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 static LIST_HEAD(nf_tables_expressions);
  29 static LIST_HEAD(nf_tables_objects);
  30 static LIST_HEAD(nf_tables_flowtables);
  31 static LIST_HEAD(nf_tables_destroy_list);
  32 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  33 static u64 table_handle;
  34
  35 enum {
  36         NFT_VALIDATE_SKIP       = 0,
  37         NFT_VALIDATE_NEED,
  38         NFT_VALIDATE_DO,
  39 };
  40
  41 static struct rhltable nft_objname_ht;
  42
  43 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  44 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  45 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  46
  47 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  48 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  49 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  50
  51 static const struct rhashtable_params nft_chain_ht_params = {
  52         .head_offset            = offsetof(struct nft_chain, rhlhead),
  53         .key_offset             = offsetof(struct nft_chain, name),
  54         .hashfn                 = nft_chain_hash,
  55         .obj_hashfn             = nft_chain_hash_obj,
  56         .obj_cmpfn              = nft_chain_hash_cmp,
  57         .automatic_shrinking    = true,
  58 };
  59
  60 static const struct rhashtable_params nft_objname_ht_params = {
  61         .head_offset            = offsetof(struct nft_object, rhlhead),
  62         .key_offset             = offsetof(struct nft_object, key),
  63         .hashfn                 = nft_objname_hash,
  64         .obj_hashfn             = nft_objname_hash_obj,
  65         .obj_cmpfn              = nft_objname_hash_cmp,
  66         .automatic_shrinking    = true,
  67 };
  68
  69 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
  70 {
  71         switch (net->nft.validate_state) {
  72         case NFT_VALIDATE_SKIP:
  73                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
  74                 break;
  75         case NFT_VALIDATE_NEED:
  76                 break;
  77         case NFT_VALIDATE_DO:
  78                 if (new_validate_state == NFT_VALIDATE_NEED)
  79                         return;
  80         }
  81
  82         net->nft.validate_state = new_validate_state;
  83 }
  84 static void nf_tables_trans_destroy_work(struct work_struct *w);
  85 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
  86
  87 static void nft_ctx_init(struct nft_ctx *ctx,
  88                          struct net *net,
  89                          const struct sk_buff *skb,
  90                          const struct nlmsghdr *nlh,
  91                          u8 family,
  92                          struct nft_table *table,
  93                          struct nft_chain *chain,
  94                          const struct nlattr * const *nla)
  95 {
  96         ctx->net        = net;
  97         ctx->family     = family;
  98         ctx->level      = 0;
  99         ctx->table      = table;
 100         ctx->chain      = chain;
 101         ctx->nla        = nla;
 102         ctx->portid     = NETLINK_CB(skb).portid;
 103         ctx->report     = nlmsg_report(nlh);
 104         ctx->flags      = nlh->nlmsg_flags;
 105         ctx->seq        = nlh->nlmsg_seq;
 106 }
 107
 108 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 109                                              int msg_type, u32 size, gfp_t gfp)
 110 {
 111         struct nft_trans *trans;
 112
 113         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 114         if (trans == NULL)
 115                 return NULL;
 116
 117         trans->msg_type = msg_type;
 118         trans->ctx      = *ctx;
 119
 120         return trans;
 121 }
 122
 123 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 124                                          int msg_type, u32 size)
 125 {
 126         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 127 }
 128
 129 static void nft_trans_destroy(struct nft_trans *trans)
 130 {
 131         list_del(&trans->list);
 132         kfree(trans);
 133 }
 134
 135 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 136 {
 137         struct net *net = ctx->net;
 138         struct nft_trans *trans;
 139
 140         if (!nft_set_is_anonymous(set))
 141                 return;
 142
 143         list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
 144                 switch (trans->msg_type) {
 145                 case NFT_MSG_NEWSET:
 146                         if (nft_trans_set(trans) == set)
 147                                 nft_trans_set_bound(trans) = true;
 148                         break;
 149                 case NFT_MSG_NEWSETELEM:
 150                         if (nft_trans_elem_set(trans) == set)
 151                                 nft_trans_elem_set_bound(trans) = true;
 152                         break;
 153                 }
 154         }
 155 }
 156
 157 static int nft_netdev_register_hooks(struct net *net,
 158                                      struct list_head *hook_list)
 159 {
 160         struct nft_hook *hook;
 161         int err, j;
 162
 163         j = 0;
 164         list_for_each_entry(hook, hook_list, list) {
 165                 err = nf_register_net_hook(net, &hook->ops);
 166                 if (err < 0)
 167                         goto err_register;
 168
 169                 j++;
 170         }
 171         return 0;
 172
 173 err_register:
 174         list_for_each_entry(hook, hook_list, list) {
 175                 if (j-- <= 0)
 176                         break;
 177
 178                 nf_unregister_net_hook(net, &hook->ops);
 179         }
 180         return err;
 181 }
 182
 183 static void nft_netdev_unregister_hooks(struct net *net,
 184                                         struct list_head *hook_list)
 185 {
 186         struct nft_hook *hook;
 187
 188         list_for_each_entry(hook, hook_list, list)
 189                 nf_unregister_net_hook(net, &hook->ops);
 190 }
 191
 192 static int nf_tables_register_hook(struct net *net,
 193                                    const struct nft_table *table,
 194                                    struct nft_chain *chain)
 195 {
 196         struct nft_base_chain *basechain;
 197         const struct nf_hook_ops *ops;
 198
 199         if (table->flags & NFT_TABLE_F_DORMANT ||
 200             !nft_is_base_chain(chain))
 201                 return 0;
 202
 203         basechain = nft_base_chain(chain);
 204         ops = &basechain->ops;
 205
 206         if (basechain->type->ops_register)
 207                 return basechain->type->ops_register(net, ops);
 208
 209         if (table->family == NFPROTO_NETDEV)
 210                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 211
 212         return nf_register_net_hook(net, &basechain->ops);
 213 }
 214
 215 static void nf_tables_unregister_hook(struct net *net,
 216                                       const struct nft_table *table,
 217                                       struct nft_chain *chain)
 218 {
 219         struct nft_base_chain *basechain;
 220         const struct nf_hook_ops *ops;
 221
 222         if (table->flags & NFT_TABLE_F_DORMANT ||
 223             !nft_is_base_chain(chain))
 224                 return;
 225         basechain = nft_base_chain(chain);
 226         ops = &basechain->ops;
 227
 228         if (basechain->type->ops_unregister)
 229                 return basechain->type->ops_unregister(net, ops);
 230
 231         if (table->family == NFPROTO_NETDEV)
 232                 nft_netdev_unregister_hooks(net, &basechain->hook_list);
 233         else
 234                 nf_unregister_net_hook(net, &basechain->ops);
 235 }
 236
 237 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 238 {
 239         struct nft_trans *trans;
 240
 241         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 242         if (trans == NULL)
 243                 return -ENOMEM;
 244
 245         if (msg_type == NFT_MSG_NEWTABLE)
 246                 nft_activate_next(ctx->net, ctx->table);
 247
 248         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 249         return 0;
 250 }
 251
 252 static int nft_deltable(struct nft_ctx *ctx)
 253 {
 254         int err;
 255
 256         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 257         if (err < 0)
 258                 return err;
 259
 260         nft_deactivate_next(ctx->net, ctx->table);
 261         return err;
 262 }
 263
 264 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 265 {
 266         struct nft_trans *trans;
 267
 268         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 269         if (trans == NULL)
 270                 return ERR_PTR(-ENOMEM);
 271
 272         if (msg_type == NFT_MSG_NEWCHAIN) {
 273                 nft_activate_next(ctx->net, ctx->chain);
 274
 275                 if (ctx->nla[NFTA_CHAIN_ID]) {
 276                         nft_trans_chain_id(trans) =
 277                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 278                 }
 279         }
 280
 281         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 282         return trans;
 283 }
 284
 285 static int nft_delchain(struct nft_ctx *ctx)
 286 {
 287         struct nft_trans *trans;
 288
 289         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 290         if (IS_ERR(trans))
 291                 return PTR_ERR(trans);
 292
 293         ctx->table->use--;
 294         nft_deactivate_next(ctx->net, ctx->chain);
 295
 296         return 0;
 297 }
 298
 299 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 300                                    struct nft_rule *rule)
 301 {
 302         struct nft_expr *expr;
 303
 304         expr = nft_expr_first(rule);
 305         while (expr != nft_expr_last(rule) && expr->ops) {
 306                 if (expr->ops->activate)
 307                         expr->ops->activate(ctx, expr);
 308
 309                 expr = nft_expr_next(expr);
 310         }
 311 }
 312
 313 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 314                                      struct nft_rule *rule,
 315                                      enum nft_trans_phase phase)
 316 {
 317         struct nft_expr *expr;
 318
 319         expr = nft_expr_first(rule);
 320         while (expr != nft_expr_last(rule) && expr->ops) {
 321                 if (expr->ops->deactivate)
 322                         expr->ops->deactivate(ctx, expr, phase);
 323
 324                 expr = nft_expr_next(expr);
 325         }
 326 }
 327
 328 static int
 329 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 330 {
 331         /* You cannot delete the same rule twice */
 332         if (nft_is_active_next(ctx->net, rule)) {
 333                 nft_deactivate_next(ctx->net, rule);
 334                 ctx->chain->use--;
 335                 return 0;
 336         }
 337         return -ENOENT;
 338 }
 339
 340 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 341                                             struct nft_rule *rule)
 342 {
 343         struct nft_trans *trans;
 344
 345         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 346         if (trans == NULL)
 347                 return NULL;
 348
 349         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 350                 nft_trans_rule_id(trans) =
 351                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 352         }
 353         nft_trans_rule(trans) = rule;
 354         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 355
 356         return trans;
 357 }
 358
 359 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 360 {
 361         struct nft_flow_rule *flow;
 362         struct nft_trans *trans;
 363         int err;
 364
 365         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 366         if (trans == NULL)
 367                 return -ENOMEM;
 368
 369         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 370                 flow = nft_flow_rule_create(ctx->net, rule);
 371                 if (IS_ERR(flow)) {
 372                         nft_trans_destroy(trans);
 373                         return PTR_ERR(flow);
 374                 }
 375
 376                 nft_trans_flow_rule(trans) = flow;
 377         }
 378
 379         err = nf_tables_delrule_deactivate(ctx, rule);
 380         if (err < 0) {
 381                 nft_trans_destroy(trans);
 382                 return err;
 383         }
 384         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 385
 386         return 0;
 387 }
 388
 389 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 390 {
 391         struct nft_rule *rule;
 392         int err;
 393
 394         list_for_each_entry(rule, &ctx->chain->rules, list) {
 395                 if (!nft_is_active_next(ctx->net, rule))
 396                         continue;
 397
 398                 err = nft_delrule(ctx, rule);
 399                 if (err < 0)
 400                         return err;
 401         }
 402         return 0;
 403 }
 404
 405 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 406                              struct nft_set *set)
 407 {
 408         struct nft_trans *trans;
 409
 410         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 411         if (trans == NULL)
 412                 return -ENOMEM;
 413
 414         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
 415                 nft_trans_set_id(trans) =
 416                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 417                 nft_activate_next(ctx->net, set);
 418         }
 419         nft_trans_set(trans) = set;
 420         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 421
 422         return 0;
 423 }
 424
 425 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 426 {
 427         int err;
 428
 429         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 430         if (err < 0)
 431                 return err;
 432
 433         nft_deactivate_next(ctx->net, set);
 434         ctx->table->use--;
 435
 436         return err;
 437 }
 438
 439 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 440                              struct nft_object *obj)
 441 {
 442         struct nft_trans *trans;
 443
 444         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 445         if (trans == NULL)
 446                 return -ENOMEM;
 447
 448         if (msg_type == NFT_MSG_NEWOBJ)
 449                 nft_activate_next(ctx->net, obj);
 450
 451         nft_trans_obj(trans) = obj;
 452         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 453
 454         return 0;
 455 }
 456
 457 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 458 {
 459         int err;
 460
 461         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 462         if (err < 0)
 463                 return err;
 464
 465         nft_deactivate_next(ctx->net, obj);
 466         ctx->table->use--;
 467
 468         return err;
 469 }
 470
 471 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 472                                    struct nft_flowtable *flowtable)
 473 {
 474         struct nft_trans *trans;
 475
 476         trans = nft_trans_alloc(ctx, msg_type,
 477                                 sizeof(struct nft_trans_flowtable));
 478         if (trans == NULL)
 479                 return -ENOMEM;
 480
 481         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 482                 nft_activate_next(ctx->net, flowtable);
 483
 484         nft_trans_flowtable(trans) = flowtable;
 485         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 486
 487         return 0;
 488 }
 489
 490 static int nft_delflowtable(struct nft_ctx *ctx,
 491                             struct nft_flowtable *flowtable)
 492 {
 493         int err;
 494
 495         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 496         if (err < 0)
 497                 return err;
 498
 499         nft_deactivate_next(ctx->net, flowtable);
 500         ctx->table->use--;
 501
 502         return err;
 503 }
 504
 505 /*
 506  * Tables
 507  */
 508
 509 static struct nft_table *nft_table_lookup(const struct net *net,
 510                                           const struct nlattr *nla,
 511                                           u8 family, u8 genmask)
 512 {
 513         struct nft_table *table;
 514
 515         if (nla == NULL)
 516                 return ERR_PTR(-EINVAL);
 517
 518         list_for_each_entry_rcu(table, &net->nft.tables, list,
 519                                 lockdep_is_held(&net->nft.commit_mutex)) {
 520                 if (!nla_strcmp(nla, table->name) &&
 521                     table->family == family &&
 522                     nft_active_genmask(table, genmask))
 523                         return table;
 524         }
 525
 526         return ERR_PTR(-ENOENT);
 527 }
 528
 529 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 530                                                    const struct nlattr *nla,
 531                                                    u8 genmask)
 532 {
 533         struct nft_table *table;
 534
 535         list_for_each_entry(table, &net->nft.tables, list) {
 536                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 537                     nft_active_genmask(table, genmask))
 538                         return table;
 539         }
 540
 541         return ERR_PTR(-ENOENT);
 542 }
 543
 544 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 545 {
 546         return ++table->hgenerator;
 547 }
 548
 549 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 550
 551 static const struct nft_chain_type *
 552 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 553 {
 554         if (family >= NFPROTO_NUMPROTO ||
 555             type >= NFT_CHAIN_T_MAX)
 556                 return NULL;
 557
 558         return chain_type[family][type];
 559 }
 560
 561 static const struct nft_chain_type *
 562 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 563 {
 564         const struct nft_chain_type *type;
 565         int i;
 566
 567         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 568                 type = __nft_chain_type_get(family, i);
 569                 if (!type)
 570                         continue;
 571                 if (!nla_strcmp(nla, type->name))
 572                         return type;
 573         }
 574         return NULL;
 575 }
 576
 577 struct nft_module_request {
 578         struct list_head        list;
 579         char                    module[MODULE_NAME_LEN];
 580         bool                    done;
 581 };
 582
 583 #ifdef CONFIG_MODULES
 584 static int nft_request_module(struct net *net, const char *fmt, ...)
 585 {
 586         char module_name[MODULE_NAME_LEN];
 587         struct nft_module_request *req;
 588         va_list args;
 589         int ret;
 590
 591         va_start(args, fmt);
 592         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 593         va_end(args);
 594         if (ret >= MODULE_NAME_LEN)
 595                 return 0;
 596
 597         list_for_each_entry(req, &net->nft.module_list, list) {
 598                 if (!strcmp(req->module, module_name)) {
 599                         if (req->done)
 600                                 return 0;
 601
 602                         /* A request to load this module already exists. */
 603                         return -EAGAIN;
 604                 }
 605         }
 606
 607         req = kmalloc(sizeof(*req), GFP_KERNEL);
 608         if (!req)
 609                 return -ENOMEM;
 610
 611         req->done = false;
 612         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 613         list_add_tail(&req->list, &net->nft.module_list);
 614
 615         return -EAGAIN;
 616 }
 617 #endif
 618
 619 static void lockdep_nfnl_nft_mutex_not_held(void)
 620 {
 621 #ifdef CONFIG_PROVE_LOCKING
 622         WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 623 #endif
 624 }
 625
 626 static const struct nft_chain_type *
 627 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 628                             u8 family, bool autoload)
 629 {
 630         const struct nft_chain_type *type;
 631
 632         type = __nf_tables_chain_type_lookup(nla, family);
 633         if (type != NULL)
 634                 return type;
 635
 636         lockdep_nfnl_nft_mutex_not_held();
 637 #ifdef CONFIG_MODULES
 638         if (autoload) {
 639                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 640                                        nla_len(nla),
 641                                        (const char *)nla_data(nla)) == -EAGAIN)
 642                         return ERR_PTR(-EAGAIN);
 643         }
 644 #endif
 645         return ERR_PTR(-ENOENT);
 646 }
 647
 648 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 649         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 650                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 651         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 652         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 653 };
 654
 655 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 656                                      u32 portid, u32 seq, int event, u32 flags,
 657                                      int family, const struct nft_table *table)
 658 {
 659         struct nlmsghdr *nlh;
 660         struct nfgenmsg *nfmsg;
 661
 662         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 663         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
 664         if (nlh == NULL)
 665                 goto nla_put_failure;
 666
 667         nfmsg = nlmsg_data(nlh);
 668         nfmsg->nfgen_family     = family;
 669         nfmsg->version          = NFNETLINK_V0;
 670         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
 671
 672         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 673             nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
 674             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 675             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 676                          NFTA_TABLE_PAD))
 677                 goto nla_put_failure;
 678
 679         nlmsg_end(skb, nlh);
 680         return 0;
 681
 682 nla_put_failure:
 683         nlmsg_trim(skb, nlh);
 684         return -1;
 685 }
 686
 687 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 688 {
 689         struct sk_buff *skb;
 690         int err;
 691         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
 692                               ctx->table->name, ctx->table->handle);
 693
 694         audit_log_nfcfg(buf,
 695                         ctx->family,
 696                         ctx->table->use,
 697                         event == NFT_MSG_NEWTABLE ?
 698                                 AUDIT_NFT_OP_TABLE_REGISTER :
 699                                 AUDIT_NFT_OP_TABLE_UNREGISTER,
 700                         GFP_KERNEL);
 701         kfree(buf);
 702
 703         if (!ctx->report &&
 704             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 705                 return;
 706
 707         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 708         if (skb == NULL)
 709                 goto err;
 710
 711         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 712                                         event, 0, ctx->family, ctx->table);
 713         if (err < 0) {
 714                 kfree_skb(skb);
 715                 goto err;
 716         }
 717
 718         nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
 719                        ctx->report, GFP_KERNEL);
 720         return;
 721 err:
 722         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 723 }
 724
 725 static int nf_tables_dump_tables(struct sk_buff *skb,
 726                                  struct netlink_callback *cb)
 727 {
 728         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 729         const struct nft_table *table;
 730         unsigned int idx = 0, s_idx = cb->args[0];
 731         struct net *net = sock_net(skb->sk);
 732         int family = nfmsg->nfgen_family;
 733
 734         rcu_read_lock();
 735         cb->seq = net->nft.base_seq;
 736
 737         list_for_each_entry_rcu(table, &net->nft.tables, list) {
 738                 if (family != NFPROTO_UNSPEC && family != table->family)
 739                         continue;
 740
 741                 if (idx < s_idx)
 742                         goto cont;
 743                 if (idx > s_idx)
 744                         memset(&cb->args[1], 0,
 745                                sizeof(cb->args) - sizeof(cb->args[0]));
 746                 if (!nft_is_active(net, table))
 747                         continue;
 748                 if (nf_tables_fill_table_info(skb, net,
 749                                               NETLINK_CB(cb->skb).portid,
 750                                               cb->nlh->nlmsg_seq,
 751                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 752                                               table->family, table) < 0)
 753                         goto done;
 754
 755                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 756 cont:
 757                 idx++;
 758         }
 759 done:
 760         rcu_read_unlock();
 761         cb->args[0] = idx;
 762         return skb->len;
 763 }
 764
 765 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 766                                       const struct nlmsghdr *nlh,
 767                                       struct netlink_dump_control *c)
 768 {
 769         int err;
 770
 771         if (!try_module_get(THIS_MODULE))
 772                 return -EINVAL;
 773
 774         rcu_read_unlock();
 775         err = netlink_dump_start(nlsk, skb, nlh, c);
 776         rcu_read_lock();
 777         module_put(THIS_MODULE);
 778
 779         return err;
 780 }
 781
 782 /* called with rcu_read_lock held */
 783 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
 784                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 785                               const struct nlattr * const nla[],
 786                               struct netlink_ext_ack *extack)
 787 {
 788         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 789         u8 genmask = nft_genmask_cur(net);
 790         const struct nft_table *table;
 791         struct sk_buff *skb2;
 792         int family = nfmsg->nfgen_family;
 793         int err;
 794
 795         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 796                 struct netlink_dump_control c = {
 797                         .dump = nf_tables_dump_tables,
 798                         .module = THIS_MODULE,
 799                 };
 800
 801                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
 802         }
 803
 804         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
 805         if (IS_ERR(table)) {
 806                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 807                 return PTR_ERR(table);
 808         }
 809
 810         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 811         if (!skb2)
 812                 return -ENOMEM;
 813
 814         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 815                                         nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
 816                                         family, table);
 817         if (err < 0)
 818                 goto err;
 819
 820         return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
 821
 822 err:
 823         kfree_skb(skb2);
 824         return err;
 825 }
 826
 827 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 828 {
 829         struct nft_chain *chain;
 830         u32 i = 0;
 831
 832         list_for_each_entry(chain, &table->chains, list) {
 833                 if (!nft_is_active_next(net, chain))
 834                         continue;
 835                 if (!nft_is_base_chain(chain))
 836                         continue;
 837
 838                 if (cnt && i++ == cnt)
 839                         break;
 840
 841                 nf_tables_unregister_hook(net, table, chain);
 842         }
 843 }
 844
 845 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 846 {
 847         struct nft_chain *chain;
 848         int err, i = 0;
 849
 850         list_for_each_entry(chain, &table->chains, list) {
 851                 if (!nft_is_active_next(net, chain))
 852                         continue;
 853                 if (!nft_is_base_chain(chain))
 854                         continue;
 855
 856                 err = nf_tables_register_hook(net, table, chain);
 857                 if (err < 0)
 858                         goto err_register_hooks;
 859
 860                 i++;
 861         }
 862         return 0;
 863
 864 err_register_hooks:
 865         if (i)
 866                 nft_table_disable(net, table, i);
 867         return err;
 868 }
 869
 870 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 871 {
 872         nft_table_disable(net, table, 0);
 873 }
 874
 875 static int nf_tables_updtable(struct nft_ctx *ctx)
 876 {
 877         struct nft_trans *trans;
 878         u32 flags;
 879         int ret = 0;
 880
 881         if (!ctx->nla[NFTA_TABLE_FLAGS])
 882                 return 0;
 883
 884         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
 885         if (flags & ~NFT_TABLE_F_DORMANT)
 886                 return -EINVAL;
 887
 888         if (flags == ctx->table->flags)
 889                 return 0;
 890
 891         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
 892                                 sizeof(struct nft_trans_table));
 893         if (trans == NULL)
 894                 return -ENOMEM;
 895
 896         if ((flags & NFT_TABLE_F_DORMANT) &&
 897             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
 898                 nft_trans_table_enable(trans) = false;
 899         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
 900                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
 901                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
 902                 ret = nf_tables_table_enable(ctx->net, ctx->table);
 903                 if (ret >= 0)
 904                         nft_trans_table_enable(trans) = true;
 905                 else
 906                         ctx->table->flags |= NFT_TABLE_F_DORMANT;
 907         }
 908         if (ret < 0)
 909                 goto err;
 910
 911         nft_trans_table_update(trans) = true;
 912         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 913         return 0;
 914 err:
 915         nft_trans_destroy(trans);
 916         return ret;
 917 }
 918
 919 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
 920 {
 921         const char *name = data;
 922
 923         return jhash(name, strlen(name), seed);
 924 }
 925
 926 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
 927 {
 928         const struct nft_chain *chain = data;
 929
 930         return nft_chain_hash(chain->name, 0, seed);
 931 }
 932
 933 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
 934                               const void *ptr)
 935 {
 936         const struct nft_chain *chain = ptr;
 937         const char *name = arg->key;
 938
 939         return strcmp(chain->name, name);
 940 }
 941
 942 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
 943 {
 944         const struct nft_object_hash_key *k = data;
 945
 946         seed ^= hash_ptr(k->table, 32);
 947
 948         return jhash(k->name, strlen(k->name), seed);
 949 }
 950
 951 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
 952 {
 953         const struct nft_object *obj = data;
 954
 955         return nft_objname_hash(&obj->key, 0, seed);
 956 }
 957
 958 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
 959                                 const void *ptr)
 960 {
 961         const struct nft_object_hash_key *k = arg->key;
 962         const struct nft_object *obj = ptr;
 963
 964         if (obj->key.table != k->table)
 965                 return -1;
 966
 967         return strcmp(obj->key.name, k->name);
 968 }
 969
 970 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
 971                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 972                               const struct nlattr * const nla[],
 973                               struct netlink_ext_ack *extack)
 974 {
 975         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 976         u8 genmask = nft_genmask_next(net);
 977         int family = nfmsg->nfgen_family;
 978         const struct nlattr *attr;
 979         struct nft_table *table;
 980         u32 flags = 0;
 981         struct nft_ctx ctx;
 982         int err;
 983
 984         lockdep_assert_held(&net->nft.commit_mutex);
 985         attr = nla[NFTA_TABLE_NAME];
 986         table = nft_table_lookup(net, attr, family, genmask);
 987         if (IS_ERR(table)) {
 988                 if (PTR_ERR(table) != -ENOENT)
 989                         return PTR_ERR(table);
 990         } else {
 991                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
 992                         NL_SET_BAD_ATTR(extack, attr);
 993                         return -EEXIST;
 994                 }
 995                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
 996                         return -EOPNOTSUPP;
 997
 998                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
 999                 return nf_tables_updtable(&ctx);
1000         }
1001
1002         if (nla[NFTA_TABLE_FLAGS]) {
1003                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1004                 if (flags & ~NFT_TABLE_F_DORMANT)
1005                         return -EINVAL;
1006         }
1007
1008         err = -ENOMEM;
1009         table = kzalloc(sizeof(*table), GFP_KERNEL);
1010         if (table == NULL)
1011                 goto err_kzalloc;
1012
1013         table->name = nla_strdup(attr, GFP_KERNEL);
1014         if (table->name == NULL)
1015                 goto err_strdup;
1016
1017         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1018         if (err)
1019                 goto err_chain_ht;
1020
1021         INIT_LIST_HEAD(&table->chains);
1022         INIT_LIST_HEAD(&table->sets);
1023         INIT_LIST_HEAD(&table->objects);
1024         INIT_LIST_HEAD(&table->flowtables);
1025         table->family = family;
1026         table->flags = flags;
1027         table->handle = ++table_handle;
1028
1029         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1030         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1031         if (err < 0)
1032                 goto err_trans;
1033
1034         list_add_tail_rcu(&table->list, &net->nft.tables);
1035         return 0;
1036 err_trans:
1037         rhltable_destroy(&table->chains_ht);
1038 err_chain_ht:
1039         kfree(table->name);
1040 err_strdup:
1041         kfree(table);
1042 err_kzalloc:
1043         return err;
1044 }
1045
1046 static int nft_flush_table(struct nft_ctx *ctx)
1047 {
1048         struct nft_flowtable *flowtable, *nft;
1049         struct nft_chain *chain, *nc;
1050         struct nft_object *obj, *ne;
1051         struct nft_set *set, *ns;
1052         int err;
1053
1054         list_for_each_entry(chain, &ctx->table->chains, list) {
1055                 if (!nft_is_active_next(ctx->net, chain))
1056                         continue;
1057
1058                 if (nft_chain_is_bound(chain))
1059                         continue;
1060
1061                 ctx->chain = chain;
1062
1063                 err = nft_delrule_by_chain(ctx);
1064                 if (err < 0)
1065                         goto out;
1066         }
1067
1068         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1069                 if (!nft_is_active_next(ctx->net, set))
1070                         continue;
1071
1072                 if (nft_set_is_anonymous(set) &&
1073                     !list_empty(&set->bindings))
1074                         continue;
1075
1076                 err = nft_delset(ctx, set);
1077                 if (err < 0)
1078                         goto out;
1079         }
1080
1081         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1082                 if (!nft_is_active_next(ctx->net, flowtable))
1083                         continue;
1084
1085                 err = nft_delflowtable(ctx, flowtable);
1086                 if (err < 0)
1087                         goto out;
1088         }
1089
1090         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1091                 if (!nft_is_active_next(ctx->net, obj))
1092                         continue;
1093
1094                 err = nft_delobj(ctx, obj);
1095                 if (err < 0)
1096                         goto out;
1097         }
1098
1099         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1100                 if (!nft_is_active_next(ctx->net, chain))
1101                         continue;
1102
1103                 if (nft_chain_is_bound(chain))
1104                         continue;
1105
1106                 ctx->chain = chain;
1107
1108                 err = nft_delchain(ctx);
1109                 if (err < 0)
1110                         goto out;
1111         }
1112
1113         err = nft_deltable(ctx);
1114 out:
1115         return err;
1116 }
1117
1118 static int nft_flush(struct nft_ctx *ctx, int family)
1119 {
1120         struct nft_table *table, *nt;
1121         const struct nlattr * const *nla = ctx->nla;
1122         int err = 0;
1123
1124         list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1125                 if (family != AF_UNSPEC && table->family != family)
1126                         continue;
1127
1128                 ctx->family = table->family;
1129
1130                 if (!nft_is_active_next(ctx->net, table))
1131                         continue;
1132
1133                 if (nla[NFTA_TABLE_NAME] &&
1134                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1135                         continue;
1136
1137                 ctx->table = table;
1138
1139                 err = nft_flush_table(ctx);
1140                 if (err < 0)
1141                         goto out;
1142         }
1143 out:
1144         return err;
1145 }
1146
1147 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1148                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1149                               const struct nlattr * const nla[],
1150                               struct netlink_ext_ack *extack)
1151 {
1152         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1153         u8 genmask = nft_genmask_next(net);
1154         int family = nfmsg->nfgen_family;
1155         const struct nlattr *attr;
1156         struct nft_table *table;
1157         struct nft_ctx ctx;
1158
1159         nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1160         if (family == AF_UNSPEC ||
1161             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1162                 return nft_flush(&ctx, family);
1163
1164         if (nla[NFTA_TABLE_HANDLE]) {
1165                 attr = nla[NFTA_TABLE_HANDLE];
1166                 table = nft_table_lookup_byhandle(net, attr, genmask);
1167         } else {
1168                 attr = nla[NFTA_TABLE_NAME];
1169                 table = nft_table_lookup(net, attr, family, genmask);
1170         }
1171
1172         if (IS_ERR(table)) {
1173                 NL_SET_BAD_ATTR(extack, attr);
1174                 return PTR_ERR(table);
1175         }
1176
1177         if (nlh->nlmsg_flags & NLM_F_NONREC &&
1178             table->use > 0)
1179                 return -EBUSY;
1180
1181         ctx.family = family;
1182         ctx.table = table;
1183
1184         return nft_flush_table(&ctx);
1185 }
1186
1187 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1188 {
1189         if (WARN_ON(ctx->table->use > 0))
1190                 return;
1191
1192         rhltable_destroy(&ctx->table->chains_ht);
1193         kfree(ctx->table->name);
1194         kfree(ctx->table);
1195 }
1196
1197 void nft_register_chain_type(const struct nft_chain_type *ctype)
1198 {
1199         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1200         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1201                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1202                 return;
1203         }
1204         chain_type[ctype->family][ctype->type] = ctype;
1205         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1206 }
1207 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1208
1209 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1210 {
1211         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1212         chain_type[ctype->family][ctype->type] = NULL;
1213         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1214 }
1215 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1216
1217 /*
1218  * Chains
1219  */
1220
1221 static struct nft_chain *
1222 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1223 {
1224         struct nft_chain *chain;
1225
1226         list_for_each_entry(chain, &table->chains, list) {
1227                 if (chain->handle == handle &&
1228                     nft_active_genmask(chain, genmask))
1229                         return chain;
1230         }
1231
1232         return ERR_PTR(-ENOENT);
1233 }
1234
1235 static bool lockdep_commit_lock_is_held(const struct net *net)
1236 {
1237 #ifdef CONFIG_PROVE_LOCKING
1238         return lockdep_is_held(&net->nft.commit_mutex);
1239 #else
1240         return true;
1241 #endif
1242 }
1243
1244 static struct nft_chain *nft_chain_lookup(struct net *net,
1245                                           struct nft_table *table,
1246                                           const struct nlattr *nla, u8 genmask)
1247 {
1248         char search[NFT_CHAIN_MAXNAMELEN + 1];
1249         struct rhlist_head *tmp, *list;
1250         struct nft_chain *chain;
1251
1252         if (nla == NULL)
1253                 return ERR_PTR(-EINVAL);
1254
1255         nla_strlcpy(search, nla, sizeof(search));
1256
1257         WARN_ON(!rcu_read_lock_held() &&
1258                 !lockdep_commit_lock_is_held(net));
1259
1260         chain = ERR_PTR(-ENOENT);
1261         rcu_read_lock();
1262         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1263         if (!list)
1264                 goto out_unlock;
1265
1266         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1267                 if (nft_active_genmask(chain, genmask))
1268                         goto out_unlock;
1269         }
1270         chain = ERR_PTR(-ENOENT);
1271 out_unlock:
1272         rcu_read_unlock();
1273         return chain;
1274 }
1275
1276 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1277         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1278                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1279         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1280         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1281                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1282         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1283         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1284         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1285                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1286         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1287         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1288         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1289 };
1290
1291 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1292         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1293         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1294         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1295                                     .len = IFNAMSIZ - 1 },
1296 };
1297
1298 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1299 {
1300         struct nft_stats *cpu_stats, total;
1301         struct nlattr *nest;
1302         unsigned int seq;
1303         u64 pkts, bytes;
1304         int cpu;
1305
1306         if (!stats)
1307                 return 0;
1308
1309         memset(&total, 0, sizeof(total));
1310         for_each_possible_cpu(cpu) {
1311                 cpu_stats = per_cpu_ptr(stats, cpu);
1312                 do {
1313                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1314                         pkts = cpu_stats->pkts;
1315                         bytes = cpu_stats->bytes;
1316                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1317                 total.pkts += pkts;
1318                 total.bytes += bytes;
1319         }
1320         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1321         if (nest == NULL)
1322                 goto nla_put_failure;
1323
1324         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1325                          NFTA_COUNTER_PAD) ||
1326             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1327                          NFTA_COUNTER_PAD))
1328                 goto nla_put_failure;
1329
1330         nla_nest_end(skb, nest);
1331         return 0;
1332
1333 nla_put_failure:
1334         return -ENOSPC;
1335 }
1336
1337 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1338                                    const struct nft_base_chain *basechain)
1339 {
1340         const struct nf_hook_ops *ops = &basechain->ops;
1341         struct nft_hook *hook, *first = NULL;
1342         struct nlattr *nest, *nest_devs;
1343         int n = 0;
1344
1345         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1346         if (nest == NULL)
1347                 goto nla_put_failure;
1348         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1349                 goto nla_put_failure;
1350         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1351                 goto nla_put_failure;
1352
1353         if (family == NFPROTO_NETDEV) {
1354                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1355                 list_for_each_entry(hook, &basechain->hook_list, list) {
1356                         if (!first)
1357                                 first = hook;
1358
1359                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1360                                            hook->ops.dev->name))
1361                                 goto nla_put_failure;
1362                         n++;
1363                 }
1364                 nla_nest_end(skb, nest_devs);
1365
1366                 if (n == 1 &&
1367                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1368                         goto nla_put_failure;
1369         }
1370         nla_nest_end(skb, nest);
1371
1372         return 0;
1373 nla_put_failure:
1374         return -1;
1375 }
1376
1377 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1378                                      u32 portid, u32 seq, int event, u32 flags,
1379                                      int family, const struct nft_table *table,
1380                                      const struct nft_chain *chain)
1381 {
1382         struct nlmsghdr *nlh;
1383         struct nfgenmsg *nfmsg;
1384
1385         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1386         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1387         if (nlh == NULL)
1388                 goto nla_put_failure;
1389
1390         nfmsg = nlmsg_data(nlh);
1391         nfmsg->nfgen_family     = family;
1392         nfmsg->version          = NFNETLINK_V0;
1393         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
1394
1395         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1396                 goto nla_put_failure;
1397         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1398                          NFTA_CHAIN_PAD))
1399                 goto nla_put_failure;
1400         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1401                 goto nla_put_failure;
1402
1403         if (nft_is_base_chain(chain)) {
1404                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1405                 struct nft_stats __percpu *stats;
1406
1407                 if (nft_dump_basechain_hook(skb, family, basechain))
1408                         goto nla_put_failure;
1409
1410                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1411                                  htonl(basechain->policy)))
1412                         goto nla_put_failure;
1413
1414                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1415                         goto nla_put_failure;
1416
1417                 stats = rcu_dereference_check(basechain->stats,
1418                                               lockdep_commit_lock_is_held(net));
1419                 if (nft_dump_stats(skb, stats))
1420                         goto nla_put_failure;
1421         }
1422
1423         if (chain->flags &&
1424             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1425                 goto nla_put_failure;
1426
1427         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1428                 goto nla_put_failure;
1429
1430         nlmsg_end(skb, nlh);
1431         return 0;
1432
1433 nla_put_failure:
1434         nlmsg_trim(skb, nlh);
1435         return -1;
1436 }
1437
1438 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1439 {
1440         struct sk_buff *skb;
1441         int err;
1442         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
1443                               ctx->table->name, ctx->table->handle,
1444                               ctx->chain->name, ctx->chain->handle);
1445
1446         audit_log_nfcfg(buf,
1447                         ctx->family,
1448                         ctx->chain->use,
1449                         event == NFT_MSG_NEWCHAIN ?
1450                                 AUDIT_NFT_OP_CHAIN_REGISTER :
1451                                 AUDIT_NFT_OP_CHAIN_UNREGISTER,
1452                         GFP_KERNEL);
1453         kfree(buf);
1454
1455         if (!ctx->report &&
1456             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1457                 return;
1458
1459         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1460         if (skb == NULL)
1461                 goto err;
1462
1463         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1464                                         event, 0, ctx->family, ctx->table,
1465                                         ctx->chain);
1466         if (err < 0) {
1467                 kfree_skb(skb);
1468                 goto err;
1469         }
1470
1471         nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1472                        ctx->report, GFP_KERNEL);
1473         return;
1474 err:
1475         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1476 }
1477
1478 static int nf_tables_dump_chains(struct sk_buff *skb,
1479                                  struct netlink_callback *cb)
1480 {
1481         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1482         const struct nft_table *table;
1483         const struct nft_chain *chain;
1484         unsigned int idx = 0, s_idx = cb->args[0];
1485         struct net *net = sock_net(skb->sk);
1486         int family = nfmsg->nfgen_family;
1487
1488         rcu_read_lock();
1489         cb->seq = net->nft.base_seq;
1490
1491         list_for_each_entry_rcu(table, &net->nft.tables, list) {
1492                 if (family != NFPROTO_UNSPEC && family != table->family)
1493                         continue;
1494
1495                 list_for_each_entry_rcu(chain, &table->chains, list) {
1496                         if (idx < s_idx)
1497                                 goto cont;
1498                         if (idx > s_idx)
1499                                 memset(&cb->args[1], 0,
1500                                        sizeof(cb->args) - sizeof(cb->args[0]));
1501                         if (!nft_is_active(net, chain))
1502                                 continue;
1503                         if (nf_tables_fill_chain_info(skb, net,
1504                                                       NETLINK_CB(cb->skb).portid,
1505                                                       cb->nlh->nlmsg_seq,
1506                                                       NFT_MSG_NEWCHAIN,
1507                                                       NLM_F_MULTI,
1508                                                       table->family, table,
1509                                                       chain) < 0)
1510                                 goto done;
1511
1512                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1513 cont:
1514                         idx++;
1515                 }
1516         }
1517 done:
1518         rcu_read_unlock();
1519         cb->args[0] = idx;
1520         return skb->len;
1521 }
1522
1523 /* called with rcu_read_lock held */
1524 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1525                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1526                               const struct nlattr * const nla[],
1527                               struct netlink_ext_ack *extack)
1528 {
1529         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1530         u8 genmask = nft_genmask_cur(net);
1531         const struct nft_chain *chain;
1532         struct nft_table *table;
1533         struct sk_buff *skb2;
1534         int family = nfmsg->nfgen_family;
1535         int err;
1536
1537         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1538                 struct netlink_dump_control c = {
1539                         .dump = nf_tables_dump_chains,
1540                         .module = THIS_MODULE,
1541                 };
1542
1543                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1544         }
1545
1546         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1547         if (IS_ERR(table)) {
1548                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1549                 return PTR_ERR(table);
1550         }
1551
1552         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1553         if (IS_ERR(chain)) {
1554                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1555                 return PTR_ERR(chain);
1556         }
1557
1558         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1559         if (!skb2)
1560                 return -ENOMEM;
1561
1562         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1563                                         nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1564                                         family, table, chain);
1565         if (err < 0)
1566                 goto err;
1567
1568         return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1569
1570 err:
1571         kfree_skb(skb2);
1572         return err;
1573 }
1574
1575 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1576         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1577         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1578 };
1579
1580 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1581 {
1582         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1583         struct nft_stats __percpu *newstats;
1584         struct nft_stats *stats;
1585         int err;
1586
1587         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1588                                           nft_counter_policy, NULL);
1589         if (err < 0)
1590                 return ERR_PTR(err);
1591
1592         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1593                 return ERR_PTR(-EINVAL);
1594
1595         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1596         if (newstats == NULL)
1597                 return ERR_PTR(-ENOMEM);
1598
1599         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1600          * are not exposed to userspace.
1601          */
1602         preempt_disable();
1603         stats = this_cpu_ptr(newstats);
1604         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1605         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1606         preempt_enable();
1607
1608         return newstats;
1609 }
1610
1611 static void nft_chain_stats_replace(struct nft_trans *trans)
1612 {
1613         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1614
1615         if (!nft_trans_chain_stats(trans))
1616                 return;
1617
1618         nft_trans_chain_stats(trans) =
1619                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1620                                     lockdep_commit_lock_is_held(trans->ctx.net));
1621
1622         if (!nft_trans_chain_stats(trans))
1623                 static_branch_inc(&nft_counters_enabled);
1624 }
1625
1626 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1627 {
1628         struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1629         struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1630
1631         if (g0 != g1)
1632                 kvfree(g1);
1633         kvfree(g0);
1634
1635         /* should be NULL either via abort or via successful commit */
1636         WARN_ON_ONCE(chain->rules_next);
1637         kvfree(chain->rules_next);
1638 }
1639
1640 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1641 {
1642         struct nft_chain *chain = ctx->chain;
1643         struct nft_hook *hook, *next;
1644
1645         if (WARN_ON(chain->use > 0))
1646                 return;
1647
1648         /* no concurrent access possible anymore */
1649         nf_tables_chain_free_chain_rules(chain);
1650
1651         if (nft_is_base_chain(chain)) {
1652                 struct nft_base_chain *basechain = nft_base_chain(chain);
1653
1654                 if (ctx->family == NFPROTO_NETDEV) {
1655                         list_for_each_entry_safe(hook, next,
1656                                                  &basechain->hook_list, list) {
1657                                 list_del_rcu(&hook->list);
1658                                 kfree_rcu(hook, rcu);
1659                         }
1660                 }
1661                 module_put(basechain->type->owner);
1662                 if (rcu_access_pointer(basechain->stats)) {
1663                         static_branch_dec(&nft_counters_enabled);
1664                         free_percpu(rcu_dereference_raw(basechain->stats));
1665                 }
1666                 kfree(chain->name);
1667                 kfree(basechain);
1668         } else {
1669                 kfree(chain->name);
1670                 kfree(chain);
1671         }
1672 }
1673
1674 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1675                                               const struct nlattr *attr)
1676 {
1677         struct net_device *dev;
1678         char ifname[IFNAMSIZ];
1679         struct nft_hook *hook;
1680         int err;
1681
1682         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1683         if (!hook) {
1684                 err = -ENOMEM;
1685                 goto err_hook_alloc;
1686         }
1687
1688         nla_strlcpy(ifname, attr, IFNAMSIZ);
1689         dev = __dev_get_by_name(net, ifname);
1690         if (!dev) {
1691                 err = -ENOENT;
1692                 goto err_hook_dev;
1693         }
1694         hook->ops.dev = dev;
1695         hook->inactive = false;
1696
1697         return hook;
1698
1699 err_hook_dev:
1700         kfree(hook);
1701 err_hook_alloc:
1702         return ERR_PTR(err);
1703 }
1704
1705 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1706                                            const struct nft_hook *this)
1707 {
1708         struct nft_hook *hook;
1709
1710         list_for_each_entry(hook, hook_list, list) {
1711                 if (this->ops.dev == hook->ops.dev)
1712                         return hook;
1713         }
1714
1715         return NULL;
1716 }
1717
1718 static int nf_tables_parse_netdev_hooks(struct net *net,
1719                                         const struct nlattr *attr,
1720                                         struct list_head *hook_list)
1721 {
1722         struct nft_hook *hook, *next;
1723         const struct nlattr *tmp;
1724         int rem, n = 0, err;
1725
1726         nla_for_each_nested(tmp, attr, rem) {
1727                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1728                         err = -EINVAL;
1729                         goto err_hook;
1730                 }
1731
1732                 hook = nft_netdev_hook_alloc(net, tmp);
1733                 if (IS_ERR(hook)) {
1734                         err = PTR_ERR(hook);
1735                         goto err_hook;
1736                 }
1737                 if (nft_hook_list_find(hook_list, hook)) {
1738                         kfree(hook);
1739                         err = -EEXIST;
1740                         goto err_hook;
1741                 }
1742                 list_add_tail(&hook->list, hook_list);
1743                 n++;
1744
1745                 if (n == NFT_NETDEVICE_MAX) {
1746                         err = -EFBIG;
1747                         goto err_hook;
1748                 }
1749         }
1750
1751         return 0;
1752
1753 err_hook:
1754         list_for_each_entry_safe(hook, next, hook_list, list) {
1755                 list_del(&hook->list);
1756                 kfree(hook);
1757         }
1758         return err;
1759 }
1760
1761 struct nft_chain_hook {
1762         u32                             num;
1763         s32                             priority;
1764         const struct nft_chain_type     *type;
1765         struct list_head                list;
1766 };
1767
1768 static int nft_chain_parse_netdev(struct net *net,
1769                                   struct nlattr *tb[],
1770                                   struct list_head *hook_list)
1771 {
1772         struct nft_hook *hook;
1773         int err;
1774
1775         if (tb[NFTA_HOOK_DEV]) {
1776                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1777                 if (IS_ERR(hook))
1778                         return PTR_ERR(hook);
1779
1780                 list_add_tail(&hook->list, hook_list);
1781         } else if (tb[NFTA_HOOK_DEVS]) {
1782                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1783                                                    hook_list);
1784                 if (err < 0)
1785                         return err;
1786
1787                 if (list_empty(hook_list))
1788                         return -EINVAL;
1789         } else {
1790                 return -EINVAL;
1791         }
1792
1793         return 0;
1794 }
1795
1796 static int nft_chain_parse_hook(struct net *net,
1797                                 const struct nlattr * const nla[],
1798                                 struct nft_chain_hook *hook, u8 family,
1799                                 bool autoload)
1800 {
1801         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1802         const struct nft_chain_type *type;
1803         int err;
1804
1805         lockdep_assert_held(&net->nft.commit_mutex);
1806         lockdep_nfnl_nft_mutex_not_held();
1807
1808         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1809                                           nla[NFTA_CHAIN_HOOK],
1810                                           nft_hook_policy, NULL);
1811         if (err < 0)
1812                 return err;
1813
1814         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1815             ha[NFTA_HOOK_PRIORITY] == NULL)
1816                 return -EINVAL;
1817
1818         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1819         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1820
1821         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1822         if (!type)
1823                 return -EOPNOTSUPP;
1824
1825         if (nla[NFTA_CHAIN_TYPE]) {
1826                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1827                                                    family, autoload);
1828                 if (IS_ERR(type))
1829                         return PTR_ERR(type);
1830         }
1831         if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1832                 return -EOPNOTSUPP;
1833
1834         if (type->type == NFT_CHAIN_T_NAT &&
1835             hook->priority <= NF_IP_PRI_CONNTRACK)
1836                 return -EOPNOTSUPP;
1837
1838         if (!try_module_get(type->owner))
1839                 return -ENOENT;
1840
1841         hook->type = type;
1842
1843         INIT_LIST_HEAD(&hook->list);
1844         if (family == NFPROTO_NETDEV) {
1845                 err = nft_chain_parse_netdev(net, ha, &hook->list);
1846                 if (err < 0) {
1847                         module_put(type->owner);
1848                         return err;
1849                 }
1850         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1851                 module_put(type->owner);
1852                 return -EOPNOTSUPP;
1853         }
1854
1855         return 0;
1856 }
1857
1858 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1859 {
1860         struct nft_hook *h, *next;
1861
1862         list_for_each_entry_safe(h, next, &hook->list, list) {
1863                 list_del(&h->list);
1864                 kfree(h);
1865         }
1866         module_put(hook->type->owner);
1867 }
1868
1869 struct nft_rules_old {
1870         struct rcu_head h;
1871         struct nft_rule **start;
1872 };
1873
1874 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1875                                                      unsigned int alloc)
1876 {
1877         if (alloc > INT_MAX)
1878                 return NULL;
1879
1880         alloc += 1;     /* NULL, ends rules */
1881         if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1882                 return NULL;
1883
1884         alloc *= sizeof(struct nft_rule *);
1885         alloc += sizeof(struct nft_rules_old);
1886
1887         return kvmalloc(alloc, GFP_KERNEL);
1888 }
1889
1890 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1891                                     const struct nft_chain_hook *hook,
1892                                     struct nft_chain *chain)
1893 {
1894         ops->pf         = family;
1895         ops->hooknum    = hook->num;
1896         ops->priority   = hook->priority;
1897         ops->priv       = chain;
1898         ops->hook       = hook->type->hooks[ops->hooknum];
1899 }
1900
1901 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1902                               struct nft_chain_hook *hook, u32 flags)
1903 {
1904         struct nft_chain *chain;
1905         struct nft_hook *h;
1906
1907         basechain->type = hook->type;
1908         INIT_LIST_HEAD(&basechain->hook_list);
1909         chain = &basechain->chain;
1910
1911         if (family == NFPROTO_NETDEV) {
1912                 list_splice_init(&hook->list, &basechain->hook_list);
1913                 list_for_each_entry(h, &basechain->hook_list, list)
1914                         nft_basechain_hook_init(&h->ops, family, hook, chain);
1915
1916                 basechain->ops.hooknum  = hook->num;
1917                 basechain->ops.priority = hook->priority;
1918         } else {
1919                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1920         }
1921
1922         chain->flags |= NFT_CHAIN_BASE | flags;
1923         basechain->policy = NF_ACCEPT;
1924         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1925             nft_chain_offload_priority(basechain) < 0)
1926                 return -EOPNOTSUPP;
1927
1928         flow_block_init(&basechain->flow_block);
1929
1930         return 0;
1931 }
1932
1933 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
1934 {
1935         int err;
1936
1937         err = rhltable_insert_key(&table->chains_ht, chain->name,
1938                                   &chain->rhlhead, nft_chain_ht_params);
1939         if (err)
1940                 return err;
1941
1942         list_add_tail_rcu(&chain->list, &table->chains);
1943
1944         return 0;
1945 }
1946
1947 static u64 chain_id;
1948
1949 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1950                               u8 policy, u32 flags)
1951 {
1952         const struct nlattr * const *nla = ctx->nla;
1953         struct nft_table *table = ctx->table;
1954         struct nft_base_chain *basechain;
1955         struct nft_stats __percpu *stats;
1956         struct net *net = ctx->net;
1957         char name[NFT_NAME_MAXLEN];
1958         struct nft_trans *trans;
1959         struct nft_chain *chain;
1960         struct nft_rule **rules;
1961         int err;
1962
1963         if (table->use == UINT_MAX)
1964                 return -EOVERFLOW;
1965
1966         if (nla[NFTA_CHAIN_HOOK]) {
1967                 struct nft_chain_hook hook;
1968
1969                 if (flags & NFT_CHAIN_BINDING)
1970                         return -EOPNOTSUPP;
1971
1972                 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1973                 if (err < 0)
1974                         return err;
1975
1976                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1977                 if (basechain == NULL) {
1978                         nft_chain_release_hook(&hook);
1979                         return -ENOMEM;
1980                 }
1981                 chain = &basechain->chain;
1982
1983                 if (nla[NFTA_CHAIN_COUNTERS]) {
1984                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1985                         if (IS_ERR(stats)) {
1986                                 nft_chain_release_hook(&hook);
1987                                 kfree(basechain);
1988                                 return PTR_ERR(stats);
1989                         }
1990                         rcu_assign_pointer(basechain->stats, stats);
1991                         static_branch_inc(&nft_counters_enabled);
1992                 }
1993
1994                 err = nft_basechain_init(basechain, family, &hook, flags);
1995                 if (err < 0) {
1996                         nft_chain_release_hook(&hook);
1997                         kfree(basechain);
1998                         return err;
1999                 }
2000         } else {
2001                 if (flags & NFT_CHAIN_BASE)
2002                         return -EINVAL;
2003                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2004                         return -EOPNOTSUPP;
2005
2006                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2007                 if (chain == NULL)
2008                         return -ENOMEM;
2009
2010                 chain->flags = flags;
2011         }
2012         ctx->chain = chain;
2013
2014         INIT_LIST_HEAD(&chain->rules);
2015         chain->handle = nf_tables_alloc_handle(table);
2016         chain->table = table;
2017
2018         if (nla[NFTA_CHAIN_NAME]) {
2019                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2020         } else {
2021                 if (!(flags & NFT_CHAIN_BINDING))
2022                         return -EINVAL;
2023
2024                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2025                 chain->name = kstrdup(name, GFP_KERNEL);
2026         }
2027
2028         if (!chain->name) {
2029                 err = -ENOMEM;
2030                 goto err1;
2031         }
2032
2033         rules = nf_tables_chain_alloc_rules(chain, 0);
2034         if (!rules) {
2035                 err = -ENOMEM;
2036                 goto err1;
2037         }
2038
2039         *rules = NULL;
2040         rcu_assign_pointer(chain->rules_gen_0, rules);
2041         rcu_assign_pointer(chain->rules_gen_1, rules);
2042
2043         err = nf_tables_register_hook(net, table, chain);
2044         if (err < 0)
2045                 goto err1;
2046
2047         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2048         if (IS_ERR(trans)) {
2049                 err = PTR_ERR(trans);
2050                 goto err2;
2051         }
2052
2053         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2054         if (nft_is_base_chain(chain))
2055                 nft_trans_chain_policy(trans) = policy;
2056
2057         err = nft_chain_add(table, chain);
2058         if (err < 0) {
2059                 nft_trans_destroy(trans);
2060                 goto err2;
2061         }
2062
2063         table->use++;
2064
2065         return 0;
2066 err2:
2067         nf_tables_unregister_hook(net, table, chain);
2068 err1:
2069         nf_tables_chain_destroy(ctx);
2070
2071         return err;
2072 }
2073
2074 static bool nft_hook_list_equal(struct list_head *hook_list1,
2075                                 struct list_head *hook_list2)
2076 {
2077         struct nft_hook *hook;
2078         int n = 0, m = 0;
2079
2080         n = 0;
2081         list_for_each_entry(hook, hook_list2, list) {
2082                 if (!nft_hook_list_find(hook_list1, hook))
2083                         return false;
2084
2085                 n++;
2086         }
2087         list_for_each_entry(hook, hook_list1, list)
2088                 m++;
2089
2090         return n == m;
2091 }
2092
2093 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2094                               u32 flags)
2095 {
2096         const struct nlattr * const *nla = ctx->nla;
2097         struct nft_table *table = ctx->table;
2098         struct nft_chain *chain = ctx->chain;
2099         struct nft_base_chain *basechain;
2100         struct nft_stats *stats = NULL;
2101         struct nft_chain_hook hook;
2102         struct nf_hook_ops *ops;
2103         struct nft_trans *trans;
2104         int err;
2105
2106         if (chain->flags ^ flags)
2107                 return -EOPNOTSUPP;
2108
2109         if (nla[NFTA_CHAIN_HOOK]) {
2110                 if (!nft_is_base_chain(chain))
2111                         return -EEXIST;
2112
2113                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2114                                            false);
2115                 if (err < 0)
2116                         return err;
2117
2118                 basechain = nft_base_chain(chain);
2119                 if (basechain->type != hook.type) {
2120                         nft_chain_release_hook(&hook);
2121                         return -EEXIST;
2122                 }
2123
2124                 if (ctx->family == NFPROTO_NETDEV) {
2125                         if (!nft_hook_list_equal(&basechain->hook_list,
2126                                                  &hook.list)) {
2127                                 nft_chain_release_hook(&hook);
2128                                 return -EEXIST;
2129                         }
2130                 } else {
2131                         ops = &basechain->ops;
2132                         if (ops->hooknum != hook.num ||
2133                             ops->priority != hook.priority) {
2134                                 nft_chain_release_hook(&hook);
2135                                 return -EEXIST;
2136                         }
2137                 }
2138                 nft_chain_release_hook(&hook);
2139         }
2140
2141         if (nla[NFTA_CHAIN_HANDLE] &&
2142             nla[NFTA_CHAIN_NAME]) {
2143                 struct nft_chain *chain2;
2144
2145                 chain2 = nft_chain_lookup(ctx->net, table,
2146                                           nla[NFTA_CHAIN_NAME], genmask);
2147                 if (!IS_ERR(chain2))
2148                         return -EEXIST;
2149         }
2150
2151         if (nla[NFTA_CHAIN_COUNTERS]) {
2152                 if (!nft_is_base_chain(chain))
2153                         return -EOPNOTSUPP;
2154
2155                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2156                 if (IS_ERR(stats))
2157                         return PTR_ERR(stats);
2158         }
2159
2160         err = -ENOMEM;
2161         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2162                                 sizeof(struct nft_trans_chain));
2163         if (trans == NULL)
2164                 goto err;
2165
2166         nft_trans_chain_stats(trans) = stats;
2167         nft_trans_chain_update(trans) = true;
2168
2169         if (nla[NFTA_CHAIN_POLICY])
2170                 nft_trans_chain_policy(trans) = policy;
2171         else
2172                 nft_trans_chain_policy(trans) = -1;
2173
2174         if (nla[NFTA_CHAIN_HANDLE] &&
2175             nla[NFTA_CHAIN_NAME]) {
2176                 struct nft_trans *tmp;
2177                 char *name;
2178
2179                 err = -ENOMEM;
2180                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2181                 if (!name)
2182                         goto err;
2183
2184                 err = -EEXIST;
2185                 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2186                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2187                             tmp->ctx.table == table &&
2188                             nft_trans_chain_update(tmp) &&
2189                             nft_trans_chain_name(tmp) &&
2190                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2191                                 kfree(name);
2192                                 goto err;
2193                         }
2194                 }
2195
2196                 nft_trans_chain_name(trans) = name;
2197         }
2198         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2199
2200         return 0;
2201 err:
2202         free_percpu(stats);
2203         kfree(trans);
2204         return err;
2205 }
2206
2207 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2208                                                const struct nlattr *nla)
2209 {
2210         u32 id = ntohl(nla_get_be32(nla));
2211         struct nft_trans *trans;
2212
2213         list_for_each_entry(trans, &net->nft.commit_list, list) {
2214                 struct nft_chain *chain = trans->ctx.chain;
2215
2216                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2217                     id == nft_trans_chain_id(trans))
2218                         return chain;
2219         }
2220         return ERR_PTR(-ENOENT);
2221 }
2222
2223 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2224                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2225                               const struct nlattr * const nla[],
2226                               struct netlink_ext_ack *extack)
2227 {
2228         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2229         u8 genmask = nft_genmask_next(net);
2230         int family = nfmsg->nfgen_family;
2231         struct nft_chain *chain = NULL;
2232         const struct nlattr *attr;
2233         struct nft_table *table;
2234         u8 policy = NF_ACCEPT;
2235         struct nft_ctx ctx;
2236         u64 handle = 0;
2237         u32 flags = 0;
2238
2239         lockdep_assert_held(&net->nft.commit_mutex);
2240
2241         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2242         if (IS_ERR(table)) {
2243                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2244                 return PTR_ERR(table);
2245         }
2246
2247         chain = NULL;
2248         attr = nla[NFTA_CHAIN_NAME];
2249
2250         if (nla[NFTA_CHAIN_HANDLE]) {
2251                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2252                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2253                 if (IS_ERR(chain)) {
2254                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2255                         return PTR_ERR(chain);
2256                 }
2257                 attr = nla[NFTA_CHAIN_HANDLE];
2258         } else if (nla[NFTA_CHAIN_NAME]) {
2259                 chain = nft_chain_lookup(net, table, attr, genmask);
2260                 if (IS_ERR(chain)) {
2261                         if (PTR_ERR(chain) != -ENOENT) {
2262                                 NL_SET_BAD_ATTR(extack, attr);
2263                                 return PTR_ERR(chain);
2264                         }
2265                         chain = NULL;
2266                 }
2267         } else if (!nla[NFTA_CHAIN_ID]) {
2268                 return -EINVAL;
2269         }
2270
2271         if (nla[NFTA_CHAIN_POLICY]) {
2272                 if (chain != NULL &&
2273                     !nft_is_base_chain(chain)) {
2274                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2275                         return -EOPNOTSUPP;
2276                 }
2277
2278                 if (chain == NULL &&
2279                     nla[NFTA_CHAIN_HOOK] == NULL) {
2280                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2281                         return -EOPNOTSUPP;
2282                 }
2283
2284                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2285                 switch (policy) {
2286                 case NF_DROP:
2287                 case NF_ACCEPT:
2288                         break;
2289                 default:
2290                         return -EINVAL;
2291                 }
2292         }
2293
2294         if (nla[NFTA_CHAIN_FLAGS])
2295                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2296         else if (chain)
2297                 flags = chain->flags;
2298
2299         if (flags & ~NFT_CHAIN_FLAGS)
2300                 return -EOPNOTSUPP;
2301
2302         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2303
2304         if (chain != NULL) {
2305                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2306                         NL_SET_BAD_ATTR(extack, attr);
2307                         return -EEXIST;
2308                 }
2309                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2310                         return -EOPNOTSUPP;
2311
2312                 flags |= chain->flags & NFT_CHAIN_BASE;
2313                 return nf_tables_updchain(&ctx, genmask, policy, flags);
2314         }
2315
2316         return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2317 }
2318
2319 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2320                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2321                               const struct nlattr * const nla[],
2322                               struct netlink_ext_ack *extack)
2323 {
2324         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2325         u8 genmask = nft_genmask_next(net);
2326         int family = nfmsg->nfgen_family;
2327         const struct nlattr *attr;
2328         struct nft_table *table;
2329         struct nft_chain *chain;
2330         struct nft_rule *rule;
2331         struct nft_ctx ctx;
2332         u64 handle;
2333         u32 use;
2334         int err;
2335
2336         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2337         if (IS_ERR(table)) {
2338                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2339                 return PTR_ERR(table);
2340         }
2341
2342         if (nla[NFTA_CHAIN_HANDLE]) {
2343                 attr = nla[NFTA_CHAIN_HANDLE];
2344                 handle = be64_to_cpu(nla_get_be64(attr));
2345                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2346         } else {
2347                 attr = nla[NFTA_CHAIN_NAME];
2348                 chain = nft_chain_lookup(net, table, attr, genmask);
2349         }
2350         if (IS_ERR(chain)) {
2351                 NL_SET_BAD_ATTR(extack, attr);
2352                 return PTR_ERR(chain);
2353         }
2354
2355         if (nlh->nlmsg_flags & NLM_F_NONREC &&
2356             chain->use > 0)
2357                 return -EBUSY;
2358
2359         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2360
2361         use = chain->use;
2362         list_for_each_entry(rule, &chain->rules, list) {
2363                 if (!nft_is_active_next(net, rule))
2364                         continue;
2365                 use--;
2366
2367                 err = nft_delrule(&ctx, rule);
2368                 if (err < 0)
2369                         return err;
2370         }
2371
2372         /* There are rules and elements that are still holding references to us,
2373          * we cannot do a recursive removal in this case.
2374          */
2375         if (use > 0) {
2376                 NL_SET_BAD_ATTR(extack, attr);
2377                 return -EBUSY;
2378         }
2379
2380         return nft_delchain(&ctx);
2381 }
2382
2383 /*
2384  * Expressions
2385  */
2386
2387 /**
2388  *      nft_register_expr - register nf_tables expr type
2389  *      @type: expr type
2390  *
2391  *      Registers the expr type for use with nf_tables. Returns zero on
2392  *      success or a negative errno code otherwise.
2393  */
2394 int nft_register_expr(struct nft_expr_type *type)
2395 {
2396         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2397         if (type->family == NFPROTO_UNSPEC)
2398                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2399         else
2400                 list_add_rcu(&type->list, &nf_tables_expressions);
2401         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2402         return 0;
2403 }
2404 EXPORT_SYMBOL_GPL(nft_register_expr);
2405
2406 /**
2407  *      nft_unregister_expr - unregister nf_tables expr type
2408  *      @type: expr type
2409  *
2410  *      Unregisters the expr typefor use with nf_tables.
2411  */
2412 void nft_unregister_expr(struct nft_expr_type *type)
2413 {
2414         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2415         list_del_rcu(&type->list);
2416         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2417 }
2418 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2419
2420 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2421                                                        struct nlattr *nla)
2422 {
2423         const struct nft_expr_type *type, *candidate = NULL;
2424
2425         list_for_each_entry(type, &nf_tables_expressions, list) {
2426                 if (!nla_strcmp(nla, type->name)) {
2427                         if (!type->family && !candidate)
2428                                 candidate = type;
2429                         else if (type->family == family)
2430                                 candidate = type;
2431                 }
2432         }
2433         return candidate;
2434 }
2435
2436 #ifdef CONFIG_MODULES
2437 static int nft_expr_type_request_module(struct net *net, u8 family,
2438                                         struct nlattr *nla)
2439 {
2440         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2441                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2442                 return -EAGAIN;
2443
2444         return 0;
2445 }
2446 #endif
2447
2448 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2449                                                      u8 family,
2450                                                      struct nlattr *nla)
2451 {
2452         const struct nft_expr_type *type;
2453
2454         if (nla == NULL)
2455                 return ERR_PTR(-EINVAL);
2456
2457         type = __nft_expr_type_get(family, nla);
2458         if (type != NULL && try_module_get(type->owner))
2459                 return type;
2460
2461         lockdep_nfnl_nft_mutex_not_held();
2462 #ifdef CONFIG_MODULES
2463         if (type == NULL) {
2464                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2465                         return ERR_PTR(-EAGAIN);
2466
2467                 if (nft_request_module(net, "nft-expr-%.*s",
2468                                        nla_len(nla),
2469                                        (char *)nla_data(nla)) == -EAGAIN)
2470                         return ERR_PTR(-EAGAIN);
2471         }
2472 #endif
2473         return ERR_PTR(-ENOENT);
2474 }
2475
2476 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2477         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2478                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2479         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2480 };
2481
2482 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2483                                     const struct nft_expr *expr)
2484 {
2485         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2486                 goto nla_put_failure;
2487
2488         if (expr->ops->dump) {
2489                 struct nlattr *data = nla_nest_start_noflag(skb,
2490                                                             NFTA_EXPR_DATA);
2491                 if (data == NULL)
2492                         goto nla_put_failure;
2493                 if (expr->ops->dump(skb, expr) < 0)
2494                         goto nla_put_failure;
2495                 nla_nest_end(skb, data);
2496         }
2497
2498         return skb->len;
2499
2500 nla_put_failure:
2501         return -1;
2502 };
2503
2504 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2505                   const struct nft_expr *expr)
2506 {
2507         struct nlattr *nest;
2508
2509         nest = nla_nest_start_noflag(skb, attr);
2510         if (!nest)
2511                 goto nla_put_failure;
2512         if (nf_tables_fill_expr_info(skb, expr) < 0)
2513                 goto nla_put_failure;
2514         nla_nest_end(skb, nest);
2515         return 0;
2516
2517 nla_put_failure:
2518         return -1;
2519 }
2520
2521 struct nft_expr_info {
2522         const struct nft_expr_ops       *ops;
2523         const struct nlattr             *attr;
2524         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2525 };
2526
2527 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2528                                 const struct nlattr *nla,
2529                                 struct nft_expr_info *info)
2530 {
2531         const struct nft_expr_type *type;
2532         const struct nft_expr_ops *ops;
2533         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2534         int err;
2535
2536         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2537                                           nft_expr_policy, NULL);
2538         if (err < 0)
2539                 return err;
2540
2541         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2542         if (IS_ERR(type))
2543                 return PTR_ERR(type);
2544
2545         if (tb[NFTA_EXPR_DATA]) {
2546                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2547                                                   tb[NFTA_EXPR_DATA],
2548                                                   type->policy, NULL);
2549                 if (err < 0)
2550                         goto err1;
2551         } else
2552                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2553
2554         if (type->select_ops != NULL) {
2555                 ops = type->select_ops(ctx,
2556                                        (const struct nlattr * const *)info->tb);
2557                 if (IS_ERR(ops)) {
2558                         err = PTR_ERR(ops);
2559 #ifdef CONFIG_MODULES
2560                         if (err == -EAGAIN)
2561                                 if (nft_expr_type_request_module(ctx->net,
2562                                                                  ctx->family,
2563                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2564                                         err = -ENOENT;
2565 #endif
2566                         goto err1;
2567                 }
2568         } else
2569                 ops = type->ops;
2570
2571         info->attr = nla;
2572         info->ops = ops;
2573
2574         return 0;
2575
2576 err1:
2577         module_put(type->owner);
2578         return err;
2579 }
2580
2581 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2582                              const struct nft_expr_info *info,
2583                              struct nft_expr *expr)
2584 {
2585         const struct nft_expr_ops *ops = info->ops;
2586         int err;
2587
2588         expr->ops = ops;
2589         if (ops->init) {
2590                 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2591                 if (err < 0)
2592                         goto err1;
2593         }
2594
2595         return 0;
2596 err1:
2597         expr->ops = NULL;
2598         return err;
2599 }
2600
2601 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2602                                    struct nft_expr *expr)
2603 {
2604         const struct nft_expr_type *type = expr->ops->type;
2605
2606         if (expr->ops->destroy)
2607                 expr->ops->destroy(ctx, expr);
2608         module_put(type->owner);
2609 }
2610
2611 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2612                                       const struct nlattr *nla)
2613 {
2614         struct nft_expr_info info;
2615         struct nft_expr *expr;
2616         struct module *owner;
2617         int err;
2618
2619         err = nf_tables_expr_parse(ctx, nla, &info);
2620         if (err < 0)
2621                 goto err1;
2622
2623         err = -ENOMEM;
2624         expr = kzalloc(info.ops->size, GFP_KERNEL);
2625         if (expr == NULL)
2626                 goto err2;
2627
2628         err = nf_tables_newexpr(ctx, &info, expr);
2629         if (err < 0)
2630                 goto err3;
2631
2632         return expr;
2633 err3:
2634         kfree(expr);
2635 err2:
2636         owner = info.ops->type->owner;
2637         if (info.ops->type->release_ops)
2638                 info.ops->type->release_ops(info.ops);
2639
2640         module_put(owner);
2641 err1:
2642         return ERR_PTR(err);
2643 }
2644
2645 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2646 {
2647         int err;
2648
2649         if (src->ops->clone) {
2650                 dst->ops = src->ops;
2651                 err = src->ops->clone(dst, src);
2652                 if (err < 0)
2653                         return err;
2654         } else {
2655                 memcpy(dst, src, src->ops->size);
2656         }
2657
2658         __module_get(src->ops->type->owner);
2659
2660         return 0;
2661 }
2662
2663 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2664 {
2665         nf_tables_expr_destroy(ctx, expr);
2666         kfree(expr);
2667 }
2668
2669 /*
2670  * Rules
2671  */
2672
2673 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2674                                           u64 handle)
2675 {
2676         struct nft_rule *rule;
2677
2678         // FIXME: this sucks
2679         list_for_each_entry_rcu(rule, &chain->rules, list) {
2680                 if (handle == rule->handle)
2681                         return rule;
2682         }
2683
2684         return ERR_PTR(-ENOENT);
2685 }
2686
2687 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2688                                         const struct nlattr *nla)
2689 {
2690         if (nla == NULL)
2691                 return ERR_PTR(-EINVAL);
2692
2693         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2694 }
2695
2696 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2697         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2698                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2699         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2700                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2701         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2702         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2703         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2704         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2705         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2706                                     .len = NFT_USERDATA_MAXLEN },
2707         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2708         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2709         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2710 };
2711
2712 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2713                                     u32 portid, u32 seq, int event,
2714                                     u32 flags, int family,
2715                                     const struct nft_table *table,
2716                                     const struct nft_chain *chain,
2717                                     const struct nft_rule *rule,
2718                                     const struct nft_rule *prule)
2719 {
2720         struct nlmsghdr *nlh;
2721         struct nfgenmsg *nfmsg;
2722         const struct nft_expr *expr, *next;
2723         struct nlattr *list;
2724         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2725
2726         nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2727         if (nlh == NULL)
2728                 goto nla_put_failure;
2729
2730         nfmsg = nlmsg_data(nlh);
2731         nfmsg->nfgen_family     = family;
2732         nfmsg->version          = NFNETLINK_V0;
2733         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
2734
2735         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2736                 goto nla_put_failure;
2737         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2738                 goto nla_put_failure;
2739         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2740                          NFTA_RULE_PAD))
2741                 goto nla_put_failure;
2742
2743         if (event != NFT_MSG_DELRULE && prule) {
2744                 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2745                                  cpu_to_be64(prule->handle),
2746                                  NFTA_RULE_PAD))
2747                         goto nla_put_failure;
2748         }
2749
2750         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2751         if (list == NULL)
2752                 goto nla_put_failure;
2753         nft_rule_for_each_expr(expr, next, rule) {
2754                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2755                         goto nla_put_failure;
2756         }
2757         nla_nest_end(skb, list);
2758
2759         if (rule->udata) {
2760                 struct nft_userdata *udata = nft_userdata(rule);
2761                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2762                             udata->data) < 0)
2763                         goto nla_put_failure;
2764         }
2765
2766         nlmsg_end(skb, nlh);
2767         return 0;
2768
2769 nla_put_failure:
2770         nlmsg_trim(skb, nlh);
2771         return -1;
2772 }
2773
2774 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2775                                   const struct nft_rule *rule, int event)
2776 {
2777         struct sk_buff *skb;
2778         int err;
2779         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
2780                               ctx->table->name, ctx->table->handle,
2781                               ctx->chain->name, ctx->chain->handle);
2782
2783         audit_log_nfcfg(buf,
2784                         ctx->family,
2785                         rule->handle,
2786                         event == NFT_MSG_NEWRULE ?
2787                                 AUDIT_NFT_OP_RULE_REGISTER :
2788                                 AUDIT_NFT_OP_RULE_UNREGISTER,
2789                         GFP_KERNEL);
2790         kfree(buf);
2791
2792         if (!ctx->report &&
2793             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2794                 return;
2795
2796         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2797         if (skb == NULL)
2798                 goto err;
2799
2800         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2801                                        event, 0, ctx->family, ctx->table,
2802                                        ctx->chain, rule, NULL);
2803         if (err < 0) {
2804                 kfree_skb(skb);
2805                 goto err;
2806         }
2807
2808         nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2809                        ctx->report, GFP_KERNEL);
2810         return;
2811 err:
2812         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2813 }
2814
2815 struct nft_rule_dump_ctx {
2816         char *table;
2817         char *chain;
2818 };
2819
2820 static int __nf_tables_dump_rules(struct sk_buff *skb,
2821                                   unsigned int *idx,
2822                                   struct netlink_callback *cb,
2823                                   const struct nft_table *table,
2824                                   const struct nft_chain *chain)
2825 {
2826         struct net *net = sock_net(skb->sk);
2827         const struct nft_rule *rule, *prule;
2828         unsigned int s_idx = cb->args[0];
2829
2830         prule = NULL;
2831         list_for_each_entry_rcu(rule, &chain->rules, list) {
2832                 if (!nft_is_active(net, rule))
2833                         goto cont_skip;
2834                 if (*idx < s_idx)
2835                         goto cont;
2836                 if (*idx > s_idx) {
2837                         memset(&cb->args[1], 0,
2838                                         sizeof(cb->args) - sizeof(cb->args[0]));
2839                 }
2840                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2841                                         cb->nlh->nlmsg_seq,
2842                                         NFT_MSG_NEWRULE,
2843                                         NLM_F_MULTI | NLM_F_APPEND,
2844                                         table->family,
2845                                         table, chain, rule, prule) < 0)
2846                         return 1;
2847
2848                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2849 cont:
2850                 prule = rule;
2851 cont_skip:
2852                 (*idx)++;
2853         }
2854         return 0;
2855 }
2856
2857 static int nf_tables_dump_rules(struct sk_buff *skb,
2858                                 struct netlink_callback *cb)
2859 {
2860         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2861         const struct nft_rule_dump_ctx *ctx = cb->data;
2862         struct nft_table *table;
2863         const struct nft_chain *chain;
2864         unsigned int idx = 0;
2865         struct net *net = sock_net(skb->sk);
2866         int family = nfmsg->nfgen_family;
2867
2868         rcu_read_lock();
2869         cb->seq = net->nft.base_seq;
2870
2871         list_for_each_entry_rcu(table, &net->nft.tables, list) {
2872                 if (family != NFPROTO_UNSPEC && family != table->family)
2873                         continue;
2874
2875                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2876                         continue;
2877
2878                 if (ctx && ctx->table && ctx->chain) {
2879                         struct rhlist_head *list, *tmp;
2880
2881                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
2882                                                nft_chain_ht_params);
2883                         if (!list)
2884                                 goto done;
2885
2886                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2887                                 if (!nft_is_active(net, chain))
2888                                         continue;
2889                                 __nf_tables_dump_rules(skb, &idx,
2890                                                        cb, table, chain);
2891                                 break;
2892                         }
2893                         goto done;
2894                 }
2895
2896                 list_for_each_entry_rcu(chain, &table->chains, list) {
2897                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2898                                 goto done;
2899                 }
2900
2901                 if (ctx && ctx->table)
2902                         break;
2903         }
2904 done:
2905         rcu_read_unlock();
2906
2907         cb->args[0] = idx;
2908         return skb->len;
2909 }
2910
2911 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2912 {
2913         const struct nlattr * const *nla = cb->data;
2914         struct nft_rule_dump_ctx *ctx = NULL;
2915
2916         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2917                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2918                 if (!ctx)
2919                         return -ENOMEM;
2920
2921                 if (nla[NFTA_RULE_TABLE]) {
2922                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2923                                                         GFP_ATOMIC);
2924                         if (!ctx->table) {
2925                                 kfree(ctx);
2926                                 return -ENOMEM;
2927                         }
2928                 }
2929                 if (nla[NFTA_RULE_CHAIN]) {
2930                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2931                                                 GFP_ATOMIC);
2932                         if (!ctx->chain) {
2933                                 kfree(ctx->table);
2934                                 kfree(ctx);
2935                                 return -ENOMEM;
2936                         }
2937                 }
2938         }
2939
2940         cb->data = ctx;
2941         return 0;
2942 }
2943
2944 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2945 {
2946         struct nft_rule_dump_ctx *ctx = cb->data;
2947
2948         if (ctx) {
2949                 kfree(ctx->table);
2950                 kfree(ctx->chain);
2951                 kfree(ctx);
2952         }
2953         return 0;
2954 }
2955
2956 /* called with rcu_read_lock held */
2957 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2958                              struct sk_buff *skb, const struct nlmsghdr *nlh,
2959                              const struct nlattr * const nla[],
2960                              struct netlink_ext_ack *extack)
2961 {
2962         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2963         u8 genmask = nft_genmask_cur(net);
2964         const struct nft_chain *chain;
2965         const struct nft_rule *rule;
2966         struct nft_table *table;
2967         struct sk_buff *skb2;
2968         int family = nfmsg->nfgen_family;
2969         int err;
2970
2971         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2972                 struct netlink_dump_control c = {
2973                         .start= nf_tables_dump_rules_start,
2974                         .dump = nf_tables_dump_rules,
2975                         .done = nf_tables_dump_rules_done,
2976                         .module = THIS_MODULE,
2977                         .data = (void *)nla,
2978                 };
2979
2980                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2981         }
2982
2983         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2984         if (IS_ERR(table)) {
2985                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2986                 return PTR_ERR(table);
2987         }
2988
2989         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2990         if (IS_ERR(chain)) {
2991                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2992                 return PTR_ERR(chain);
2993         }
2994
2995         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2996         if (IS_ERR(rule)) {
2997                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2998                 return PTR_ERR(rule);
2999         }
3000
3001         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3002         if (!skb2)
3003                 return -ENOMEM;
3004
3005         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3006                                        nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3007                                        family, table, chain, rule, NULL);
3008         if (err < 0)
3009                 goto err;
3010
3011         return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3012
3013 err:
3014         kfree_skb(skb2);
3015         return err;
3016 }
3017
3018 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3019                                    struct nft_rule *rule)
3020 {
3021         struct nft_expr *expr, *next;
3022
3023         /*
3024          * Careful: some expressions might not be initialized in case this
3025          * is called on error from nf_tables_newrule().
3026          */
3027         expr = nft_expr_first(rule);
3028         while (expr != nft_expr_last(rule) && expr->ops) {
3029                 next = nft_expr_next(expr);
3030                 nf_tables_expr_destroy(ctx, expr);
3031                 expr = next;
3032         }
3033         kfree(rule);
3034 }
3035
3036 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3037 {
3038         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3039         nf_tables_rule_destroy(ctx, rule);
3040 }
3041
3042 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3043 {
3044         struct nft_expr *expr, *last;
3045         const struct nft_data *data;
3046         struct nft_rule *rule;
3047         int err;
3048
3049         if (ctx->level == NFT_JUMP_STACK_SIZE)
3050                 return -EMLINK;
3051
3052         list_for_each_entry(rule, &chain->rules, list) {
3053                 if (!nft_is_active_next(ctx->net, rule))
3054                         continue;
3055
3056                 nft_rule_for_each_expr(expr, last, rule) {
3057                         if (!expr->ops->validate)
3058                                 continue;
3059
3060                         err = expr->ops->validate(ctx, expr, &data);
3061                         if (err < 0)
3062                                 return err;
3063                 }
3064         }
3065
3066         return 0;
3067 }
3068 EXPORT_SYMBOL_GPL(nft_chain_validate);
3069
3070 static int nft_table_validate(struct net *net, const struct nft_table *table)
3071 {
3072         struct nft_chain *chain;
3073         struct nft_ctx ctx = {
3074                 .net    = net,
3075                 .family = table->family,
3076         };
3077         int err;
3078
3079         list_for_each_entry(chain, &table->chains, list) {
3080                 if (!nft_is_base_chain(chain))
3081                         continue;
3082
3083                 ctx.chain = chain;
3084                 err = nft_chain_validate(&ctx, chain);
3085                 if (err < 0)
3086                         return err;
3087         }
3088
3089         return 0;
3090 }
3091
3092 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3093                                              const struct nlattr *nla);
3094
3095 #define NFT_RULE_MAXEXPRS       128
3096
3097 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3098                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3099                              const struct nlattr * const nla[],
3100                              struct netlink_ext_ack *extack)
3101 {
3102         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3103         u8 genmask = nft_genmask_next(net);
3104         struct nft_expr_info *info = NULL;
3105         int family = nfmsg->nfgen_family;
3106         struct nft_flow_rule *flow;
3107         struct nft_table *table;
3108         struct nft_chain *chain;
3109         struct nft_rule *rule, *old_rule = NULL;
3110         struct nft_userdata *udata;
3111         struct nft_trans *trans = NULL;
3112         struct nft_expr *expr;
3113         struct nft_ctx ctx;
3114         struct nlattr *tmp;
3115         unsigned int size, i, n, ulen = 0, usize = 0;
3116         int err, rem;
3117         u64 handle, pos_handle;
3118
3119         lockdep_assert_held(&net->nft.commit_mutex);
3120
3121         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3122         if (IS_ERR(table)) {
3123                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3124                 return PTR_ERR(table);
3125         }
3126
3127         if (nla[NFTA_RULE_CHAIN]) {
3128                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3129                                          genmask);
3130                 if (IS_ERR(chain)) {
3131                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3132                         return PTR_ERR(chain);
3133                 }
3134                 if (nft_chain_is_bound(chain))
3135                         return -EOPNOTSUPP;
3136
3137         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3138                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3139                 if (IS_ERR(chain)) {
3140                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3141                         return PTR_ERR(chain);
3142                 }
3143         } else {
3144                 return -EINVAL;
3145         }
3146
3147         if (nla[NFTA_RULE_HANDLE]) {
3148                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3149                 rule = __nft_rule_lookup(chain, handle);
3150                 if (IS_ERR(rule)) {
3151                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3152                         return PTR_ERR(rule);
3153                 }
3154
3155                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3156                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3157                         return -EEXIST;
3158                 }
3159                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3160                         old_rule = rule;
3161                 else
3162                         return -EOPNOTSUPP;
3163         } else {
3164                 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3165                     nlh->nlmsg_flags & NLM_F_REPLACE)
3166                         return -EINVAL;
3167                 handle = nf_tables_alloc_handle(table);
3168
3169                 if (chain->use == UINT_MAX)
3170                         return -EOVERFLOW;
3171
3172                 if (nla[NFTA_RULE_POSITION]) {
3173                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3174                         old_rule = __nft_rule_lookup(chain, pos_handle);
3175                         if (IS_ERR(old_rule)) {
3176                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3177                                 return PTR_ERR(old_rule);
3178                         }
3179                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3180                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3181                         if (IS_ERR(old_rule)) {
3182                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3183                                 return PTR_ERR(old_rule);
3184                         }
3185                 }
3186         }
3187
3188         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3189
3190         n = 0;
3191         size = 0;
3192         if (nla[NFTA_RULE_EXPRESSIONS]) {
3193                 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3194                                       sizeof(struct nft_expr_info),
3195                                       GFP_KERNEL);
3196                 if (!info)
3197                         return -ENOMEM;
3198
3199                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3200                         err = -EINVAL;
3201                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3202                                 goto err1;
3203                         if (n == NFT_RULE_MAXEXPRS)
3204                                 goto err1;
3205                         err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3206                         if (err < 0)
3207                                 goto err1;
3208                         size += info[n].ops->size;
3209                         n++;
3210                 }
3211         }
3212         /* Check for overflow of dlen field */
3213         err = -EFBIG;
3214         if (size >= 1 << 12)
3215                 goto err1;
3216
3217         if (nla[NFTA_RULE_USERDATA]) {
3218                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3219                 if (ulen > 0)
3220                         usize = sizeof(struct nft_userdata) + ulen;
3221         }
3222
3223         err = -ENOMEM;
3224         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3225         if (rule == NULL)
3226                 goto err1;
3227
3228         nft_activate_next(net, rule);
3229
3230         rule->handle = handle;
3231         rule->dlen   = size;
3232         rule->udata  = ulen ? 1 : 0;
3233
3234         if (ulen) {
3235                 udata = nft_userdata(rule);
3236                 udata->len = ulen - 1;
3237                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3238         }
3239
3240         expr = nft_expr_first(rule);
3241         for (i = 0; i < n; i++) {
3242                 err = nf_tables_newexpr(&ctx, &info[i], expr);
3243                 if (err < 0) {
3244                         NL_SET_BAD_ATTR(extack, info[i].attr);
3245                         goto err2;
3246                 }
3247
3248                 if (info[i].ops->validate)
3249                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3250
3251                 info[i].ops = NULL;
3252                 expr = nft_expr_next(expr);
3253         }
3254
3255         if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3256                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3257                 if (trans == NULL) {
3258                         err = -ENOMEM;
3259                         goto err2;
3260                 }
3261                 err = nft_delrule(&ctx, old_rule);
3262                 if (err < 0) {
3263                         nft_trans_destroy(trans);
3264                         goto err2;
3265                 }
3266
3267                 list_add_tail_rcu(&rule->list, &old_rule->list);
3268         } else {
3269                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3270                 if (!trans) {
3271                         err = -ENOMEM;
3272                         goto err2;
3273                 }
3274
3275                 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3276                         if (old_rule)
3277                                 list_add_rcu(&rule->list, &old_rule->list);
3278                         else
3279                                 list_add_tail_rcu(&rule->list, &chain->rules);
3280                  } else {
3281                         if (old_rule)
3282                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3283                         else
3284                                 list_add_rcu(&rule->list, &chain->rules);
3285                 }
3286         }
3287         kvfree(info);
3288         chain->use++;
3289
3290         if (net->nft.validate_state == NFT_VALIDATE_DO)
3291                 return nft_table_validate(net, table);
3292
3293         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3294                 flow = nft_flow_rule_create(net, rule);
3295                 if (IS_ERR(flow))
3296                         return PTR_ERR(flow);
3297
3298                 nft_trans_flow_rule(trans) = flow;
3299         }
3300
3301         return 0;
3302 err2:
3303         nf_tables_rule_release(&ctx, rule);
3304 err1:
3305         for (i = 0; i < n; i++) {
3306                 if (info[i].ops) {
3307                         module_put(info[i].ops->type->owner);
3308                         if (info[i].ops->type->release_ops)
3309                                 info[i].ops->type->release_ops(info[i].ops);
3310                 }
3311         }
3312         kvfree(info);
3313         return err;
3314 }
3315
3316 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3317                                              const struct nlattr *nla)
3318 {
3319         u32 id = ntohl(nla_get_be32(nla));
3320         struct nft_trans *trans;
3321
3322         list_for_each_entry(trans, &net->nft.commit_list, list) {
3323                 struct nft_rule *rule = nft_trans_rule(trans);
3324
3325                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3326                     id == nft_trans_rule_id(trans))
3327                         return rule;
3328         }
3329         return ERR_PTR(-ENOENT);
3330 }
3331
3332 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3333                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3334                              const struct nlattr * const nla[],
3335                              struct netlink_ext_ack *extack)
3336 {
3337         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3338         u8 genmask = nft_genmask_next(net);
3339         struct nft_table *table;
3340         struct nft_chain *chain = NULL;
3341         struct nft_rule *rule;
3342         int family = nfmsg->nfgen_family, err = 0;
3343         struct nft_ctx ctx;
3344
3345         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3346         if (IS_ERR(table)) {
3347                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3348                 return PTR_ERR(table);
3349         }
3350
3351         if (nla[NFTA_RULE_CHAIN]) {
3352                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3353                                          genmask);
3354                 if (IS_ERR(chain)) {
3355                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3356                         return PTR_ERR(chain);
3357                 }
3358                 if (nft_chain_is_bound(chain))
3359                         return -EOPNOTSUPP;
3360         }
3361
3362         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3363
3364         if (chain) {
3365                 if (nla[NFTA_RULE_HANDLE]) {
3366                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3367                         if (IS_ERR(rule)) {
3368                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3369                                 return PTR_ERR(rule);
3370                         }
3371
3372                         err = nft_delrule(&ctx, rule);
3373                 } else if (nla[NFTA_RULE_ID]) {
3374                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3375                         if (IS_ERR(rule)) {
3376                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3377                                 return PTR_ERR(rule);
3378                         }
3379
3380                         err = nft_delrule(&ctx, rule);
3381                 } else {
3382                         err = nft_delrule_by_chain(&ctx);
3383                 }
3384         } else {
3385                 list_for_each_entry(chain, &table->chains, list) {
3386                         if (!nft_is_active_next(net, chain))
3387                                 continue;
3388
3389                         ctx.chain = chain;
3390                         err = nft_delrule_by_chain(&ctx);
3391                         if (err < 0)
3392                                 break;
3393                 }
3394         }
3395
3396         return err;
3397 }
3398
3399 /*
3400  * Sets
3401  */
3402 static const struct nft_set_type *nft_set_types[] = {
3403         &nft_set_hash_fast_type,
3404         &nft_set_hash_type,
3405         &nft_set_rhash_type,
3406         &nft_set_bitmap_type,
3407         &nft_set_rbtree_type,
3408 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3409         &nft_set_pipapo_avx2_type,
3410 #endif
3411         &nft_set_pipapo_type,
3412 };
3413
3414 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3415                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3416                                  NFT_SET_EVAL)
3417
3418 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3419 {
3420         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3421 }
3422
3423 /*
3424  * Select a set implementation based on the data characteristics and the
3425  * given policy. The total memory use might not be known if no size is
3426  * given, in that case the amount of memory per element is used.
3427  */
3428 static const struct nft_set_ops *
3429 nft_select_set_ops(const struct nft_ctx *ctx,
3430                    const struct nlattr * const nla[],
3431                    const struct nft_set_desc *desc,
3432                    enum nft_set_policies policy)
3433 {
3434         const struct nft_set_ops *ops, *bops;
3435         struct nft_set_estimate est, best;
3436         const struct nft_set_type *type;
3437         u32 flags = 0;
3438         int i;
3439
3440         lockdep_assert_held(&ctx->net->nft.commit_mutex);
3441         lockdep_nfnl_nft_mutex_not_held();
3442
3443         if (nla[NFTA_SET_FLAGS] != NULL)
3444                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3445
3446         bops        = NULL;
3447         best.size   = ~0;
3448         best.lookup = ~0;
3449         best.space  = ~0;
3450
3451         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3452                 type = nft_set_types[i];
3453                 ops = &type->ops;
3454
3455                 if (!nft_set_ops_candidate(type, flags))
3456                         continue;
3457                 if (!ops->estimate(desc, flags, &est))
3458                         continue;
3459
3460                 switch (policy) {
3461                 case NFT_SET_POL_PERFORMANCE:
3462                         if (est.lookup < best.lookup)
3463                                 break;
3464                         if (est.lookup == best.lookup &&
3465                             est.space < best.space)
3466                                 break;
3467                         continue;
3468                 case NFT_SET_POL_MEMORY:
3469                         if (!desc->size) {
3470                                 if (est.space < best.space)
3471                                         break;
3472                                 if (est.space == best.space &&
3473                                     est.lookup < best.lookup)
3474                                         break;
3475                         } else if (est.size < best.size || !bops) {
3476                                 break;
3477                         }
3478                         continue;
3479                 default:
3480                         break;
3481                 }
3482
3483                 bops = ops;
3484                 best = est;
3485         }
3486
3487         if (bops != NULL)
3488                 return bops;
3489
3490         return ERR_PTR(-EOPNOTSUPP);
3491 }
3492
3493 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3494         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3495                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3496         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3497                                             .len = NFT_SET_MAXNAMELEN - 1 },
3498         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3499         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3500         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3501         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3502         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3503         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3504         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3505         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3506         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3507         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3508         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3509                                             .len  = NFT_USERDATA_MAXLEN },
3510         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3511         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3512         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3513 };
3514
3515 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3516         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3517         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3518 };
3519
3520 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3521                                      const struct sk_buff *skb,
3522                                      const struct nlmsghdr *nlh,
3523                                      const struct nlattr * const nla[],
3524                                      struct netlink_ext_ack *extack,
3525                                      u8 genmask)
3526 {
3527         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3528         int family = nfmsg->nfgen_family;
3529         struct nft_table *table = NULL;
3530
3531         if (nla[NFTA_SET_TABLE] != NULL) {
3532                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3533                                          genmask);
3534                 if (IS_ERR(table)) {
3535                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3536                         return PTR_ERR(table);
3537                 }
3538         }
3539
3540         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3541         return 0;
3542 }
3543
3544 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3545                                       const struct nlattr *nla, u8 genmask)
3546 {
3547         struct nft_set *set;
3548
3549         if (nla == NULL)
3550                 return ERR_PTR(-EINVAL);
3551
3552         list_for_each_entry_rcu(set, &table->sets, list) {
3553                 if (!nla_strcmp(nla, set->name) &&
3554                     nft_active_genmask(set, genmask))
3555                         return set;
3556         }
3557         return ERR_PTR(-ENOENT);
3558 }
3559
3560 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3561                                                const struct nlattr *nla,
3562                                                u8 genmask)
3563 {
3564         struct nft_set *set;
3565
3566         list_for_each_entry(set, &table->sets, list) {
3567                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3568                     nft_active_genmask(set, genmask))
3569                         return set;
3570         }
3571         return ERR_PTR(-ENOENT);
3572 }
3573
3574 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3575                                            const struct nlattr *nla, u8 genmask)
3576 {
3577         struct nft_trans *trans;
3578         u32 id = ntohl(nla_get_be32(nla));
3579
3580         list_for_each_entry(trans, &net->nft.commit_list, list) {
3581                 if (trans->msg_type == NFT_MSG_NEWSET) {
3582                         struct nft_set *set = nft_trans_set(trans);
3583
3584                         if (id == nft_trans_set_id(trans) &&
3585                             nft_active_genmask(set, genmask))
3586                                 return set;
3587                 }
3588         }
3589         return ERR_PTR(-ENOENT);
3590 }
3591
3592 struct nft_set *nft_set_lookup_global(const struct net *net,
3593                                       const struct nft_table *table,
3594                                       const struct nlattr *nla_set_name,
3595                                       const struct nlattr *nla_set_id,
3596                                       u8 genmask)
3597 {
3598         struct nft_set *set;
3599
3600         set = nft_set_lookup(table, nla_set_name, genmask);
3601         if (IS_ERR(set)) {
3602                 if (!nla_set_id)
3603                         return set;
3604
3605                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3606         }
3607         return set;
3608 }
3609 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3610
3611 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3612                                     const char *name)
3613 {
3614         const struct nft_set *i;
3615         const char *p;
3616         unsigned long *inuse;
3617         unsigned int n = 0, min = 0;
3618
3619         p = strchr(name, '%');
3620         if (p != NULL) {
3621                 if (p[1] != 'd' || strchr(p + 2, '%'))
3622                         return -EINVAL;
3623
3624                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3625                 if (inuse == NULL)
3626                         return -ENOMEM;
3627 cont:
3628                 list_for_each_entry(i, &ctx->table->sets, list) {
3629                         int tmp;
3630
3631                         if (!nft_is_active_next(ctx->net, set))
3632                                 continue;
3633                         if (!sscanf(i->name, name, &tmp))
3634                                 continue;
3635                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3636                                 continue;
3637
3638                         set_bit(tmp - min, inuse);
3639                 }
3640
3641                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3642                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3643                         min += BITS_PER_BYTE * PAGE_SIZE;
3644                         memset(inuse, 0, PAGE_SIZE);
3645                         goto cont;
3646                 }
3647                 free_page((unsigned long)inuse);
3648         }
3649
3650         set->name = kasprintf(GFP_KERNEL, name, min + n);
3651         if (!set->name)
3652                 return -ENOMEM;
3653
3654         list_for_each_entry(i, &ctx->table->sets, list) {
3655                 if (!nft_is_active_next(ctx->net, i))
3656                         continue;
3657                 if (!strcmp(set->name, i->name)) {
3658                         kfree(set->name);
3659                         set->name = NULL;
3660                         return -ENFILE;
3661                 }
3662         }
3663         return 0;
3664 }
3665
3666 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3667 {
3668         u64 ms = be64_to_cpu(nla_get_be64(nla));
3669         u64 max = (u64)(~((u64)0));
3670
3671         max = div_u64(max, NSEC_PER_MSEC);
3672         if (ms >= max)
3673                 return -ERANGE;
3674
3675         ms *= NSEC_PER_MSEC;
3676         *result = nsecs_to_jiffies64(ms);
3677         return 0;
3678 }
3679
3680 static __be64 nf_jiffies64_to_msecs(u64 input)
3681 {
3682         return cpu_to_be64(jiffies64_to_msecs(input));
3683 }
3684
3685 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3686                                      const struct nft_set *set)
3687 {
3688         struct nlattr *concat, *field;
3689         int i;
3690
3691         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3692         if (!concat)
3693                 return -ENOMEM;
3694
3695         for (i = 0; i < set->field_count; i++) {
3696                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3697                 if (!field)
3698                         return -ENOMEM;
3699
3700                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3701                                  htonl(set->field_len[i])))
3702                         return -ENOMEM;
3703
3704                 nla_nest_end(skb, field);
3705         }
3706
3707         nla_nest_end(skb, concat);
3708
3709         return 0;
3710 }
3711
3712 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3713                               const struct nft_set *set, u16 event, u16 flags)
3714 {
3715         struct nfgenmsg *nfmsg;
3716         struct nlmsghdr *nlh;
3717         u32 portid = ctx->portid;
3718         struct nlattr *nest;
3719         u32 seq = ctx->seq;
3720
3721         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3722         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3723                         flags);
3724         if (nlh == NULL)
3725                 goto nla_put_failure;
3726
3727         nfmsg = nlmsg_data(nlh);
3728         nfmsg->nfgen_family     = ctx->family;
3729         nfmsg->version          = NFNETLINK_V0;
3730         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
3731
3732         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3733                 goto nla_put_failure;
3734         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3735                 goto nla_put_failure;
3736         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3737                          NFTA_SET_PAD))
3738                 goto nla_put_failure;
3739         if (set->flags != 0)
3740                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3741                         goto nla_put_failure;
3742
3743         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3744                 goto nla_put_failure;
3745         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3746                 goto nla_put_failure;
3747         if (set->flags & NFT_SET_MAP) {
3748                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3749                         goto nla_put_failure;
3750                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3751                         goto nla_put_failure;
3752         }
3753         if (set->flags & NFT_SET_OBJECT &&
3754             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3755                 goto nla_put_failure;
3756
3757         if (set->timeout &&
3758             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3759                          nf_jiffies64_to_msecs(set->timeout),
3760                          NFTA_SET_PAD))
3761                 goto nla_put_failure;
3762         if (set->gc_int &&
3763             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3764                 goto nla_put_failure;
3765
3766         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3767                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3768                         goto nla_put_failure;
3769         }
3770
3771         if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3772                 goto nla_put_failure;
3773
3774         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3775         if (!nest)
3776                 goto nla_put_failure;
3777         if (set->size &&
3778             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3779                 goto nla_put_failure;
3780
3781         if (set->field_count > 1 &&
3782             nf_tables_fill_set_concat(skb, set))
3783                 goto nla_put_failure;
3784
3785         nla_nest_end(skb, nest);
3786
3787         if (set->expr) {
3788                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3789                 if (nf_tables_fill_expr_info(skb, set->expr) < 0)
3790                         goto nla_put_failure;
3791
3792                 nla_nest_end(skb, nest);
3793         }
3794
3795         nlmsg_end(skb, nlh);
3796         return 0;
3797
3798 nla_put_failure:
3799         nlmsg_trim(skb, nlh);
3800         return -1;
3801 }
3802
3803 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3804                                  const struct nft_set *set, int event,
3805                                  gfp_t gfp_flags)
3806 {
3807         struct sk_buff *skb;
3808         u32 portid = ctx->portid;
3809         int err;
3810         char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
3811                               ctx->table->name, ctx->table->handle,
3812                               set->name, set->handle);
3813
3814         audit_log_nfcfg(buf,
3815                         ctx->family,
3816                         set->field_count,
3817                         event == NFT_MSG_NEWSET ?
3818                                 AUDIT_NFT_OP_SET_REGISTER :
3819                                 AUDIT_NFT_OP_SET_UNREGISTER,
3820                         gfp_flags);
3821         kfree(buf);
3822
3823         if (!ctx->report &&
3824             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3825                 return;
3826
3827         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3828         if (skb == NULL)
3829                 goto err;
3830
3831         err = nf_tables_fill_set(skb, ctx, set, event, 0);
3832         if (err < 0) {
3833                 kfree_skb(skb);
3834                 goto err;
3835         }
3836
3837         nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3838                        gfp_flags);
3839         return;
3840 err:
3841         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3842 }
3843
3844 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3845 {
3846         const struct nft_set *set;
3847         unsigned int idx, s_idx = cb->args[0];
3848         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3849         struct net *net = sock_net(skb->sk);
3850         struct nft_ctx *ctx = cb->data, ctx_set;
3851
3852         if (cb->args[1])
3853                 return skb->len;
3854
3855         rcu_read_lock();
3856         cb->seq = net->nft.base_seq;
3857
3858         list_for_each_entry_rcu(table, &net->nft.tables, list) {
3859                 if (ctx->family != NFPROTO_UNSPEC &&
3860                     ctx->family != table->family)
3861                         continue;
3862
3863                 if (ctx->table && ctx->table != table)
3864                         continue;
3865
3866                 if (cur_table) {
3867                         if (cur_table != table)
3868                                 continue;
3869
3870                         cur_table = NULL;
3871                 }
3872                 idx = 0;
3873                 list_for_each_entry_rcu(set, &table->sets, list) {
3874                         if (idx < s_idx)
3875                                 goto cont;
3876                         if (!nft_is_active(net, set))
3877                                 goto cont;
3878
3879                         ctx_set = *ctx;
3880                         ctx_set.table = table;
3881                         ctx_set.family = table->family;
3882
3883                         if (nf_tables_fill_set(skb, &ctx_set, set,
3884                                                NFT_MSG_NEWSET,
3885                                                NLM_F_MULTI) < 0) {
3886                                 cb->args[0] = idx;
3887                                 cb->args[2] = (unsigned long) table;
3888                                 goto done;
3889                         }
3890                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3891 cont:
3892                         idx++;
3893                 }
3894                 if (s_idx)
3895                         s_idx = 0;
3896         }
3897         cb->args[1] = 1;
3898 done:
3899         rcu_read_unlock();
3900         return skb->len;
3901 }
3902
3903 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3904 {
3905         struct nft_ctx *ctx_dump = NULL;
3906
3907         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3908         if (ctx_dump == NULL)
3909                 return -ENOMEM;
3910
3911         cb->data = ctx_dump;
3912         return 0;
3913 }
3914
3915 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3916 {
3917         kfree(cb->data);
3918         return 0;
3919 }
3920
3921 /* called with rcu_read_lock held */
3922 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3923                             struct sk_buff *skb, const struct nlmsghdr *nlh,
3924                             const struct nlattr * const nla[],
3925                             struct netlink_ext_ack *extack)
3926 {
3927         u8 genmask = nft_genmask_cur(net);
3928         const struct nft_set *set;
3929         struct nft_ctx ctx;
3930         struct sk_buff *skb2;
3931         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3932         int err;
3933
3934         /* Verify existence before starting dump */
3935         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3936                                         genmask);
3937         if (err < 0)
3938                 return err;
3939
3940         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3941                 struct netlink_dump_control c = {
3942                         .start = nf_tables_dump_sets_start,
3943                         .dump = nf_tables_dump_sets,
3944                         .done = nf_tables_dump_sets_done,
3945                         .data = &ctx,
3946                         .module = THIS_MODULE,
3947                 };
3948
3949                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3950         }
3951
3952         /* Only accept unspec with dump */
3953         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3954                 return -EAFNOSUPPORT;
3955         if (!nla[NFTA_SET_TABLE])
3956                 return -EINVAL;
3957
3958         set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3959         if (IS_ERR(set))
3960                 return PTR_ERR(set);
3961
3962         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3963         if (skb2 == NULL)
3964                 return -ENOMEM;
3965
3966         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3967         if (err < 0)
3968                 goto err;
3969
3970         return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3971
3972 err:
3973         kfree_skb(skb2);
3974         return err;
3975 }
3976
3977 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
3978         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
3979 };
3980
3981 static int nft_set_desc_concat_parse(const struct nlattr *attr,
3982                                      struct nft_set_desc *desc)
3983 {
3984         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
3985         u32 len;
3986         int err;
3987
3988         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
3989                                           nft_concat_policy, NULL);
3990         if (err < 0)
3991                 return err;
3992
3993         if (!tb[NFTA_SET_FIELD_LEN])
3994                 return -EINVAL;
3995
3996         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
3997
3998         if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
3999                 return -E2BIG;
4000
4001         desc->field_len[desc->field_count++] = len;
4002
4003         return 0;
4004 }
4005
4006 static int nft_set_desc_concat(struct nft_set_desc *desc,
4007                                const struct nlattr *nla)
4008 {
4009         struct nlattr *attr;
4010         int rem, err;
4011
4012         nla_for_each_nested(attr, nla, rem) {
4013                 if (nla_type(attr) != NFTA_LIST_ELEM)
4014                         return -EINVAL;
4015
4016                 err = nft_set_desc_concat_parse(attr, desc);
4017                 if (err < 0)
4018                         return err;
4019         }
4020
4021         return 0;
4022 }
4023
4024 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4025                                     const struct nlattr *nla)
4026 {
4027         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4028         int err;
4029
4030         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4031                                           nft_set_desc_policy, NULL);
4032         if (err < 0)
4033                 return err;
4034
4035         if (da[NFTA_SET_DESC_SIZE] != NULL)
4036                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4037         if (da[NFTA_SET_DESC_CONCAT])
4038                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4039
4040         return err;
4041 }
4042
4043 static int nf_tables_newset(struct net *net, struct sock *nlsk,
4044                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4045                             const struct nlattr * const nla[],
4046                             struct netlink_ext_ack *extack)
4047 {
4048         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4049         u8 genmask = nft_genmask_next(net);
4050         int family = nfmsg->nfgen_family;
4051         const struct nft_set_ops *ops;
4052         struct nft_expr *expr = NULL;
4053         struct nft_table *table;
4054         struct nft_set *set;
4055         struct nft_ctx ctx;
4056         char *name;
4057         u64 size;
4058         u64 timeout;
4059         u32 ktype, dtype, flags, policy, gc_int, objtype;
4060         struct nft_set_desc desc;
4061         unsigned char *udata;
4062         u16 udlen;
4063         int err;
4064         int i;
4065
4066         if (nla[NFTA_SET_TABLE] == NULL ||
4067             nla[NFTA_SET_NAME] == NULL ||
4068             nla[NFTA_SET_KEY_LEN] == NULL ||
4069             nla[NFTA_SET_ID] == NULL)
4070                 return -EINVAL;
4071
4072         memset(&desc, 0, sizeof(desc));
4073
4074         ktype = NFT_DATA_VALUE;
4075         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4076                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4077                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4078                         return -EINVAL;
4079         }
4080
4081         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4082         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4083                 return -EINVAL;
4084
4085         flags = 0;
4086         if (nla[NFTA_SET_FLAGS] != NULL) {
4087                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4088                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4089                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4090                               NFT_SET_MAP | NFT_SET_EVAL |
4091                               NFT_SET_OBJECT | NFT_SET_CONCAT))
4092                         return -EOPNOTSUPP;
4093                 /* Only one of these operations is supported */
4094                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4095                              (NFT_SET_MAP | NFT_SET_OBJECT))
4096                         return -EOPNOTSUPP;
4097                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4098                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4099                         return -EOPNOTSUPP;
4100         }
4101
4102         dtype = 0;
4103         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4104                 if (!(flags & NFT_SET_MAP))
4105                         return -EINVAL;
4106
4107                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4108                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4109                     dtype != NFT_DATA_VERDICT)
4110                         return -EINVAL;
4111
4112                 if (dtype != NFT_DATA_VERDICT) {
4113                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4114                                 return -EINVAL;
4115                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4116                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4117                                 return -EINVAL;
4118                 } else
4119                         desc.dlen = sizeof(struct nft_verdict);
4120         } else if (flags & NFT_SET_MAP)
4121                 return -EINVAL;
4122
4123         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4124                 if (!(flags & NFT_SET_OBJECT))
4125                         return -EINVAL;
4126
4127                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4128                 if (objtype == NFT_OBJECT_UNSPEC ||
4129                     objtype > NFT_OBJECT_MAX)
4130                         return -EOPNOTSUPP;
4131         } else if (flags & NFT_SET_OBJECT)
4132                 return -EINVAL;
4133         else
4134                 objtype = NFT_OBJECT_UNSPEC;
4135
4136         timeout = 0;
4137         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4138                 if (!(flags & NFT_SET_TIMEOUT))
4139                         return -EINVAL;
4140
4141                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4142                 if (err)
4143                         return err;
4144         }
4145         gc_int = 0;
4146         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4147                 if (!(flags & NFT_SET_TIMEOUT))
4148                         return -EINVAL;
4149                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4150         }
4151
4152         policy = NFT_SET_POL_PERFORMANCE;
4153         if (nla[NFTA_SET_POLICY] != NULL)
4154                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4155
4156         if (nla[NFTA_SET_DESC] != NULL) {
4157                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4158                 if (err < 0)
4159                         return err;
4160         }
4161
4162         if (nla[NFTA_SET_EXPR])
4163                 desc.expr = true;
4164
4165         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
4166         if (IS_ERR(table)) {
4167                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4168                 return PTR_ERR(table);
4169         }
4170
4171         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4172
4173         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4174         if (IS_ERR(set)) {
4175                 if (PTR_ERR(set) != -ENOENT) {
4176                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4177                         return PTR_ERR(set);
4178                 }
4179         } else {
4180                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4181                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4182                         return -EEXIST;
4183                 }
4184                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4185                         return -EOPNOTSUPP;
4186
4187                 return 0;
4188         }
4189
4190         if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4191                 return -ENOENT;
4192
4193         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4194         if (IS_ERR(ops))
4195                 return PTR_ERR(ops);
4196
4197         udlen = 0;
4198         if (nla[NFTA_SET_USERDATA])
4199                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4200
4201         size = 0;
4202         if (ops->privsize != NULL)
4203                 size = ops->privsize(nla, &desc);
4204
4205         set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4206         if (!set)
4207                 return -ENOMEM;
4208
4209         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4210         if (!name) {
4211                 err = -ENOMEM;
4212                 goto err_set_name;
4213         }
4214
4215         err = nf_tables_set_alloc_name(&ctx, set, name);
4216         kfree(name);
4217         if (err < 0)
4218                 goto err_set_alloc_name;
4219
4220         if (nla[NFTA_SET_EXPR]) {
4221                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4222                 if (IS_ERR(expr)) {
4223                         err = PTR_ERR(expr);
4224                         goto err_set_alloc_name;
4225                 }
4226         }
4227
4228         udata = NULL;
4229         if (udlen) {
4230                 udata = set->data + size;
4231                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4232         }
4233
4234         INIT_LIST_HEAD(&set->bindings);
4235         set->table = table;
4236         write_pnet(&set->net, net);
4237         set->ops   = ops;
4238         set->ktype = ktype;
4239         set->klen  = desc.klen;
4240         set->dtype = dtype;
4241         set->objtype = objtype;
4242         set->dlen  = desc.dlen;
4243         set->expr = expr;
4244         set->flags = flags;
4245         set->size  = desc.size;
4246         set->policy = policy;
4247         set->udlen  = udlen;
4248         set->udata  = udata;
4249         set->timeout = timeout;
4250         set->gc_int = gc_int;
4251         set->handle = nf_tables_alloc_handle(table);
4252
4253         set->field_count = desc.field_count;
4254         for (i = 0; i < desc.field_count; i++)
4255                 set->field_len[i] = desc.field_len[i];
4256
4257         err = ops->init(set, &desc, nla);
4258         if (err < 0)
4259                 goto err_set_init;
4260
4261         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4262         if (err < 0)
4263                 goto err_set_trans;
4264
4265         list_add_tail_rcu(&set->list, &table->sets);
4266         table->use++;
4267         return 0;
4268
4269 err_set_trans:
4270         ops->destroy(set);
4271 err_set_init:
4272         if (expr)
4273                 nft_expr_destroy(&ctx, expr);
4274 err_set_alloc_name:
4275         kfree(set->name);
4276 err_set_name:
4277         kvfree(set);
4278         return err;
4279 }
4280
4281 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4282 {
4283         if (WARN_ON(set->use > 0))
4284                 return;
4285
4286         if (set->expr)
4287                 nft_expr_destroy(ctx, set->expr);
4288
4289         set->ops->destroy(set);
4290         kfree(set->name);
4291         kvfree(set);
4292 }
4293
4294 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4295                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4296                             const struct nlattr * const nla[],
4297                             struct netlink_ext_ack *extack)
4298 {
4299         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4300         u8 genmask = nft_genmask_next(net);
4301         const struct nlattr *attr;
4302         struct nft_set *set;
4303         struct nft_ctx ctx;
4304         int err;
4305
4306         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4307                 return -EAFNOSUPPORT;
4308         if (nla[NFTA_SET_TABLE] == NULL)
4309                 return -EINVAL;
4310
4311         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4312                                         genmask);
4313         if (err < 0)
4314                 return err;
4315
4316         if (nla[NFTA_SET_HANDLE]) {
4317                 attr = nla[NFTA_SET_HANDLE];
4318                 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4319         } else {
4320                 attr = nla[NFTA_SET_NAME];
4321                 set = nft_set_lookup(ctx.table, attr, genmask);
4322         }
4323
4324         if (IS_ERR(set)) {
4325                 NL_SET_BAD_ATTR(extack, attr);
4326                 return PTR_ERR(set);
4327         }
4328         if (set->use ||
4329             (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4330                 NL_SET_BAD_ATTR(extack, attr);
4331                 return -EBUSY;
4332         }
4333
4334         return nft_delset(&ctx, set);
4335 }
4336
4337 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4338                                         struct nft_set *set,
4339                                         const struct nft_set_iter *iter,
4340                                         struct nft_set_elem *elem)
4341 {
4342         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4343         enum nft_registers dreg;
4344
4345         dreg = nft_type_to_reg(set->dtype);
4346         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4347                                            set->dtype == NFT_DATA_VERDICT ?
4348                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4349                                            set->dlen);
4350 }
4351
4352 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4353                        struct nft_set_binding *binding)
4354 {
4355         struct nft_set_binding *i;
4356         struct nft_set_iter iter;
4357
4358         if (set->use == UINT_MAX)
4359                 return -EOVERFLOW;
4360
4361         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4362                 return -EBUSY;
4363
4364         if (binding->flags & NFT_SET_MAP) {
4365                 /* If the set is already bound to the same chain all
4366                  * jumps are already validated for that chain.
4367                  */
4368                 list_for_each_entry(i, &set->bindings, list) {
4369                         if (i->flags & NFT_SET_MAP &&
4370                             i->chain == binding->chain)
4371                                 goto bind;
4372                 }
4373
4374                 iter.genmask    = nft_genmask_next(ctx->net);
4375                 iter.skip       = 0;
4376                 iter.count      = 0;
4377                 iter.err        = 0;
4378                 iter.fn         = nf_tables_bind_check_setelem;
4379
4380                 set->ops->walk(ctx, set, &iter);
4381                 if (iter.err < 0)
4382                         return iter.err;
4383         }
4384 bind:
4385         binding->chain = ctx->chain;
4386         list_add_tail_rcu(&binding->list, &set->bindings);
4387         nft_set_trans_bind(ctx, set);
4388         set->use++;
4389
4390         return 0;
4391 }
4392 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4393
4394 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4395                                  struct nft_set_binding *binding, bool event)
4396 {
4397         list_del_rcu(&binding->list);
4398
4399         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4400                 list_del_rcu(&set->list);
4401                 if (event)
4402                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4403                                              GFP_KERNEL);
4404         }
4405 }
4406
4407 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4408                               struct nft_set_binding *binding,
4409                               enum nft_trans_phase phase)
4410 {
4411         switch (phase) {
4412         case NFT_TRANS_PREPARE:
4413                 set->use--;
4414                 return;
4415         case NFT_TRANS_ABORT:
4416         case NFT_TRANS_RELEASE:
4417                 set->use--;
4418                 fallthrough;
4419         default:
4420                 nf_tables_unbind_set(ctx, set, binding,
4421                                      phase == NFT_TRANS_COMMIT);
4422         }
4423 }
4424 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4425
4426 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4427 {
4428         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4429                 nft_set_destroy(ctx, set);
4430 }
4431 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4432
4433 const struct nft_set_ext_type nft_set_ext_types[] = {
4434         [NFT_SET_EXT_KEY]               = {
4435                 .align  = __alignof__(u32),
4436         },
4437         [NFT_SET_EXT_DATA]              = {
4438                 .align  = __alignof__(u32),
4439         },
4440         [NFT_SET_EXT_EXPR]              = {
4441                 .align  = __alignof__(struct nft_expr),
4442         },
4443         [NFT_SET_EXT_OBJREF]            = {
4444                 .len    = sizeof(struct nft_object *),
4445                 .align  = __alignof__(struct nft_object *),
4446         },
4447         [NFT_SET_EXT_FLAGS]             = {
4448                 .len    = sizeof(u8),
4449                 .align  = __alignof__(u8),
4450         },
4451         [NFT_SET_EXT_TIMEOUT]           = {
4452                 .len    = sizeof(u64),
4453                 .align  = __alignof__(u64),
4454         },
4455         [NFT_SET_EXT_EXPIRATION]        = {
4456                 .len    = sizeof(u64),
4457                 .align  = __alignof__(u64),
4458         },
4459         [NFT_SET_EXT_USERDATA]          = {
4460                 .len    = sizeof(struct nft_userdata),
4461                 .align  = __alignof__(struct nft_userdata),
4462         },
4463         [NFT_SET_EXT_KEY_END]           = {
4464                 .align  = __alignof__(u32),
4465         },
4466 };
4467
4468 /*
4469  * Set elements
4470  */
4471
4472 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4473         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4474         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4475         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4476         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4477         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4478         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4479                                             .len = NFT_USERDATA_MAXLEN },
4480         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4481         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4482                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4483         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4484 };
4485
4486 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4487         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4488                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4489         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4490                                             .len = NFT_SET_MAXNAMELEN - 1 },
4491         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4492         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4493 };
4494
4495 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4496                                       const struct sk_buff *skb,
4497                                       const struct nlmsghdr *nlh,
4498                                       const struct nlattr * const nla[],
4499                                       struct netlink_ext_ack *extack,
4500                                       u8 genmask)
4501 {
4502         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4503         int family = nfmsg->nfgen_family;
4504         struct nft_table *table;
4505
4506         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4507                                  genmask);
4508         if (IS_ERR(table)) {
4509                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4510                 return PTR_ERR(table);
4511         }
4512
4513         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4514         return 0;
4515 }
4516
4517 static int nf_tables_fill_setelem(struct sk_buff *skb,
4518                                   const struct nft_set *set,
4519                                   const struct nft_set_elem *elem)
4520 {
4521         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4522         unsigned char *b = skb_tail_pointer(skb);
4523         struct nlattr *nest;
4524
4525         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4526         if (nest == NULL)
4527                 goto nla_put_failure;
4528
4529         if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4530                           NFT_DATA_VALUE, set->klen) < 0)
4531                 goto nla_put_failure;
4532
4533         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4534             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4535                           NFT_DATA_VALUE, set->klen) < 0)
4536                 goto nla_put_failure;
4537
4538         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4539             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4540                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4541                           set->dlen) < 0)
4542                 goto nla_put_failure;
4543
4544         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
4545             nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
4546                 goto nla_put_failure;
4547
4548         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4549             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4550                            (*nft_set_ext_obj(ext))->key.name) < 0)
4551                 goto nla_put_failure;
4552
4553         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4554             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4555                          htonl(*nft_set_ext_flags(ext))))
4556                 goto nla_put_failure;
4557
4558         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4559             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4560                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4561                          NFTA_SET_ELEM_PAD))
4562                 goto nla_put_failure;
4563
4564         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4565                 u64 expires, now = get_jiffies_64();
4566
4567                 expires = *nft_set_ext_expiration(ext);
4568                 if (time_before64(now, expires))
4569                         expires -= now;
4570                 else
4571                         expires = 0;
4572
4573                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4574                                  nf_jiffies64_to_msecs(expires),
4575                                  NFTA_SET_ELEM_PAD))
4576                         goto nla_put_failure;
4577         }
4578
4579         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4580                 struct nft_userdata *udata;
4581
4582                 udata = nft_set_ext_userdata(ext);
4583                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4584                             udata->len + 1, udata->data))
4585                         goto nla_put_failure;
4586         }
4587
4588         nla_nest_end(skb, nest);
4589         return 0;
4590
4591 nla_put_failure:
4592         nlmsg_trim(skb, b);
4593         return -EMSGSIZE;
4594 }
4595
4596 struct nft_set_dump_args {
4597         const struct netlink_callback   *cb;
4598         struct nft_set_iter             iter;
4599         struct sk_buff                  *skb;
4600 };
4601
4602 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4603                                   struct nft_set *set,
4604                                   const struct nft_set_iter *iter,
4605                                   struct nft_set_elem *elem)
4606 {
4607         struct nft_set_dump_args *args;
4608
4609         args = container_of(iter, struct nft_set_dump_args, iter);
4610         return nf_tables_fill_setelem(args->skb, set, elem);
4611 }
4612
4613 struct nft_set_dump_ctx {
4614         const struct nft_set    *set;
4615         struct nft_ctx          ctx;
4616 };
4617
4618 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4619 {
4620         struct nft_set_dump_ctx *dump_ctx = cb->data;
4621         struct net *net = sock_net(skb->sk);
4622         struct nft_table *table;
4623         struct nft_set *set;
4624         struct nft_set_dump_args args;
4625         bool set_found = false;
4626         struct nfgenmsg *nfmsg;
4627         struct nlmsghdr *nlh;
4628         struct nlattr *nest;
4629         u32 portid, seq;
4630         int event;
4631
4632         rcu_read_lock();
4633         list_for_each_entry_rcu(table, &net->nft.tables, list) {
4634                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4635                     dump_ctx->ctx.family != table->family)
4636                         continue;
4637
4638                 if (table != dump_ctx->ctx.table)
4639                         continue;
4640
4641                 list_for_each_entry_rcu(set, &table->sets, list) {
4642                         if (set == dump_ctx->set) {
4643                                 set_found = true;
4644                                 break;
4645                         }
4646                 }
4647                 break;
4648         }
4649
4650         if (!set_found) {
4651                 rcu_read_unlock();
4652                 return -ENOENT;
4653         }
4654
4655         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4656         portid = NETLINK_CB(cb->skb).portid;
4657         seq    = cb->nlh->nlmsg_seq;
4658
4659         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4660                         NLM_F_MULTI);
4661         if (nlh == NULL)
4662                 goto nla_put_failure;
4663
4664         nfmsg = nlmsg_data(nlh);
4665         nfmsg->nfgen_family = table->family;
4666         nfmsg->version      = NFNETLINK_V0;
4667         nfmsg->res_id       = htons(net->nft.base_seq & 0xffff);
4668
4669         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4670                 goto nla_put_failure;
4671         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4672                 goto nla_put_failure;
4673
4674         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4675         if (nest == NULL)
4676                 goto nla_put_failure;
4677
4678         args.cb                 = cb;
4679         args.skb                = skb;
4680         args.iter.genmask       = nft_genmask_cur(net);
4681         args.iter.skip          = cb->args[0];
4682         args.iter.count         = 0;
4683         args.iter.err           = 0;
4684         args.iter.fn            = nf_tables_dump_setelem;
4685         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4686         rcu_read_unlock();
4687
4688         nla_nest_end(skb, nest);
4689         nlmsg_end(skb, nlh);
4690
4691         if (args.iter.err && args.iter.err != -EMSGSIZE)
4692                 return args.iter.err;
4693         if (args.iter.count == cb->args[0])
4694                 return 0;
4695
4696         cb->args[0] = args.iter.count;
4697         return skb->len;
4698
4699 nla_put_failure:
4700         rcu_read_unlock();
4701         return -ENOSPC;
4702 }
4703
4704 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4705 {
4706         struct nft_set_dump_ctx *dump_ctx = cb->data;
4707
4708         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4709
4710         return cb->data ? 0 : -ENOMEM;
4711 }
4712
4713 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4714 {
4715         kfree(cb->data);
4716         return 0;
4717 }
4718
4719 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4720                                        const struct nft_ctx *ctx, u32 seq,
4721                                        u32 portid, int event, u16 flags,
4722                                        const struct nft_set *set,
4723                                        const struct nft_set_elem *elem)
4724 {
4725         struct nfgenmsg *nfmsg;
4726         struct nlmsghdr *nlh;
4727         struct nlattr *nest;
4728         int err;
4729
4730         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4731         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4732                         flags);
4733         if (nlh == NULL)
4734                 goto nla_put_failure;
4735
4736         nfmsg = nlmsg_data(nlh);
4737         nfmsg->nfgen_family     = ctx->family;
4738         nfmsg->version          = NFNETLINK_V0;
4739         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
4740
4741         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4742                 goto nla_put_failure;
4743         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4744                 goto nla_put_failure;
4745
4746         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4747         if (nest == NULL)
4748                 goto nla_put_failure;
4749
4750         err = nf_tables_fill_setelem(skb, set, elem);
4751         if (err < 0)
4752                 goto nla_put_failure;
4753
4754         nla_nest_end(skb, nest);
4755
4756         nlmsg_end(skb, nlh);
4757         return 0;
4758
4759 nla_put_failure:
4760         nlmsg_trim(skb, nlh);
4761         return -1;
4762 }
4763
4764 static int nft_setelem_parse_flags(const struct nft_set *set,
4765                                    const struct nlattr *attr, u32 *flags)
4766 {
4767         if (attr == NULL)
4768                 return 0;
4769
4770         *flags = ntohl(nla_get_be32(attr));
4771         if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4772                 return -EINVAL;
4773         if (!(set->flags & NFT_SET_INTERVAL) &&
4774             *flags & NFT_SET_ELEM_INTERVAL_END)
4775                 return -EINVAL;
4776
4777         return 0;
4778 }
4779
4780 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4781                                  struct nft_data *key, struct nlattr *attr)
4782 {
4783         struct nft_data_desc desc;
4784         int err;
4785
4786         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4787         if (err < 0)
4788                 return err;
4789
4790         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4791                 nft_data_release(key, desc.type);
4792                 return -EINVAL;
4793         }
4794
4795         return 0;
4796 }
4797
4798 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4799                                   struct nft_data_desc *desc,
4800                                   struct nft_data *data,
4801                                   struct nlattr *attr)
4802 {
4803         int err;
4804
4805         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4806         if (err < 0)
4807                 return err;
4808
4809         if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4810                 nft_data_release(data, desc->type);
4811                 return -EINVAL;
4812         }
4813
4814         return 0;
4815 }
4816
4817 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4818                             const struct nlattr *attr)
4819 {
4820         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4821         struct nft_set_elem elem;
4822         struct sk_buff *skb;
4823         uint32_t flags = 0;
4824         void *priv;
4825         int err;
4826
4827         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4828                                           nft_set_elem_policy, NULL);
4829         if (err < 0)
4830                 return err;
4831
4832         if (!nla[NFTA_SET_ELEM_KEY])
4833                 return -EINVAL;
4834
4835         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4836         if (err < 0)
4837                 return err;
4838
4839         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4840                                     nla[NFTA_SET_ELEM_KEY]);
4841         if (err < 0)
4842                 return err;
4843
4844         if (nla[NFTA_SET_ELEM_KEY_END]) {
4845                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4846                                             nla[NFTA_SET_ELEM_KEY_END]);
4847                 if (err < 0)
4848                         return err;
4849         }
4850
4851         priv = set->ops->get(ctx->net, set, &elem, flags);
4852         if (IS_ERR(priv))
4853                 return PTR_ERR(priv);
4854
4855         elem.priv = priv;
4856
4857         err = -ENOMEM;
4858         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4859         if (skb == NULL)
4860                 goto err1;
4861
4862         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4863                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
4864         if (err < 0)
4865                 goto err2;
4866
4867         err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4868         /* This avoids a loop in nfnetlink. */
4869         if (err < 0)
4870                 goto err1;
4871
4872         return 0;
4873 err2:
4874         kfree_skb(skb);
4875 err1:
4876         /* this avoids a loop in nfnetlink. */
4877         return err == -EAGAIN ? -ENOBUFS : err;
4878 }
4879
4880 /* called with rcu_read_lock held */
4881 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4882                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
4883                                 const struct nlattr * const nla[],
4884                                 struct netlink_ext_ack *extack)
4885 {
4886         u8 genmask = nft_genmask_cur(net);
4887         struct nft_set *set;
4888         struct nlattr *attr;
4889         struct nft_ctx ctx;
4890         int rem, err = 0;
4891
4892         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4893                                          genmask);
4894         if (err < 0)
4895                 return err;
4896
4897         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4898         if (IS_ERR(set))
4899                 return PTR_ERR(set);
4900
4901         if (nlh->nlmsg_flags & NLM_F_DUMP) {
4902                 struct netlink_dump_control c = {
4903                         .start = nf_tables_dump_set_start,
4904                         .dump = nf_tables_dump_set,
4905                         .done = nf_tables_dump_set_done,
4906                         .module = THIS_MODULE,
4907                 };
4908                 struct nft_set_dump_ctx dump_ctx = {
4909                         .set = set,
4910                         .ctx = ctx,
4911                 };
4912
4913                 c.data = &dump_ctx;
4914                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4915         }
4916
4917         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4918                 return -EINVAL;
4919
4920         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4921                 err = nft_get_set_elem(&ctx, set, attr);
4922                 if (err < 0)
4923                         break;
4924         }
4925
4926         return err;
4927 }
4928
4929 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4930                                      const struct nft_set *set,
4931                                      const struct nft_set_elem *elem,
4932                                      int event, u16 flags)
4933 {
4934         struct net *net = ctx->net;
4935         u32 portid = ctx->portid;
4936         struct sk_buff *skb;
4937         int err;
4938         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
4939                               ctx->table->name, ctx->table->handle,
4940                               set->name, set->handle);
4941
4942         audit_log_nfcfg(buf,
4943                         ctx->family,
4944                         set->handle,
4945                         event == NFT_MSG_NEWSETELEM ?
4946                                 AUDIT_NFT_OP_SETELEM_REGISTER :
4947                                 AUDIT_NFT_OP_SETELEM_UNREGISTER,
4948                         GFP_KERNEL);
4949         kfree(buf);
4950
4951         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4952                 return;
4953
4954         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4955         if (skb == NULL)
4956                 goto err;
4957
4958         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4959                                           set, elem);
4960         if (err < 0) {
4961                 kfree_skb(skb);
4962                 goto err;
4963         }
4964
4965         nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4966                        GFP_KERNEL);
4967         return;
4968 err:
4969         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4970 }
4971
4972 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4973                                               int msg_type,
4974                                               struct nft_set *set)
4975 {
4976         struct nft_trans *trans;
4977
4978         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4979         if (trans == NULL)
4980                 return NULL;
4981
4982         nft_trans_elem_set(trans) = set;
4983         return trans;
4984 }
4985
4986 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
4987                                          const struct nft_set *set,
4988                                          const struct nlattr *attr)
4989 {
4990         struct nft_expr *expr;
4991         int err;
4992
4993         expr = nft_expr_init(ctx, attr);
4994         if (IS_ERR(expr))
4995                 return expr;
4996
4997         err = -EOPNOTSUPP;
4998         if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
4999                 goto err_set_elem_expr;
5000
5001         if (expr->ops->type->flags & NFT_EXPR_GC) {
5002                 if (set->flags & NFT_SET_TIMEOUT)
5003                         goto err_set_elem_expr;
5004                 if (!set->ops->gc_init)
5005                         goto err_set_elem_expr;
5006                 set->ops->gc_init(set);
5007         }
5008
5009         return expr;
5010
5011 err_set_elem_expr:
5012         nft_expr_destroy(ctx, expr);
5013         return ERR_PTR(err);
5014 }
5015
5016 void *nft_set_elem_init(const struct nft_set *set,
5017                         const struct nft_set_ext_tmpl *tmpl,
5018                         const u32 *key, const u32 *key_end,
5019                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5020 {
5021         struct nft_set_ext *ext;
5022         void *elem;
5023
5024         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5025         if (elem == NULL)
5026                 return NULL;
5027
5028         ext = nft_set_elem_ext(set, elem);
5029         nft_set_ext_init(ext, tmpl);
5030
5031         memcpy(nft_set_ext_key(ext), key, set->klen);
5032         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5033                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5034         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5035                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5036         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5037                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5038                 if (expiration == 0)
5039                         *nft_set_ext_expiration(ext) += timeout;
5040         }
5041         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5042                 *nft_set_ext_timeout(ext) = timeout;
5043
5044         return elem;
5045 }
5046
5047 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5048                                       struct nft_expr *expr)
5049 {
5050         if (expr->ops->destroy_clone) {
5051                 expr->ops->destroy_clone(ctx, expr);
5052                 module_put(expr->ops->type->owner);
5053         } else {
5054                 nf_tables_expr_destroy(ctx, expr);
5055         }
5056 }
5057
5058 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5059                           bool destroy_expr)
5060 {
5061         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5062         struct nft_ctx ctx = {
5063                 .net    = read_pnet(&set->net),
5064                 .family = set->table->family,
5065         };
5066
5067         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5068         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5069                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5070         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5071                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5072
5073         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5074                 (*nft_set_ext_obj(ext))->use--;
5075         kfree(elem);
5076 }
5077 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5078
5079 /* Only called from commit path, nft_set_elem_deactivate() already deals with
5080  * the refcounting from the preparation phase.
5081  */
5082 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5083                                        const struct nft_set *set, void *elem)
5084 {
5085         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5086
5087         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5088                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5089
5090         kfree(elem);
5091 }
5092
5093 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5094                             const struct nlattr *attr, u32 nlmsg_flags)
5095 {
5096         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5097         u8 genmask = nft_genmask_next(ctx->net);
5098         struct nft_set_ext_tmpl tmpl;
5099         struct nft_set_ext *ext, *ext2;
5100         struct nft_set_elem elem;
5101         struct nft_set_binding *binding;
5102         struct nft_object *obj = NULL;
5103         struct nft_expr *expr = NULL;
5104         struct nft_userdata *udata;
5105         struct nft_data_desc desc;
5106         enum nft_registers dreg;
5107         struct nft_trans *trans;
5108         u32 flags = 0;
5109         u64 timeout;
5110         u64 expiration;
5111         u8 ulen;
5112         int err;
5113
5114         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5115                                           nft_set_elem_policy, NULL);
5116         if (err < 0)
5117                 return err;
5118
5119         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5120                 return -EINVAL;
5121
5122         nft_set_ext_prepare(&tmpl);
5123
5124         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5125         if (err < 0)
5126                 return err;
5127         if (flags != 0)
5128                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5129
5130         if (set->flags & NFT_SET_MAP) {
5131                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5132                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5133                         return -EINVAL;
5134         } else {
5135                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5136                         return -EINVAL;
5137         }
5138
5139         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5140              (nla[NFTA_SET_ELEM_DATA] ||
5141               nla[NFTA_SET_ELEM_OBJREF] ||
5142               nla[NFTA_SET_ELEM_TIMEOUT] ||
5143               nla[NFTA_SET_ELEM_EXPIRATION] ||
5144               nla[NFTA_SET_ELEM_USERDATA] ||
5145               nla[NFTA_SET_ELEM_EXPR]))
5146                 return -EINVAL;
5147
5148         timeout = 0;
5149         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5150                 if (!(set->flags & NFT_SET_TIMEOUT))
5151                         return -EINVAL;
5152                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5153                                             &timeout);
5154                 if (err)
5155                         return err;
5156         } else if (set->flags & NFT_SET_TIMEOUT) {
5157                 timeout = set->timeout;
5158         }
5159
5160         expiration = 0;
5161         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5162                 if (!(set->flags & NFT_SET_TIMEOUT))
5163                         return -EINVAL;
5164                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5165                                             &expiration);
5166                 if (err)
5167                         return err;
5168         }
5169
5170         if (nla[NFTA_SET_ELEM_EXPR] != NULL) {
5171                 expr = nft_set_elem_expr_alloc(ctx, set,
5172                                                nla[NFTA_SET_ELEM_EXPR]);
5173                 if (IS_ERR(expr))
5174                         return PTR_ERR(expr);
5175
5176                 err = -EOPNOTSUPP;
5177                 if (set->expr && set->expr->ops != expr->ops)
5178                         goto err_set_elem_expr;
5179         } else if (set->expr) {
5180                 expr = kzalloc(set->expr->ops->size, GFP_KERNEL);
5181                 if (!expr)
5182                         return -ENOMEM;
5183
5184                 err = nft_expr_clone(expr, set->expr);
5185                 if (err < 0)
5186                         goto err_set_elem_expr;
5187         }
5188
5189         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5190                                     nla[NFTA_SET_ELEM_KEY]);
5191         if (err < 0)
5192                 goto err_set_elem_expr;
5193
5194         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5195
5196         if (nla[NFTA_SET_ELEM_KEY_END]) {
5197                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5198                                             nla[NFTA_SET_ELEM_KEY_END]);
5199                 if (err < 0)
5200                         goto err_parse_key;
5201
5202                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5203         }
5204
5205         if (timeout > 0) {
5206                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5207                 if (timeout != set->timeout)
5208                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5209         }
5210
5211         if (expr)
5212                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPR,
5213                                        expr->ops->size);
5214
5215         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5216                 if (!(set->flags & NFT_SET_OBJECT)) {
5217                         err = -EINVAL;
5218                         goto err_parse_key_end;
5219                 }
5220                 obj = nft_obj_lookup(ctx->net, ctx->table,
5221                                      nla[NFTA_SET_ELEM_OBJREF],
5222                                      set->objtype, genmask);
5223                 if (IS_ERR(obj)) {
5224                         err = PTR_ERR(obj);
5225                         goto err_parse_key_end;
5226                 }
5227                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5228         }
5229
5230         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5231                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5232                                              nla[NFTA_SET_ELEM_DATA]);
5233                 if (err < 0)
5234                         goto err_parse_key_end;
5235
5236                 dreg = nft_type_to_reg(set->dtype);
5237                 list_for_each_entry(binding, &set->bindings, list) {
5238                         struct nft_ctx bind_ctx = {
5239                                 .net    = ctx->net,
5240                                 .family = ctx->family,
5241                                 .table  = ctx->table,
5242                                 .chain  = (struct nft_chain *)binding->chain,
5243                         };
5244
5245                         if (!(binding->flags & NFT_SET_MAP))
5246                                 continue;
5247
5248                         err = nft_validate_register_store(&bind_ctx, dreg,
5249                                                           &elem.data.val,
5250                                                           desc.type, desc.len);
5251                         if (err < 0)
5252                                 goto err_parse_data;
5253
5254                         if (desc.type == NFT_DATA_VERDICT &&
5255                             (elem.data.val.verdict.code == NFT_GOTO ||
5256                              elem.data.val.verdict.code == NFT_JUMP))
5257                                 nft_validate_state_update(ctx->net,
5258                                                           NFT_VALIDATE_NEED);
5259                 }
5260
5261                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5262         }
5263
5264         /* The full maximum length of userdata can exceed the maximum
5265          * offset value (U8_MAX) for following extensions, therefor it
5266          * must be the last extension added.
5267          */
5268         ulen = 0;
5269         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5270                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5271                 if (ulen > 0)
5272                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5273                                                ulen);
5274         }
5275
5276         err = -ENOMEM;
5277         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5278                                       elem.key_end.val.data, elem.data.val.data,
5279                                       timeout, expiration, GFP_KERNEL);
5280         if (elem.priv == NULL)
5281                 goto err_parse_data;
5282
5283         ext = nft_set_elem_ext(set, elem.priv);
5284         if (flags)
5285                 *nft_set_ext_flags(ext) = flags;
5286         if (ulen > 0) {
5287                 udata = nft_set_ext_userdata(ext);
5288                 udata->len = ulen - 1;
5289                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5290         }
5291         if (obj) {
5292                 *nft_set_ext_obj(ext) = obj;
5293                 obj->use++;
5294         }
5295         if (expr) {
5296                 memcpy(nft_set_ext_expr(ext), expr, expr->ops->size);
5297                 kfree(expr);
5298                 expr = NULL;
5299         }
5300
5301         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5302         if (trans == NULL)
5303                 goto err_trans;
5304
5305         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5306         err = set->ops->insert(ctx->net, set, &elem, &ext2);
5307         if (err) {
5308                 if (err == -EEXIST) {
5309                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5310                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5311                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5312                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5313                                 goto err_element_clash;
5314                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5315                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5316                              memcmp(nft_set_ext_data(ext),
5317                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
5318                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5319                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5320                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5321                                 goto err_element_clash;
5322                         else if (!(nlmsg_flags & NLM_F_EXCL))
5323                                 err = 0;
5324                 } else if (err == -ENOTEMPTY) {
5325                         /* ENOTEMPTY reports overlapping between this element
5326                          * and an existing one.
5327                          */
5328                         err = -EEXIST;
5329                 }
5330                 goto err_element_clash;
5331         }
5332
5333         if (set->size &&
5334             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5335                 err = -ENFILE;
5336                 goto err_set_full;
5337         }
5338
5339         nft_trans_elem(trans) = elem;
5340         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5341         return 0;
5342
5343 err_set_full:
5344         set->ops->remove(ctx->net, set, &elem);
5345 err_element_clash:
5346         kfree(trans);
5347 err_trans:
5348         if (obj)
5349                 obj->use--;
5350
5351         nf_tables_set_elem_destroy(ctx, set, elem.priv);
5352 err_parse_data:
5353         if (nla[NFTA_SET_ELEM_DATA] != NULL)
5354                 nft_data_release(&elem.data.val, desc.type);
5355 err_parse_key_end:
5356         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5357 err_parse_key:
5358         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5359 err_set_elem_expr:
5360         if (expr != NULL)
5361                 nft_expr_destroy(ctx, expr);
5362
5363         return err;
5364 }
5365
5366 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5367                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5368                                 const struct nlattr * const nla[],
5369                                 struct netlink_ext_ack *extack)
5370 {
5371         u8 genmask = nft_genmask_next(net);
5372         const struct nlattr *attr;
5373         struct nft_set *set;
5374         struct nft_ctx ctx;
5375         int rem, err;
5376
5377         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5378                 return -EINVAL;
5379
5380         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5381                                          genmask);
5382         if (err < 0)
5383                 return err;
5384
5385         set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5386                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5387         if (IS_ERR(set))
5388                 return PTR_ERR(set);
5389
5390         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5391                 return -EBUSY;
5392
5393         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5394                 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5395                 if (err < 0)
5396                         return err;
5397         }
5398
5399         if (net->nft.validate_state == NFT_VALIDATE_DO)
5400                 return nft_table_validate(net, ctx.table);
5401
5402         return 0;
5403 }
5404
5405 /**
5406  *      nft_data_hold - hold a nft_data item
5407  *
5408  *      @data: struct nft_data to release
5409  *      @type: type of data
5410  *
5411  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5412  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5413  *      NFT_GOTO verdicts. This function must be called on active data objects
5414  *      from the second phase of the commit protocol.
5415  */
5416 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5417 {
5418         struct nft_chain *chain;
5419         struct nft_rule *rule;
5420
5421         if (type == NFT_DATA_VERDICT) {
5422                 switch (data->verdict.code) {
5423                 case NFT_JUMP:
5424                 case NFT_GOTO:
5425                         chain = data->verdict.chain;
5426                         chain->use++;
5427
5428                         if (!nft_chain_is_bound(chain))
5429                                 break;
5430
5431                         chain->table->use++;
5432                         list_for_each_entry(rule, &chain->rules, list)
5433                                 chain->use++;
5434
5435                         nft_chain_add(chain->table, chain);
5436                         break;
5437                 }
5438         }
5439 }
5440
5441 static void nft_set_elem_activate(const struct net *net,
5442                                   const struct nft_set *set,
5443                                   struct nft_set_elem *elem)
5444 {
5445         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5446
5447         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5448                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5449         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5450                 (*nft_set_ext_obj(ext))->use++;
5451 }
5452
5453 static void nft_set_elem_deactivate(const struct net *net,
5454                                     const struct nft_set *set,
5455                                     struct nft_set_elem *elem)
5456 {
5457         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5458
5459         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5460                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5461         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5462                 (*nft_set_ext_obj(ext))->use--;
5463 }
5464
5465 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5466                            const struct nlattr *attr)
5467 {
5468         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5469         struct nft_set_ext_tmpl tmpl;
5470         struct nft_set_elem elem;
5471         struct nft_set_ext *ext;
5472         struct nft_trans *trans;
5473         u32 flags = 0;
5474         void *priv;
5475         int err;
5476
5477         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5478                                           nft_set_elem_policy, NULL);
5479         if (err < 0)
5480                 return err;
5481
5482         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5483                 return -EINVAL;
5484
5485         nft_set_ext_prepare(&tmpl);
5486
5487         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5488         if (err < 0)
5489                 return err;
5490         if (flags != 0)
5491                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5492
5493         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5494                                     nla[NFTA_SET_ELEM_KEY]);
5495         if (err < 0)
5496                 return err;
5497
5498         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5499
5500         if (nla[NFTA_SET_ELEM_KEY_END]) {
5501                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5502                                             nla[NFTA_SET_ELEM_KEY_END]);
5503                 if (err < 0)
5504                         return err;
5505
5506                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5507         }
5508
5509         err = -ENOMEM;
5510         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5511                                       elem.key_end.val.data, NULL, 0, 0,
5512                                       GFP_KERNEL);
5513         if (elem.priv == NULL)
5514                 goto fail_elem;
5515
5516         ext = nft_set_elem_ext(set, elem.priv);
5517         if (flags)
5518                 *nft_set_ext_flags(ext) = flags;
5519
5520         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5521         if (trans == NULL)
5522                 goto fail_trans;
5523
5524         priv = set->ops->deactivate(ctx->net, set, &elem);
5525         if (priv == NULL) {
5526                 err = -ENOENT;
5527                 goto fail_ops;
5528         }
5529         kfree(elem.priv);
5530         elem.priv = priv;
5531
5532         nft_set_elem_deactivate(ctx->net, set, &elem);
5533
5534         nft_trans_elem(trans) = elem;
5535         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5536         return 0;
5537
5538 fail_ops:
5539         kfree(trans);
5540 fail_trans:
5541         kfree(elem.priv);
5542 fail_elem:
5543         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5544         return err;
5545 }
5546
5547 static int nft_flush_set(const struct nft_ctx *ctx,
5548                          struct nft_set *set,
5549                          const struct nft_set_iter *iter,
5550                          struct nft_set_elem *elem)
5551 {
5552         struct nft_trans *trans;
5553         int err;
5554
5555         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5556                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
5557         if (!trans)
5558                 return -ENOMEM;
5559
5560         if (!set->ops->flush(ctx->net, set, elem->priv)) {
5561                 err = -ENOENT;
5562                 goto err1;
5563         }
5564         set->ndeact++;
5565
5566         nft_set_elem_deactivate(ctx->net, set, elem);
5567         nft_trans_elem_set(trans) = set;
5568         nft_trans_elem(trans) = *elem;
5569         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5570
5571         return 0;
5572 err1:
5573         kfree(trans);
5574         return err;
5575 }
5576
5577 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5578                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5579                                 const struct nlattr * const nla[],
5580                                 struct netlink_ext_ack *extack)
5581 {
5582         u8 genmask = nft_genmask_next(net);
5583         const struct nlattr *attr;
5584         struct nft_set *set;
5585         struct nft_ctx ctx;
5586         int rem, err = 0;
5587
5588         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5589                                          genmask);
5590         if (err < 0)
5591                 return err;
5592
5593         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5594         if (IS_ERR(set))
5595                 return PTR_ERR(set);
5596         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5597                 return -EBUSY;
5598
5599         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5600                 struct nft_set_iter iter = {
5601                         .genmask        = genmask,
5602                         .fn             = nft_flush_set,
5603                 };
5604                 set->ops->walk(&ctx, set, &iter);
5605
5606                 return iter.err;
5607         }
5608
5609         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5610                 err = nft_del_setelem(&ctx, set, attr);
5611                 if (err < 0)
5612                         break;
5613
5614                 set->ndeact++;
5615         }
5616         return err;
5617 }
5618
5619 void nft_set_gc_batch_release(struct rcu_head *rcu)
5620 {
5621         struct nft_set_gc_batch *gcb;
5622         unsigned int i;
5623
5624         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5625         for (i = 0; i < gcb->head.cnt; i++)
5626                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5627         kfree(gcb);
5628 }
5629
5630 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5631                                                 gfp_t gfp)
5632 {
5633         struct nft_set_gc_batch *gcb;
5634
5635         gcb = kzalloc(sizeof(*gcb), gfp);
5636         if (gcb == NULL)
5637                 return gcb;
5638         gcb->head.set = set;
5639         return gcb;
5640 }
5641
5642 /*
5643  * Stateful objects
5644  */
5645
5646 /**
5647  *      nft_register_obj- register nf_tables stateful object type
5648  *      @obj_type: object type
5649  *
5650  *      Registers the object type for use with nf_tables. Returns zero on
5651  *      success or a negative errno code otherwise.
5652  */
5653 int nft_register_obj(struct nft_object_type *obj_type)
5654 {
5655         if (obj_type->type == NFT_OBJECT_UNSPEC)
5656                 return -EINVAL;
5657
5658         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5659         list_add_rcu(&obj_type->list, &nf_tables_objects);
5660         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5661         return 0;
5662 }
5663 EXPORT_SYMBOL_GPL(nft_register_obj);
5664
5665 /**
5666  *      nft_unregister_obj - unregister nf_tables object type
5667  *      @obj_type: object type
5668  *
5669  *      Unregisters the object type for use with nf_tables.
5670  */
5671 void nft_unregister_obj(struct nft_object_type *obj_type)
5672 {
5673         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5674         list_del_rcu(&obj_type->list);
5675         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5676 }
5677 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5678
5679 struct nft_object *nft_obj_lookup(const struct net *net,
5680                                   const struct nft_table *table,
5681                                   const struct nlattr *nla, u32 objtype,
5682                                   u8 genmask)
5683 {
5684         struct nft_object_hash_key k = { .table = table };
5685         char search[NFT_OBJ_MAXNAMELEN];
5686         struct rhlist_head *tmp, *list;
5687         struct nft_object *obj;
5688
5689         nla_strlcpy(search, nla, sizeof(search));
5690         k.name = search;
5691
5692         WARN_ON_ONCE(!rcu_read_lock_held() &&
5693                      !lockdep_commit_lock_is_held(net));
5694
5695         rcu_read_lock();
5696         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5697         if (!list)
5698                 goto out;
5699
5700         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5701                 if (objtype == obj->ops->type->type &&
5702                     nft_active_genmask(obj, genmask)) {
5703                         rcu_read_unlock();
5704                         return obj;
5705                 }
5706         }
5707 out:
5708         rcu_read_unlock();
5709         return ERR_PTR(-ENOENT);
5710 }
5711 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5712
5713 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5714                                                   const struct nlattr *nla,
5715                                                   u32 objtype, u8 genmask)
5716 {
5717         struct nft_object *obj;
5718
5719         list_for_each_entry(obj, &table->objects, list) {
5720                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5721                     objtype == obj->ops->type->type &&
5722                     nft_active_genmask(obj, genmask))
5723                         return obj;
5724         }
5725         return ERR_PTR(-ENOENT);
5726 }
5727
5728 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5729         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
5730                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
5731         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
5732                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
5733         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
5734         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
5735         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
5736 };
5737
5738 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5739                                        const struct nft_object_type *type,
5740                                        const struct nlattr *attr)
5741 {
5742         struct nlattr **tb;
5743         const struct nft_object_ops *ops;
5744         struct nft_object *obj;
5745         int err = -ENOMEM;
5746
5747         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5748         if (!tb)
5749                 goto err1;
5750
5751         if (attr) {
5752                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5753                                                   type->policy, NULL);
5754                 if (err < 0)
5755                         goto err2;
5756         } else {
5757                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5758         }
5759
5760         if (type->select_ops) {
5761                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5762                 if (IS_ERR(ops)) {
5763                         err = PTR_ERR(ops);
5764                         goto err2;
5765                 }
5766         } else {
5767                 ops = type->ops;
5768         }
5769
5770         err = -ENOMEM;
5771         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5772         if (!obj)
5773                 goto err2;
5774
5775         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5776         if (err < 0)
5777                 goto err3;
5778
5779         obj->ops = ops;
5780
5781         kfree(tb);
5782         return obj;
5783 err3:
5784         kfree(obj);
5785 err2:
5786         kfree(tb);
5787 err1:
5788         return ERR_PTR(err);
5789 }
5790
5791 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5792                            struct nft_object *obj, bool reset)
5793 {
5794         struct nlattr *nest;
5795
5796         nest = nla_nest_start_noflag(skb, attr);
5797         if (!nest)
5798                 goto nla_put_failure;
5799         if (obj->ops->dump(skb, obj, reset) < 0)
5800                 goto nla_put_failure;
5801         nla_nest_end(skb, nest);
5802         return 0;
5803
5804 nla_put_failure:
5805         return -1;
5806 }
5807
5808 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5809 {
5810         const struct nft_object_type *type;
5811
5812         list_for_each_entry(type, &nf_tables_objects, list) {
5813                 if (objtype == type->type)
5814                         return type;
5815         }
5816         return NULL;
5817 }
5818
5819 static const struct nft_object_type *
5820 nft_obj_type_get(struct net *net, u32 objtype)
5821 {
5822         const struct nft_object_type *type;
5823
5824         type = __nft_obj_type_get(objtype);
5825         if (type != NULL && try_module_get(type->owner))
5826                 return type;
5827
5828         lockdep_nfnl_nft_mutex_not_held();
5829 #ifdef CONFIG_MODULES
5830         if (type == NULL) {
5831                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
5832                         return ERR_PTR(-EAGAIN);
5833         }
5834 #endif
5835         return ERR_PTR(-ENOENT);
5836 }
5837
5838 static int nf_tables_updobj(const struct nft_ctx *ctx,
5839                             const struct nft_object_type *type,
5840                             const struct nlattr *attr,
5841                             struct nft_object *obj)
5842 {
5843         struct nft_object *newobj;
5844         struct nft_trans *trans;
5845         int err;
5846
5847         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
5848                                 sizeof(struct nft_trans_obj));
5849         if (!trans)
5850                 return -ENOMEM;
5851
5852         newobj = nft_obj_init(ctx, type, attr);
5853         if (IS_ERR(newobj)) {
5854                 err = PTR_ERR(newobj);
5855                 goto err_free_trans;
5856         }
5857
5858         nft_trans_obj(trans) = obj;
5859         nft_trans_obj_update(trans) = true;
5860         nft_trans_obj_newobj(trans) = newobj;
5861         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5862
5863         return 0;
5864
5865 err_free_trans:
5866         kfree(trans);
5867         return err;
5868 }
5869
5870 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5871                             struct sk_buff *skb, const struct nlmsghdr *nlh,
5872                             const struct nlattr * const nla[],
5873                             struct netlink_ext_ack *extack)
5874 {
5875         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5876         const struct nft_object_type *type;
5877         u8 genmask = nft_genmask_next(net);
5878         int family = nfmsg->nfgen_family;
5879         struct nft_table *table;
5880         struct nft_object *obj;
5881         struct nft_ctx ctx;
5882         u32 objtype;
5883         int err;
5884
5885         if (!nla[NFTA_OBJ_TYPE] ||
5886             !nla[NFTA_OBJ_NAME] ||
5887             !nla[NFTA_OBJ_DATA])
5888                 return -EINVAL;
5889
5890         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5891         if (IS_ERR(table)) {
5892                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5893                 return PTR_ERR(table);
5894         }
5895
5896         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5897         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5898         if (IS_ERR(obj)) {
5899                 err = PTR_ERR(obj);
5900                 if (err != -ENOENT) {
5901                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5902                         return err;
5903                 }
5904         } else {
5905                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5906                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5907                         return -EEXIST;
5908                 }
5909                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
5910                         return -EOPNOTSUPP;
5911
5912                 type = __nft_obj_type_get(objtype);
5913                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5914
5915                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
5916         }
5917
5918         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5919
5920         type = nft_obj_type_get(net, objtype);
5921         if (IS_ERR(type))
5922                 return PTR_ERR(type);
5923
5924         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5925         if (IS_ERR(obj)) {
5926                 err = PTR_ERR(obj);
5927                 goto err1;
5928         }
5929         obj->key.table = table;
5930         obj->handle = nf_tables_alloc_handle(table);
5931
5932         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5933         if (!obj->key.name) {
5934                 err = -ENOMEM;
5935                 goto err2;
5936         }
5937
5938         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5939         if (err < 0)
5940                 goto err3;
5941
5942         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
5943                               nft_objname_ht_params);
5944         if (err < 0)
5945                 goto err4;
5946
5947         list_add_tail_rcu(&obj->list, &table->objects);
5948         table->use++;
5949         return 0;
5950 err4:
5951         /* queued in transaction log */
5952         INIT_LIST_HEAD(&obj->list);
5953         return err;
5954 err3:
5955         kfree(obj->key.name);
5956 err2:
5957         if (obj->ops->destroy)
5958                 obj->ops->destroy(&ctx, obj);
5959         kfree(obj);
5960 err1:
5961         module_put(type->owner);
5962         return err;
5963 }
5964
5965 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5966                                    u32 portid, u32 seq, int event, u32 flags,
5967                                    int family, const struct nft_table *table,
5968                                    struct nft_object *obj, bool reset)
5969 {
5970         struct nfgenmsg *nfmsg;
5971         struct nlmsghdr *nlh;
5972
5973         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5974         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5975         if (nlh == NULL)
5976                 goto nla_put_failure;
5977
5978         nfmsg = nlmsg_data(nlh);
5979         nfmsg->nfgen_family     = family;
5980         nfmsg->version          = NFNETLINK_V0;
5981         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
5982
5983         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5984             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
5985             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5986             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5987             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5988             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5989                          NFTA_OBJ_PAD))
5990                 goto nla_put_failure;
5991
5992         nlmsg_end(skb, nlh);
5993         return 0;
5994
5995 nla_put_failure:
5996         nlmsg_trim(skb, nlh);
5997         return -1;
5998 }
5999
6000 struct nft_obj_filter {
6001         char            *table;
6002         u32             type;
6003 };
6004
6005 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6006 {
6007         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6008         const struct nft_table *table;
6009         unsigned int idx = 0, s_idx = cb->args[0];
6010         struct nft_obj_filter *filter = cb->data;
6011         struct net *net = sock_net(skb->sk);
6012         int family = nfmsg->nfgen_family;
6013         struct nft_object *obj;
6014         bool reset = false;
6015
6016         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6017                 reset = true;
6018
6019         rcu_read_lock();
6020         cb->seq = net->nft.base_seq;
6021
6022         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6023                 if (family != NFPROTO_UNSPEC && family != table->family)
6024                         continue;
6025
6026                 list_for_each_entry_rcu(obj, &table->objects, list) {
6027                         if (!nft_is_active(net, obj))
6028                                 goto cont;
6029                         if (idx < s_idx)
6030                                 goto cont;
6031                         if (idx > s_idx)
6032                                 memset(&cb->args[1], 0,
6033                                        sizeof(cb->args) - sizeof(cb->args[0]));
6034                         if (filter && filter->table &&
6035                             strcmp(filter->table, table->name))
6036                                 goto cont;
6037                         if (filter &&
6038                             filter->type != NFT_OBJECT_UNSPEC &&
6039                             obj->ops->type->type != filter->type)
6040                                 goto cont;
6041
6042                         if (reset) {
6043                                 char *buf = kasprintf(GFP_ATOMIC,
6044                                                       "%s:%llu;?:0",
6045                                                       table->name,
6046                                                       table->handle);
6047
6048                                 audit_log_nfcfg(buf,
6049                                                 family,
6050                                                 obj->handle,
6051                                                 AUDIT_NFT_OP_OBJ_RESET,
6052                                                 GFP_ATOMIC);
6053                                 kfree(buf);
6054                         }
6055
6056                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6057                                                     cb->nlh->nlmsg_seq,
6058                                                     NFT_MSG_NEWOBJ,
6059                                                     NLM_F_MULTI | NLM_F_APPEND,
6060                                                     table->family, table,
6061                                                     obj, reset) < 0)
6062                                 goto done;
6063
6064                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6065 cont:
6066                         idx++;
6067                 }
6068         }
6069 done:
6070         rcu_read_unlock();
6071
6072         cb->args[0] = idx;
6073         return skb->len;
6074 }
6075
6076 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6077 {
6078         const struct nlattr * const *nla = cb->data;
6079         struct nft_obj_filter *filter = NULL;
6080
6081         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6082                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6083                 if (!filter)
6084                         return -ENOMEM;
6085
6086                 if (nla[NFTA_OBJ_TABLE]) {
6087                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6088                         if (!filter->table) {
6089                                 kfree(filter);
6090                                 return -ENOMEM;
6091                         }
6092                 }
6093
6094                 if (nla[NFTA_OBJ_TYPE])
6095                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6096         }
6097
6098         cb->data = filter;
6099         return 0;
6100 }
6101
6102 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6103 {
6104         struct nft_obj_filter *filter = cb->data;
6105
6106         if (filter) {
6107                 kfree(filter->table);
6108                 kfree(filter);
6109         }
6110
6111         return 0;
6112 }
6113
6114 /* called with rcu_read_lock held */
6115 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6116                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6117                             const struct nlattr * const nla[],
6118                             struct netlink_ext_ack *extack)
6119 {
6120         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6121         u8 genmask = nft_genmask_cur(net);
6122         int family = nfmsg->nfgen_family;
6123         const struct nft_table *table;
6124         struct nft_object *obj;
6125         struct sk_buff *skb2;
6126         bool reset = false;
6127         u32 objtype;
6128         int err;
6129
6130         if (nlh->nlmsg_flags & NLM_F_DUMP) {
6131                 struct netlink_dump_control c = {
6132                         .start = nf_tables_dump_obj_start,
6133                         .dump = nf_tables_dump_obj,
6134                         .done = nf_tables_dump_obj_done,
6135                         .module = THIS_MODULE,
6136                         .data = (void *)nla,
6137                 };
6138
6139                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6140         }
6141
6142         if (!nla[NFTA_OBJ_NAME] ||
6143             !nla[NFTA_OBJ_TYPE])
6144                 return -EINVAL;
6145
6146         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6147         if (IS_ERR(table)) {
6148                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6149                 return PTR_ERR(table);
6150         }
6151
6152         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6153         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6154         if (IS_ERR(obj)) {
6155                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6156                 return PTR_ERR(obj);
6157         }
6158
6159         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6160         if (!skb2)
6161                 return -ENOMEM;
6162
6163         if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6164                 reset = true;
6165
6166         if (reset) {
6167                 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
6168                                       table->name, table->handle);
6169
6170                 audit_log_nfcfg(buf,
6171                                 family,
6172                                 obj->handle,
6173                                 AUDIT_NFT_OP_OBJ_RESET,
6174                                 GFP_ATOMIC);
6175                 kfree(buf);
6176         }
6177
6178         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6179                                       nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6180                                       family, table, obj, reset);
6181         if (err < 0)
6182                 goto err;
6183
6184         return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6185 err:
6186         kfree_skb(skb2);
6187         return err;
6188 }
6189
6190 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6191 {
6192         if (obj->ops->destroy)
6193                 obj->ops->destroy(ctx, obj);
6194
6195         module_put(obj->ops->type->owner);
6196         kfree(obj->key.name);
6197         kfree(obj);
6198 }
6199
6200 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
6201                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6202                             const struct nlattr * const nla[],
6203                             struct netlink_ext_ack *extack)
6204 {
6205         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6206         u8 genmask = nft_genmask_next(net);
6207         int family = nfmsg->nfgen_family;
6208         const struct nlattr *attr;
6209         struct nft_table *table;
6210         struct nft_object *obj;
6211         struct nft_ctx ctx;
6212         u32 objtype;
6213
6214         if (!nla[NFTA_OBJ_TYPE] ||
6215             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6216                 return -EINVAL;
6217
6218         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6219         if (IS_ERR(table)) {
6220                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6221                 return PTR_ERR(table);
6222         }
6223
6224         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6225         if (nla[NFTA_OBJ_HANDLE]) {
6226                 attr = nla[NFTA_OBJ_HANDLE];
6227                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6228         } else {
6229                 attr = nla[NFTA_OBJ_NAME];
6230                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6231         }
6232
6233         if (IS_ERR(obj)) {
6234                 NL_SET_BAD_ATTR(extack, attr);
6235                 return PTR_ERR(obj);
6236         }
6237         if (obj->use > 0) {
6238                 NL_SET_BAD_ATTR(extack, attr);
6239                 return -EBUSY;
6240         }
6241
6242         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6243
6244         return nft_delobj(&ctx, obj);
6245 }
6246
6247 void nft_obj_notify(struct net *net, const struct nft_table *table,
6248                     struct nft_object *obj, u32 portid, u32 seq, int event,
6249                     int family, int report, gfp_t gfp)
6250 {
6251         struct sk_buff *skb;
6252         int err;
6253         char *buf = kasprintf(gfp, "%s:%llu;?:0",
6254                               table->name, table->handle);
6255
6256         audit_log_nfcfg(buf,
6257                         family,
6258                         obj->handle,
6259                         event == NFT_MSG_NEWOBJ ?
6260                                 AUDIT_NFT_OP_OBJ_REGISTER :
6261                                 AUDIT_NFT_OP_OBJ_UNREGISTER,
6262                         gfp);
6263         kfree(buf);
6264
6265         if (!report &&
6266             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6267                 return;
6268
6269         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6270         if (skb == NULL)
6271                 goto err;
6272
6273         err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6274                                       table, obj, false);
6275         if (err < 0) {
6276                 kfree_skb(skb);
6277                 goto err;
6278         }
6279
6280         nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
6281         return;
6282 err:
6283         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6284 }
6285 EXPORT_SYMBOL_GPL(nft_obj_notify);
6286
6287 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6288                                  struct nft_object *obj, int event)
6289 {
6290         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6291                        ctx->family, ctx->report, GFP_KERNEL);
6292 }
6293
6294 /*
6295  * Flow tables
6296  */
6297 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6298 {
6299         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6300         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6301         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6302 }
6303 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6304
6305 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6306 {
6307         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6308         list_del_rcu(&type->list);
6309         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6310 }
6311 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6312
6313 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6314         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
6315                                             .len = NFT_NAME_MAXLEN - 1 },
6316         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
6317                                             .len = NFT_NAME_MAXLEN - 1 },
6318         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
6319         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
6320         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
6321 };
6322
6323 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6324                                            const struct nlattr *nla, u8 genmask)
6325 {
6326         struct nft_flowtable *flowtable;
6327
6328         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6329                 if (!nla_strcmp(nla, flowtable->name) &&
6330                     nft_active_genmask(flowtable, genmask))
6331                         return flowtable;
6332         }
6333         return ERR_PTR(-ENOENT);
6334 }
6335 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6336
6337 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6338                                     struct nft_flowtable *flowtable,
6339                                     enum nft_trans_phase phase)
6340 {
6341         switch (phase) {
6342         case NFT_TRANS_PREPARE:
6343         case NFT_TRANS_ABORT:
6344         case NFT_TRANS_RELEASE:
6345                 flowtable->use--;
6346                 fallthrough;
6347         default:
6348                 return;
6349         }
6350 }
6351 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6352
6353 static struct nft_flowtable *
6354 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6355                               const struct nlattr *nla, u8 genmask)
6356 {
6357        struct nft_flowtable *flowtable;
6358
6359        list_for_each_entry(flowtable, &table->flowtables, list) {
6360                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6361                    nft_active_genmask(flowtable, genmask))
6362                        return flowtable;
6363        }
6364        return ERR_PTR(-ENOENT);
6365 }
6366
6367 struct nft_flowtable_hook {
6368         u32                     num;
6369         int                     priority;
6370         struct list_head        list;
6371 };
6372
6373 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6374         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
6375         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
6376         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
6377 };
6378
6379 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6380                                     const struct nlattr *attr,
6381                                     struct nft_flowtable_hook *flowtable_hook,
6382                                     struct nft_flowtable *flowtable, bool add)
6383 {
6384         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6385         struct nft_hook *hook;
6386         int hooknum, priority;
6387         int err;
6388
6389         INIT_LIST_HEAD(&flowtable_hook->list);
6390
6391         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6392                                           nft_flowtable_hook_policy, NULL);
6393         if (err < 0)
6394                 return err;
6395
6396         if (add) {
6397                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6398                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6399                         return -EINVAL;
6400
6401                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6402                 if (hooknum != NF_NETDEV_INGRESS)
6403                         return -EOPNOTSUPP;
6404
6405                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6406
6407                 flowtable_hook->priority        = priority;
6408                 flowtable_hook->num             = hooknum;
6409         } else {
6410                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6411                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6412                         if (hooknum != flowtable->hooknum)
6413                                 return -EOPNOTSUPP;
6414                 }
6415
6416                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6417                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6418                         if (priority != flowtable->data.priority)
6419                                 return -EOPNOTSUPP;
6420                 }
6421
6422                 flowtable_hook->priority        = flowtable->data.priority;
6423                 flowtable_hook->num             = flowtable->hooknum;
6424         }
6425
6426         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6427                 err = nf_tables_parse_netdev_hooks(ctx->net,
6428                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
6429                                                    &flowtable_hook->list);
6430                 if (err < 0)
6431                         return err;
6432         }
6433
6434         list_for_each_entry(hook, &flowtable_hook->list, list) {
6435                 hook->ops.pf            = NFPROTO_NETDEV;
6436                 hook->ops.hooknum       = flowtable_hook->num;
6437                 hook->ops.priority      = flowtable_hook->priority;
6438                 hook->ops.priv          = &flowtable->data;
6439                 hook->ops.hook          = flowtable->data.type->hook;
6440         }
6441
6442         return err;
6443 }
6444
6445 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6446 {
6447         const struct nf_flowtable_type *type;
6448
6449         list_for_each_entry(type, &nf_tables_flowtables, list) {
6450                 if (family == type->family)
6451                         return type;
6452         }
6453         return NULL;
6454 }
6455
6456 static const struct nf_flowtable_type *
6457 nft_flowtable_type_get(struct net *net, u8 family)
6458 {
6459         const struct nf_flowtable_type *type;
6460
6461         type = __nft_flowtable_type_get(family);
6462         if (type != NULL && try_module_get(type->owner))
6463                 return type;
6464
6465         lockdep_nfnl_nft_mutex_not_held();
6466 #ifdef CONFIG_MODULES
6467         if (type == NULL) {
6468                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6469                         return ERR_PTR(-EAGAIN);
6470         }
6471 #endif
6472         return ERR_PTR(-ENOENT);
6473 }
6474
6475 /* Only called from error and netdev event paths. */
6476 static void nft_unregister_flowtable_hook(struct net *net,
6477                                           struct nft_flowtable *flowtable,
6478                                           struct nft_hook *hook)
6479 {
6480         nf_unregister_net_hook(net, &hook->ops);
6481         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6482                                     FLOW_BLOCK_UNBIND);
6483 }
6484
6485 static void nft_unregister_flowtable_net_hooks(struct net *net,
6486                                                struct list_head *hook_list)
6487 {
6488         struct nft_hook *hook;
6489
6490         list_for_each_entry(hook, hook_list, list)
6491                 nf_unregister_net_hook(net, &hook->ops);
6492 }
6493
6494 static int nft_register_flowtable_net_hooks(struct net *net,
6495                                             struct nft_table *table,
6496                                             struct list_head *hook_list,
6497                                             struct nft_flowtable *flowtable)
6498 {
6499         struct nft_hook *hook, *hook2, *next;
6500         struct nft_flowtable *ft;
6501         int err, i = 0;
6502
6503         list_for_each_entry(hook, hook_list, list) {
6504                 list_for_each_entry(ft, &table->flowtables, list) {
6505                         list_for_each_entry(hook2, &ft->hook_list, list) {
6506                                 if (hook->ops.dev == hook2->ops.dev &&
6507                                     hook->ops.pf == hook2->ops.pf) {
6508                                         err = -EEXIST;
6509                                         goto err_unregister_net_hooks;
6510                                 }
6511                         }
6512                 }
6513
6514                 err = flowtable->data.type->setup(&flowtable->data,
6515                                                   hook->ops.dev,
6516                                                   FLOW_BLOCK_BIND);
6517                 if (err < 0)
6518                         goto err_unregister_net_hooks;
6519
6520                 err = nf_register_net_hook(net, &hook->ops);
6521                 if (err < 0) {
6522                         flowtable->data.type->setup(&flowtable->data,
6523                                                     hook->ops.dev,
6524                                                     FLOW_BLOCK_UNBIND);
6525                         goto err_unregister_net_hooks;
6526                 }
6527
6528                 i++;
6529         }
6530
6531         return 0;
6532
6533 err_unregister_net_hooks:
6534         list_for_each_entry_safe(hook, next, hook_list, list) {
6535                 if (i-- <= 0)
6536                         break;
6537
6538                 nft_unregister_flowtable_hook(net, flowtable, hook);
6539                 list_del_rcu(&hook->list);
6540                 kfree_rcu(hook, rcu);
6541         }
6542
6543         return err;
6544 }
6545
6546 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6547 {
6548         struct nft_hook *hook, *next;
6549
6550         list_for_each_entry_safe(hook, next, hook_list, list) {
6551                 list_del_rcu(&hook->list);
6552                 kfree_rcu(hook, rcu);
6553         }
6554 }
6555
6556 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6557                                 struct nft_flowtable *flowtable)
6558 {
6559         const struct nlattr * const *nla = ctx->nla;
6560         struct nft_flowtable_hook flowtable_hook;
6561         struct nft_hook *hook, *next;
6562         struct nft_trans *trans;
6563         bool unregister = false;
6564         int err;
6565
6566         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6567                                        &flowtable_hook, flowtable, false);
6568         if (err < 0)
6569                 return err;
6570
6571         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6572                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6573                         list_del(&hook->list);
6574                         kfree(hook);
6575                 }
6576         }
6577
6578         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6579                                                &flowtable_hook.list, flowtable);
6580         if (err < 0)
6581                 goto err_flowtable_update_hook;
6582
6583         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6584                                 sizeof(struct nft_trans_flowtable));
6585         if (!trans) {
6586                 unregister = true;
6587                 err = -ENOMEM;
6588                 goto err_flowtable_update_hook;
6589         }
6590
6591         nft_trans_flowtable(trans) = flowtable;
6592         nft_trans_flowtable_update(trans) = true;
6593         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6594         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6595
6596         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6597
6598         return 0;
6599
6600 err_flowtable_update_hook:
6601         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6602                 if (unregister)
6603                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6604                 list_del_rcu(&hook->list);
6605                 kfree_rcu(hook, rcu);
6606         }
6607
6608         return err;
6609
6610 }
6611
6612 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6613                                   struct sk_buff *skb,
6614                                   const struct nlmsghdr *nlh,
6615                                   const struct nlattr * const nla[],
6616                                   struct netlink_ext_ack *extack)
6617 {
6618         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6619         struct nft_flowtable_hook flowtable_hook;
6620         const struct nf_flowtable_type *type;
6621         u8 genmask = nft_genmask_next(net);
6622         int family = nfmsg->nfgen_family;
6623         struct nft_flowtable *flowtable;
6624         struct nft_hook *hook, *next;
6625         struct nft_table *table;
6626         struct nft_ctx ctx;
6627         int err;
6628
6629         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6630             !nla[NFTA_FLOWTABLE_NAME] ||
6631             !nla[NFTA_FLOWTABLE_HOOK])
6632                 return -EINVAL;
6633
6634         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6635                                  genmask);
6636         if (IS_ERR(table)) {
6637                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6638                 return PTR_ERR(table);
6639         }
6640
6641         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6642                                          genmask);
6643         if (IS_ERR(flowtable)) {
6644                 err = PTR_ERR(flowtable);
6645                 if (err != -ENOENT) {
6646                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6647                         return err;
6648                 }
6649         } else {
6650                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6651                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6652                         return -EEXIST;
6653                 }
6654
6655                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6656
6657                 return nft_flowtable_update(&ctx, nlh, flowtable);
6658         }
6659
6660         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6661
6662         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6663         if (!flowtable)
6664                 return -ENOMEM;
6665
6666         flowtable->table = table;
6667         flowtable->handle = nf_tables_alloc_handle(table);
6668         INIT_LIST_HEAD(&flowtable->hook_list);
6669
6670         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6671         if (!flowtable->name) {
6672                 err = -ENOMEM;
6673                 goto err1;
6674         }
6675
6676         type = nft_flowtable_type_get(net, family);
6677         if (IS_ERR(type)) {
6678                 err = PTR_ERR(type);
6679                 goto err2;
6680         }
6681
6682         if (nla[NFTA_FLOWTABLE_FLAGS]) {
6683                 flowtable->data.flags =
6684                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6685                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK)
6686                         goto err3;
6687         }
6688
6689         write_pnet(&flowtable->data.net, net);
6690         flowtable->data.type = type;
6691         err = type->init(&flowtable->data);
6692         if (err < 0)
6693                 goto err3;
6694
6695         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6696                                        &flowtable_hook, flowtable, true);
6697         if (err < 0)
6698                 goto err4;
6699
6700         list_splice(&flowtable_hook.list, &flowtable->hook_list);
6701         flowtable->data.priority = flowtable_hook.priority;
6702         flowtable->hooknum = flowtable_hook.num;
6703
6704         err = nft_register_flowtable_net_hooks(ctx.net, table,
6705                                                &flowtable->hook_list,
6706                                                flowtable);
6707         if (err < 0) {
6708                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
6709                 goto err4;
6710         }
6711
6712         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6713         if (err < 0)
6714                 goto err5;
6715
6716         list_add_tail_rcu(&flowtable->list, &table->flowtables);
6717         table->use++;
6718
6719         return 0;
6720 err5:
6721         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6722                 nft_unregister_flowtable_hook(net, flowtable, hook);
6723                 list_del_rcu(&hook->list);
6724                 kfree_rcu(hook, rcu);
6725         }
6726 err4:
6727         flowtable->data.type->free(&flowtable->data);
6728 err3:
6729         module_put(type->owner);
6730 err2:
6731         kfree(flowtable->name);
6732 err1:
6733         kfree(flowtable);
6734         return err;
6735 }
6736
6737 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
6738 {
6739         struct nft_hook *this, *next;
6740
6741         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
6742                 list_del(&this->list);
6743                 kfree(this);
6744         }
6745 }
6746
6747 static int nft_delflowtable_hook(struct nft_ctx *ctx,
6748                                  struct nft_flowtable *flowtable)
6749 {
6750         const struct nlattr * const *nla = ctx->nla;
6751         struct nft_flowtable_hook flowtable_hook;
6752         struct nft_hook *this, *hook;
6753         struct nft_trans *trans;
6754         int err;
6755
6756         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6757                                        &flowtable_hook, flowtable, false);
6758         if (err < 0)
6759                 return err;
6760
6761         list_for_each_entry(this, &flowtable_hook.list, list) {
6762                 hook = nft_hook_list_find(&flowtable->hook_list, this);
6763                 if (!hook) {
6764                         err = -ENOENT;
6765                         goto err_flowtable_del_hook;
6766                 }
6767                 hook->inactive = true;
6768         }
6769
6770         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
6771                                 sizeof(struct nft_trans_flowtable));
6772         if (!trans) {
6773                 err = -ENOMEM;
6774                 goto err_flowtable_del_hook;
6775         }
6776
6777         nft_trans_flowtable(trans) = flowtable;
6778         nft_trans_flowtable_update(trans) = true;
6779         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6780         nft_flowtable_hook_release(&flowtable_hook);
6781
6782         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6783
6784         return 0;
6785
6786 err_flowtable_del_hook:
6787         list_for_each_entry(this, &flowtable_hook.list, list) {
6788                 hook = nft_hook_list_find(&flowtable->hook_list, this);
6789                 if (!hook)
6790                         break;
6791
6792                 hook->inactive = false;
6793         }
6794         nft_flowtable_hook_release(&flowtable_hook);
6795
6796         return err;
6797 }
6798
6799 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
6800                                   struct sk_buff *skb,
6801                                   const struct nlmsghdr *nlh,
6802                                   const struct nlattr * const nla[],
6803                                   struct netlink_ext_ack *extack)
6804 {
6805         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6806         u8 genmask = nft_genmask_next(net);
6807         int family = nfmsg->nfgen_family;
6808         struct nft_flowtable *flowtable;
6809         const struct nlattr *attr;
6810         struct nft_table *table;
6811         struct nft_ctx ctx;
6812
6813         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6814             (!nla[NFTA_FLOWTABLE_NAME] &&
6815              !nla[NFTA_FLOWTABLE_HANDLE]))
6816                 return -EINVAL;
6817
6818         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6819                                  genmask);
6820         if (IS_ERR(table)) {
6821                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6822                 return PTR_ERR(table);
6823         }
6824
6825         if (nla[NFTA_FLOWTABLE_HANDLE]) {
6826                 attr = nla[NFTA_FLOWTABLE_HANDLE];
6827                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
6828         } else {
6829                 attr = nla[NFTA_FLOWTABLE_NAME];
6830                 flowtable = nft_flowtable_lookup(table, attr, genmask);
6831         }
6832
6833         if (IS_ERR(flowtable)) {
6834                 NL_SET_BAD_ATTR(extack, attr);
6835                 return PTR_ERR(flowtable);
6836         }
6837
6838         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6839
6840         if (nla[NFTA_FLOWTABLE_HOOK])
6841                 return nft_delflowtable_hook(&ctx, flowtable);
6842
6843         if (flowtable->use > 0) {
6844                 NL_SET_BAD_ATTR(extack, attr);
6845                 return -EBUSY;
6846         }
6847
6848         return nft_delflowtable(&ctx, flowtable);
6849 }
6850
6851 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
6852                                          u32 portid, u32 seq, int event,
6853                                          u32 flags, int family,
6854                                          struct nft_flowtable *flowtable,
6855                                          struct list_head *hook_list)
6856 {
6857         struct nlattr *nest, *nest_devs;
6858         struct nfgenmsg *nfmsg;
6859         struct nft_hook *hook;
6860         struct nlmsghdr *nlh;
6861
6862         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6863         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6864         if (nlh == NULL)
6865                 goto nla_put_failure;
6866
6867         nfmsg = nlmsg_data(nlh);
6868         nfmsg->nfgen_family     = family;
6869         nfmsg->version          = NFNETLINK_V0;
6870         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
6871
6872         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
6873             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
6874             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
6875             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
6876                          NFTA_FLOWTABLE_PAD) ||
6877             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
6878                 goto nla_put_failure;
6879
6880         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
6881         if (!nest)
6882                 goto nla_put_failure;
6883         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
6884             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
6885                 goto nla_put_failure;
6886
6887         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
6888         if (!nest_devs)
6889                 goto nla_put_failure;
6890
6891         list_for_each_entry_rcu(hook, hook_list, list) {
6892                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
6893                         goto nla_put_failure;
6894         }
6895         nla_nest_end(skb, nest_devs);
6896         nla_nest_end(skb, nest);
6897
6898         nlmsg_end(skb, nlh);
6899         return 0;
6900
6901 nla_put_failure:
6902         nlmsg_trim(skb, nlh);
6903         return -1;
6904 }
6905
6906 struct nft_flowtable_filter {
6907         char            *table;
6908 };
6909
6910 static int nf_tables_dump_flowtable(struct sk_buff *skb,
6911                                     struct netlink_callback *cb)
6912 {
6913         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6914         struct nft_flowtable_filter *filter = cb->data;
6915         unsigned int idx = 0, s_idx = cb->args[0];
6916         struct net *net = sock_net(skb->sk);
6917         int family = nfmsg->nfgen_family;
6918         struct nft_flowtable *flowtable;
6919         const struct nft_table *table;
6920
6921         rcu_read_lock();
6922         cb->seq = net->nft.base_seq;
6923
6924         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6925                 if (family != NFPROTO_UNSPEC && family != table->family)
6926                         continue;
6927
6928                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6929                         if (!nft_is_active(net, flowtable))
6930                                 goto cont;
6931                         if (idx < s_idx)
6932                                 goto cont;
6933                         if (idx > s_idx)
6934                                 memset(&cb->args[1], 0,
6935                                        sizeof(cb->args) - sizeof(cb->args[0]));
6936                         if (filter && filter->table &&
6937                             strcmp(filter->table, table->name))
6938                                 goto cont;
6939
6940                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
6941                                                           cb->nlh->nlmsg_seq,
6942                                                           NFT_MSG_NEWFLOWTABLE,
6943                                                           NLM_F_MULTI | NLM_F_APPEND,
6944                                                           table->family,
6945                                                           flowtable,
6946                                                           &flowtable->hook_list) < 0)
6947                                 goto done;
6948
6949                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6950 cont:
6951                         idx++;
6952                 }
6953         }
6954 done:
6955         rcu_read_unlock();
6956
6957         cb->args[0] = idx;
6958         return skb->len;
6959 }
6960
6961 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
6962 {
6963         const struct nlattr * const *nla = cb->data;
6964         struct nft_flowtable_filter *filter = NULL;
6965
6966         if (nla[NFTA_FLOWTABLE_TABLE]) {
6967                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6968                 if (!filter)
6969                         return -ENOMEM;
6970
6971                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
6972                                            GFP_ATOMIC);
6973                 if (!filter->table) {
6974                         kfree(filter);
6975                         return -ENOMEM;
6976                 }
6977         }
6978
6979         cb->data = filter;
6980         return 0;
6981 }
6982
6983 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
6984 {
6985         struct nft_flowtable_filter *filter = cb->data;
6986
6987         if (!filter)
6988                 return 0;
6989
6990         kfree(filter->table);
6991         kfree(filter);
6992
6993         return 0;
6994 }
6995
6996 /* called with rcu_read_lock held */
6997 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
6998                                   struct sk_buff *skb,
6999                                   const struct nlmsghdr *nlh,
7000                                   const struct nlattr * const nla[],
7001                                   struct netlink_ext_ack *extack)
7002 {
7003         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7004         u8 genmask = nft_genmask_cur(net);
7005         int family = nfmsg->nfgen_family;
7006         struct nft_flowtable *flowtable;
7007         const struct nft_table *table;
7008         struct sk_buff *skb2;
7009         int err;
7010
7011         if (nlh->nlmsg_flags & NLM_F_DUMP) {
7012                 struct netlink_dump_control c = {
7013                         .start = nf_tables_dump_flowtable_start,
7014                         .dump = nf_tables_dump_flowtable,
7015                         .done = nf_tables_dump_flowtable_done,
7016                         .module = THIS_MODULE,
7017                         .data = (void *)nla,
7018                 };
7019
7020                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
7021         }
7022
7023         if (!nla[NFTA_FLOWTABLE_NAME])
7024                 return -EINVAL;
7025
7026         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7027                                  genmask);
7028         if (IS_ERR(table))
7029                 return PTR_ERR(table);
7030
7031         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7032                                          genmask);
7033         if (IS_ERR(flowtable))
7034                 return PTR_ERR(flowtable);
7035
7036         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7037         if (!skb2)
7038                 return -ENOMEM;
7039
7040         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7041                                             nlh->nlmsg_seq,
7042                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7043                                             flowtable, &flowtable->hook_list);
7044         if (err < 0)
7045                 goto err;
7046
7047         return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
7048 err:
7049         kfree_skb(skb2);
7050         return err;
7051 }
7052
7053 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7054                                        struct nft_flowtable *flowtable,
7055                                        struct list_head *hook_list,
7056                                        int event)
7057 {
7058         struct sk_buff *skb;
7059         int err;
7060         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7061                               flowtable->table->name, flowtable->table->handle,
7062                               flowtable->name, flowtable->handle);
7063
7064         audit_log_nfcfg(buf,
7065                         ctx->family,
7066                         flowtable->hooknum,
7067                         event == NFT_MSG_NEWFLOWTABLE ?
7068                                 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
7069                                 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7070                         GFP_KERNEL);
7071         kfree(buf);
7072
7073         if (ctx->report &&
7074             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7075                 return;
7076
7077         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7078         if (skb == NULL)
7079                 goto err;
7080
7081         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7082                                             ctx->seq, event, 0,
7083                                             ctx->family, flowtable, hook_list);
7084         if (err < 0) {
7085                 kfree_skb(skb);
7086                 goto err;
7087         }
7088
7089         nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
7090                        ctx->report, GFP_KERNEL);
7091         return;
7092 err:
7093         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7094 }
7095
7096 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7097 {
7098         struct nft_hook *hook, *next;
7099
7100         flowtable->data.type->free(&flowtable->data);
7101         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7102                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7103                                             FLOW_BLOCK_UNBIND);
7104                 list_del_rcu(&hook->list);
7105                 kfree(hook);
7106         }
7107         kfree(flowtable->name);
7108         module_put(flowtable->data.type->owner);
7109         kfree(flowtable);
7110 }
7111
7112 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7113                                    u32 portid, u32 seq)
7114 {
7115         struct nlmsghdr *nlh;
7116         struct nfgenmsg *nfmsg;
7117         char buf[TASK_COMM_LEN];
7118         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7119
7120         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7121         if (nlh == NULL)
7122                 goto nla_put_failure;
7123
7124         nfmsg = nlmsg_data(nlh);
7125         nfmsg->nfgen_family     = AF_UNSPEC;
7126         nfmsg->version          = NFNETLINK_V0;
7127         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7128
7129         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7130             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7131             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7132                 goto nla_put_failure;
7133
7134         nlmsg_end(skb, nlh);
7135         return 0;
7136
7137 nla_put_failure:
7138         nlmsg_trim(skb, nlh);
7139         return -EMSGSIZE;
7140 }
7141
7142 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7143                                 struct nft_flowtable *flowtable)
7144 {
7145         struct nft_hook *hook;
7146
7147         list_for_each_entry(hook, &flowtable->hook_list, list) {
7148                 if (hook->ops.dev != dev)
7149                         continue;
7150
7151                 /* flow_offload_netdev_event() cleans up entries for us. */
7152                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7153                 list_del_rcu(&hook->list);
7154                 kfree_rcu(hook, rcu);
7155                 break;
7156         }
7157 }
7158
7159 static int nf_tables_flowtable_event(struct notifier_block *this,
7160                                      unsigned long event, void *ptr)
7161 {
7162         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7163         struct nft_flowtable *flowtable;
7164         struct nft_table *table;
7165         struct net *net;
7166
7167         if (event != NETDEV_UNREGISTER)
7168                 return 0;
7169
7170         net = dev_net(dev);
7171         mutex_lock(&net->nft.commit_mutex);
7172         list_for_each_entry(table, &net->nft.tables, list) {
7173                 list_for_each_entry(flowtable, &table->flowtables, list) {
7174                         nft_flowtable_event(event, dev, flowtable);
7175                 }
7176         }
7177         mutex_unlock(&net->nft.commit_mutex);
7178
7179         return NOTIFY_DONE;
7180 }
7181
7182 static struct notifier_block nf_tables_flowtable_notifier = {
7183         .notifier_call  = nf_tables_flowtable_event,
7184 };
7185
7186 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7187                                  int event)
7188 {
7189         struct nlmsghdr *nlh = nlmsg_hdr(skb);
7190         struct sk_buff *skb2;
7191         int err;
7192
7193         audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
7194                         AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
7195
7196         if (nlmsg_report(nlh) &&
7197             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7198                 return;
7199
7200         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7201         if (skb2 == NULL)
7202                 goto err;
7203
7204         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7205                                       nlh->nlmsg_seq);
7206         if (err < 0) {
7207                 kfree_skb(skb2);
7208                 goto err;
7209         }
7210
7211         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7212                        nlmsg_report(nlh), GFP_KERNEL);
7213         return;
7214 err:
7215         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7216                           -ENOBUFS);
7217 }
7218
7219 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7220                             struct sk_buff *skb, const struct nlmsghdr *nlh,
7221                             const struct nlattr * const nla[],
7222                             struct netlink_ext_ack *extack)
7223 {
7224         struct sk_buff *skb2;
7225         int err;
7226
7227         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7228         if (skb2 == NULL)
7229                 return -ENOMEM;
7230
7231         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7232                                       nlh->nlmsg_seq);
7233         if (err < 0)
7234                 goto err;
7235
7236         return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
7237 err:
7238         kfree_skb(skb2);
7239         return err;
7240 }
7241
7242 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7243         [NFT_MSG_NEWTABLE] = {
7244                 .call_batch     = nf_tables_newtable,
7245                 .attr_count     = NFTA_TABLE_MAX,
7246                 .policy         = nft_table_policy,
7247         },
7248         [NFT_MSG_GETTABLE] = {
7249                 .call_rcu       = nf_tables_gettable,
7250                 .attr_count     = NFTA_TABLE_MAX,
7251                 .policy         = nft_table_policy,
7252         },
7253         [NFT_MSG_DELTABLE] = {
7254                 .call_batch     = nf_tables_deltable,
7255                 .attr_count     = NFTA_TABLE_MAX,
7256                 .policy         = nft_table_policy,
7257         },
7258         [NFT_MSG_NEWCHAIN] = {
7259                 .call_batch     = nf_tables_newchain,
7260                 .attr_count     = NFTA_CHAIN_MAX,
7261                 .policy         = nft_chain_policy,
7262         },
7263         [NFT_MSG_GETCHAIN] = {
7264                 .call_rcu       = nf_tables_getchain,
7265                 .attr_count     = NFTA_CHAIN_MAX,
7266                 .policy         = nft_chain_policy,
7267         },
7268         [NFT_MSG_DELCHAIN] = {
7269                 .call_batch     = nf_tables_delchain,
7270                 .attr_count     = NFTA_CHAIN_MAX,
7271                 .policy         = nft_chain_policy,
7272         },
7273         [NFT_MSG_NEWRULE] = {
7274                 .call_batch     = nf_tables_newrule,
7275                 .attr_count     = NFTA_RULE_MAX,
7276                 .policy         = nft_rule_policy,
7277         },
7278         [NFT_MSG_GETRULE] = {
7279                 .call_rcu       = nf_tables_getrule,
7280                 .attr_count     = NFTA_RULE_MAX,
7281                 .policy         = nft_rule_policy,
7282         },
7283         [NFT_MSG_DELRULE] = {
7284                 .call_batch     = nf_tables_delrule,
7285                 .attr_count     = NFTA_RULE_MAX,
7286                 .policy         = nft_rule_policy,
7287         },
7288         [NFT_MSG_NEWSET] = {
7289                 .call_batch     = nf_tables_newset,
7290                 .attr_count     = NFTA_SET_MAX,
7291                 .policy         = nft_set_policy,
7292         },
7293         [NFT_MSG_GETSET] = {
7294                 .call_rcu       = nf_tables_getset,
7295                 .attr_count     = NFTA_SET_MAX,
7296                 .policy         = nft_set_policy,
7297         },
7298         [NFT_MSG_DELSET] = {
7299                 .call_batch     = nf_tables_delset,
7300                 .attr_count     = NFTA_SET_MAX,
7301                 .policy         = nft_set_policy,
7302         },
7303         [NFT_MSG_NEWSETELEM] = {
7304                 .call_batch     = nf_tables_newsetelem,
7305                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7306                 .policy         = nft_set_elem_list_policy,
7307         },
7308         [NFT_MSG_GETSETELEM] = {
7309                 .call_rcu       = nf_tables_getsetelem,
7310                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7311                 .policy         = nft_set_elem_list_policy,
7312         },
7313         [NFT_MSG_DELSETELEM] = {
7314                 .call_batch     = nf_tables_delsetelem,
7315                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7316                 .policy         = nft_set_elem_list_policy,
7317         },
7318         [NFT_MSG_GETGEN] = {
7319                 .call_rcu       = nf_tables_getgen,
7320         },
7321         [NFT_MSG_NEWOBJ] = {
7322                 .call_batch     = nf_tables_newobj,
7323                 .attr_count     = NFTA_OBJ_MAX,
7324                 .policy         = nft_obj_policy,
7325         },
7326         [NFT_MSG_GETOBJ] = {
7327                 .call_rcu       = nf_tables_getobj,
7328                 .attr_count     = NFTA_OBJ_MAX,
7329                 .policy         = nft_obj_policy,
7330         },
7331         [NFT_MSG_DELOBJ] = {
7332                 .call_batch     = nf_tables_delobj,
7333                 .attr_count     = NFTA_OBJ_MAX,
7334                 .policy         = nft_obj_policy,
7335         },
7336         [NFT_MSG_GETOBJ_RESET] = {
7337                 .call_rcu       = nf_tables_getobj,
7338                 .attr_count     = NFTA_OBJ_MAX,
7339                 .policy         = nft_obj_policy,
7340         },
7341         [NFT_MSG_NEWFLOWTABLE] = {
7342                 .call_batch     = nf_tables_newflowtable,
7343                 .attr_count     = NFTA_FLOWTABLE_MAX,
7344                 .policy         = nft_flowtable_policy,
7345         },
7346         [NFT_MSG_GETFLOWTABLE] = {
7347                 .call_rcu       = nf_tables_getflowtable,
7348                 .attr_count     = NFTA_FLOWTABLE_MAX,
7349                 .policy         = nft_flowtable_policy,
7350         },
7351         [NFT_MSG_DELFLOWTABLE] = {
7352                 .call_batch     = nf_tables_delflowtable,
7353                 .attr_count     = NFTA_FLOWTABLE_MAX,
7354                 .policy         = nft_flowtable_policy,
7355         },
7356 };
7357
7358 static int nf_tables_validate(struct net *net)
7359 {
7360         struct nft_table *table;
7361
7362         switch (net->nft.validate_state) {
7363         case NFT_VALIDATE_SKIP:
7364                 break;
7365         case NFT_VALIDATE_NEED:
7366                 nft_validate_state_update(net, NFT_VALIDATE_DO);
7367                 fallthrough;
7368         case NFT_VALIDATE_DO:
7369                 list_for_each_entry(table, &net->nft.tables, list) {
7370                         if (nft_table_validate(net, table) < 0)
7371                                 return -EAGAIN;
7372                 }
7373                 break;
7374         }
7375
7376         return 0;
7377 }
7378
7379 /* a drop policy has to be deferred until all rules have been activated,
7380  * otherwise a large ruleset that contains a drop-policy base chain will
7381  * cause all packets to get dropped until the full transaction has been
7382  * processed.
7383  *
7384  * We defer the drop policy until the transaction has been finalized.
7385  */
7386 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7387 {
7388         struct nft_base_chain *basechain;
7389
7390         if (nft_trans_chain_policy(trans) != NF_DROP)
7391                 return;
7392
7393         if (!nft_is_base_chain(trans->ctx.chain))
7394                 return;
7395
7396         basechain = nft_base_chain(trans->ctx.chain);
7397         basechain->policy = NF_DROP;
7398 }
7399
7400 static void nft_chain_commit_update(struct nft_trans *trans)
7401 {
7402         struct nft_base_chain *basechain;
7403
7404         if (nft_trans_chain_name(trans)) {
7405                 rhltable_remove(&trans->ctx.table->chains_ht,
7406                                 &trans->ctx.chain->rhlhead,
7407                                 nft_chain_ht_params);
7408                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
7409                 rhltable_insert_key(&trans->ctx.table->chains_ht,
7410                                     trans->ctx.chain->name,
7411                                     &trans->ctx.chain->rhlhead,
7412                                     nft_chain_ht_params);
7413         }
7414
7415         if (!nft_is_base_chain(trans->ctx.chain))
7416                 return;
7417
7418         nft_chain_stats_replace(trans);
7419
7420         basechain = nft_base_chain(trans->ctx.chain);
7421
7422         switch (nft_trans_chain_policy(trans)) {
7423         case NF_DROP:
7424         case NF_ACCEPT:
7425                 basechain->policy = nft_trans_chain_policy(trans);
7426                 break;
7427         }
7428 }
7429
7430 static void nft_obj_commit_update(struct nft_trans *trans)
7431 {
7432         struct nft_object *newobj;
7433         struct nft_object *obj;
7434
7435         obj = nft_trans_obj(trans);
7436         newobj = nft_trans_obj_newobj(trans);
7437
7438         if (obj->ops->update)
7439                 obj->ops->update(obj, newobj);
7440
7441         kfree(newobj);
7442 }
7443
7444 static void nft_commit_release(struct nft_trans *trans)
7445 {
7446         switch (trans->msg_type) {
7447         case NFT_MSG_DELTABLE:
7448                 nf_tables_table_destroy(&trans->ctx);
7449                 break;
7450         case NFT_MSG_NEWCHAIN:
7451                 free_percpu(nft_trans_chain_stats(trans));
7452                 kfree(nft_trans_chain_name(trans));
7453                 break;
7454         case NFT_MSG_DELCHAIN:
7455                 nf_tables_chain_destroy(&trans->ctx);
7456                 break;
7457         case NFT_MSG_DELRULE:
7458                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7459                 break;
7460         case NFT_MSG_DELSET:
7461                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7462                 break;
7463         case NFT_MSG_DELSETELEM:
7464                 nf_tables_set_elem_destroy(&trans->ctx,
7465                                            nft_trans_elem_set(trans),
7466                                            nft_trans_elem(trans).priv);
7467                 break;
7468         case NFT_MSG_DELOBJ:
7469                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7470                 break;
7471         case NFT_MSG_DELFLOWTABLE:
7472                 if (nft_trans_flowtable_update(trans))
7473                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7474                 else
7475                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7476                 break;
7477         }
7478
7479         if (trans->put_net)
7480                 put_net(trans->ctx.net);
7481
7482         kfree(trans);
7483 }
7484
7485 static void nf_tables_trans_destroy_work(struct work_struct *w)
7486 {
7487         struct nft_trans *trans, *next;
7488         LIST_HEAD(head);
7489
7490         spin_lock(&nf_tables_destroy_list_lock);
7491         list_splice_init(&nf_tables_destroy_list, &head);
7492         spin_unlock(&nf_tables_destroy_list_lock);
7493
7494         if (list_empty(&head))
7495                 return;
7496
7497         synchronize_rcu();
7498
7499         list_for_each_entry_safe(trans, next, &head, list) {
7500                 list_del(&trans->list);
7501                 nft_commit_release(trans);
7502         }
7503 }
7504
7505 void nf_tables_trans_destroy_flush_work(void)
7506 {
7507         flush_work(&trans_destroy_work);
7508 }
7509 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7510
7511 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7512 {
7513         struct nft_rule *rule;
7514         unsigned int alloc = 0;
7515         int i;
7516
7517         /* already handled or inactive chain? */
7518         if (chain->rules_next || !nft_is_active_next(net, chain))
7519                 return 0;
7520
7521         rule = list_entry(&chain->rules, struct nft_rule, list);
7522         i = 0;
7523
7524         list_for_each_entry_continue(rule, &chain->rules, list) {
7525                 if (nft_is_active_next(net, rule))
7526                         alloc++;
7527         }
7528
7529         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7530         if (!chain->rules_next)
7531                 return -ENOMEM;
7532
7533         list_for_each_entry_continue(rule, &chain->rules, list) {
7534                 if (nft_is_active_next(net, rule))
7535                         chain->rules_next[i++] = rule;
7536         }
7537
7538         chain->rules_next[i] = NULL;
7539         return 0;
7540 }
7541
7542 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7543 {
7544         struct nft_trans *trans, *next;
7545
7546         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7547                 struct nft_chain *chain = trans->ctx.chain;
7548
7549                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7550                     trans->msg_type == NFT_MSG_DELRULE) {
7551                         kvfree(chain->rules_next);
7552                         chain->rules_next = NULL;
7553                 }
7554         }
7555 }
7556
7557 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7558 {
7559         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7560
7561         kvfree(o->start);
7562 }
7563
7564 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7565 {
7566         struct nft_rule **r = rules;
7567         struct nft_rules_old *old;
7568
7569         while (*r)
7570                 r++;
7571
7572         r++;    /* rcu_head is after end marker */
7573         old = (void *) r;
7574         old->start = rules;
7575
7576         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7577 }
7578
7579 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7580 {
7581         struct nft_rule **g0, **g1;
7582         bool next_genbit;
7583
7584         next_genbit = nft_gencursor_next(net);
7585
7586         g0 = rcu_dereference_protected(chain->rules_gen_0,
7587                                        lockdep_commit_lock_is_held(net));
7588         g1 = rcu_dereference_protected(chain->rules_gen_1,
7589                                        lockdep_commit_lock_is_held(net));
7590
7591         /* No changes to this chain? */
7592         if (chain->rules_next == NULL) {
7593                 /* chain had no change in last or next generation */
7594                 if (g0 == g1)
7595                         return;
7596                 /*
7597                  * chain had no change in this generation; make sure next
7598                  * one uses same rules as current generation.
7599                  */
7600                 if (next_genbit) {
7601                         rcu_assign_pointer(chain->rules_gen_1, g0);
7602                         nf_tables_commit_chain_free_rules_old(g1);
7603                 } else {
7604                         rcu_assign_pointer(chain->rules_gen_0, g1);
7605                         nf_tables_commit_chain_free_rules_old(g0);
7606                 }
7607
7608                 return;
7609         }
7610
7611         if (next_genbit)
7612                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7613         else
7614                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7615
7616         chain->rules_next = NULL;
7617
7618         if (g0 == g1)
7619                 return;
7620
7621         if (next_genbit)
7622                 nf_tables_commit_chain_free_rules_old(g1);
7623         else
7624                 nf_tables_commit_chain_free_rules_old(g0);
7625 }
7626
7627 static void nft_obj_del(struct nft_object *obj)
7628 {
7629         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7630         list_del_rcu(&obj->list);
7631 }
7632
7633 void nft_chain_del(struct nft_chain *chain)
7634 {
7635         struct nft_table *table = chain->table;
7636
7637         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7638                                      nft_chain_ht_params));
7639         list_del_rcu(&chain->list);
7640 }
7641
7642 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7643                                     struct list_head *hook_list)
7644 {
7645         struct nft_hook *hook, *next;
7646
7647         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7648                 if (hook->inactive)
7649                         list_move(&hook->list, hook_list);
7650         }
7651 }
7652
7653 static void nf_tables_module_autoload_cleanup(struct net *net)
7654 {
7655         struct nft_module_request *req, *next;
7656
7657         WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7658         list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7659                 WARN_ON_ONCE(!req->done);
7660                 list_del(&req->list);
7661                 kfree(req);
7662         }
7663 }
7664
7665 static void nf_tables_commit_release(struct net *net)
7666 {
7667         struct nft_trans *trans;
7668
7669         /* all side effects have to be made visible.
7670          * For example, if a chain named 'foo' has been deleted, a
7671          * new transaction must not find it anymore.
7672          *
7673          * Memory reclaim happens asynchronously from work queue
7674          * to prevent expensive synchronize_rcu() in commit phase.
7675          */
7676         if (list_empty(&net->nft.commit_list)) {
7677                 nf_tables_module_autoload_cleanup(net);
7678                 mutex_unlock(&net->nft.commit_mutex);
7679                 return;
7680         }
7681
7682         trans = list_last_entry(&net->nft.commit_list,
7683                                 struct nft_trans, list);
7684         get_net(trans->ctx.net);
7685         WARN_ON_ONCE(trans->put_net);
7686
7687         trans->put_net = true;
7688         spin_lock(&nf_tables_destroy_list_lock);
7689         list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7690         spin_unlock(&nf_tables_destroy_list_lock);
7691
7692         nf_tables_module_autoload_cleanup(net);
7693         schedule_work(&trans_destroy_work);
7694
7695         mutex_unlock(&net->nft.commit_mutex);
7696 }
7697
7698 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
7699 {
7700         struct nft_trans *trans, *next;
7701         struct nft_trans_elem *te;
7702         struct nft_chain *chain;
7703         struct nft_table *table;
7704         int err;
7705
7706         if (list_empty(&net->nft.commit_list)) {
7707                 mutex_unlock(&net->nft.commit_mutex);
7708                 return 0;
7709         }
7710
7711         /* 0. Validate ruleset, otherwise roll back for error reporting. */
7712         if (nf_tables_validate(net) < 0)
7713                 return -EAGAIN;
7714
7715         err = nft_flow_rule_offload_commit(net);
7716         if (err < 0)
7717                 return err;
7718
7719         /* 1.  Allocate space for next generation rules_gen_X[] */
7720         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7721                 int ret;
7722
7723                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7724                     trans->msg_type == NFT_MSG_DELRULE) {
7725                         chain = trans->ctx.chain;
7726
7727                         ret = nf_tables_commit_chain_prepare(net, chain);
7728                         if (ret < 0) {
7729                                 nf_tables_commit_chain_prepare_cancel(net);
7730                                 return ret;
7731                         }
7732                 }
7733         }
7734
7735         /* step 2.  Make rules_gen_X visible to packet path */
7736         list_for_each_entry(table, &net->nft.tables, list) {
7737                 list_for_each_entry(chain, &table->chains, list)
7738                         nf_tables_commit_chain(net, chain);
7739         }
7740
7741         /*
7742          * Bump generation counter, invalidate any dump in progress.
7743          * Cannot fail after this point.
7744          */
7745         while (++net->nft.base_seq == 0);
7746
7747         /* step 3. Start new generation, rules_gen_X now in use. */
7748         net->nft.gencursor = nft_gencursor_next(net);
7749
7750         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7751                 switch (trans->msg_type) {
7752                 case NFT_MSG_NEWTABLE:
7753                         if (nft_trans_table_update(trans)) {
7754                                 if (!nft_trans_table_enable(trans)) {
7755                                         nf_tables_table_disable(net,
7756                                                                 trans->ctx.table);
7757                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7758                                 }
7759                         } else {
7760                                 nft_clear(net, trans->ctx.table);
7761                         }
7762                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
7763                         nft_trans_destroy(trans);
7764                         break;
7765                 case NFT_MSG_DELTABLE:
7766                         list_del_rcu(&trans->ctx.table->list);
7767                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
7768                         break;
7769                 case NFT_MSG_NEWCHAIN:
7770                         if (nft_trans_chain_update(trans)) {
7771                                 nft_chain_commit_update(trans);
7772                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7773                                 /* trans destroyed after rcu grace period */
7774                         } else {
7775                                 nft_chain_commit_drop_policy(trans);
7776                                 nft_clear(net, trans->ctx.chain);
7777                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7778                                 nft_trans_destroy(trans);
7779                         }
7780                         break;
7781                 case NFT_MSG_DELCHAIN:
7782                         nft_chain_del(trans->ctx.chain);
7783                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
7784                         nf_tables_unregister_hook(trans->ctx.net,
7785                                                   trans->ctx.table,
7786                                                   trans->ctx.chain);
7787                         break;
7788                 case NFT_MSG_NEWRULE:
7789                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
7790                         nf_tables_rule_notify(&trans->ctx,
7791                                               nft_trans_rule(trans),
7792                                               NFT_MSG_NEWRULE);
7793                         nft_trans_destroy(trans);
7794                         break;
7795                 case NFT_MSG_DELRULE:
7796                         list_del_rcu(&nft_trans_rule(trans)->list);
7797                         nf_tables_rule_notify(&trans->ctx,
7798                                               nft_trans_rule(trans),
7799                                               NFT_MSG_DELRULE);
7800                         nft_rule_expr_deactivate(&trans->ctx,
7801                                                  nft_trans_rule(trans),
7802                                                  NFT_TRANS_COMMIT);
7803                         break;
7804                 case NFT_MSG_NEWSET:
7805                         nft_clear(net, nft_trans_set(trans));
7806                         /* This avoids hitting -EBUSY when deleting the table
7807                          * from the transaction.
7808                          */
7809                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
7810                             !list_empty(&nft_trans_set(trans)->bindings))
7811                                 trans->ctx.table->use--;
7812
7813                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7814                                              NFT_MSG_NEWSET, GFP_KERNEL);
7815                         nft_trans_destroy(trans);
7816                         break;
7817                 case NFT_MSG_DELSET:
7818                         list_del_rcu(&nft_trans_set(trans)->list);
7819                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7820                                              NFT_MSG_DELSET, GFP_KERNEL);
7821                         break;
7822                 case NFT_MSG_NEWSETELEM:
7823                         te = (struct nft_trans_elem *)trans->data;
7824
7825                         te->set->ops->activate(net, te->set, &te->elem);
7826                         nf_tables_setelem_notify(&trans->ctx, te->set,
7827                                                  &te->elem,
7828                                                  NFT_MSG_NEWSETELEM, 0);
7829                         nft_trans_destroy(trans);
7830                         break;
7831                 case NFT_MSG_DELSETELEM:
7832                         te = (struct nft_trans_elem *)trans->data;
7833
7834                         nf_tables_setelem_notify(&trans->ctx, te->set,
7835                                                  &te->elem,
7836                                                  NFT_MSG_DELSETELEM, 0);
7837                         te->set->ops->remove(net, te->set, &te->elem);
7838                         atomic_dec(&te->set->nelems);
7839                         te->set->ndeact--;
7840                         break;
7841                 case NFT_MSG_NEWOBJ:
7842                         if (nft_trans_obj_update(trans)) {
7843                                 nft_obj_commit_update(trans);
7844                                 nf_tables_obj_notify(&trans->ctx,
7845                                                      nft_trans_obj(trans),
7846                                                      NFT_MSG_NEWOBJ);
7847                         } else {
7848                                 nft_clear(net, nft_trans_obj(trans));
7849                                 nf_tables_obj_notify(&trans->ctx,
7850                                                      nft_trans_obj(trans),
7851                                                      NFT_MSG_NEWOBJ);
7852                                 nft_trans_destroy(trans);
7853                         }
7854                         break;
7855                 case NFT_MSG_DELOBJ:
7856                         nft_obj_del(nft_trans_obj(trans));
7857                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
7858                                              NFT_MSG_DELOBJ);
7859                         break;
7860                 case NFT_MSG_NEWFLOWTABLE:
7861                         if (nft_trans_flowtable_update(trans)) {
7862                                 nf_tables_flowtable_notify(&trans->ctx,
7863                                                            nft_trans_flowtable(trans),
7864                                                            &nft_trans_flowtable_hooks(trans),
7865                                                            NFT_MSG_NEWFLOWTABLE);
7866                                 list_splice(&nft_trans_flowtable_hooks(trans),
7867                                             &nft_trans_flowtable(trans)->hook_list);
7868                         } else {
7869                                 nft_clear(net, nft_trans_flowtable(trans));
7870                                 nf_tables_flowtable_notify(&trans->ctx,
7871                                                            nft_trans_flowtable(trans),
7872                                                            &nft_trans_flowtable(trans)->hook_list,
7873                                                            NFT_MSG_NEWFLOWTABLE);
7874                         }
7875                         nft_trans_destroy(trans);
7876                         break;
7877                 case NFT_MSG_DELFLOWTABLE:
7878                         if (nft_trans_flowtable_update(trans)) {
7879                                 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
7880                                                         &nft_trans_flowtable_hooks(trans));
7881                                 nf_tables_flowtable_notify(&trans->ctx,
7882                                                            nft_trans_flowtable(trans),
7883                                                            &nft_trans_flowtable_hooks(trans),
7884                                                            NFT_MSG_DELFLOWTABLE);
7885                                 nft_unregister_flowtable_net_hooks(net,
7886                                                                    &nft_trans_flowtable_hooks(trans));
7887                         } else {
7888                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
7889                                 nf_tables_flowtable_notify(&trans->ctx,
7890                                                            nft_trans_flowtable(trans),
7891                                                            &nft_trans_flowtable(trans)->hook_list,
7892                                                            NFT_MSG_DELFLOWTABLE);
7893                                 nft_unregister_flowtable_net_hooks(net,
7894                                                 &nft_trans_flowtable(trans)->hook_list);
7895                         }
7896                         break;
7897                 }
7898         }
7899
7900         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
7901         nf_tables_commit_release(net);
7902
7903         return 0;
7904 }
7905
7906 static void nf_tables_module_autoload(struct net *net)
7907 {
7908         struct nft_module_request *req, *next;
7909         LIST_HEAD(module_list);
7910
7911         list_splice_init(&net->nft.module_list, &module_list);
7912         mutex_unlock(&net->nft.commit_mutex);
7913         list_for_each_entry_safe(req, next, &module_list, list) {
7914                 request_module("%s", req->module);
7915                 req->done = true;
7916         }
7917         mutex_lock(&net->nft.commit_mutex);
7918         list_splice(&module_list, &net->nft.module_list);
7919 }
7920
7921 static void nf_tables_abort_release(struct nft_trans *trans)
7922 {
7923         switch (trans->msg_type) {
7924         case NFT_MSG_NEWTABLE:
7925                 nf_tables_table_destroy(&trans->ctx);
7926                 break;
7927         case NFT_MSG_NEWCHAIN:
7928                 nf_tables_chain_destroy(&trans->ctx);
7929                 break;
7930         case NFT_MSG_NEWRULE:
7931                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7932                 break;
7933         case NFT_MSG_NEWSET:
7934                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7935                 break;
7936         case NFT_MSG_NEWSETELEM:
7937                 nft_set_elem_destroy(nft_trans_elem_set(trans),
7938                                      nft_trans_elem(trans).priv, true);
7939                 break;
7940         case NFT_MSG_NEWOBJ:
7941                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7942                 break;
7943         case NFT_MSG_NEWFLOWTABLE:
7944                 if (nft_trans_flowtable_update(trans))
7945                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7946                 else
7947                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7948                 break;
7949         }
7950         kfree(trans);
7951 }
7952
7953 static int __nf_tables_abort(struct net *net, bool autoload)
7954 {
7955         struct nft_trans *trans, *next;
7956         struct nft_trans_elem *te;
7957         struct nft_hook *hook;
7958
7959         list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
7960                                          list) {
7961                 switch (trans->msg_type) {
7962                 case NFT_MSG_NEWTABLE:
7963                         if (nft_trans_table_update(trans)) {
7964                                 if (nft_trans_table_enable(trans)) {
7965                                         nf_tables_table_disable(net,
7966                                                                 trans->ctx.table);
7967                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7968                                 }
7969                                 nft_trans_destroy(trans);
7970                         } else {
7971                                 list_del_rcu(&trans->ctx.table->list);
7972                         }
7973                         break;
7974                 case NFT_MSG_DELTABLE:
7975                         nft_clear(trans->ctx.net, trans->ctx.table);
7976                         nft_trans_destroy(trans);
7977                         break;
7978                 case NFT_MSG_NEWCHAIN:
7979                         if (nft_trans_chain_update(trans)) {
7980                                 free_percpu(nft_trans_chain_stats(trans));
7981                                 kfree(nft_trans_chain_name(trans));
7982                                 nft_trans_destroy(trans);
7983                         } else {
7984                                 if (nft_chain_is_bound(trans->ctx.chain)) {
7985                                         nft_trans_destroy(trans);
7986                                         break;
7987                                 }
7988                                 trans->ctx.table->use--;
7989                                 nft_chain_del(trans->ctx.chain);
7990                                 nf_tables_unregister_hook(trans->ctx.net,
7991                                                           trans->ctx.table,
7992                                                           trans->ctx.chain);
7993                         }
7994                         break;
7995                 case NFT_MSG_DELCHAIN:
7996                         trans->ctx.table->use++;
7997                         nft_clear(trans->ctx.net, trans->ctx.chain);
7998                         nft_trans_destroy(trans);
7999                         break;
8000                 case NFT_MSG_NEWRULE:
8001                         trans->ctx.chain->use--;
8002                         list_del_rcu(&nft_trans_rule(trans)->list);
8003                         nft_rule_expr_deactivate(&trans->ctx,
8004                                                  nft_trans_rule(trans),
8005                                                  NFT_TRANS_ABORT);
8006                         break;
8007                 case NFT_MSG_DELRULE:
8008                         trans->ctx.chain->use++;
8009                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8010                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8011                         nft_trans_destroy(trans);
8012                         break;
8013                 case NFT_MSG_NEWSET:
8014                         trans->ctx.table->use--;
8015                         if (nft_trans_set_bound(trans)) {
8016                                 nft_trans_destroy(trans);
8017                                 break;
8018                         }
8019                         list_del_rcu(&nft_trans_set(trans)->list);
8020                         break;
8021                 case NFT_MSG_DELSET:
8022                         trans->ctx.table->use++;
8023                         nft_clear(trans->ctx.net, nft_trans_set(trans));
8024                         nft_trans_destroy(trans);
8025                         break;
8026                 case NFT_MSG_NEWSETELEM:
8027                         if (nft_trans_elem_set_bound(trans)) {
8028                                 nft_trans_destroy(trans);
8029                                 break;
8030                         }
8031                         te = (struct nft_trans_elem *)trans->data;
8032                         te->set->ops->remove(net, te->set, &te->elem);
8033                         atomic_dec(&te->set->nelems);
8034                         break;
8035                 case NFT_MSG_DELSETELEM:
8036                         te = (struct nft_trans_elem *)trans->data;
8037
8038                         nft_set_elem_activate(net, te->set, &te->elem);
8039                         te->set->ops->activate(net, te->set, &te->elem);
8040                         te->set->ndeact--;
8041
8042                         nft_trans_destroy(trans);
8043                         break;
8044                 case NFT_MSG_NEWOBJ:
8045                         if (nft_trans_obj_update(trans)) {
8046                                 kfree(nft_trans_obj_newobj(trans));
8047                                 nft_trans_destroy(trans);
8048                         } else {
8049                                 trans->ctx.table->use--;
8050                                 nft_obj_del(nft_trans_obj(trans));
8051                         }
8052                         break;
8053                 case NFT_MSG_DELOBJ:
8054                         trans->ctx.table->use++;
8055                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
8056                         nft_trans_destroy(trans);
8057                         break;
8058                 case NFT_MSG_NEWFLOWTABLE:
8059                         if (nft_trans_flowtable_update(trans)) {
8060                                 nft_unregister_flowtable_net_hooks(net,
8061                                                 &nft_trans_flowtable_hooks(trans));
8062                         } else {
8063                                 trans->ctx.table->use--;
8064                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8065                                 nft_unregister_flowtable_net_hooks(net,
8066                                                 &nft_trans_flowtable(trans)->hook_list);
8067                         }
8068                         break;
8069                 case NFT_MSG_DELFLOWTABLE:
8070                         if (nft_trans_flowtable_update(trans)) {
8071                                 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8072                                         hook->inactive = false;
8073                         } else {
8074                                 trans->ctx.table->use++;
8075                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8076                         }
8077                         nft_trans_destroy(trans);
8078                         break;
8079                 }
8080         }
8081
8082         synchronize_rcu();
8083
8084         list_for_each_entry_safe_reverse(trans, next,
8085                                          &net->nft.commit_list, list) {
8086                 list_del(&trans->list);
8087                 nf_tables_abort_release(trans);
8088         }
8089
8090         if (autoload)
8091                 nf_tables_module_autoload(net);
8092         else
8093                 nf_tables_module_autoload_cleanup(net);
8094
8095         return 0;
8096 }
8097
8098 static void nf_tables_cleanup(struct net *net)
8099 {
8100         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8101 }
8102
8103 static int nf_tables_abort(struct net *net, struct sk_buff *skb, bool autoload)
8104 {
8105         int ret = __nf_tables_abort(net, autoload);
8106
8107         mutex_unlock(&net->nft.commit_mutex);
8108
8109         return ret;
8110 }
8111
8112 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8113 {
8114         bool genid_ok;
8115
8116         mutex_lock(&net->nft.commit_mutex);
8117
8118         genid_ok = genid == 0 || net->nft.base_seq == genid;
8119         if (!genid_ok)
8120                 mutex_unlock(&net->nft.commit_mutex);
8121
8122         /* else, commit mutex has to be released by commit or abort function */
8123         return genid_ok;
8124 }
8125
8126 static const struct nfnetlink_subsystem nf_tables_subsys = {
8127         .name           = "nf_tables",
8128         .subsys_id      = NFNL_SUBSYS_NFTABLES,
8129         .cb_count       = NFT_MSG_MAX,
8130         .cb             = nf_tables_cb,
8131         .commit         = nf_tables_commit,
8132         .abort          = nf_tables_abort,
8133         .cleanup        = nf_tables_cleanup,
8134         .valid_genid    = nf_tables_valid_genid,
8135         .owner          = THIS_MODULE,
8136 };
8137
8138 int nft_chain_validate_dependency(const struct nft_chain *chain,
8139                                   enum nft_chain_types type)
8140 {
8141         const struct nft_base_chain *basechain;
8142
8143         if (nft_is_base_chain(chain)) {
8144                 basechain = nft_base_chain(chain);
8145                 if (basechain->type->type != type)
8146                         return -EOPNOTSUPP;
8147         }
8148         return 0;
8149 }
8150 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8151
8152 int nft_chain_validate_hooks(const struct nft_chain *chain,
8153                              unsigned int hook_flags)
8154 {
8155         struct nft_base_chain *basechain;
8156
8157         if (nft_is_base_chain(chain)) {
8158                 basechain = nft_base_chain(chain);
8159
8160                 if ((1 << basechain->ops.hooknum) & hook_flags)
8161                         return 0;
8162
8163                 return -EOPNOTSUPP;
8164         }
8165
8166         return 0;
8167 }
8168 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8169
8170 /*
8171  * Loop detection - walk through the ruleset beginning at the destination chain
8172  * of a new jump until either the source chain is reached (loop) or all
8173  * reachable chains have been traversed.
8174  *
8175  * The loop check is performed whenever a new jump verdict is added to an
8176  * expression or verdict map or a verdict map is bound to a new chain.
8177  */
8178
8179 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8180                                  const struct nft_chain *chain);
8181
8182 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
8183                                         struct nft_set *set,
8184                                         const struct nft_set_iter *iter,
8185                                         struct nft_set_elem *elem)
8186 {
8187         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8188         const struct nft_data *data;
8189
8190         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8191             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
8192                 return 0;
8193
8194         data = nft_set_ext_data(ext);
8195         switch (data->verdict.code) {
8196         case NFT_JUMP:
8197         case NFT_GOTO:
8198                 return nf_tables_check_loops(ctx, data->verdict.chain);
8199         default:
8200                 return 0;
8201         }
8202 }
8203
8204 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8205                                  const struct nft_chain *chain)
8206 {
8207         const struct nft_rule *rule;
8208         const struct nft_expr *expr, *last;
8209         struct nft_set *set;
8210         struct nft_set_binding *binding;
8211         struct nft_set_iter iter;
8212
8213         if (ctx->chain == chain)
8214                 return -ELOOP;
8215
8216         list_for_each_entry(rule, &chain->rules, list) {
8217                 nft_rule_for_each_expr(expr, last, rule) {
8218                         struct nft_immediate_expr *priv;
8219                         const struct nft_data *data;
8220                         int err;
8221
8222                         if (strcmp(expr->ops->type->name, "immediate"))
8223                                 continue;
8224
8225                         priv = nft_expr_priv(expr);
8226                         if (priv->dreg != NFT_REG_VERDICT)
8227                                 continue;
8228
8229                         data = &priv->data;
8230                         switch (data->verdict.code) {
8231                         case NFT_JUMP:
8232                         case NFT_GOTO:
8233                                 err = nf_tables_check_loops(ctx,
8234                                                         data->verdict.chain);
8235                                 if (err < 0)
8236                                         return err;
8237                         default:
8238                                 break;
8239                         }
8240                 }
8241         }
8242
8243         list_for_each_entry(set, &ctx->table->sets, list) {
8244                 if (!nft_is_active_next(ctx->net, set))
8245                         continue;
8246                 if (!(set->flags & NFT_SET_MAP) ||
8247                     set->dtype != NFT_DATA_VERDICT)
8248                         continue;
8249
8250                 list_for_each_entry(binding, &set->bindings, list) {
8251                         if (!(binding->flags & NFT_SET_MAP) ||
8252                             binding->chain != chain)
8253                                 continue;
8254
8255                         iter.genmask    = nft_genmask_next(ctx->net);
8256                         iter.skip       = 0;
8257                         iter.count      = 0;
8258                         iter.err        = 0;
8259                         iter.fn         = nf_tables_loop_check_setelem;
8260
8261                         set->ops->walk(ctx, set, &iter);
8262                         if (iter.err < 0)
8263                                 return iter.err;
8264                 }
8265         }
8266
8267         return 0;
8268 }
8269
8270 /**
8271  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
8272  *
8273  *      @attr: netlink attribute to fetch value from
8274  *      @max: maximum value to be stored in dest
8275  *      @dest: pointer to the variable
8276  *
8277  *      Parse, check and store a given u32 netlink attribute into variable.
8278  *      This function returns -ERANGE if the value goes over maximum value.
8279  *      Otherwise a 0 is returned and the attribute value is stored in the
8280  *      destination variable.
8281  */
8282 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
8283 {
8284         u32 val;
8285
8286         val = ntohl(nla_get_be32(attr));
8287         if (val > max)
8288                 return -ERANGE;
8289
8290         *dest = val;
8291         return 0;
8292 }
8293 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8294
8295 /**
8296  *      nft_parse_register - parse a register value from a netlink attribute
8297  *
8298  *      @attr: netlink attribute
8299  *
8300  *      Parse and translate a register value from a netlink attribute.
8301  *      Registers used to be 128 bit wide, these register numbers will be
8302  *      mapped to the corresponding 32 bit register numbers.
8303  */
8304 unsigned int nft_parse_register(const struct nlattr *attr)
8305 {
8306         unsigned int reg;
8307
8308         reg = ntohl(nla_get_be32(attr));
8309         switch (reg) {
8310         case NFT_REG_VERDICT...NFT_REG_4:
8311                 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8312         default:
8313                 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8314         }
8315 }
8316 EXPORT_SYMBOL_GPL(nft_parse_register);
8317
8318 /**
8319  *      nft_dump_register - dump a register value to a netlink attribute
8320  *
8321  *      @skb: socket buffer
8322  *      @attr: attribute number
8323  *      @reg: register number
8324  *
8325  *      Construct a netlink attribute containing the register number. For
8326  *      compatibility reasons, register numbers being a multiple of 4 are
8327  *      translated to the corresponding 128 bit register numbers.
8328  */
8329 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8330 {
8331         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8332                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8333         else
8334                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8335
8336         return nla_put_be32(skb, attr, htonl(reg));
8337 }
8338 EXPORT_SYMBOL_GPL(nft_dump_register);
8339
8340 /**
8341  *      nft_validate_register_load - validate a load from a register
8342  *
8343  *      @reg: the register number
8344  *      @len: the length of the data
8345  *
8346  *      Validate that the input register is one of the general purpose
8347  *      registers and that the length of the load is within the bounds.
8348  */
8349 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
8350 {
8351         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8352                 return -EINVAL;
8353         if (len == 0)
8354                 return -EINVAL;
8355         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
8356                 return -ERANGE;
8357
8358         return 0;
8359 }
8360 EXPORT_SYMBOL_GPL(nft_validate_register_load);
8361
8362 /**
8363  *      nft_validate_register_store - validate an expressions' register store
8364  *
8365  *      @ctx: context of the expression performing the load
8366  *      @reg: the destination register number
8367  *      @data: the data to load
8368  *      @type: the data type
8369  *      @len: the length of the data
8370  *
8371  *      Validate that a data load uses the appropriate data type for
8372  *      the destination register and the length is within the bounds.
8373  *      A value of NULL for the data means that its runtime gathered
8374  *      data.
8375  */
8376 int nft_validate_register_store(const struct nft_ctx *ctx,
8377                                 enum nft_registers reg,
8378                                 const struct nft_data *data,
8379                                 enum nft_data_types type, unsigned int len)
8380 {
8381         int err;
8382
8383         switch (reg) {
8384         case NFT_REG_VERDICT:
8385                 if (type != NFT_DATA_VERDICT)
8386                         return -EINVAL;
8387
8388                 if (data != NULL &&
8389                     (data->verdict.code == NFT_GOTO ||
8390                      data->verdict.code == NFT_JUMP)) {
8391                         err = nf_tables_check_loops(ctx, data->verdict.chain);
8392                         if (err < 0)
8393                                 return err;
8394                 }
8395
8396                 return 0;
8397         default:
8398                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8399                         return -EINVAL;
8400                 if (len == 0)
8401                         return -EINVAL;
8402                 if (reg * NFT_REG32_SIZE + len >
8403                     sizeof_field(struct nft_regs, data))
8404                         return -ERANGE;
8405
8406                 if (data != NULL && type != NFT_DATA_VALUE)
8407                         return -EINVAL;
8408                 return 0;
8409         }
8410 }
8411 EXPORT_SYMBOL_GPL(nft_validate_register_store);
8412
8413 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8414         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
8415         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
8416                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
8417         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
8418 };
8419
8420 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8421                             struct nft_data_desc *desc, const struct nlattr *nla)
8422 {
8423         u8 genmask = nft_genmask_next(ctx->net);
8424         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8425         struct nft_chain *chain;
8426         int err;
8427
8428         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8429                                           nft_verdict_policy, NULL);
8430         if (err < 0)
8431                 return err;
8432
8433         if (!tb[NFTA_VERDICT_CODE])
8434                 return -EINVAL;
8435         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
8436
8437         switch (data->verdict.code) {
8438         default:
8439                 switch (data->verdict.code & NF_VERDICT_MASK) {
8440                 case NF_ACCEPT:
8441                 case NF_DROP:
8442                 case NF_QUEUE:
8443                         break;
8444                 default:
8445                         return -EINVAL;
8446                 }
8447                 fallthrough;
8448         case NFT_CONTINUE:
8449         case NFT_BREAK:
8450         case NFT_RETURN:
8451                 break;
8452         case NFT_JUMP:
8453         case NFT_GOTO:
8454                 if (tb[NFTA_VERDICT_CHAIN]) {
8455                         chain = nft_chain_lookup(ctx->net, ctx->table,
8456                                                  tb[NFTA_VERDICT_CHAIN],
8457                                                  genmask);
8458                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8459                         chain = nft_chain_lookup_byid(ctx->net,
8460                                                       tb[NFTA_VERDICT_CHAIN_ID]);
8461                         if (IS_ERR(chain))
8462                                 return PTR_ERR(chain);
8463                 } else {
8464                         return -EINVAL;
8465                 }
8466
8467                 if (IS_ERR(chain))
8468                         return PTR_ERR(chain);
8469                 if (nft_is_base_chain(chain))
8470                         return -EOPNOTSUPP;
8471
8472                 chain->use++;
8473                 data->verdict.chain = chain;
8474                 break;
8475         }
8476
8477         desc->len = sizeof(data->verdict);
8478         desc->type = NFT_DATA_VERDICT;
8479         return 0;
8480 }
8481
8482 static void nft_verdict_uninit(const struct nft_data *data)
8483 {
8484         struct nft_chain *chain;
8485         struct nft_rule *rule;
8486
8487         switch (data->verdict.code) {
8488         case NFT_JUMP:
8489         case NFT_GOTO:
8490                 chain = data->verdict.chain;
8491                 chain->use--;
8492
8493                 if (!nft_chain_is_bound(chain))
8494                         break;
8495
8496                 chain->table->use--;
8497                 list_for_each_entry(rule, &chain->rules, list)
8498                         chain->use--;
8499
8500                 nft_chain_del(chain);
8501                 break;
8502         }
8503 }
8504
8505 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
8506 {
8507         struct nlattr *nest;
8508
8509         nest = nla_nest_start_noflag(skb, type);
8510         if (!nest)
8511                 goto nla_put_failure;
8512
8513         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
8514                 goto nla_put_failure;
8515
8516         switch (v->code) {
8517         case NFT_JUMP:
8518         case NFT_GOTO:
8519                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
8520                                    v->chain->name))
8521                         goto nla_put_failure;
8522         }
8523         nla_nest_end(skb, nest);
8524         return 0;
8525
8526 nla_put_failure:
8527         return -1;
8528 }
8529
8530 static int nft_value_init(const struct nft_ctx *ctx,
8531                           struct nft_data *data, unsigned int size,
8532                           struct nft_data_desc *desc, const struct nlattr *nla)
8533 {
8534         unsigned int len;
8535
8536         len = nla_len(nla);
8537         if (len == 0)
8538                 return -EINVAL;
8539         if (len > size)
8540                 return -EOVERFLOW;
8541
8542         nla_memcpy(data->data, nla, len);
8543         desc->type = NFT_DATA_VALUE;
8544         desc->len  = len;
8545         return 0;
8546 }
8547
8548 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8549                           unsigned int len)
8550 {
8551         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8552 }
8553
8554 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
8555         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
8556         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
8557 };
8558
8559 /**
8560  *      nft_data_init - parse nf_tables data netlink attributes
8561  *
8562  *      @ctx: context of the expression using the data
8563  *      @data: destination struct nft_data
8564  *      @size: maximum data length
8565  *      @desc: data description
8566  *      @nla: netlink attribute containing data
8567  *
8568  *      Parse the netlink data attributes and initialize a struct nft_data.
8569  *      The type and length of data are returned in the data description.
8570  *
8571  *      The caller can indicate that it only wants to accept data of type
8572  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
8573  */
8574 int nft_data_init(const struct nft_ctx *ctx,
8575                   struct nft_data *data, unsigned int size,
8576                   struct nft_data_desc *desc, const struct nlattr *nla)
8577 {
8578         struct nlattr *tb[NFTA_DATA_MAX + 1];
8579         int err;
8580
8581         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8582                                           nft_data_policy, NULL);
8583         if (err < 0)
8584                 return err;
8585
8586         if (tb[NFTA_DATA_VALUE])
8587                 return nft_value_init(ctx, data, size, desc,
8588                                       tb[NFTA_DATA_VALUE]);
8589         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8590                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8591         return -EINVAL;
8592 }
8593 EXPORT_SYMBOL_GPL(nft_data_init);
8594
8595 /**
8596  *      nft_data_release - release a nft_data item
8597  *
8598  *      @data: struct nft_data to release
8599  *      @type: type of data
8600  *
8601  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8602  *      all others need to be released by calling this function.
8603  */
8604 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
8605 {
8606         if (type < NFT_DATA_VERDICT)
8607                 return;
8608         switch (type) {
8609         case NFT_DATA_VERDICT:
8610                 return nft_verdict_uninit(data);
8611         default:
8612                 WARN_ON(1);
8613         }
8614 }
8615 EXPORT_SYMBOL_GPL(nft_data_release);
8616
8617 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8618                   enum nft_data_types type, unsigned int len)
8619 {
8620         struct nlattr *nest;
8621         int err;
8622
8623         nest = nla_nest_start_noflag(skb, attr);
8624         if (nest == NULL)
8625                 return -1;
8626
8627         switch (type) {
8628         case NFT_DATA_VALUE:
8629                 err = nft_value_dump(skb, data, len);
8630                 break;
8631         case NFT_DATA_VERDICT:
8632                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
8633                 break;
8634         default:
8635                 err = -EINVAL;
8636                 WARN_ON(1);
8637         }
8638
8639         nla_nest_end(skb, nest);
8640         return err;
8641 }
8642 EXPORT_SYMBOL_GPL(nft_data_dump);
8643
8644 int __nft_release_basechain(struct nft_ctx *ctx)
8645 {
8646         struct nft_rule *rule, *nr;
8647
8648         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8649                 return 0;
8650
8651         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
8652         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
8653                 list_del(&rule->list);
8654                 ctx->chain->use--;
8655                 nf_tables_rule_release(ctx, rule);
8656         }
8657         nft_chain_del(ctx->chain);
8658         ctx->table->use--;
8659         nf_tables_chain_destroy(ctx);
8660
8661         return 0;
8662 }
8663 EXPORT_SYMBOL_GPL(__nft_release_basechain);
8664
8665 static void __nft_release_tables(struct net *net)
8666 {
8667         struct nft_flowtable *flowtable, *nf;
8668         struct nft_table *table, *nt;
8669         struct nft_chain *chain, *nc;
8670         struct nft_object *obj, *ne;
8671         struct nft_rule *rule, *nr;
8672         struct nft_set *set, *ns;
8673         struct nft_ctx ctx = {
8674                 .net    = net,
8675                 .family = NFPROTO_NETDEV,
8676         };
8677
8678         list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
8679                 ctx.family = table->family;
8680
8681                 list_for_each_entry(chain, &table->chains, list)
8682                         nf_tables_unregister_hook(net, table, chain);
8683                 /* No packets are walking on these chains anymore. */
8684                 ctx.table = table;
8685                 list_for_each_entry(chain, &table->chains, list) {
8686                         ctx.chain = chain;
8687                         list_for_each_entry_safe(rule, nr, &chain->rules, list) {
8688                                 list_del(&rule->list);
8689                                 chain->use--;
8690                                 nf_tables_rule_release(&ctx, rule);
8691                         }
8692                 }
8693                 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
8694                         list_del(&flowtable->list);
8695                         table->use--;
8696                         nf_tables_flowtable_destroy(flowtable);
8697                 }
8698                 list_for_each_entry_safe(set, ns, &table->sets, list) {
8699                         list_del(&set->list);
8700                         table->use--;
8701                         nft_set_destroy(&ctx, set);
8702                 }
8703                 list_for_each_entry_safe(obj, ne, &table->objects, list) {
8704                         nft_obj_del(obj);
8705                         table->use--;
8706                         nft_obj_destroy(&ctx, obj);
8707                 }
8708                 list_for_each_entry_safe(chain, nc, &table->chains, list) {
8709                         ctx.chain = chain;
8710                         nft_chain_del(chain);
8711                         table->use--;
8712                         nf_tables_chain_destroy(&ctx);
8713                 }
8714                 list_del(&table->list);
8715                 nf_tables_table_destroy(&ctx);
8716         }
8717 }
8718
8719 static int __net_init nf_tables_init_net(struct net *net)
8720 {
8721         INIT_LIST_HEAD(&net->nft.tables);
8722         INIT_LIST_HEAD(&net->nft.commit_list);
8723         INIT_LIST_HEAD(&net->nft.module_list);
8724         mutex_init(&net->nft.commit_mutex);
8725         net->nft.base_seq = 1;
8726         net->nft.validate_state = NFT_VALIDATE_SKIP;
8727
8728         return 0;
8729 }
8730
8731 static void __net_exit nf_tables_exit_net(struct net *net)
8732 {
8733         mutex_lock(&net->nft.commit_mutex);
8734         if (!list_empty(&net->nft.commit_list))
8735                 __nf_tables_abort(net, false);
8736         __nft_release_tables(net);
8737         mutex_unlock(&net->nft.commit_mutex);
8738         WARN_ON_ONCE(!list_empty(&net->nft.tables));
8739         WARN_ON_ONCE(!list_empty(&net->nft.module_list));
8740 }
8741
8742 static struct pernet_operations nf_tables_net_ops = {
8743         .init   = nf_tables_init_net,
8744         .exit   = nf_tables_exit_net,
8745 };
8746
8747 static int __init nf_tables_module_init(void)
8748 {
8749         int err;
8750
8751         spin_lock_init(&nf_tables_destroy_list_lock);
8752         err = register_pernet_subsys(&nf_tables_net_ops);
8753         if (err < 0)
8754                 return err;
8755
8756         err = nft_chain_filter_init();
8757         if (err < 0)
8758                 goto err1;
8759
8760         err = nf_tables_core_module_init();
8761         if (err < 0)
8762                 goto err2;
8763
8764         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
8765         if (err < 0)
8766                 goto err3;
8767
8768         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
8769         if (err < 0)
8770                 goto err4;
8771
8772         err = nft_offload_init();
8773         if (err < 0)
8774                 goto err5;
8775
8776         /* must be last */
8777         err = nfnetlink_subsys_register(&nf_tables_subsys);
8778         if (err < 0)
8779                 goto err6;
8780
8781         nft_chain_route_init();
8782
8783         return err;
8784 err6:
8785         nft_offload_exit();
8786 err5:
8787         rhltable_destroy(&nft_objname_ht);
8788 err4:
8789         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8790 err3:
8791         nf_tables_core_module_exit();
8792 err2:
8793         nft_chain_filter_fini();
8794 err1:
8795         unregister_pernet_subsys(&nf_tables_net_ops);
8796         return err;
8797 }
8798
8799 static void __exit nf_tables_module_exit(void)
8800 {
8801         nfnetlink_subsys_unregister(&nf_tables_subsys);
8802         nft_offload_exit();
8803         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8804         nft_chain_filter_fini();
8805         nft_chain_route_fini();
8806         unregister_pernet_subsys(&nf_tables_net_ops);
8807         cancel_work_sync(&trans_destroy_work);
8808         rcu_barrier();
8809         rhltable_destroy(&nft_objname_ht);
8810         nf_tables_core_module_exit();
8811 }
8812
8813 module_init(nf_tables_module_init);
8814 module_exit(nf_tables_module_exit);
8815
8816 MODULE_LICENSE("GPL");
8817 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
8818 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);