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