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