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 (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 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 (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 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 (nft_expr_more(rule, expr)) {
 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 (nft_expr_more(rule, expr)) {
 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         if (debug_locks)
 623                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 624 #endif
 625 }
 626
 627 static const struct nft_chain_type *
 628 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 629                             u8 family, bool autoload)
 630 {
 631         const struct nft_chain_type *type;
 632
 633         type = __nf_tables_chain_type_lookup(nla, family);
 634         if (type != NULL)
 635                 return type;
 636
 637         lockdep_nfnl_nft_mutex_not_held();
 638 #ifdef CONFIG_MODULES
 639         if (autoload) {
 640                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 641                                        nla_len(nla),
 642                                        (const char *)nla_data(nla)) == -EAGAIN)
 643                         return ERR_PTR(-EAGAIN);
 644         }
 645 #endif
 646         return ERR_PTR(-ENOENT);
 647 }
 648
 649 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 650         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 651                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 652         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 653         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 654         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 655                                     .len = NFT_USERDATA_MAXLEN }
 656 };
 657
 658 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 659                                      u32 portid, u32 seq, int event, u32 flags,
 660                                      int family, const struct nft_table *table)
 661 {
 662         struct nlmsghdr *nlh;
 663         struct nfgenmsg *nfmsg;
 664
 665         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 666         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
 667         if (nlh == NULL)
 668                 goto nla_put_failure;
 669
 670         nfmsg = nlmsg_data(nlh);
 671         nfmsg->nfgen_family     = family;
 672         nfmsg->version          = NFNETLINK_V0;
 673         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
 674
 675         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 676             nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
 677             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 678             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 679                          NFTA_TABLE_PAD))
 680                 goto nla_put_failure;
 681
 682         if (table->udata) {
 683                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 684                         goto nla_put_failure;
 685         }
 686
 687         nlmsg_end(skb, nlh);
 688         return 0;
 689
 690 nla_put_failure:
 691         nlmsg_trim(skb, nlh);
 692         return -1;
 693 }
 694
 695 struct nftnl_skb_parms {
 696         bool report;
 697 };
 698 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 699
 700 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 701                                struct list_head *notify_list)
 702 {
 703         NFT_CB(skb).report = report;
 704         list_add_tail(&skb->list, notify_list);
 705 }
 706
 707 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 708 {
 709         struct sk_buff *skb;
 710         int err;
 711         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
 712                               ctx->table->name, ctx->table->handle);
 713
 714         audit_log_nfcfg(buf,
 715                         ctx->family,
 716                         ctx->table->use,
 717                         event == NFT_MSG_NEWTABLE ?
 718                                 AUDIT_NFT_OP_TABLE_REGISTER :
 719                                 AUDIT_NFT_OP_TABLE_UNREGISTER,
 720                         GFP_KERNEL);
 721         kfree(buf);
 722
 723         if (!ctx->report &&
 724             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 725                 return;
 726
 727         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 728         if (skb == NULL)
 729                 goto err;
 730
 731         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 732                                         event, 0, ctx->family, ctx->table);
 733         if (err < 0) {
 734                 kfree_skb(skb);
 735                 goto err;
 736         }
 737
 738         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
 739         return;
 740 err:
 741         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 742 }
 743
 744 static int nf_tables_dump_tables(struct sk_buff *skb,
 745                                  struct netlink_callback *cb)
 746 {
 747         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 748         const struct nft_table *table;
 749         unsigned int idx = 0, s_idx = cb->args[0];
 750         struct net *net = sock_net(skb->sk);
 751         int family = nfmsg->nfgen_family;
 752
 753         rcu_read_lock();
 754         cb->seq = net->nft.base_seq;
 755
 756         list_for_each_entry_rcu(table, &net->nft.tables, list) {
 757                 if (family != NFPROTO_UNSPEC && family != table->family)
 758                         continue;
 759
 760                 if (idx < s_idx)
 761                         goto cont;
 762                 if (idx > s_idx)
 763                         memset(&cb->args[1], 0,
 764                                sizeof(cb->args) - sizeof(cb->args[0]));
 765                 if (!nft_is_active(net, table))
 766                         continue;
 767                 if (nf_tables_fill_table_info(skb, net,
 768                                               NETLINK_CB(cb->skb).portid,
 769                                               cb->nlh->nlmsg_seq,
 770                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 771                                               table->family, table) < 0)
 772                         goto done;
 773
 774                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 775 cont:
 776                 idx++;
 777         }
 778 done:
 779         rcu_read_unlock();
 780         cb->args[0] = idx;
 781         return skb->len;
 782 }
 783
 784 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 785                                       const struct nlmsghdr *nlh,
 786                                       struct netlink_dump_control *c)
 787 {
 788         int err;
 789
 790         if (!try_module_get(THIS_MODULE))
 791                 return -EINVAL;
 792
 793         rcu_read_unlock();
 794         err = netlink_dump_start(nlsk, skb, nlh, c);
 795         rcu_read_lock();
 796         module_put(THIS_MODULE);
 797
 798         return err;
 799 }
 800
 801 /* called with rcu_read_lock held */
 802 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
 803                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 804                               const struct nlattr * const nla[],
 805                               struct netlink_ext_ack *extack)
 806 {
 807         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 808         u8 genmask = nft_genmask_cur(net);
 809         const struct nft_table *table;
 810         struct sk_buff *skb2;
 811         int family = nfmsg->nfgen_family;
 812         int err;
 813
 814         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 815                 struct netlink_dump_control c = {
 816                         .dump = nf_tables_dump_tables,
 817                         .module = THIS_MODULE,
 818                 };
 819
 820                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
 821         }
 822
 823         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
 824         if (IS_ERR(table)) {
 825                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 826                 return PTR_ERR(table);
 827         }
 828
 829         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 830         if (!skb2)
 831                 return -ENOMEM;
 832
 833         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 834                                         nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
 835                                         family, table);
 836         if (err < 0)
 837                 goto err_fill_table_info;
 838
 839         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 840
 841 err_fill_table_info:
 842         kfree_skb(skb2);
 843         return err;
 844 }
 845
 846 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 847 {
 848         struct nft_chain *chain;
 849         u32 i = 0;
 850
 851         list_for_each_entry(chain, &table->chains, list) {
 852                 if (!nft_is_active_next(net, chain))
 853                         continue;
 854                 if (!nft_is_base_chain(chain))
 855                         continue;
 856
 857                 if (cnt && i++ == cnt)
 858                         break;
 859
 860                 nf_tables_unregister_hook(net, table, chain);
 861         }
 862 }
 863
 864 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 865 {
 866         struct nft_chain *chain;
 867         int err, i = 0;
 868
 869         list_for_each_entry(chain, &table->chains, list) {
 870                 if (!nft_is_active_next(net, chain))
 871                         continue;
 872                 if (!nft_is_base_chain(chain))
 873                         continue;
 874
 875                 err = nf_tables_register_hook(net, table, chain);
 876                 if (err < 0)
 877                         goto err_register_hooks;
 878
 879                 i++;
 880         }
 881         return 0;
 882
 883 err_register_hooks:
 884         if (i)
 885                 nft_table_disable(net, table, i);
 886         return err;
 887 }
 888
 889 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 890 {
 891         nft_table_disable(net, table, 0);
 892 }
 893
 894 static int nf_tables_updtable(struct nft_ctx *ctx)
 895 {
 896         struct nft_trans *trans;
 897         u32 flags;
 898         int ret = 0;
 899
 900         if (!ctx->nla[NFTA_TABLE_FLAGS])
 901                 return 0;
 902
 903         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
 904         if (flags & ~NFT_TABLE_F_DORMANT)
 905                 return -EINVAL;
 906
 907         if (flags == ctx->table->flags)
 908                 return 0;
 909
 910         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
 911                                 sizeof(struct nft_trans_table));
 912         if (trans == NULL)
 913                 return -ENOMEM;
 914
 915         if ((flags & NFT_TABLE_F_DORMANT) &&
 916             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
 917                 nft_trans_table_enable(trans) = false;
 918         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
 919                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
 920                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
 921                 ret = nf_tables_table_enable(ctx->net, ctx->table);
 922                 if (ret >= 0)
 923                         nft_trans_table_enable(trans) = true;
 924                 else
 925                         ctx->table->flags |= NFT_TABLE_F_DORMANT;
 926         }
 927         if (ret < 0)
 928                 goto err;
 929
 930         nft_trans_table_update(trans) = true;
 931         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 932         return 0;
 933 err:
 934         nft_trans_destroy(trans);
 935         return ret;
 936 }
 937
 938 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
 939 {
 940         const char *name = data;
 941
 942         return jhash(name, strlen(name), seed);
 943 }
 944
 945 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
 946 {
 947         const struct nft_chain *chain = data;
 948
 949         return nft_chain_hash(chain->name, 0, seed);
 950 }
 951
 952 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
 953                               const void *ptr)
 954 {
 955         const struct nft_chain *chain = ptr;
 956         const char *name = arg->key;
 957
 958         return strcmp(chain->name, name);
 959 }
 960
 961 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
 962 {
 963         const struct nft_object_hash_key *k = data;
 964
 965         seed ^= hash_ptr(k->table, 32);
 966
 967         return jhash(k->name, strlen(k->name), seed);
 968 }
 969
 970 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
 971 {
 972         const struct nft_object *obj = data;
 973
 974         return nft_objname_hash(&obj->key, 0, seed);
 975 }
 976
 977 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
 978                                 const void *ptr)
 979 {
 980         const struct nft_object_hash_key *k = arg->key;
 981         const struct nft_object *obj = ptr;
 982
 983         if (obj->key.table != k->table)
 984                 return -1;
 985
 986         return strcmp(obj->key.name, k->name);
 987 }
 988
 989 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
 990                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 991                               const struct nlattr * const nla[],
 992                               struct netlink_ext_ack *extack)
 993 {
 994         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 995         u8 genmask = nft_genmask_next(net);
 996         int family = nfmsg->nfgen_family;
 997         const struct nlattr *attr;
 998         struct nft_table *table;
 999         struct nft_ctx ctx;
1000         u32 flags = 0;
1001         int err;
1002
1003         lockdep_assert_held(&net->nft.commit_mutex);
1004         attr = nla[NFTA_TABLE_NAME];
1005         table = nft_table_lookup(net, attr, family, genmask);
1006         if (IS_ERR(table)) {
1007                 if (PTR_ERR(table) != -ENOENT)
1008                         return PTR_ERR(table);
1009         } else {
1010                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1011                         NL_SET_BAD_ATTR(extack, attr);
1012                         return -EEXIST;
1013                 }
1014                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1015                         return -EOPNOTSUPP;
1016
1017                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1018                 return nf_tables_updtable(&ctx);
1019         }
1020
1021         if (nla[NFTA_TABLE_FLAGS]) {
1022                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1023                 if (flags & ~NFT_TABLE_F_DORMANT)
1024                         return -EINVAL;
1025         }
1026
1027         err = -ENOMEM;
1028         table = kzalloc(sizeof(*table), GFP_KERNEL);
1029         if (table == NULL)
1030                 goto err_kzalloc;
1031
1032         table->name = nla_strdup(attr, GFP_KERNEL);
1033         if (table->name == NULL)
1034                 goto err_strdup;
1035
1036         if (nla[NFTA_TABLE_USERDATA]) {
1037                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1038                 if (table->udata == NULL)
1039                         goto err_table_udata;
1040
1041                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1042         }
1043
1044         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1045         if (err)
1046                 goto err_chain_ht;
1047
1048         INIT_LIST_HEAD(&table->chains);
1049         INIT_LIST_HEAD(&table->sets);
1050         INIT_LIST_HEAD(&table->objects);
1051         INIT_LIST_HEAD(&table->flowtables);
1052         table->family = family;
1053         table->flags = flags;
1054         table->handle = ++table_handle;
1055
1056         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1057         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1058         if (err < 0)
1059                 goto err_trans;
1060
1061         list_add_tail_rcu(&table->list, &net->nft.tables);
1062         return 0;
1063 err_trans:
1064         rhltable_destroy(&table->chains_ht);
1065 err_chain_ht:
1066         kfree(table->udata);
1067 err_table_udata:
1068         kfree(table->name);
1069 err_strdup:
1070         kfree(table);
1071 err_kzalloc:
1072         return err;
1073 }
1074
1075 static int nft_flush_table(struct nft_ctx *ctx)
1076 {
1077         struct nft_flowtable *flowtable, *nft;
1078         struct nft_chain *chain, *nc;
1079         struct nft_object *obj, *ne;
1080         struct nft_set *set, *ns;
1081         int err;
1082
1083         list_for_each_entry(chain, &ctx->table->chains, list) {
1084                 if (!nft_is_active_next(ctx->net, chain))
1085                         continue;
1086
1087                 if (nft_chain_is_bound(chain))
1088                         continue;
1089
1090                 ctx->chain = chain;
1091
1092                 err = nft_delrule_by_chain(ctx);
1093                 if (err < 0)
1094                         goto out;
1095         }
1096
1097         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1098                 if (!nft_is_active_next(ctx->net, set))
1099                         continue;
1100
1101                 if (nft_set_is_anonymous(set) &&
1102                     !list_empty(&set->bindings))
1103                         continue;
1104
1105                 err = nft_delset(ctx, set);
1106                 if (err < 0)
1107                         goto out;
1108         }
1109
1110         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1111                 if (!nft_is_active_next(ctx->net, flowtable))
1112                         continue;
1113
1114                 err = nft_delflowtable(ctx, flowtable);
1115                 if (err < 0)
1116                         goto out;
1117         }
1118
1119         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1120                 if (!nft_is_active_next(ctx->net, obj))
1121                         continue;
1122
1123                 err = nft_delobj(ctx, obj);
1124                 if (err < 0)
1125                         goto out;
1126         }
1127
1128         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1129                 if (!nft_is_active_next(ctx->net, chain))
1130                         continue;
1131
1132                 if (nft_chain_is_bound(chain))
1133                         continue;
1134
1135                 ctx->chain = chain;
1136
1137                 err = nft_delchain(ctx);
1138                 if (err < 0)
1139                         goto out;
1140         }
1141
1142         err = nft_deltable(ctx);
1143 out:
1144         return err;
1145 }
1146
1147 static int nft_flush(struct nft_ctx *ctx, int family)
1148 {
1149         struct nft_table *table, *nt;
1150         const struct nlattr * const *nla = ctx->nla;
1151         int err = 0;
1152
1153         list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1154                 if (family != AF_UNSPEC && table->family != family)
1155                         continue;
1156
1157                 ctx->family = table->family;
1158
1159                 if (!nft_is_active_next(ctx->net, table))
1160                         continue;
1161
1162                 if (nla[NFTA_TABLE_NAME] &&
1163                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1164                         continue;
1165
1166                 ctx->table = table;
1167
1168                 err = nft_flush_table(ctx);
1169                 if (err < 0)
1170                         goto out;
1171         }
1172 out:
1173         return err;
1174 }
1175
1176 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1177                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1178                               const struct nlattr * const nla[],
1179                               struct netlink_ext_ack *extack)
1180 {
1181         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1182         u8 genmask = nft_genmask_next(net);
1183         int family = nfmsg->nfgen_family;
1184         const struct nlattr *attr;
1185         struct nft_table *table;
1186         struct nft_ctx ctx;
1187
1188         nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1189         if (family == AF_UNSPEC ||
1190             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1191                 return nft_flush(&ctx, family);
1192
1193         if (nla[NFTA_TABLE_HANDLE]) {
1194                 attr = nla[NFTA_TABLE_HANDLE];
1195                 table = nft_table_lookup_byhandle(net, attr, genmask);
1196         } else {
1197                 attr = nla[NFTA_TABLE_NAME];
1198                 table = nft_table_lookup(net, attr, family, genmask);
1199         }
1200
1201         if (IS_ERR(table)) {
1202                 NL_SET_BAD_ATTR(extack, attr);
1203                 return PTR_ERR(table);
1204         }
1205
1206         if (nlh->nlmsg_flags & NLM_F_NONREC &&
1207             table->use > 0)
1208                 return -EBUSY;
1209
1210         ctx.family = family;
1211         ctx.table = table;
1212
1213         return nft_flush_table(&ctx);
1214 }
1215
1216 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1217 {
1218         if (WARN_ON(ctx->table->use > 0))
1219                 return;
1220
1221         rhltable_destroy(&ctx->table->chains_ht);
1222         kfree(ctx->table->name);
1223         kfree(ctx->table->udata);
1224         kfree(ctx->table);
1225 }
1226
1227 void nft_register_chain_type(const struct nft_chain_type *ctype)
1228 {
1229         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1230         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1231                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1232                 return;
1233         }
1234         chain_type[ctype->family][ctype->type] = ctype;
1235         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1236 }
1237 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1238
1239 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1240 {
1241         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1242         chain_type[ctype->family][ctype->type] = NULL;
1243         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1244 }
1245 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1246
1247 /*
1248  * Chains
1249  */
1250
1251 static struct nft_chain *
1252 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1253 {
1254         struct nft_chain *chain;
1255
1256         list_for_each_entry(chain, &table->chains, list) {
1257                 if (chain->handle == handle &&
1258                     nft_active_genmask(chain, genmask))
1259                         return chain;
1260         }
1261
1262         return ERR_PTR(-ENOENT);
1263 }
1264
1265 static bool lockdep_commit_lock_is_held(const struct net *net)
1266 {
1267 #ifdef CONFIG_PROVE_LOCKING
1268         return lockdep_is_held(&net->nft.commit_mutex);
1269 #else
1270         return true;
1271 #endif
1272 }
1273
1274 static struct nft_chain *nft_chain_lookup(struct net *net,
1275                                           struct nft_table *table,
1276                                           const struct nlattr *nla, u8 genmask)
1277 {
1278         char search[NFT_CHAIN_MAXNAMELEN + 1];
1279         struct rhlist_head *tmp, *list;
1280         struct nft_chain *chain;
1281
1282         if (nla == NULL)
1283                 return ERR_PTR(-EINVAL);
1284
1285         nla_strlcpy(search, nla, sizeof(search));
1286
1287         WARN_ON(!rcu_read_lock_held() &&
1288                 !lockdep_commit_lock_is_held(net));
1289
1290         chain = ERR_PTR(-ENOENT);
1291         rcu_read_lock();
1292         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1293         if (!list)
1294                 goto out_unlock;
1295
1296         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1297                 if (nft_active_genmask(chain, genmask))
1298                         goto out_unlock;
1299         }
1300         chain = ERR_PTR(-ENOENT);
1301 out_unlock:
1302         rcu_read_unlock();
1303         return chain;
1304 }
1305
1306 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1307         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1308                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1309         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1310         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1311                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1312         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1313         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1314         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1315                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1316         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1317         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1318         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1319         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1320                                     .len = NFT_USERDATA_MAXLEN },
1321 };
1322
1323 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1324         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1325         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1326         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1327                                     .len = IFNAMSIZ - 1 },
1328 };
1329
1330 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1331 {
1332         struct nft_stats *cpu_stats, total;
1333         struct nlattr *nest;
1334         unsigned int seq;
1335         u64 pkts, bytes;
1336         int cpu;
1337
1338         if (!stats)
1339                 return 0;
1340
1341         memset(&total, 0, sizeof(total));
1342         for_each_possible_cpu(cpu) {
1343                 cpu_stats = per_cpu_ptr(stats, cpu);
1344                 do {
1345                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1346                         pkts = cpu_stats->pkts;
1347                         bytes = cpu_stats->bytes;
1348                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1349                 total.pkts += pkts;
1350                 total.bytes += bytes;
1351         }
1352         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1353         if (nest == NULL)
1354                 goto nla_put_failure;
1355
1356         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1357                          NFTA_COUNTER_PAD) ||
1358             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1359                          NFTA_COUNTER_PAD))
1360                 goto nla_put_failure;
1361
1362         nla_nest_end(skb, nest);
1363         return 0;
1364
1365 nla_put_failure:
1366         return -ENOSPC;
1367 }
1368
1369 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1370                                    const struct nft_base_chain *basechain)
1371 {
1372         const struct nf_hook_ops *ops = &basechain->ops;
1373         struct nft_hook *hook, *first = NULL;
1374         struct nlattr *nest, *nest_devs;
1375         int n = 0;
1376
1377         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1378         if (nest == NULL)
1379                 goto nla_put_failure;
1380         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1381                 goto nla_put_failure;
1382         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1383                 goto nla_put_failure;
1384
1385         if (nft_base_chain_netdev(family, ops->hooknum)) {
1386                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1387                 list_for_each_entry(hook, &basechain->hook_list, list) {
1388                         if (!first)
1389                                 first = hook;
1390
1391                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1392                                            hook->ops.dev->name))
1393                                 goto nla_put_failure;
1394                         n++;
1395                 }
1396                 nla_nest_end(skb, nest_devs);
1397
1398                 if (n == 1 &&
1399                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1400                         goto nla_put_failure;
1401         }
1402         nla_nest_end(skb, nest);
1403
1404         return 0;
1405 nla_put_failure:
1406         return -1;
1407 }
1408
1409 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1410                                      u32 portid, u32 seq, int event, u32 flags,
1411                                      int family, const struct nft_table *table,
1412                                      const struct nft_chain *chain)
1413 {
1414         struct nlmsghdr *nlh;
1415         struct nfgenmsg *nfmsg;
1416
1417         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1418         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1419         if (nlh == NULL)
1420                 goto nla_put_failure;
1421
1422         nfmsg = nlmsg_data(nlh);
1423         nfmsg->nfgen_family     = family;
1424         nfmsg->version          = NFNETLINK_V0;
1425         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
1426
1427         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1428                 goto nla_put_failure;
1429         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1430                          NFTA_CHAIN_PAD))
1431                 goto nla_put_failure;
1432         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1433                 goto nla_put_failure;
1434
1435         if (nft_is_base_chain(chain)) {
1436                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1437                 struct nft_stats __percpu *stats;
1438
1439                 if (nft_dump_basechain_hook(skb, family, basechain))
1440                         goto nla_put_failure;
1441
1442                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1443                                  htonl(basechain->policy)))
1444                         goto nla_put_failure;
1445
1446                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1447                         goto nla_put_failure;
1448
1449                 stats = rcu_dereference_check(basechain->stats,
1450                                               lockdep_commit_lock_is_held(net));
1451                 if (nft_dump_stats(skb, stats))
1452                         goto nla_put_failure;
1453         }
1454
1455         if (chain->flags &&
1456             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1457                 goto nla_put_failure;
1458
1459         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1460                 goto nla_put_failure;
1461
1462         if (chain->udata &&
1463             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1464                 goto nla_put_failure;
1465
1466         nlmsg_end(skb, nlh);
1467         return 0;
1468
1469 nla_put_failure:
1470         nlmsg_trim(skb, nlh);
1471         return -1;
1472 }
1473
1474 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1475 {
1476         struct sk_buff *skb;
1477         int err;
1478         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
1479                               ctx->table->name, ctx->table->handle,
1480                               ctx->chain->name, ctx->chain->handle);
1481
1482         audit_log_nfcfg(buf,
1483                         ctx->family,
1484                         ctx->chain->use,
1485                         event == NFT_MSG_NEWCHAIN ?
1486                                 AUDIT_NFT_OP_CHAIN_REGISTER :
1487                                 AUDIT_NFT_OP_CHAIN_UNREGISTER,
1488                         GFP_KERNEL);
1489         kfree(buf);
1490
1491         if (!ctx->report &&
1492             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1493                 return;
1494
1495         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1496         if (skb == NULL)
1497                 goto err;
1498
1499         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1500                                         event, 0, ctx->family, ctx->table,
1501                                         ctx->chain);
1502         if (err < 0) {
1503                 kfree_skb(skb);
1504                 goto err;
1505         }
1506
1507         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
1508         return;
1509 err:
1510         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1511 }
1512
1513 static int nf_tables_dump_chains(struct sk_buff *skb,
1514                                  struct netlink_callback *cb)
1515 {
1516         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1517         const struct nft_table *table;
1518         const struct nft_chain *chain;
1519         unsigned int idx = 0, s_idx = cb->args[0];
1520         struct net *net = sock_net(skb->sk);
1521         int family = nfmsg->nfgen_family;
1522
1523         rcu_read_lock();
1524         cb->seq = net->nft.base_seq;
1525
1526         list_for_each_entry_rcu(table, &net->nft.tables, list) {
1527                 if (family != NFPROTO_UNSPEC && family != table->family)
1528                         continue;
1529
1530                 list_for_each_entry_rcu(chain, &table->chains, list) {
1531                         if (idx < s_idx)
1532                                 goto cont;
1533                         if (idx > s_idx)
1534                                 memset(&cb->args[1], 0,
1535                                        sizeof(cb->args) - sizeof(cb->args[0]));
1536                         if (!nft_is_active(net, chain))
1537                                 continue;
1538                         if (nf_tables_fill_chain_info(skb, net,
1539                                                       NETLINK_CB(cb->skb).portid,
1540                                                       cb->nlh->nlmsg_seq,
1541                                                       NFT_MSG_NEWCHAIN,
1542                                                       NLM_F_MULTI,
1543                                                       table->family, table,
1544                                                       chain) < 0)
1545                                 goto done;
1546
1547                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1548 cont:
1549                         idx++;
1550                 }
1551         }
1552 done:
1553         rcu_read_unlock();
1554         cb->args[0] = idx;
1555         return skb->len;
1556 }
1557
1558 /* called with rcu_read_lock held */
1559 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1560                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1561                               const struct nlattr * const nla[],
1562                               struct netlink_ext_ack *extack)
1563 {
1564         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1565         u8 genmask = nft_genmask_cur(net);
1566         const struct nft_chain *chain;
1567         struct nft_table *table;
1568         struct sk_buff *skb2;
1569         int family = nfmsg->nfgen_family;
1570         int err;
1571
1572         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1573                 struct netlink_dump_control c = {
1574                         .dump = nf_tables_dump_chains,
1575                         .module = THIS_MODULE,
1576                 };
1577
1578                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1579         }
1580
1581         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1582         if (IS_ERR(table)) {
1583                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1584                 return PTR_ERR(table);
1585         }
1586
1587         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1588         if (IS_ERR(chain)) {
1589                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1590                 return PTR_ERR(chain);
1591         }
1592
1593         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1594         if (!skb2)
1595                 return -ENOMEM;
1596
1597         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1598                                         nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1599                                         family, table, chain);
1600         if (err < 0)
1601                 goto err_fill_chain_info;
1602
1603         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1604
1605 err_fill_chain_info:
1606         kfree_skb(skb2);
1607         return err;
1608 }
1609
1610 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1611         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1612         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1613 };
1614
1615 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1616 {
1617         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1618         struct nft_stats __percpu *newstats;
1619         struct nft_stats *stats;
1620         int err;
1621
1622         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1623                                           nft_counter_policy, NULL);
1624         if (err < 0)
1625                 return ERR_PTR(err);
1626
1627         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1628                 return ERR_PTR(-EINVAL);
1629
1630         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1631         if (newstats == NULL)
1632                 return ERR_PTR(-ENOMEM);
1633
1634         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1635          * are not exposed to userspace.
1636          */
1637         preempt_disable();
1638         stats = this_cpu_ptr(newstats);
1639         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1640         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1641         preempt_enable();
1642
1643         return newstats;
1644 }
1645
1646 static void nft_chain_stats_replace(struct nft_trans *trans)
1647 {
1648         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1649
1650         if (!nft_trans_chain_stats(trans))
1651                 return;
1652
1653         nft_trans_chain_stats(trans) =
1654                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1655                                     lockdep_commit_lock_is_held(trans->ctx.net));
1656
1657         if (!nft_trans_chain_stats(trans))
1658                 static_branch_inc(&nft_counters_enabled);
1659 }
1660
1661 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1662 {
1663         struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1664         struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1665
1666         if (g0 != g1)
1667                 kvfree(g1);
1668         kvfree(g0);
1669
1670         /* should be NULL either via abort or via successful commit */
1671         WARN_ON_ONCE(chain->rules_next);
1672         kvfree(chain->rules_next);
1673 }
1674
1675 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1676 {
1677         struct nft_chain *chain = ctx->chain;
1678         struct nft_hook *hook, *next;
1679
1680         if (WARN_ON(chain->use > 0))
1681                 return;
1682
1683         /* no concurrent access possible anymore */
1684         nf_tables_chain_free_chain_rules(chain);
1685
1686         if (nft_is_base_chain(chain)) {
1687                 struct nft_base_chain *basechain = nft_base_chain(chain);
1688
1689                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1690                         list_for_each_entry_safe(hook, next,
1691                                                  &basechain->hook_list, list) {
1692                                 list_del_rcu(&hook->list);
1693                                 kfree_rcu(hook, rcu);
1694                         }
1695                 }
1696                 module_put(basechain->type->owner);
1697                 if (rcu_access_pointer(basechain->stats)) {
1698                         static_branch_dec(&nft_counters_enabled);
1699                         free_percpu(rcu_dereference_raw(basechain->stats));
1700                 }
1701                 kfree(chain->name);
1702                 kfree(chain->udata);
1703                 kfree(basechain);
1704         } else {
1705                 kfree(chain->name);
1706                 kfree(chain->udata);
1707                 kfree(chain);
1708         }
1709 }
1710
1711 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1712                                               const struct nlattr *attr)
1713 {
1714         struct net_device *dev;
1715         char ifname[IFNAMSIZ];
1716         struct nft_hook *hook;
1717         int err;
1718
1719         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1720         if (!hook) {
1721                 err = -ENOMEM;
1722                 goto err_hook_alloc;
1723         }
1724
1725         nla_strlcpy(ifname, attr, IFNAMSIZ);
1726         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1727          * indirectly serializing all the other holders of the commit_mutex with
1728          * the rtnl_mutex.
1729          */
1730         dev = __dev_get_by_name(net, ifname);
1731         if (!dev) {
1732                 err = -ENOENT;
1733                 goto err_hook_dev;
1734         }
1735         hook->ops.dev = dev;
1736         hook->inactive = false;
1737
1738         return hook;
1739
1740 err_hook_dev:
1741         kfree(hook);
1742 err_hook_alloc:
1743         return ERR_PTR(err);
1744 }
1745
1746 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1747                                            const struct nft_hook *this)
1748 {
1749         struct nft_hook *hook;
1750
1751         list_for_each_entry(hook, hook_list, list) {
1752                 if (this->ops.dev == hook->ops.dev)
1753                         return hook;
1754         }
1755
1756         return NULL;
1757 }
1758
1759 static int nf_tables_parse_netdev_hooks(struct net *net,
1760                                         const struct nlattr *attr,
1761                                         struct list_head *hook_list)
1762 {
1763         struct nft_hook *hook, *next;
1764         const struct nlattr *tmp;
1765         int rem, n = 0, err;
1766
1767         nla_for_each_nested(tmp, attr, rem) {
1768                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1769                         err = -EINVAL;
1770                         goto err_hook;
1771                 }
1772
1773                 hook = nft_netdev_hook_alloc(net, tmp);
1774                 if (IS_ERR(hook)) {
1775                         err = PTR_ERR(hook);
1776                         goto err_hook;
1777                 }
1778                 if (nft_hook_list_find(hook_list, hook)) {
1779                         kfree(hook);
1780                         err = -EEXIST;
1781                         goto err_hook;
1782                 }
1783                 list_add_tail(&hook->list, hook_list);
1784                 n++;
1785
1786                 if (n == NFT_NETDEVICE_MAX) {
1787                         err = -EFBIG;
1788                         goto err_hook;
1789                 }
1790         }
1791
1792         return 0;
1793
1794 err_hook:
1795         list_for_each_entry_safe(hook, next, hook_list, list) {
1796                 list_del(&hook->list);
1797                 kfree(hook);
1798         }
1799         return err;
1800 }
1801
1802 struct nft_chain_hook {
1803         u32                             num;
1804         s32                             priority;
1805         const struct nft_chain_type     *type;
1806         struct list_head                list;
1807 };
1808
1809 static int nft_chain_parse_netdev(struct net *net,
1810                                   struct nlattr *tb[],
1811                                   struct list_head *hook_list)
1812 {
1813         struct nft_hook *hook;
1814         int err;
1815
1816         if (tb[NFTA_HOOK_DEV]) {
1817                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1818                 if (IS_ERR(hook))
1819                         return PTR_ERR(hook);
1820
1821                 list_add_tail(&hook->list, hook_list);
1822         } else if (tb[NFTA_HOOK_DEVS]) {
1823                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1824                                                    hook_list);
1825                 if (err < 0)
1826                         return err;
1827
1828                 if (list_empty(hook_list))
1829                         return -EINVAL;
1830         } else {
1831                 return -EINVAL;
1832         }
1833
1834         return 0;
1835 }
1836
1837 static int nft_chain_parse_hook(struct net *net,
1838                                 const struct nlattr * const nla[],
1839                                 struct nft_chain_hook *hook, u8 family,
1840                                 bool autoload)
1841 {
1842         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1843         const struct nft_chain_type *type;
1844         int err;
1845
1846         lockdep_assert_held(&net->nft.commit_mutex);
1847         lockdep_nfnl_nft_mutex_not_held();
1848
1849         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1850                                           nla[NFTA_CHAIN_HOOK],
1851                                           nft_hook_policy, NULL);
1852         if (err < 0)
1853                 return err;
1854
1855         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1856             ha[NFTA_HOOK_PRIORITY] == NULL)
1857                 return -EINVAL;
1858
1859         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1860         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1861
1862         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1863         if (!type)
1864                 return -EOPNOTSUPP;
1865
1866         if (nla[NFTA_CHAIN_TYPE]) {
1867                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1868                                                    family, autoload);
1869                 if (IS_ERR(type))
1870                         return PTR_ERR(type);
1871         }
1872         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1873                 return -EOPNOTSUPP;
1874
1875         if (type->type == NFT_CHAIN_T_NAT &&
1876             hook->priority <= NF_IP_PRI_CONNTRACK)
1877                 return -EOPNOTSUPP;
1878
1879         if (!try_module_get(type->owner))
1880                 return -ENOENT;
1881
1882         hook->type = type;
1883
1884         INIT_LIST_HEAD(&hook->list);
1885         if (nft_base_chain_netdev(family, hook->num)) {
1886                 err = nft_chain_parse_netdev(net, ha, &hook->list);
1887                 if (err < 0) {
1888                         module_put(type->owner);
1889                         return err;
1890                 }
1891         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1892                 module_put(type->owner);
1893                 return -EOPNOTSUPP;
1894         }
1895
1896         return 0;
1897 }
1898
1899 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1900 {
1901         struct nft_hook *h, *next;
1902
1903         list_for_each_entry_safe(h, next, &hook->list, list) {
1904                 list_del(&h->list);
1905                 kfree(h);
1906         }
1907         module_put(hook->type->owner);
1908 }
1909
1910 struct nft_rules_old {
1911         struct rcu_head h;
1912         struct nft_rule **start;
1913 };
1914
1915 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1916                                                      unsigned int alloc)
1917 {
1918         if (alloc > INT_MAX)
1919                 return NULL;
1920
1921         alloc += 1;     /* NULL, ends rules */
1922         if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1923                 return NULL;
1924
1925         alloc *= sizeof(struct nft_rule *);
1926         alloc += sizeof(struct nft_rules_old);
1927
1928         return kvmalloc(alloc, GFP_KERNEL);
1929 }
1930
1931 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1932                                     const struct nft_chain_hook *hook,
1933                                     struct nft_chain *chain)
1934 {
1935         ops->pf         = family;
1936         ops->hooknum    = hook->num;
1937         ops->priority   = hook->priority;
1938         ops->priv       = chain;
1939         ops->hook       = hook->type->hooks[ops->hooknum];
1940 }
1941
1942 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1943                               struct nft_chain_hook *hook, u32 flags)
1944 {
1945         struct nft_chain *chain;
1946         struct nft_hook *h;
1947
1948         basechain->type = hook->type;
1949         INIT_LIST_HEAD(&basechain->hook_list);
1950         chain = &basechain->chain;
1951
1952         if (nft_base_chain_netdev(family, hook->num)) {
1953                 list_splice_init(&hook->list, &basechain->hook_list);
1954                 list_for_each_entry(h, &basechain->hook_list, list)
1955                         nft_basechain_hook_init(&h->ops, family, hook, chain);
1956
1957                 basechain->ops.hooknum  = hook->num;
1958                 basechain->ops.priority = hook->priority;
1959         } else {
1960                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1961         }
1962
1963         chain->flags |= NFT_CHAIN_BASE | flags;
1964         basechain->policy = NF_ACCEPT;
1965         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1966             nft_chain_offload_priority(basechain) < 0)
1967                 return -EOPNOTSUPP;
1968
1969         flow_block_init(&basechain->flow_block);
1970
1971         return 0;
1972 }
1973
1974 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
1975 {
1976         int err;
1977
1978         err = rhltable_insert_key(&table->chains_ht, chain->name,
1979                                   &chain->rhlhead, nft_chain_ht_params);
1980         if (err)
1981                 return err;
1982
1983         list_add_tail_rcu(&chain->list, &table->chains);
1984
1985         return 0;
1986 }
1987
1988 static u64 chain_id;
1989
1990 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1991                               u8 policy, u32 flags)
1992 {
1993         const struct nlattr * const *nla = ctx->nla;
1994         struct nft_table *table = ctx->table;
1995         struct nft_base_chain *basechain;
1996         struct nft_stats __percpu *stats;
1997         struct net *net = ctx->net;
1998         char name[NFT_NAME_MAXLEN];
1999         struct nft_trans *trans;
2000         struct nft_chain *chain;
2001         struct nft_rule **rules;
2002         int err;
2003
2004         if (table->use == UINT_MAX)
2005                 return -EOVERFLOW;
2006
2007         if (nla[NFTA_CHAIN_HOOK]) {
2008                 struct nft_chain_hook hook;
2009
2010                 if (flags & NFT_CHAIN_BINDING)
2011                         return -EOPNOTSUPP;
2012
2013                 err = nft_chain_parse_hook(net, nla, &hook, family, true);
2014                 if (err < 0)
2015                         return err;
2016
2017                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2018                 if (basechain == NULL) {
2019                         nft_chain_release_hook(&hook);
2020                         return -ENOMEM;
2021                 }
2022                 chain = &basechain->chain;
2023
2024                 if (nla[NFTA_CHAIN_COUNTERS]) {
2025                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2026                         if (IS_ERR(stats)) {
2027                                 nft_chain_release_hook(&hook);
2028                                 kfree(basechain);
2029                                 return PTR_ERR(stats);
2030                         }
2031                         rcu_assign_pointer(basechain->stats, stats);
2032                         static_branch_inc(&nft_counters_enabled);
2033                 }
2034
2035                 err = nft_basechain_init(basechain, family, &hook, flags);
2036                 if (err < 0) {
2037                         nft_chain_release_hook(&hook);
2038                         kfree(basechain);
2039                         return err;
2040                 }
2041         } else {
2042                 if (flags & NFT_CHAIN_BASE)
2043                         return -EINVAL;
2044                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2045                         return -EOPNOTSUPP;
2046
2047                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2048                 if (chain == NULL)
2049                         return -ENOMEM;
2050
2051                 chain->flags = flags;
2052         }
2053         ctx->chain = chain;
2054
2055         INIT_LIST_HEAD(&chain->rules);
2056         chain->handle = nf_tables_alloc_handle(table);
2057         chain->table = table;
2058
2059         if (nla[NFTA_CHAIN_NAME]) {
2060                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2061         } else {
2062                 if (!(flags & NFT_CHAIN_BINDING)) {
2063                         err = -EINVAL;
2064                         goto err_destroy_chain;
2065                 }
2066
2067                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2068                 chain->name = kstrdup(name, GFP_KERNEL);
2069         }
2070
2071         if (!chain->name) {
2072                 err = -ENOMEM;
2073                 goto err_destroy_chain;
2074         }
2075
2076         if (nla[NFTA_CHAIN_USERDATA]) {
2077                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2078                 if (chain->udata == NULL) {
2079                         err = -ENOMEM;
2080                         goto err_destroy_chain;
2081                 }
2082                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2083         }
2084
2085         rules = nf_tables_chain_alloc_rules(chain, 0);
2086         if (!rules) {
2087                 err = -ENOMEM;
2088                 goto err_destroy_chain;
2089         }
2090
2091         *rules = NULL;
2092         rcu_assign_pointer(chain->rules_gen_0, rules);
2093         rcu_assign_pointer(chain->rules_gen_1, rules);
2094
2095         err = nf_tables_register_hook(net, table, chain);
2096         if (err < 0)
2097                 goto err_destroy_chain;
2098
2099         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2100         if (IS_ERR(trans)) {
2101                 err = PTR_ERR(trans);
2102                 goto err_unregister_hook;
2103         }
2104
2105         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2106         if (nft_is_base_chain(chain))
2107                 nft_trans_chain_policy(trans) = policy;
2108
2109         err = nft_chain_add(table, chain);
2110         if (err < 0) {
2111                 nft_trans_destroy(trans);
2112                 goto err_unregister_hook;
2113         }
2114
2115         table->use++;
2116
2117         return 0;
2118 err_unregister_hook:
2119         nf_tables_unregister_hook(net, table, chain);
2120 err_destroy_chain:
2121         nf_tables_chain_destroy(ctx);
2122
2123         return err;
2124 }
2125
2126 static bool nft_hook_list_equal(struct list_head *hook_list1,
2127                                 struct list_head *hook_list2)
2128 {
2129         struct nft_hook *hook;
2130         int n = 0, m = 0;
2131
2132         n = 0;
2133         list_for_each_entry(hook, hook_list2, list) {
2134                 if (!nft_hook_list_find(hook_list1, hook))
2135                         return false;
2136
2137                 n++;
2138         }
2139         list_for_each_entry(hook, hook_list1, list)
2140                 m++;
2141
2142         return n == m;
2143 }
2144
2145 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2146                               u32 flags, const struct nlattr *attr,
2147                               struct netlink_ext_ack *extack)
2148 {
2149         const struct nlattr * const *nla = ctx->nla;
2150         struct nft_table *table = ctx->table;
2151         struct nft_chain *chain = ctx->chain;
2152         struct nft_base_chain *basechain;
2153         struct nft_stats *stats = NULL;
2154         struct nft_chain_hook hook;
2155         struct nf_hook_ops *ops;
2156         struct nft_trans *trans;
2157         int err;
2158
2159         if (chain->flags ^ flags)
2160                 return -EOPNOTSUPP;
2161
2162         if (nla[NFTA_CHAIN_HOOK]) {
2163                 if (!nft_is_base_chain(chain)) {
2164                         NL_SET_BAD_ATTR(extack, attr);
2165                         return -EEXIST;
2166                 }
2167                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2168                                            false);
2169                 if (err < 0)
2170                         return err;
2171
2172                 basechain = nft_base_chain(chain);
2173                 if (basechain->type != hook.type) {
2174                         nft_chain_release_hook(&hook);
2175                         NL_SET_BAD_ATTR(extack, attr);
2176                         return -EEXIST;
2177                 }
2178
2179                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2180                         if (!nft_hook_list_equal(&basechain->hook_list,
2181                                                  &hook.list)) {
2182                                 nft_chain_release_hook(&hook);
2183                                 NL_SET_BAD_ATTR(extack, attr);
2184                                 return -EEXIST;
2185                         }
2186                 } else {
2187                         ops = &basechain->ops;
2188                         if (ops->hooknum != hook.num ||
2189                             ops->priority != hook.priority) {
2190                                 nft_chain_release_hook(&hook);
2191                                 NL_SET_BAD_ATTR(extack, attr);
2192                                 return -EEXIST;
2193                         }
2194                 }
2195                 nft_chain_release_hook(&hook);
2196         }
2197
2198         if (nla[NFTA_CHAIN_HANDLE] &&
2199             nla[NFTA_CHAIN_NAME]) {
2200                 struct nft_chain *chain2;
2201
2202                 chain2 = nft_chain_lookup(ctx->net, table,
2203                                           nla[NFTA_CHAIN_NAME], genmask);
2204                 if (!IS_ERR(chain2)) {
2205                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2206                         return -EEXIST;
2207                 }
2208         }
2209
2210         if (nla[NFTA_CHAIN_COUNTERS]) {
2211                 if (!nft_is_base_chain(chain))
2212                         return -EOPNOTSUPP;
2213
2214                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2215                 if (IS_ERR(stats))
2216                         return PTR_ERR(stats);
2217         }
2218
2219         err = -ENOMEM;
2220         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2221                                 sizeof(struct nft_trans_chain));
2222         if (trans == NULL)
2223                 goto err;
2224
2225         nft_trans_chain_stats(trans) = stats;
2226         nft_trans_chain_update(trans) = true;
2227
2228         if (nla[NFTA_CHAIN_POLICY])
2229                 nft_trans_chain_policy(trans) = policy;
2230         else
2231                 nft_trans_chain_policy(trans) = -1;
2232
2233         if (nla[NFTA_CHAIN_HANDLE] &&
2234             nla[NFTA_CHAIN_NAME]) {
2235                 struct nft_trans *tmp;
2236                 char *name;
2237
2238                 err = -ENOMEM;
2239                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2240                 if (!name)
2241                         goto err;
2242
2243                 err = -EEXIST;
2244                 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2245                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2246                             tmp->ctx.table == table &&
2247                             nft_trans_chain_update(tmp) &&
2248                             nft_trans_chain_name(tmp) &&
2249                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2250                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2251                                 kfree(name);
2252                                 goto err;
2253                         }
2254                 }
2255
2256                 nft_trans_chain_name(trans) = name;
2257         }
2258         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2259
2260         return 0;
2261 err:
2262         free_percpu(stats);
2263         kfree(trans);
2264         return err;
2265 }
2266
2267 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2268                                                const struct nlattr *nla)
2269 {
2270         u32 id = ntohl(nla_get_be32(nla));
2271         struct nft_trans *trans;
2272
2273         list_for_each_entry(trans, &net->nft.commit_list, list) {
2274                 struct nft_chain *chain = trans->ctx.chain;
2275
2276                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2277                     id == nft_trans_chain_id(trans))
2278                         return chain;
2279         }
2280         return ERR_PTR(-ENOENT);
2281 }
2282
2283 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2284                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2285                               const struct nlattr * const nla[],
2286                               struct netlink_ext_ack *extack)
2287 {
2288         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2289         u8 genmask = nft_genmask_next(net);
2290         int family = nfmsg->nfgen_family;
2291         struct nft_chain *chain = NULL;
2292         const struct nlattr *attr;
2293         struct nft_table *table;
2294         u8 policy = NF_ACCEPT;
2295         struct nft_ctx ctx;
2296         u64 handle = 0;
2297         u32 flags = 0;
2298
2299         lockdep_assert_held(&net->nft.commit_mutex);
2300
2301         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2302         if (IS_ERR(table)) {
2303                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2304                 return PTR_ERR(table);
2305         }
2306
2307         chain = NULL;
2308         attr = nla[NFTA_CHAIN_NAME];
2309
2310         if (nla[NFTA_CHAIN_HANDLE]) {
2311                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2312                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2313                 if (IS_ERR(chain)) {
2314                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2315                         return PTR_ERR(chain);
2316                 }
2317                 attr = nla[NFTA_CHAIN_HANDLE];
2318         } else if (nla[NFTA_CHAIN_NAME]) {
2319                 chain = nft_chain_lookup(net, table, attr, genmask);
2320                 if (IS_ERR(chain)) {
2321                         if (PTR_ERR(chain) != -ENOENT) {
2322                                 NL_SET_BAD_ATTR(extack, attr);
2323                                 return PTR_ERR(chain);
2324                         }
2325                         chain = NULL;
2326                 }
2327         } else if (!nla[NFTA_CHAIN_ID]) {
2328                 return -EINVAL;
2329         }
2330
2331         if (nla[NFTA_CHAIN_POLICY]) {
2332                 if (chain != NULL &&
2333                     !nft_is_base_chain(chain)) {
2334                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2335                         return -EOPNOTSUPP;
2336                 }
2337
2338                 if (chain == NULL &&
2339                     nla[NFTA_CHAIN_HOOK] == NULL) {
2340                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2341                         return -EOPNOTSUPP;
2342                 }
2343
2344                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2345                 switch (policy) {
2346                 case NF_DROP:
2347                 case NF_ACCEPT:
2348                         break;
2349                 default:
2350                         return -EINVAL;
2351                 }
2352         }
2353
2354         if (nla[NFTA_CHAIN_FLAGS])
2355                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2356         else if (chain)
2357                 flags = chain->flags;
2358
2359         if (flags & ~NFT_CHAIN_FLAGS)
2360                 return -EOPNOTSUPP;
2361
2362         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2363
2364         if (chain != NULL) {
2365                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2366                         NL_SET_BAD_ATTR(extack, attr);
2367                         return -EEXIST;
2368                 }
2369                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2370                         return -EOPNOTSUPP;
2371
2372                 flags |= chain->flags & NFT_CHAIN_BASE;
2373                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2374                                           extack);
2375         }
2376
2377         return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2378 }
2379
2380 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2381                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2382                               const struct nlattr * const nla[],
2383                               struct netlink_ext_ack *extack)
2384 {
2385         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2386         u8 genmask = nft_genmask_next(net);
2387         int family = nfmsg->nfgen_family;
2388         const struct nlattr *attr;
2389         struct nft_table *table;
2390         struct nft_chain *chain;
2391         struct nft_rule *rule;
2392         struct nft_ctx ctx;
2393         u64 handle;
2394         u32 use;
2395         int err;
2396
2397         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2398         if (IS_ERR(table)) {
2399                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2400                 return PTR_ERR(table);
2401         }
2402
2403         if (nla[NFTA_CHAIN_HANDLE]) {
2404                 attr = nla[NFTA_CHAIN_HANDLE];
2405                 handle = be64_to_cpu(nla_get_be64(attr));
2406                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2407         } else {
2408                 attr = nla[NFTA_CHAIN_NAME];
2409                 chain = nft_chain_lookup(net, table, attr, genmask);
2410         }
2411         if (IS_ERR(chain)) {
2412                 NL_SET_BAD_ATTR(extack, attr);
2413                 return PTR_ERR(chain);
2414         }
2415
2416         if (nlh->nlmsg_flags & NLM_F_NONREC &&
2417             chain->use > 0)
2418                 return -EBUSY;
2419
2420         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2421
2422         use = chain->use;
2423         list_for_each_entry(rule, &chain->rules, list) {
2424                 if (!nft_is_active_next(net, rule))
2425                         continue;
2426                 use--;
2427
2428                 err = nft_delrule(&ctx, rule);
2429                 if (err < 0)
2430                         return err;
2431         }
2432
2433         /* There are rules and elements that are still holding references to us,
2434          * we cannot do a recursive removal in this case.
2435          */
2436         if (use > 0) {
2437                 NL_SET_BAD_ATTR(extack, attr);
2438                 return -EBUSY;
2439         }
2440
2441         return nft_delchain(&ctx);
2442 }
2443
2444 /*
2445  * Expressions
2446  */
2447
2448 /**
2449  *      nft_register_expr - register nf_tables expr type
2450  *      @type: expr type
2451  *
2452  *      Registers the expr type for use with nf_tables. Returns zero on
2453  *      success or a negative errno code otherwise.
2454  */
2455 int nft_register_expr(struct nft_expr_type *type)
2456 {
2457         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2458         if (type->family == NFPROTO_UNSPEC)
2459                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2460         else
2461                 list_add_rcu(&type->list, &nf_tables_expressions);
2462         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2463         return 0;
2464 }
2465 EXPORT_SYMBOL_GPL(nft_register_expr);
2466
2467 /**
2468  *      nft_unregister_expr - unregister nf_tables expr type
2469  *      @type: expr type
2470  *
2471  *      Unregisters the expr typefor use with nf_tables.
2472  */
2473 void nft_unregister_expr(struct nft_expr_type *type)
2474 {
2475         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2476         list_del_rcu(&type->list);
2477         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2478 }
2479 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2480
2481 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2482                                                        struct nlattr *nla)
2483 {
2484         const struct nft_expr_type *type, *candidate = NULL;
2485
2486         list_for_each_entry(type, &nf_tables_expressions, list) {
2487                 if (!nla_strcmp(nla, type->name)) {
2488                         if (!type->family && !candidate)
2489                                 candidate = type;
2490                         else if (type->family == family)
2491                                 candidate = type;
2492                 }
2493         }
2494         return candidate;
2495 }
2496
2497 #ifdef CONFIG_MODULES
2498 static int nft_expr_type_request_module(struct net *net, u8 family,
2499                                         struct nlattr *nla)
2500 {
2501         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2502                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2503                 return -EAGAIN;
2504
2505         return 0;
2506 }
2507 #endif
2508
2509 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2510                                                      u8 family,
2511                                                      struct nlattr *nla)
2512 {
2513         const struct nft_expr_type *type;
2514
2515         if (nla == NULL)
2516                 return ERR_PTR(-EINVAL);
2517
2518         type = __nft_expr_type_get(family, nla);
2519         if (type != NULL && try_module_get(type->owner))
2520                 return type;
2521
2522         lockdep_nfnl_nft_mutex_not_held();
2523 #ifdef CONFIG_MODULES
2524         if (type == NULL) {
2525                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2526                         return ERR_PTR(-EAGAIN);
2527
2528                 if (nft_request_module(net, "nft-expr-%.*s",
2529                                        nla_len(nla),
2530                                        (char *)nla_data(nla)) == -EAGAIN)
2531                         return ERR_PTR(-EAGAIN);
2532         }
2533 #endif
2534         return ERR_PTR(-ENOENT);
2535 }
2536
2537 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2538         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2539                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2540         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2541 };
2542
2543 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2544                                     const struct nft_expr *expr)
2545 {
2546         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2547                 goto nla_put_failure;
2548
2549         if (expr->ops->dump) {
2550                 struct nlattr *data = nla_nest_start_noflag(skb,
2551                                                             NFTA_EXPR_DATA);
2552                 if (data == NULL)
2553                         goto nla_put_failure;
2554                 if (expr->ops->dump(skb, expr) < 0)
2555                         goto nla_put_failure;
2556                 nla_nest_end(skb, data);
2557         }
2558
2559         return skb->len;
2560
2561 nla_put_failure:
2562         return -1;
2563 };
2564
2565 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2566                   const struct nft_expr *expr)
2567 {
2568         struct nlattr *nest;
2569
2570         nest = nla_nest_start_noflag(skb, attr);
2571         if (!nest)
2572                 goto nla_put_failure;
2573         if (nf_tables_fill_expr_info(skb, expr) < 0)
2574                 goto nla_put_failure;
2575         nla_nest_end(skb, nest);
2576         return 0;
2577
2578 nla_put_failure:
2579         return -1;
2580 }
2581
2582 struct nft_expr_info {
2583         const struct nft_expr_ops       *ops;
2584         const struct nlattr             *attr;
2585         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2586 };
2587
2588 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2589                                 const struct nlattr *nla,
2590                                 struct nft_expr_info *info)
2591 {
2592         const struct nft_expr_type *type;
2593         const struct nft_expr_ops *ops;
2594         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2595         int err;
2596
2597         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2598                                           nft_expr_policy, NULL);
2599         if (err < 0)
2600                 return err;
2601
2602         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2603         if (IS_ERR(type))
2604                 return PTR_ERR(type);
2605
2606         if (tb[NFTA_EXPR_DATA]) {
2607                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2608                                                   tb[NFTA_EXPR_DATA],
2609                                                   type->policy, NULL);
2610                 if (err < 0)
2611                         goto err1;
2612         } else
2613                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2614
2615         if (type->select_ops != NULL) {
2616                 ops = type->select_ops(ctx,
2617                                        (const struct nlattr * const *)info->tb);
2618                 if (IS_ERR(ops)) {
2619                         err = PTR_ERR(ops);
2620 #ifdef CONFIG_MODULES
2621                         if (err == -EAGAIN)
2622                                 if (nft_expr_type_request_module(ctx->net,
2623                                                                  ctx->family,
2624                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2625                                         err = -ENOENT;
2626 #endif
2627                         goto err1;
2628                 }
2629         } else
2630                 ops = type->ops;
2631
2632         info->attr = nla;
2633         info->ops = ops;
2634
2635         return 0;
2636
2637 err1:
2638         module_put(type->owner);
2639         return err;
2640 }
2641
2642 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2643                              const struct nft_expr_info *info,
2644                              struct nft_expr *expr)
2645 {
2646         const struct nft_expr_ops *ops = info->ops;
2647         int err;
2648
2649         expr->ops = ops;
2650         if (ops->init) {
2651                 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2652                 if (err < 0)
2653                         goto err1;
2654         }
2655
2656         return 0;
2657 err1:
2658         expr->ops = NULL;
2659         return err;
2660 }
2661
2662 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2663                                    struct nft_expr *expr)
2664 {
2665         const struct nft_expr_type *type = expr->ops->type;
2666
2667         if (expr->ops->destroy)
2668                 expr->ops->destroy(ctx, expr);
2669         module_put(type->owner);
2670 }
2671
2672 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2673                                       const struct nlattr *nla)
2674 {
2675         struct nft_expr_info info;
2676         struct nft_expr *expr;
2677         struct module *owner;
2678         int err;
2679
2680         err = nf_tables_expr_parse(ctx, nla, &info);
2681         if (err < 0)
2682                 goto err1;
2683
2684         err = -ENOMEM;
2685         expr = kzalloc(info.ops->size, GFP_KERNEL);
2686         if (expr == NULL)
2687                 goto err2;
2688
2689         err = nf_tables_newexpr(ctx, &info, expr);
2690         if (err < 0)
2691                 goto err3;
2692
2693         return expr;
2694 err3:
2695         kfree(expr);
2696 err2:
2697         owner = info.ops->type->owner;
2698         if (info.ops->type->release_ops)
2699                 info.ops->type->release_ops(info.ops);
2700
2701         module_put(owner);
2702 err1:
2703         return ERR_PTR(err);
2704 }
2705
2706 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2707 {
2708         int err;
2709
2710         if (src->ops->clone) {
2711                 dst->ops = src->ops;
2712                 err = src->ops->clone(dst, src);
2713                 if (err < 0)
2714                         return err;
2715         } else {
2716                 memcpy(dst, src, src->ops->size);
2717         }
2718
2719         __module_get(src->ops->type->owner);
2720
2721         return 0;
2722 }
2723
2724 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2725 {
2726         nf_tables_expr_destroy(ctx, expr);
2727         kfree(expr);
2728 }
2729
2730 /*
2731  * Rules
2732  */
2733
2734 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2735                                           u64 handle)
2736 {
2737         struct nft_rule *rule;
2738
2739         // FIXME: this sucks
2740         list_for_each_entry_rcu(rule, &chain->rules, list) {
2741                 if (handle == rule->handle)
2742                         return rule;
2743         }
2744
2745         return ERR_PTR(-ENOENT);
2746 }
2747
2748 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2749                                         const struct nlattr *nla)
2750 {
2751         if (nla == NULL)
2752                 return ERR_PTR(-EINVAL);
2753
2754         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2755 }
2756
2757 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2758         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2759                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2760         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2761                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2762         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2763         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2764         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2765         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2766         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2767                                     .len = NFT_USERDATA_MAXLEN },
2768         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2769         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2770         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2771 };
2772
2773 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2774                                     u32 portid, u32 seq, int event,
2775                                     u32 flags, int family,
2776                                     const struct nft_table *table,
2777                                     const struct nft_chain *chain,
2778                                     const struct nft_rule *rule,
2779                                     const struct nft_rule *prule)
2780 {
2781         struct nlmsghdr *nlh;
2782         struct nfgenmsg *nfmsg;
2783         const struct nft_expr *expr, *next;
2784         struct nlattr *list;
2785         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2786
2787         nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2788         if (nlh == NULL)
2789                 goto nla_put_failure;
2790
2791         nfmsg = nlmsg_data(nlh);
2792         nfmsg->nfgen_family     = family;
2793         nfmsg->version          = NFNETLINK_V0;
2794         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
2795
2796         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2797                 goto nla_put_failure;
2798         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2799                 goto nla_put_failure;
2800         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2801                          NFTA_RULE_PAD))
2802                 goto nla_put_failure;
2803
2804         if (event != NFT_MSG_DELRULE && prule) {
2805                 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2806                                  cpu_to_be64(prule->handle),
2807                                  NFTA_RULE_PAD))
2808                         goto nla_put_failure;
2809         }
2810
2811         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2812         if (list == NULL)
2813                 goto nla_put_failure;
2814         nft_rule_for_each_expr(expr, next, rule) {
2815                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2816                         goto nla_put_failure;
2817         }
2818         nla_nest_end(skb, list);
2819
2820         if (rule->udata) {
2821                 struct nft_userdata *udata = nft_userdata(rule);
2822                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2823                             udata->data) < 0)
2824                         goto nla_put_failure;
2825         }
2826
2827         nlmsg_end(skb, nlh);
2828         return 0;
2829
2830 nla_put_failure:
2831         nlmsg_trim(skb, nlh);
2832         return -1;
2833 }
2834
2835 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2836                                   const struct nft_rule *rule, int event)
2837 {
2838         struct sk_buff *skb;
2839         int err;
2840         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
2841                               ctx->table->name, ctx->table->handle,
2842                               ctx->chain->name, ctx->chain->handle);
2843
2844         audit_log_nfcfg(buf,
2845                         ctx->family,
2846                         rule->handle,
2847                         event == NFT_MSG_NEWRULE ?
2848                                 AUDIT_NFT_OP_RULE_REGISTER :
2849                                 AUDIT_NFT_OP_RULE_UNREGISTER,
2850                         GFP_KERNEL);
2851         kfree(buf);
2852
2853         if (!ctx->report &&
2854             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2855                 return;
2856
2857         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2858         if (skb == NULL)
2859                 goto err;
2860
2861         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2862                                        event, 0, ctx->family, ctx->table,
2863                                        ctx->chain, rule, NULL);
2864         if (err < 0) {
2865                 kfree_skb(skb);
2866                 goto err;
2867         }
2868
2869         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
2870         return;
2871 err:
2872         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2873 }
2874
2875 struct nft_rule_dump_ctx {
2876         char *table;
2877         char *chain;
2878 };
2879
2880 static int __nf_tables_dump_rules(struct sk_buff *skb,
2881                                   unsigned int *idx,
2882                                   struct netlink_callback *cb,
2883                                   const struct nft_table *table,
2884                                   const struct nft_chain *chain)
2885 {
2886         struct net *net = sock_net(skb->sk);
2887         const struct nft_rule *rule, *prule;
2888         unsigned int s_idx = cb->args[0];
2889
2890         prule = NULL;
2891         list_for_each_entry_rcu(rule, &chain->rules, list) {
2892                 if (!nft_is_active(net, rule))
2893                         goto cont_skip;
2894                 if (*idx < s_idx)
2895                         goto cont;
2896                 if (*idx > s_idx) {
2897                         memset(&cb->args[1], 0,
2898                                         sizeof(cb->args) - sizeof(cb->args[0]));
2899                 }
2900                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2901                                         cb->nlh->nlmsg_seq,
2902                                         NFT_MSG_NEWRULE,
2903                                         NLM_F_MULTI | NLM_F_APPEND,
2904                                         table->family,
2905                                         table, chain, rule, prule) < 0)
2906                         return 1;
2907
2908                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2909 cont:
2910                 prule = rule;
2911 cont_skip:
2912                 (*idx)++;
2913         }
2914         return 0;
2915 }
2916
2917 static int nf_tables_dump_rules(struct sk_buff *skb,
2918                                 struct netlink_callback *cb)
2919 {
2920         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2921         const struct nft_rule_dump_ctx *ctx = cb->data;
2922         struct nft_table *table;
2923         const struct nft_chain *chain;
2924         unsigned int idx = 0;
2925         struct net *net = sock_net(skb->sk);
2926         int family = nfmsg->nfgen_family;
2927
2928         rcu_read_lock();
2929         cb->seq = net->nft.base_seq;
2930
2931         list_for_each_entry_rcu(table, &net->nft.tables, list) {
2932                 if (family != NFPROTO_UNSPEC && family != table->family)
2933                         continue;
2934
2935                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2936                         continue;
2937
2938                 if (ctx && ctx->table && ctx->chain) {
2939                         struct rhlist_head *list, *tmp;
2940
2941                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
2942                                                nft_chain_ht_params);
2943                         if (!list)
2944                                 goto done;
2945
2946                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2947                                 if (!nft_is_active(net, chain))
2948                                         continue;
2949                                 __nf_tables_dump_rules(skb, &idx,
2950                                                        cb, table, chain);
2951                                 break;
2952                         }
2953                         goto done;
2954                 }
2955
2956                 list_for_each_entry_rcu(chain, &table->chains, list) {
2957                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2958                                 goto done;
2959                 }
2960
2961                 if (ctx && ctx->table)
2962                         break;
2963         }
2964 done:
2965         rcu_read_unlock();
2966
2967         cb->args[0] = idx;
2968         return skb->len;
2969 }
2970
2971 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2972 {
2973         const struct nlattr * const *nla = cb->data;
2974         struct nft_rule_dump_ctx *ctx = NULL;
2975
2976         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2977                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2978                 if (!ctx)
2979                         return -ENOMEM;
2980
2981                 if (nla[NFTA_RULE_TABLE]) {
2982                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2983                                                         GFP_ATOMIC);
2984                         if (!ctx->table) {
2985                                 kfree(ctx);
2986                                 return -ENOMEM;
2987                         }
2988                 }
2989                 if (nla[NFTA_RULE_CHAIN]) {
2990                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2991                                                 GFP_ATOMIC);
2992                         if (!ctx->chain) {
2993                                 kfree(ctx->table);
2994                                 kfree(ctx);
2995                                 return -ENOMEM;
2996                         }
2997                 }
2998         }
2999
3000         cb->data = ctx;
3001         return 0;
3002 }
3003
3004 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3005 {
3006         struct nft_rule_dump_ctx *ctx = cb->data;
3007
3008         if (ctx) {
3009                 kfree(ctx->table);
3010                 kfree(ctx->chain);
3011                 kfree(ctx);
3012         }
3013         return 0;
3014 }
3015
3016 /* called with rcu_read_lock held */
3017 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
3018                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3019                              const struct nlattr * const nla[],
3020                              struct netlink_ext_ack *extack)
3021 {
3022         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3023         u8 genmask = nft_genmask_cur(net);
3024         const struct nft_chain *chain;
3025         const struct nft_rule *rule;
3026         struct nft_table *table;
3027         struct sk_buff *skb2;
3028         int family = nfmsg->nfgen_family;
3029         int err;
3030
3031         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3032                 struct netlink_dump_control c = {
3033                         .start= nf_tables_dump_rules_start,
3034                         .dump = nf_tables_dump_rules,
3035                         .done = nf_tables_dump_rules_done,
3036                         .module = THIS_MODULE,
3037                         .data = (void *)nla,
3038                 };
3039
3040                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3041         }
3042
3043         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3044         if (IS_ERR(table)) {
3045                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3046                 return PTR_ERR(table);
3047         }
3048
3049         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3050         if (IS_ERR(chain)) {
3051                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3052                 return PTR_ERR(chain);
3053         }
3054
3055         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3056         if (IS_ERR(rule)) {
3057                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3058                 return PTR_ERR(rule);
3059         }
3060
3061         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3062         if (!skb2)
3063                 return -ENOMEM;
3064
3065         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3066                                        nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3067                                        family, table, chain, rule, NULL);
3068         if (err < 0)
3069                 goto err_fill_rule_info;
3070
3071         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3072
3073 err_fill_rule_info:
3074         kfree_skb(skb2);
3075         return err;
3076 }
3077
3078 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3079                                    struct nft_rule *rule)
3080 {
3081         struct nft_expr *expr, *next;
3082
3083         /*
3084          * Careful: some expressions might not be initialized in case this
3085          * is called on error from nf_tables_newrule().
3086          */
3087         expr = nft_expr_first(rule);
3088         while (nft_expr_more(rule, expr)) {
3089                 next = nft_expr_next(expr);
3090                 nf_tables_expr_destroy(ctx, expr);
3091                 expr = next;
3092         }
3093         kfree(rule);
3094 }
3095
3096 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3097 {
3098         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3099         nf_tables_rule_destroy(ctx, rule);
3100 }
3101
3102 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3103 {
3104         struct nft_expr *expr, *last;
3105         const struct nft_data *data;
3106         struct nft_rule *rule;
3107         int err;
3108
3109         if (ctx->level == NFT_JUMP_STACK_SIZE)
3110                 return -EMLINK;
3111
3112         list_for_each_entry(rule, &chain->rules, list) {
3113                 if (!nft_is_active_next(ctx->net, rule))
3114                         continue;
3115
3116                 nft_rule_for_each_expr(expr, last, rule) {
3117                         if (!expr->ops->validate)
3118                                 continue;
3119
3120                         err = expr->ops->validate(ctx, expr, &data);
3121                         if (err < 0)
3122                                 return err;
3123                 }
3124         }
3125
3126         return 0;
3127 }
3128 EXPORT_SYMBOL_GPL(nft_chain_validate);
3129
3130 static int nft_table_validate(struct net *net, const struct nft_table *table)
3131 {
3132         struct nft_chain *chain;
3133         struct nft_ctx ctx = {
3134                 .net    = net,
3135                 .family = table->family,
3136         };
3137         int err;
3138
3139         list_for_each_entry(chain, &table->chains, list) {
3140                 if (!nft_is_base_chain(chain))
3141                         continue;
3142
3143                 ctx.chain = chain;
3144                 err = nft_chain_validate(&ctx, chain);
3145                 if (err < 0)
3146                         return err;
3147         }
3148
3149         return 0;
3150 }
3151
3152 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3153                                              const struct nlattr *nla);
3154
3155 #define NFT_RULE_MAXEXPRS       128
3156
3157 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3158                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3159                              const struct nlattr * const nla[],
3160                              struct netlink_ext_ack *extack)
3161 {
3162         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3163         u8 genmask = nft_genmask_next(net);
3164         struct nft_expr_info *info = NULL;
3165         int family = nfmsg->nfgen_family;
3166         struct nft_flow_rule *flow;
3167         struct nft_table *table;
3168         struct nft_chain *chain;
3169         struct nft_rule *rule, *old_rule = NULL;
3170         struct nft_userdata *udata;
3171         struct nft_trans *trans = NULL;
3172         struct nft_expr *expr;
3173         struct nft_ctx ctx;
3174         struct nlattr *tmp;
3175         unsigned int size, i, n, ulen = 0, usize = 0;
3176         int err, rem;
3177         u64 handle, pos_handle;
3178
3179         lockdep_assert_held(&net->nft.commit_mutex);
3180
3181         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3182         if (IS_ERR(table)) {
3183                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3184                 return PTR_ERR(table);
3185         }
3186
3187         if (nla[NFTA_RULE_CHAIN]) {
3188                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3189                                          genmask);
3190                 if (IS_ERR(chain)) {
3191                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3192                         return PTR_ERR(chain);
3193                 }
3194                 if (nft_chain_is_bound(chain))
3195                         return -EOPNOTSUPP;
3196
3197         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3198                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3199                 if (IS_ERR(chain)) {
3200                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3201                         return PTR_ERR(chain);
3202                 }
3203         } else {
3204                 return -EINVAL;
3205         }
3206
3207         if (nla[NFTA_RULE_HANDLE]) {
3208                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3209                 rule = __nft_rule_lookup(chain, handle);
3210                 if (IS_ERR(rule)) {
3211                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3212                         return PTR_ERR(rule);
3213                 }
3214
3215                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3216                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3217                         return -EEXIST;
3218                 }
3219                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3220                         old_rule = rule;
3221                 else
3222                         return -EOPNOTSUPP;
3223         } else {
3224                 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3225                     nlh->nlmsg_flags & NLM_F_REPLACE)
3226                         return -EINVAL;
3227                 handle = nf_tables_alloc_handle(table);
3228
3229                 if (chain->use == UINT_MAX)
3230                         return -EOVERFLOW;
3231
3232                 if (nla[NFTA_RULE_POSITION]) {
3233                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3234                         old_rule = __nft_rule_lookup(chain, pos_handle);
3235                         if (IS_ERR(old_rule)) {
3236                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3237                                 return PTR_ERR(old_rule);
3238                         }
3239                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3240                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3241                         if (IS_ERR(old_rule)) {
3242                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3243                                 return PTR_ERR(old_rule);
3244                         }
3245                 }
3246         }
3247
3248         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3249
3250         n = 0;
3251         size = 0;
3252         if (nla[NFTA_RULE_EXPRESSIONS]) {
3253                 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3254                                       sizeof(struct nft_expr_info),
3255                                       GFP_KERNEL);
3256                 if (!info)
3257                         return -ENOMEM;
3258
3259                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3260                         err = -EINVAL;
3261                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3262                                 goto err1;
3263                         if (n == NFT_RULE_MAXEXPRS)
3264                                 goto err1;
3265                         err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3266                         if (err < 0)
3267                                 goto err1;
3268                         size += info[n].ops->size;
3269                         n++;
3270                 }
3271         }
3272         /* Check for overflow of dlen field */
3273         err = -EFBIG;
3274         if (size >= 1 << 12)
3275                 goto err1;
3276
3277         if (nla[NFTA_RULE_USERDATA]) {
3278                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3279                 if (ulen > 0)
3280                         usize = sizeof(struct nft_userdata) + ulen;
3281         }
3282
3283         err = -ENOMEM;
3284         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3285         if (rule == NULL)
3286                 goto err1;
3287
3288         nft_activate_next(net, rule);
3289
3290         rule->handle = handle;
3291         rule->dlen   = size;
3292         rule->udata  = ulen ? 1 : 0;
3293
3294         if (ulen) {
3295                 udata = nft_userdata(rule);
3296                 udata->len = ulen - 1;
3297                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3298         }
3299
3300         expr = nft_expr_first(rule);
3301         for (i = 0; i < n; i++) {
3302                 err = nf_tables_newexpr(&ctx, &info[i], expr);
3303                 if (err < 0) {
3304                         NL_SET_BAD_ATTR(extack, info[i].attr);
3305                         goto err2;
3306                 }
3307
3308                 if (info[i].ops->validate)
3309                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3310
3311                 info[i].ops = NULL;
3312                 expr = nft_expr_next(expr);
3313         }
3314
3315         if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3316                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3317                 if (trans == NULL) {
3318                         err = -ENOMEM;
3319                         goto err2;
3320                 }
3321                 err = nft_delrule(&ctx, old_rule);
3322                 if (err < 0) {
3323                         nft_trans_destroy(trans);
3324                         goto err2;
3325                 }
3326
3327                 list_add_tail_rcu(&rule->list, &old_rule->list);
3328         } else {
3329                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3330                 if (!trans) {
3331                         err = -ENOMEM;
3332                         goto err2;
3333                 }
3334
3335                 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3336                         if (old_rule)
3337                                 list_add_rcu(&rule->list, &old_rule->list);
3338                         else
3339                                 list_add_tail_rcu(&rule->list, &chain->rules);
3340                  } else {
3341                         if (old_rule)
3342                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3343                         else
3344                                 list_add_rcu(&rule->list, &chain->rules);
3345                 }
3346         }
3347         kvfree(info);
3348         chain->use++;
3349
3350         if (net->nft.validate_state == NFT_VALIDATE_DO)
3351                 return nft_table_validate(net, table);
3352
3353         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3354                 flow = nft_flow_rule_create(net, rule);
3355                 if (IS_ERR(flow))
3356                         return PTR_ERR(flow);
3357
3358                 nft_trans_flow_rule(trans) = flow;
3359         }
3360
3361         return 0;
3362 err2:
3363         nf_tables_rule_release(&ctx, rule);
3364 err1:
3365         for (i = 0; i < n; i++) {
3366                 if (info[i].ops) {
3367                         module_put(info[i].ops->type->owner);
3368                         if (info[i].ops->type->release_ops)
3369                                 info[i].ops->type->release_ops(info[i].ops);
3370                 }
3371         }
3372         kvfree(info);
3373         return err;
3374 }
3375
3376 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3377                                              const struct nlattr *nla)
3378 {
3379         u32 id = ntohl(nla_get_be32(nla));
3380         struct nft_trans *trans;
3381
3382         list_for_each_entry(trans, &net->nft.commit_list, list) {
3383                 struct nft_rule *rule = nft_trans_rule(trans);
3384
3385                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3386                     id == nft_trans_rule_id(trans))
3387                         return rule;
3388         }
3389         return ERR_PTR(-ENOENT);
3390 }
3391
3392 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3393                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3394                              const struct nlattr * const nla[],
3395                              struct netlink_ext_ack *extack)
3396 {
3397         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3398         u8 genmask = nft_genmask_next(net);
3399         struct nft_table *table;
3400         struct nft_chain *chain = NULL;
3401         struct nft_rule *rule;
3402         int family = nfmsg->nfgen_family, err = 0;
3403         struct nft_ctx ctx;
3404
3405         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3406         if (IS_ERR(table)) {
3407                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3408                 return PTR_ERR(table);
3409         }
3410
3411         if (nla[NFTA_RULE_CHAIN]) {
3412                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3413                                          genmask);
3414                 if (IS_ERR(chain)) {
3415                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3416                         return PTR_ERR(chain);
3417                 }
3418                 if (nft_chain_is_bound(chain))
3419                         return -EOPNOTSUPP;
3420         }
3421
3422         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3423
3424         if (chain) {
3425                 if (nla[NFTA_RULE_HANDLE]) {
3426                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3427                         if (IS_ERR(rule)) {
3428                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3429                                 return PTR_ERR(rule);
3430                         }
3431
3432                         err = nft_delrule(&ctx, rule);
3433                 } else if (nla[NFTA_RULE_ID]) {
3434                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3435                         if (IS_ERR(rule)) {
3436                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3437                                 return PTR_ERR(rule);
3438                         }
3439
3440                         err = nft_delrule(&ctx, rule);
3441                 } else {
3442                         err = nft_delrule_by_chain(&ctx);
3443                 }
3444         } else {
3445                 list_for_each_entry(chain, &table->chains, list) {
3446                         if (!nft_is_active_next(net, chain))
3447                                 continue;
3448
3449                         ctx.chain = chain;
3450                         err = nft_delrule_by_chain(&ctx);
3451                         if (err < 0)
3452                                 break;
3453                 }
3454         }
3455
3456         return err;
3457 }
3458
3459 /*
3460  * Sets
3461  */
3462 static const struct nft_set_type *nft_set_types[] = {
3463         &nft_set_hash_fast_type,
3464         &nft_set_hash_type,
3465         &nft_set_rhash_type,
3466         &nft_set_bitmap_type,
3467         &nft_set_rbtree_type,
3468 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3469         &nft_set_pipapo_avx2_type,
3470 #endif
3471         &nft_set_pipapo_type,
3472 };
3473
3474 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3475                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3476                                  NFT_SET_EVAL)
3477
3478 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3479 {
3480         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3481 }
3482
3483 /*
3484  * Select a set implementation based on the data characteristics and the
3485  * given policy. The total memory use might not be known if no size is
3486  * given, in that case the amount of memory per element is used.
3487  */
3488 static const struct nft_set_ops *
3489 nft_select_set_ops(const struct nft_ctx *ctx,
3490                    const struct nlattr * const nla[],
3491                    const struct nft_set_desc *desc,
3492                    enum nft_set_policies policy)
3493 {
3494         const struct nft_set_ops *ops, *bops;
3495         struct nft_set_estimate est, best;
3496         const struct nft_set_type *type;
3497         u32 flags = 0;
3498         int i;
3499
3500         lockdep_assert_held(&ctx->net->nft.commit_mutex);
3501         lockdep_nfnl_nft_mutex_not_held();
3502
3503         if (nla[NFTA_SET_FLAGS] != NULL)
3504                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3505
3506         bops        = NULL;
3507         best.size   = ~0;
3508         best.lookup = ~0;
3509         best.space  = ~0;
3510
3511         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3512                 type = nft_set_types[i];
3513                 ops = &type->ops;
3514
3515                 if (!nft_set_ops_candidate(type, flags))
3516                         continue;
3517                 if (!ops->estimate(desc, flags, &est))
3518                         continue;
3519
3520                 switch (policy) {
3521                 case NFT_SET_POL_PERFORMANCE:
3522                         if (est.lookup < best.lookup)
3523                                 break;
3524                         if (est.lookup == best.lookup &&
3525                             est.space < best.space)
3526                                 break;
3527                         continue;
3528                 case NFT_SET_POL_MEMORY:
3529                         if (!desc->size) {
3530                                 if (est.space < best.space)
3531                                         break;
3532                                 if (est.space == best.space &&
3533                                     est.lookup < best.lookup)
3534                                         break;
3535                         } else if (est.size < best.size || !bops) {
3536                                 break;
3537                         }
3538                         continue;
3539                 default:
3540                         break;
3541                 }
3542
3543                 bops = ops;
3544                 best = est;
3545         }
3546
3547         if (bops != NULL)
3548                 return bops;
3549
3550         return ERR_PTR(-EOPNOTSUPP);
3551 }
3552
3553 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3554         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3555                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3556         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3557                                             .len = NFT_SET_MAXNAMELEN - 1 },
3558         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3559         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3560         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3561         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3562         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3563         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3564         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3565         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3566         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3567         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3568         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3569                                             .len  = NFT_USERDATA_MAXLEN },
3570         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3571         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3572         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3573 };
3574
3575 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3576         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3577         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3578 };
3579
3580 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3581                                      const struct sk_buff *skb,
3582                                      const struct nlmsghdr *nlh,
3583                                      const struct nlattr * const nla[],
3584                                      struct netlink_ext_ack *extack,
3585                                      u8 genmask)
3586 {
3587         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3588         int family = nfmsg->nfgen_family;
3589         struct nft_table *table = NULL;
3590
3591         if (nla[NFTA_SET_TABLE] != NULL) {
3592                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3593                                          genmask);
3594                 if (IS_ERR(table)) {
3595                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3596                         return PTR_ERR(table);
3597                 }
3598         }
3599
3600         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3601         return 0;
3602 }
3603
3604 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3605                                       const struct nlattr *nla, u8 genmask)
3606 {
3607         struct nft_set *set;
3608
3609         if (nla == NULL)
3610                 return ERR_PTR(-EINVAL);
3611
3612         list_for_each_entry_rcu(set, &table->sets, list) {
3613                 if (!nla_strcmp(nla, set->name) &&
3614                     nft_active_genmask(set, genmask))
3615                         return set;
3616         }
3617         return ERR_PTR(-ENOENT);
3618 }
3619
3620 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3621                                                const struct nlattr *nla,
3622                                                u8 genmask)
3623 {
3624         struct nft_set *set;
3625
3626         list_for_each_entry(set, &table->sets, list) {
3627                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3628                     nft_active_genmask(set, genmask))
3629                         return set;
3630         }
3631         return ERR_PTR(-ENOENT);
3632 }
3633
3634 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3635                                            const struct nlattr *nla, u8 genmask)
3636 {
3637         struct nft_trans *trans;
3638         u32 id = ntohl(nla_get_be32(nla));
3639
3640         list_for_each_entry(trans, &net->nft.commit_list, list) {
3641                 if (trans->msg_type == NFT_MSG_NEWSET) {
3642                         struct nft_set *set = nft_trans_set(trans);
3643
3644                         if (id == nft_trans_set_id(trans) &&
3645                             nft_active_genmask(set, genmask))
3646                                 return set;
3647                 }
3648         }
3649         return ERR_PTR(-ENOENT);
3650 }
3651
3652 struct nft_set *nft_set_lookup_global(const struct net *net,
3653                                       const struct nft_table *table,
3654                                       const struct nlattr *nla_set_name,
3655                                       const struct nlattr *nla_set_id,
3656                                       u8 genmask)
3657 {
3658         struct nft_set *set;
3659
3660         set = nft_set_lookup(table, nla_set_name, genmask);
3661         if (IS_ERR(set)) {
3662                 if (!nla_set_id)
3663                         return set;
3664
3665                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3666         }
3667         return set;
3668 }
3669 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3670
3671 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3672                                     const char *name)
3673 {
3674         const struct nft_set *i;
3675         const char *p;
3676         unsigned long *inuse;
3677         unsigned int n = 0, min = 0;
3678
3679         p = strchr(name, '%');
3680         if (p != NULL) {
3681                 if (p[1] != 'd' || strchr(p + 2, '%'))
3682                         return -EINVAL;
3683
3684                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3685                 if (inuse == NULL)
3686                         return -ENOMEM;
3687 cont:
3688                 list_for_each_entry(i, &ctx->table->sets, list) {
3689                         int tmp;
3690
3691                         if (!nft_is_active_next(ctx->net, set))
3692                                 continue;
3693                         if (!sscanf(i->name, name, &tmp))
3694                                 continue;
3695                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3696                                 continue;
3697
3698                         set_bit(tmp - min, inuse);
3699                 }
3700
3701                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3702                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3703                         min += BITS_PER_BYTE * PAGE_SIZE;
3704                         memset(inuse, 0, PAGE_SIZE);
3705                         goto cont;
3706                 }
3707                 free_page((unsigned long)inuse);
3708         }
3709
3710         set->name = kasprintf(GFP_KERNEL, name, min + n);
3711         if (!set->name)
3712                 return -ENOMEM;
3713
3714         list_for_each_entry(i, &ctx->table->sets, list) {
3715                 if (!nft_is_active_next(ctx->net, i))
3716                         continue;
3717                 if (!strcmp(set->name, i->name)) {
3718                         kfree(set->name);
3719                         set->name = NULL;
3720                         return -ENFILE;
3721                 }
3722         }
3723         return 0;
3724 }
3725
3726 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3727 {
3728         u64 ms = be64_to_cpu(nla_get_be64(nla));
3729         u64 max = (u64)(~((u64)0));
3730
3731         max = div_u64(max, NSEC_PER_MSEC);
3732         if (ms >= max)
3733                 return -ERANGE;
3734
3735         ms *= NSEC_PER_MSEC;
3736         *result = nsecs_to_jiffies64(ms);
3737         return 0;
3738 }
3739
3740 __be64 nf_jiffies64_to_msecs(u64 input)
3741 {
3742         return cpu_to_be64(jiffies64_to_msecs(input));
3743 }
3744
3745 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3746                                      const struct nft_set *set)
3747 {
3748         struct nlattr *concat, *field;
3749         int i;
3750
3751         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3752         if (!concat)
3753                 return -ENOMEM;
3754
3755         for (i = 0; i < set->field_count; i++) {
3756                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3757                 if (!field)
3758                         return -ENOMEM;
3759
3760                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3761                                  htonl(set->field_len[i])))
3762                         return -ENOMEM;
3763
3764                 nla_nest_end(skb, field);
3765         }
3766
3767         nla_nest_end(skb, concat);
3768
3769         return 0;
3770 }
3771
3772 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3773                               const struct nft_set *set, u16 event, u16 flags)
3774 {
3775         struct nfgenmsg *nfmsg;
3776         struct nlmsghdr *nlh;
3777         u32 portid = ctx->portid;
3778         struct nlattr *nest;
3779         u32 seq = ctx->seq;
3780
3781         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3782         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3783                         flags);
3784         if (nlh == NULL)
3785                 goto nla_put_failure;
3786
3787         nfmsg = nlmsg_data(nlh);
3788         nfmsg->nfgen_family     = ctx->family;
3789         nfmsg->version          = NFNETLINK_V0;
3790         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
3791
3792         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3793                 goto nla_put_failure;
3794         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3795                 goto nla_put_failure;
3796         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3797                          NFTA_SET_PAD))
3798                 goto nla_put_failure;
3799         if (set->flags != 0)
3800                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3801                         goto nla_put_failure;
3802
3803         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3804                 goto nla_put_failure;
3805         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3806                 goto nla_put_failure;
3807         if (set->flags & NFT_SET_MAP) {
3808                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3809                         goto nla_put_failure;
3810                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3811                         goto nla_put_failure;
3812         }
3813         if (set->flags & NFT_SET_OBJECT &&
3814             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3815                 goto nla_put_failure;
3816
3817         if (set->timeout &&
3818             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3819                          nf_jiffies64_to_msecs(set->timeout),
3820                          NFTA_SET_PAD))
3821                 goto nla_put_failure;
3822         if (set->gc_int &&
3823             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3824                 goto nla_put_failure;
3825
3826         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3827                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3828                         goto nla_put_failure;
3829         }
3830
3831         if (set->udata &&
3832             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3833                 goto nla_put_failure;
3834
3835         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3836         if (!nest)
3837                 goto nla_put_failure;
3838         if (set->size &&
3839             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3840                 goto nla_put_failure;
3841
3842         if (set->field_count > 1 &&
3843             nf_tables_fill_set_concat(skb, set))
3844                 goto nla_put_failure;
3845
3846         nla_nest_end(skb, nest);
3847
3848         if (set->expr) {
3849                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3850                 if (nf_tables_fill_expr_info(skb, set->expr) < 0)
3851                         goto nla_put_failure;
3852
3853                 nla_nest_end(skb, nest);
3854         }
3855
3856         nlmsg_end(skb, nlh);
3857         return 0;
3858
3859 nla_put_failure:
3860         nlmsg_trim(skb, nlh);
3861         return -1;
3862 }
3863
3864 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3865                                  const struct nft_set *set, int event,
3866                                  gfp_t gfp_flags)
3867 {
3868         struct sk_buff *skb;
3869         u32 portid = ctx->portid;
3870         int err;
3871         char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
3872                               ctx->table->name, ctx->table->handle,
3873                               set->name, set->handle);
3874
3875         audit_log_nfcfg(buf,
3876                         ctx->family,
3877                         set->field_count,
3878                         event == NFT_MSG_NEWSET ?
3879                                 AUDIT_NFT_OP_SET_REGISTER :
3880                                 AUDIT_NFT_OP_SET_UNREGISTER,
3881                         gfp_flags);
3882         kfree(buf);
3883
3884         if (!ctx->report &&
3885             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3886                 return;
3887
3888         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3889         if (skb == NULL)
3890                 goto err;
3891
3892         err = nf_tables_fill_set(skb, ctx, set, event, 0);
3893         if (err < 0) {
3894                 kfree_skb(skb);
3895                 goto err;
3896         }
3897
3898         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
3899         return;
3900 err:
3901         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3902 }
3903
3904 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3905 {
3906         const struct nft_set *set;
3907         unsigned int idx, s_idx = cb->args[0];
3908         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3909         struct net *net = sock_net(skb->sk);
3910         struct nft_ctx *ctx = cb->data, ctx_set;
3911
3912         if (cb->args[1])
3913                 return skb->len;
3914
3915         rcu_read_lock();
3916         cb->seq = net->nft.base_seq;
3917
3918         list_for_each_entry_rcu(table, &net->nft.tables, list) {
3919                 if (ctx->family != NFPROTO_UNSPEC &&
3920                     ctx->family != table->family)
3921                         continue;
3922
3923                 if (ctx->table && ctx->table != table)
3924                         continue;
3925
3926                 if (cur_table) {
3927                         if (cur_table != table)
3928                                 continue;
3929
3930                         cur_table = NULL;
3931                 }
3932                 idx = 0;
3933                 list_for_each_entry_rcu(set, &table->sets, list) {
3934                         if (idx < s_idx)
3935                                 goto cont;
3936                         if (!nft_is_active(net, set))
3937                                 goto cont;
3938
3939                         ctx_set = *ctx;
3940                         ctx_set.table = table;
3941                         ctx_set.family = table->family;
3942
3943                         if (nf_tables_fill_set(skb, &ctx_set, set,
3944                                                NFT_MSG_NEWSET,
3945                                                NLM_F_MULTI) < 0) {
3946                                 cb->args[0] = idx;
3947                                 cb->args[2] = (unsigned long) table;
3948                                 goto done;
3949                         }
3950                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3951 cont:
3952                         idx++;
3953                 }
3954                 if (s_idx)
3955                         s_idx = 0;
3956         }
3957         cb->args[1] = 1;
3958 done:
3959         rcu_read_unlock();
3960         return skb->len;
3961 }
3962
3963 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3964 {
3965         struct nft_ctx *ctx_dump = NULL;
3966
3967         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3968         if (ctx_dump == NULL)
3969                 return -ENOMEM;
3970
3971         cb->data = ctx_dump;
3972         return 0;
3973 }
3974
3975 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3976 {
3977         kfree(cb->data);
3978         return 0;
3979 }
3980
3981 /* called with rcu_read_lock held */
3982 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3983                             struct sk_buff *skb, const struct nlmsghdr *nlh,
3984                             const struct nlattr * const nla[],
3985                             struct netlink_ext_ack *extack)
3986 {
3987         u8 genmask = nft_genmask_cur(net);
3988         const struct nft_set *set;
3989         struct nft_ctx ctx;
3990         struct sk_buff *skb2;
3991         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3992         int err;
3993
3994         /* Verify existence before starting dump */
3995         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3996                                         genmask);
3997         if (err < 0)
3998                 return err;
3999
4000         if (nlh->nlmsg_flags & NLM_F_DUMP) {
4001                 struct netlink_dump_control c = {
4002                         .start = nf_tables_dump_sets_start,
4003                         .dump = nf_tables_dump_sets,
4004                         .done = nf_tables_dump_sets_done,
4005                         .data = &ctx,
4006                         .module = THIS_MODULE,
4007                 };
4008
4009                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4010         }
4011
4012         /* Only accept unspec with dump */
4013         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4014                 return -EAFNOSUPPORT;
4015         if (!nla[NFTA_SET_TABLE])
4016                 return -EINVAL;
4017
4018         set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
4019         if (IS_ERR(set))
4020                 return PTR_ERR(set);
4021
4022         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4023         if (skb2 == NULL)
4024                 return -ENOMEM;
4025
4026         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4027         if (err < 0)
4028                 goto err_fill_set_info;
4029
4030         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4031
4032 err_fill_set_info:
4033         kfree_skb(skb2);
4034         return err;
4035 }
4036
4037 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4038         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4039 };
4040
4041 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4042                                      struct nft_set_desc *desc)
4043 {
4044         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4045         u32 len;
4046         int err;
4047
4048         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4049                                           nft_concat_policy, NULL);
4050         if (err < 0)
4051                 return err;
4052
4053         if (!tb[NFTA_SET_FIELD_LEN])
4054                 return -EINVAL;
4055
4056         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4057
4058         if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4059                 return -E2BIG;
4060
4061         desc->field_len[desc->field_count++] = len;
4062
4063         return 0;
4064 }
4065
4066 static int nft_set_desc_concat(struct nft_set_desc *desc,
4067                                const struct nlattr *nla)
4068 {
4069         struct nlattr *attr;
4070         int rem, err;
4071
4072         nla_for_each_nested(attr, nla, rem) {
4073                 if (nla_type(attr) != NFTA_LIST_ELEM)
4074                         return -EINVAL;
4075
4076                 err = nft_set_desc_concat_parse(attr, desc);
4077                 if (err < 0)
4078                         return err;
4079         }
4080
4081         return 0;
4082 }
4083
4084 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4085                                     const struct nlattr *nla)
4086 {
4087         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4088         int err;
4089
4090         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4091                                           nft_set_desc_policy, NULL);
4092         if (err < 0)
4093                 return err;
4094
4095         if (da[NFTA_SET_DESC_SIZE] != NULL)
4096                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4097         if (da[NFTA_SET_DESC_CONCAT])
4098                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4099
4100         return err;
4101 }
4102
4103 static int nf_tables_newset(struct net *net, struct sock *nlsk,
4104                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4105                             const struct nlattr * const nla[],
4106                             struct netlink_ext_ack *extack)
4107 {
4108         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4109         u8 genmask = nft_genmask_next(net);
4110         int family = nfmsg->nfgen_family;
4111         const struct nft_set_ops *ops;
4112         struct nft_expr *expr = NULL;
4113         struct nft_table *table;
4114         struct nft_set *set;
4115         struct nft_ctx ctx;
4116         char *name;
4117         u64 size;
4118         u64 timeout;
4119         u32 ktype, dtype, flags, policy, gc_int, objtype;
4120         struct nft_set_desc desc;
4121         unsigned char *udata;
4122         u16 udlen;
4123         int err;
4124         int i;
4125
4126         if (nla[NFTA_SET_TABLE] == NULL ||
4127             nla[NFTA_SET_NAME] == NULL ||
4128             nla[NFTA_SET_KEY_LEN] == NULL ||
4129             nla[NFTA_SET_ID] == NULL)
4130                 return -EINVAL;
4131
4132         memset(&desc, 0, sizeof(desc));
4133
4134         ktype = NFT_DATA_VALUE;
4135         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4136                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4137                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4138                         return -EINVAL;
4139         }
4140
4141         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4142         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4143                 return -EINVAL;
4144
4145         flags = 0;
4146         if (nla[NFTA_SET_FLAGS] != NULL) {
4147                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4148                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4149                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4150                               NFT_SET_MAP | NFT_SET_EVAL |
4151                               NFT_SET_OBJECT | NFT_SET_CONCAT))
4152                         return -EOPNOTSUPP;
4153                 /* Only one of these operations is supported */
4154                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4155                              (NFT_SET_MAP | NFT_SET_OBJECT))
4156                         return -EOPNOTSUPP;
4157                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4158                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4159                         return -EOPNOTSUPP;
4160         }
4161
4162         dtype = 0;
4163         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4164                 if (!(flags & NFT_SET_MAP))
4165                         return -EINVAL;
4166
4167                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4168                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4169                     dtype != NFT_DATA_VERDICT)
4170                         return -EINVAL;
4171
4172                 if (dtype != NFT_DATA_VERDICT) {
4173                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4174                                 return -EINVAL;
4175                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4176                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4177                                 return -EINVAL;
4178                 } else
4179                         desc.dlen = sizeof(struct nft_verdict);
4180         } else if (flags & NFT_SET_MAP)
4181                 return -EINVAL;
4182
4183         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4184                 if (!(flags & NFT_SET_OBJECT))
4185                         return -EINVAL;
4186
4187                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4188                 if (objtype == NFT_OBJECT_UNSPEC ||
4189                     objtype > NFT_OBJECT_MAX)
4190                         return -EOPNOTSUPP;
4191         } else if (flags & NFT_SET_OBJECT)
4192                 return -EINVAL;
4193         else
4194                 objtype = NFT_OBJECT_UNSPEC;
4195
4196         timeout = 0;
4197         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4198                 if (!(flags & NFT_SET_TIMEOUT))
4199                         return -EINVAL;
4200
4201                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4202                 if (err)
4203                         return err;
4204         }
4205         gc_int = 0;
4206         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4207                 if (!(flags & NFT_SET_TIMEOUT))
4208                         return -EINVAL;
4209                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4210         }
4211
4212         policy = NFT_SET_POL_PERFORMANCE;
4213         if (nla[NFTA_SET_POLICY] != NULL)
4214                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4215
4216         if (nla[NFTA_SET_DESC] != NULL) {
4217                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4218                 if (err < 0)
4219                         return err;
4220         }
4221
4222         if (nla[NFTA_SET_EXPR])
4223                 desc.expr = true;
4224
4225         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
4226         if (IS_ERR(table)) {
4227                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4228                 return PTR_ERR(table);
4229         }
4230
4231         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4232
4233         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4234         if (IS_ERR(set)) {
4235                 if (PTR_ERR(set) != -ENOENT) {
4236                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4237                         return PTR_ERR(set);
4238                 }
4239         } else {
4240                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4241                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4242                         return -EEXIST;
4243                 }
4244                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4245                         return -EOPNOTSUPP;
4246
4247                 return 0;
4248         }
4249
4250         if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4251                 return -ENOENT;
4252
4253         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4254         if (IS_ERR(ops))
4255                 return PTR_ERR(ops);
4256
4257         udlen = 0;
4258         if (nla[NFTA_SET_USERDATA])
4259                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4260
4261         size = 0;
4262         if (ops->privsize != NULL)
4263                 size = ops->privsize(nla, &desc);
4264
4265         set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4266         if (!set)
4267                 return -ENOMEM;
4268
4269         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4270         if (!name) {
4271                 err = -ENOMEM;
4272                 goto err_set_name;
4273         }
4274
4275         err = nf_tables_set_alloc_name(&ctx, set, name);
4276         kfree(name);
4277         if (err < 0)
4278                 goto err_set_alloc_name;
4279
4280         if (nla[NFTA_SET_EXPR]) {
4281                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4282                 if (IS_ERR(expr)) {
4283                         err = PTR_ERR(expr);
4284                         goto err_set_alloc_name;
4285                 }
4286         }
4287
4288         udata = NULL;
4289         if (udlen) {
4290                 udata = set->data + size;
4291                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4292         }
4293
4294         INIT_LIST_HEAD(&set->bindings);
4295         set->table = table;
4296         write_pnet(&set->net, net);
4297         set->ops   = ops;
4298         set->ktype = ktype;
4299         set->klen  = desc.klen;
4300         set->dtype = dtype;
4301         set->objtype = objtype;
4302         set->dlen  = desc.dlen;
4303         set->expr = expr;
4304         set->flags = flags;
4305         set->size  = desc.size;
4306         set->policy = policy;
4307         set->udlen  = udlen;
4308         set->udata  = udata;
4309         set->timeout = timeout;
4310         set->gc_int = gc_int;
4311         set->handle = nf_tables_alloc_handle(table);
4312
4313         set->field_count = desc.field_count;
4314         for (i = 0; i < desc.field_count; i++)
4315                 set->field_len[i] = desc.field_len[i];
4316
4317         err = ops->init(set, &desc, nla);
4318         if (err < 0)
4319                 goto err_set_init;
4320
4321         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4322         if (err < 0)
4323                 goto err_set_trans;
4324
4325         list_add_tail_rcu(&set->list, &table->sets);
4326         table->use++;
4327         return 0;
4328
4329 err_set_trans:
4330         ops->destroy(set);
4331 err_set_init:
4332         if (expr)
4333                 nft_expr_destroy(&ctx, expr);
4334 err_set_alloc_name:
4335         kfree(set->name);
4336 err_set_name:
4337         kvfree(set);
4338         return err;
4339 }
4340
4341 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4342 {
4343         if (WARN_ON(set->use > 0))
4344                 return;
4345
4346         if (set->expr)
4347                 nft_expr_destroy(ctx, set->expr);
4348
4349         set->ops->destroy(set);
4350         kfree(set->name);
4351         kvfree(set);
4352 }
4353
4354 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4355                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4356                             const struct nlattr * const nla[],
4357                             struct netlink_ext_ack *extack)
4358 {
4359         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4360         u8 genmask = nft_genmask_next(net);
4361         const struct nlattr *attr;
4362         struct nft_set *set;
4363         struct nft_ctx ctx;
4364         int err;
4365
4366         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4367                 return -EAFNOSUPPORT;
4368         if (nla[NFTA_SET_TABLE] == NULL)
4369                 return -EINVAL;
4370
4371         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4372                                         genmask);
4373         if (err < 0)
4374                 return err;
4375
4376         if (nla[NFTA_SET_HANDLE]) {
4377                 attr = nla[NFTA_SET_HANDLE];
4378                 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4379         } else {
4380                 attr = nla[NFTA_SET_NAME];
4381                 set = nft_set_lookup(ctx.table, attr, genmask);
4382         }
4383
4384         if (IS_ERR(set)) {
4385                 NL_SET_BAD_ATTR(extack, attr);
4386                 return PTR_ERR(set);
4387         }
4388         if (set->use ||
4389             (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4390                 NL_SET_BAD_ATTR(extack, attr);
4391                 return -EBUSY;
4392         }
4393
4394         return nft_delset(&ctx, set);
4395 }
4396
4397 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4398                                         struct nft_set *set,
4399                                         const struct nft_set_iter *iter,
4400                                         struct nft_set_elem *elem)
4401 {
4402         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4403         enum nft_registers dreg;
4404
4405         dreg = nft_type_to_reg(set->dtype);
4406         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4407                                            set->dtype == NFT_DATA_VERDICT ?
4408                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4409                                            set->dlen);
4410 }
4411
4412 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4413                        struct nft_set_binding *binding)
4414 {
4415         struct nft_set_binding *i;
4416         struct nft_set_iter iter;
4417
4418         if (set->use == UINT_MAX)
4419                 return -EOVERFLOW;
4420
4421         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4422                 return -EBUSY;
4423
4424         if (binding->flags & NFT_SET_MAP) {
4425                 /* If the set is already bound to the same chain all
4426                  * jumps are already validated for that chain.
4427                  */
4428                 list_for_each_entry(i, &set->bindings, list) {
4429                         if (i->flags & NFT_SET_MAP &&
4430                             i->chain == binding->chain)
4431                                 goto bind;
4432                 }
4433
4434                 iter.genmask    = nft_genmask_next(ctx->net);
4435                 iter.skip       = 0;
4436                 iter.count      = 0;
4437                 iter.err        = 0;
4438                 iter.fn         = nf_tables_bind_check_setelem;
4439
4440                 set->ops->walk(ctx, set, &iter);
4441                 if (iter.err < 0)
4442                         return iter.err;
4443         }
4444 bind:
4445         binding->chain = ctx->chain;
4446         list_add_tail_rcu(&binding->list, &set->bindings);
4447         nft_set_trans_bind(ctx, set);
4448         set->use++;
4449
4450         return 0;
4451 }
4452 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4453
4454 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4455                                  struct nft_set_binding *binding, bool event)
4456 {
4457         list_del_rcu(&binding->list);
4458
4459         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4460                 list_del_rcu(&set->list);
4461                 if (event)
4462                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4463                                              GFP_KERNEL);
4464         }
4465 }
4466
4467 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4468                               struct nft_set_binding *binding,
4469                               enum nft_trans_phase phase)
4470 {
4471         switch (phase) {
4472         case NFT_TRANS_PREPARE:
4473                 set->use--;
4474                 return;
4475         case NFT_TRANS_ABORT:
4476         case NFT_TRANS_RELEASE:
4477                 set->use--;
4478                 fallthrough;
4479         default:
4480                 nf_tables_unbind_set(ctx, set, binding,
4481                                      phase == NFT_TRANS_COMMIT);
4482         }
4483 }
4484 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4485
4486 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4487 {
4488         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4489                 nft_set_destroy(ctx, set);
4490 }
4491 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4492
4493 const struct nft_set_ext_type nft_set_ext_types[] = {
4494         [NFT_SET_EXT_KEY]               = {
4495                 .align  = __alignof__(u32),
4496         },
4497         [NFT_SET_EXT_DATA]              = {
4498                 .align  = __alignof__(u32),
4499         },
4500         [NFT_SET_EXT_EXPR]              = {
4501                 .align  = __alignof__(struct nft_expr),
4502         },
4503         [NFT_SET_EXT_OBJREF]            = {
4504                 .len    = sizeof(struct nft_object *),
4505                 .align  = __alignof__(struct nft_object *),
4506         },
4507         [NFT_SET_EXT_FLAGS]             = {
4508                 .len    = sizeof(u8),
4509                 .align  = __alignof__(u8),
4510         },
4511         [NFT_SET_EXT_TIMEOUT]           = {
4512                 .len    = sizeof(u64),
4513                 .align  = __alignof__(u64),
4514         },
4515         [NFT_SET_EXT_EXPIRATION]        = {
4516                 .len    = sizeof(u64),
4517                 .align  = __alignof__(u64),
4518         },
4519         [NFT_SET_EXT_USERDATA]          = {
4520                 .len    = sizeof(struct nft_userdata),
4521                 .align  = __alignof__(struct nft_userdata),
4522         },
4523         [NFT_SET_EXT_KEY_END]           = {
4524                 .align  = __alignof__(u32),
4525         },
4526 };
4527
4528 /*
4529  * Set elements
4530  */
4531
4532 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4533         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4534         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4535         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4536         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4537         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4538         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4539                                             .len = NFT_USERDATA_MAXLEN },
4540         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4541         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4542                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4543         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4544 };
4545
4546 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4547         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4548                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4549         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4550                                             .len = NFT_SET_MAXNAMELEN - 1 },
4551         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4552         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4553 };
4554
4555 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4556                                       const struct sk_buff *skb,
4557                                       const struct nlmsghdr *nlh,
4558                                       const struct nlattr * const nla[],
4559                                       struct netlink_ext_ack *extack,
4560                                       u8 genmask)
4561 {
4562         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4563         int family = nfmsg->nfgen_family;
4564         struct nft_table *table;
4565
4566         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4567                                  genmask);
4568         if (IS_ERR(table)) {
4569                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4570                 return PTR_ERR(table);
4571         }
4572
4573         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4574         return 0;
4575 }
4576
4577 static int nf_tables_fill_setelem(struct sk_buff *skb,
4578                                   const struct nft_set *set,
4579                                   const struct nft_set_elem *elem)
4580 {
4581         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4582         unsigned char *b = skb_tail_pointer(skb);
4583         struct nlattr *nest;
4584
4585         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4586         if (nest == NULL)
4587                 goto nla_put_failure;
4588
4589         if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4590                           NFT_DATA_VALUE, set->klen) < 0)
4591                 goto nla_put_failure;
4592
4593         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4594             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4595                           NFT_DATA_VALUE, set->klen) < 0)
4596                 goto nla_put_failure;
4597
4598         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4599             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4600                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4601                           set->dlen) < 0)
4602                 goto nla_put_failure;
4603
4604         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
4605             nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
4606                 goto nla_put_failure;
4607
4608         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4609             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4610                            (*nft_set_ext_obj(ext))->key.name) < 0)
4611                 goto nla_put_failure;
4612
4613         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4614             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4615                          htonl(*nft_set_ext_flags(ext))))
4616                 goto nla_put_failure;
4617
4618         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4619             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4620                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4621                          NFTA_SET_ELEM_PAD))
4622                 goto nla_put_failure;
4623
4624         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4625                 u64 expires, now = get_jiffies_64();
4626
4627                 expires = *nft_set_ext_expiration(ext);
4628                 if (time_before64(now, expires))
4629                         expires -= now;
4630                 else
4631                         expires = 0;
4632
4633                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4634                                  nf_jiffies64_to_msecs(expires),
4635                                  NFTA_SET_ELEM_PAD))
4636                         goto nla_put_failure;
4637         }
4638
4639         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4640                 struct nft_userdata *udata;
4641
4642                 udata = nft_set_ext_userdata(ext);
4643                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4644                             udata->len + 1, udata->data))
4645                         goto nla_put_failure;
4646         }
4647
4648         nla_nest_end(skb, nest);
4649         return 0;
4650
4651 nla_put_failure:
4652         nlmsg_trim(skb, b);
4653         return -EMSGSIZE;
4654 }
4655
4656 struct nft_set_dump_args {
4657         const struct netlink_callback   *cb;
4658         struct nft_set_iter             iter;
4659         struct sk_buff                  *skb;
4660 };
4661
4662 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4663                                   struct nft_set *set,
4664                                   const struct nft_set_iter *iter,
4665                                   struct nft_set_elem *elem)
4666 {
4667         struct nft_set_dump_args *args;
4668
4669         args = container_of(iter, struct nft_set_dump_args, iter);
4670         return nf_tables_fill_setelem(args->skb, set, elem);
4671 }
4672
4673 struct nft_set_dump_ctx {
4674         const struct nft_set    *set;
4675         struct nft_ctx          ctx;
4676 };
4677
4678 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4679 {
4680         struct nft_set_dump_ctx *dump_ctx = cb->data;
4681         struct net *net = sock_net(skb->sk);
4682         struct nft_table *table;
4683         struct nft_set *set;
4684         struct nft_set_dump_args args;
4685         bool set_found = false;
4686         struct nfgenmsg *nfmsg;
4687         struct nlmsghdr *nlh;
4688         struct nlattr *nest;
4689         u32 portid, seq;
4690         int event;
4691
4692         rcu_read_lock();
4693         list_for_each_entry_rcu(table, &net->nft.tables, list) {
4694                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4695                     dump_ctx->ctx.family != table->family)
4696                         continue;
4697
4698                 if (table != dump_ctx->ctx.table)
4699                         continue;
4700
4701                 list_for_each_entry_rcu(set, &table->sets, list) {
4702                         if (set == dump_ctx->set) {
4703                                 set_found = true;
4704                                 break;
4705                         }
4706                 }
4707                 break;
4708         }
4709
4710         if (!set_found) {
4711                 rcu_read_unlock();
4712                 return -ENOENT;
4713         }
4714
4715         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4716         portid = NETLINK_CB(cb->skb).portid;
4717         seq    = cb->nlh->nlmsg_seq;
4718
4719         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4720                         NLM_F_MULTI);
4721         if (nlh == NULL)
4722                 goto nla_put_failure;
4723
4724         nfmsg = nlmsg_data(nlh);
4725         nfmsg->nfgen_family = table->family;
4726         nfmsg->version      = NFNETLINK_V0;
4727         nfmsg->res_id       = htons(net->nft.base_seq & 0xffff);
4728
4729         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4730                 goto nla_put_failure;
4731         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4732                 goto nla_put_failure;
4733
4734         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4735         if (nest == NULL)
4736                 goto nla_put_failure;
4737
4738         args.cb                 = cb;
4739         args.skb                = skb;
4740         args.iter.genmask       = nft_genmask_cur(net);
4741         args.iter.skip          = cb->args[0];
4742         args.iter.count         = 0;
4743         args.iter.err           = 0;
4744         args.iter.fn            = nf_tables_dump_setelem;
4745         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4746         rcu_read_unlock();
4747
4748         nla_nest_end(skb, nest);
4749         nlmsg_end(skb, nlh);
4750
4751         if (args.iter.err && args.iter.err != -EMSGSIZE)
4752                 return args.iter.err;
4753         if (args.iter.count == cb->args[0])
4754                 return 0;
4755
4756         cb->args[0] = args.iter.count;
4757         return skb->len;
4758
4759 nla_put_failure:
4760         rcu_read_unlock();
4761         return -ENOSPC;
4762 }
4763
4764 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4765 {
4766         struct nft_set_dump_ctx *dump_ctx = cb->data;
4767
4768         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4769
4770         return cb->data ? 0 : -ENOMEM;
4771 }
4772
4773 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4774 {
4775         kfree(cb->data);
4776         return 0;
4777 }
4778
4779 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4780                                        const struct nft_ctx *ctx, u32 seq,
4781                                        u32 portid, int event, u16 flags,
4782                                        const struct nft_set *set,
4783                                        const struct nft_set_elem *elem)
4784 {
4785         struct nfgenmsg *nfmsg;
4786         struct nlmsghdr *nlh;
4787         struct nlattr *nest;
4788         int err;
4789
4790         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4791         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4792                         flags);
4793         if (nlh == NULL)
4794                 goto nla_put_failure;
4795
4796         nfmsg = nlmsg_data(nlh);
4797         nfmsg->nfgen_family     = ctx->family;
4798         nfmsg->version          = NFNETLINK_V0;
4799         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
4800
4801         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4802                 goto nla_put_failure;
4803         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4804                 goto nla_put_failure;
4805
4806         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4807         if (nest == NULL)
4808                 goto nla_put_failure;
4809
4810         err = nf_tables_fill_setelem(skb, set, elem);
4811         if (err < 0)
4812                 goto nla_put_failure;
4813
4814         nla_nest_end(skb, nest);
4815
4816         nlmsg_end(skb, nlh);
4817         return 0;
4818
4819 nla_put_failure:
4820         nlmsg_trim(skb, nlh);
4821         return -1;
4822 }
4823
4824 static int nft_setelem_parse_flags(const struct nft_set *set,
4825                                    const struct nlattr *attr, u32 *flags)
4826 {
4827         if (attr == NULL)
4828                 return 0;
4829
4830         *flags = ntohl(nla_get_be32(attr));
4831         if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4832                 return -EINVAL;
4833         if (!(set->flags & NFT_SET_INTERVAL) &&
4834             *flags & NFT_SET_ELEM_INTERVAL_END)
4835                 return -EINVAL;
4836
4837         return 0;
4838 }
4839
4840 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4841                                  struct nft_data *key, struct nlattr *attr)
4842 {
4843         struct nft_data_desc desc;
4844         int err;
4845
4846         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4847         if (err < 0)
4848                 return err;
4849
4850         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4851                 nft_data_release(key, desc.type);
4852                 return -EINVAL;
4853         }
4854
4855         return 0;
4856 }
4857
4858 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4859                                   struct nft_data_desc *desc,
4860                                   struct nft_data *data,
4861                                   struct nlattr *attr)
4862 {
4863         int err;
4864
4865         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4866         if (err < 0)
4867                 return err;
4868
4869         if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4870                 nft_data_release(data, desc->type);
4871                 return -EINVAL;
4872         }
4873
4874         return 0;
4875 }
4876
4877 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4878                             const struct nlattr *attr)
4879 {
4880         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4881         struct nft_set_elem elem;
4882         struct sk_buff *skb;
4883         uint32_t flags = 0;
4884         void *priv;
4885         int err;
4886
4887         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4888                                           nft_set_elem_policy, NULL);
4889         if (err < 0)
4890                 return err;
4891
4892         if (!nla[NFTA_SET_ELEM_KEY])
4893                 return -EINVAL;
4894
4895         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4896         if (err < 0)
4897                 return err;
4898
4899         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4900                                     nla[NFTA_SET_ELEM_KEY]);
4901         if (err < 0)
4902                 return err;
4903
4904         if (nla[NFTA_SET_ELEM_KEY_END]) {
4905                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4906                                             nla[NFTA_SET_ELEM_KEY_END]);
4907                 if (err < 0)
4908                         return err;
4909         }
4910
4911         priv = set->ops->get(ctx->net, set, &elem, flags);
4912         if (IS_ERR(priv))
4913                 return PTR_ERR(priv);
4914
4915         elem.priv = priv;
4916
4917         err = -ENOMEM;
4918         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4919         if (skb == NULL)
4920                 return err;
4921
4922         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4923                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
4924         if (err < 0)
4925                 goto err_fill_setelem;
4926
4927         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
4928
4929 err_fill_setelem:
4930         kfree_skb(skb);
4931         return err;
4932 }
4933
4934 /* called with rcu_read_lock held */
4935 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4936                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
4937                                 const struct nlattr * const nla[],
4938                                 struct netlink_ext_ack *extack)
4939 {
4940         u8 genmask = nft_genmask_cur(net);
4941         struct nft_set *set;
4942         struct nlattr *attr;
4943         struct nft_ctx ctx;
4944         int rem, err = 0;
4945
4946         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4947                                          genmask);
4948         if (err < 0)
4949                 return err;
4950
4951         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4952         if (IS_ERR(set))
4953                 return PTR_ERR(set);
4954
4955         if (nlh->nlmsg_flags & NLM_F_DUMP) {
4956                 struct netlink_dump_control c = {
4957                         .start = nf_tables_dump_set_start,
4958                         .dump = nf_tables_dump_set,
4959                         .done = nf_tables_dump_set_done,
4960                         .module = THIS_MODULE,
4961                 };
4962                 struct nft_set_dump_ctx dump_ctx = {
4963                         .set = set,
4964                         .ctx = ctx,
4965                 };
4966
4967                 c.data = &dump_ctx;
4968                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4969         }
4970
4971         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4972                 return -EINVAL;
4973
4974         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4975                 err = nft_get_set_elem(&ctx, set, attr);
4976                 if (err < 0)
4977                         break;
4978         }
4979
4980         return err;
4981 }
4982
4983 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4984                                      const struct nft_set *set,
4985                                      const struct nft_set_elem *elem,
4986                                      int event, u16 flags)
4987 {
4988         struct net *net = ctx->net;
4989         u32 portid = ctx->portid;
4990         struct sk_buff *skb;
4991         int err;
4992         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
4993                               ctx->table->name, ctx->table->handle,
4994                               set->name, set->handle);
4995
4996         audit_log_nfcfg(buf,
4997                         ctx->family,
4998                         set->handle,
4999                         event == NFT_MSG_NEWSETELEM ?
5000                                 AUDIT_NFT_OP_SETELEM_REGISTER :
5001                                 AUDIT_NFT_OP_SETELEM_UNREGISTER,
5002                         GFP_KERNEL);
5003         kfree(buf);
5004
5005         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5006                 return;
5007
5008         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5009         if (skb == NULL)
5010                 goto err;
5011
5012         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5013                                           set, elem);
5014         if (err < 0) {
5015                 kfree_skb(skb);
5016                 goto err;
5017         }
5018
5019         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
5020         return;
5021 err:
5022         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5023 }
5024
5025 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5026                                               int msg_type,
5027                                               struct nft_set *set)
5028 {
5029         struct nft_trans *trans;
5030
5031         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5032         if (trans == NULL)
5033                 return NULL;
5034
5035         nft_trans_elem_set(trans) = set;
5036         return trans;
5037 }
5038
5039 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5040                                          const struct nft_set *set,
5041                                          const struct nlattr *attr)
5042 {
5043         struct nft_expr *expr;
5044         int err;
5045
5046         expr = nft_expr_init(ctx, attr);
5047         if (IS_ERR(expr))
5048                 return expr;
5049
5050         err = -EOPNOTSUPP;
5051         if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5052                 goto err_set_elem_expr;
5053
5054         if (expr->ops->type->flags & NFT_EXPR_GC) {
5055                 if (set->flags & NFT_SET_TIMEOUT)
5056                         goto err_set_elem_expr;
5057                 if (!set->ops->gc_init)
5058                         goto err_set_elem_expr;
5059                 set->ops->gc_init(set);
5060         }
5061
5062         return expr;
5063
5064 err_set_elem_expr:
5065         nft_expr_destroy(ctx, expr);
5066         return ERR_PTR(err);
5067 }
5068
5069 void *nft_set_elem_init(const struct nft_set *set,
5070                         const struct nft_set_ext_tmpl *tmpl,
5071                         const u32 *key, const u32 *key_end,
5072                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5073 {
5074         struct nft_set_ext *ext;
5075         void *elem;
5076
5077         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5078         if (elem == NULL)
5079                 return NULL;
5080
5081         ext = nft_set_elem_ext(set, elem);
5082         nft_set_ext_init(ext, tmpl);
5083
5084         memcpy(nft_set_ext_key(ext), key, set->klen);
5085         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5086                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5087         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5088                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5089         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5090                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5091                 if (expiration == 0)
5092                         *nft_set_ext_expiration(ext) += timeout;
5093         }
5094         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5095                 *nft_set_ext_timeout(ext) = timeout;
5096
5097         return elem;
5098 }
5099
5100 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5101                                       struct nft_expr *expr)
5102 {
5103         if (expr->ops->destroy_clone) {
5104                 expr->ops->destroy_clone(ctx, expr);
5105                 module_put(expr->ops->type->owner);
5106         } else {
5107                 nf_tables_expr_destroy(ctx, expr);
5108         }
5109 }
5110
5111 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5112                           bool destroy_expr)
5113 {
5114         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5115         struct nft_ctx ctx = {
5116                 .net    = read_pnet(&set->net),
5117                 .family = set->table->family,
5118         };
5119
5120         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5121         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5122                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5123         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5124                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5125
5126         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5127                 (*nft_set_ext_obj(ext))->use--;
5128         kfree(elem);
5129 }
5130 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5131
5132 /* Only called from commit path, nft_set_elem_deactivate() already deals with
5133  * the refcounting from the preparation phase.
5134  */
5135 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5136                                        const struct nft_set *set, void *elem)
5137 {
5138         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5139
5140         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5141                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5142
5143         kfree(elem);
5144 }
5145
5146 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5147                             const struct nlattr *attr, u32 nlmsg_flags)
5148 {
5149         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5150         u8 genmask = nft_genmask_next(ctx->net);
5151         struct nft_set_ext_tmpl tmpl;
5152         struct nft_set_ext *ext, *ext2;
5153         struct nft_set_elem elem;
5154         struct nft_set_binding *binding;
5155         struct nft_object *obj = NULL;
5156         struct nft_expr *expr = NULL;
5157         struct nft_userdata *udata;
5158         struct nft_data_desc desc;
5159         enum nft_registers dreg;
5160         struct nft_trans *trans;
5161         u32 flags = 0;
5162         u64 timeout;
5163         u64 expiration;
5164         u8 ulen;
5165         int err;
5166
5167         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5168                                           nft_set_elem_policy, NULL);
5169         if (err < 0)
5170                 return err;
5171
5172         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5173                 return -EINVAL;
5174
5175         nft_set_ext_prepare(&tmpl);
5176
5177         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5178         if (err < 0)
5179                 return err;
5180         if (flags != 0)
5181                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5182
5183         if (set->flags & NFT_SET_MAP) {
5184                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5185                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5186                         return -EINVAL;
5187         } else {
5188                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5189                         return -EINVAL;
5190         }
5191
5192         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5193              (nla[NFTA_SET_ELEM_DATA] ||
5194               nla[NFTA_SET_ELEM_OBJREF] ||
5195               nla[NFTA_SET_ELEM_TIMEOUT] ||
5196               nla[NFTA_SET_ELEM_EXPIRATION] ||
5197               nla[NFTA_SET_ELEM_USERDATA] ||
5198               nla[NFTA_SET_ELEM_EXPR]))
5199                 return -EINVAL;
5200
5201         timeout = 0;
5202         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5203                 if (!(set->flags & NFT_SET_TIMEOUT))
5204                         return -EINVAL;
5205                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5206                                             &timeout);
5207                 if (err)
5208                         return err;
5209         } else if (set->flags & NFT_SET_TIMEOUT) {
5210                 timeout = set->timeout;
5211         }
5212
5213         expiration = 0;
5214         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5215                 if (!(set->flags & NFT_SET_TIMEOUT))
5216                         return -EINVAL;
5217                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5218                                             &expiration);
5219                 if (err)
5220                         return err;
5221         }
5222
5223         if (nla[NFTA_SET_ELEM_EXPR] != NULL) {
5224                 expr = nft_set_elem_expr_alloc(ctx, set,
5225                                                nla[NFTA_SET_ELEM_EXPR]);
5226                 if (IS_ERR(expr))
5227                         return PTR_ERR(expr);
5228
5229                 err = -EOPNOTSUPP;
5230                 if (set->expr && set->expr->ops != expr->ops)
5231                         goto err_set_elem_expr;
5232         } else if (set->expr) {
5233                 expr = kzalloc(set->expr->ops->size, GFP_KERNEL);
5234                 if (!expr)
5235                         return -ENOMEM;
5236
5237                 err = nft_expr_clone(expr, set->expr);
5238                 if (err < 0)
5239                         goto err_set_elem_expr;
5240         }
5241
5242         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5243                                     nla[NFTA_SET_ELEM_KEY]);
5244         if (err < 0)
5245                 goto err_set_elem_expr;
5246
5247         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5248
5249         if (nla[NFTA_SET_ELEM_KEY_END]) {
5250                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5251                                             nla[NFTA_SET_ELEM_KEY_END]);
5252                 if (err < 0)
5253                         goto err_parse_key;
5254
5255                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5256         }
5257
5258         if (timeout > 0) {
5259                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5260                 if (timeout != set->timeout)
5261                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5262         }
5263
5264         if (expr)
5265                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPR,
5266                                        expr->ops->size);
5267
5268         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5269                 if (!(set->flags & NFT_SET_OBJECT)) {
5270                         err = -EINVAL;
5271                         goto err_parse_key_end;
5272                 }
5273                 obj = nft_obj_lookup(ctx->net, ctx->table,
5274                                      nla[NFTA_SET_ELEM_OBJREF],
5275                                      set->objtype, genmask);
5276                 if (IS_ERR(obj)) {
5277                         err = PTR_ERR(obj);
5278                         goto err_parse_key_end;
5279                 }
5280                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5281         }
5282
5283         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5284                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5285                                              nla[NFTA_SET_ELEM_DATA]);
5286                 if (err < 0)
5287                         goto err_parse_key_end;
5288
5289                 dreg = nft_type_to_reg(set->dtype);
5290                 list_for_each_entry(binding, &set->bindings, list) {
5291                         struct nft_ctx bind_ctx = {
5292                                 .net    = ctx->net,
5293                                 .family = ctx->family,
5294                                 .table  = ctx->table,
5295                                 .chain  = (struct nft_chain *)binding->chain,
5296                         };
5297
5298                         if (!(binding->flags & NFT_SET_MAP))
5299                                 continue;
5300
5301                         err = nft_validate_register_store(&bind_ctx, dreg,
5302                                                           &elem.data.val,
5303                                                           desc.type, desc.len);
5304                         if (err < 0)
5305                                 goto err_parse_data;
5306
5307                         if (desc.type == NFT_DATA_VERDICT &&
5308                             (elem.data.val.verdict.code == NFT_GOTO ||
5309                              elem.data.val.verdict.code == NFT_JUMP))
5310                                 nft_validate_state_update(ctx->net,
5311                                                           NFT_VALIDATE_NEED);
5312                 }
5313
5314                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5315         }
5316
5317         /* The full maximum length of userdata can exceed the maximum
5318          * offset value (U8_MAX) for following extensions, therefor it
5319          * must be the last extension added.
5320          */
5321         ulen = 0;
5322         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5323                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5324                 if (ulen > 0)
5325                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5326                                                ulen);
5327         }
5328
5329         err = -ENOMEM;
5330         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5331                                       elem.key_end.val.data, elem.data.val.data,
5332                                       timeout, expiration, GFP_KERNEL);
5333         if (elem.priv == NULL)
5334                 goto err_parse_data;
5335
5336         ext = nft_set_elem_ext(set, elem.priv);
5337         if (flags)
5338                 *nft_set_ext_flags(ext) = flags;
5339         if (ulen > 0) {
5340                 udata = nft_set_ext_userdata(ext);
5341                 udata->len = ulen - 1;
5342                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5343         }
5344         if (obj) {
5345                 *nft_set_ext_obj(ext) = obj;
5346                 obj->use++;
5347         }
5348         if (expr) {
5349                 memcpy(nft_set_ext_expr(ext), expr, expr->ops->size);
5350                 kfree(expr);
5351                 expr = NULL;
5352         }
5353
5354         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5355         if (trans == NULL)
5356                 goto err_trans;
5357
5358         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5359         err = set->ops->insert(ctx->net, set, &elem, &ext2);
5360         if (err) {
5361                 if (err == -EEXIST) {
5362                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5363                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5364                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5365                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5366                                 goto err_element_clash;
5367                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5368                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5369                              memcmp(nft_set_ext_data(ext),
5370                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
5371                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5372                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5373                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5374                                 goto err_element_clash;
5375                         else if (!(nlmsg_flags & NLM_F_EXCL))
5376                                 err = 0;
5377                 } else if (err == -ENOTEMPTY) {
5378                         /* ENOTEMPTY reports overlapping between this element
5379                          * and an existing one.
5380                          */
5381                         err = -EEXIST;
5382                 }
5383                 goto err_element_clash;
5384         }
5385
5386         if (set->size &&
5387             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5388                 err = -ENFILE;
5389                 goto err_set_full;
5390         }
5391
5392         nft_trans_elem(trans) = elem;
5393         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5394         return 0;
5395
5396 err_set_full:
5397         set->ops->remove(ctx->net, set, &elem);
5398 err_element_clash:
5399         kfree(trans);
5400 err_trans:
5401         if (obj)
5402                 obj->use--;
5403
5404         nf_tables_set_elem_destroy(ctx, set, elem.priv);
5405 err_parse_data:
5406         if (nla[NFTA_SET_ELEM_DATA] != NULL)
5407                 nft_data_release(&elem.data.val, desc.type);
5408 err_parse_key_end:
5409         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5410 err_parse_key:
5411         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5412 err_set_elem_expr:
5413         if (expr != NULL)
5414                 nft_expr_destroy(ctx, expr);
5415
5416         return err;
5417 }
5418
5419 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5420                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5421                                 const struct nlattr * const nla[],
5422                                 struct netlink_ext_ack *extack)
5423 {
5424         u8 genmask = nft_genmask_next(net);
5425         const struct nlattr *attr;
5426         struct nft_set *set;
5427         struct nft_ctx ctx;
5428         int rem, err;
5429
5430         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5431                 return -EINVAL;
5432
5433         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5434                                          genmask);
5435         if (err < 0)
5436                 return err;
5437
5438         set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5439                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5440         if (IS_ERR(set))
5441                 return PTR_ERR(set);
5442
5443         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5444                 return -EBUSY;
5445
5446         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5447                 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5448                 if (err < 0)
5449                         return err;
5450         }
5451
5452         if (net->nft.validate_state == NFT_VALIDATE_DO)
5453                 return nft_table_validate(net, ctx.table);
5454
5455         return 0;
5456 }
5457
5458 /**
5459  *      nft_data_hold - hold a nft_data item
5460  *
5461  *      @data: struct nft_data to release
5462  *      @type: type of data
5463  *
5464  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5465  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5466  *      NFT_GOTO verdicts. This function must be called on active data objects
5467  *      from the second phase of the commit protocol.
5468  */
5469 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5470 {
5471         struct nft_chain *chain;
5472         struct nft_rule *rule;
5473
5474         if (type == NFT_DATA_VERDICT) {
5475                 switch (data->verdict.code) {
5476                 case NFT_JUMP:
5477                 case NFT_GOTO:
5478                         chain = data->verdict.chain;
5479                         chain->use++;
5480
5481                         if (!nft_chain_is_bound(chain))
5482                                 break;
5483
5484                         chain->table->use++;
5485                         list_for_each_entry(rule, &chain->rules, list)
5486                                 chain->use++;
5487
5488                         nft_chain_add(chain->table, chain);
5489                         break;
5490                 }
5491         }
5492 }
5493
5494 static void nft_set_elem_activate(const struct net *net,
5495                                   const struct nft_set *set,
5496                                   struct nft_set_elem *elem)
5497 {
5498         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5499
5500         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5501                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5502         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5503                 (*nft_set_ext_obj(ext))->use++;
5504 }
5505
5506 static void nft_set_elem_deactivate(const struct net *net,
5507                                     const struct nft_set *set,
5508                                     struct nft_set_elem *elem)
5509 {
5510         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5511
5512         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5513                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5514         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5515                 (*nft_set_ext_obj(ext))->use--;
5516 }
5517
5518 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5519                            const struct nlattr *attr)
5520 {
5521         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5522         struct nft_set_ext_tmpl tmpl;
5523         struct nft_set_elem elem;
5524         struct nft_set_ext *ext;
5525         struct nft_trans *trans;
5526         u32 flags = 0;
5527         void *priv;
5528         int err;
5529
5530         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5531                                           nft_set_elem_policy, NULL);
5532         if (err < 0)
5533                 return err;
5534
5535         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5536                 return -EINVAL;
5537
5538         nft_set_ext_prepare(&tmpl);
5539
5540         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5541         if (err < 0)
5542                 return err;
5543         if (flags != 0)
5544                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5545
5546         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5547                                     nla[NFTA_SET_ELEM_KEY]);
5548         if (err < 0)
5549                 return err;
5550
5551         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5552
5553         if (nla[NFTA_SET_ELEM_KEY_END]) {
5554                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5555                                             nla[NFTA_SET_ELEM_KEY_END]);
5556                 if (err < 0)
5557                         return err;
5558
5559                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5560         }
5561
5562         err = -ENOMEM;
5563         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5564                                       elem.key_end.val.data, NULL, 0, 0,
5565                                       GFP_KERNEL);
5566         if (elem.priv == NULL)
5567                 goto fail_elem;
5568
5569         ext = nft_set_elem_ext(set, elem.priv);
5570         if (flags)
5571                 *nft_set_ext_flags(ext) = flags;
5572
5573         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5574         if (trans == NULL)
5575                 goto fail_trans;
5576
5577         priv = set->ops->deactivate(ctx->net, set, &elem);
5578         if (priv == NULL) {
5579                 err = -ENOENT;
5580                 goto fail_ops;
5581         }
5582         kfree(elem.priv);
5583         elem.priv = priv;
5584
5585         nft_set_elem_deactivate(ctx->net, set, &elem);
5586
5587         nft_trans_elem(trans) = elem;
5588         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5589         return 0;
5590
5591 fail_ops:
5592         kfree(trans);
5593 fail_trans:
5594         kfree(elem.priv);
5595 fail_elem:
5596         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5597         return err;
5598 }
5599
5600 static int nft_flush_set(const struct nft_ctx *ctx,
5601                          struct nft_set *set,
5602                          const struct nft_set_iter *iter,
5603                          struct nft_set_elem *elem)
5604 {
5605         struct nft_trans *trans;
5606         int err;
5607
5608         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5609                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
5610         if (!trans)
5611                 return -ENOMEM;
5612
5613         if (!set->ops->flush(ctx->net, set, elem->priv)) {
5614                 err = -ENOENT;
5615                 goto err1;
5616         }
5617         set->ndeact++;
5618
5619         nft_set_elem_deactivate(ctx->net, set, elem);
5620         nft_trans_elem_set(trans) = set;
5621         nft_trans_elem(trans) = *elem;
5622         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5623
5624         return 0;
5625 err1:
5626         kfree(trans);
5627         return err;
5628 }
5629
5630 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5631                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5632                                 const struct nlattr * const nla[],
5633                                 struct netlink_ext_ack *extack)
5634 {
5635         u8 genmask = nft_genmask_next(net);
5636         const struct nlattr *attr;
5637         struct nft_set *set;
5638         struct nft_ctx ctx;
5639         int rem, err = 0;
5640
5641         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5642                                          genmask);
5643         if (err < 0)
5644                 return err;
5645
5646         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5647         if (IS_ERR(set))
5648                 return PTR_ERR(set);
5649         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5650                 return -EBUSY;
5651
5652         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5653                 struct nft_set_iter iter = {
5654                         .genmask        = genmask,
5655                         .fn             = nft_flush_set,
5656                 };
5657                 set->ops->walk(&ctx, set, &iter);
5658
5659                 return iter.err;
5660         }
5661
5662         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5663                 err = nft_del_setelem(&ctx, set, attr);
5664                 if (err < 0)
5665                         break;
5666
5667                 set->ndeact++;
5668         }
5669         return err;
5670 }
5671
5672 void nft_set_gc_batch_release(struct rcu_head *rcu)
5673 {
5674         struct nft_set_gc_batch *gcb;
5675         unsigned int i;
5676
5677         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5678         for (i = 0; i < gcb->head.cnt; i++)
5679                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5680         kfree(gcb);
5681 }
5682
5683 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5684                                                 gfp_t gfp)
5685 {
5686         struct nft_set_gc_batch *gcb;
5687
5688         gcb = kzalloc(sizeof(*gcb), gfp);
5689         if (gcb == NULL)
5690                 return gcb;
5691         gcb->head.set = set;
5692         return gcb;
5693 }
5694
5695 /*
5696  * Stateful objects
5697  */
5698
5699 /**
5700  *      nft_register_obj- register nf_tables stateful object type
5701  *      @obj_type: object type
5702  *
5703  *      Registers the object type for use with nf_tables. Returns zero on
5704  *      success or a negative errno code otherwise.
5705  */
5706 int nft_register_obj(struct nft_object_type *obj_type)
5707 {
5708         if (obj_type->type == NFT_OBJECT_UNSPEC)
5709                 return -EINVAL;
5710
5711         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5712         list_add_rcu(&obj_type->list, &nf_tables_objects);
5713         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5714         return 0;
5715 }
5716 EXPORT_SYMBOL_GPL(nft_register_obj);
5717
5718 /**
5719  *      nft_unregister_obj - unregister nf_tables object type
5720  *      @obj_type: object type
5721  *
5722  *      Unregisters the object type for use with nf_tables.
5723  */
5724 void nft_unregister_obj(struct nft_object_type *obj_type)
5725 {
5726         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5727         list_del_rcu(&obj_type->list);
5728         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5729 }
5730 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5731
5732 struct nft_object *nft_obj_lookup(const struct net *net,
5733                                   const struct nft_table *table,
5734                                   const struct nlattr *nla, u32 objtype,
5735                                   u8 genmask)
5736 {
5737         struct nft_object_hash_key k = { .table = table };
5738         char search[NFT_OBJ_MAXNAMELEN];
5739         struct rhlist_head *tmp, *list;
5740         struct nft_object *obj;
5741
5742         nla_strlcpy(search, nla, sizeof(search));
5743         k.name = search;
5744
5745         WARN_ON_ONCE(!rcu_read_lock_held() &&
5746                      !lockdep_commit_lock_is_held(net));
5747
5748         rcu_read_lock();
5749         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5750         if (!list)
5751                 goto out;
5752
5753         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5754                 if (objtype == obj->ops->type->type &&
5755                     nft_active_genmask(obj, genmask)) {
5756                         rcu_read_unlock();
5757                         return obj;
5758                 }
5759         }
5760 out:
5761         rcu_read_unlock();
5762         return ERR_PTR(-ENOENT);
5763 }
5764 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5765
5766 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5767                                                   const struct nlattr *nla,
5768                                                   u32 objtype, u8 genmask)
5769 {
5770         struct nft_object *obj;
5771
5772         list_for_each_entry(obj, &table->objects, list) {
5773                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5774                     objtype == obj->ops->type->type &&
5775                     nft_active_genmask(obj, genmask))
5776                         return obj;
5777         }
5778         return ERR_PTR(-ENOENT);
5779 }
5780
5781 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5782         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
5783                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
5784         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
5785                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
5786         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
5787         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
5788         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
5789         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
5790                                     .len = NFT_USERDATA_MAXLEN },
5791 };
5792
5793 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5794                                        const struct nft_object_type *type,
5795                                        const struct nlattr *attr)
5796 {
5797         struct nlattr **tb;
5798         const struct nft_object_ops *ops;
5799         struct nft_object *obj;
5800         int err = -ENOMEM;
5801
5802         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5803         if (!tb)
5804                 goto err1;
5805
5806         if (attr) {
5807                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5808                                                   type->policy, NULL);
5809                 if (err < 0)
5810                         goto err2;
5811         } else {
5812                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5813         }
5814
5815         if (type->select_ops) {
5816                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5817                 if (IS_ERR(ops)) {
5818                         err = PTR_ERR(ops);
5819                         goto err2;
5820                 }
5821         } else {
5822                 ops = type->ops;
5823         }
5824
5825         err = -ENOMEM;
5826         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5827         if (!obj)
5828                 goto err2;
5829
5830         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5831         if (err < 0)
5832                 goto err3;
5833
5834         obj->ops = ops;
5835
5836         kfree(tb);
5837         return obj;
5838 err3:
5839         kfree(obj);
5840 err2:
5841         kfree(tb);
5842 err1:
5843         return ERR_PTR(err);
5844 }
5845
5846 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5847                            struct nft_object *obj, bool reset)
5848 {
5849         struct nlattr *nest;
5850
5851         nest = nla_nest_start_noflag(skb, attr);
5852         if (!nest)
5853                 goto nla_put_failure;
5854         if (obj->ops->dump(skb, obj, reset) < 0)
5855                 goto nla_put_failure;
5856         nla_nest_end(skb, nest);
5857         return 0;
5858
5859 nla_put_failure:
5860         return -1;
5861 }
5862
5863 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5864 {
5865         const struct nft_object_type *type;
5866
5867         list_for_each_entry(type, &nf_tables_objects, list) {
5868                 if (objtype == type->type)
5869                         return type;
5870         }
5871         return NULL;
5872 }
5873
5874 static const struct nft_object_type *
5875 nft_obj_type_get(struct net *net, u32 objtype)
5876 {
5877         const struct nft_object_type *type;
5878
5879         type = __nft_obj_type_get(objtype);
5880         if (type != NULL && try_module_get(type->owner))
5881                 return type;
5882
5883         lockdep_nfnl_nft_mutex_not_held();
5884 #ifdef CONFIG_MODULES
5885         if (type == NULL) {
5886                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
5887                         return ERR_PTR(-EAGAIN);
5888         }
5889 #endif
5890         return ERR_PTR(-ENOENT);
5891 }
5892
5893 static int nf_tables_updobj(const struct nft_ctx *ctx,
5894                             const struct nft_object_type *type,
5895                             const struct nlattr *attr,
5896                             struct nft_object *obj)
5897 {
5898         struct nft_object *newobj;
5899         struct nft_trans *trans;
5900         int err;
5901
5902         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
5903                                 sizeof(struct nft_trans_obj));
5904         if (!trans)
5905                 return -ENOMEM;
5906
5907         newobj = nft_obj_init(ctx, type, attr);
5908         if (IS_ERR(newobj)) {
5909                 err = PTR_ERR(newobj);
5910                 goto err_free_trans;
5911         }
5912
5913         nft_trans_obj(trans) = obj;
5914         nft_trans_obj_update(trans) = true;
5915         nft_trans_obj_newobj(trans) = newobj;
5916         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5917
5918         return 0;
5919
5920 err_free_trans:
5921         kfree(trans);
5922         return err;
5923 }
5924
5925 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5926                             struct sk_buff *skb, const struct nlmsghdr *nlh,
5927                             const struct nlattr * const nla[],
5928                             struct netlink_ext_ack *extack)
5929 {
5930         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5931         const struct nft_object_type *type;
5932         u8 genmask = nft_genmask_next(net);
5933         int family = nfmsg->nfgen_family;
5934         struct nft_table *table;
5935         struct nft_object *obj;
5936         struct nft_ctx ctx;
5937         u32 objtype;
5938         int err;
5939
5940         if (!nla[NFTA_OBJ_TYPE] ||
5941             !nla[NFTA_OBJ_NAME] ||
5942             !nla[NFTA_OBJ_DATA])
5943                 return -EINVAL;
5944
5945         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5946         if (IS_ERR(table)) {
5947                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5948                 return PTR_ERR(table);
5949         }
5950
5951         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5952         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5953         if (IS_ERR(obj)) {
5954                 err = PTR_ERR(obj);
5955                 if (err != -ENOENT) {
5956                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5957                         return err;
5958                 }
5959         } else {
5960                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5961                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5962                         return -EEXIST;
5963                 }
5964                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
5965                         return -EOPNOTSUPP;
5966
5967                 type = __nft_obj_type_get(objtype);
5968                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5969
5970                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
5971         }
5972
5973         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5974
5975         type = nft_obj_type_get(net, objtype);
5976         if (IS_ERR(type))
5977                 return PTR_ERR(type);
5978
5979         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5980         if (IS_ERR(obj)) {
5981                 err = PTR_ERR(obj);
5982                 goto err_init;
5983         }
5984         obj->key.table = table;
5985         obj->handle = nf_tables_alloc_handle(table);
5986
5987         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5988         if (!obj->key.name) {
5989                 err = -ENOMEM;
5990                 goto err_strdup;
5991         }
5992
5993         if (nla[NFTA_OBJ_USERDATA]) {
5994                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
5995                 if (obj->udata == NULL)
5996                         goto err_userdata;
5997
5998                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
5999         }
6000
6001         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6002         if (err < 0)
6003                 goto err_trans;
6004
6005         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6006                               nft_objname_ht_params);
6007         if (err < 0)
6008                 goto err_obj_ht;
6009
6010         list_add_tail_rcu(&obj->list, &table->objects);
6011         table->use++;
6012         return 0;
6013 err_obj_ht:
6014         /* queued in transaction log */
6015         INIT_LIST_HEAD(&obj->list);
6016         return err;
6017 err_trans:
6018         kfree(obj->key.name);
6019 err_userdata:
6020         kfree(obj->udata);
6021 err_strdup:
6022         if (obj->ops->destroy)
6023                 obj->ops->destroy(&ctx, obj);
6024         kfree(obj);
6025 err_init:
6026         module_put(type->owner);
6027         return err;
6028 }
6029
6030 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6031                                    u32 portid, u32 seq, int event, u32 flags,
6032                                    int family, const struct nft_table *table,
6033                                    struct nft_object *obj, bool reset)
6034 {
6035         struct nfgenmsg *nfmsg;
6036         struct nlmsghdr *nlh;
6037
6038         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6039         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6040         if (nlh == NULL)
6041                 goto nla_put_failure;
6042
6043         nfmsg = nlmsg_data(nlh);
6044         nfmsg->nfgen_family     = family;
6045         nfmsg->version          = NFNETLINK_V0;
6046         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
6047
6048         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6049             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6050             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6051             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6052             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6053             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6054                          NFTA_OBJ_PAD))
6055                 goto nla_put_failure;
6056
6057         if (obj->udata &&
6058             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6059                 goto nla_put_failure;
6060
6061         nlmsg_end(skb, nlh);
6062         return 0;
6063
6064 nla_put_failure:
6065         nlmsg_trim(skb, nlh);
6066         return -1;
6067 }
6068
6069 struct nft_obj_filter {
6070         char            *table;
6071         u32             type;
6072 };
6073
6074 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6075 {
6076         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6077         const struct nft_table *table;
6078         unsigned int idx = 0, s_idx = cb->args[0];
6079         struct nft_obj_filter *filter = cb->data;
6080         struct net *net = sock_net(skb->sk);
6081         int family = nfmsg->nfgen_family;
6082         struct nft_object *obj;
6083         bool reset = false;
6084
6085         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6086                 reset = true;
6087
6088         rcu_read_lock();
6089         cb->seq = net->nft.base_seq;
6090
6091         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6092                 if (family != NFPROTO_UNSPEC && family != table->family)
6093                         continue;
6094
6095                 list_for_each_entry_rcu(obj, &table->objects, list) {
6096                         if (!nft_is_active(net, obj))
6097                                 goto cont;
6098                         if (idx < s_idx)
6099                                 goto cont;
6100                         if (idx > s_idx)
6101                                 memset(&cb->args[1], 0,
6102                                        sizeof(cb->args) - sizeof(cb->args[0]));
6103                         if (filter && filter->table &&
6104                             strcmp(filter->table, table->name))
6105                                 goto cont;
6106                         if (filter &&
6107                             filter->type != NFT_OBJECT_UNSPEC &&
6108                             obj->ops->type->type != filter->type)
6109                                 goto cont;
6110
6111                         if (reset) {
6112                                 char *buf = kasprintf(GFP_ATOMIC,
6113                                                       "%s:%llu;?:0",
6114                                                       table->name,
6115                                                       table->handle);
6116
6117                                 audit_log_nfcfg(buf,
6118                                                 family,
6119                                                 obj->handle,
6120                                                 AUDIT_NFT_OP_OBJ_RESET,
6121                                                 GFP_ATOMIC);
6122                                 kfree(buf);
6123                         }
6124
6125                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6126                                                     cb->nlh->nlmsg_seq,
6127                                                     NFT_MSG_NEWOBJ,
6128                                                     NLM_F_MULTI | NLM_F_APPEND,
6129                                                     table->family, table,
6130                                                     obj, reset) < 0)
6131                                 goto done;
6132
6133                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6134 cont:
6135                         idx++;
6136                 }
6137         }
6138 done:
6139         rcu_read_unlock();
6140
6141         cb->args[0] = idx;
6142         return skb->len;
6143 }
6144
6145 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6146 {
6147         const struct nlattr * const *nla = cb->data;
6148         struct nft_obj_filter *filter = NULL;
6149
6150         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6151                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6152                 if (!filter)
6153                         return -ENOMEM;
6154
6155                 if (nla[NFTA_OBJ_TABLE]) {
6156                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6157                         if (!filter->table) {
6158                                 kfree(filter);
6159                                 return -ENOMEM;
6160                         }
6161                 }
6162
6163                 if (nla[NFTA_OBJ_TYPE])
6164                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6165         }
6166
6167         cb->data = filter;
6168         return 0;
6169 }
6170
6171 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6172 {
6173         struct nft_obj_filter *filter = cb->data;
6174
6175         if (filter) {
6176                 kfree(filter->table);
6177                 kfree(filter);
6178         }
6179
6180         return 0;
6181 }
6182
6183 /* called with rcu_read_lock held */
6184 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6185                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6186                             const struct nlattr * const nla[],
6187                             struct netlink_ext_ack *extack)
6188 {
6189         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6190         u8 genmask = nft_genmask_cur(net);
6191         int family = nfmsg->nfgen_family;
6192         const struct nft_table *table;
6193         struct nft_object *obj;
6194         struct sk_buff *skb2;
6195         bool reset = false;
6196         u32 objtype;
6197         int err;
6198
6199         if (nlh->nlmsg_flags & NLM_F_DUMP) {
6200                 struct netlink_dump_control c = {
6201                         .start = nf_tables_dump_obj_start,
6202                         .dump = nf_tables_dump_obj,
6203                         .done = nf_tables_dump_obj_done,
6204                         .module = THIS_MODULE,
6205                         .data = (void *)nla,
6206                 };
6207
6208                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6209         }
6210
6211         if (!nla[NFTA_OBJ_NAME] ||
6212             !nla[NFTA_OBJ_TYPE])
6213                 return -EINVAL;
6214
6215         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6216         if (IS_ERR(table)) {
6217                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6218                 return PTR_ERR(table);
6219         }
6220
6221         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6222         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6223         if (IS_ERR(obj)) {
6224                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6225                 return PTR_ERR(obj);
6226         }
6227
6228         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6229         if (!skb2)
6230                 return -ENOMEM;
6231
6232         if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6233                 reset = true;
6234
6235         if (reset) {
6236                 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
6237                                       table->name, table->handle);
6238
6239                 audit_log_nfcfg(buf,
6240                                 family,
6241                                 obj->handle,
6242                                 AUDIT_NFT_OP_OBJ_RESET,
6243                                 GFP_ATOMIC);
6244                 kfree(buf);
6245         }
6246
6247         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6248                                       nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6249                                       family, table, obj, reset);
6250         if (err < 0)
6251                 goto err_fill_obj_info;
6252
6253         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6254
6255 err_fill_obj_info:
6256         kfree_skb(skb2);
6257         return err;
6258 }
6259
6260 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6261 {
6262         if (obj->ops->destroy)
6263                 obj->ops->destroy(ctx, obj);
6264
6265         module_put(obj->ops->type->owner);
6266         kfree(obj->key.name);
6267         kfree(obj->udata);
6268         kfree(obj);
6269 }
6270
6271 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
6272                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6273                             const struct nlattr * const nla[],
6274                             struct netlink_ext_ack *extack)
6275 {
6276         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6277         u8 genmask = nft_genmask_next(net);
6278         int family = nfmsg->nfgen_family;
6279         const struct nlattr *attr;
6280         struct nft_table *table;
6281         struct nft_object *obj;
6282         struct nft_ctx ctx;
6283         u32 objtype;
6284
6285         if (!nla[NFTA_OBJ_TYPE] ||
6286             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6287                 return -EINVAL;
6288
6289         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6290         if (IS_ERR(table)) {
6291                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6292                 return PTR_ERR(table);
6293         }
6294
6295         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6296         if (nla[NFTA_OBJ_HANDLE]) {
6297                 attr = nla[NFTA_OBJ_HANDLE];
6298                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6299         } else {
6300                 attr = nla[NFTA_OBJ_NAME];
6301                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6302         }
6303
6304         if (IS_ERR(obj)) {
6305                 NL_SET_BAD_ATTR(extack, attr);
6306                 return PTR_ERR(obj);
6307         }
6308         if (obj->use > 0) {
6309                 NL_SET_BAD_ATTR(extack, attr);
6310                 return -EBUSY;
6311         }
6312
6313         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6314
6315         return nft_delobj(&ctx, obj);
6316 }
6317
6318 void nft_obj_notify(struct net *net, const struct nft_table *table,
6319                     struct nft_object *obj, u32 portid, u32 seq, int event,
6320                     int family, int report, gfp_t gfp)
6321 {
6322         struct sk_buff *skb;
6323         int err;
6324         char *buf = kasprintf(gfp, "%s:%llu;?:0",
6325                               table->name, table->handle);
6326
6327         audit_log_nfcfg(buf,
6328                         family,
6329                         obj->handle,
6330                         event == NFT_MSG_NEWOBJ ?
6331                                 AUDIT_NFT_OP_OBJ_REGISTER :
6332                                 AUDIT_NFT_OP_OBJ_UNREGISTER,
6333                         gfp);
6334         kfree(buf);
6335
6336         if (!report &&
6337             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6338                 return;
6339
6340         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6341         if (skb == NULL)
6342                 goto err;
6343
6344         err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6345                                       table, obj, false);
6346         if (err < 0) {
6347                 kfree_skb(skb);
6348                 goto err;
6349         }
6350
6351         nft_notify_enqueue(skb, report, &net->nft.notify_list);
6352         return;
6353 err:
6354         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6355 }
6356 EXPORT_SYMBOL_GPL(nft_obj_notify);
6357
6358 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6359                                  struct nft_object *obj, int event)
6360 {
6361         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6362                        ctx->family, ctx->report, GFP_KERNEL);
6363 }
6364
6365 /*
6366  * Flow tables
6367  */
6368 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6369 {
6370         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6371         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6372         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6373 }
6374 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6375
6376 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6377 {
6378         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6379         list_del_rcu(&type->list);
6380         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6381 }
6382 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6383
6384 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6385         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
6386                                             .len = NFT_NAME_MAXLEN - 1 },
6387         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
6388                                             .len = NFT_NAME_MAXLEN - 1 },
6389         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
6390         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
6391         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
6392 };
6393
6394 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6395                                            const struct nlattr *nla, u8 genmask)
6396 {
6397         struct nft_flowtable *flowtable;
6398
6399         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6400                 if (!nla_strcmp(nla, flowtable->name) &&
6401                     nft_active_genmask(flowtable, genmask))
6402                         return flowtable;
6403         }
6404         return ERR_PTR(-ENOENT);
6405 }
6406 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6407
6408 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6409                                     struct nft_flowtable *flowtable,
6410                                     enum nft_trans_phase phase)
6411 {
6412         switch (phase) {
6413         case NFT_TRANS_PREPARE:
6414         case NFT_TRANS_ABORT:
6415         case NFT_TRANS_RELEASE:
6416                 flowtable->use--;
6417                 fallthrough;
6418         default:
6419                 return;
6420         }
6421 }
6422 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6423
6424 static struct nft_flowtable *
6425 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6426                               const struct nlattr *nla, u8 genmask)
6427 {
6428        struct nft_flowtable *flowtable;
6429
6430        list_for_each_entry(flowtable, &table->flowtables, list) {
6431                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6432                    nft_active_genmask(flowtable, genmask))
6433                        return flowtable;
6434        }
6435        return ERR_PTR(-ENOENT);
6436 }
6437
6438 struct nft_flowtable_hook {
6439         u32                     num;
6440         int                     priority;
6441         struct list_head        list;
6442 };
6443
6444 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6445         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
6446         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
6447         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
6448 };
6449
6450 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6451                                     const struct nlattr *attr,
6452                                     struct nft_flowtable_hook *flowtable_hook,
6453                                     struct nft_flowtable *flowtable, bool add)
6454 {
6455         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6456         struct nft_hook *hook;
6457         int hooknum, priority;
6458         int err;
6459
6460         INIT_LIST_HEAD(&flowtable_hook->list);
6461
6462         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6463                                           nft_flowtable_hook_policy, NULL);
6464         if (err < 0)
6465                 return err;
6466
6467         if (add) {
6468                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6469                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6470                         return -EINVAL;
6471
6472                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6473                 if (hooknum != NF_NETDEV_INGRESS)
6474                         return -EOPNOTSUPP;
6475
6476                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6477
6478                 flowtable_hook->priority        = priority;
6479                 flowtable_hook->num             = hooknum;
6480         } else {
6481                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6482                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6483                         if (hooknum != flowtable->hooknum)
6484                                 return -EOPNOTSUPP;
6485                 }
6486
6487                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6488                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6489                         if (priority != flowtable->data.priority)
6490                                 return -EOPNOTSUPP;
6491                 }
6492
6493                 flowtable_hook->priority        = flowtable->data.priority;
6494                 flowtable_hook->num             = flowtable->hooknum;
6495         }
6496
6497         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6498                 err = nf_tables_parse_netdev_hooks(ctx->net,
6499                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
6500                                                    &flowtable_hook->list);
6501                 if (err < 0)
6502                         return err;
6503         }
6504
6505         list_for_each_entry(hook, &flowtable_hook->list, list) {
6506                 hook->ops.pf            = NFPROTO_NETDEV;
6507                 hook->ops.hooknum       = flowtable_hook->num;
6508                 hook->ops.priority      = flowtable_hook->priority;
6509                 hook->ops.priv          = &flowtable->data;
6510                 hook->ops.hook          = flowtable->data.type->hook;
6511         }
6512
6513         return err;
6514 }
6515
6516 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6517 {
6518         const struct nf_flowtable_type *type;
6519
6520         list_for_each_entry(type, &nf_tables_flowtables, list) {
6521                 if (family == type->family)
6522                         return type;
6523         }
6524         return NULL;
6525 }
6526
6527 static const struct nf_flowtable_type *
6528 nft_flowtable_type_get(struct net *net, u8 family)
6529 {
6530         const struct nf_flowtable_type *type;
6531
6532         type = __nft_flowtable_type_get(family);
6533         if (type != NULL && try_module_get(type->owner))
6534                 return type;
6535
6536         lockdep_nfnl_nft_mutex_not_held();
6537 #ifdef CONFIG_MODULES
6538         if (type == NULL) {
6539                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6540                         return ERR_PTR(-EAGAIN);
6541         }
6542 #endif
6543         return ERR_PTR(-ENOENT);
6544 }
6545
6546 /* Only called from error and netdev event paths. */
6547 static void nft_unregister_flowtable_hook(struct net *net,
6548                                           struct nft_flowtable *flowtable,
6549                                           struct nft_hook *hook)
6550 {
6551         nf_unregister_net_hook(net, &hook->ops);
6552         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6553                                     FLOW_BLOCK_UNBIND);
6554 }
6555
6556 static void nft_unregister_flowtable_net_hooks(struct net *net,
6557                                                struct list_head *hook_list)
6558 {
6559         struct nft_hook *hook;
6560
6561         list_for_each_entry(hook, hook_list, list)
6562                 nf_unregister_net_hook(net, &hook->ops);
6563 }
6564
6565 static int nft_register_flowtable_net_hooks(struct net *net,
6566                                             struct nft_table *table,
6567                                             struct list_head *hook_list,
6568                                             struct nft_flowtable *flowtable)
6569 {
6570         struct nft_hook *hook, *hook2, *next;
6571         struct nft_flowtable *ft;
6572         int err, i = 0;
6573
6574         list_for_each_entry(hook, hook_list, list) {
6575                 list_for_each_entry(ft, &table->flowtables, list) {
6576                         list_for_each_entry(hook2, &ft->hook_list, list) {
6577                                 if (hook->ops.dev == hook2->ops.dev &&
6578                                     hook->ops.pf == hook2->ops.pf) {
6579                                         err = -EEXIST;
6580                                         goto err_unregister_net_hooks;
6581                                 }
6582                         }
6583                 }
6584
6585                 err = flowtable->data.type->setup(&flowtable->data,
6586                                                   hook->ops.dev,
6587                                                   FLOW_BLOCK_BIND);
6588                 if (err < 0)
6589                         goto err_unregister_net_hooks;
6590
6591                 err = nf_register_net_hook(net, &hook->ops);
6592                 if (err < 0) {
6593                         flowtable->data.type->setup(&flowtable->data,
6594                                                     hook->ops.dev,
6595                                                     FLOW_BLOCK_UNBIND);
6596                         goto err_unregister_net_hooks;
6597                 }
6598
6599                 i++;
6600         }
6601
6602         return 0;
6603
6604 err_unregister_net_hooks:
6605         list_for_each_entry_safe(hook, next, hook_list, list) {
6606                 if (i-- <= 0)
6607                         break;
6608
6609                 nft_unregister_flowtable_hook(net, flowtable, hook);
6610                 list_del_rcu(&hook->list);
6611                 kfree_rcu(hook, rcu);
6612         }
6613
6614         return err;
6615 }
6616
6617 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6618 {
6619         struct nft_hook *hook, *next;
6620
6621         list_for_each_entry_safe(hook, next, hook_list, list) {
6622                 list_del_rcu(&hook->list);
6623                 kfree_rcu(hook, rcu);
6624         }
6625 }
6626
6627 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6628                                 struct nft_flowtable *flowtable)
6629 {
6630         const struct nlattr * const *nla = ctx->nla;
6631         struct nft_flowtable_hook flowtable_hook;
6632         struct nft_hook *hook, *next;
6633         struct nft_trans *trans;
6634         bool unregister = false;
6635         int err;
6636
6637         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6638                                        &flowtable_hook, flowtable, false);
6639         if (err < 0)
6640                 return err;
6641
6642         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6643                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6644                         list_del(&hook->list);
6645                         kfree(hook);
6646                 }
6647         }
6648
6649         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6650                                                &flowtable_hook.list, flowtable);
6651         if (err < 0)
6652                 goto err_flowtable_update_hook;
6653
6654         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6655                                 sizeof(struct nft_trans_flowtable));
6656         if (!trans) {
6657                 unregister = true;
6658                 err = -ENOMEM;
6659                 goto err_flowtable_update_hook;
6660         }
6661
6662         nft_trans_flowtable(trans) = flowtable;
6663         nft_trans_flowtable_update(trans) = true;
6664         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6665         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6666
6667         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6668
6669         return 0;
6670
6671 err_flowtable_update_hook:
6672         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6673                 if (unregister)
6674                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6675                 list_del_rcu(&hook->list);
6676                 kfree_rcu(hook, rcu);
6677         }
6678
6679         return err;
6680
6681 }
6682
6683 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6684                                   struct sk_buff *skb,
6685                                   const struct nlmsghdr *nlh,
6686                                   const struct nlattr * const nla[],
6687                                   struct netlink_ext_ack *extack)
6688 {
6689         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6690         struct nft_flowtable_hook flowtable_hook;
6691         const struct nf_flowtable_type *type;
6692         u8 genmask = nft_genmask_next(net);
6693         int family = nfmsg->nfgen_family;
6694         struct nft_flowtable *flowtable;
6695         struct nft_hook *hook, *next;
6696         struct nft_table *table;
6697         struct nft_ctx ctx;
6698         int err;
6699
6700         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6701             !nla[NFTA_FLOWTABLE_NAME] ||
6702             !nla[NFTA_FLOWTABLE_HOOK])
6703                 return -EINVAL;
6704
6705         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6706                                  genmask);
6707         if (IS_ERR(table)) {
6708                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6709                 return PTR_ERR(table);
6710         }
6711
6712         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6713                                          genmask);
6714         if (IS_ERR(flowtable)) {
6715                 err = PTR_ERR(flowtable);
6716                 if (err != -ENOENT) {
6717                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6718                         return err;
6719                 }
6720         } else {
6721                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6722                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6723                         return -EEXIST;
6724                 }
6725
6726                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6727
6728                 return nft_flowtable_update(&ctx, nlh, flowtable);
6729         }
6730
6731         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6732
6733         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6734         if (!flowtable)
6735                 return -ENOMEM;
6736
6737         flowtable->table = table;
6738         flowtable->handle = nf_tables_alloc_handle(table);
6739         INIT_LIST_HEAD(&flowtable->hook_list);
6740
6741         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6742         if (!flowtable->name) {
6743                 err = -ENOMEM;
6744                 goto err1;
6745         }
6746
6747         type = nft_flowtable_type_get(net, family);
6748         if (IS_ERR(type)) {
6749                 err = PTR_ERR(type);
6750                 goto err2;
6751         }
6752
6753         if (nla[NFTA_FLOWTABLE_FLAGS]) {
6754                 flowtable->data.flags =
6755                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6756                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK)
6757                         goto err3;
6758         }
6759
6760         write_pnet(&flowtable->data.net, net);
6761         flowtable->data.type = type;
6762         err = type->init(&flowtable->data);
6763         if (err < 0)
6764                 goto err3;
6765
6766         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6767                                        &flowtable_hook, flowtable, true);
6768         if (err < 0)
6769                 goto err4;
6770
6771         list_splice(&flowtable_hook.list, &flowtable->hook_list);
6772         flowtable->data.priority = flowtable_hook.priority;
6773         flowtable->hooknum = flowtable_hook.num;
6774
6775         err = nft_register_flowtable_net_hooks(ctx.net, table,
6776                                                &flowtable->hook_list,
6777                                                flowtable);
6778         if (err < 0) {
6779                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
6780                 goto err4;
6781         }
6782
6783         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6784         if (err < 0)
6785                 goto err5;
6786
6787         list_add_tail_rcu(&flowtable->list, &table->flowtables);
6788         table->use++;
6789
6790         return 0;
6791 err5:
6792         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6793                 nft_unregister_flowtable_hook(net, flowtable, hook);
6794                 list_del_rcu(&hook->list);
6795                 kfree_rcu(hook, rcu);
6796         }
6797 err4:
6798         flowtable->data.type->free(&flowtable->data);
6799 err3:
6800         module_put(type->owner);
6801 err2:
6802         kfree(flowtable->name);
6803 err1:
6804         kfree(flowtable);
6805         return err;
6806 }
6807
6808 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
6809 {
6810         struct nft_hook *this, *next;
6811
6812         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
6813                 list_del(&this->list);
6814                 kfree(this);
6815         }
6816 }
6817
6818 static int nft_delflowtable_hook(struct nft_ctx *ctx,
6819                                  struct nft_flowtable *flowtable)
6820 {
6821         const struct nlattr * const *nla = ctx->nla;
6822         struct nft_flowtable_hook flowtable_hook;
6823         struct nft_hook *this, *hook;
6824         struct nft_trans *trans;
6825         int err;
6826
6827         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6828                                        &flowtable_hook, flowtable, false);
6829         if (err < 0)
6830                 return err;
6831
6832         list_for_each_entry(this, &flowtable_hook.list, list) {
6833                 hook = nft_hook_list_find(&flowtable->hook_list, this);
6834                 if (!hook) {
6835                         err = -ENOENT;
6836                         goto err_flowtable_del_hook;
6837                 }
6838                 hook->inactive = true;
6839         }
6840
6841         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
6842                                 sizeof(struct nft_trans_flowtable));
6843         if (!trans) {
6844                 err = -ENOMEM;
6845                 goto err_flowtable_del_hook;
6846         }
6847
6848         nft_trans_flowtable(trans) = flowtable;
6849         nft_trans_flowtable_update(trans) = true;
6850         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6851         nft_flowtable_hook_release(&flowtable_hook);
6852
6853         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6854
6855         return 0;
6856
6857 err_flowtable_del_hook:
6858         list_for_each_entry(this, &flowtable_hook.list, list) {
6859                 hook = nft_hook_list_find(&flowtable->hook_list, this);
6860                 if (!hook)
6861                         break;
6862
6863                 hook->inactive = false;
6864         }
6865         nft_flowtable_hook_release(&flowtable_hook);
6866
6867         return err;
6868 }
6869
6870 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
6871                                   struct sk_buff *skb,
6872                                   const struct nlmsghdr *nlh,
6873                                   const struct nlattr * const nla[],
6874                                   struct netlink_ext_ack *extack)
6875 {
6876         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6877         u8 genmask = nft_genmask_next(net);
6878         int family = nfmsg->nfgen_family;
6879         struct nft_flowtable *flowtable;
6880         const struct nlattr *attr;
6881         struct nft_table *table;
6882         struct nft_ctx ctx;
6883
6884         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6885             (!nla[NFTA_FLOWTABLE_NAME] &&
6886              !nla[NFTA_FLOWTABLE_HANDLE]))
6887                 return -EINVAL;
6888
6889         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6890                                  genmask);
6891         if (IS_ERR(table)) {
6892                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6893                 return PTR_ERR(table);
6894         }
6895
6896         if (nla[NFTA_FLOWTABLE_HANDLE]) {
6897                 attr = nla[NFTA_FLOWTABLE_HANDLE];
6898                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
6899         } else {
6900                 attr = nla[NFTA_FLOWTABLE_NAME];
6901                 flowtable = nft_flowtable_lookup(table, attr, genmask);
6902         }
6903
6904         if (IS_ERR(flowtable)) {
6905                 NL_SET_BAD_ATTR(extack, attr);
6906                 return PTR_ERR(flowtable);
6907         }
6908
6909         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6910
6911         if (nla[NFTA_FLOWTABLE_HOOK])
6912                 return nft_delflowtable_hook(&ctx, flowtable);
6913
6914         if (flowtable->use > 0) {
6915                 NL_SET_BAD_ATTR(extack, attr);
6916                 return -EBUSY;
6917         }
6918
6919         return nft_delflowtable(&ctx, flowtable);
6920 }
6921
6922 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
6923                                          u32 portid, u32 seq, int event,
6924                                          u32 flags, int family,
6925                                          struct nft_flowtable *flowtable,
6926                                          struct list_head *hook_list)
6927 {
6928         struct nlattr *nest, *nest_devs;
6929         struct nfgenmsg *nfmsg;
6930         struct nft_hook *hook;
6931         struct nlmsghdr *nlh;
6932
6933         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6934         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6935         if (nlh == NULL)
6936                 goto nla_put_failure;
6937
6938         nfmsg = nlmsg_data(nlh);
6939         nfmsg->nfgen_family     = family;
6940         nfmsg->version          = NFNETLINK_V0;
6941         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
6942
6943         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
6944             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
6945             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
6946             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
6947                          NFTA_FLOWTABLE_PAD) ||
6948             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
6949                 goto nla_put_failure;
6950
6951         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
6952         if (!nest)
6953                 goto nla_put_failure;
6954         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
6955             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
6956                 goto nla_put_failure;
6957
6958         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
6959         if (!nest_devs)
6960                 goto nla_put_failure;
6961
6962         list_for_each_entry_rcu(hook, hook_list, list) {
6963                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
6964                         goto nla_put_failure;
6965         }
6966         nla_nest_end(skb, nest_devs);
6967         nla_nest_end(skb, nest);
6968
6969         nlmsg_end(skb, nlh);
6970         return 0;
6971
6972 nla_put_failure:
6973         nlmsg_trim(skb, nlh);
6974         return -1;
6975 }
6976
6977 struct nft_flowtable_filter {
6978         char            *table;
6979 };
6980
6981 static int nf_tables_dump_flowtable(struct sk_buff *skb,
6982                                     struct netlink_callback *cb)
6983 {
6984         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6985         struct nft_flowtable_filter *filter = cb->data;
6986         unsigned int idx = 0, s_idx = cb->args[0];
6987         struct net *net = sock_net(skb->sk);
6988         int family = nfmsg->nfgen_family;
6989         struct nft_flowtable *flowtable;
6990         const struct nft_table *table;
6991
6992         rcu_read_lock();
6993         cb->seq = net->nft.base_seq;
6994
6995         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6996                 if (family != NFPROTO_UNSPEC && family != table->family)
6997                         continue;
6998
6999                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7000                         if (!nft_is_active(net, flowtable))
7001                                 goto cont;
7002                         if (idx < s_idx)
7003                                 goto cont;
7004                         if (idx > s_idx)
7005                                 memset(&cb->args[1], 0,
7006                                        sizeof(cb->args) - sizeof(cb->args[0]));
7007                         if (filter && filter->table &&
7008                             strcmp(filter->table, table->name))
7009                                 goto cont;
7010
7011                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7012                                                           cb->nlh->nlmsg_seq,
7013                                                           NFT_MSG_NEWFLOWTABLE,
7014                                                           NLM_F_MULTI | NLM_F_APPEND,
7015                                                           table->family,
7016                                                           flowtable,
7017                                                           &flowtable->hook_list) < 0)
7018                                 goto done;
7019
7020                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7021 cont:
7022                         idx++;
7023                 }
7024         }
7025 done:
7026         rcu_read_unlock();
7027
7028         cb->args[0] = idx;
7029         return skb->len;
7030 }
7031
7032 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7033 {
7034         const struct nlattr * const *nla = cb->data;
7035         struct nft_flowtable_filter *filter = NULL;
7036
7037         if (nla[NFTA_FLOWTABLE_TABLE]) {
7038                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7039                 if (!filter)
7040                         return -ENOMEM;
7041
7042                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7043                                            GFP_ATOMIC);
7044                 if (!filter->table) {
7045                         kfree(filter);
7046                         return -ENOMEM;
7047                 }
7048         }
7049
7050         cb->data = filter;
7051         return 0;
7052 }
7053
7054 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7055 {
7056         struct nft_flowtable_filter *filter = cb->data;
7057
7058         if (!filter)
7059                 return 0;
7060
7061         kfree(filter->table);
7062         kfree(filter);
7063
7064         return 0;
7065 }
7066
7067 /* called with rcu_read_lock held */
7068 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
7069                                   struct sk_buff *skb,
7070                                   const struct nlmsghdr *nlh,
7071                                   const struct nlattr * const nla[],
7072                                   struct netlink_ext_ack *extack)
7073 {
7074         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7075         u8 genmask = nft_genmask_cur(net);
7076         int family = nfmsg->nfgen_family;
7077         struct nft_flowtable *flowtable;
7078         const struct nft_table *table;
7079         struct sk_buff *skb2;
7080         int err;
7081
7082         if (nlh->nlmsg_flags & NLM_F_DUMP) {
7083                 struct netlink_dump_control c = {
7084                         .start = nf_tables_dump_flowtable_start,
7085                         .dump = nf_tables_dump_flowtable,
7086                         .done = nf_tables_dump_flowtable_done,
7087                         .module = THIS_MODULE,
7088                         .data = (void *)nla,
7089                 };
7090
7091                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
7092         }
7093
7094         if (!nla[NFTA_FLOWTABLE_NAME])
7095                 return -EINVAL;
7096
7097         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7098                                  genmask);
7099         if (IS_ERR(table))
7100                 return PTR_ERR(table);
7101
7102         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7103                                          genmask);
7104         if (IS_ERR(flowtable))
7105                 return PTR_ERR(flowtable);
7106
7107         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7108         if (!skb2)
7109                 return -ENOMEM;
7110
7111         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7112                                             nlh->nlmsg_seq,
7113                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7114                                             flowtable, &flowtable->hook_list);
7115         if (err < 0)
7116                 goto err_fill_flowtable_info;
7117
7118         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7119
7120 err_fill_flowtable_info:
7121         kfree_skb(skb2);
7122         return err;
7123 }
7124
7125 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7126                                        struct nft_flowtable *flowtable,
7127                                        struct list_head *hook_list,
7128                                        int event)
7129 {
7130         struct sk_buff *skb;
7131         int err;
7132         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7133                               flowtable->table->name, flowtable->table->handle,
7134                               flowtable->name, flowtable->handle);
7135
7136         audit_log_nfcfg(buf,
7137                         ctx->family,
7138                         flowtable->hooknum,
7139                         event == NFT_MSG_NEWFLOWTABLE ?
7140                                 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
7141                                 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7142                         GFP_KERNEL);
7143         kfree(buf);
7144
7145         if (!ctx->report &&
7146             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7147                 return;
7148
7149         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7150         if (skb == NULL)
7151                 goto err;
7152
7153         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7154                                             ctx->seq, event, 0,
7155                                             ctx->family, flowtable, hook_list);
7156         if (err < 0) {
7157                 kfree_skb(skb);
7158                 goto err;
7159         }
7160
7161         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
7162         return;
7163 err:
7164         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7165 }
7166
7167 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7168 {
7169         struct nft_hook *hook, *next;
7170
7171         flowtable->data.type->free(&flowtable->data);
7172         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7173                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7174                                             FLOW_BLOCK_UNBIND);
7175                 list_del_rcu(&hook->list);
7176                 kfree(hook);
7177         }
7178         kfree(flowtable->name);
7179         module_put(flowtable->data.type->owner);
7180         kfree(flowtable);
7181 }
7182
7183 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7184                                    u32 portid, u32 seq)
7185 {
7186         struct nlmsghdr *nlh;
7187         struct nfgenmsg *nfmsg;
7188         char buf[TASK_COMM_LEN];
7189         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7190
7191         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7192         if (nlh == NULL)
7193                 goto nla_put_failure;
7194
7195         nfmsg = nlmsg_data(nlh);
7196         nfmsg->nfgen_family     = AF_UNSPEC;
7197         nfmsg->version          = NFNETLINK_V0;
7198         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7199
7200         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7201             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7202             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7203                 goto nla_put_failure;
7204
7205         nlmsg_end(skb, nlh);
7206         return 0;
7207
7208 nla_put_failure:
7209         nlmsg_trim(skb, nlh);
7210         return -EMSGSIZE;
7211 }
7212
7213 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7214                                 struct nft_flowtable *flowtable)
7215 {
7216         struct nft_hook *hook;
7217
7218         list_for_each_entry(hook, &flowtable->hook_list, list) {
7219                 if (hook->ops.dev != dev)
7220                         continue;
7221
7222                 /* flow_offload_netdev_event() cleans up entries for us. */
7223                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7224                 list_del_rcu(&hook->list);
7225                 kfree_rcu(hook, rcu);
7226                 break;
7227         }
7228 }
7229
7230 static int nf_tables_flowtable_event(struct notifier_block *this,
7231                                      unsigned long event, void *ptr)
7232 {
7233         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7234         struct nft_flowtable *flowtable;
7235         struct nft_table *table;
7236         struct net *net;
7237
7238         if (event != NETDEV_UNREGISTER)
7239                 return 0;
7240
7241         net = dev_net(dev);
7242         mutex_lock(&net->nft.commit_mutex);
7243         list_for_each_entry(table, &net->nft.tables, list) {
7244                 list_for_each_entry(flowtable, &table->flowtables, list) {
7245                         nft_flowtable_event(event, dev, flowtable);
7246                 }
7247         }
7248         mutex_unlock(&net->nft.commit_mutex);
7249
7250         return NOTIFY_DONE;
7251 }
7252
7253 static struct notifier_block nf_tables_flowtable_notifier = {
7254         .notifier_call  = nf_tables_flowtable_event,
7255 };
7256
7257 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7258                                  int event)
7259 {
7260         struct nlmsghdr *nlh = nlmsg_hdr(skb);
7261         struct sk_buff *skb2;
7262         int err;
7263
7264         audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
7265                         AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
7266
7267         if (!nlmsg_report(nlh) &&
7268             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7269                 return;
7270
7271         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7272         if (skb2 == NULL)
7273                 goto err;
7274
7275         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7276                                       nlh->nlmsg_seq);
7277         if (err < 0) {
7278                 kfree_skb(skb2);
7279                 goto err;
7280         }
7281
7282         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7283                        nlmsg_report(nlh), GFP_KERNEL);
7284         return;
7285 err:
7286         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7287                           -ENOBUFS);
7288 }
7289
7290 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7291                             struct sk_buff *skb, const struct nlmsghdr *nlh,
7292                             const struct nlattr * const nla[],
7293                             struct netlink_ext_ack *extack)
7294 {
7295         struct sk_buff *skb2;
7296         int err;
7297
7298         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7299         if (skb2 == NULL)
7300                 return -ENOMEM;
7301
7302         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7303                                       nlh->nlmsg_seq);
7304         if (err < 0)
7305                 goto err_fill_gen_info;
7306
7307         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7308
7309 err_fill_gen_info:
7310         kfree_skb(skb2);
7311         return err;
7312 }
7313
7314 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7315         [NFT_MSG_NEWTABLE] = {
7316                 .call_batch     = nf_tables_newtable,
7317                 .attr_count     = NFTA_TABLE_MAX,
7318                 .policy         = nft_table_policy,
7319         },
7320         [NFT_MSG_GETTABLE] = {
7321                 .call_rcu       = nf_tables_gettable,
7322                 .attr_count     = NFTA_TABLE_MAX,
7323                 .policy         = nft_table_policy,
7324         },
7325         [NFT_MSG_DELTABLE] = {
7326                 .call_batch     = nf_tables_deltable,
7327                 .attr_count     = NFTA_TABLE_MAX,
7328                 .policy         = nft_table_policy,
7329         },
7330         [NFT_MSG_NEWCHAIN] = {
7331                 .call_batch     = nf_tables_newchain,
7332                 .attr_count     = NFTA_CHAIN_MAX,
7333                 .policy         = nft_chain_policy,
7334         },
7335         [NFT_MSG_GETCHAIN] = {
7336                 .call_rcu       = nf_tables_getchain,
7337                 .attr_count     = NFTA_CHAIN_MAX,
7338                 .policy         = nft_chain_policy,
7339         },
7340         [NFT_MSG_DELCHAIN] = {
7341                 .call_batch     = nf_tables_delchain,
7342                 .attr_count     = NFTA_CHAIN_MAX,
7343                 .policy         = nft_chain_policy,
7344         },
7345         [NFT_MSG_NEWRULE] = {
7346                 .call_batch     = nf_tables_newrule,
7347                 .attr_count     = NFTA_RULE_MAX,
7348                 .policy         = nft_rule_policy,
7349         },
7350         [NFT_MSG_GETRULE] = {
7351                 .call_rcu       = nf_tables_getrule,
7352                 .attr_count     = NFTA_RULE_MAX,
7353                 .policy         = nft_rule_policy,
7354         },
7355         [NFT_MSG_DELRULE] = {
7356                 .call_batch     = nf_tables_delrule,
7357                 .attr_count     = NFTA_RULE_MAX,
7358                 .policy         = nft_rule_policy,
7359         },
7360         [NFT_MSG_NEWSET] = {
7361                 .call_batch     = nf_tables_newset,
7362                 .attr_count     = NFTA_SET_MAX,
7363                 .policy         = nft_set_policy,
7364         },
7365         [NFT_MSG_GETSET] = {
7366                 .call_rcu       = nf_tables_getset,
7367                 .attr_count     = NFTA_SET_MAX,
7368                 .policy         = nft_set_policy,
7369         },
7370         [NFT_MSG_DELSET] = {
7371                 .call_batch     = nf_tables_delset,
7372                 .attr_count     = NFTA_SET_MAX,
7373                 .policy         = nft_set_policy,
7374         },
7375         [NFT_MSG_NEWSETELEM] = {
7376                 .call_batch     = nf_tables_newsetelem,
7377                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7378                 .policy         = nft_set_elem_list_policy,
7379         },
7380         [NFT_MSG_GETSETELEM] = {
7381                 .call_rcu       = nf_tables_getsetelem,
7382                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7383                 .policy         = nft_set_elem_list_policy,
7384         },
7385         [NFT_MSG_DELSETELEM] = {
7386                 .call_batch     = nf_tables_delsetelem,
7387                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7388                 .policy         = nft_set_elem_list_policy,
7389         },
7390         [NFT_MSG_GETGEN] = {
7391                 .call_rcu       = nf_tables_getgen,
7392         },
7393         [NFT_MSG_NEWOBJ] = {
7394                 .call_batch     = nf_tables_newobj,
7395                 .attr_count     = NFTA_OBJ_MAX,
7396                 .policy         = nft_obj_policy,
7397         },
7398         [NFT_MSG_GETOBJ] = {
7399                 .call_rcu       = nf_tables_getobj,
7400                 .attr_count     = NFTA_OBJ_MAX,
7401                 .policy         = nft_obj_policy,
7402         },
7403         [NFT_MSG_DELOBJ] = {
7404                 .call_batch     = nf_tables_delobj,
7405                 .attr_count     = NFTA_OBJ_MAX,
7406                 .policy         = nft_obj_policy,
7407         },
7408         [NFT_MSG_GETOBJ_RESET] = {
7409                 .call_rcu       = nf_tables_getobj,
7410                 .attr_count     = NFTA_OBJ_MAX,
7411                 .policy         = nft_obj_policy,
7412         },
7413         [NFT_MSG_NEWFLOWTABLE] = {
7414                 .call_batch     = nf_tables_newflowtable,
7415                 .attr_count     = NFTA_FLOWTABLE_MAX,
7416                 .policy         = nft_flowtable_policy,
7417         },
7418         [NFT_MSG_GETFLOWTABLE] = {
7419                 .call_rcu       = nf_tables_getflowtable,
7420                 .attr_count     = NFTA_FLOWTABLE_MAX,
7421                 .policy         = nft_flowtable_policy,
7422         },
7423         [NFT_MSG_DELFLOWTABLE] = {
7424                 .call_batch     = nf_tables_delflowtable,
7425                 .attr_count     = NFTA_FLOWTABLE_MAX,
7426                 .policy         = nft_flowtable_policy,
7427         },
7428 };
7429
7430 static int nf_tables_validate(struct net *net)
7431 {
7432         struct nft_table *table;
7433
7434         switch (net->nft.validate_state) {
7435         case NFT_VALIDATE_SKIP:
7436                 break;
7437         case NFT_VALIDATE_NEED:
7438                 nft_validate_state_update(net, NFT_VALIDATE_DO);
7439                 fallthrough;
7440         case NFT_VALIDATE_DO:
7441                 list_for_each_entry(table, &net->nft.tables, list) {
7442                         if (nft_table_validate(net, table) < 0)
7443                                 return -EAGAIN;
7444                 }
7445                 break;
7446         }
7447
7448         return 0;
7449 }
7450
7451 /* a drop policy has to be deferred until all rules have been activated,
7452  * otherwise a large ruleset that contains a drop-policy base chain will
7453  * cause all packets to get dropped until the full transaction has been
7454  * processed.
7455  *
7456  * We defer the drop policy until the transaction has been finalized.
7457  */
7458 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7459 {
7460         struct nft_base_chain *basechain;
7461
7462         if (nft_trans_chain_policy(trans) != NF_DROP)
7463                 return;
7464
7465         if (!nft_is_base_chain(trans->ctx.chain))
7466                 return;
7467
7468         basechain = nft_base_chain(trans->ctx.chain);
7469         basechain->policy = NF_DROP;
7470 }
7471
7472 static void nft_chain_commit_update(struct nft_trans *trans)
7473 {
7474         struct nft_base_chain *basechain;
7475
7476         if (nft_trans_chain_name(trans)) {
7477                 rhltable_remove(&trans->ctx.table->chains_ht,
7478                                 &trans->ctx.chain->rhlhead,
7479                                 nft_chain_ht_params);
7480                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
7481                 rhltable_insert_key(&trans->ctx.table->chains_ht,
7482                                     trans->ctx.chain->name,
7483                                     &trans->ctx.chain->rhlhead,
7484                                     nft_chain_ht_params);
7485         }
7486
7487         if (!nft_is_base_chain(trans->ctx.chain))
7488                 return;
7489
7490         nft_chain_stats_replace(trans);
7491
7492         basechain = nft_base_chain(trans->ctx.chain);
7493
7494         switch (nft_trans_chain_policy(trans)) {
7495         case NF_DROP:
7496         case NF_ACCEPT:
7497                 basechain->policy = nft_trans_chain_policy(trans);
7498                 break;
7499         }
7500 }
7501
7502 static void nft_obj_commit_update(struct nft_trans *trans)
7503 {
7504         struct nft_object *newobj;
7505         struct nft_object *obj;
7506
7507         obj = nft_trans_obj(trans);
7508         newobj = nft_trans_obj_newobj(trans);
7509
7510         if (obj->ops->update)
7511                 obj->ops->update(obj, newobj);
7512
7513         kfree(newobj);
7514 }
7515
7516 static void nft_commit_release(struct nft_trans *trans)
7517 {
7518         switch (trans->msg_type) {
7519         case NFT_MSG_DELTABLE:
7520                 nf_tables_table_destroy(&trans->ctx);
7521                 break;
7522         case NFT_MSG_NEWCHAIN:
7523                 free_percpu(nft_trans_chain_stats(trans));
7524                 kfree(nft_trans_chain_name(trans));
7525                 break;
7526         case NFT_MSG_DELCHAIN:
7527                 nf_tables_chain_destroy(&trans->ctx);
7528                 break;
7529         case NFT_MSG_DELRULE:
7530                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7531                 break;
7532         case NFT_MSG_DELSET:
7533                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7534                 break;
7535         case NFT_MSG_DELSETELEM:
7536                 nf_tables_set_elem_destroy(&trans->ctx,
7537                                            nft_trans_elem_set(trans),
7538                                            nft_trans_elem(trans).priv);
7539                 break;
7540         case NFT_MSG_DELOBJ:
7541                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7542                 break;
7543         case NFT_MSG_DELFLOWTABLE:
7544                 if (nft_trans_flowtable_update(trans))
7545                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7546                 else
7547                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7548                 break;
7549         }
7550
7551         if (trans->put_net)
7552                 put_net(trans->ctx.net);
7553
7554         kfree(trans);
7555 }
7556
7557 static void nf_tables_trans_destroy_work(struct work_struct *w)
7558 {
7559         struct nft_trans *trans, *next;
7560         LIST_HEAD(head);
7561
7562         spin_lock(&nf_tables_destroy_list_lock);
7563         list_splice_init(&nf_tables_destroy_list, &head);
7564         spin_unlock(&nf_tables_destroy_list_lock);
7565
7566         if (list_empty(&head))
7567                 return;
7568
7569         synchronize_rcu();
7570
7571         list_for_each_entry_safe(trans, next, &head, list) {
7572                 list_del(&trans->list);
7573                 nft_commit_release(trans);
7574         }
7575 }
7576
7577 void nf_tables_trans_destroy_flush_work(void)
7578 {
7579         flush_work(&trans_destroy_work);
7580 }
7581 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7582
7583 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7584 {
7585         struct nft_rule *rule;
7586         unsigned int alloc = 0;
7587         int i;
7588
7589         /* already handled or inactive chain? */
7590         if (chain->rules_next || !nft_is_active_next(net, chain))
7591                 return 0;
7592
7593         rule = list_entry(&chain->rules, struct nft_rule, list);
7594         i = 0;
7595
7596         list_for_each_entry_continue(rule, &chain->rules, list) {
7597                 if (nft_is_active_next(net, rule))
7598                         alloc++;
7599         }
7600
7601         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7602         if (!chain->rules_next)
7603                 return -ENOMEM;
7604
7605         list_for_each_entry_continue(rule, &chain->rules, list) {
7606                 if (nft_is_active_next(net, rule))
7607                         chain->rules_next[i++] = rule;
7608         }
7609
7610         chain->rules_next[i] = NULL;
7611         return 0;
7612 }
7613
7614 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7615 {
7616         struct nft_trans *trans, *next;
7617
7618         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7619                 struct nft_chain *chain = trans->ctx.chain;
7620
7621                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7622                     trans->msg_type == NFT_MSG_DELRULE) {
7623                         kvfree(chain->rules_next);
7624                         chain->rules_next = NULL;
7625                 }
7626         }
7627 }
7628
7629 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7630 {
7631         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7632
7633         kvfree(o->start);
7634 }
7635
7636 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7637 {
7638         struct nft_rule **r = rules;
7639         struct nft_rules_old *old;
7640
7641         while (*r)
7642                 r++;
7643
7644         r++;    /* rcu_head is after end marker */
7645         old = (void *) r;
7646         old->start = rules;
7647
7648         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7649 }
7650
7651 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7652 {
7653         struct nft_rule **g0, **g1;
7654         bool next_genbit;
7655
7656         next_genbit = nft_gencursor_next(net);
7657
7658         g0 = rcu_dereference_protected(chain->rules_gen_0,
7659                                        lockdep_commit_lock_is_held(net));
7660         g1 = rcu_dereference_protected(chain->rules_gen_1,
7661                                        lockdep_commit_lock_is_held(net));
7662
7663         /* No changes to this chain? */
7664         if (chain->rules_next == NULL) {
7665                 /* chain had no change in last or next generation */
7666                 if (g0 == g1)
7667                         return;
7668                 /*
7669                  * chain had no change in this generation; make sure next
7670                  * one uses same rules as current generation.
7671                  */
7672                 if (next_genbit) {
7673                         rcu_assign_pointer(chain->rules_gen_1, g0);
7674                         nf_tables_commit_chain_free_rules_old(g1);
7675                 } else {
7676                         rcu_assign_pointer(chain->rules_gen_0, g1);
7677                         nf_tables_commit_chain_free_rules_old(g0);
7678                 }
7679
7680                 return;
7681         }
7682
7683         if (next_genbit)
7684                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7685         else
7686                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7687
7688         chain->rules_next = NULL;
7689
7690         if (g0 == g1)
7691                 return;
7692
7693         if (next_genbit)
7694                 nf_tables_commit_chain_free_rules_old(g1);
7695         else
7696                 nf_tables_commit_chain_free_rules_old(g0);
7697 }
7698
7699 static void nft_obj_del(struct nft_object *obj)
7700 {
7701         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7702         list_del_rcu(&obj->list);
7703 }
7704
7705 void nft_chain_del(struct nft_chain *chain)
7706 {
7707         struct nft_table *table = chain->table;
7708
7709         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7710                                      nft_chain_ht_params));
7711         list_del_rcu(&chain->list);
7712 }
7713
7714 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7715                                     struct list_head *hook_list)
7716 {
7717         struct nft_hook *hook, *next;
7718
7719         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7720                 if (hook->inactive)
7721                         list_move(&hook->list, hook_list);
7722         }
7723 }
7724
7725 static void nf_tables_module_autoload_cleanup(struct net *net)
7726 {
7727         struct nft_module_request *req, *next;
7728
7729         WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7730         list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7731                 WARN_ON_ONCE(!req->done);
7732                 list_del(&req->list);
7733                 kfree(req);
7734         }
7735 }
7736
7737 static void nf_tables_commit_release(struct net *net)
7738 {
7739         struct nft_trans *trans;
7740
7741         /* all side effects have to be made visible.
7742          * For example, if a chain named 'foo' has been deleted, a
7743          * new transaction must not find it anymore.
7744          *
7745          * Memory reclaim happens asynchronously from work queue
7746          * to prevent expensive synchronize_rcu() in commit phase.
7747          */
7748         if (list_empty(&net->nft.commit_list)) {
7749                 nf_tables_module_autoload_cleanup(net);
7750                 mutex_unlock(&net->nft.commit_mutex);
7751                 return;
7752         }
7753
7754         trans = list_last_entry(&net->nft.commit_list,
7755                                 struct nft_trans, list);
7756         get_net(trans->ctx.net);
7757         WARN_ON_ONCE(trans->put_net);
7758
7759         trans->put_net = true;
7760         spin_lock(&nf_tables_destroy_list_lock);
7761         list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7762         spin_unlock(&nf_tables_destroy_list_lock);
7763
7764         nf_tables_module_autoload_cleanup(net);
7765         schedule_work(&trans_destroy_work);
7766
7767         mutex_unlock(&net->nft.commit_mutex);
7768 }
7769
7770 static void nft_commit_notify(struct net *net, u32 portid)
7771 {
7772         struct sk_buff *batch_skb = NULL, *nskb, *skb;
7773         unsigned char *data;
7774         int len;
7775
7776         list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) {
7777                 if (!batch_skb) {
7778 new_batch:
7779                         batch_skb = skb;
7780                         len = NLMSG_GOODSIZE - skb->len;
7781                         list_del(&skb->list);
7782                         continue;
7783                 }
7784                 len -= skb->len;
7785                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
7786                         data = skb_put(batch_skb, skb->len);
7787                         memcpy(data, skb->data, skb->len);
7788                         list_del(&skb->list);
7789                         kfree_skb(skb);
7790                         continue;
7791                 }
7792                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7793                                NFT_CB(batch_skb).report, GFP_KERNEL);
7794                 goto new_batch;
7795         }
7796
7797         if (batch_skb) {
7798                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7799                                NFT_CB(batch_skb).report, GFP_KERNEL);
7800         }
7801
7802         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
7803 }
7804
7805 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
7806 {
7807         struct nft_trans *trans, *next;
7808         struct nft_trans_elem *te;
7809         struct nft_chain *chain;
7810         struct nft_table *table;
7811         int err;
7812
7813         if (list_empty(&net->nft.commit_list)) {
7814                 mutex_unlock(&net->nft.commit_mutex);
7815                 return 0;
7816         }
7817
7818         /* 0. Validate ruleset, otherwise roll back for error reporting. */
7819         if (nf_tables_validate(net) < 0)
7820                 return -EAGAIN;
7821
7822         err = nft_flow_rule_offload_commit(net);
7823         if (err < 0)
7824                 return err;
7825
7826         /* 1.  Allocate space for next generation rules_gen_X[] */
7827         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7828                 int ret;
7829
7830                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7831                     trans->msg_type == NFT_MSG_DELRULE) {
7832                         chain = trans->ctx.chain;
7833
7834                         ret = nf_tables_commit_chain_prepare(net, chain);
7835                         if (ret < 0) {
7836                                 nf_tables_commit_chain_prepare_cancel(net);
7837                                 return ret;
7838                         }
7839                 }
7840         }
7841
7842         /* step 2.  Make rules_gen_X visible to packet path */
7843         list_for_each_entry(table, &net->nft.tables, list) {
7844                 list_for_each_entry(chain, &table->chains, list)
7845                         nf_tables_commit_chain(net, chain);
7846         }
7847
7848         /*
7849          * Bump generation counter, invalidate any dump in progress.
7850          * Cannot fail after this point.
7851          */
7852         while (++net->nft.base_seq == 0);
7853
7854         /* step 3. Start new generation, rules_gen_X now in use. */
7855         net->nft.gencursor = nft_gencursor_next(net);
7856
7857         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7858                 switch (trans->msg_type) {
7859                 case NFT_MSG_NEWTABLE:
7860                         if (nft_trans_table_update(trans)) {
7861                                 if (!nft_trans_table_enable(trans)) {
7862                                         nf_tables_table_disable(net,
7863                                                                 trans->ctx.table);
7864                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7865                                 }
7866                         } else {
7867                                 nft_clear(net, trans->ctx.table);
7868                         }
7869                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
7870                         nft_trans_destroy(trans);
7871                         break;
7872                 case NFT_MSG_DELTABLE:
7873                         list_del_rcu(&trans->ctx.table->list);
7874                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
7875                         break;
7876                 case NFT_MSG_NEWCHAIN:
7877                         if (nft_trans_chain_update(trans)) {
7878                                 nft_chain_commit_update(trans);
7879                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7880                                 /* trans destroyed after rcu grace period */
7881                         } else {
7882                                 nft_chain_commit_drop_policy(trans);
7883                                 nft_clear(net, trans->ctx.chain);
7884                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7885                                 nft_trans_destroy(trans);
7886                         }
7887                         break;
7888                 case NFT_MSG_DELCHAIN:
7889                         nft_chain_del(trans->ctx.chain);
7890                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
7891                         nf_tables_unregister_hook(trans->ctx.net,
7892                                                   trans->ctx.table,
7893                                                   trans->ctx.chain);
7894                         break;
7895                 case NFT_MSG_NEWRULE:
7896                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
7897                         nf_tables_rule_notify(&trans->ctx,
7898                                               nft_trans_rule(trans),
7899                                               NFT_MSG_NEWRULE);
7900                         nft_trans_destroy(trans);
7901                         break;
7902                 case NFT_MSG_DELRULE:
7903                         list_del_rcu(&nft_trans_rule(trans)->list);
7904                         nf_tables_rule_notify(&trans->ctx,
7905                                               nft_trans_rule(trans),
7906                                               NFT_MSG_DELRULE);
7907                         nft_rule_expr_deactivate(&trans->ctx,
7908                                                  nft_trans_rule(trans),
7909                                                  NFT_TRANS_COMMIT);
7910                         break;
7911                 case NFT_MSG_NEWSET:
7912                         nft_clear(net, nft_trans_set(trans));
7913                         /* This avoids hitting -EBUSY when deleting the table
7914                          * from the transaction.
7915                          */
7916                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
7917                             !list_empty(&nft_trans_set(trans)->bindings))
7918                                 trans->ctx.table->use--;
7919
7920                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7921                                              NFT_MSG_NEWSET, GFP_KERNEL);
7922                         nft_trans_destroy(trans);
7923                         break;
7924                 case NFT_MSG_DELSET:
7925                         list_del_rcu(&nft_trans_set(trans)->list);
7926                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7927                                              NFT_MSG_DELSET, GFP_KERNEL);
7928                         break;
7929                 case NFT_MSG_NEWSETELEM:
7930                         te = (struct nft_trans_elem *)trans->data;
7931
7932                         te->set->ops->activate(net, te->set, &te->elem);
7933                         nf_tables_setelem_notify(&trans->ctx, te->set,
7934                                                  &te->elem,
7935                                                  NFT_MSG_NEWSETELEM, 0);
7936                         nft_trans_destroy(trans);
7937                         break;
7938                 case NFT_MSG_DELSETELEM:
7939                         te = (struct nft_trans_elem *)trans->data;
7940
7941                         nf_tables_setelem_notify(&trans->ctx, te->set,
7942                                                  &te->elem,
7943                                                  NFT_MSG_DELSETELEM, 0);
7944                         te->set->ops->remove(net, te->set, &te->elem);
7945                         atomic_dec(&te->set->nelems);
7946                         te->set->ndeact--;
7947                         break;
7948                 case NFT_MSG_NEWOBJ:
7949                         if (nft_trans_obj_update(trans)) {
7950                                 nft_obj_commit_update(trans);
7951                                 nf_tables_obj_notify(&trans->ctx,
7952                                                      nft_trans_obj(trans),
7953                                                      NFT_MSG_NEWOBJ);
7954                         } else {
7955                                 nft_clear(net, nft_trans_obj(trans));
7956                                 nf_tables_obj_notify(&trans->ctx,
7957                                                      nft_trans_obj(trans),
7958                                                      NFT_MSG_NEWOBJ);
7959                                 nft_trans_destroy(trans);
7960                         }
7961                         break;
7962                 case NFT_MSG_DELOBJ:
7963                         nft_obj_del(nft_trans_obj(trans));
7964                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
7965                                              NFT_MSG_DELOBJ);
7966                         break;
7967                 case NFT_MSG_NEWFLOWTABLE:
7968                         if (nft_trans_flowtable_update(trans)) {
7969                                 nf_tables_flowtable_notify(&trans->ctx,
7970                                                            nft_trans_flowtable(trans),
7971                                                            &nft_trans_flowtable_hooks(trans),
7972                                                            NFT_MSG_NEWFLOWTABLE);
7973                                 list_splice(&nft_trans_flowtable_hooks(trans),
7974                                             &nft_trans_flowtable(trans)->hook_list);
7975                         } else {
7976                                 nft_clear(net, nft_trans_flowtable(trans));
7977                                 nf_tables_flowtable_notify(&trans->ctx,
7978                                                            nft_trans_flowtable(trans),
7979                                                            &nft_trans_flowtable(trans)->hook_list,
7980                                                            NFT_MSG_NEWFLOWTABLE);
7981                         }
7982                         nft_trans_destroy(trans);
7983                         break;
7984                 case NFT_MSG_DELFLOWTABLE:
7985                         if (nft_trans_flowtable_update(trans)) {
7986                                 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
7987                                                         &nft_trans_flowtable_hooks(trans));
7988                                 nf_tables_flowtable_notify(&trans->ctx,
7989                                                            nft_trans_flowtable(trans),
7990                                                            &nft_trans_flowtable_hooks(trans),
7991                                                            NFT_MSG_DELFLOWTABLE);
7992                                 nft_unregister_flowtable_net_hooks(net,
7993                                                                    &nft_trans_flowtable_hooks(trans));
7994                         } else {
7995                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
7996                                 nf_tables_flowtable_notify(&trans->ctx,
7997                                                            nft_trans_flowtable(trans),
7998                                                            &nft_trans_flowtable(trans)->hook_list,
7999                                                            NFT_MSG_DELFLOWTABLE);
8000                                 nft_unregister_flowtable_net_hooks(net,
8001                                                 &nft_trans_flowtable(trans)->hook_list);
8002                         }
8003                         break;
8004                 }
8005         }
8006
8007         nft_commit_notify(net, NETLINK_CB(skb).portid);
8008         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8009         nf_tables_commit_release(net);
8010
8011         return 0;
8012 }
8013
8014 static void nf_tables_module_autoload(struct net *net)
8015 {
8016         struct nft_module_request *req, *next;
8017         LIST_HEAD(module_list);
8018
8019         list_splice_init(&net->nft.module_list, &module_list);
8020         mutex_unlock(&net->nft.commit_mutex);
8021         list_for_each_entry_safe(req, next, &module_list, list) {
8022                 request_module("%s", req->module);
8023                 req->done = true;
8024         }
8025         mutex_lock(&net->nft.commit_mutex);
8026         list_splice(&module_list, &net->nft.module_list);
8027 }
8028
8029 static void nf_tables_abort_release(struct nft_trans *trans)
8030 {
8031         switch (trans->msg_type) {
8032         case NFT_MSG_NEWTABLE:
8033                 nf_tables_table_destroy(&trans->ctx);
8034                 break;
8035         case NFT_MSG_NEWCHAIN:
8036                 nf_tables_chain_destroy(&trans->ctx);
8037                 break;
8038         case NFT_MSG_NEWRULE:
8039                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8040                 break;
8041         case NFT_MSG_NEWSET:
8042                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8043                 break;
8044         case NFT_MSG_NEWSETELEM:
8045                 nft_set_elem_destroy(nft_trans_elem_set(trans),
8046                                      nft_trans_elem(trans).priv, true);
8047                 break;
8048         case NFT_MSG_NEWOBJ:
8049                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8050                 break;
8051         case NFT_MSG_NEWFLOWTABLE:
8052                 if (nft_trans_flowtable_update(trans))
8053                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8054                 else
8055                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8056                 break;
8057         }
8058         kfree(trans);
8059 }
8060
8061 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8062 {
8063         struct nft_trans *trans, *next;
8064         struct nft_trans_elem *te;
8065         struct nft_hook *hook;
8066
8067         if (action == NFNL_ABORT_VALIDATE &&
8068             nf_tables_validate(net) < 0)
8069                 return -EAGAIN;
8070
8071         list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
8072                                          list) {
8073                 switch (trans->msg_type) {
8074                 case NFT_MSG_NEWTABLE:
8075                         if (nft_trans_table_update(trans)) {
8076                                 if (nft_trans_table_enable(trans)) {
8077                                         nf_tables_table_disable(net,
8078                                                                 trans->ctx.table);
8079                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8080                                 }
8081                                 nft_trans_destroy(trans);
8082                         } else {
8083                                 list_del_rcu(&trans->ctx.table->list);
8084                         }
8085                         break;
8086                 case NFT_MSG_DELTABLE:
8087                         nft_clear(trans->ctx.net, trans->ctx.table);
8088                         nft_trans_destroy(trans);
8089                         break;
8090                 case NFT_MSG_NEWCHAIN:
8091                         if (nft_trans_chain_update(trans)) {
8092                                 free_percpu(nft_trans_chain_stats(trans));
8093                                 kfree(nft_trans_chain_name(trans));
8094                                 nft_trans_destroy(trans);
8095                         } else {
8096                                 if (nft_chain_is_bound(trans->ctx.chain)) {
8097                                         nft_trans_destroy(trans);
8098                                         break;
8099                                 }
8100                                 trans->ctx.table->use--;
8101                                 nft_chain_del(trans->ctx.chain);
8102                                 nf_tables_unregister_hook(trans->ctx.net,
8103                                                           trans->ctx.table,
8104                                                           trans->ctx.chain);
8105                         }
8106                         break;
8107                 case NFT_MSG_DELCHAIN:
8108                         trans->ctx.table->use++;
8109                         nft_clear(trans->ctx.net, trans->ctx.chain);
8110                         nft_trans_destroy(trans);
8111                         break;
8112                 case NFT_MSG_NEWRULE:
8113                         trans->ctx.chain->use--;
8114                         list_del_rcu(&nft_trans_rule(trans)->list);
8115                         nft_rule_expr_deactivate(&trans->ctx,
8116                                                  nft_trans_rule(trans),
8117                                                  NFT_TRANS_ABORT);
8118                         break;
8119                 case NFT_MSG_DELRULE:
8120                         trans->ctx.chain->use++;
8121                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8122                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8123                         nft_trans_destroy(trans);
8124                         break;
8125                 case NFT_MSG_NEWSET:
8126                         trans->ctx.table->use--;
8127                         if (nft_trans_set_bound(trans)) {
8128                                 nft_trans_destroy(trans);
8129                                 break;
8130                         }
8131                         list_del_rcu(&nft_trans_set(trans)->list);
8132                         break;
8133                 case NFT_MSG_DELSET:
8134                         trans->ctx.table->use++;
8135                         nft_clear(trans->ctx.net, nft_trans_set(trans));
8136                         nft_trans_destroy(trans);
8137                         break;
8138                 case NFT_MSG_NEWSETELEM:
8139                         if (nft_trans_elem_set_bound(trans)) {
8140                                 nft_trans_destroy(trans);
8141                                 break;
8142                         }
8143                         te = (struct nft_trans_elem *)trans->data;
8144                         te->set->ops->remove(net, te->set, &te->elem);
8145                         atomic_dec(&te->set->nelems);
8146                         break;
8147                 case NFT_MSG_DELSETELEM:
8148                         te = (struct nft_trans_elem *)trans->data;
8149
8150                         nft_set_elem_activate(net, te->set, &te->elem);
8151                         te->set->ops->activate(net, te->set, &te->elem);
8152                         te->set->ndeact--;
8153
8154                         nft_trans_destroy(trans);
8155                         break;
8156                 case NFT_MSG_NEWOBJ:
8157                         if (nft_trans_obj_update(trans)) {
8158                                 kfree(nft_trans_obj_newobj(trans));
8159                                 nft_trans_destroy(trans);
8160                         } else {
8161                                 trans->ctx.table->use--;
8162                                 nft_obj_del(nft_trans_obj(trans));
8163                         }
8164                         break;
8165                 case NFT_MSG_DELOBJ:
8166                         trans->ctx.table->use++;
8167                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
8168                         nft_trans_destroy(trans);
8169                         break;
8170                 case NFT_MSG_NEWFLOWTABLE:
8171                         if (nft_trans_flowtable_update(trans)) {
8172                                 nft_unregister_flowtable_net_hooks(net,
8173                                                 &nft_trans_flowtable_hooks(trans));
8174                         } else {
8175                                 trans->ctx.table->use--;
8176                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8177                                 nft_unregister_flowtable_net_hooks(net,
8178                                                 &nft_trans_flowtable(trans)->hook_list);
8179                         }
8180                         break;
8181                 case NFT_MSG_DELFLOWTABLE:
8182                         if (nft_trans_flowtable_update(trans)) {
8183                                 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8184                                         hook->inactive = false;
8185                         } else {
8186                                 trans->ctx.table->use++;
8187                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8188                         }
8189                         nft_trans_destroy(trans);
8190                         break;
8191                 }
8192         }
8193
8194         synchronize_rcu();
8195
8196         list_for_each_entry_safe_reverse(trans, next,
8197                                          &net->nft.commit_list, list) {
8198                 list_del(&trans->list);
8199                 nf_tables_abort_release(trans);
8200         }
8201
8202         if (action == NFNL_ABORT_AUTOLOAD)
8203                 nf_tables_module_autoload(net);
8204         else
8205                 nf_tables_module_autoload_cleanup(net);
8206
8207         return 0;
8208 }
8209
8210 static void nf_tables_cleanup(struct net *net)
8211 {
8212         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8213 }
8214
8215 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8216                            enum nfnl_abort_action action)
8217 {
8218         int ret = __nf_tables_abort(net, action);
8219
8220         mutex_unlock(&net->nft.commit_mutex);
8221
8222         return ret;
8223 }
8224
8225 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8226 {
8227         bool genid_ok;
8228
8229         mutex_lock(&net->nft.commit_mutex);
8230
8231         genid_ok = genid == 0 || net->nft.base_seq == genid;
8232         if (!genid_ok)
8233                 mutex_unlock(&net->nft.commit_mutex);
8234
8235         /* else, commit mutex has to be released by commit or abort function */
8236         return genid_ok;
8237 }
8238
8239 static const struct nfnetlink_subsystem nf_tables_subsys = {
8240         .name           = "nf_tables",
8241         .subsys_id      = NFNL_SUBSYS_NFTABLES,
8242         .cb_count       = NFT_MSG_MAX,
8243         .cb             = nf_tables_cb,
8244         .commit         = nf_tables_commit,
8245         .abort          = nf_tables_abort,
8246         .cleanup        = nf_tables_cleanup,
8247         .valid_genid    = nf_tables_valid_genid,
8248         .owner          = THIS_MODULE,
8249 };
8250
8251 int nft_chain_validate_dependency(const struct nft_chain *chain,
8252                                   enum nft_chain_types type)
8253 {
8254         const struct nft_base_chain *basechain;
8255
8256         if (nft_is_base_chain(chain)) {
8257                 basechain = nft_base_chain(chain);
8258                 if (basechain->type->type != type)
8259                         return -EOPNOTSUPP;
8260         }
8261         return 0;
8262 }
8263 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8264
8265 int nft_chain_validate_hooks(const struct nft_chain *chain,
8266                              unsigned int hook_flags)
8267 {
8268         struct nft_base_chain *basechain;
8269
8270         if (nft_is_base_chain(chain)) {
8271                 basechain = nft_base_chain(chain);
8272
8273                 if ((1 << basechain->ops.hooknum) & hook_flags)
8274                         return 0;
8275
8276                 return -EOPNOTSUPP;
8277         }
8278
8279         return 0;
8280 }
8281 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8282
8283 /*
8284  * Loop detection - walk through the ruleset beginning at the destination chain
8285  * of a new jump until either the source chain is reached (loop) or all
8286  * reachable chains have been traversed.
8287  *
8288  * The loop check is performed whenever a new jump verdict is added to an
8289  * expression or verdict map or a verdict map is bound to a new chain.
8290  */
8291
8292 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8293                                  const struct nft_chain *chain);
8294
8295 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
8296                                         struct nft_set *set,
8297                                         const struct nft_set_iter *iter,
8298                                         struct nft_set_elem *elem)
8299 {
8300         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8301         const struct nft_data *data;
8302
8303         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8304             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
8305                 return 0;
8306
8307         data = nft_set_ext_data(ext);
8308         switch (data->verdict.code) {
8309         case NFT_JUMP:
8310         case NFT_GOTO:
8311                 return nf_tables_check_loops(ctx, data->verdict.chain);
8312         default:
8313                 return 0;
8314         }
8315 }
8316
8317 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8318                                  const struct nft_chain *chain)
8319 {
8320         const struct nft_rule *rule;
8321         const struct nft_expr *expr, *last;
8322         struct nft_set *set;
8323         struct nft_set_binding *binding;
8324         struct nft_set_iter iter;
8325
8326         if (ctx->chain == chain)
8327                 return -ELOOP;
8328
8329         list_for_each_entry(rule, &chain->rules, list) {
8330                 nft_rule_for_each_expr(expr, last, rule) {
8331                         struct nft_immediate_expr *priv;
8332                         const struct nft_data *data;
8333                         int err;
8334
8335                         if (strcmp(expr->ops->type->name, "immediate"))
8336                                 continue;
8337
8338                         priv = nft_expr_priv(expr);
8339                         if (priv->dreg != NFT_REG_VERDICT)
8340                                 continue;
8341
8342                         data = &priv->data;
8343                         switch (data->verdict.code) {
8344                         case NFT_JUMP:
8345                         case NFT_GOTO:
8346                                 err = nf_tables_check_loops(ctx,
8347                                                         data->verdict.chain);
8348                                 if (err < 0)
8349                                         return err;
8350                         default:
8351                                 break;
8352                         }
8353                 }
8354         }
8355
8356         list_for_each_entry(set, &ctx->table->sets, list) {
8357                 if (!nft_is_active_next(ctx->net, set))
8358                         continue;
8359                 if (!(set->flags & NFT_SET_MAP) ||
8360                     set->dtype != NFT_DATA_VERDICT)
8361                         continue;
8362
8363                 list_for_each_entry(binding, &set->bindings, list) {
8364                         if (!(binding->flags & NFT_SET_MAP) ||
8365                             binding->chain != chain)
8366                                 continue;
8367
8368                         iter.genmask    = nft_genmask_next(ctx->net);
8369                         iter.skip       = 0;
8370                         iter.count      = 0;
8371                         iter.err        = 0;
8372                         iter.fn         = nf_tables_loop_check_setelem;
8373
8374                         set->ops->walk(ctx, set, &iter);
8375                         if (iter.err < 0)
8376                                 return iter.err;
8377                 }
8378         }
8379
8380         return 0;
8381 }
8382
8383 /**
8384  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
8385  *
8386  *      @attr: netlink attribute to fetch value from
8387  *      @max: maximum value to be stored in dest
8388  *      @dest: pointer to the variable
8389  *
8390  *      Parse, check and store a given u32 netlink attribute into variable.
8391  *      This function returns -ERANGE if the value goes over maximum value.
8392  *      Otherwise a 0 is returned and the attribute value is stored in the
8393  *      destination variable.
8394  */
8395 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
8396 {
8397         u32 val;
8398
8399         val = ntohl(nla_get_be32(attr));
8400         if (val > max)
8401                 return -ERANGE;
8402
8403         *dest = val;
8404         return 0;
8405 }
8406 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8407
8408 /**
8409  *      nft_parse_register - parse a register value from a netlink attribute
8410  *
8411  *      @attr: netlink attribute
8412  *
8413  *      Parse and translate a register value from a netlink attribute.
8414  *      Registers used to be 128 bit wide, these register numbers will be
8415  *      mapped to the corresponding 32 bit register numbers.
8416  */
8417 unsigned int nft_parse_register(const struct nlattr *attr)
8418 {
8419         unsigned int reg;
8420
8421         reg = ntohl(nla_get_be32(attr));
8422         switch (reg) {
8423         case NFT_REG_VERDICT...NFT_REG_4:
8424                 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8425         default:
8426                 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8427         }
8428 }
8429 EXPORT_SYMBOL_GPL(nft_parse_register);
8430
8431 /**
8432  *      nft_dump_register - dump a register value to a netlink attribute
8433  *
8434  *      @skb: socket buffer
8435  *      @attr: attribute number
8436  *      @reg: register number
8437  *
8438  *      Construct a netlink attribute containing the register number. For
8439  *      compatibility reasons, register numbers being a multiple of 4 are
8440  *      translated to the corresponding 128 bit register numbers.
8441  */
8442 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8443 {
8444         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8445                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8446         else
8447                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8448
8449         return nla_put_be32(skb, attr, htonl(reg));
8450 }
8451 EXPORT_SYMBOL_GPL(nft_dump_register);
8452
8453 /**
8454  *      nft_validate_register_load - validate a load from a register
8455  *
8456  *      @reg: the register number
8457  *      @len: the length of the data
8458  *
8459  *      Validate that the input register is one of the general purpose
8460  *      registers and that the length of the load is within the bounds.
8461  */
8462 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
8463 {
8464         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8465                 return -EINVAL;
8466         if (len == 0)
8467                 return -EINVAL;
8468         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
8469                 return -ERANGE;
8470
8471         return 0;
8472 }
8473 EXPORT_SYMBOL_GPL(nft_validate_register_load);
8474
8475 /**
8476  *      nft_validate_register_store - validate an expressions' register store
8477  *
8478  *      @ctx: context of the expression performing the load
8479  *      @reg: the destination register number
8480  *      @data: the data to load
8481  *      @type: the data type
8482  *      @len: the length of the data
8483  *
8484  *      Validate that a data load uses the appropriate data type for
8485  *      the destination register and the length is within the bounds.
8486  *      A value of NULL for the data means that its runtime gathered
8487  *      data.
8488  */
8489 int nft_validate_register_store(const struct nft_ctx *ctx,
8490                                 enum nft_registers reg,
8491                                 const struct nft_data *data,
8492                                 enum nft_data_types type, unsigned int len)
8493 {
8494         int err;
8495
8496         switch (reg) {
8497         case NFT_REG_VERDICT:
8498                 if (type != NFT_DATA_VERDICT)
8499                         return -EINVAL;
8500
8501                 if (data != NULL &&
8502                     (data->verdict.code == NFT_GOTO ||
8503                      data->verdict.code == NFT_JUMP)) {
8504                         err = nf_tables_check_loops(ctx, data->verdict.chain);
8505                         if (err < 0)
8506                                 return err;
8507                 }
8508
8509                 return 0;
8510         default:
8511                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8512                         return -EINVAL;
8513                 if (len == 0)
8514                         return -EINVAL;
8515                 if (reg * NFT_REG32_SIZE + len >
8516                     sizeof_field(struct nft_regs, data))
8517                         return -ERANGE;
8518
8519                 if (data != NULL && type != NFT_DATA_VALUE)
8520                         return -EINVAL;
8521                 return 0;
8522         }
8523 }
8524 EXPORT_SYMBOL_GPL(nft_validate_register_store);
8525
8526 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8527         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
8528         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
8529                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
8530         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
8531 };
8532
8533 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8534                             struct nft_data_desc *desc, const struct nlattr *nla)
8535 {
8536         u8 genmask = nft_genmask_next(ctx->net);
8537         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8538         struct nft_chain *chain;
8539         int err;
8540
8541         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8542                                           nft_verdict_policy, NULL);
8543         if (err < 0)
8544                 return err;
8545
8546         if (!tb[NFTA_VERDICT_CODE])
8547                 return -EINVAL;
8548         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
8549
8550         switch (data->verdict.code) {
8551         default:
8552                 switch (data->verdict.code & NF_VERDICT_MASK) {
8553                 case NF_ACCEPT:
8554                 case NF_DROP:
8555                 case NF_QUEUE:
8556                         break;
8557                 default:
8558                         return -EINVAL;
8559                 }
8560                 fallthrough;
8561         case NFT_CONTINUE:
8562         case NFT_BREAK:
8563         case NFT_RETURN:
8564                 break;
8565         case NFT_JUMP:
8566         case NFT_GOTO:
8567                 if (tb[NFTA_VERDICT_CHAIN]) {
8568                         chain = nft_chain_lookup(ctx->net, ctx->table,
8569                                                  tb[NFTA_VERDICT_CHAIN],
8570                                                  genmask);
8571                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8572                         chain = nft_chain_lookup_byid(ctx->net,
8573                                                       tb[NFTA_VERDICT_CHAIN_ID]);
8574                         if (IS_ERR(chain))
8575                                 return PTR_ERR(chain);
8576                 } else {
8577                         return -EINVAL;
8578                 }
8579
8580                 if (IS_ERR(chain))
8581                         return PTR_ERR(chain);
8582                 if (nft_is_base_chain(chain))
8583                         return -EOPNOTSUPP;
8584
8585                 chain->use++;
8586                 data->verdict.chain = chain;
8587                 break;
8588         }
8589
8590         desc->len = sizeof(data->verdict);
8591         desc->type = NFT_DATA_VERDICT;
8592         return 0;
8593 }
8594
8595 static void nft_verdict_uninit(const struct nft_data *data)
8596 {
8597         struct nft_chain *chain;
8598         struct nft_rule *rule;
8599
8600         switch (data->verdict.code) {
8601         case NFT_JUMP:
8602         case NFT_GOTO:
8603                 chain = data->verdict.chain;
8604                 chain->use--;
8605
8606                 if (!nft_chain_is_bound(chain))
8607                         break;
8608
8609                 chain->table->use--;
8610                 list_for_each_entry(rule, &chain->rules, list)
8611                         chain->use--;
8612
8613                 nft_chain_del(chain);
8614                 break;
8615         }
8616 }
8617
8618 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
8619 {
8620         struct nlattr *nest;
8621
8622         nest = nla_nest_start_noflag(skb, type);
8623         if (!nest)
8624                 goto nla_put_failure;
8625
8626         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
8627                 goto nla_put_failure;
8628
8629         switch (v->code) {
8630         case NFT_JUMP:
8631         case NFT_GOTO:
8632                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
8633                                    v->chain->name))
8634                         goto nla_put_failure;
8635         }
8636         nla_nest_end(skb, nest);
8637         return 0;
8638
8639 nla_put_failure:
8640         return -1;
8641 }
8642
8643 static int nft_value_init(const struct nft_ctx *ctx,
8644                           struct nft_data *data, unsigned int size,
8645                           struct nft_data_desc *desc, const struct nlattr *nla)
8646 {
8647         unsigned int len;
8648
8649         len = nla_len(nla);
8650         if (len == 0)
8651                 return -EINVAL;
8652         if (len > size)
8653                 return -EOVERFLOW;
8654
8655         nla_memcpy(data->data, nla, len);
8656         desc->type = NFT_DATA_VALUE;
8657         desc->len  = len;
8658         return 0;
8659 }
8660
8661 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8662                           unsigned int len)
8663 {
8664         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8665 }
8666
8667 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
8668         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
8669         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
8670 };
8671
8672 /**
8673  *      nft_data_init - parse nf_tables data netlink attributes
8674  *
8675  *      @ctx: context of the expression using the data
8676  *      @data: destination struct nft_data
8677  *      @size: maximum data length
8678  *      @desc: data description
8679  *      @nla: netlink attribute containing data
8680  *
8681  *      Parse the netlink data attributes and initialize a struct nft_data.
8682  *      The type and length of data are returned in the data description.
8683  *
8684  *      The caller can indicate that it only wants to accept data of type
8685  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
8686  */
8687 int nft_data_init(const struct nft_ctx *ctx,
8688                   struct nft_data *data, unsigned int size,
8689                   struct nft_data_desc *desc, const struct nlattr *nla)
8690 {
8691         struct nlattr *tb[NFTA_DATA_MAX + 1];
8692         int err;
8693
8694         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8695                                           nft_data_policy, NULL);
8696         if (err < 0)
8697                 return err;
8698
8699         if (tb[NFTA_DATA_VALUE])
8700                 return nft_value_init(ctx, data, size, desc,
8701                                       tb[NFTA_DATA_VALUE]);
8702         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8703                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8704         return -EINVAL;
8705 }
8706 EXPORT_SYMBOL_GPL(nft_data_init);
8707
8708 /**
8709  *      nft_data_release - release a nft_data item
8710  *
8711  *      @data: struct nft_data to release
8712  *      @type: type of data
8713  *
8714  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8715  *      all others need to be released by calling this function.
8716  */
8717 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
8718 {
8719         if (type < NFT_DATA_VERDICT)
8720                 return;
8721         switch (type) {
8722         case NFT_DATA_VERDICT:
8723                 return nft_verdict_uninit(data);
8724         default:
8725                 WARN_ON(1);
8726         }
8727 }
8728 EXPORT_SYMBOL_GPL(nft_data_release);
8729
8730 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8731                   enum nft_data_types type, unsigned int len)
8732 {
8733         struct nlattr *nest;
8734         int err;
8735
8736         nest = nla_nest_start_noflag(skb, attr);
8737         if (nest == NULL)
8738                 return -1;
8739
8740         switch (type) {
8741         case NFT_DATA_VALUE:
8742                 err = nft_value_dump(skb, data, len);
8743                 break;
8744         case NFT_DATA_VERDICT:
8745                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
8746                 break;
8747         default:
8748                 err = -EINVAL;
8749                 WARN_ON(1);
8750         }
8751
8752         nla_nest_end(skb, nest);
8753         return err;
8754 }
8755 EXPORT_SYMBOL_GPL(nft_data_dump);
8756
8757 int __nft_release_basechain(struct nft_ctx *ctx)
8758 {
8759         struct nft_rule *rule, *nr;
8760
8761         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8762                 return 0;
8763
8764         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
8765         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
8766                 list_del(&rule->list);
8767                 ctx->chain->use--;
8768                 nf_tables_rule_release(ctx, rule);
8769         }
8770         nft_chain_del(ctx->chain);
8771         ctx->table->use--;
8772         nf_tables_chain_destroy(ctx);
8773
8774         return 0;
8775 }
8776 EXPORT_SYMBOL_GPL(__nft_release_basechain);
8777
8778 static void __nft_release_tables(struct net *net)
8779 {
8780         struct nft_flowtable *flowtable, *nf;
8781         struct nft_table *table, *nt;
8782         struct nft_chain *chain, *nc;
8783         struct nft_object *obj, *ne;
8784         struct nft_rule *rule, *nr;
8785         struct nft_set *set, *ns;
8786         struct nft_ctx ctx = {
8787                 .net    = net,
8788                 .family = NFPROTO_NETDEV,
8789         };
8790
8791         list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
8792                 ctx.family = table->family;
8793
8794                 list_for_each_entry(chain, &table->chains, list)
8795                         nf_tables_unregister_hook(net, table, chain);
8796                 /* No packets are walking on these chains anymore. */
8797                 ctx.table = table;
8798                 list_for_each_entry(chain, &table->chains, list) {
8799                         ctx.chain = chain;
8800                         list_for_each_entry_safe(rule, nr, &chain->rules, list) {
8801                                 list_del(&rule->list);
8802                                 chain->use--;
8803                                 nf_tables_rule_release(&ctx, rule);
8804                         }
8805                 }
8806                 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
8807                         list_del(&flowtable->list);
8808                         table->use--;
8809                         nf_tables_flowtable_destroy(flowtable);
8810                 }
8811                 list_for_each_entry_safe(set, ns, &table->sets, list) {
8812                         list_del(&set->list);
8813                         table->use--;
8814                         nft_set_destroy(&ctx, set);
8815                 }
8816                 list_for_each_entry_safe(obj, ne, &table->objects, list) {
8817                         nft_obj_del(obj);
8818                         table->use--;
8819                         nft_obj_destroy(&ctx, obj);
8820                 }
8821                 list_for_each_entry_safe(chain, nc, &table->chains, list) {
8822                         ctx.chain = chain;
8823                         nft_chain_del(chain);
8824                         table->use--;
8825                         nf_tables_chain_destroy(&ctx);
8826                 }
8827                 list_del(&table->list);
8828                 nf_tables_table_destroy(&ctx);
8829         }
8830 }
8831
8832 static int __net_init nf_tables_init_net(struct net *net)
8833 {
8834         INIT_LIST_HEAD(&net->nft.tables);
8835         INIT_LIST_HEAD(&net->nft.commit_list);
8836         INIT_LIST_HEAD(&net->nft.module_list);
8837         INIT_LIST_HEAD(&net->nft.notify_list);
8838         mutex_init(&net->nft.commit_mutex);
8839         net->nft.base_seq = 1;
8840         net->nft.validate_state = NFT_VALIDATE_SKIP;
8841
8842         return 0;
8843 }
8844
8845 static void __net_exit nf_tables_exit_net(struct net *net)
8846 {
8847         mutex_lock(&net->nft.commit_mutex);
8848         if (!list_empty(&net->nft.commit_list))
8849                 __nf_tables_abort(net, NFNL_ABORT_NONE);
8850         __nft_release_tables(net);
8851         mutex_unlock(&net->nft.commit_mutex);
8852         WARN_ON_ONCE(!list_empty(&net->nft.tables));
8853         WARN_ON_ONCE(!list_empty(&net->nft.module_list));
8854         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
8855 }
8856
8857 static struct pernet_operations nf_tables_net_ops = {
8858         .init   = nf_tables_init_net,
8859         .exit   = nf_tables_exit_net,
8860 };
8861
8862 static int __init nf_tables_module_init(void)
8863 {
8864         int err;
8865
8866         spin_lock_init(&nf_tables_destroy_list_lock);
8867         err = register_pernet_subsys(&nf_tables_net_ops);
8868         if (err < 0)
8869                 return err;
8870
8871         err = nft_chain_filter_init();
8872         if (err < 0)
8873                 goto err1;
8874
8875         err = nf_tables_core_module_init();
8876         if (err < 0)
8877                 goto err2;
8878
8879         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
8880         if (err < 0)
8881                 goto err3;
8882
8883         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
8884         if (err < 0)
8885                 goto err4;
8886
8887         err = nft_offload_init();
8888         if (err < 0)
8889                 goto err5;
8890
8891         /* must be last */
8892         err = nfnetlink_subsys_register(&nf_tables_subsys);
8893         if (err < 0)
8894                 goto err6;
8895
8896         nft_chain_route_init();
8897
8898         return err;
8899 err6:
8900         nft_offload_exit();
8901 err5:
8902         rhltable_destroy(&nft_objname_ht);
8903 err4:
8904         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8905 err3:
8906         nf_tables_core_module_exit();
8907 err2:
8908         nft_chain_filter_fini();
8909 err1:
8910         unregister_pernet_subsys(&nf_tables_net_ops);
8911         return err;
8912 }
8913
8914 static void __exit nf_tables_module_exit(void)
8915 {
8916         nfnetlink_subsys_unregister(&nf_tables_subsys);
8917         nft_offload_exit();
8918         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8919         nft_chain_filter_fini();
8920         nft_chain_route_fini();
8921         unregister_pernet_subsys(&nf_tables_net_ops);
8922         cancel_work_sync(&trans_destroy_work);
8923         rcu_barrier();
8924         rhltable_destroy(&nft_objname_ht);
8925         nf_tables_core_module_exit();
8926 }
8927
8928 module_init(nf_tables_module_init);
8929 module_exit(nf_tables_module_exit);
8930
8931 MODULE_LICENSE("GPL");
8932 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
8933 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);