 .type           = NFNL_CB_BATCH,
8966                 .attr_count     = NFTA_CHAIN_MAX,
8967                 .policy         = nft_chain_policy,
8968         },
8969         [NFT_MSG_NEWRULE] = {
8970                 .call           = nf_tables_newrule,
8971                 .type           = NFNL_CB_BATCH,
8972                 .attr_count     = NFTA_RULE_MAX,
8973                 .policy         = nft_rule_policy,
8974         },
8975         [NFT_MSG_GETRULE] = {
8976                 .call           = nf_tables_getrule,
8977                 .type           = NFNL_CB_RCU,
8978                 .attr_count     = NFTA_RULE_MAX,
8979                 .policy         = nft_rule_policy,
8980         },
8981         [NFT_MSG_GETRULE_RESET] = {
8982                 .call           = nf_tables_getrule,
8983                 .type           = NFNL_CB_RCU,
8984                 .attr_count     = NFTA_RULE_MAX,
8985                 .policy         = nft_rule_policy,
8986         },
8987         [NFT_MSG_DELRULE] = {
8988                 .call           = nf_tables_delrule,
8989                 .type           = NFNL_CB_BATCH,
8990                 .attr_count     = NFTA_RULE_MAX,
8991                 .policy         = nft_rule_policy,
8992         },
8993         [NFT_MSG_DESTROYRULE] = {
8994                 .call           = nf_tables_delrule,
8995                 .type           = NFNL_CB_BATCH,
8996                 .attr_count     = NFTA_RULE_MAX,
8997                 .policy         = nft_rule_policy,
8998         },
8999         [NFT_MSG_NEWSET] = {
9000                 .call           = nf_tables_newset,
9001                 .type           = NFNL_CB_BATCH,
9002                 .attr_count     = NFTA_SET_MAX,
9003                 .policy         = nft_set_policy,
9004         },
9005         [NFT_MSG_GETSET] = {
9006                 .call           = nf_tables_getset,
9007                 .type           = NFNL_CB_RCU,
9008                 .attr_count     = NFTA_SET_MAX,
9009                 .policy         = nft_set_policy,
9010         },
9011         [NFT_MSG_DELSET] = {
9012                 .call           = nf_tables_delset,
9013                 .type           = NFNL_CB_BATCH,
9014                 .attr_count     = NFTA_SET_MAX,
9015                 .policy         = nft_set_policy,
9016         },
9017         [NFT_MSG_DESTROYSET] = {
9018                 .call           = nf_tables_delset,
9019                 .type           = NFNL_CB_BATCH,
9020                 .attr_count     = NFTA_SET_MAX,
9021                 .policy         = nft_set_policy,
9022         },
9023         [NFT_MSG_NEWSETELEM] = {
9024                 .call           = nf_tables_newsetelem,
9025                 .type           = NFNL_CB_BATCH,
9026                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9027                 .policy         = nft_set_elem_list_policy,
9028         },
9029         [NFT_MSG_GETSETELEM] = {
9030                 .call           = nf_tables_getsetelem,
9031                 .type           = NFNL_CB_RCU,
9032                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9033                 .policy         = nft_set_elem_list_policy,
9034         },
9035         [NFT_MSG_GETSETELEM_RESET] = {
9036                 .call           = nf_tables_getsetelem,
9037                 .type           = NFNL_CB_RCU,
9038                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9039                 .policy         = nft_set_elem_list_policy,
9040         },
9041         [NFT_MSG_DELSETELEM] = {
9042                 .call           = nf_tables_delsetelem,
9043                 .type           = NFNL_CB_BATCH,
9044                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9045                 .policy         = nft_set_elem_list_policy,
9046         },
9047         [NFT_MSG_DESTROYSETELEM] = {
9048                 .call           = nf_tables_delsetelem,
9049                 .type           = NFNL_CB_BATCH,
9050                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9051                 .policy         = nft_set_elem_list_policy,
9052         },
9053         [NFT_MSG_GETGEN] = {
9054                 .call           = nf_tables_getgen,
9055                 .type           = NFNL_CB_RCU,
9056         },
9057         [NFT_MSG_NEWOBJ] = {
9058                 .call           = nf_tables_newobj,
9059                 .type           = NFNL_CB_BATCH,
9060                 .attr_count     = NFTA_OBJ_MAX,
9061                 .policy         = nft_obj_policy,
9062         },
9063         [NFT_MSG_GETOBJ] = {
9064                 .call           = nf_tables_getobj,
9065                 .type           = NFNL_CB_RCU,
9066                 .attr_count     = NFTA_OBJ_MAX,
9067                 .policy         = nft_obj_policy,
9068         },
9069         [NFT_MSG_DELOBJ] = {
9070                 .call           = nf_tables_delobj,
9071                 .type           = NFNL_CB_BATCH,
9072                 .attr_count     = NFTA_OBJ_MAX,
9073                 .policy         = nft_obj_policy,
9074         },
9075         [NFT_MSG_DESTROYOBJ] = {
9076                 .call           = nf_tables_delobj,
9077                 .type           = NFNL_CB_BATCH,
9078                 .attr_count     = NFTA_OBJ_MAX,
9079                 .policy         = nft_obj_policy,
9080         },
9081         [NFT_MSG_GETOBJ_RESET] = {
9082                 .call           = nf_tables_getobj,
9083                 .type           = NFNL_CB_RCU,
9084                 .attr_count     = NFTA_OBJ_MAX,
9085                 .policy         = nft_obj_policy,
9086         },
9087         [NFT_MSG_NEWFLOWTABLE] = {
9088                 .call           = nf_tables_newflowtable,
9089                 .type           = NFNL_CB_BATCH,
9090                 .attr_count     = NFTA_FLOWTABLE_MAX,
9091                 .policy         = nft_flowtable_policy,
9092         },
9093         [NFT_MSG_GETFLOWTABLE] = {
9094                 .call           = nf_tables_getflowtable,
9095                 .type           = NFNL_CB_RCU,
9096                 .attr_count     = NFTA_FLOWTABLE_MAX,
9097                 .policy         = nft_flowtable_policy,
9098         },
9099         [NFT_MSG_DELFLOWTABLE] = {
9100                 .call           = nf_tables_delflowtable,
9101                 .type           = NFNL_CB_BATCH,
9102                 .attr_count     = NFTA_FLOWTABLE_MAX,
9103                 .policy         = nft_flowtable_policy,
9104         },
9105         [NFT_MSG_DESTROYFLOWTABLE] = {
9106                 .call           = nf_tables_delflowtable,
9107                 .type           = NFNL_CB_BATCH,
9108                 .attr_count     = NFTA_FLOWTABLE_MAX,
9109                 .policy         = nft_flowtable_policy,
9110         },
9111 };
9112
9113 static int nf_tables_validate(struct net *net)
9114 {
9115         struct nftables_pernet *nft_net = nft_pernet(net);
9116         struct nft_table *table;
9117
9118         list_for_each_entry(table, &nft_net->tables, list) {
9119                 switch (table->validate_state) {
9120                 case NFT_VALIDATE_SKIP:
9121                         continue;
9122                 case NFT_VALIDATE_NEED:
9123                         nft_validate_state_update(table, NFT_VALIDATE_DO);
9124                         fallthrough;
9125                 case NFT_VALIDATE_DO:
9126                         if (nft_table_validate(net, table) < 0)
9127                                 return -EAGAIN;
9128
9129                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9130                         break;
9131                 }
9132         }
9133
9134         return 0;
9135 }
9136
9137 /* a drop policy has to be deferred until all rules have been activated,
9138  * otherwise a large ruleset that contains a drop-policy base chain will
9139  * cause all packets to get dropped until the full transaction has been
9140  * processed.
9141  *
9142  * We defer the drop policy until the transaction has been finalized.
9143  */
9144 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9145 {
9146         struct nft_base_chain *basechain;
9147
9148         if (nft_trans_chain_policy(trans) != NF_DROP)
9149                 return;
9150
9151         if (!nft_is_base_chain(trans->ctx.chain))
9152                 return;
9153
9154         basechain = nft_base_chain(trans->ctx.chain);
9155         basechain->policy = NF_DROP;
9156 }
9157
9158 static void nft_chain_commit_update(struct nft_trans *trans)
9159 {
9160         struct nft_base_chain *basechain;
9161
9162         if (nft_trans_chain_name(trans)) {
9163                 rhltable_remove(&trans->ctx.table->chains_ht,
9164                                 &trans->ctx.chain->rhlhead,
9165                                 nft_chain_ht_params);
9166                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9167                 rhltable_insert_key(&trans->ctx.table->chains_ht,
9168                                     trans->ctx.chain->name,
9169                                     &trans->ctx.chain->rhlhead,
9170                                     nft_chain_ht_params);
9171         }
9172
9173         if (!nft_is_base_chain(trans->ctx.chain))
9174                 return;
9175
9176         nft_chain_stats_replace(trans);
9177
9178         basechain = nft_base_chain(trans->ctx.chain);
9179
9180         switch (nft_trans_chain_policy(trans)) {
9181         case NF_DROP:
9182         case NF_ACCEPT:
9183                 basechain->policy = nft_trans_chain_policy(trans);
9184                 break;
9185         }
9186 }
9187
9188 static void nft_obj_commit_update(struct nft_trans *trans)
9189 {
9190         struct nft_object *newobj;
9191         struct nft_object *obj;
9192
9193         obj = nft_trans_obj(trans);
9194         newobj = nft_trans_obj_newobj(trans);
9195
9196         if (obj->ops->update)
9197                 obj->ops->update(obj, newobj);
9198
9199         nft_obj_destroy(&trans->ctx, newobj);
9200 }
9201
9202 static void nft_commit_release(struct nft_trans *trans)
9203 {
9204         switch (trans->msg_type) {
9205         case NFT_MSG_DELTABLE:
9206         case NFT_MSG_DESTROYTABLE:
9207                 nf_tables_table_destroy(&trans->ctx);
9208                 break;
9209         case NFT_MSG_NEWCHAIN:
9210                 free_percpu(nft_trans_chain_stats(trans));
9211                 kfree(nft_trans_chain_name(trans));
9212                 break;
9213         case NFT_MSG_DELCHAIN:
9214         case NFT_MSG_DESTROYCHAIN:
9215                 if (nft_trans_chain_update(trans))
9216                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9217                 else
9218                         nf_tables_chain_destroy(&trans->ctx);
9219                 break;
9220         case NFT_MSG_DELRULE:
9221         case NFT_MSG_DESTROYRULE:
9222                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9223                 break;
9224         case NFT_MSG_DELSET:
9225         case NFT_MSG_DESTROYSET:
9226                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9227                 break;
9228         case NFT_MSG_DELSETELEM:
9229         case NFT_MSG_DESTROYSETELEM:
9230                 nf_tables_set_elem_destroy(&trans->ctx,
9231                                            nft_trans_elem_set(trans),
9232                                            nft_trans_elem(trans).priv);
9233                 break;
9234         case NFT_MSG_DELOBJ:
9235         case NFT_MSG_DESTROYOBJ:
9236                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9237                 break;
9238         case NFT_MSG_DELFLOWTABLE:
9239         case NFT_MSG_DESTROYFLOWTABLE:
9240                 if (nft_trans_flowtable_update(trans))
9241                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9242                 else
9243                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9244                 break;
9245         }
9246
9247         if (trans->put_net)
9248                 put_net(trans->ctx.net);
9249
9250         kfree(trans);
9251 }
9252
9253 static void nf_tables_trans_destroy_work(struct work_struct *w)
9254 {
9255         struct nft_trans *trans, *next;
9256         LIST_HEAD(head);
9257
9258         spin_lock(&nf_tables_destroy_list_lock);
9259         list_splice_init(&nf_tables_destroy_list, &head);
9260         spin_unlock(&nf_tables_destroy_list_lock);
9261
9262         if (list_empty(&head))
9263                 return;
9264
9265         synchronize_rcu();
9266
9267         list_for_each_entry_safe(trans, next, &head, list) {
9268                 nft_trans_list_del(trans);
9269                 nft_commit_release(trans);
9270         }
9271 }
9272
9273 void nf_tables_trans_destroy_flush_work(void)
9274 {
9275         flush_work(&trans_destroy_work);
9276 }
9277 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9278
9279 static bool nft_expr_reduce(struct nft_regs_track *track,
9280                             const struct nft_expr *expr)
9281 {
9282         return false;
9283 }
9284
9285 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9286 {
9287         const struct nft_expr *expr, *last;
9288         struct nft_regs_track track = {};
9289         unsigned int size, data_size;
9290         void *data, *data_boundary;
9291         struct nft_rule_dp *prule;
9292         struct nft_rule *rule;
9293
9294         /* already handled or inactive chain? */
9295         if (chain->blob_next || !nft_is_active_next(net, chain))
9296                 return 0;
9297
9298         data_size = 0;
9299         list_for_each_entry(rule, &chain->rules, list) {
9300                 if (nft_is_active_next(net, rule)) {
9301                         data_size += sizeof(*prule) + rule->dlen;
9302                         if (data_size > INT_MAX)
9303                                 return -ENOMEM;
9304                 }
9305         }
9306
9307         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9308         if (!chain->blob_next)
9309                 return -ENOMEM;
9310
9311         data = (void *)chain->blob_next->data;
9312         data_boundary = data + data_size;
9313         size = 0;
9314
9315         list_for_each_entry(rule, &chain->rules, list) {
9316                 if (!nft_is_active_next(net, rule))
9317                         continue;
9318
9319                 prule = (struct nft_rule_dp *)data;
9320                 data += offsetof(struct nft_rule_dp, data);
9321                 if (WARN_ON_ONCE(data > data_boundary))
9322                         return -ENOMEM;
9323
9324                 size = 0;
9325                 track.last = nft_expr_last(rule);
9326                 nft_rule_for_each_expr(expr, last, rule) {
9327                         track.cur = expr;
9328
9329                         if (nft_expr_reduce(&track, expr)) {
9330                                 expr = track.cur;
9331                                 continue;
9332                         }
9333
9334                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9335                                 return -ENOMEM;
9336
9337                         memcpy(data + size, expr, expr->ops->size);
9338                         size += expr->ops->size;
9339                 }
9340                 if (WARN_ON_ONCE(size >= 1 << 12))
9341                         return -ENOMEM;
9342
9343                 prule->handle = rule->handle;
9344                 prule->dlen = size;
9345                 prule->is_last = 0;
9346
9347                 data += size;
9348                 size = 0;
9349                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9350         }
9351
9352         if (WARN_ON_ONCE(data > data_boundary))
9353                 return -ENOMEM;
9354
9355         prule = (struct nft_rule_dp *)data;
9356         nft_last_rule(chain, prule);
9357
9358         return 0;
9359 }
9360
9361 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9362 {
9363         struct nftables_pernet *nft_net = nft_pernet(net);
9364         struct nft_trans *trans, *next;
9365
9366         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9367                 struct nft_chain *chain = trans->ctx.chain;
9368
9369                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9370                     trans->msg_type == NFT_MSG_DELRULE) {
9371                         kvfree(chain->blob_next);
9372                         chain->blob_next = NULL;
9373                 }
9374         }
9375 }
9376
9377 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9378 {
9379         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9380
9381         kvfree(l->blob);
9382 }
9383
9384 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9385 {
9386         struct nft_rule_dp_last *last;
9387
9388         /* last rule trailer is after end marker */
9389         last = (void *)blob + sizeof(*blob) + blob->size;
9390         last->blob = blob;
9391
9392         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9393 }
9394
9395 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9396 {
9397         struct nft_rule_blob *g0, *g1;
9398         bool next_genbit;
9399
9400         next_genbit = nft_gencursor_next(net);
9401
9402         g0 = rcu_dereference_protected(chain->blob_gen_0,
9403                                        lockdep_commit_lock_is_held(net));
9404         g1 = rcu_dereference_protected(chain->blob_gen_1,
9405                                        lockdep_commit_lock_is_held(net));
9406
9407         /* No changes to this chain? */
9408         if (chain->blob_next == NULL) {
9409                 /* chain had no change in last or next generation */
9410                 if (g0 == g1)
9411                         return;
9412                 /*
9413                  * chain had no change in this generation; make sure next
9414                  * one uses same rules as current generation.
9415                  */
9416                 if (next_genbit) {
9417                         rcu_assign_pointer(chain->blob_gen_1, g0);
9418                         nf_tables_commit_chain_free_rules_old(g1);
9419                 } else {
9420                         rcu_assign_pointer(chain->blob_gen_0, g1);
9421                         nf_tables_commit_chain_free_rules_old(g0);
9422                 }
9423
9424                 return;
9425         }
9426
9427         if (next_genbit)
9428                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9429         else
9430                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9431
9432         chain->blob_next = NULL;
9433
9434         if (g0 == g1)
9435                 return;
9436
9437         if (next_genbit)
9438                 nf_tables_commit_chain_free_rules_old(g1);
9439         else
9440                 nf_tables_commit_chain_free_rules_old(g0);
9441 }
9442
9443 static void nft_obj_del(struct nft_object *obj)
9444 {
9445         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9446         list_del_rcu(&obj->list);
9447 }
9448
9449 void nft_chain_del(struct nft_chain *chain)
9450 {
9451         struct nft_table *table = chain->table;
9452
9453         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9454                                      nft_chain_ht_params));
9455         list_del_rcu(&chain->list);
9456 }
9457
9458 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9459                                         struct nft_trans_gc *trans)
9460 {
9461         void **priv = trans->priv;
9462         unsigned int i;
9463
9464         for (i = 0; i < trans->count; i++) {
9465                 struct nft_set_elem elem = {
9466                         .priv = priv[i],
9467                 };
9468
9469                 nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9470                 nft_setelem_remove(ctx->net, trans->set, &elem);
9471         }
9472 }
9473
9474 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9475 {
9476         nft_set_put(trans->set);
9477         put_net(trans->net);
9478         kfree(trans);
9479 }
9480
9481 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9482 {
9483         struct nft_set_elem elem = {};
9484         struct nft_trans_gc *trans;
9485         struct nft_ctx ctx = {};
9486         unsigned int i;
9487
9488         trans = container_of(rcu, struct nft_trans_gc, rcu);
9489         ctx.net = read_pnet(&trans->set->net);
9490
9491         for (i = 0; i < trans->count; i++) {
9492                 elem.priv = trans->priv[i];
9493                 if (!nft_setelem_is_catchall(trans->set, &elem))
9494                         atomic_dec(&trans->set->nelems);
9495
9496                 nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9497         }
9498
9499         nft_trans_gc_destroy(trans);
9500 }
9501
9502 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9503 {
9504         struct nftables_pernet *nft_net;
9505         struct nft_ctx ctx = {};
9506
9507         nft_net = nft_pernet(trans->net);
9508
9509         mutex_lock(&nft_net->commit_mutex);
9510
9511         /* Check for race with transaction, otherwise this batch refers to
9512          * stale objects that might not be there anymore. Skip transaction if
9513          * set has been destroyed from control plane transaction in case gc
9514          * worker loses race.
9515          */
9516         if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9517                 mutex_unlock(&nft_net->commit_mutex);
9518                 return false;
9519         }
9520
9521         ctx.net = trans->net;
9522         ctx.table = trans->set->table;
9523
9524         nft_trans_gc_setelem_remove(&ctx, trans);
9525         mutex_unlock(&nft_net->commit_mutex);
9526
9527         return true;
9528 }
9529
9530 static void nft_trans_gc_work(struct work_struct *work)
9531 {
9532         struct nft_trans_gc *trans, *next;
9533         LIST_HEAD(trans_gc_list);
9534
9535         spin_lock(&nf_tables_gc_list_lock);
9536         list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9537         spin_unlock(&nf_tables_gc_list_lock);
9538
9539         list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9540                 list_del(&trans->list);
9541                 if (!nft_trans_gc_work_done(trans)) {
9542                         nft_trans_gc_destroy(trans);
9543                         continue;
9544                 }
9545                 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9546         }
9547 }
9548
9549 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9550                                         unsigned int gc_seq, gfp_t gfp)
9551 {
9552         struct net *net = read_pnet(&set->net);
9553         struct nft_trans_gc *trans;
9554
9555         trans = kzalloc(sizeof(*trans), gfp);
9556         if (!trans)
9557                 return NULL;
9558
9559         trans->net = maybe_get_net(net);
9560         if (!trans->net) {
9561                 kfree(trans);
9562                 return NULL;
9563         }
9564
9565         refcount_inc(&set->refs);
9566         trans->set = set;
9567         trans->seq = gc_seq;
9568
9569         return trans;
9570 }
9571
9572 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9573 {
9574         trans->priv[trans->count++] = priv;
9575 }
9576
9577 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9578 {
9579         spin_lock(&nf_tables_gc_list_lock);
9580         list_add_tail(&trans->list, &nf_tables_gc_list);
9581         spin_unlock(&nf_tables_gc_list_lock);
9582
9583         schedule_work(&trans_gc_work);
9584 }
9585
9586 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9587 {
9588         return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9589 }
9590
9591 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9592                                               unsigned int gc_seq, gfp_t gfp)
9593 {
9594         struct nft_set *set;
9595
9596         if (nft_trans_gc_space(gc))
9597                 return gc;
9598
9599         set = gc->set;
9600         nft_trans_gc_queue_work(gc);
9601
9602         return nft_trans_gc_alloc(set, gc_seq, gfp);
9603 }
9604
9605 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9606 {
9607         if (trans->count == 0) {
9608                 nft_trans_gc_destroy(trans);
9609                 return;
9610         }
9611
9612         nft_trans_gc_queue_work(trans);
9613 }
9614
9615 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9616 {
9617         struct nft_set *set;
9618
9619         if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9620                 return NULL;
9621
9622         if (nft_trans_gc_space(gc))
9623                 return gc;
9624
9625         set = gc->set;
9626         call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9627
9628         return nft_trans_gc_alloc(set, 0, gfp);
9629 }
9630
9631 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9632 {
9633         WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9634
9635         if (trans->count == 0) {
9636                 nft_trans_gc_destroy(trans);
9637                 return;
9638         }
9639
9640         call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9641 }
9642
9643 static struct nft_trans_gc *nft_trans_gc_catchall(struct nft_trans_gc *gc,
9644                                                   unsigned int gc_seq,
9645                                                   bool sync)
9646 {
9647         struct nft_set_elem_catchall *catchall;
9648         const struct nft_set *set = gc->set;
9649         struct nft_set_ext *ext;
9650
9651         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9652                 ext = nft_set_elem_ext(set, catchall->elem);
9653
9654                 if (!nft_set_elem_expired(ext))
9655                         continue;
9656                 if (nft_set_elem_is_dead(ext))
9657                         goto dead_elem;
9658
9659                 nft_set_elem_dead(ext);
9660 dead_elem:
9661                 if (sync)
9662                         gc = nft_trans_gc_queue_sync(gc, GFP_ATOMIC);
9663                 else
9664                         gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9665
9666                 if (!gc)
9667                         return NULL;
9668
9669                 nft_trans_gc_elem_add(gc, catchall->elem);
9670         }
9671
9672         return gc;
9673 }
9674
9675 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9676                                                  unsigned int gc_seq)
9677 {
9678         return nft_trans_gc_catchall(gc, gc_seq, false);
9679 }
9680
9681 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9682 {
9683         return nft_trans_gc_catchall(gc, 0, true);
9684 }
9685
9686 static void nf_tables_module_autoload_cleanup(struct net *net)
9687 {
9688         struct nftables_pernet *nft_net = nft_pernet(net);
9689         struct nft_module_request *req, *next;
9690
9691         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9692         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9693                 WARN_ON_ONCE(!req->done);
9694                 list_del(&req->list);
9695                 kfree(req);
9696         }
9697 }
9698
9699 static void nf_tables_commit_release(struct net *net)
9700 {
9701         struct nftables_pernet *nft_net = nft_pernet(net);
9702         struct nft_trans *trans;
9703
9704         /* all side effects have to be made visible.
9705          * For example, if a chain named 'foo' has been deleted, a
9706          * new transaction must not find it anymore.
9707          *
9708          * Memory reclaim happens asynchronously from work queue
9709          * to prevent expensive synchronize_rcu() in commit phase.
9710          */
9711         if (list_empty(&nft_net->commit_list)) {
9712                 nf_tables_module_autoload_cleanup(net);
9713                 mutex_unlock(&nft_net->commit_mutex);
9714                 return;
9715         }
9716
9717         trans = list_last_entry(&nft_net->commit_list,
9718                                 struct nft_trans, list);
9719         get_net(trans->ctx.net);
9720         WARN_ON_ONCE(trans->put_net);
9721
9722         trans->put_net = true;
9723         spin_lock(&nf_tables_destroy_list_lock);
9724         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9725         spin_unlock(&nf_tables_destroy_list_lock);
9726
9727         nf_tables_module_autoload_cleanup(net);
9728         schedule_work(&trans_destroy_work);
9729
9730         mutex_unlock(&nft_net->commit_mutex);
9731 }
9732
9733 static void nft_commit_notify(struct net *net, u32 portid)
9734 {
9735         struct nftables_pernet *nft_net = nft_pernet(net);
9736         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9737         unsigned char *data;
9738         int len;
9739
9740         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9741                 if (!batch_skb) {
9742 new_batch:
9743                         batch_skb = skb;
9744                         len = NLMSG_GOODSIZE - skb->len;
9745                         list_del(&skb->list);
9746                         continue;
9747                 }
9748                 len -= skb->len;
9749                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9750                         data = skb_put(batch_skb, skb->len);
9751                         memcpy(data, skb->data, skb->len);
9752                         list_del(&skb->list);
9753                         kfree_skb(skb);
9754                         continue;
9755                 }
9756                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9757                                NFT_CB(batch_skb).report, GFP_KERNEL);
9758                 goto new_batch;
9759         }
9760
9761         if (batch_skb) {
9762                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9763                                NFT_CB(batch_skb).report, GFP_KERNEL);
9764         }
9765
9766         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9767 }
9768
9769 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9770                                         struct nft_table *table)
9771 {
9772         struct nft_audit_data *adp;
9773
9774         list_for_each_entry(adp, adl, list) {
9775                 if (adp->table == table)
9776                         return 0;
9777         }
9778         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9779         if (!adp)
9780                 return -ENOMEM;
9781         adp->table = table;
9782         list_add(&adp->list, adl);
9783         return 0;
9784 }
9785
9786 static void nf_tables_commit_audit_free(struct list_head *adl)
9787 {
9788         struct nft_audit_data *adp, *adn;
9789
9790         list_for_each_entry_safe(adp, adn, adl, list) {
9791                 list_del(&adp->list);
9792                 kfree(adp);
9793         }
9794 }
9795
9796 static void nf_tables_commit_audit_collect(struct list_head *adl,
9797                                            struct nft_table *table, u32 op)
9798 {
9799         struct nft_audit_data *adp;
9800
9801         list_for_each_entry(adp, adl, list) {
9802                 if (adp->table == table)
9803                         goto found;
9804         }
9805         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9806         return;
9807 found:
9808         adp->entries++;
9809         if (!adp->op || adp->op > op)
9810                 adp->op = op;
9811 }
9812
9813 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9814
9815 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9816 {
9817         struct nft_audit_data *adp, *adn;
9818         char aubuf[AUNFTABLENAMELEN];
9819
9820         list_for_each_entry_safe(adp, adn, adl, list) {
9821                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9822                          generation);
9823                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9824                                 nft2audit_op[adp->op], GFP_KERNEL);
9825                 list_del(&adp->list);
9826                 kfree(adp);
9827         }
9828 }
9829
9830 static void nft_set_commit_update(struct list_head *set_update_list)
9831 {
9832         struct nft_set *set, *next;
9833
9834         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9835                 list_del_init(&set->pending_update);
9836
9837                 if (!set->ops->commit)
9838                         continue;
9839
9840                 set->ops->commit(set);
9841         }
9842 }
9843
9844 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
9845 {
9846         unsigned int gc_seq;
9847
9848         /* Bump gc counter, it becomes odd, this is the busy mark. */
9849         gc_seq = READ_ONCE(nft_net->gc_seq);
9850         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9851
9852         return gc_seq;
9853 }
9854
9855 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
9856 {
9857         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9858 }
9859
9860 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9861 {
9862         struct nftables_pernet *nft_net = nft_pernet(net);
9863         struct nft_trans *trans, *next;
9864         unsigned int base_seq, gc_seq;
9865         LIST_HEAD(set_update_list);
9866         struct nft_trans_elem *te;
9867         struct nft_chain *chain;
9868         struct nft_table *table;
9869         LIST_HEAD(adl);
9870         int err;
9871
9872         if (list_empty(&nft_net->commit_list)) {
9873                 mutex_unlock(&nft_net->commit_mutex);
9874                 return 0;
9875         }
9876
9877         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9878                 switch (trans->msg_type) {
9879                 case NFT_MSG_NEWSET:
9880                         if (!nft_trans_set_update(trans) &&
9881                             nft_set_is_anonymous(nft_trans_set(trans)) &&
9882                             !nft_trans_set_bound(trans)) {
9883                                 pr_warn_once("nftables ruleset with unbound set\n");
9884                                 return -EINVAL;
9885                         }
9886                         break;
9887                 case NFT_MSG_NEWCHAIN:
9888                         if (!nft_trans_chain_update(trans) &&
9889                             nft_chain_binding(nft_trans_chain(trans)) &&
9890                             !nft_trans_chain_bound(trans)) {
9891                                 pr_warn_once("nftables ruleset with unbound chain\n");
9892                                 return -EINVAL;
9893                         }
9894                         break;
9895                 }
9896         }
9897
9898         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9899         if (nf_tables_validate(net) < 0) {
9900                 nft_net->validate_state = NFT_VALIDATE_DO;
9901                 return -EAGAIN;
9902         }
9903
9904         err = nft_flow_rule_offload_commit(net);
9905         if (err < 0)
9906                 return err;
9907
9908         /* 1.  Allocate space for next generation rules_gen_X[] */
9909         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9910                 int ret;
9911
9912                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9913                 if (ret) {
9914                         nf_tables_commit_chain_prepare_cancel(net);
9915                         nf_tables_commit_audit_free(&adl);
9916                         return ret;
9917                 }
9918                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9919                     trans->msg_type == NFT_MSG_DELRULE) {
9920                         chain = trans->ctx.chain;
9921
9922                         ret = nf_tables_commit_chain_prepare(net, chain);
9923                         if (ret < 0) {
9924                                 nf_tables_commit_chain_prepare_cancel(net);
9925                                 nf_tables_commit_audit_free(&adl);
9926                                 return ret;
9927                         }
9928                 }
9929         }
9930
9931         /* step 2.  Make rules_gen_X visible to packet path */
9932         list_for_each_entry(table, &nft_net->tables, list) {
9933                 list_for_each_entry(chain, &table->chains, list)
9934                         nf_tables_commit_chain(net, chain);
9935         }
9936
9937         /*
9938          * Bump generation counter, invalidate any dump in progress.
9939          * Cannot fail after this point.
9940          */
9941         base_seq = READ_ONCE(nft_net->base_seq);
9942         while (++base_seq == 0)
9943                 ;
9944
9945         WRITE_ONCE(nft_net->base_seq, base_seq);
9946
9947         gc_seq = nft_gc_seq_begin(nft_net);
9948
9949         /* step 3. Start new generation, rules_gen_X now in use. */
9950         net->nft.gencursor = nft_gencursor_next(net);
9951
9952         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9953                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9954                                                trans->msg_type);
9955                 switch (trans->msg_type) {
9956                 case NFT_MSG_NEWTABLE:
9957                         if (nft_trans_table_update(trans)) {
9958                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9959                                         nft_trans_destroy(trans);
9960                                         break;
9961                                 }
9962                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9963                                         nf_tables_table_disable(net, trans->ctx.table);
9964
9965                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9966                         } else {
9967                                 nft_clear(net, trans->ctx.table);
9968                         }
9969                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9970                         nft_trans_destroy(trans);
9971                         break;
9972                 case NFT_MSG_DELTABLE:
9973                 case NFT_MSG_DESTROYTABLE:
9974                         list_del_rcu(&trans->ctx.table->list);
9975                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
9976                         break;
9977                 case NFT_MSG_NEWCHAIN:
9978                         if (nft_trans_chain_update(trans)) {
9979                                 nft_chain_commit_update(trans);
9980                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9981                                                        &nft_trans_chain_hooks(trans));
9982                                 list_splice(&nft_trans_chain_hooks(trans),
9983                                             &nft_trans_basechain(trans)->hook_list);
9984                                 /* trans destroyed after rcu grace period */
9985                         } else {
9986                                 nft_chain_commit_drop_policy(trans);
9987                                 nft_clear(net, trans->ctx.chain);
9988                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9989                                 nft_trans_destroy(trans);
9990                         }
9991                         break;
9992                 case NFT_MSG_DELCHAIN:
9993                 case NFT_MSG_DESTROYCHAIN:
9994                         if (nft_trans_chain_update(trans)) {
9995                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9996                                                        &nft_trans_chain_hooks(trans));
9997                                 nft_netdev_unregister_hooks(net,
9998                                                             &nft_trans_chain_hooks(trans),
9999                                                             true);
10000                         } else {
10001                                 nft_chain_del(trans->ctx.chain);
10002                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10003                                                        NULL);
10004                                 nf_tables_unregister_hook(trans->ctx.net,
10005                                                           trans->ctx.table,
10006                                                           trans->ctx.chain);
10007                         }
10008                         break;
10009                 case NFT_MSG_NEWRULE:
10010                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10011                         nf_tables_rule_notify(&trans->ctx,
10012                                               nft_trans_rule(trans),
10013                                               NFT_MSG_NEWRULE);
10014                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10015                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10016
10017                         nft_trans_destroy(trans);
10018                         break;
10019                 case NFT_MSG_DELRULE:
10020                 case NFT_MSG_DESTROYRULE:
10021                         list_del_rcu(&nft_trans_rule(trans)->list);
10022                         nf_tables_rule_notify(&trans->ctx,
10023                                               nft_trans_rule(trans),
10024                                               trans->msg_type);
10025                         nft_rule_expr_deactivate(&trans->ctx,
10026                                                  nft_trans_rule(trans),
10027                                                  NFT_TRANS_COMMIT);
10028
10029                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10030                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10031                         break;
10032                 case NFT_MSG_NEWSET:
10033                         if (nft_trans_set_update(trans)) {
10034                                 struct nft_set *set = nft_trans_set(trans);
10035
10036                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10037                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10038
10039                                 if (nft_trans_set_size(trans))
10040                                         WRITE_ONCE(set->size, nft_trans_set_size(trans));
10041                         } else {
10042                                 nft_clear(net, nft_trans_set(trans));
10043                                 /* This avoids hitting -EBUSY when deleting the table
10044                                  * from the transaction.
10045                                  */
10046                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10047                                     !list_empty(&nft_trans_set(trans)->bindings))
10048                                         nft_use_dec(&trans->ctx.table->use);
10049                         }
10050                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10051                                              NFT_MSG_NEWSET, GFP_KERNEL);
10052                         nft_trans_destroy(trans);
10053                         break;
10054                 case NFT_MSG_DELSET:
10055                 case NFT_MSG_DESTROYSET:
10056                         nft_trans_set(trans)->dead = 1;
10057                         list_del_rcu(&nft_trans_set(trans)->list);
10058                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10059                                              trans->msg_type, GFP_KERNEL);
10060                         break;
10061                 case NFT_MSG_NEWSETELEM:
10062                         te = (struct nft_trans_elem *)trans->data;
10063
10064                         nft_setelem_activate(net, te->set, &te->elem);
10065                         nf_tables_setelem_notify(&trans->ctx, te->set,
10066                                                  &te->elem,
10067                                                  NFT_MSG_NEWSETELEM);
10068                         if (te->set->ops->commit &&
10069                             list_empty(&te->set->pending_update)) {
10070                                 list_add_tail(&te->set->pending_update,
10071                                               &set_update_list);
10072                         }
10073                         nft_trans_destroy(trans);
10074                         break;
10075                 case NFT_MSG_DELSETELEM:
10076                 case NFT_MSG_DESTROYSETELEM:
10077                         te = (struct nft_trans_elem *)trans->data;
10078
10079                         nf_tables_setelem_notify(&trans->ctx, te->set,
10080                                                  &te->elem,
10081                                                  trans->msg_type);
10082                         nft_setelem_remove(net, te->set, &te->elem);
10083                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
10084                                 atomic_dec(&te->set->nelems);
10085                                 te->set->ndeact--;
10086                         }
10087                         if (te->set->ops->commit &&
10088                             list_empty(&te->set->pending_update)) {
10089                                 list_add_tail(&te->set->pending_update,
10090                                               &set_update_list);
10091                         }
10092                         break;
10093                 case NFT_MSG_NEWOBJ:
10094                         if (nft_trans_obj_update(trans)) {
10095                                 nft_obj_commit_update(trans);
10096                                 nf_tables_obj_notify(&trans->ctx,
10097                                                      nft_trans_obj(trans),
10098                                                      NFT_MSG_NEWOBJ);
10099                         } else {
10100                                 nft_clear(net, nft_trans_obj(trans));
10101                                 nf_tables_obj_notify(&trans->ctx,
10102                                                      nft_trans_obj(trans),
10103                                                      NFT_MSG_NEWOBJ);
10104                                 nft_trans_destroy(trans);
10105                         }
10106                         break;
10107                 case NFT_MSG_DELOBJ:
10108                 case NFT_MSG_DESTROYOBJ:
10109                         nft_obj_del(nft_trans_obj(trans));
10110                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10111                                              trans->msg_type);
10112                         break;
10113                 case NFT_MSG_NEWFLOWTABLE:
10114                         if (nft_trans_flowtable_update(trans)) {
10115                                 nft_trans_flowtable(trans)->data.flags =
10116                                         nft_trans_flowtable_flags(trans);
10117                                 nf_tables_flowtable_notify(&trans->ctx,
10118                                                            nft_trans_flowtable(trans),
10119                                                            &nft_trans_flowtable_hooks(trans),
10120                                                            NFT_MSG_NEWFLOWTABLE);
10121                                 list_splice(&nft_trans_flowtable_hooks(trans),
10122                                             &nft_trans_flowtable(trans)->hook_list);
10123                         } else {
10124                                 nft_clear(net, nft_trans_flowtable(trans));
10125                                 nf_tables_flowtable_notify(&trans->ctx,
10126                                                            nft_trans_flowtable(trans),
10127                                                            NULL,
10128                                                            NFT_MSG_NEWFLOWTABLE);
10129                         }
10130                         nft_trans_destroy(trans);
10131                         break;
10132                 case NFT_MSG_DELFLOWTABLE:
10133                 case NFT_MSG_DESTROYFLOWTABLE:
10134                         if (nft_trans_flowtable_update(trans)) {
10135                                 nf_tables_flowtable_notify(&trans->ctx,
10136                                                            nft_trans_flowtable(trans),
10137                                                            &nft_trans_flowtable_hooks(trans),
10138                                                            trans->msg_type);
10139                                 nft_unregister_flowtable_net_hooks(net,
10140                                                                    &nft_trans_flowtable_hooks(trans));
10141                         } else {
10142                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10143                                 nf_tables_flowtable_notify(&trans->ctx,
10144                                                            nft_trans_flowtable(trans),
10145                                                            NULL,
10146                                                            trans->msg_type);
10147                                 nft_unregister_flowtable_net_hooks(net,
10148                                                 &nft_trans_flowtable(trans)->hook_list);
10149                         }
10150                         break;
10151                 }
10152         }
10153
10154         nft_set_commit_update(&set_update_list);
10155
10156         nft_commit_notify(net, NETLINK_CB(skb).portid);
10157         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10158         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10159
10160         nft_gc_seq_end(nft_net, gc_seq);
10161         nft_net->validate_state = NFT_VALIDATE_SKIP;
10162         nf_tables_commit_release(net);
10163
10164         return 0;
10165 }
10166
10167 static void nf_tables_module_autoload(struct net *net)
10168 {
10169         struct nftables_pernet *nft_net = nft_pernet(net);
10170         struct nft_module_request *req, *next;
10171         LIST_HEAD(module_list);
10172
10173         list_splice_init(&nft_net->module_list, &module_list);
10174         mutex_unlock(&nft_net->commit_mutex);
10175         list_for_each_entry_safe(req, next, &module_list, list) {
10176                 request_module("%s", req->module);
10177                 req->done = true;
10178         }
10179         mutex_lock(&nft_net->commit_mutex);
10180         list_splice(&module_list, &nft_net->module_list);
10181 }
10182
10183 static void nf_tables_abort_release(struct nft_trans *trans)
10184 {
10185         switch (trans->msg_type) {
10186         case NFT_MSG_NEWTABLE:
10187                 nf_tables_table_destroy(&trans->ctx);
10188                 break;
10189         case NFT_MSG_NEWCHAIN:
10190                 if (nft_trans_chain_update(trans))
10191                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10192                 else
10193                         nf_tables_chain_destroy(&trans->ctx);
10194                 break;
10195         case NFT_MSG_NEWRULE:
10196                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10197                 break;
10198         case NFT_MSG_NEWSET:
10199                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10200                 break;
10201         case NFT_MSG_NEWSETELEM:
10202                 nft_set_elem_destroy(nft_trans_elem_set(trans),
10203                                      nft_trans_elem(trans).priv, true);
10204                 break;
10205         case NFT_MSG_NEWOBJ:
10206                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10207                 break;
10208         case NFT_MSG_NEWFLOWTABLE:
10209                 if (nft_trans_flowtable_update(trans))
10210                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10211                 else
10212                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10213                 break;
10214         }
10215         kfree(trans);
10216 }
10217
10218 static void nft_set_abort_update(struct list_head *set_update_list)
10219 {
10220         struct nft_set *set, *next;
10221
10222         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10223                 list_del_init(&set->pending_update);
10224
10225                 if (!set->ops->abort)
10226                         continue;
10227
10228                 set->ops->abort(set);
10229         }
10230 }
10231
10232 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10233 {
10234         struct nftables_pernet *nft_net = nft_pernet(net);
10235         struct nft_trans *trans, *next;
10236         LIST_HEAD(set_update_list);
10237         struct nft_trans_elem *te;
10238
10239         if (action == NFNL_ABORT_VALIDATE &&
10240             nf_tables_validate(net) < 0)
10241                 return -EAGAIN;
10242
10243         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10244                                          list) {
10245                 switch (trans->msg_type) {
10246                 case NFT_MSG_NEWTABLE:
10247                         if (nft_trans_table_update(trans)) {
10248                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10249                                         nft_trans_destroy(trans);
10250                                         break;
10251                                 }
10252                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10253                                         nf_tables_table_disable(net, trans->ctx.table);
10254                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10255                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10256                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10257                                 }
10258                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10259                                 nft_trans_destroy(trans);
10260                         } else {
10261                                 list_del_rcu(&trans->ctx.table->list);
10262                         }
10263                         break;
10264                 case NFT_MSG_DELTABLE:
10265                 case NFT_MSG_DESTROYTABLE:
10266                         nft_clear(trans->ctx.net, trans->ctx.table);
10267                         nft_trans_destroy(trans);
10268                         break;
10269                 case NFT_MSG_NEWCHAIN:
10270                         if (nft_trans_chain_update(trans)) {
10271                                 nft_netdev_unregister_hooks(net,
10272                                                             &nft_trans_chain_hooks(trans),
10273                                                             true);
10274                                 free_percpu(nft_trans_chain_stats(trans));
10275                                 kfree(nft_trans_chain_name(trans));
10276                                 nft_trans_destroy(trans);
10277                         } else {
10278                                 if (nft_trans_chain_bound(trans)) {
10279                                         nft_trans_destroy(trans);
10280                                         break;
10281                                 }
10282                                 nft_use_dec_restore(&trans->ctx.table->use);
10283                                 nft_chain_del(trans->ctx.chain);
10284                                 nf_tables_unregister_hook(trans->ctx.net,
10285                                                           trans->ctx.table,
10286                                                           trans->ctx.chain);
10287                         }
10288                         break;
10289                 case NFT_MSG_DELCHAIN:
10290                 case NFT_MSG_DESTROYCHAIN:
10291                         if (nft_trans_chain_update(trans)) {
10292                                 list_splice(&nft_trans_chain_hooks(trans),
10293                                             &nft_trans_basechain(trans)->hook_list);
10294                         } else {
10295                                 nft_use_inc_restore(&trans->ctx.table->use);
10296                                 nft_clear(trans->ctx.net, trans->ctx.chain);
10297                         }
10298                         nft_trans_destroy(trans);
10299                         break;
10300                 case NFT_MSG_NEWRULE:
10301                         if (nft_trans_rule_bound(trans)) {
10302                                 nft_trans_destroy(trans);
10303                                 break;
10304                         }
10305                         nft_use_dec_restore(&trans->ctx.chain->use);
10306                         list_del_rcu(&nft_trans_rule(trans)->list);
10307                         nft_rule_expr_deactivate(&trans->ctx,
10308                                                  nft_trans_rule(trans),
10309                                                  NFT_TRANS_ABORT);
10310                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10311                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10312                         break;
10313                 case NFT_MSG_DELRULE:
10314                 case NFT_MSG_DESTROYRULE:
10315                         nft_use_inc_restore(&trans->ctx.chain->use);
10316                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10317                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10318                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10319                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10320
10321                         nft_trans_destroy(trans);
10322                         break;
10323                 case NFT_MSG_NEWSET:
10324                         if (nft_trans_set_update(trans)) {
10325                                 nft_trans_destroy(trans);
10326                                 break;
10327                         }
10328                         nft_use_dec_restore(&trans->ctx.table->use);
10329                         if (nft_trans_set_bound(trans)) {
10330                                 nft_trans_destroy(trans);
10331                                 break;
10332                         }
10333                         list_del_rcu(&nft_trans_set(trans)->list);
10334                         break;
10335                 case NFT_MSG_DELSET:
10336                 case NFT_MSG_DESTROYSET:
10337                         nft_use_inc_restore(&trans->ctx.table->use);
10338                         nft_clear(trans->ctx.net, nft_trans_set(trans));
10339                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10340                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10341
10342                         nft_trans_destroy(trans);
10343                         break;
10344                 case NFT_MSG_NEWSETELEM:
10345                         if (nft_trans_elem_set_bound(trans)) {
10346                                 nft_trans_destroy(trans);
10347                                 break;
10348                         }
10349                         te = (struct nft_trans_elem *)trans->data;
10350                         if (!te->set->ops->abort ||
10351                             nft_setelem_is_catchall(te->set, &te->elem))
10352                                 nft_setelem_remove(net, te->set, &te->elem);
10353
10354                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10355                                 atomic_dec(&te->set->nelems);
10356
10357                         if (te->set->ops->abort &&
10358                             list_empty(&te->set->pending_update)) {
10359                                 list_add_tail(&te->set->pending_update,
10360                                               &set_update_list);
10361                         }
10362                         break;
10363                 case NFT_MSG_DELSETELEM:
10364                 case NFT_MSG_DESTROYSETELEM:
10365                         te = (struct nft_trans_elem *)trans->data;
10366
10367                         nft_setelem_data_activate(net, te->set, &te->elem);
10368                         nft_setelem_activate(net, te->set, &te->elem);
10369                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10370                                 te->set->ndeact--;
10371
10372                         if (te->set->ops->abort &&
10373                             list_empty(&te->set->pending_update)) {
10374                                 list_add_tail(&te->set->pending_update,
10375                                               &set_update_list);
10376                         }
10377                         nft_trans_destroy(trans);
10378                         break;
10379                 case NFT_MSG_NEWOBJ:
10380                         if (nft_trans_obj_update(trans)) {
10381                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10382                                 nft_trans_destroy(trans);
10383                         } else {
10384                                 nft_use_dec_restore(&trans->ctx.table->use);
10385                                 nft_obj_del(nft_trans_obj(trans));
10386                         }
10387                         break;
10388                 case NFT_MSG_DELOBJ:
10389                 case NFT_MSG_DESTROYOBJ:
10390                         nft_use_inc_restore(&trans->ctx.table->use);
10391                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
10392                         nft_trans_destroy(trans);
10393                         break;
10394                 case NFT_MSG_NEWFLOWTABLE:
10395                         if (nft_trans_flowtable_update(trans)) {
10396                                 nft_unregister_flowtable_net_hooks(net,
10397                                                 &nft_trans_flowtable_hooks(trans));
10398                         } else {
10399                                 nft_use_dec_restore(&trans->ctx.table->use);
10400                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10401                                 nft_unregister_flowtable_net_hooks(net,
10402                                                 &nft_trans_flowtable(trans)->hook_list);
10403                         }
10404                         break;
10405                 case NFT_MSG_DELFLOWTABLE:
10406                 case NFT_MSG_DESTROYFLOWTABLE:
10407                         if (nft_trans_flowtable_update(trans)) {
10408                                 list_splice(&nft_trans_flowtable_hooks(trans),
10409                                             &nft_trans_flowtable(trans)->hook_list);
10410                         } else {
10411                                 nft_use_inc_restore(&trans->ctx.table->use);
10412                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10413                         }
10414                         nft_trans_destroy(trans);
10415                         break;
10416                 }
10417         }
10418
10419         nft_set_abort_update(&set_update_list);
10420
10421         synchronize_rcu();
10422
10423         list_for_each_entry_safe_reverse(trans, next,
10424                                          &nft_net->commit_list, list) {
10425                 nft_trans_list_del(trans);
10426                 nf_tables_abort_release(trans);
10427         }
10428
10429         if (action == NFNL_ABORT_AUTOLOAD)
10430                 nf_tables_module_autoload(net);
10431         else
10432                 nf_tables_module_autoload_cleanup(net);
10433
10434         return 0;
10435 }
10436
10437 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10438                            enum nfnl_abort_action action)
10439 {
10440         struct nftables_pernet *nft_net = nft_pernet(net);
10441         unsigned int gc_seq;
10442         int ret;
10443
10444         gc_seq = nft_gc_seq_begin(nft_net);
10445         ret = __nf_tables_abort(net, action);
10446         nft_gc_seq_end(nft_net, gc_seq);
10447         mutex_unlock(&nft_net->commit_mutex);
10448
10449         return ret;
10450 }
10451
10452 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10453 {
10454         struct nftables_pernet *nft_net = nft_pernet(net);
10455         bool genid_ok;
10456
10457         mutex_lock(&nft_net->commit_mutex);
10458
10459         genid_ok = genid == 0 || nft_net->base_seq == genid;
10460         if (!genid_ok)
10461                 mutex_unlock(&nft_net->commit_mutex);
10462
10463         /* else, commit mutex has to be released by commit or abort function */
10464         return genid_ok;
10465 }
10466
10467 static const struct nfnetlink_subsystem nf_tables_subsys = {
10468         .name           = "nf_tables",
10469         .subsys_id      = NFNL_SUBSYS_NFTABLES,
10470         .cb_count       = NFT_MSG_MAX,
10471         .cb             = nf_tables_cb,
10472         .commit         = nf_tables_commit,
10473         .abort          = nf_tables_abort,
10474         .valid_genid    = nf_tables_valid_genid,
10475         .owner          = THIS_MODULE,
10476 };
10477
10478 int nft_chain_validate_dependency(const struct nft_chain *chain,
10479                                   enum nft_chain_types type)
10480 {
10481         const struct nft_base_chain *basechain;
10482
10483         if (nft_is_base_chain(chain)) {
10484                 basechain = nft_base_chain(chain);
10485                 if (basechain->type->type != type)
10486                         return -EOPNOTSUPP;
10487         }
10488         return 0;
10489 }
10490 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10491
10492 int nft_chain_validate_hooks(const struct nft_chain *chain,
10493                              unsigned int hook_flags)
10494 {
10495         struct nft_base_chain *basechain;
10496
10497         if (nft_is_base_chain(chain)) {
10498                 basechain = nft_base_chain(chain);
10499
10500                 if ((1 << basechain->ops.hooknum) & hook_flags)
10501                         return 0;
10502
10503                 return -EOPNOTSUPP;
10504         }
10505
10506         return 0;
10507 }
10508 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10509
10510 /*
10511  * Loop detection - walk through the ruleset beginning at the destination chain
10512  * of a new jump until either the source chain is reached (loop) or all
10513  * reachable chains have been traversed.
10514  *
10515  * The loop check is performed whenever a new jump verdict is added to an
10516  * expression or verdict map or a verdict map is bound to a new chain.
10517  */
10518
10519 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10520                                  const struct nft_chain *chain);
10521
10522 static int nft_check_loops(const struct nft_ctx *ctx,
10523                            const struct nft_set_ext *ext)
10524 {
10525         const struct nft_data *data;
10526         int ret;
10527
10528         data = nft_set_ext_data(ext);
10529         switch (data->verdict.code) {
10530         case NFT_JUMP:
10531         case NFT_GOTO:
10532                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10533                 break;
10534         default:
10535                 ret = 0;
10536                 break;
10537         }
10538
10539         return ret;
10540 }
10541
10542 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10543                                         struct nft_set *set,
10544                                         const struct nft_set_iter *iter,
10545                                         struct nft_set_elem *elem)
10546 {
10547         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10548
10549         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10550             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10551                 return 0;
10552
10553         return nft_check_loops(ctx, ext);
10554 }
10555
10556 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10557                                   struct nft_set *set)
10558 {
10559         u8 genmask = nft_genmask_next(ctx->net);
10560         struct nft_set_elem_catchall *catchall;
10561         struct nft_set_ext *ext;
10562         int ret = 0;
10563
10564         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10565                 ext = nft_set_elem_ext(set, catchall->elem);
10566                 if (!nft_set_elem_active(ext, genmask))
10567                         continue;
10568
10569                 ret = nft_check_loops(ctx, ext);
10570                 if (ret < 0)
10571                         return ret;
10572         }
10573
10574         return ret;
10575 }
10576
10577 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10578                                  const struct nft_chain *chain)
10579 {
10580         const struct nft_rule *rule;
10581         const struct nft_expr *expr, *last;
10582         struct nft_set *set;
10583         struct nft_set_binding *binding;
10584         struct nft_set_iter iter;
10585
10586         if (ctx->chain == chain)
10587                 return -ELOOP;
10588
10589         if (fatal_signal_pending(current))
10590                 return -EINTR;
10591
10592         list_for_each_entry(rule, &chain->rules, list) {
10593                 nft_rule_for_each_expr(expr, last, rule) {
10594                         struct nft_immediate_expr *priv;
10595                         const struct nft_data *data;
10596                         int err;
10597
10598                         if (strcmp(expr->ops->type->name, "immediate"))
10599                                 continue;
10600
10601                         priv = nft_expr_priv(expr);
10602                         if (priv->dreg != NFT_REG_VERDICT)
10603                                 continue;
10604
10605                         data = &priv->data;
10606                         switch (data->verdict.code) {
10607                         case NFT_JUMP:
10608                         case NFT_GOTO:
10609                                 err = nf_tables_check_loops(ctx,
10610                                                         data->verdict.chain);
10611                                 if (err < 0)
10612                                         return err;
10613                                 break;
10614                         default:
10615                                 break;
10616                         }
10617                 }
10618         }
10619
10620         list_for_each_entry(set, &ctx->table->sets, list) {
10621                 if (!nft_is_active_next(ctx->net, set))
10622                         continue;
10623                 if (!(set->flags & NFT_SET_MAP) ||
10624                     set->dtype != NFT_DATA_VERDICT)
10625                         continue;
10626
10627                 list_for_each_entry(binding, &set->bindings, list) {
10628                         if (!(binding->flags & NFT_SET_MAP) ||
10629                             binding->chain != chain)
10630                                 continue;
10631
10632                         iter.genmask    = nft_genmask_next(ctx->net);
10633                         iter.skip       = 0;
10634                         iter.count      = 0;
10635                         iter.err        = 0;
10636                         iter.fn         = nf_tables_loop_check_setelem;
10637
10638                         set->ops->walk(ctx, set, &iter);
10639                         if (!iter.err)
10640                                 iter.err = nft_set_catchall_loops(ctx, set);
10641
10642                         if (iter.err < 0)
10643                                 return iter.err;
10644                 }
10645         }
10646
10647         return 0;
10648 }
10649
10650 /**
10651  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
10652  *
10653  *      @attr: netlink attribute to fetch value from
10654  *      @max: maximum value to be stored in dest
10655  *      @dest: pointer to the variable
10656  *
10657  *      Parse, check and store a given u32 netlink attribute into variable.
10658  *      This function returns -ERANGE if the value goes over maximum value.
10659  *      Otherwise a 0 is returned and the attribute value is stored in the
10660  *      destination variable.
10661  */
10662 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10663 {
10664         u32 val;
10665
10666         val = ntohl(nla_get_be32(attr));
10667         if (val > max)
10668                 return -ERANGE;
10669
10670         *dest = val;
10671         return 0;
10672 }
10673 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10674
10675 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10676 {
10677         unsigned int reg;
10678
10679         reg = ntohl(nla_get_be32(attr));
10680         switch (reg) {
10681         case NFT_REG_VERDICT...NFT_REG_4:
10682                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10683                 break;
10684         case NFT_REG32_00...NFT_REG32_15:
10685                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10686                 break;
10687         default:
10688                 return -ERANGE;
10689         }
10690
10691         return 0;
10692 }
10693
10694 /**
10695  *      nft_dump_register - dump a register value to a netlink attribute
10696  *
10697  *      @skb: socket buffer
10698  *      @attr: attribute number
10699  *      @reg: register number
10700  *
10701  *      Construct a netlink attribute containing the register number. For
10702  *      compatibility reasons, register numbers being a multiple of 4 are
10703  *      translated to the corresponding 128 bit register numbers.
10704  */
10705 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10706 {
10707         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10708                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10709         else
10710                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10711
10712         return nla_put_be32(skb, attr, htonl(reg));
10713 }
10714 EXPORT_SYMBOL_GPL(nft_dump_register);
10715
10716 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10717 {
10718         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10719                 return -EINVAL;
10720         if (len == 0)
10721                 return -EINVAL;
10722         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10723                 return -ERANGE;
10724
10725         return 0;
10726 }
10727
10728 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10729 {
10730         u32 reg;
10731         int err;
10732
10733         err = nft_parse_register(attr, &reg);
10734         if (err < 0)
10735                 return err;
10736
10737         err = nft_validate_register_load(reg, len);
10738         if (err < 0)
10739                 return err;
10740
10741         *sreg = reg;
10742         return 0;
10743 }
10744 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10745
10746 static int nft_validate_register_store(const struct nft_ctx *ctx,
10747                                        enum nft_registers reg,
10748                                        const struct nft_data *data,
10749                                        enum nft_data_types type,
10750                                        unsigned int len)
10751 {
10752         int err;
10753
10754         switch (reg) {
10755         case NFT_REG_VERDICT:
10756                 if (type != NFT_DATA_VERDICT)
10757                         return -EINVAL;
10758
10759                 if (data != NULL &&
10760                     (data->verdict.code == NFT_GOTO ||
10761                      data->verdict.code == NFT_JUMP)) {
10762                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10763                         if (err < 0)
10764                                 return err;
10765                 }
10766
10767                 return 0;
10768         default:
10769                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10770                         return -EINVAL;
10771                 if (len == 0)
10772                         return -EINVAL;
10773                 if (reg * NFT_REG32_SIZE + len >
10774                     sizeof_field(struct nft_regs, data))
10775                         return -ERANGE;
10776
10777                 if (data != NULL && type != NFT_DATA_VALUE)
10778                         return -EINVAL;
10779                 return 0;
10780         }
10781 }
10782
10783 int nft_parse_register_store(const struct nft_ctx *ctx,
10784                              const struct nlattr *attr, u8 *dreg,
10785                              const struct nft_data *data,
10786                              enum nft_data_types type, unsigned int len)
10787 {
10788         int err;
10789         u32 reg;
10790
10791         err = nft_parse_register(attr, &reg);
10792         if (err < 0)
10793                 return err;
10794
10795         err = nft_validate_register_store(ctx, reg, data, type, len);
10796         if (err < 0)
10797                 return err;
10798
10799         *dreg = reg;
10800         return 0;
10801 }
10802 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10803
10804 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10805         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10806         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10807                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10808         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10809 };
10810
10811 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10812                             struct nft_data_desc *desc, const struct nlattr *nla)
10813 {
10814         u8 genmask = nft_genmask_next(ctx->net);
10815         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10816         struct nft_chain *chain;
10817         int err;
10818
10819         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10820                                           nft_verdict_policy, NULL);
10821         if (err < 0)
10822                 return err;
10823
10824         if (!tb[NFTA_VERDICT_CODE])
10825                 return -EINVAL;
10826
10827         /* zero padding hole for memcmp */
10828         memset(data, 0, sizeof(*data));
10829         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10830
10831         switch (data->verdict.code) {
10832         default:
10833                 switch (data->verdict.code & NF_VERDICT_MASK) {
10834                 case NF_ACCEPT:
10835                 case NF_DROP:
10836                 case NF_QUEUE:
10837                         break;
10838                 default:
10839                         return -EINVAL;
10840                 }
10841                 fallthrough;
10842         case NFT_CONTINUE:
10843         case NFT_BREAK:
10844         case NFT_RETURN:
10845                 break;
10846         case NFT_JUMP:
10847         case NFT_GOTO:
10848                 if (tb[NFTA_VERDICT_CHAIN]) {
10849                         chain = nft_chain_lookup(ctx->net, ctx->table,
10850                                                  tb[NFTA_VERDICT_CHAIN],
10851                                                  genmask);
10852                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10853                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10854                                                       tb[NFTA_VERDICT_CHAIN_ID],
10855                                                       genmask);
10856                         if (IS_ERR(chain))
10857                                 return PTR_ERR(chain);
10858                 } else {
10859                         return -EINVAL;
10860                 }
10861
10862                 if (IS_ERR(chain))
10863                         return PTR_ERR(chain);
10864                 if (nft_is_base_chain(chain))
10865                         return -EOPNOTSUPP;
10866                 if (nft_chain_is_bound(chain))
10867                         return -EINVAL;
10868                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10869                     chain->flags & NFT_CHAIN_BINDING)
10870                         return -EINVAL;
10871                 if (!nft_use_inc(&chain->use))
10872                         return -EMFILE;
10873
10874                 data->verdict.chain = chain;
10875                 break;
10876         }
10877
10878         desc->len = sizeof(data->verdict);
10879
10880         return 0;
10881 }
10882
10883 static void nft_verdict_uninit(const struct nft_data *data)
10884 {
10885         struct nft_chain *chain;
10886
10887         switch (data->verdict.code) {
10888         case NFT_JUMP:
10889         case NFT_GOTO:
10890                 chain = data->verdict.chain;
10891                 nft_use_dec(&chain->use);
10892                 break;
10893         }
10894 }
10895
10896 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10897 {
10898         struct nlattr *nest;
10899
10900         nest = nla_nest_start_noflag(skb, type);
10901         if (!nest)
10902                 goto nla_put_failure;
10903
10904         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10905                 goto nla_put_failure;
10906
10907         switch (v->code) {
10908         case NFT_JUMP:
10909         case NFT_GOTO:
10910                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10911                                    v->chain->name))
10912                         goto nla_put_failure;
10913         }
10914         nla_nest_end(skb, nest);
10915         return 0;
10916
10917 nla_put_failure:
10918         return -1;
10919 }
10920
10921 static int nft_value_init(const struct nft_ctx *ctx,
10922                           struct nft_data *data, struct nft_data_desc *desc,
10923                           const struct nlattr *nla)
10924 {
10925         unsigned int len;
10926
10927         len = nla_len(nla);
10928         if (len == 0)
10929                 return -EINVAL;
10930         if (len > desc->size)
10931                 return -EOVERFLOW;
10932         if (desc->len) {
10933                 if (len != desc->len)
10934                         return -EINVAL;
10935         } else {
10936                 desc->len = len;
10937         }
10938
10939         nla_memcpy(data->data, nla, len);
10940
10941         return 0;
10942 }
10943
10944 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10945                           unsigned int len)
10946 {
10947         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10948 }
10949
10950 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10951         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10952         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10953 };
10954
10955 /**
10956  *      nft_data_init - parse nf_tables data netlink attributes
10957  *
10958  *      @ctx: context of the expression using the data
10959  *      @data: destination struct nft_data
10960  *      @desc: data description
10961  *      @nla: netlink attribute containing data
10962  *
10963  *      Parse the netlink data attributes and initialize a struct nft_data.
10964  *      The type and length of data are returned in the data description.
10965  *
10966  *      The caller can indicate that it only wants to accept data of type
10967  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10968  */
10969 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10970                   struct nft_data_desc *desc, const struct nlattr *nla)
10971 {
10972         struct nlattr *tb[NFTA_DATA_MAX + 1];
10973         int err;
10974
10975         if (WARN_ON_ONCE(!desc->size))
10976                 return -EINVAL;
10977
10978         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10979                                           nft_data_policy, NULL);
10980         if (err < 0)
10981                 return err;
10982
10983         if (tb[NFTA_DATA_VALUE]) {
10984                 if (desc->type != NFT_DATA_VALUE)
10985                         return -EINVAL;
10986
10987                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10988         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10989                 if (desc->type != NFT_DATA_VERDICT)
10990                         return -EINVAL;
10991
10992                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10993         } else {
10994                 err = -EINVAL;
10995         }
10996
10997         return err;
10998 }
10999 EXPORT_SYMBOL_GPL(nft_data_init);
11000
11001 /**
11002  *      nft_data_release - release a nft_data item
11003  *
11004  *      @data: struct nft_data to release
11005  *      @type: type of data
11006  *
11007  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11008  *      all others need to be released by calling this function.
11009  */
11010 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11011 {
11012         if (type < NFT_DATA_VERDICT)
11013                 return;
11014         switch (type) {
11015         case NFT_DATA_VERDICT:
11016                 return nft_verdict_uninit(data);
11017         default:
11018                 WARN_ON(1);
11019         }
11020 }
11021 EXPORT_SYMBOL_GPL(nft_data_release);
11022
11023 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11024                   enum nft_data_types type, unsigned int len)
11025 {
11026         struct nlattr *nest;
11027         int err;
11028
11029         nest = nla_nest_start_noflag(skb, attr);
11030         if (nest == NULL)
11031                 return -1;
11032
11033         switch (type) {
11034         case NFT_DATA_VALUE:
11035                 err = nft_value_dump(skb, data, len);
11036                 break;
11037         case NFT_DATA_VERDICT:
11038                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11039                 break;
11040         default:
11041                 err = -EINVAL;
11042                 WARN_ON(1);
11043         }
11044
11045         nla_nest_end(skb, nest);
11046         return err;
11047 }
11048 EXPORT_SYMBOL_GPL(nft_data_dump);
11049
11050 int __nft_release_basechain(struct nft_ctx *ctx)
11051 {
11052         struct nft_rule *rule, *nr;
11053
11054         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11055                 return 0;
11056
11057         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11058         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11059                 list_del(&rule->list);
11060                 nft_use_dec(&ctx->chain->use);
11061                 nf_tables_rule_release(ctx, rule);
11062         }
11063         nft_chain_del(ctx->chain);
11064         nft_use_dec(&ctx->table->use);
11065         nf_tables_chain_destroy(ctx);
11066
11067         return 0;
11068 }
11069 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11070
11071 static void __nft_release_hook(struct net *net, struct nft_table *table)
11072 {
11073         struct nft_flowtable *flowtable;
11074         struct nft_chain *chain;
11075
11076         list_for_each_entry(chain, &table->chains, list)
11077                 __nf_tables_unregister_hook(net, table, chain, true);
11078         list_for_each_entry(flowtable, &table->flowtables, list)
11079                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11080                                                      true);
11081 }
11082
11083 static void __nft_release_hooks(struct net *net)
11084 {
11085         struct nftables_pernet *nft_net = nft_pernet(net);
11086         struct nft_table *table;
11087
11088         list_for_each_entry(table, &nft_net->tables, list) {
11089                 if (nft_table_has_owner(table))
11090                         continue;
11091
11092                 __nft_release_hook(net, table);
11093         }
11094 }
11095
11096 static void __nft_release_table(struct net *net, struct nft_table *table)
11097 {
11098         struct nft_flowtable *flowtable, *nf;
11099         struct nft_chain *chain, *nc;
11100         struct nft_object *obj, *ne;
11101         struct nft_rule *rule, *nr;
11102         struct nft_set *set, *ns;
11103         struct nft_ctx ctx = {
11104                 .net    = net,
11105                 .family = NFPROTO_NETDEV,
11106         };
11107
11108         ctx.family = table->family;
11109         ctx.table = table;
11110         list_for_each_entry(chain, &table->chains, list) {
11111                 if (nft_chain_binding(chain))
11112                         continue;
11113
11114                 ctx.chain = chain;
11115                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11116                         list_del(&rule->list);
11117                         nft_use_dec(&chain->use);
11118                         nf_tables_rule_release(&ctx, rule);
11119                 }
11120         }
11121         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11122                 list_del(&flowtable->list);
11123                 nft_use_dec(&table->use);
11124                 nf_tables_flowtable_destroy(flowtable);
11125         }
11126         list_for_each_entry_safe(set, ns, &table->sets, list) {
11127                 list_del(&set->list);
11128                 nft_use_dec(&table->use);
11129                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11130                         nft_map_deactivate(&ctx, set);
11131
11132                 nft_set_destroy(&ctx, set);
11133         }
11134         list_for_each_entry_safe(obj, ne, &table->objects, list) {
11135                 nft_obj_del(obj);
11136                 nft_use_dec(&table->use);
11137                 nft_obj_destroy(&ctx, obj);
11138         }
11139         list_for_each_entry_safe(chain, nc, &table->chains, list) {
11140                 ctx.chain = chain;
11141                 nft_chain_del(chain);
11142                 nft_use_dec(&table->use);
11143                 nf_tables_chain_destroy(&ctx);
11144         }
11145         nf_tables_table_destroy(&ctx);
11146 }
11147
11148 static void __nft_release_tables(struct net *net)
11149 {
11150         struct nftables_pernet *nft_net = nft_pernet(net);
11151         struct nft_table *table, *nt;
11152
11153         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11154                 if (nft_table_has_owner(table))
11155                         continue;
11156
11157                 list_del(&table->list);
11158
11159                 __nft_release_table(net, table);
11160         }
11161 }
11162
11163 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11164                             void *ptr)
11165 {
11166         struct nft_table *table, *to_delete[8];
11167         struct nftables_pernet *nft_net;
11168         struct netlink_notify *n = ptr;
11169         struct net *net = n->net;
11170         unsigned int deleted;
11171         bool restart = false;
11172         unsigned int gc_seq;
11173
11174         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11175                 return NOTIFY_DONE;
11176
11177         nft_net = nft_pernet(net);
11178         deleted = 0;
11179         mutex_lock(&nft_net->commit_mutex);
11180
11181         gc_seq = nft_gc_seq_begin(nft_net);
11182
11183         if (!list_empty(&nf_tables_destroy_list))
11184                 nf_tables_trans_destroy_flush_work();
11185 again:
11186         list_for_each_entry(table, &nft_net->tables, list) {
11187                 if (nft_table_has_owner(table) &&
11188                     n->portid == table->nlpid) {
11189                         __nft_release_hook(net, table);
11190                         list_del_rcu(&table->list);
11191                         to_delete[deleted++] = table;
11192                         if (deleted >= ARRAY_SIZE(to_delete))
11193                                 break;
11194                 }
11195         }
11196         if (deleted) {
11197                 restart = deleted >= ARRAY_SIZE(to_delete);
11198                 synchronize_rcu();
11199                 while (deleted)
11200                         __nft_release_table(net, to_delete[--deleted]);
11201
11202                 if (restart)
11203                         goto again;
11204         }
11205         nft_gc_seq_end(nft_net, gc_seq);
11206
11207         mutex_unlock(&nft_net->commit_mutex);
11208
11209         return NOTIFY_DONE;
11210 }
11211
11212 static struct notifier_block nft_nl_notifier = {
11213         .notifier_call  = nft_rcv_nl_event,
11214 };
11215
11216 static int __net_init nf_tables_init_net(struct net *net)
11217 {
11218         struct nftables_pernet *nft_net = nft_pernet(net);
11219
11220         INIT_LIST_HEAD(&nft_net->tables);
11221         INIT_LIST_HEAD(&nft_net->commit_list);
11222         INIT_LIST_HEAD(&nft_net->binding_list);
11223         INIT_LIST_HEAD(&nft_net->module_list);
11224         INIT_LIST_HEAD(&nft_net->notify_list);
11225         mutex_init(&nft_net->commit_mutex);
11226         nft_net->base_seq = 1;
11227         nft_net->gc_seq = 0;
11228         nft_net->validate_state = NFT_VALIDATE_SKIP;
11229
11230         return 0;
11231 }
11232
11233 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11234 {
11235         struct nftables_pernet *nft_net = nft_pernet(net);
11236
11237         mutex_lock(&nft_net->commit_mutex);
11238         __nft_release_hooks(net);
11239         mutex_unlock(&nft_net->commit_mutex);
11240 }
11241
11242 static void __net_exit nf_tables_exit_net(struct net *net)
11243 {
11244         struct nftables_pernet *nft_net = nft_pernet(net);
11245         unsigned int gc_seq;
11246
11247         mutex_lock(&nft_net->commit_mutex);
11248
11249         gc_seq = nft_gc_seq_begin(nft_net);
11250
11251         if (!list_empty(&nft_net->commit_list) ||
11252             !list_empty(&nft_net->module_list))
11253                 __nf_tables_abort(net, NFNL_ABORT_NONE);
11254
11255         __nft_release_tables(net);
11256
11257         nft_gc_seq_end(nft_net, gc_seq);
11258
11259         mutex_unlock(&nft_net->commit_mutex);
11260         WARN_ON_ONCE(!list_empty(&nft_net->tables));
11261         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11262         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11263 }
11264
11265 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11266 {
11267         flush_work(&trans_gc_work);
11268 }
11269
11270 static struct pernet_operations nf_tables_net_ops = {
11271         .init           = nf_tables_init_net,
11272         .pre_exit       = nf_tables_pre_exit_net,
11273         .exit           = nf_tables_exit_net,
11274         .exit_batch     = nf_tables_exit_batch,
11275         .id             = &nf_tables_net_id,
11276         .size           = sizeof(struct nftables_pernet),
11277 };
11278
11279 static int __init nf_tables_module_init(void)
11280 {
11281         int err;
11282
11283         err = register_pernet_subsys(&nf_tables_net_ops);
11284         if (err < 0)
11285                 return err;
11286
11287         err = nft_chain_filter_init();
11288         if (err < 0)
11289                 goto err_chain_filter;
11290
11291         err = nf_tables_core_module_init();
11292         if (err < 0)
11293                 goto err_core_module;
11294
11295         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11296         if (err < 0)
11297                 goto err_netdev_notifier;
11298
11299         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11300         if (err < 0)
11301                 goto err_rht_objname;
11302
11303         err = nft_offload_init();
11304         if (err < 0)
11305                 goto err_offload;
11306
11307         err = netlink_register_notifier(&nft_nl_notifier);
11308         if (err < 0)
11309                 goto err_netlink_notifier;
11310
11311         /* must be last */
11312         err = nfnetlink_subsys_register(&nf_tables_subsys);
11313         if (err < 0)
11314                 goto err_nfnl_subsys;
11315
11316         nft_chain_route_init();
11317
11318         return err;
11319
11320 err_nfnl_subsys:
11321         netlink_unregister_notifier(&nft_nl_notifier);
11322 err_netlink_notifier:
11323         nft_offload_exit();
11324 err_offload:
11325         rhltable_destroy(&nft_objname_ht);
11326 err_rht_objname:
11327         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11328 err_netdev_notifier:
11329         nf_tables_core_module_exit();
11330 err_core_module:
11331         nft_chain_filter_fini();
11332 err_chain_filter:
11333         unregister_pernet_subsys(&nf_tables_net_ops);
11334         return err;
11335 }
11336
11337 static void __exit nf_tables_module_exit(void)
11338 {
11339         nfnetlink_subsys_unregister(&nf_tables_subsys);
11340         netlink_unregister_notifier(&nft_nl_notifier);
11341         nft_offload_exit();
11342         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11343         nft_chain_filter_fini();
11344         nft_chain_route_fini();
11345         unregister_pernet_subsys(&nf_tables_net_ops);
11346         cancel_work_sync(&trans_gc_work);
11347         cancel_work_sync(&trans_destroy_work);
11348         rcu_barrier();
11349         rhltable_destroy(&nft_objname_ht);
11350         nf_tables_core_module_exit();
11351 }
11352
11353 module_init(nf_tables_module_init);
11354 module_exit(nf_tables_module_exit);
11355
11356 MODULE_LICENSE("GPL");
11357 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11358 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);