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, u32 nlpid)
 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                         if (nft_table_has_owner(table) &&
 524                             table->nlpid != nlpid)
 525                                 return ERR_PTR(-EPERM);
 526
 527                         return table;
 528                 }
 529         }
 530
 531         return ERR_PTR(-ENOENT);
 532 }
 533
 534 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 535                                                    const struct nlattr *nla,
 536                                                    u8 genmask)
 537 {
 538         struct nft_table *table;
 539
 540         list_for_each_entry(table, &net->nft.tables, list) {
 541                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 542                     nft_active_genmask(table, genmask))
 543                         return table;
 544         }
 545
 546         return ERR_PTR(-ENOENT);
 547 }
 548
 549 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 550 {
 551         return ++table->hgenerator;
 552 }
 553
 554 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 555
 556 static const struct nft_chain_type *
 557 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 558 {
 559         if (family >= NFPROTO_NUMPROTO ||
 560             type >= NFT_CHAIN_T_MAX)
 561                 return NULL;
 562
 563         return chain_type[family][type];
 564 }
 565
 566 static const struct nft_chain_type *
 567 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 568 {
 569         const struct nft_chain_type *type;
 570         int i;
 571
 572         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 573                 type = __nft_chain_type_get(family, i);
 574                 if (!type)
 575                         continue;
 576                 if (!nla_strcmp(nla, type->name))
 577                         return type;
 578         }
 579         return NULL;
 580 }
 581
 582 struct nft_module_request {
 583         struct list_head        list;
 584         char                    module[MODULE_NAME_LEN];
 585         bool                    done;
 586 };
 587
 588 #ifdef CONFIG_MODULES
 589 static __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 590                                              ...)
 591 {
 592         char module_name[MODULE_NAME_LEN];
 593         struct nft_module_request *req;
 594         va_list args;
 595         int ret;
 596
 597         va_start(args, fmt);
 598         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 599         va_end(args);
 600         if (ret >= MODULE_NAME_LEN)
 601                 return 0;
 602
 603         list_for_each_entry(req, &net->nft.module_list, list) {
 604                 if (!strcmp(req->module, module_name)) {
 605                         if (req->done)
 606                                 return 0;
 607
 608                         /* A request to load this module already exists. */
 609                         return -EAGAIN;
 610                 }
 611         }
 612
 613         req = kmalloc(sizeof(*req), GFP_KERNEL);
 614         if (!req)
 615                 return -ENOMEM;
 616
 617         req->done = false;
 618         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 619         list_add_tail(&req->list, &net->nft.module_list);
 620
 621         return -EAGAIN;
 622 }
 623 #endif
 624
 625 static void lockdep_nfnl_nft_mutex_not_held(void)
 626 {
 627 #ifdef CONFIG_PROVE_LOCKING
 628         if (debug_locks)
 629                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 630 #endif
 631 }
 632
 633 static const struct nft_chain_type *
 634 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 635                             u8 family, bool autoload)
 636 {
 637         const struct nft_chain_type *type;
 638
 639         type = __nf_tables_chain_type_lookup(nla, family);
 640         if (type != NULL)
 641                 return type;
 642
 643         lockdep_nfnl_nft_mutex_not_held();
 644 #ifdef CONFIG_MODULES
 645         if (autoload) {
 646                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 647                                        nla_len(nla),
 648                                        (const char *)nla_data(nla)) == -EAGAIN)
 649                         return ERR_PTR(-EAGAIN);
 650         }
 651 #endif
 652         return ERR_PTR(-ENOENT);
 653 }
 654
 655 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 656         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 657                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 658         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 659         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 660         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 661                                     .len = NFT_USERDATA_MAXLEN }
 662 };
 663
 664 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 665                                      u32 portid, u32 seq, int event, u32 flags,
 666                                      int family, const struct nft_table *table)
 667 {
 668         struct nlmsghdr *nlh;
 669         struct nfgenmsg *nfmsg;
 670
 671         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 672         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
 673         if (nlh == NULL)
 674                 goto nla_put_failure;
 675
 676         nfmsg = nlmsg_data(nlh);
 677         nfmsg->nfgen_family     = family;
 678         nfmsg->version          = NFNETLINK_V0;
 679         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
 680
 681         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 682             nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
 683             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 684             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 685                          NFTA_TABLE_PAD))
 686                 goto nla_put_failure;
 687         if (nft_table_has_owner(table) &&
 688             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 689                 goto nla_put_failure;
 690
 691         if (table->udata) {
 692                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 693                         goto nla_put_failure;
 694         }
 695
 696         nlmsg_end(skb, nlh);
 697         return 0;
 698
 699 nla_put_failure:
 700         nlmsg_trim(skb, nlh);
 701         return -1;
 702 }
 703
 704 struct nftnl_skb_parms {
 705         bool report;
 706 };
 707 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 708
 709 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 710                                struct list_head *notify_list)
 711 {
 712         NFT_CB(skb).report = report;
 713         list_add_tail(&skb->list, notify_list);
 714 }
 715
 716 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 717 {
 718         struct sk_buff *skb;
 719         int err;
 720         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
 721                               ctx->table->name, ctx->table->handle);
 722
 723         audit_log_nfcfg(buf,
 724                         ctx->family,
 725                         ctx->table->use,
 726                         event == NFT_MSG_NEWTABLE ?
 727                                 AUDIT_NFT_OP_TABLE_REGISTER :
 728                                 AUDIT_NFT_OP_TABLE_UNREGISTER,
 729                         GFP_KERNEL);
 730         kfree(buf);
 731
 732         if (!ctx->report &&
 733             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 734                 return;
 735
 736         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 737         if (skb == NULL)
 738                 goto err;
 739
 740         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 741                                         event, 0, ctx->family, ctx->table);
 742         if (err < 0) {
 743                 kfree_skb(skb);
 744                 goto err;
 745         }
 746
 747         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
 748         return;
 749 err:
 750         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 751 }
 752
 753 static int nf_tables_dump_tables(struct sk_buff *skb,
 754                                  struct netlink_callback *cb)
 755 {
 756         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 757         const struct nft_table *table;
 758         unsigned int idx = 0, s_idx = cb->args[0];
 759         struct net *net = sock_net(skb->sk);
 760         int family = nfmsg->nfgen_family;
 761
 762         rcu_read_lock();
 763         cb->seq = net->nft.base_seq;
 764
 765         list_for_each_entry_rcu(table, &net->nft.tables, list) {
 766                 if (family != NFPROTO_UNSPEC && family != table->family)
 767                         continue;
 768
 769                 if (idx < s_idx)
 770                         goto cont;
 771                 if (idx > s_idx)
 772                         memset(&cb->args[1], 0,
 773                                sizeof(cb->args) - sizeof(cb->args[0]));
 774                 if (!nft_is_active(net, table))
 775                         continue;
 776                 if (nf_tables_fill_table_info(skb, net,
 777                                               NETLINK_CB(cb->skb).portid,
 778                                               cb->nlh->nlmsg_seq,
 779                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 780                                               table->family, table) < 0)
 781                         goto done;
 782
 783                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 784 cont:
 785                 idx++;
 786         }
 787 done:
 788         rcu_read_unlock();
 789         cb->args[0] = idx;
 790         return skb->len;
 791 }
 792
 793 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 794                                       const struct nlmsghdr *nlh,
 795                                       struct netlink_dump_control *c)
 796 {
 797         int err;
 798
 799         if (!try_module_get(THIS_MODULE))
 800                 return -EINVAL;
 801
 802         rcu_read_unlock();
 803         err = netlink_dump_start(nlsk, skb, nlh, c);
 804         rcu_read_lock();
 805         module_put(THIS_MODULE);
 806
 807         return err;
 808 }
 809
 810 /* called with rcu_read_lock held */
 811 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
 812                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 813                               const struct nlattr * const nla[],
 814                               struct netlink_ext_ack *extack)
 815 {
 816         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 817         u8 genmask = nft_genmask_cur(net);
 818         const struct nft_table *table;
 819         struct sk_buff *skb2;
 820         int family = nfmsg->nfgen_family;
 821         int err;
 822
 823         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 824                 struct netlink_dump_control c = {
 825                         .dump = nf_tables_dump_tables,
 826                         .module = THIS_MODULE,
 827                 };
 828
 829                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
 830         }
 831
 832         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 833         if (IS_ERR(table)) {
 834                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 835                 return PTR_ERR(table);
 836         }
 837
 838         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 839         if (!skb2)
 840                 return -ENOMEM;
 841
 842         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 843                                         nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
 844                                         family, table);
 845         if (err < 0)
 846                 goto err_fill_table_info;
 847
 848         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 849
 850 err_fill_table_info:
 851         kfree_skb(skb2);
 852         return err;
 853 }
 854
 855 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 856 {
 857         struct nft_chain *chain;
 858         u32 i = 0;
 859
 860         list_for_each_entry(chain, &table->chains, list) {
 861                 if (!nft_is_active_next(net, chain))
 862                         continue;
 863                 if (!nft_is_base_chain(chain))
 864                         continue;
 865
 866                 if (cnt && i++ == cnt)
 867                         break;
 868
 869                 nf_tables_unregister_hook(net, table, chain);
 870         }
 871 }
 872
 873 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 874 {
 875         struct nft_chain *chain;
 876         int err, i = 0;
 877
 878         list_for_each_entry(chain, &table->chains, list) {
 879                 if (!nft_is_active_next(net, chain))
 880                         continue;
 881                 if (!nft_is_base_chain(chain))
 882                         continue;
 883
 884                 err = nf_tables_register_hook(net, table, chain);
 885                 if (err < 0)
 886                         goto err_register_hooks;
 887
 888                 i++;
 889         }
 890         return 0;
 891
 892 err_register_hooks:
 893         if (i)
 894                 nft_table_disable(net, table, i);
 895         return err;
 896 }
 897
 898 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 899 {
 900         nft_table_disable(net, table, 0);
 901 }
 902
 903 static int nf_tables_updtable(struct nft_ctx *ctx)
 904 {
 905         struct nft_trans *trans;
 906         u32 flags;
 907         int ret = 0;
 908
 909         if (!ctx->nla[NFTA_TABLE_FLAGS])
 910                 return 0;
 911
 912         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
 913         if (flags & ~NFT_TABLE_F_MASK)
 914                 return -EOPNOTSUPP;
 915
 916         if (flags == ctx->table->flags)
 917                 return 0;
 918
 919         if ((nft_table_has_owner(ctx->table) &&
 920              !(flags & NFT_TABLE_F_OWNER)) ||
 921             (!nft_table_has_owner(ctx->table) &&
 922              flags & NFT_TABLE_F_OWNER))
 923                 return -EOPNOTSUPP;
 924
 925         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
 926                                 sizeof(struct nft_trans_table));
 927         if (trans == NULL)
 928                 return -ENOMEM;
 929
 930         if ((flags & NFT_TABLE_F_DORMANT) &&
 931             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
 932                 nft_trans_table_enable(trans) = false;
 933         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
 934                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
 935                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
 936                 ret = nf_tables_table_enable(ctx->net, ctx->table);
 937                 if (ret >= 0)
 938                         nft_trans_table_enable(trans) = true;
 939                 else
 940                         ctx->table->flags |= NFT_TABLE_F_DORMANT;
 941         }
 942         if (ret < 0)
 943                 goto err;
 944
 945         nft_trans_table_update(trans) = true;
 946         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 947         return 0;
 948 err:
 949         nft_trans_destroy(trans);
 950         return ret;
 951 }
 952
 953 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
 954 {
 955         const char *name = data;
 956
 957         return jhash(name, strlen(name), seed);
 958 }
 959
 960 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
 961 {
 962         const struct nft_chain *chain = data;
 963
 964         return nft_chain_hash(chain->name, 0, seed);
 965 }
 966
 967 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
 968                               const void *ptr)
 969 {
 970         const struct nft_chain *chain = ptr;
 971         const char *name = arg->key;
 972
 973         return strcmp(chain->name, name);
 974 }
 975
 976 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
 977 {
 978         const struct nft_object_hash_key *k = data;
 979
 980         seed ^= hash_ptr(k->table, 32);
 981
 982         return jhash(k->name, strlen(k->name), seed);
 983 }
 984
 985 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
 986 {
 987         const struct nft_object *obj = data;
 988
 989         return nft_objname_hash(&obj->key, 0, seed);
 990 }
 991
 992 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
 993                                 const void *ptr)
 994 {
 995         const struct nft_object_hash_key *k = arg->key;
 996         const struct nft_object *obj = ptr;
 997
 998         if (obj->key.table != k->table)
 999                 return -1;
1000
1001         return strcmp(obj->key.name, k->name);
1002 }
1003
1004 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
1005                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1006                               const struct nlattr * const nla[],
1007                               struct netlink_ext_ack *extack)
1008 {
1009         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1010         u8 genmask = nft_genmask_next(net);
1011         int family = nfmsg->nfgen_family;
1012         const struct nlattr *attr;
1013         struct nft_table *table;
1014         struct nft_ctx ctx;
1015         u32 flags = 0;
1016         int err;
1017
1018         lockdep_assert_held(&net->nft.commit_mutex);
1019         attr = nla[NFTA_TABLE_NAME];
1020         table = nft_table_lookup(net, attr, family, genmask,
1021                                  NETLINK_CB(skb).portid);
1022         if (IS_ERR(table)) {
1023                 if (PTR_ERR(table) != -ENOENT)
1024                         return PTR_ERR(table);
1025         } else {
1026                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1027                         NL_SET_BAD_ATTR(extack, attr);
1028                         return -EEXIST;
1029                 }
1030                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1031                         return -EOPNOTSUPP;
1032
1033                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1034                 return nf_tables_updtable(&ctx);
1035         }
1036
1037         if (nla[NFTA_TABLE_FLAGS]) {
1038                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1039                 if (flags & ~NFT_TABLE_F_MASK)
1040                         return -EOPNOTSUPP;
1041         }
1042
1043         err = -ENOMEM;
1044         table = kzalloc(sizeof(*table), GFP_KERNEL);
1045         if (table == NULL)
1046                 goto err_kzalloc;
1047
1048         table->name = nla_strdup(attr, GFP_KERNEL);
1049         if (table->name == NULL)
1050                 goto err_strdup;
1051
1052         if (nla[NFTA_TABLE_USERDATA]) {
1053                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1054                 if (table->udata == NULL)
1055                         goto err_table_udata;
1056
1057                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1058         }
1059
1060         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1061         if (err)
1062                 goto err_chain_ht;
1063
1064         INIT_LIST_HEAD(&table->chains);
1065         INIT_LIST_HEAD(&table->sets);
1066         INIT_LIST_HEAD(&table->objects);
1067         INIT_LIST_HEAD(&table->flowtables);
1068         table->family = family;
1069         table->flags = flags;
1070         table->handle = ++table_handle;
1071         if (table->flags & NFT_TABLE_F_OWNER)
1072                 table->nlpid = NETLINK_CB(skb).portid;
1073
1074         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1075         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1076         if (err < 0)
1077                 goto err_trans;
1078
1079         list_add_tail_rcu(&table->list, &net->nft.tables);
1080         return 0;
1081 err_trans:
1082         rhltable_destroy(&table->chains_ht);
1083 err_chain_ht:
1084         kfree(table->udata);
1085 err_table_udata:
1086         kfree(table->name);
1087 err_strdup:
1088         kfree(table);
1089 err_kzalloc:
1090         return err;
1091 }
1092
1093 static int nft_flush_table(struct nft_ctx *ctx)
1094 {
1095         struct nft_flowtable *flowtable, *nft;
1096         struct nft_chain *chain, *nc;
1097         struct nft_object *obj, *ne;
1098         struct nft_set *set, *ns;
1099         int err;
1100
1101         list_for_each_entry(chain, &ctx->table->chains, list) {
1102                 if (!nft_is_active_next(ctx->net, chain))
1103                         continue;
1104
1105                 if (nft_chain_is_bound(chain))
1106                         continue;
1107
1108                 ctx->chain = chain;
1109
1110                 err = nft_delrule_by_chain(ctx);
1111                 if (err < 0)
1112                         goto out;
1113         }
1114
1115         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1116                 if (!nft_is_active_next(ctx->net, set))
1117                         continue;
1118
1119                 if (nft_set_is_anonymous(set) &&
1120                     !list_empty(&set->bindings))
1121                         continue;
1122
1123                 err = nft_delset(ctx, set);
1124                 if (err < 0)
1125                         goto out;
1126         }
1127
1128         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1129                 if (!nft_is_active_next(ctx->net, flowtable))
1130                         continue;
1131
1132                 err = nft_delflowtable(ctx, flowtable);
1133                 if (err < 0)
1134                         goto out;
1135         }
1136
1137         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1138                 if (!nft_is_active_next(ctx->net, obj))
1139                         continue;
1140
1141                 err = nft_delobj(ctx, obj);
1142                 if (err < 0)
1143                         goto out;
1144         }
1145
1146         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1147                 if (!nft_is_active_next(ctx->net, chain))
1148                         continue;
1149
1150                 if (nft_chain_is_bound(chain))
1151                         continue;
1152
1153                 ctx->chain = chain;
1154
1155                 err = nft_delchain(ctx);
1156                 if (err < 0)
1157                         goto out;
1158         }
1159
1160         err = nft_deltable(ctx);
1161 out:
1162         return err;
1163 }
1164
1165 static int nft_flush(struct nft_ctx *ctx, int family)
1166 {
1167         struct nft_table *table, *nt;
1168         const struct nlattr * const *nla = ctx->nla;
1169         int err = 0;
1170
1171         list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1172                 if (family != AF_UNSPEC && table->family != family)
1173                         continue;
1174
1175                 ctx->family = table->family;
1176
1177                 if (!nft_is_active_next(ctx->net, table))
1178                         continue;
1179
1180                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1181                         continue;
1182
1183                 if (nla[NFTA_TABLE_NAME] &&
1184                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1185                         continue;
1186
1187                 ctx->table = table;
1188
1189                 err = nft_flush_table(ctx);
1190                 if (err < 0)
1191                         goto out;
1192         }
1193 out:
1194         return err;
1195 }
1196
1197 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1198                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1199                               const struct nlattr * const nla[],
1200                               struct netlink_ext_ack *extack)
1201 {
1202         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1203         u8 genmask = nft_genmask_next(net);
1204         int family = nfmsg->nfgen_family;
1205         const struct nlattr *attr;
1206         struct nft_table *table;
1207         struct nft_ctx ctx;
1208
1209         nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1210         if (family == AF_UNSPEC ||
1211             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1212                 return nft_flush(&ctx, family);
1213
1214         if (nla[NFTA_TABLE_HANDLE]) {
1215                 attr = nla[NFTA_TABLE_HANDLE];
1216                 table = nft_table_lookup_byhandle(net, attr, genmask);
1217         } else {
1218                 attr = nla[NFTA_TABLE_NAME];
1219                 table = nft_table_lookup(net, attr, family, genmask,
1220                                          NETLINK_CB(skb).portid);
1221         }
1222
1223         if (IS_ERR(table)) {
1224                 NL_SET_BAD_ATTR(extack, attr);
1225                 return PTR_ERR(table);
1226         }
1227
1228         if (nlh->nlmsg_flags & NLM_F_NONREC &&
1229             table->use > 0)
1230                 return -EBUSY;
1231
1232         ctx.family = family;
1233         ctx.table = table;
1234
1235         return nft_flush_table(&ctx);
1236 }
1237
1238 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1239 {
1240         if (WARN_ON(ctx->table->use > 0))
1241                 return;
1242
1243         rhltable_destroy(&ctx->table->chains_ht);
1244         kfree(ctx->table->name);
1245         kfree(ctx->table->udata);
1246         kfree(ctx->table);
1247 }
1248
1249 void nft_register_chain_type(const struct nft_chain_type *ctype)
1250 {
1251         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1252         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1253                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1254                 return;
1255         }
1256         chain_type[ctype->family][ctype->type] = ctype;
1257         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1258 }
1259 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1260
1261 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1262 {
1263         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1264         chain_type[ctype->family][ctype->type] = NULL;
1265         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1266 }
1267 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1268
1269 /*
1270  * Chains
1271  */
1272
1273 static struct nft_chain *
1274 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1275 {
1276         struct nft_chain *chain;
1277
1278         list_for_each_entry(chain, &table->chains, list) {
1279                 if (chain->handle == handle &&
1280                     nft_active_genmask(chain, genmask))
1281                         return chain;
1282         }
1283
1284         return ERR_PTR(-ENOENT);
1285 }
1286
1287 static bool lockdep_commit_lock_is_held(const struct net *net)
1288 {
1289 #ifdef CONFIG_PROVE_LOCKING
1290         return lockdep_is_held(&net->nft.commit_mutex);
1291 #else
1292         return true;
1293 #endif
1294 }
1295
1296 static struct nft_chain *nft_chain_lookup(struct net *net,
1297                                           struct nft_table *table,
1298                                           const struct nlattr *nla, u8 genmask)
1299 {
1300         char search[NFT_CHAIN_MAXNAMELEN + 1];
1301         struct rhlist_head *tmp, *list;
1302         struct nft_chain *chain;
1303
1304         if (nla == NULL)
1305                 return ERR_PTR(-EINVAL);
1306
1307         nla_strscpy(search, nla, sizeof(search));
1308
1309         WARN_ON(!rcu_read_lock_held() &&
1310                 !lockdep_commit_lock_is_held(net));
1311
1312         chain = ERR_PTR(-ENOENT);
1313         rcu_read_lock();
1314         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1315         if (!list)
1316                 goto out_unlock;
1317
1318         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1319                 if (nft_active_genmask(chain, genmask))
1320                         goto out_unlock;
1321         }
1322         chain = ERR_PTR(-ENOENT);
1323 out_unlock:
1324         rcu_read_unlock();
1325         return chain;
1326 }
1327
1328 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1329         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1330                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1331         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1332         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1333                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1334         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1335         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1336         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1337                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1338         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1339         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1340         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1341         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1342                                     .len = NFT_USERDATA_MAXLEN },
1343 };
1344
1345 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1346         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1347         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1348         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1349                                     .len = IFNAMSIZ - 1 },
1350 };
1351
1352 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1353 {
1354         struct nft_stats *cpu_stats, total;
1355         struct nlattr *nest;
1356         unsigned int seq;
1357         u64 pkts, bytes;
1358         int cpu;
1359
1360         if (!stats)
1361                 return 0;
1362
1363         memset(&total, 0, sizeof(total));
1364         for_each_possible_cpu(cpu) {
1365                 cpu_stats = per_cpu_ptr(stats, cpu);
1366                 do {
1367                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1368                         pkts = cpu_stats->pkts;
1369                         bytes = cpu_stats->bytes;
1370                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1371                 total.pkts += pkts;
1372                 total.bytes += bytes;
1373         }
1374         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1375         if (nest == NULL)
1376                 goto nla_put_failure;
1377
1378         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1379                          NFTA_COUNTER_PAD) ||
1380             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1381                          NFTA_COUNTER_PAD))
1382                 goto nla_put_failure;
1383
1384         nla_nest_end(skb, nest);
1385         return 0;
1386
1387 nla_put_failure:
1388         return -ENOSPC;
1389 }
1390
1391 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1392                                    const struct nft_base_chain *basechain)
1393 {
1394         const struct nf_hook_ops *ops = &basechain->ops;
1395         struct nft_hook *hook, *first = NULL;
1396         struct nlattr *nest, *nest_devs;
1397         int n = 0;
1398
1399         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1400         if (nest == NULL)
1401                 goto nla_put_failure;
1402         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1403                 goto nla_put_failure;
1404         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1405                 goto nla_put_failure;
1406
1407         if (nft_base_chain_netdev(family, ops->hooknum)) {
1408                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1409                 list_for_each_entry(hook, &basechain->hook_list, list) {
1410                         if (!first)
1411                                 first = hook;
1412
1413                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1414                                            hook->ops.dev->name))
1415                                 goto nla_put_failure;
1416                         n++;
1417                 }
1418                 nla_nest_end(skb, nest_devs);
1419
1420                 if (n == 1 &&
1421                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1422                         goto nla_put_failure;
1423         }
1424         nla_nest_end(skb, nest);
1425
1426         return 0;
1427 nla_put_failure:
1428         return -1;
1429 }
1430
1431 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1432                                      u32 portid, u32 seq, int event, u32 flags,
1433                                      int family, const struct nft_table *table,
1434                                      const struct nft_chain *chain)
1435 {
1436         struct nlmsghdr *nlh;
1437         struct nfgenmsg *nfmsg;
1438
1439         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1440         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1441         if (nlh == NULL)
1442                 goto nla_put_failure;
1443
1444         nfmsg = nlmsg_data(nlh);
1445         nfmsg->nfgen_family     = family;
1446         nfmsg->version          = NFNETLINK_V0;
1447         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
1448
1449         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1450                 goto nla_put_failure;
1451         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1452                          NFTA_CHAIN_PAD))
1453                 goto nla_put_failure;
1454         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1455                 goto nla_put_failure;
1456
1457         if (nft_is_base_chain(chain)) {
1458                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1459                 struct nft_stats __percpu *stats;
1460
1461                 if (nft_dump_basechain_hook(skb, family, basechain))
1462                         goto nla_put_failure;
1463
1464                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1465                                  htonl(basechain->policy)))
1466                         goto nla_put_failure;
1467
1468                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1469                         goto nla_put_failure;
1470
1471                 stats = rcu_dereference_check(basechain->stats,
1472                                               lockdep_commit_lock_is_held(net));
1473                 if (nft_dump_stats(skb, stats))
1474                         goto nla_put_failure;
1475         }
1476
1477         if (chain->flags &&
1478             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1479                 goto nla_put_failure;
1480
1481         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1482                 goto nla_put_failure;
1483
1484         if (chain->udata &&
1485             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1486                 goto nla_put_failure;
1487
1488         nlmsg_end(skb, nlh);
1489         return 0;
1490
1491 nla_put_failure:
1492         nlmsg_trim(skb, nlh);
1493         return -1;
1494 }
1495
1496 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1497 {
1498         struct sk_buff *skb;
1499         int err;
1500         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
1501                               ctx->table->name, ctx->table->handle,
1502                               ctx->chain->name, ctx->chain->handle);
1503
1504         audit_log_nfcfg(buf,
1505                         ctx->family,
1506                         ctx->chain->use,
1507                         event == NFT_MSG_NEWCHAIN ?
1508                                 AUDIT_NFT_OP_CHAIN_REGISTER :
1509                                 AUDIT_NFT_OP_CHAIN_UNREGISTER,
1510                         GFP_KERNEL);
1511         kfree(buf);
1512
1513         if (!ctx->report &&
1514             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1515                 return;
1516
1517         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1518         if (skb == NULL)
1519                 goto err;
1520
1521         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1522                                         event, 0, ctx->family, ctx->table,
1523                                         ctx->chain);
1524         if (err < 0) {
1525                 kfree_skb(skb);
1526                 goto err;
1527         }
1528
1529         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
1530         return;
1531 err:
1532         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1533 }
1534
1535 static int nf_tables_dump_chains(struct sk_buff *skb,
1536                                  struct netlink_callback *cb)
1537 {
1538         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1539         const struct nft_table *table;
1540         const struct nft_chain *chain;
1541         unsigned int idx = 0, s_idx = cb->args[0];
1542         struct net *net = sock_net(skb->sk);
1543         int family = nfmsg->nfgen_family;
1544
1545         rcu_read_lock();
1546         cb->seq = net->nft.base_seq;
1547
1548         list_for_each_entry_rcu(table, &net->nft.tables, list) {
1549                 if (family != NFPROTO_UNSPEC && family != table->family)
1550                         continue;
1551
1552                 list_for_each_entry_rcu(chain, &table->chains, list) {
1553                         if (idx < s_idx)
1554                                 goto cont;
1555                         if (idx > s_idx)
1556                                 memset(&cb->args[1], 0,
1557                                        sizeof(cb->args) - sizeof(cb->args[0]));
1558                         if (!nft_is_active(net, chain))
1559                                 continue;
1560                         if (nf_tables_fill_chain_info(skb, net,
1561                                                       NETLINK_CB(cb->skb).portid,
1562                                                       cb->nlh->nlmsg_seq,
1563                                                       NFT_MSG_NEWCHAIN,
1564                                                       NLM_F_MULTI,
1565                                                       table->family, table,
1566                                                       chain) < 0)
1567                                 goto done;
1568
1569                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1570 cont:
1571                         idx++;
1572                 }
1573         }
1574 done:
1575         rcu_read_unlock();
1576         cb->args[0] = idx;
1577         return skb->len;
1578 }
1579
1580 /* called with rcu_read_lock held */
1581 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1582                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1583                               const struct nlattr * const nla[],
1584                               struct netlink_ext_ack *extack)
1585 {
1586         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1587         u8 genmask = nft_genmask_cur(net);
1588         const struct nft_chain *chain;
1589         struct nft_table *table;
1590         struct sk_buff *skb2;
1591         int family = nfmsg->nfgen_family;
1592         int err;
1593
1594         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1595                 struct netlink_dump_control c = {
1596                         .dump = nf_tables_dump_chains,
1597                         .module = THIS_MODULE,
1598                 };
1599
1600                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1601         }
1602
1603         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1604         if (IS_ERR(table)) {
1605                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1606                 return PTR_ERR(table);
1607         }
1608
1609         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1610         if (IS_ERR(chain)) {
1611                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1612                 return PTR_ERR(chain);
1613         }
1614
1615         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1616         if (!skb2)
1617                 return -ENOMEM;
1618
1619         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1620                                         nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1621                                         family, table, chain);
1622         if (err < 0)
1623                 goto err_fill_chain_info;
1624
1625         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1626
1627 err_fill_chain_info:
1628         kfree_skb(skb2);
1629         return err;
1630 }
1631
1632 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1633         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1634         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1635 };
1636
1637 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1638 {
1639         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1640         struct nft_stats __percpu *newstats;
1641         struct nft_stats *stats;
1642         int err;
1643
1644         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1645                                           nft_counter_policy, NULL);
1646         if (err < 0)
1647                 return ERR_PTR(err);
1648
1649         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1650                 return ERR_PTR(-EINVAL);
1651
1652         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1653         if (newstats == NULL)
1654                 return ERR_PTR(-ENOMEM);
1655
1656         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1657          * are not exposed to userspace.
1658          */
1659         preempt_disable();
1660         stats = this_cpu_ptr(newstats);
1661         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1662         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1663         preempt_enable();
1664
1665         return newstats;
1666 }
1667
1668 static void nft_chain_stats_replace(struct nft_trans *trans)
1669 {
1670         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1671
1672         if (!nft_trans_chain_stats(trans))
1673                 return;
1674
1675         nft_trans_chain_stats(trans) =
1676                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1677                                     lockdep_commit_lock_is_held(trans->ctx.net));
1678
1679         if (!nft_trans_chain_stats(trans))
1680                 static_branch_inc(&nft_counters_enabled);
1681 }
1682
1683 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1684 {
1685         struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1686         struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1687
1688         if (g0 != g1)
1689                 kvfree(g1);
1690         kvfree(g0);
1691
1692         /* should be NULL either via abort or via successful commit */
1693         WARN_ON_ONCE(chain->rules_next);
1694         kvfree(chain->rules_next);
1695 }
1696
1697 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1698 {
1699         struct nft_chain *chain = ctx->chain;
1700         struct nft_hook *hook, *next;
1701
1702         if (WARN_ON(chain->use > 0))
1703                 return;
1704
1705         /* no concurrent access possible anymore */
1706         nf_tables_chain_free_chain_rules(chain);
1707
1708         if (nft_is_base_chain(chain)) {
1709                 struct nft_base_chain *basechain = nft_base_chain(chain);
1710
1711                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1712                         list_for_each_entry_safe(hook, next,
1713                                                  &basechain->hook_list, list) {
1714                                 list_del_rcu(&hook->list);
1715                                 kfree_rcu(hook, rcu);
1716                         }
1717                 }
1718                 module_put(basechain->type->owner);
1719                 if (rcu_access_pointer(basechain->stats)) {
1720                         static_branch_dec(&nft_counters_enabled);
1721                         free_percpu(rcu_dereference_raw(basechain->stats));
1722                 }
1723                 kfree(chain->name);
1724                 kfree(chain->udata);
1725                 kfree(basechain);
1726         } else {
1727                 kfree(chain->name);
1728                 kfree(chain->udata);
1729                 kfree(chain);
1730         }
1731 }
1732
1733 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1734                                               const struct nlattr *attr)
1735 {
1736         struct net_device *dev;
1737         char ifname[IFNAMSIZ];
1738         struct nft_hook *hook;
1739         int err;
1740
1741         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1742         if (!hook) {
1743                 err = -ENOMEM;
1744                 goto err_hook_alloc;
1745         }
1746
1747         nla_strscpy(ifname, attr, IFNAMSIZ);
1748         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1749          * indirectly serializing all the other holders of the commit_mutex with
1750          * the rtnl_mutex.
1751          */
1752         dev = __dev_get_by_name(net, ifname);
1753         if (!dev) {
1754                 err = -ENOENT;
1755                 goto err_hook_dev;
1756         }
1757         hook->ops.dev = dev;
1758         hook->inactive = false;
1759
1760         return hook;
1761
1762 err_hook_dev:
1763         kfree(hook);
1764 err_hook_alloc:
1765         return ERR_PTR(err);
1766 }
1767
1768 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1769                                            const struct nft_hook *this)
1770 {
1771         struct nft_hook *hook;
1772
1773         list_for_each_entry(hook, hook_list, list) {
1774                 if (this->ops.dev == hook->ops.dev)
1775                         return hook;
1776         }
1777
1778         return NULL;
1779 }
1780
1781 static int nf_tables_parse_netdev_hooks(struct net *net,
1782                                         const struct nlattr *attr,
1783                                         struct list_head *hook_list)
1784 {
1785         struct nft_hook *hook, *next;
1786         const struct nlattr *tmp;
1787         int rem, n = 0, err;
1788
1789         nla_for_each_nested(tmp, attr, rem) {
1790                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1791                         err = -EINVAL;
1792                         goto err_hook;
1793                 }
1794
1795                 hook = nft_netdev_hook_alloc(net, tmp);
1796                 if (IS_ERR(hook)) {
1797                         err = PTR_ERR(hook);
1798                         goto err_hook;
1799                 }
1800                 if (nft_hook_list_find(hook_list, hook)) {
1801                         kfree(hook);
1802                         err = -EEXIST;
1803                         goto err_hook;
1804                 }
1805                 list_add_tail(&hook->list, hook_list);
1806                 n++;
1807
1808                 if (n == NFT_NETDEVICE_MAX) {
1809                         err = -EFBIG;
1810                         goto err_hook;
1811                 }
1812         }
1813
1814         return 0;
1815
1816 err_hook:
1817         list_for_each_entry_safe(hook, next, hook_list, list) {
1818                 list_del(&hook->list);
1819                 kfree(hook);
1820         }
1821         return err;
1822 }
1823
1824 struct nft_chain_hook {
1825         u32                             num;
1826         s32                             priority;
1827         const struct nft_chain_type     *type;
1828         struct list_head                list;
1829 };
1830
1831 static int nft_chain_parse_netdev(struct net *net,
1832                                   struct nlattr *tb[],
1833                                   struct list_head *hook_list)
1834 {
1835         struct nft_hook *hook;
1836         int err;
1837
1838         if (tb[NFTA_HOOK_DEV]) {
1839                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1840                 if (IS_ERR(hook))
1841                         return PTR_ERR(hook);
1842
1843                 list_add_tail(&hook->list, hook_list);
1844         } else if (tb[NFTA_HOOK_DEVS]) {
1845                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1846                                                    hook_list);
1847                 if (err < 0)
1848                         return err;
1849
1850                 if (list_empty(hook_list))
1851                         return -EINVAL;
1852         } else {
1853                 return -EINVAL;
1854         }
1855
1856         return 0;
1857 }
1858
1859 static int nft_chain_parse_hook(struct net *net,
1860                                 const struct nlattr * const nla[],
1861                                 struct nft_chain_hook *hook, u8 family,
1862                                 bool autoload)
1863 {
1864         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1865         const struct nft_chain_type *type;
1866         int err;
1867
1868         lockdep_assert_held(&net->nft.commit_mutex);
1869         lockdep_nfnl_nft_mutex_not_held();
1870
1871         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1872                                           nla[NFTA_CHAIN_HOOK],
1873                                           nft_hook_policy, NULL);
1874         if (err < 0)
1875                 return err;
1876
1877         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1878             ha[NFTA_HOOK_PRIORITY] == NULL)
1879                 return -EINVAL;
1880
1881         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1882         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1883
1884         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1885         if (!type)
1886                 return -EOPNOTSUPP;
1887
1888         if (nla[NFTA_CHAIN_TYPE]) {
1889                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1890                                                    family, autoload);
1891                 if (IS_ERR(type))
1892                         return PTR_ERR(type);
1893         }
1894         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1895                 return -EOPNOTSUPP;
1896
1897         if (type->type == NFT_CHAIN_T_NAT &&
1898             hook->priority <= NF_IP_PRI_CONNTRACK)
1899                 return -EOPNOTSUPP;
1900
1901         if (!try_module_get(type->owner))
1902                 return -ENOENT;
1903
1904         hook->type = type;
1905
1906         INIT_LIST_HEAD(&hook->list);
1907         if (nft_base_chain_netdev(family, hook->num)) {
1908                 err = nft_chain_parse_netdev(net, ha, &hook->list);
1909                 if (err < 0) {
1910                         module_put(type->owner);
1911                         return err;
1912                 }
1913         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1914                 module_put(type->owner);
1915                 return -EOPNOTSUPP;
1916         }
1917
1918         return 0;
1919 }
1920
1921 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1922 {
1923         struct nft_hook *h, *next;
1924
1925         list_for_each_entry_safe(h, next, &hook->list, list) {
1926                 list_del(&h->list);
1927                 kfree(h);
1928         }
1929         module_put(hook->type->owner);
1930 }
1931
1932 struct nft_rules_old {
1933         struct rcu_head h;
1934         struct nft_rule **start;
1935 };
1936
1937 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1938                                                      unsigned int alloc)
1939 {
1940         if (alloc > INT_MAX)
1941                 return NULL;
1942
1943         alloc += 1;     /* NULL, ends rules */
1944         if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1945                 return NULL;
1946
1947         alloc *= sizeof(struct nft_rule *);
1948         alloc += sizeof(struct nft_rules_old);
1949
1950         return kvmalloc(alloc, GFP_KERNEL);
1951 }
1952
1953 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1954                                     const struct nft_chain_hook *hook,
1955                                     struct nft_chain *chain)
1956 {
1957         ops->pf         = family;
1958         ops->hooknum    = hook->num;
1959         ops->priority   = hook->priority;
1960         ops->priv       = chain;
1961         ops->hook       = hook->type->hooks[ops->hooknum];
1962 }
1963
1964 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1965                               struct nft_chain_hook *hook, u32 flags)
1966 {
1967         struct nft_chain *chain;
1968         struct nft_hook *h;
1969
1970         basechain->type = hook->type;
1971         INIT_LIST_HEAD(&basechain->hook_list);
1972         chain = &basechain->chain;
1973
1974         if (nft_base_chain_netdev(family, hook->num)) {
1975                 list_splice_init(&hook->list, &basechain->hook_list);
1976                 list_for_each_entry(h, &basechain->hook_list, list)
1977                         nft_basechain_hook_init(&h->ops, family, hook, chain);
1978
1979                 basechain->ops.hooknum  = hook->num;
1980                 basechain->ops.priority = hook->priority;
1981         } else {
1982                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1983         }
1984
1985         chain->flags |= NFT_CHAIN_BASE | flags;
1986         basechain->policy = NF_ACCEPT;
1987         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1988             nft_chain_offload_priority(basechain) < 0)
1989                 return -EOPNOTSUPP;
1990
1991         flow_block_init(&basechain->flow_block);
1992
1993         return 0;
1994 }
1995
1996 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
1997 {
1998         int err;
1999
2000         err = rhltable_insert_key(&table->chains_ht, chain->name,
2001                                   &chain->rhlhead, nft_chain_ht_params);
2002         if (err)
2003                 return err;
2004
2005         list_add_tail_rcu(&chain->list, &table->chains);
2006
2007         return 0;
2008 }
2009
2010 static u64 chain_id;
2011
2012 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2013                               u8 policy, u32 flags)
2014 {
2015         const struct nlattr * const *nla = ctx->nla;
2016         struct nft_table *table = ctx->table;
2017         struct nft_base_chain *basechain;
2018         struct nft_stats __percpu *stats;
2019         struct net *net = ctx->net;
2020         char name[NFT_NAME_MAXLEN];
2021         struct nft_trans *trans;
2022         struct nft_chain *chain;
2023         struct nft_rule **rules;
2024         int err;
2025
2026         if (table->use == UINT_MAX)
2027                 return -EOVERFLOW;
2028
2029         if (nla[NFTA_CHAIN_HOOK]) {
2030                 struct nft_chain_hook hook;
2031
2032                 if (flags & NFT_CHAIN_BINDING)
2033                         return -EOPNOTSUPP;
2034
2035                 err = nft_chain_parse_hook(net, nla, &hook, family, true);
2036                 if (err < 0)
2037                         return err;
2038
2039                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2040                 if (basechain == NULL) {
2041                         nft_chain_release_hook(&hook);
2042                         return -ENOMEM;
2043                 }
2044                 chain = &basechain->chain;
2045
2046                 if (nla[NFTA_CHAIN_COUNTERS]) {
2047                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2048                         if (IS_ERR(stats)) {
2049                                 nft_chain_release_hook(&hook);
2050                                 kfree(basechain);
2051                                 return PTR_ERR(stats);
2052                         }
2053                         rcu_assign_pointer(basechain->stats, stats);
2054                         static_branch_inc(&nft_counters_enabled);
2055                 }
2056
2057                 err = nft_basechain_init(basechain, family, &hook, flags);
2058                 if (err < 0) {
2059                         nft_chain_release_hook(&hook);
2060                         kfree(basechain);
2061                         return err;
2062                 }
2063         } else {
2064                 if (flags & NFT_CHAIN_BASE)
2065                         return -EINVAL;
2066                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2067                         return -EOPNOTSUPP;
2068
2069                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2070                 if (chain == NULL)
2071                         return -ENOMEM;
2072
2073                 chain->flags = flags;
2074         }
2075         ctx->chain = chain;
2076
2077         INIT_LIST_HEAD(&chain->rules);
2078         chain->handle = nf_tables_alloc_handle(table);
2079         chain->table = table;
2080
2081         if (nla[NFTA_CHAIN_NAME]) {
2082                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2083         } else {
2084                 if (!(flags & NFT_CHAIN_BINDING)) {
2085                         err = -EINVAL;
2086                         goto err_destroy_chain;
2087                 }
2088
2089                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2090                 chain->name = kstrdup(name, GFP_KERNEL);
2091         }
2092
2093         if (!chain->name) {
2094                 err = -ENOMEM;
2095                 goto err_destroy_chain;
2096         }
2097
2098         if (nla[NFTA_CHAIN_USERDATA]) {
2099                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2100                 if (chain->udata == NULL) {
2101                         err = -ENOMEM;
2102                         goto err_destroy_chain;
2103                 }
2104                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2105         }
2106
2107         rules = nf_tables_chain_alloc_rules(chain, 0);
2108         if (!rules) {
2109                 err = -ENOMEM;
2110                 goto err_destroy_chain;
2111         }
2112
2113         *rules = NULL;
2114         rcu_assign_pointer(chain->rules_gen_0, rules);
2115         rcu_assign_pointer(chain->rules_gen_1, rules);
2116
2117         err = nf_tables_register_hook(net, table, chain);
2118         if (err < 0)
2119                 goto err_destroy_chain;
2120
2121         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2122         if (IS_ERR(trans)) {
2123                 err = PTR_ERR(trans);
2124                 goto err_unregister_hook;
2125         }
2126
2127         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2128         if (nft_is_base_chain(chain))
2129                 nft_trans_chain_policy(trans) = policy;
2130
2131         err = nft_chain_add(table, chain);
2132         if (err < 0) {
2133                 nft_trans_destroy(trans);
2134                 goto err_unregister_hook;
2135         }
2136
2137         table->use++;
2138
2139         return 0;
2140 err_unregister_hook:
2141         nf_tables_unregister_hook(net, table, chain);
2142 err_destroy_chain:
2143         nf_tables_chain_destroy(ctx);
2144
2145         return err;
2146 }
2147
2148 static bool nft_hook_list_equal(struct list_head *hook_list1,
2149                                 struct list_head *hook_list2)
2150 {
2151         struct nft_hook *hook;
2152         int n = 0, m = 0;
2153
2154         n = 0;
2155         list_for_each_entry(hook, hook_list2, list) {
2156                 if (!nft_hook_list_find(hook_list1, hook))
2157                         return false;
2158
2159                 n++;
2160         }
2161         list_for_each_entry(hook, hook_list1, list)
2162                 m++;
2163
2164         return n == m;
2165 }
2166
2167 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2168                               u32 flags, const struct nlattr *attr,
2169                               struct netlink_ext_ack *extack)
2170 {
2171         const struct nlattr * const *nla = ctx->nla;
2172         struct nft_table *table = ctx->table;
2173         struct nft_chain *chain = ctx->chain;
2174         struct nft_base_chain *basechain;
2175         struct nft_stats *stats = NULL;
2176         struct nft_chain_hook hook;
2177         struct nf_hook_ops *ops;
2178         struct nft_trans *trans;
2179         int err;
2180
2181         if (chain->flags ^ flags)
2182                 return -EOPNOTSUPP;
2183
2184         if (nla[NFTA_CHAIN_HOOK]) {
2185                 if (!nft_is_base_chain(chain)) {
2186                         NL_SET_BAD_ATTR(extack, attr);
2187                         return -EEXIST;
2188                 }
2189                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2190                                            false);
2191                 if (err < 0)
2192                         return err;
2193
2194                 basechain = nft_base_chain(chain);
2195                 if (basechain->type != hook.type) {
2196                         nft_chain_release_hook(&hook);
2197                         NL_SET_BAD_ATTR(extack, attr);
2198                         return -EEXIST;
2199                 }
2200
2201                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2202                         if (!nft_hook_list_equal(&basechain->hook_list,
2203                                                  &hook.list)) {
2204                                 nft_chain_release_hook(&hook);
2205                                 NL_SET_BAD_ATTR(extack, attr);
2206                                 return -EEXIST;
2207                         }
2208                 } else {
2209                         ops = &basechain->ops;
2210                         if (ops->hooknum != hook.num ||
2211                             ops->priority != hook.priority) {
2212                                 nft_chain_release_hook(&hook);
2213                                 NL_SET_BAD_ATTR(extack, attr);
2214                                 return -EEXIST;
2215                         }
2216                 }
2217                 nft_chain_release_hook(&hook);
2218         }
2219
2220         if (nla[NFTA_CHAIN_HANDLE] &&
2221             nla[NFTA_CHAIN_NAME]) {
2222                 struct nft_chain *chain2;
2223
2224                 chain2 = nft_chain_lookup(ctx->net, table,
2225                                           nla[NFTA_CHAIN_NAME], genmask);
2226                 if (!IS_ERR(chain2)) {
2227                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2228                         return -EEXIST;
2229                 }
2230         }
2231
2232         if (nla[NFTA_CHAIN_COUNTERS]) {
2233                 if (!nft_is_base_chain(chain))
2234                         return -EOPNOTSUPP;
2235
2236                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2237                 if (IS_ERR(stats))
2238                         return PTR_ERR(stats);
2239         }
2240
2241         err = -ENOMEM;
2242         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2243                                 sizeof(struct nft_trans_chain));
2244         if (trans == NULL)
2245                 goto err;
2246
2247         nft_trans_chain_stats(trans) = stats;
2248         nft_trans_chain_update(trans) = true;
2249
2250         if (nla[NFTA_CHAIN_POLICY])
2251                 nft_trans_chain_policy(trans) = policy;
2252         else
2253                 nft_trans_chain_policy(trans) = -1;
2254
2255         if (nla[NFTA_CHAIN_HANDLE] &&
2256             nla[NFTA_CHAIN_NAME]) {
2257                 struct nft_trans *tmp;
2258                 char *name;
2259
2260                 err = -ENOMEM;
2261                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2262                 if (!name)
2263                         goto err;
2264
2265                 err = -EEXIST;
2266                 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2267                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2268                             tmp->ctx.table == table &&
2269                             nft_trans_chain_update(tmp) &&
2270                             nft_trans_chain_name(tmp) &&
2271                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2272                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2273                                 kfree(name);
2274                                 goto err;
2275                         }
2276                 }
2277
2278                 nft_trans_chain_name(trans) = name;
2279         }
2280         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2281
2282         return 0;
2283 err:
2284         free_percpu(stats);
2285         kfree(trans);
2286         return err;
2287 }
2288
2289 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2290                                                const struct nlattr *nla)
2291 {
2292         u32 id = ntohl(nla_get_be32(nla));
2293         struct nft_trans *trans;
2294
2295         list_for_each_entry(trans, &net->nft.commit_list, list) {
2296                 struct nft_chain *chain = trans->ctx.chain;
2297
2298                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2299                     id == nft_trans_chain_id(trans))
2300                         return chain;
2301         }
2302         return ERR_PTR(-ENOENT);
2303 }
2304
2305 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2306                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2307                               const struct nlattr * const nla[],
2308                               struct netlink_ext_ack *extack)
2309 {
2310         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2311         u8 genmask = nft_genmask_next(net);
2312         int family = nfmsg->nfgen_family;
2313         struct nft_chain *chain = NULL;
2314         const struct nlattr *attr;
2315         struct nft_table *table;
2316         u8 policy = NF_ACCEPT;
2317         struct nft_ctx ctx;
2318         u64 handle = 0;
2319         u32 flags = 0;
2320
2321         lockdep_assert_held(&net->nft.commit_mutex);
2322
2323         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2324                                  NETLINK_CB(skb).portid);
2325         if (IS_ERR(table)) {
2326                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2327                 return PTR_ERR(table);
2328         }
2329
2330         chain = NULL;
2331         attr = nla[NFTA_CHAIN_NAME];
2332
2333         if (nla[NFTA_CHAIN_HANDLE]) {
2334                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2335                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2336                 if (IS_ERR(chain)) {
2337                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2338                         return PTR_ERR(chain);
2339                 }
2340                 attr = nla[NFTA_CHAIN_HANDLE];
2341         } else if (nla[NFTA_CHAIN_NAME]) {
2342                 chain = nft_chain_lookup(net, table, attr, genmask);
2343                 if (IS_ERR(chain)) {
2344                         if (PTR_ERR(chain) != -ENOENT) {
2345                                 NL_SET_BAD_ATTR(extack, attr);
2346                                 return PTR_ERR(chain);
2347                         }
2348                         chain = NULL;
2349                 }
2350         } else if (!nla[NFTA_CHAIN_ID]) {
2351                 return -EINVAL;
2352         }
2353
2354         if (nla[NFTA_CHAIN_POLICY]) {
2355                 if (chain != NULL &&
2356                     !nft_is_base_chain(chain)) {
2357                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2358                         return -EOPNOTSUPP;
2359                 }
2360
2361                 if (chain == NULL &&
2362                     nla[NFTA_CHAIN_HOOK] == NULL) {
2363                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2364                         return -EOPNOTSUPP;
2365                 }
2366
2367                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2368                 switch (policy) {
2369                 case NF_DROP:
2370                 case NF_ACCEPT:
2371                         break;
2372                 default:
2373                         return -EINVAL;
2374                 }
2375         }
2376
2377         if (nla[NFTA_CHAIN_FLAGS])
2378                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2379         else if (chain)
2380                 flags = chain->flags;
2381
2382         if (flags & ~NFT_CHAIN_FLAGS)
2383                 return -EOPNOTSUPP;
2384
2385         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2386
2387         if (chain != NULL) {
2388                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2389                         NL_SET_BAD_ATTR(extack, attr);
2390                         return -EEXIST;
2391                 }
2392                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2393                         return -EOPNOTSUPP;
2394
2395                 flags |= chain->flags & NFT_CHAIN_BASE;
2396                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2397                                           extack);
2398         }
2399
2400         return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2401 }
2402
2403 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2404                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2405                               const struct nlattr * const nla[],
2406                               struct netlink_ext_ack *extack)
2407 {
2408         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2409         u8 genmask = nft_genmask_next(net);
2410         int family = nfmsg->nfgen_family;
2411         const struct nlattr *attr;
2412         struct nft_table *table;
2413         struct nft_chain *chain;
2414         struct nft_rule *rule;
2415         struct nft_ctx ctx;
2416         u64 handle;
2417         u32 use;
2418         int err;
2419
2420         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2421                                  NETLINK_CB(skb).portid);
2422         if (IS_ERR(table)) {
2423                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2424                 return PTR_ERR(table);
2425         }
2426
2427         if (nla[NFTA_CHAIN_HANDLE]) {
2428                 attr = nla[NFTA_CHAIN_HANDLE];
2429                 handle = be64_to_cpu(nla_get_be64(attr));
2430                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2431         } else {
2432                 attr = nla[NFTA_CHAIN_NAME];
2433                 chain = nft_chain_lookup(net, table, attr, genmask);
2434         }
2435         if (IS_ERR(chain)) {
2436                 NL_SET_BAD_ATTR(extack, attr);
2437                 return PTR_ERR(chain);
2438         }
2439
2440         if (nlh->nlmsg_flags & NLM_F_NONREC &&
2441             chain->use > 0)
2442                 return -EBUSY;
2443
2444         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2445
2446         use = chain->use;
2447         list_for_each_entry(rule, &chain->rules, list) {
2448                 if (!nft_is_active_next(net, rule))
2449                         continue;
2450                 use--;
2451
2452                 err = nft_delrule(&ctx, rule);
2453                 if (err < 0)
2454                         return err;
2455         }
2456
2457         /* There are rules and elements that are still holding references to us,
2458          * we cannot do a recursive removal in this case.
2459          */
2460         if (use > 0) {
2461                 NL_SET_BAD_ATTR(extack, attr);
2462                 return -EBUSY;
2463         }
2464
2465         return nft_delchain(&ctx);
2466 }
2467
2468 /*
2469  * Expressions
2470  */
2471
2472 /**
2473  *      nft_register_expr - register nf_tables expr type
2474  *      @type: expr type
2475  *
2476  *      Registers the expr type for use with nf_tables. Returns zero on
2477  *      success or a negative errno code otherwise.
2478  */
2479 int nft_register_expr(struct nft_expr_type *type)
2480 {
2481         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2482         if (type->family == NFPROTO_UNSPEC)
2483                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2484         else
2485                 list_add_rcu(&type->list, &nf_tables_expressions);
2486         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2487         return 0;
2488 }
2489 EXPORT_SYMBOL_GPL(nft_register_expr);
2490
2491 /**
2492  *      nft_unregister_expr - unregister nf_tables expr type
2493  *      @type: expr type
2494  *
2495  *      Unregisters the expr typefor use with nf_tables.
2496  */
2497 void nft_unregister_expr(struct nft_expr_type *type)
2498 {
2499         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2500         list_del_rcu(&type->list);
2501         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2502 }
2503 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2504
2505 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2506                                                        struct nlattr *nla)
2507 {
2508         const struct nft_expr_type *type, *candidate = NULL;
2509
2510         list_for_each_entry(type, &nf_tables_expressions, list) {
2511                 if (!nla_strcmp(nla, type->name)) {
2512                         if (!type->family && !candidate)
2513                                 candidate = type;
2514                         else if (type->family == family)
2515                                 candidate = type;
2516                 }
2517         }
2518         return candidate;
2519 }
2520
2521 #ifdef CONFIG_MODULES
2522 static int nft_expr_type_request_module(struct net *net, u8 family,
2523                                         struct nlattr *nla)
2524 {
2525         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2526                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2527                 return -EAGAIN;
2528
2529         return 0;
2530 }
2531 #endif
2532
2533 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2534                                                      u8 family,
2535                                                      struct nlattr *nla)
2536 {
2537         const struct nft_expr_type *type;
2538
2539         if (nla == NULL)
2540                 return ERR_PTR(-EINVAL);
2541
2542         type = __nft_expr_type_get(family, nla);
2543         if (type != NULL && try_module_get(type->owner))
2544                 return type;
2545
2546         lockdep_nfnl_nft_mutex_not_held();
2547 #ifdef CONFIG_MODULES
2548         if (type == NULL) {
2549                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2550                         return ERR_PTR(-EAGAIN);
2551
2552                 if (nft_request_module(net, "nft-expr-%.*s",
2553                                        nla_len(nla),
2554                                        (char *)nla_data(nla)) == -EAGAIN)
2555                         return ERR_PTR(-EAGAIN);
2556         }
2557 #endif
2558         return ERR_PTR(-ENOENT);
2559 }
2560
2561 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2562         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2563                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2564         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2565 };
2566
2567 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2568                                     const struct nft_expr *expr)
2569 {
2570         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2571                 goto nla_put_failure;
2572
2573         if (expr->ops->dump) {
2574                 struct nlattr *data = nla_nest_start_noflag(skb,
2575                                                             NFTA_EXPR_DATA);
2576                 if (data == NULL)
2577                         goto nla_put_failure;
2578                 if (expr->ops->dump(skb, expr) < 0)
2579                         goto nla_put_failure;
2580                 nla_nest_end(skb, data);
2581         }
2582
2583         return skb->len;
2584
2585 nla_put_failure:
2586         return -1;
2587 };
2588
2589 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2590                   const struct nft_expr *expr)
2591 {
2592         struct nlattr *nest;
2593
2594         nest = nla_nest_start_noflag(skb, attr);
2595         if (!nest)
2596                 goto nla_put_failure;
2597         if (nf_tables_fill_expr_info(skb, expr) < 0)
2598                 goto nla_put_failure;
2599         nla_nest_end(skb, nest);
2600         return 0;
2601
2602 nla_put_failure:
2603         return -1;
2604 }
2605
2606 struct nft_expr_info {
2607         const struct nft_expr_ops       *ops;
2608         const struct nlattr             *attr;
2609         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2610 };
2611
2612 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2613                                 const struct nlattr *nla,
2614                                 struct nft_expr_info *info)
2615 {
2616         const struct nft_expr_type *type;
2617         const struct nft_expr_ops *ops;
2618         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2619         int err;
2620
2621         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2622                                           nft_expr_policy, NULL);
2623         if (err < 0)
2624                 return err;
2625
2626         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2627         if (IS_ERR(type))
2628                 return PTR_ERR(type);
2629
2630         if (tb[NFTA_EXPR_DATA]) {
2631                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2632                                                   tb[NFTA_EXPR_DATA],
2633                                                   type->policy, NULL);
2634                 if (err < 0)
2635                         goto err1;
2636         } else
2637                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2638
2639         if (type->select_ops != NULL) {
2640                 ops = type->select_ops(ctx,
2641                                        (const struct nlattr * const *)info->tb);
2642                 if (IS_ERR(ops)) {
2643                         err = PTR_ERR(ops);
2644 #ifdef CONFIG_MODULES
2645                         if (err == -EAGAIN)
2646                                 if (nft_expr_type_request_module(ctx->net,
2647                                                                  ctx->family,
2648                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2649                                         err = -ENOENT;
2650 #endif
2651                         goto err1;
2652                 }
2653         } else
2654                 ops = type->ops;
2655
2656         info->attr = nla;
2657         info->ops = ops;
2658
2659         return 0;
2660
2661 err1:
2662         module_put(type->owner);
2663         return err;
2664 }
2665
2666 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2667                              const struct nft_expr_info *info,
2668                              struct nft_expr *expr)
2669 {
2670         const struct nft_expr_ops *ops = info->ops;
2671         int err;
2672
2673         expr->ops = ops;
2674         if (ops->init) {
2675                 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2676                 if (err < 0)
2677                         goto err1;
2678         }
2679
2680         return 0;
2681 err1:
2682         expr->ops = NULL;
2683         return err;
2684 }
2685
2686 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2687                                    struct nft_expr *expr)
2688 {
2689         const struct nft_expr_type *type = expr->ops->type;
2690
2691         if (expr->ops->destroy)
2692                 expr->ops->destroy(ctx, expr);
2693         module_put(type->owner);
2694 }
2695
2696 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2697                                       const struct nlattr *nla)
2698 {
2699         struct nft_expr_info info;
2700         struct nft_expr *expr;
2701         struct module *owner;
2702         int err;
2703
2704         err = nf_tables_expr_parse(ctx, nla, &info);
2705         if (err < 0)
2706                 goto err1;
2707
2708         err = -ENOMEM;
2709         expr = kzalloc(info.ops->size, GFP_KERNEL);
2710         if (expr == NULL)
2711                 goto err2;
2712
2713         err = nf_tables_newexpr(ctx, &info, expr);
2714         if (err < 0)
2715                 goto err3;
2716
2717         return expr;
2718 err3:
2719         kfree(expr);
2720 err2:
2721         owner = info.ops->type->owner;
2722         if (info.ops->type->release_ops)
2723                 info.ops->type->release_ops(info.ops);
2724
2725         module_put(owner);
2726 err1:
2727         return ERR_PTR(err);
2728 }
2729
2730 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2731 {
2732         int err;
2733
2734         if (src->ops->clone) {
2735                 dst->ops = src->ops;
2736                 err = src->ops->clone(dst, src);
2737                 if (err < 0)
2738                         return err;
2739         } else {
2740                 memcpy(dst, src, src->ops->size);
2741         }
2742
2743         __module_get(src->ops->type->owner);
2744
2745         return 0;
2746 }
2747
2748 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2749 {
2750         nf_tables_expr_destroy(ctx, expr);
2751         kfree(expr);
2752 }
2753
2754 /*
2755  * Rules
2756  */
2757
2758 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2759                                           u64 handle)
2760 {
2761         struct nft_rule *rule;
2762
2763         // FIXME: this sucks
2764         list_for_each_entry_rcu(rule, &chain->rules, list) {
2765                 if (handle == rule->handle)
2766                         return rule;
2767         }
2768
2769         return ERR_PTR(-ENOENT);
2770 }
2771
2772 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2773                                         const struct nlattr *nla)
2774 {
2775         if (nla == NULL)
2776                 return ERR_PTR(-EINVAL);
2777
2778         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2779 }
2780
2781 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2782         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2783                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2784         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2785                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2786         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2787         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2788         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2789         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2790         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2791                                     .len = NFT_USERDATA_MAXLEN },
2792         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2793         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2794         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2795 };
2796
2797 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2798                                     u32 portid, u32 seq, int event,
2799                                     u32 flags, int family,
2800                                     const struct nft_table *table,
2801                                     const struct nft_chain *chain,
2802                                     const struct nft_rule *rule,
2803                                     const struct nft_rule *prule)
2804 {
2805         struct nlmsghdr *nlh;
2806         struct nfgenmsg *nfmsg;
2807         const struct nft_expr *expr, *next;
2808         struct nlattr *list;
2809         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2810
2811         nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2812         if (nlh == NULL)
2813                 goto nla_put_failure;
2814
2815         nfmsg = nlmsg_data(nlh);
2816         nfmsg->nfgen_family     = family;
2817         nfmsg->version          = NFNETLINK_V0;
2818         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
2819
2820         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2821                 goto nla_put_failure;
2822         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2823                 goto nla_put_failure;
2824         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2825                          NFTA_RULE_PAD))
2826                 goto nla_put_failure;
2827
2828         if (event != NFT_MSG_DELRULE && prule) {
2829                 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2830                                  cpu_to_be64(prule->handle),
2831                                  NFTA_RULE_PAD))
2832                         goto nla_put_failure;
2833         }
2834
2835         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2836         if (list == NULL)
2837                 goto nla_put_failure;
2838         nft_rule_for_each_expr(expr, next, rule) {
2839                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2840                         goto nla_put_failure;
2841         }
2842         nla_nest_end(skb, list);
2843
2844         if (rule->udata) {
2845                 struct nft_userdata *udata = nft_userdata(rule);
2846                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2847                             udata->data) < 0)
2848                         goto nla_put_failure;
2849         }
2850
2851         nlmsg_end(skb, nlh);
2852         return 0;
2853
2854 nla_put_failure:
2855         nlmsg_trim(skb, nlh);
2856         return -1;
2857 }
2858
2859 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2860                                   const struct nft_rule *rule, int event)
2861 {
2862         struct sk_buff *skb;
2863         int err;
2864         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
2865                               ctx->table->name, ctx->table->handle,
2866                               ctx->chain->name, ctx->chain->handle);
2867
2868         audit_log_nfcfg(buf,
2869                         ctx->family,
2870                         rule->handle,
2871                         event == NFT_MSG_NEWRULE ?
2872                                 AUDIT_NFT_OP_RULE_REGISTER :
2873                                 AUDIT_NFT_OP_RULE_UNREGISTER,
2874                         GFP_KERNEL);
2875         kfree(buf);
2876
2877         if (!ctx->report &&
2878             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2879                 return;
2880
2881         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2882         if (skb == NULL)
2883                 goto err;
2884
2885         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2886                                        event, 0, ctx->family, ctx->table,
2887                                        ctx->chain, rule, NULL);
2888         if (err < 0) {
2889                 kfree_skb(skb);
2890                 goto err;
2891         }
2892
2893         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
2894         return;
2895 err:
2896         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2897 }
2898
2899 struct nft_rule_dump_ctx {
2900         char *table;
2901         char *chain;
2902 };
2903
2904 static int __nf_tables_dump_rules(struct sk_buff *skb,
2905                                   unsigned int *idx,
2906                                   struct netlink_callback *cb,
2907                                   const struct nft_table *table,
2908                                   const struct nft_chain *chain)
2909 {
2910         struct net *net = sock_net(skb->sk);
2911         const struct nft_rule *rule, *prule;
2912         unsigned int s_idx = cb->args[0];
2913
2914         prule = NULL;
2915         list_for_each_entry_rcu(rule, &chain->rules, list) {
2916                 if (!nft_is_active(net, rule))
2917                         goto cont_skip;
2918                 if (*idx < s_idx)
2919                         goto cont;
2920                 if (*idx > s_idx) {
2921                         memset(&cb->args[1], 0,
2922                                         sizeof(cb->args) - sizeof(cb->args[0]));
2923                 }
2924                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2925                                         cb->nlh->nlmsg_seq,
2926                                         NFT_MSG_NEWRULE,
2927                                         NLM_F_MULTI | NLM_F_APPEND,
2928                                         table->family,
2929                                         table, chain, rule, prule) < 0)
2930                         return 1;
2931
2932                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2933 cont:
2934                 prule = rule;
2935 cont_skip:
2936                 (*idx)++;
2937         }
2938         return 0;
2939 }
2940
2941 static int nf_tables_dump_rules(struct sk_buff *skb,
2942                                 struct netlink_callback *cb)
2943 {
2944         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2945         const struct nft_rule_dump_ctx *ctx = cb->data;
2946         struct nft_table *table;
2947         const struct nft_chain *chain;
2948         unsigned int idx = 0;
2949         struct net *net = sock_net(skb->sk);
2950         int family = nfmsg->nfgen_family;
2951
2952         rcu_read_lock();
2953         cb->seq = net->nft.base_seq;
2954
2955         list_for_each_entry_rcu(table, &net->nft.tables, list) {
2956                 if (family != NFPROTO_UNSPEC && family != table->family)
2957                         continue;
2958
2959                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2960                         continue;
2961
2962                 if (ctx && ctx->table && ctx->chain) {
2963                         struct rhlist_head *list, *tmp;
2964
2965                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
2966                                                nft_chain_ht_params);
2967                         if (!list)
2968                                 goto done;
2969
2970                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2971                                 if (!nft_is_active(net, chain))
2972                                         continue;
2973                                 __nf_tables_dump_rules(skb, &idx,
2974                                                        cb, table, chain);
2975                                 break;
2976                         }
2977                         goto done;
2978                 }
2979
2980                 list_for_each_entry_rcu(chain, &table->chains, list) {
2981                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2982                                 goto done;
2983                 }
2984
2985                 if (ctx && ctx->table)
2986                         break;
2987         }
2988 done:
2989         rcu_read_unlock();
2990
2991         cb->args[0] = idx;
2992         return skb->len;
2993 }
2994
2995 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2996 {
2997         const struct nlattr * const *nla = cb->data;
2998         struct nft_rule_dump_ctx *ctx = NULL;
2999
3000         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3001                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3002                 if (!ctx)
3003                         return -ENOMEM;
3004
3005                 if (nla[NFTA_RULE_TABLE]) {
3006                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3007                                                         GFP_ATOMIC);
3008                         if (!ctx->table) {
3009                                 kfree(ctx);
3010                                 return -ENOMEM;
3011                         }
3012                 }
3013                 if (nla[NFTA_RULE_CHAIN]) {
3014                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3015                                                 GFP_ATOMIC);
3016                         if (!ctx->chain) {
3017                                 kfree(ctx->table);
3018                                 kfree(ctx);
3019                                 return -ENOMEM;
3020                         }
3021                 }
3022         }
3023
3024         cb->data = ctx;
3025         return 0;
3026 }
3027
3028 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3029 {
3030         struct nft_rule_dump_ctx *ctx = cb->data;
3031
3032         if (ctx) {
3033                 kfree(ctx->table);
3034                 kfree(ctx->chain);
3035                 kfree(ctx);
3036         }
3037         return 0;
3038 }
3039
3040 /* called with rcu_read_lock held */
3041 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
3042                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3043                              const struct nlattr * const nla[],
3044                              struct netlink_ext_ack *extack)
3045 {
3046         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3047         u8 genmask = nft_genmask_cur(net);
3048         const struct nft_chain *chain;
3049         const struct nft_rule *rule;
3050         struct nft_table *table;
3051         struct sk_buff *skb2;
3052         int family = nfmsg->nfgen_family;
3053         int err;
3054
3055         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3056                 struct netlink_dump_control c = {
3057                         .start= nf_tables_dump_rules_start,
3058                         .dump = nf_tables_dump_rules,
3059                         .done = nf_tables_dump_rules_done,
3060                         .module = THIS_MODULE,
3061                         .data = (void *)nla,
3062                 };
3063
3064                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3065         }
3066
3067         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3068         if (IS_ERR(table)) {
3069                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3070                 return PTR_ERR(table);
3071         }
3072
3073         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3074         if (IS_ERR(chain)) {
3075                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3076                 return PTR_ERR(chain);
3077         }
3078
3079         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3080         if (IS_ERR(rule)) {
3081                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3082                 return PTR_ERR(rule);
3083         }
3084
3085         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3086         if (!skb2)
3087                 return -ENOMEM;
3088
3089         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3090                                        nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3091                                        family, table, chain, rule, NULL);
3092         if (err < 0)
3093                 goto err_fill_rule_info;
3094
3095         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3096
3097 err_fill_rule_info:
3098         kfree_skb(skb2);
3099         return err;
3100 }
3101
3102 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3103                                    struct nft_rule *rule)
3104 {
3105         struct nft_expr *expr, *next;
3106
3107         /*
3108          * Careful: some expressions might not be initialized in case this
3109          * is called on error from nf_tables_newrule().
3110          */
3111         expr = nft_expr_first(rule);
3112         while (nft_expr_more(rule, expr)) {
3113                 next = nft_expr_next(expr);
3114                 nf_tables_expr_destroy(ctx, expr);
3115                 expr = next;
3116         }
3117         kfree(rule);
3118 }
3119
3120 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3121 {
3122         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3123         nf_tables_rule_destroy(ctx, rule);
3124 }
3125
3126 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3127 {
3128         struct nft_expr *expr, *last;
3129         const struct nft_data *data;
3130         struct nft_rule *rule;
3131         int err;
3132
3133         if (ctx->level == NFT_JUMP_STACK_SIZE)
3134                 return -EMLINK;
3135
3136         list_for_each_entry(rule, &chain->rules, list) {
3137                 if (!nft_is_active_next(ctx->net, rule))
3138                         continue;
3139
3140                 nft_rule_for_each_expr(expr, last, rule) {
3141                         if (!expr->ops->validate)
3142                                 continue;
3143
3144                         err = expr->ops->validate(ctx, expr, &data);
3145                         if (err < 0)
3146                                 return err;
3147                 }
3148         }
3149
3150         return 0;
3151 }
3152 EXPORT_SYMBOL_GPL(nft_chain_validate);
3153
3154 static int nft_table_validate(struct net *net, const struct nft_table *table)
3155 {
3156         struct nft_chain *chain;
3157         struct nft_ctx ctx = {
3158                 .net    = net,
3159                 .family = table->family,
3160         };
3161         int err;
3162
3163         list_for_each_entry(chain, &table->chains, list) {
3164                 if (!nft_is_base_chain(chain))
3165                         continue;
3166
3167                 ctx.chain = chain;
3168                 err = nft_chain_validate(&ctx, chain);
3169                 if (err < 0)
3170                         return err;
3171         }
3172
3173         return 0;
3174 }
3175
3176 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3177                                              const struct nlattr *nla);
3178
3179 #define NFT_RULE_MAXEXPRS       128
3180
3181 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3182                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3183                              const struct nlattr * const nla[],
3184                              struct netlink_ext_ack *extack)
3185 {
3186         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3187         u8 genmask = nft_genmask_next(net);
3188         struct nft_expr_info *info = NULL;
3189         int family = nfmsg->nfgen_family;
3190         struct nft_flow_rule *flow;
3191         struct nft_table *table;
3192         struct nft_chain *chain;
3193         struct nft_rule *rule, *old_rule = NULL;
3194         struct nft_userdata *udata;
3195         struct nft_trans *trans = NULL;
3196         struct nft_expr *expr;
3197         struct nft_ctx ctx;
3198         struct nlattr *tmp;
3199         unsigned int size, i, n, ulen = 0, usize = 0;
3200         int err, rem;
3201         u64 handle, pos_handle;
3202
3203         lockdep_assert_held(&net->nft.commit_mutex);
3204
3205         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3206                                  NETLINK_CB(skb).portid);
3207         if (IS_ERR(table)) {
3208                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3209                 return PTR_ERR(table);
3210         }
3211
3212         if (nla[NFTA_RULE_CHAIN]) {
3213                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3214                                          genmask);
3215                 if (IS_ERR(chain)) {
3216                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3217                         return PTR_ERR(chain);
3218                 }
3219                 if (nft_chain_is_bound(chain))
3220                         return -EOPNOTSUPP;
3221
3222         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3223                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3224                 if (IS_ERR(chain)) {
3225                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3226                         return PTR_ERR(chain);
3227                 }
3228         } else {
3229                 return -EINVAL;
3230         }
3231
3232         if (nla[NFTA_RULE_HANDLE]) {
3233                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3234                 rule = __nft_rule_lookup(chain, handle);
3235                 if (IS_ERR(rule)) {
3236                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3237                         return PTR_ERR(rule);
3238                 }
3239
3240                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3241                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3242                         return -EEXIST;
3243                 }
3244                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3245                         old_rule = rule;
3246                 else
3247                         return -EOPNOTSUPP;
3248         } else {
3249                 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3250                     nlh->nlmsg_flags & NLM_F_REPLACE)
3251                         return -EINVAL;
3252                 handle = nf_tables_alloc_handle(table);
3253
3254                 if (chain->use == UINT_MAX)
3255                         return -EOVERFLOW;
3256
3257                 if (nla[NFTA_RULE_POSITION]) {
3258                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3259                         old_rule = __nft_rule_lookup(chain, pos_handle);
3260                         if (IS_ERR(old_rule)) {
3261                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3262                                 return PTR_ERR(old_rule);
3263                         }
3264                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3265                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3266                         if (IS_ERR(old_rule)) {
3267                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3268                                 return PTR_ERR(old_rule);
3269                         }
3270                 }
3271         }
3272
3273         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3274
3275         n = 0;
3276         size = 0;
3277         if (nla[NFTA_RULE_EXPRESSIONS]) {
3278                 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3279                                       sizeof(struct nft_expr_info),
3280                                       GFP_KERNEL);
3281                 if (!info)
3282                         return -ENOMEM;
3283
3284                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3285                         err = -EINVAL;
3286                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3287                                 goto err1;
3288                         if (n == NFT_RULE_MAXEXPRS)
3289                                 goto err1;
3290                         err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3291                         if (err < 0)
3292                                 goto err1;
3293                         size += info[n].ops->size;
3294                         n++;
3295                 }
3296         }
3297         /* Check for overflow of dlen field */
3298         err = -EFBIG;
3299         if (size >= 1 << 12)
3300                 goto err1;
3301
3302         if (nla[NFTA_RULE_USERDATA]) {
3303                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3304                 if (ulen > 0)
3305                         usize = sizeof(struct nft_userdata) + ulen;
3306         }
3307
3308         err = -ENOMEM;
3309         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3310         if (rule == NULL)
3311                 goto err1;
3312
3313         nft_activate_next(net, rule);
3314
3315         rule->handle = handle;
3316         rule->dlen   = size;
3317         rule->udata  = ulen ? 1 : 0;
3318
3319         if (ulen) {
3320                 udata = nft_userdata(rule);
3321                 udata->len = ulen - 1;
3322                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3323         }
3324
3325         expr = nft_expr_first(rule);
3326         for (i = 0; i < n; i++) {
3327                 err = nf_tables_newexpr(&ctx, &info[i], expr);
3328                 if (err < 0) {
3329                         NL_SET_BAD_ATTR(extack, info[i].attr);
3330                         goto err2;
3331                 }
3332
3333                 if (info[i].ops->validate)
3334                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3335
3336                 info[i].ops = NULL;
3337                 expr = nft_expr_next(expr);
3338         }
3339
3340         if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3341                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3342                 if (trans == NULL) {
3343                         err = -ENOMEM;
3344                         goto err2;
3345                 }
3346                 err = nft_delrule(&ctx, old_rule);
3347                 if (err < 0) {
3348                         nft_trans_destroy(trans);
3349                         goto err2;
3350                 }
3351
3352                 list_add_tail_rcu(&rule->list, &old_rule->list);
3353         } else {
3354                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3355                 if (!trans) {
3356                         err = -ENOMEM;
3357                         goto err2;
3358                 }
3359
3360                 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3361                         if (old_rule)
3362                                 list_add_rcu(&rule->list, &old_rule->list);
3363                         else
3364                                 list_add_tail_rcu(&rule->list, &chain->rules);
3365                  } else {
3366                         if (old_rule)
3367                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3368                         else
3369                                 list_add_rcu(&rule->list, &chain->rules);
3370                 }
3371         }
3372         kvfree(info);
3373         chain->use++;
3374
3375         if (net->nft.validate_state == NFT_VALIDATE_DO)
3376                 return nft_table_validate(net, table);
3377
3378         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3379                 flow = nft_flow_rule_create(net, rule);
3380                 if (IS_ERR(flow))
3381                         return PTR_ERR(flow);
3382
3383                 nft_trans_flow_rule(trans) = flow;
3384         }
3385
3386         return 0;
3387 err2:
3388         nf_tables_rule_release(&ctx, rule);
3389 err1:
3390         for (i = 0; i < n; i++) {
3391                 if (info[i].ops) {
3392                         module_put(info[i].ops->type->owner);
3393                         if (info[i].ops->type->release_ops)
3394                                 info[i].ops->type->release_ops(info[i].ops);
3395                 }
3396         }
3397         kvfree(info);
3398         return err;
3399 }
3400
3401 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3402                                              const struct nlattr *nla)
3403 {
3404         u32 id = ntohl(nla_get_be32(nla));
3405         struct nft_trans *trans;
3406
3407         list_for_each_entry(trans, &net->nft.commit_list, list) {
3408                 struct nft_rule *rule = nft_trans_rule(trans);
3409
3410                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3411                     id == nft_trans_rule_id(trans))
3412                         return rule;
3413         }
3414         return ERR_PTR(-ENOENT);
3415 }
3416
3417 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3418                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3419                              const struct nlattr * const nla[],
3420                              struct netlink_ext_ack *extack)
3421 {
3422         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3423         u8 genmask = nft_genmask_next(net);
3424         struct nft_table *table;
3425         struct nft_chain *chain = NULL;
3426         struct nft_rule *rule;
3427         int family = nfmsg->nfgen_family, err = 0;
3428         struct nft_ctx ctx;
3429
3430         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3431                                  NETLINK_CB(skb).portid);
3432         if (IS_ERR(table)) {
3433                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3434                 return PTR_ERR(table);
3435         }
3436
3437         if (nla[NFTA_RULE_CHAIN]) {
3438                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3439                                          genmask);
3440                 if (IS_ERR(chain)) {
3441                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3442                         return PTR_ERR(chain);
3443                 }
3444                 if (nft_chain_is_bound(chain))
3445                         return -EOPNOTSUPP;
3446         }
3447
3448         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3449
3450         if (chain) {
3451                 if (nla[NFTA_RULE_HANDLE]) {
3452                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3453                         if (IS_ERR(rule)) {
3454                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3455                                 return PTR_ERR(rule);
3456                         }
3457
3458                         err = nft_delrule(&ctx, rule);
3459                 } else if (nla[NFTA_RULE_ID]) {
3460                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3461                         if (IS_ERR(rule)) {
3462                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3463                                 return PTR_ERR(rule);
3464                         }
3465
3466                         err = nft_delrule(&ctx, rule);
3467                 } else {
3468                         err = nft_delrule_by_chain(&ctx);
3469                 }
3470         } else {
3471                 list_for_each_entry(chain, &table->chains, list) {
3472                         if (!nft_is_active_next(net, chain))
3473                                 continue;
3474
3475                         ctx.chain = chain;
3476                         err = nft_delrule_by_chain(&ctx);
3477                         if (err < 0)
3478                                 break;
3479                 }
3480         }
3481
3482         return err;
3483 }
3484
3485 /*
3486  * Sets
3487  */
3488 static const struct nft_set_type *nft_set_types[] = {
3489         &nft_set_hash_fast_type,
3490         &nft_set_hash_type,
3491         &nft_set_rhash_type,
3492         &nft_set_bitmap_type,
3493         &nft_set_rbtree_type,
3494 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3495         &nft_set_pipapo_avx2_type,
3496 #endif
3497         &nft_set_pipapo_type,
3498 };
3499
3500 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3501                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3502                                  NFT_SET_EVAL)
3503
3504 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3505 {
3506         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3507 }
3508
3509 /*
3510  * Select a set implementation based on the data characteristics and the
3511  * given policy. The total memory use might not be known if no size is
3512  * given, in that case the amount of memory per element is used.
3513  */
3514 static const struct nft_set_ops *
3515 nft_select_set_ops(const struct nft_ctx *ctx,
3516                    const struct nlattr * const nla[],
3517                    const struct nft_set_desc *desc,
3518                    enum nft_set_policies policy)
3519 {
3520         const struct nft_set_ops *ops, *bops;
3521         struct nft_set_estimate est, best;
3522         const struct nft_set_type *type;
3523         u32 flags = 0;
3524         int i;
3525
3526         lockdep_assert_held(&ctx->net->nft.commit_mutex);
3527         lockdep_nfnl_nft_mutex_not_held();
3528
3529         if (nla[NFTA_SET_FLAGS] != NULL)
3530                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3531
3532         bops        = NULL;
3533         best.size   = ~0;
3534         best.lookup = ~0;
3535         best.space  = ~0;
3536
3537         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3538                 type = nft_set_types[i];
3539                 ops = &type->ops;
3540
3541                 if (!nft_set_ops_candidate(type, flags))
3542                         continue;
3543                 if (!ops->estimate(desc, flags, &est))
3544                         continue;
3545
3546                 switch (policy) {
3547                 case NFT_SET_POL_PERFORMANCE:
3548                         if (est.lookup < best.lookup)
3549                                 break;
3550                         if (est.lookup == best.lookup &&
3551                             est.space < best.space)
3552                                 break;
3553                         continue;
3554                 case NFT_SET_POL_MEMORY:
3555                         if (!desc->size) {
3556                                 if (est.space < best.space)
3557                                         break;
3558                                 if (est.space == best.space &&
3559                                     est.lookup < best.lookup)
3560                                         break;
3561                         } else if (est.size < best.size || !bops) {
3562                                 break;
3563                         }
3564                         continue;
3565                 default:
3566                         break;
3567                 }
3568
3569                 bops = ops;
3570                 best = est;
3571         }
3572
3573         if (bops != NULL)
3574                 return bops;
3575
3576         return ERR_PTR(-EOPNOTSUPP);
3577 }
3578
3579 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3580         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3581                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3582         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3583                                             .len = NFT_SET_MAXNAMELEN - 1 },
3584         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3585         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3586         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3587         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3588         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3589         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3590         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3591         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3592         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3593         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3594         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3595                                             .len  = NFT_USERDATA_MAXLEN },
3596         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3597         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3598         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3599         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3600 };
3601
3602 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3603         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3604         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3605 };
3606
3607 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3608                                      const struct sk_buff *skb,
3609                                      const struct nlmsghdr *nlh,
3610                                      const struct nlattr * const nla[],
3611                                      struct netlink_ext_ack *extack,
3612                                      u8 genmask, u32 nlpid)
3613 {
3614         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3615         int family = nfmsg->nfgen_family;
3616         struct nft_table *table = NULL;
3617
3618         if (nla[NFTA_SET_TABLE] != NULL) {
3619                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3620                                          genmask, nlpid);
3621                 if (IS_ERR(table)) {
3622                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3623                         return PTR_ERR(table);
3624                 }
3625         }
3626
3627         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3628         return 0;
3629 }
3630
3631 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3632                                       const struct nlattr *nla, u8 genmask)
3633 {
3634         struct nft_set *set;
3635
3636         if (nla == NULL)
3637                 return ERR_PTR(-EINVAL);
3638
3639         list_for_each_entry_rcu(set, &table->sets, list) {
3640                 if (!nla_strcmp(nla, set->name) &&
3641                     nft_active_genmask(set, genmask))
3642                         return set;
3643         }
3644         return ERR_PTR(-ENOENT);
3645 }
3646
3647 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3648                                                const struct nlattr *nla,
3649                                                u8 genmask)
3650 {
3651         struct nft_set *set;
3652
3653         list_for_each_entry(set, &table->sets, list) {
3654                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3655                     nft_active_genmask(set, genmask))
3656                         return set;
3657         }
3658         return ERR_PTR(-ENOENT);
3659 }
3660
3661 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3662                                            const struct nlattr *nla, u8 genmask)
3663 {
3664         struct nft_trans *trans;
3665         u32 id = ntohl(nla_get_be32(nla));
3666
3667         list_for_each_entry(trans, &net->nft.commit_list, list) {
3668                 if (trans->msg_type == NFT_MSG_NEWSET) {
3669                         struct nft_set *set = nft_trans_set(trans);
3670
3671                         if (id == nft_trans_set_id(trans) &&
3672                             nft_active_genmask(set, genmask))
3673                                 return set;
3674                 }
3675         }
3676         return ERR_PTR(-ENOENT);
3677 }
3678
3679 struct nft_set *nft_set_lookup_global(const struct net *net,
3680                                       const struct nft_table *table,
3681                                       const struct nlattr *nla_set_name,
3682                                       const struct nlattr *nla_set_id,
3683                                       u8 genmask)
3684 {
3685         struct nft_set *set;
3686
3687         set = nft_set_lookup(table, nla_set_name, genmask);
3688         if (IS_ERR(set)) {
3689                 if (!nla_set_id)
3690                         return set;
3691
3692                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3693         }
3694         return set;
3695 }
3696 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3697
3698 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3699                                     const char *name)
3700 {
3701         const struct nft_set *i;
3702         const char *p;
3703         unsigned long *inuse;
3704         unsigned int n = 0, min = 0;
3705
3706         p = strchr(name, '%');
3707         if (p != NULL) {
3708                 if (p[1] != 'd' || strchr(p + 2, '%'))
3709                         return -EINVAL;
3710
3711                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3712                 if (inuse == NULL)
3713                         return -ENOMEM;
3714 cont:
3715                 list_for_each_entry(i, &ctx->table->sets, list) {
3716                         int tmp;
3717
3718                         if (!nft_is_active_next(ctx->net, set))
3719                                 continue;
3720                         if (!sscanf(i->name, name, &tmp))
3721                                 continue;
3722                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3723                                 continue;
3724
3725                         set_bit(tmp - min, inuse);
3726                 }
3727
3728                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3729                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3730                         min += BITS_PER_BYTE * PAGE_SIZE;
3731                         memset(inuse, 0, PAGE_SIZE);
3732                         goto cont;
3733                 }
3734                 free_page((unsigned long)inuse);
3735         }
3736
3737         set->name = kasprintf(GFP_KERNEL, name, min + n);
3738         if (!set->name)
3739                 return -ENOMEM;
3740
3741         list_for_each_entry(i, &ctx->table->sets, list) {
3742                 if (!nft_is_active_next(ctx->net, i))
3743                         continue;
3744                 if (!strcmp(set->name, i->name)) {
3745                         kfree(set->name);
3746                         set->name = NULL;
3747                         return -ENFILE;
3748                 }
3749         }
3750         return 0;
3751 }
3752
3753 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3754 {
3755         u64 ms = be64_to_cpu(nla_get_be64(nla));
3756         u64 max = (u64)(~((u64)0));
3757
3758         max = div_u64(max, NSEC_PER_MSEC);
3759         if (ms >= max)
3760                 return -ERANGE;
3761
3762         ms *= NSEC_PER_MSEC;
3763         *result = nsecs_to_jiffies64(ms);
3764         return 0;
3765 }
3766
3767 __be64 nf_jiffies64_to_msecs(u64 input)
3768 {
3769         return cpu_to_be64(jiffies64_to_msecs(input));
3770 }
3771
3772 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3773                                      const struct nft_set *set)
3774 {
3775         struct nlattr *concat, *field;
3776         int i;
3777
3778         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3779         if (!concat)
3780                 return -ENOMEM;
3781
3782         for (i = 0; i < set->field_count; i++) {
3783                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3784                 if (!field)
3785                         return -ENOMEM;
3786
3787                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3788                                  htonl(set->field_len[i])))
3789                         return -ENOMEM;
3790
3791                 nla_nest_end(skb, field);
3792         }
3793
3794         nla_nest_end(skb, concat);
3795
3796         return 0;
3797 }
3798
3799 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3800                               const struct nft_set *set, u16 event, u16 flags)
3801 {
3802         struct nfgenmsg *nfmsg;
3803         struct nlmsghdr *nlh;
3804         u32 portid = ctx->portid;
3805         struct nlattr *nest;
3806         u32 seq = ctx->seq;
3807         int i;
3808
3809         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3810         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3811                         flags);
3812         if (nlh == NULL)
3813                 goto nla_put_failure;
3814
3815         nfmsg = nlmsg_data(nlh);
3816         nfmsg->nfgen_family     = ctx->family;
3817         nfmsg->version          = NFNETLINK_V0;
3818         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
3819
3820         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3821                 goto nla_put_failure;
3822         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3823                 goto nla_put_failure;
3824         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3825                          NFTA_SET_PAD))
3826                 goto nla_put_failure;
3827         if (set->flags != 0)
3828                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3829                         goto nla_put_failure;
3830
3831         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3832                 goto nla_put_failure;
3833         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3834                 goto nla_put_failure;
3835         if (set->flags & NFT_SET_MAP) {
3836                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3837                         goto nla_put_failure;
3838                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3839                         goto nla_put_failure;
3840         }
3841         if (set->flags & NFT_SET_OBJECT &&
3842             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3843                 goto nla_put_failure;
3844
3845         if (set->timeout &&
3846             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3847                          nf_jiffies64_to_msecs(set->timeout),
3848                          NFTA_SET_PAD))
3849                 goto nla_put_failure;
3850         if (set->gc_int &&
3851             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3852                 goto nla_put_failure;
3853
3854         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3855                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3856                         goto nla_put_failure;
3857         }
3858
3859         if (set->udata &&
3860             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3861                 goto nla_put_failure;
3862
3863         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3864         if (!nest)
3865                 goto nla_put_failure;
3866         if (set->size &&
3867             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3868                 goto nla_put_failure;
3869
3870         if (set->field_count > 1 &&
3871             nf_tables_fill_set_concat(skb, set))
3872                 goto nla_put_failure;
3873
3874         nla_nest_end(skb, nest);
3875
3876         if (set->num_exprs == 1) {
3877                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3878                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3879                         goto nla_put_failure;
3880
3881                 nla_nest_end(skb, nest);
3882         } else if (set->num_exprs > 1) {
3883                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3884                 if (nest == NULL)
3885                         goto nla_put_failure;
3886
3887                 for (i = 0; i < set->num_exprs; i++) {
3888                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3889                                           set->exprs[i]) < 0)
3890                                 goto nla_put_failure;
3891                 }
3892                 nla_nest_end(skb, nest);
3893         }
3894
3895         nlmsg_end(skb, nlh);
3896         return 0;
3897
3898 nla_put_failure:
3899         nlmsg_trim(skb, nlh);
3900         return -1;
3901 }
3902
3903 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3904                                  const struct nft_set *set, int event,
3905                                  gfp_t gfp_flags)
3906 {
3907         struct sk_buff *skb;
3908         u32 portid = ctx->portid;
3909         int err;
3910         char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
3911                               ctx->table->name, ctx->table->handle,
3912                               set->name, set->handle);
3913
3914         audit_log_nfcfg(buf,
3915                         ctx->family,
3916                         set->field_count,
3917                         event == NFT_MSG_NEWSET ?
3918                                 AUDIT_NFT_OP_SET_REGISTER :
3919                                 AUDIT_NFT_OP_SET_UNREGISTER,
3920                         gfp_flags);
3921         kfree(buf);
3922
3923         if (!ctx->report &&
3924             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3925                 return;
3926
3927         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3928         if (skb == NULL)
3929                 goto err;
3930
3931         err = nf_tables_fill_set(skb, ctx, set, event, 0);
3932         if (err < 0) {
3933                 kfree_skb(skb);
3934                 goto err;
3935         }
3936
3937         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
3938         return;
3939 err:
3940         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3941 }
3942
3943 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3944 {
3945         const struct nft_set *set;
3946         unsigned int idx, s_idx = cb->args[0];
3947         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3948         struct net *net = sock_net(skb->sk);
3949         struct nft_ctx *ctx = cb->data, ctx_set;
3950
3951         if (cb->args[1])
3952                 return skb->len;
3953
3954         rcu_read_lock();
3955         cb->seq = net->nft.base_seq;
3956
3957         list_for_each_entry_rcu(table, &net->nft.tables, list) {
3958                 if (ctx->family != NFPROTO_UNSPEC &&
3959                     ctx->family != table->family)
3960                         continue;
3961
3962                 if (ctx->table && ctx->table != table)
3963                         continue;
3964
3965                 if (cur_table) {
3966                         if (cur_table != table)
3967                                 continue;
3968
3969                         cur_table = NULL;
3970                 }
3971                 idx = 0;
3972                 list_for_each_entry_rcu(set, &table->sets, list) {
3973                         if (idx < s_idx)
3974                                 goto cont;
3975                         if (!nft_is_active(net, set))
3976                                 goto cont;
3977
3978                         ctx_set = *ctx;
3979                         ctx_set.table = table;
3980                         ctx_set.family = table->family;
3981
3982                         if (nf_tables_fill_set(skb, &ctx_set, set,
3983                                                NFT_MSG_NEWSET,
3984                                                NLM_F_MULTI) < 0) {
3985                                 cb->args[0] = idx;
3986                                 cb->args[2] = (unsigned long) table;
3987                                 goto done;
3988                         }
3989                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3990 cont:
3991                         idx++;
3992                 }
3993                 if (s_idx)
3994                         s_idx = 0;
3995         }
3996         cb->args[1] = 1;
3997 done:
3998         rcu_read_unlock();
3999         return skb->len;
4000 }
4001
4002 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4003 {
4004         struct nft_ctx *ctx_dump = NULL;
4005
4006         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4007         if (ctx_dump == NULL)
4008                 return -ENOMEM;
4009
4010         cb->data = ctx_dump;
4011         return 0;
4012 }
4013
4014 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4015 {
4016         kfree(cb->data);
4017         return 0;
4018 }
4019
4020 /* called with rcu_read_lock held */
4021 static int nf_tables_getset(struct net *net, struct sock *nlsk,
4022                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4023                             const struct nlattr * const nla[],
4024                             struct netlink_ext_ack *extack)
4025 {
4026         u8 genmask = nft_genmask_cur(net);
4027         const struct nft_set *set;
4028         struct nft_ctx ctx;
4029         struct sk_buff *skb2;
4030         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4031         int err;
4032
4033         /* Verify existence before starting dump */
4034         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4035                                         genmask, 0);
4036         if (err < 0)
4037                 return err;
4038
4039         if (nlh->nlmsg_flags & NLM_F_DUMP) {
4040                 struct netlink_dump_control c = {
4041                         .start = nf_tables_dump_sets_start,
4042                         .dump = nf_tables_dump_sets,
4043                         .done = nf_tables_dump_sets_done,
4044                         .data = &ctx,
4045                         .module = THIS_MODULE,
4046                 };
4047
4048                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4049         }
4050
4051         /* Only accept unspec with dump */
4052         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4053                 return -EAFNOSUPPORT;
4054         if (!nla[NFTA_SET_TABLE])
4055                 return -EINVAL;
4056
4057         set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
4058         if (IS_ERR(set))
4059                 return PTR_ERR(set);
4060
4061         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4062         if (skb2 == NULL)
4063                 return -ENOMEM;
4064
4065         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4066         if (err < 0)
4067                 goto err_fill_set_info;
4068
4069         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4070
4071 err_fill_set_info:
4072         kfree_skb(skb2);
4073         return err;
4074 }
4075
4076 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4077         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4078 };
4079
4080 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4081                                      struct nft_set_desc *desc)
4082 {
4083         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4084         u32 len;
4085         int err;
4086
4087         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4088                                           nft_concat_policy, NULL);
4089         if (err < 0)
4090                 return err;
4091
4092         if (!tb[NFTA_SET_FIELD_LEN])
4093                 return -EINVAL;
4094
4095         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4096
4097         if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4098                 return -E2BIG;
4099
4100         desc->field_len[desc->field_count++] = len;
4101
4102         return 0;
4103 }
4104
4105 static int nft_set_desc_concat(struct nft_set_desc *desc,
4106                                const struct nlattr *nla)
4107 {
4108         struct nlattr *attr;
4109         int rem, err;
4110
4111         nla_for_each_nested(attr, nla, rem) {
4112                 if (nla_type(attr) != NFTA_LIST_ELEM)
4113                         return -EINVAL;
4114
4115                 err = nft_set_desc_concat_parse(attr, desc);
4116                 if (err < 0)
4117                         return err;
4118         }
4119
4120         return 0;
4121 }
4122
4123 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4124                                     const struct nlattr *nla)
4125 {
4126         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4127         int err;
4128
4129         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4130                                           nft_set_desc_policy, NULL);
4131         if (err < 0)
4132                 return err;
4133
4134         if (da[NFTA_SET_DESC_SIZE] != NULL)
4135                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4136         if (da[NFTA_SET_DESC_CONCAT])
4137                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4138
4139         return err;
4140 }
4141
4142 static int nf_tables_newset(struct net *net, struct sock *nlsk,
4143                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4144                             const struct nlattr * const nla[],
4145                             struct netlink_ext_ack *extack)
4146 {
4147         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4148         u8 genmask = nft_genmask_next(net);
4149         int family = nfmsg->nfgen_family;
4150         const struct nft_set_ops *ops;
4151         struct nft_expr *expr = NULL;
4152         struct nft_table *table;
4153         struct nft_set *set;
4154         struct nft_ctx ctx;
4155         char *name;
4156         u64 size;
4157         u64 timeout;
4158         u32 ktype, dtype, flags, policy, gc_int, objtype;
4159         struct nft_set_desc desc;
4160         unsigned char *udata;
4161         u16 udlen;
4162         int err;
4163         int i;
4164
4165         if (nla[NFTA_SET_TABLE] == NULL ||
4166             nla[NFTA_SET_NAME] == NULL ||
4167             nla[NFTA_SET_KEY_LEN] == NULL ||
4168             nla[NFTA_SET_ID] == NULL)
4169                 return -EINVAL;
4170
4171         memset(&desc, 0, sizeof(desc));
4172
4173         ktype = NFT_DATA_VALUE;
4174         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4175                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4176                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4177                         return -EINVAL;
4178         }
4179
4180         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4181         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4182                 return -EINVAL;
4183
4184         flags = 0;
4185         if (nla[NFTA_SET_FLAGS] != NULL) {
4186                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4187                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4188                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4189                               NFT_SET_MAP | NFT_SET_EVAL |
4190                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4191                         return -EOPNOTSUPP;
4192                 /* Only one of these operations is supported */
4193                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4194                              (NFT_SET_MAP | NFT_SET_OBJECT))
4195                         return -EOPNOTSUPP;
4196                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4197                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4198                         return -EOPNOTSUPP;
4199         }
4200
4201         dtype = 0;
4202         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4203                 if (!(flags & NFT_SET_MAP))
4204                         return -EINVAL;
4205
4206                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4207                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4208                     dtype != NFT_DATA_VERDICT)
4209                         return -EINVAL;
4210
4211                 if (dtype != NFT_DATA_VERDICT) {
4212                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4213                                 return -EINVAL;
4214                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4215                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4216                                 return -EINVAL;
4217                 } else
4218                         desc.dlen = sizeof(struct nft_verdict);
4219         } else if (flags & NFT_SET_MAP)
4220                 return -EINVAL;
4221
4222         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4223                 if (!(flags & NFT_SET_OBJECT))
4224                         return -EINVAL;
4225
4226                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4227                 if (objtype == NFT_OBJECT_UNSPEC ||
4228                     objtype > NFT_OBJECT_MAX)
4229                         return -EOPNOTSUPP;
4230         } else if (flags & NFT_SET_OBJECT)
4231                 return -EINVAL;
4232         else
4233                 objtype = NFT_OBJECT_UNSPEC;
4234
4235         timeout = 0;
4236         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4237                 if (!(flags & NFT_SET_TIMEOUT))
4238                         return -EINVAL;
4239
4240                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4241                 if (err)
4242                         return err;
4243         }
4244         gc_int = 0;
4245         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4246                 if (!(flags & NFT_SET_TIMEOUT))
4247                         return -EINVAL;
4248                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4249         }
4250
4251         policy = NFT_SET_POL_PERFORMANCE;
4252         if (nla[NFTA_SET_POLICY] != NULL)
4253                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4254
4255         if (nla[NFTA_SET_DESC] != NULL) {
4256                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4257                 if (err < 0)
4258                         return err;
4259         }
4260
4261         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4262                 desc.expr = true;
4263
4264         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4265                                  NETLINK_CB(skb).portid);
4266         if (IS_ERR(table)) {
4267                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4268                 return PTR_ERR(table);
4269         }
4270
4271         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4272
4273         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4274         if (IS_ERR(set)) {
4275                 if (PTR_ERR(set) != -ENOENT) {
4276                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4277                         return PTR_ERR(set);
4278                 }
4279         } else {
4280                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4281                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4282                         return -EEXIST;
4283                 }
4284                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4285                         return -EOPNOTSUPP;
4286
4287                 return 0;
4288         }
4289
4290         if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4291                 return -ENOENT;
4292
4293         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4294         if (IS_ERR(ops))
4295                 return PTR_ERR(ops);
4296
4297         udlen = 0;
4298         if (nla[NFTA_SET_USERDATA])
4299                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4300
4301         size = 0;
4302         if (ops->privsize != NULL)
4303                 size = ops->privsize(nla, &desc);
4304
4305         set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4306         if (!set)
4307                 return -ENOMEM;
4308
4309         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4310         if (!name) {
4311                 err = -ENOMEM;
4312                 goto err_set_name;
4313         }
4314
4315         err = nf_tables_set_alloc_name(&ctx, set, name);
4316         kfree(name);
4317         if (err < 0)
4318                 goto err_set_alloc_name;
4319
4320         if (nla[NFTA_SET_EXPR]) {
4321                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4322                 if (IS_ERR(expr)) {
4323                         err = PTR_ERR(expr);
4324                         goto err_set_alloc_name;
4325                 }
4326                 set->exprs[0] = expr;
4327                 set->num_exprs++;
4328         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4329                 struct nft_expr *expr;
4330                 struct nlattr *tmp;
4331                 int left;
4332
4333                 if (!(flags & NFT_SET_EXPR)) {
4334                         err = -EINVAL;
4335                         goto err_set_alloc_name;
4336                 }
4337                 i = 0;
4338                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4339                         if (i == NFT_SET_EXPR_MAX) {
4340                                 err = -E2BIG;
4341                                 goto err_set_init;
4342                         }
4343                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4344                                 err = -EINVAL;
4345                                 goto err_set_init;
4346                         }
4347                         expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4348                         if (IS_ERR(expr)) {
4349                                 err = PTR_ERR(expr);
4350                                 goto err_set_init;
4351                         }
4352                         set->exprs[i++] = expr;
4353                         set->num_exprs++;
4354                 }
4355         }
4356
4357         udata = NULL;
4358         if (udlen) {
4359                 udata = set->data + size;
4360                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4361         }
4362
4363         INIT_LIST_HEAD(&set->bindings);
4364         set->table = table;
4365         write_pnet(&set->net, net);
4366         set->ops   = ops;
4367         set->ktype = ktype;
4368         set->klen  = desc.klen;
4369         set->dtype = dtype;
4370         set->objtype = objtype;
4371         set->dlen  = desc.dlen;
4372         set->flags = flags;
4373         set->size  = desc.size;
4374         set->policy = policy;
4375         set->udlen  = udlen;
4376         set->udata  = udata;
4377         set->timeout = timeout;
4378         set->gc_int = gc_int;
4379         set->handle = nf_tables_alloc_handle(table);
4380
4381         set->field_count = desc.field_count;
4382         for (i = 0; i < desc.field_count; i++)
4383                 set->field_len[i] = desc.field_len[i];
4384
4385         err = ops->init(set, &desc, nla);
4386         if (err < 0)
4387                 goto err_set_init;
4388
4389         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4390         if (err < 0)
4391                 goto err_set_trans;
4392
4393         list_add_tail_rcu(&set->list, &table->sets);
4394         table->use++;
4395         return 0;
4396
4397 err_set_trans:
4398         ops->destroy(set);
4399 err_set_init:
4400         for (i = 0; i < set->num_exprs; i++)
4401                 nft_expr_destroy(&ctx, set->exprs[i]);
4402 err_set_alloc_name:
4403         kfree(set->name);
4404 err_set_name:
4405         kvfree(set);
4406         return err;
4407 }
4408
4409 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4410 {
4411         int i;
4412
4413         if (WARN_ON(set->use > 0))
4414                 return;
4415
4416         for (i = 0; i < set->num_exprs; i++)
4417                 nft_expr_destroy(ctx, set->exprs[i]);
4418
4419         set->ops->destroy(set);
4420         kfree(set->name);
4421         kvfree(set);
4422 }
4423
4424 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4425                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4426                             const struct nlattr * const nla[],
4427                             struct netlink_ext_ack *extack)
4428 {
4429         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4430         u8 genmask = nft_genmask_next(net);
4431         const struct nlattr *attr;
4432         struct nft_set *set;
4433         struct nft_ctx ctx;
4434         int err;
4435
4436         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4437                 return -EAFNOSUPPORT;
4438         if (nla[NFTA_SET_TABLE] == NULL)
4439                 return -EINVAL;
4440
4441         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4442                                         genmask, NETLINK_CB(skb).portid);
4443         if (err < 0)
4444                 return err;
4445
4446         if (nla[NFTA_SET_HANDLE]) {
4447                 attr = nla[NFTA_SET_HANDLE];
4448                 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4449         } else {
4450                 attr = nla[NFTA_SET_NAME];
4451                 set = nft_set_lookup(ctx.table, attr, genmask);
4452         }
4453
4454         if (IS_ERR(set)) {
4455                 NL_SET_BAD_ATTR(extack, attr);
4456                 return PTR_ERR(set);
4457         }
4458         if (set->use ||
4459             (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4460                 NL_SET_BAD_ATTR(extack, attr);
4461                 return -EBUSY;
4462         }
4463
4464         return nft_delset(&ctx, set);
4465 }
4466
4467 static int nft_validate_register_store(const struct nft_ctx *ctx,
4468                                        enum nft_registers reg,
4469                                        const struct nft_data *data,
4470                                        enum nft_data_types type,
4471                                        unsigned int len);
4472
4473 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4474                                         struct nft_set *set,
4475                                         const struct nft_set_iter *iter,
4476                                         struct nft_set_elem *elem)
4477 {
4478         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4479         enum nft_registers dreg;
4480
4481         dreg = nft_type_to_reg(set->dtype);
4482         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4483                                            set->dtype == NFT_DATA_VERDICT ?
4484                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4485                                            set->dlen);
4486 }
4487
4488 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4489                        struct nft_set_binding *binding)
4490 {
4491         struct nft_set_binding *i;
4492         struct nft_set_iter iter;
4493
4494         if (set->use == UINT_MAX)
4495                 return -EOVERFLOW;
4496
4497         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4498                 return -EBUSY;
4499
4500         if (binding->flags & NFT_SET_MAP) {
4501                 /* If the set is already bound to the same chain all
4502                  * jumps are already validated for that chain.
4503                  */
4504                 list_for_each_entry(i, &set->bindings, list) {
4505                         if (i->flags & NFT_SET_MAP &&
4506                             i->chain == binding->chain)
4507                                 goto bind;
4508                 }
4509
4510                 iter.genmask    = nft_genmask_next(ctx->net);
4511                 iter.skip       = 0;
4512                 iter.count      = 0;
4513                 iter.err        = 0;
4514                 iter.fn         = nf_tables_bind_check_setelem;
4515
4516                 set->ops->walk(ctx, set, &iter);
4517                 if (iter.err < 0)
4518                         return iter.err;
4519         }
4520 bind:
4521         binding->chain = ctx->chain;
4522         list_add_tail_rcu(&binding->list, &set->bindings);
4523         nft_set_trans_bind(ctx, set);
4524         set->use++;
4525
4526         return 0;
4527 }
4528 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4529
4530 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4531                                  struct nft_set_binding *binding, bool event)
4532 {
4533         list_del_rcu(&binding->list);
4534
4535         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4536                 list_del_rcu(&set->list);
4537                 if (event)
4538                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4539                                              GFP_KERNEL);
4540         }
4541 }
4542
4543 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4544                               struct nft_set_binding *binding,
4545                               enum nft_trans_phase phase)
4546 {
4547         switch (phase) {
4548         case NFT_TRANS_PREPARE:
4549                 set->use--;
4550                 return;
4551         case NFT_TRANS_ABORT:
4552         case NFT_TRANS_RELEASE:
4553                 set->use--;
4554                 fallthrough;
4555         default:
4556                 nf_tables_unbind_set(ctx, set, binding,
4557                                      phase == NFT_TRANS_COMMIT);
4558         }
4559 }
4560 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4561
4562 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4563 {
4564         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4565                 nft_set_destroy(ctx, set);
4566 }
4567 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4568
4569 const struct nft_set_ext_type nft_set_ext_types[] = {
4570         [NFT_SET_EXT_KEY]               = {
4571                 .align  = __alignof__(u32),
4572         },
4573         [NFT_SET_EXT_DATA]              = {
4574                 .align  = __alignof__(u32),
4575         },
4576         [NFT_SET_EXT_EXPRESSIONS]       = {
4577                 .align  = __alignof__(struct nft_set_elem_expr),
4578         },
4579         [NFT_SET_EXT_OBJREF]            = {
4580                 .len    = sizeof(struct nft_object *),
4581                 .align  = __alignof__(struct nft_object *),
4582         },
4583         [NFT_SET_EXT_FLAGS]             = {
4584                 .len    = sizeof(u8),
4585                 .align  = __alignof__(u8),
4586         },
4587         [NFT_SET_EXT_TIMEOUT]           = {
4588                 .len    = sizeof(u64),
4589                 .align  = __alignof__(u64),
4590         },
4591         [NFT_SET_EXT_EXPIRATION]        = {
4592                 .len    = sizeof(u64),
4593                 .align  = __alignof__(u64),
4594         },
4595         [NFT_SET_EXT_USERDATA]          = {
4596                 .len    = sizeof(struct nft_userdata),
4597                 .align  = __alignof__(struct nft_userdata),
4598         },
4599         [NFT_SET_EXT_KEY_END]           = {
4600                 .align  = __alignof__(u32),
4601         },
4602 };
4603
4604 /*
4605  * Set elements
4606  */
4607
4608 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4609         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4610         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4611         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4612         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4613         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4614         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4615                                             .len = NFT_USERDATA_MAXLEN },
4616         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4617         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4618                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4619         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4620         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4621 };
4622
4623 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4624         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4625                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4626         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4627                                             .len = NFT_SET_MAXNAMELEN - 1 },
4628         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4629         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4630 };
4631
4632 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4633                                       const struct sk_buff *skb,
4634                                       const struct nlmsghdr *nlh,
4635                                       const struct nlattr * const nla[],
4636                                       struct netlink_ext_ack *extack,
4637                                       u8 genmask, u32 nlpid)
4638 {
4639         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4640         int family = nfmsg->nfgen_family;
4641         struct nft_table *table;
4642
4643         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4644                                  genmask, nlpid);
4645         if (IS_ERR(table)) {
4646                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4647                 return PTR_ERR(table);
4648         }
4649
4650         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4651         return 0;
4652 }
4653
4654 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4655                                   const struct nft_set *set,
4656                                   const struct nft_set_ext *ext)
4657 {
4658         struct nft_set_elem_expr *elem_expr;
4659         u32 size, num_exprs = 0;
4660         struct nft_expr *expr;
4661         struct nlattr *nest;
4662
4663         elem_expr = nft_set_ext_expr(ext);
4664         nft_setelem_expr_foreach(expr, elem_expr, size)
4665                 num_exprs++;
4666
4667         if (num_exprs == 1) {
4668                 expr = nft_setelem_expr_at(elem_expr, 0);
4669                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4670                         return -1;
4671
4672                 return 0;
4673         } else if (num_exprs > 1) {
4674                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4675                 if (nest == NULL)
4676                         goto nla_put_failure;
4677
4678                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4679                         expr = nft_setelem_expr_at(elem_expr, size);
4680                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4681                                 goto nla_put_failure;
4682                 }
4683                 nla_nest_end(skb, nest);
4684         }
4685         return 0;
4686
4687 nla_put_failure:
4688         return -1;
4689 }
4690
4691 static int nf_tables_fill_setelem(struct sk_buff *skb,
4692                                   const struct nft_set *set,
4693                                   const struct nft_set_elem *elem)
4694 {
4695         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4696         unsigned char *b = skb_tail_pointer(skb);
4697         struct nlattr *nest;
4698
4699         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4700         if (nest == NULL)
4701                 goto nla_put_failure;
4702
4703         if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4704                           NFT_DATA_VALUE, set->klen) < 0)
4705                 goto nla_put_failure;
4706
4707         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4708             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4709                           NFT_DATA_VALUE, set->klen) < 0)
4710                 goto nla_put_failure;
4711
4712         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4713             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4714                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4715                           set->dlen) < 0)
4716                 goto nla_put_failure;
4717
4718         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4719             nft_set_elem_expr_dump(skb, set, ext))
4720                 goto nla_put_failure;
4721
4722         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4723             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4724                            (*nft_set_ext_obj(ext))->key.name) < 0)
4725                 goto nla_put_failure;
4726
4727         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4728             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4729                          htonl(*nft_set_ext_flags(ext))))
4730                 goto nla_put_failure;
4731
4732         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4733             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4734                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4735                          NFTA_SET_ELEM_PAD))
4736                 goto nla_put_failure;
4737
4738         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4739                 u64 expires, now = get_jiffies_64();
4740
4741                 expires = *nft_set_ext_expiration(ext);
4742                 if (time_before64(now, expires))
4743                         expires -= now;
4744                 else
4745                         expires = 0;
4746
4747                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4748                                  nf_jiffies64_to_msecs(expires),
4749                                  NFTA_SET_ELEM_PAD))
4750                         goto nla_put_failure;
4751         }
4752
4753         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4754                 struct nft_userdata *udata;
4755
4756                 udata = nft_set_ext_userdata(ext);
4757                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4758                             udata->len + 1, udata->data))
4759                         goto nla_put_failure;
4760         }
4761
4762         nla_nest_end(skb, nest);
4763         return 0;
4764
4765 nla_put_failure:
4766         nlmsg_trim(skb, b);
4767         return -EMSGSIZE;
4768 }
4769
4770 struct nft_set_dump_args {
4771         const struct netlink_callback   *cb;
4772         struct nft_set_iter             iter;
4773         struct sk_buff                  *skb;
4774 };
4775
4776 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4777                                   struct nft_set *set,
4778                                   const struct nft_set_iter *iter,
4779                                   struct nft_set_elem *elem)
4780 {
4781         struct nft_set_dump_args *args;
4782
4783         args = container_of(iter, struct nft_set_dump_args, iter);
4784         return nf_tables_fill_setelem(args->skb, set, elem);
4785 }
4786
4787 struct nft_set_dump_ctx {
4788         const struct nft_set    *set;
4789         struct nft_ctx          ctx;
4790 };
4791
4792 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4793 {
4794         struct nft_set_dump_ctx *dump_ctx = cb->data;
4795         struct net *net = sock_net(skb->sk);
4796         struct nft_table *table;
4797         struct nft_set *set;
4798         struct nft_set_dump_args args;
4799         bool set_found = false;
4800         struct nfgenmsg *nfmsg;
4801         struct nlmsghdr *nlh;
4802         struct nlattr *nest;
4803         u32 portid, seq;
4804         int event;
4805
4806         rcu_read_lock();
4807         list_for_each_entry_rcu(table, &net->nft.tables, list) {
4808                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4809                     dump_ctx->ctx.family != table->family)
4810                         continue;
4811
4812                 if (table != dump_ctx->ctx.table)
4813                         continue;
4814
4815                 list_for_each_entry_rcu(set, &table->sets, list) {
4816                         if (set == dump_ctx->set) {
4817                                 set_found = true;
4818                                 break;
4819                         }
4820                 }
4821                 break;
4822         }
4823
4824         if (!set_found) {
4825                 rcu_read_unlock();
4826                 return -ENOENT;
4827         }
4828
4829         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4830         portid = NETLINK_CB(cb->skb).portid;
4831         seq    = cb->nlh->nlmsg_seq;
4832
4833         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4834                         NLM_F_MULTI);
4835         if (nlh == NULL)
4836                 goto nla_put_failure;
4837
4838         nfmsg = nlmsg_data(nlh);
4839         nfmsg->nfgen_family = table->family;
4840         nfmsg->version      = NFNETLINK_V0;
4841         nfmsg->res_id       = htons(net->nft.base_seq & 0xffff);
4842
4843         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4844                 goto nla_put_failure;
4845         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4846                 goto nla_put_failure;
4847
4848         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4849         if (nest == NULL)
4850                 goto nla_put_failure;
4851
4852         args.cb                 = cb;
4853         args.skb                = skb;
4854         args.iter.genmask       = nft_genmask_cur(net);
4855         args.iter.skip          = cb->args[0];
4856         args.iter.count         = 0;
4857         args.iter.err           = 0;
4858         args.iter.fn            = nf_tables_dump_setelem;
4859         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4860         rcu_read_unlock();
4861
4862         nla_nest_end(skb, nest);
4863         nlmsg_end(skb, nlh);
4864
4865         if (args.iter.err && args.iter.err != -EMSGSIZE)
4866                 return args.iter.err;
4867         if (args.iter.count == cb->args[0])
4868                 return 0;
4869
4870         cb->args[0] = args.iter.count;
4871         return skb->len;
4872
4873 nla_put_failure:
4874         rcu_read_unlock();
4875         return -ENOSPC;
4876 }
4877
4878 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4879 {
4880         struct nft_set_dump_ctx *dump_ctx = cb->data;
4881
4882         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4883
4884         return cb->data ? 0 : -ENOMEM;
4885 }
4886
4887 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4888 {
4889         kfree(cb->data);
4890         return 0;
4891 }
4892
4893 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4894                                        const struct nft_ctx *ctx, u32 seq,
4895                                        u32 portid, int event, u16 flags,
4896                                        const struct nft_set *set,
4897                                        const struct nft_set_elem *elem)
4898 {
4899         struct nfgenmsg *nfmsg;
4900         struct nlmsghdr *nlh;
4901         struct nlattr *nest;
4902         int err;
4903
4904         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4905         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4906                         flags);
4907         if (nlh == NULL)
4908                 goto nla_put_failure;
4909
4910         nfmsg = nlmsg_data(nlh);
4911         nfmsg->nfgen_family     = ctx->family;
4912         nfmsg->version          = NFNETLINK_V0;
4913         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
4914
4915         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4916                 goto nla_put_failure;
4917         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4918                 goto nla_put_failure;
4919
4920         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4921         if (nest == NULL)
4922                 goto nla_put_failure;
4923
4924         err = nf_tables_fill_setelem(skb, set, elem);
4925         if (err < 0)
4926                 goto nla_put_failure;
4927
4928         nla_nest_end(skb, nest);
4929
4930         nlmsg_end(skb, nlh);
4931         return 0;
4932
4933 nla_put_failure:
4934         nlmsg_trim(skb, nlh);
4935         return -1;
4936 }
4937
4938 static int nft_setelem_parse_flags(const struct nft_set *set,
4939                                    const struct nlattr *attr, u32 *flags)
4940 {
4941         if (attr == NULL)
4942                 return 0;
4943
4944         *flags = ntohl(nla_get_be32(attr));
4945         if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4946                 return -EINVAL;
4947         if (!(set->flags & NFT_SET_INTERVAL) &&
4948             *flags & NFT_SET_ELEM_INTERVAL_END)
4949                 return -EINVAL;
4950
4951         return 0;
4952 }
4953
4954 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4955                                  struct nft_data *key, struct nlattr *attr)
4956 {
4957         struct nft_data_desc desc;
4958         int err;
4959
4960         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4961         if (err < 0)
4962                 return err;
4963
4964         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4965                 nft_data_release(key, desc.type);
4966                 return -EINVAL;
4967         }
4968
4969         return 0;
4970 }
4971
4972 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4973                                   struct nft_data_desc *desc,
4974                                   struct nft_data *data,
4975                                   struct nlattr *attr)
4976 {
4977         int err;
4978
4979         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4980         if (err < 0)
4981                 return err;
4982
4983         if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4984                 nft_data_release(data, desc->type);
4985                 return -EINVAL;
4986         }
4987
4988         return 0;
4989 }
4990
4991 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4992                             const struct nlattr *attr)
4993 {
4994         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4995         struct nft_set_elem elem;
4996         struct sk_buff *skb;
4997         uint32_t flags = 0;
4998         void *priv;
4999         int err;
5000
5001         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5002                                           nft_set_elem_policy, NULL);
5003         if (err < 0)
5004                 return err;
5005
5006         if (!nla[NFTA_SET_ELEM_KEY])
5007                 return -EINVAL;
5008
5009         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5010         if (err < 0)
5011                 return err;
5012
5013         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5014                                     nla[NFTA_SET_ELEM_KEY]);
5015         if (err < 0)
5016                 return err;
5017
5018         if (nla[NFTA_SET_ELEM_KEY_END]) {
5019                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5020                                             nla[NFTA_SET_ELEM_KEY_END]);
5021                 if (err < 0)
5022                         return err;
5023         }
5024
5025         priv = set->ops->get(ctx->net, set, &elem, flags);
5026         if (IS_ERR(priv))
5027                 return PTR_ERR(priv);
5028
5029         elem.priv = priv;
5030
5031         err = -ENOMEM;
5032         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5033         if (skb == NULL)
5034                 return err;
5035
5036         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5037                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5038         if (err < 0)
5039                 goto err_fill_setelem;
5040
5041         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5042
5043 err_fill_setelem:
5044         kfree_skb(skb);
5045         return err;
5046 }
5047
5048 /* called with rcu_read_lock held */
5049 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
5050                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5051                                 const struct nlattr * const nla[],
5052                                 struct netlink_ext_ack *extack)
5053 {
5054         u8 genmask = nft_genmask_cur(net);
5055         struct nft_set *set;
5056         struct nlattr *attr;
5057         struct nft_ctx ctx;
5058         int rem, err = 0;
5059
5060         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5061                                          genmask, NETLINK_CB(skb).portid);
5062         if (err < 0)
5063                 return err;
5064
5065         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5066         if (IS_ERR(set))
5067                 return PTR_ERR(set);
5068
5069         if (nlh->nlmsg_flags & NLM_F_DUMP) {
5070                 struct netlink_dump_control c = {
5071                         .start = nf_tables_dump_set_start,
5072                         .dump = nf_tables_dump_set,
5073                         .done = nf_tables_dump_set_done,
5074                         .module = THIS_MODULE,
5075                 };
5076                 struct nft_set_dump_ctx dump_ctx = {
5077                         .set = set,
5078                         .ctx = ctx,
5079                 };
5080
5081                 c.data = &dump_ctx;
5082                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5083         }
5084
5085         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5086                 return -EINVAL;
5087
5088         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5089                 err = nft_get_set_elem(&ctx, set, attr);
5090                 if (err < 0)
5091                         break;
5092         }
5093
5094         return err;
5095 }
5096
5097 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5098                                      const struct nft_set *set,
5099                                      const struct nft_set_elem *elem,
5100                                      int event, u16 flags)
5101 {
5102         struct net *net = ctx->net;
5103         u32 portid = ctx->portid;
5104         struct sk_buff *skb;
5105         int err;
5106         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
5107                               ctx->table->name, ctx->table->handle,
5108                               set->name, set->handle);
5109
5110         audit_log_nfcfg(buf,
5111                         ctx->family,
5112                         set->handle,
5113                         event == NFT_MSG_NEWSETELEM ?
5114                                 AUDIT_NFT_OP_SETELEM_REGISTER :
5115                                 AUDIT_NFT_OP_SETELEM_UNREGISTER,
5116                         GFP_KERNEL);
5117         kfree(buf);
5118
5119         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5120                 return;
5121
5122         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5123         if (skb == NULL)
5124                 goto err;
5125
5126         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5127                                           set, elem);
5128         if (err < 0) {
5129                 kfree_skb(skb);
5130                 goto err;
5131         }
5132
5133         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
5134         return;
5135 err:
5136         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5137 }
5138
5139 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5140                                               int msg_type,
5141                                               struct nft_set *set)
5142 {
5143         struct nft_trans *trans;
5144
5145         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5146         if (trans == NULL)
5147                 return NULL;
5148
5149         nft_trans_elem_set(trans) = set;
5150         return trans;
5151 }
5152
5153 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5154                                          const struct nft_set *set,
5155                                          const struct nlattr *attr)
5156 {
5157         struct nft_expr *expr;
5158         int err;
5159
5160         expr = nft_expr_init(ctx, attr);
5161         if (IS_ERR(expr))
5162                 return expr;
5163
5164         err = -EOPNOTSUPP;
5165         if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5166                 goto err_set_elem_expr;
5167
5168         if (expr->ops->type->flags & NFT_EXPR_GC) {
5169                 if (set->flags & NFT_SET_TIMEOUT)
5170                         goto err_set_elem_expr;
5171                 if (!set->ops->gc_init)
5172                         goto err_set_elem_expr;
5173                 set->ops->gc_init(set);
5174         }
5175
5176         return expr;
5177
5178 err_set_elem_expr:
5179         nft_expr_destroy(ctx, expr);
5180         return ERR_PTR(err);
5181 }
5182
5183 void *nft_set_elem_init(const struct nft_set *set,
5184                         const struct nft_set_ext_tmpl *tmpl,
5185                         const u32 *key, const u32 *key_end,
5186                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5187 {
5188         struct nft_set_ext *ext;
5189         void *elem;
5190
5191         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5192         if (elem == NULL)
5193                 return NULL;
5194
5195         ext = nft_set_elem_ext(set, elem);
5196         nft_set_ext_init(ext, tmpl);
5197
5198         memcpy(nft_set_ext_key(ext), key, set->klen);
5199         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5200                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5201         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5202                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5203         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5204                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5205                 if (expiration == 0)
5206                         *nft_set_ext_expiration(ext) += timeout;
5207         }
5208         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5209                 *nft_set_ext_timeout(ext) = timeout;
5210
5211         return elem;
5212 }
5213
5214 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5215                                         struct nft_expr *expr)
5216 {
5217         if (expr->ops->destroy_clone) {
5218                 expr->ops->destroy_clone(ctx, expr);
5219                 module_put(expr->ops->type->owner);
5220         } else {
5221                 nf_tables_expr_destroy(ctx, expr);
5222         }
5223 }
5224
5225 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5226                                       struct nft_set_elem_expr *elem_expr)
5227 {
5228         struct nft_expr *expr;
5229         u32 size;
5230
5231         nft_setelem_expr_foreach(expr, elem_expr, size)
5232                 __nft_set_elem_expr_destroy(ctx, expr);
5233 }
5234
5235 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5236                           bool destroy_expr)
5237 {
5238         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5239         struct nft_ctx ctx = {
5240                 .net    = read_pnet(&set->net),
5241                 .family = set->table->family,
5242         };
5243
5244         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5245         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5246                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5247         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5248                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5249
5250         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5251                 (*nft_set_ext_obj(ext))->use--;
5252         kfree(elem);
5253 }
5254 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5255
5256 /* Only called from commit path, nft_set_elem_deactivate() already deals with
5257  * the refcounting from the preparation phase.
5258  */
5259 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5260                                        const struct nft_set *set, void *elem)
5261 {
5262         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5263
5264         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5265                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5266
5267         kfree(elem);
5268 }
5269
5270 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5271                             struct nft_expr *expr_array[])
5272 {
5273         struct nft_expr *expr;
5274         int err, i, k;
5275
5276         for (i = 0; i < set->num_exprs; i++) {
5277                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5278                 if (!expr)
5279                         goto err_expr;
5280
5281                 err = nft_expr_clone(expr, set->exprs[i]);
5282                 if (err < 0) {
5283                         nft_expr_destroy(ctx, expr);
5284                         goto err_expr;
5285                 }
5286                 expr_array[i] = expr;
5287         }
5288
5289         return 0;
5290
5291 err_expr:
5292         for (k = i - 1; k >= 0; k--)
5293                 nft_expr_destroy(ctx, expr_array[k]);
5294
5295         return -ENOMEM;
5296 }
5297
5298 static void nft_set_elem_expr_setup(const struct nft_set_ext *ext, int i,
5299                                     struct nft_expr *expr_array[])
5300 {
5301         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5302         struct nft_expr *expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5303
5304         memcpy(expr, expr_array[i], expr_array[i]->ops->size);
5305         elem_expr->size += expr_array[i]->ops->size;
5306         kfree(expr_array[i]);
5307         expr_array[i] = NULL;
5308 }
5309
5310 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5311                             const struct nlattr *attr, u32 nlmsg_flags)
5312 {
5313         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5314         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5315         u8 genmask = nft_genmask_next(ctx->net);
5316         u32 flags = 0, size = 0, num_exprs = 0;
5317         struct nft_set_ext_tmpl tmpl;
5318         struct nft_set_ext *ext, *ext2;
5319         struct nft_set_elem elem;
5320         struct nft_set_binding *binding;
5321         struct nft_object *obj = NULL;
5322         struct nft_userdata *udata;
5323         struct nft_data_desc desc;
5324         enum nft_registers dreg;
5325         struct nft_trans *trans;
5326         u64 timeout;
5327         u64 expiration;
5328         int err, i;
5329         u8 ulen;
5330
5331         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5332                                           nft_set_elem_policy, NULL);
5333         if (err < 0)
5334                 return err;
5335
5336         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5337                 return -EINVAL;
5338
5339         nft_set_ext_prepare(&tmpl);
5340
5341         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5342         if (err < 0)
5343                 return err;
5344         if (flags != 0)
5345                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5346
5347         if (set->flags & NFT_SET_MAP) {
5348                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5349                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5350                         return -EINVAL;
5351         } else {
5352                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5353                         return -EINVAL;
5354         }
5355
5356         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5357              (nla[NFTA_SET_ELEM_DATA] ||
5358               nla[NFTA_SET_ELEM_OBJREF] ||
5359               nla[NFTA_SET_ELEM_TIMEOUT] ||
5360               nla[NFTA_SET_ELEM_EXPIRATION] ||
5361               nla[NFTA_SET_ELEM_USERDATA] ||
5362               nla[NFTA_SET_ELEM_EXPR] ||
5363               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5364                 return -EINVAL;
5365
5366         timeout = 0;
5367         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5368                 if (!(set->flags & NFT_SET_TIMEOUT))
5369                         return -EINVAL;
5370                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5371                                             &timeout);
5372                 if (err)
5373                         return err;
5374         } else if (set->flags & NFT_SET_TIMEOUT) {
5375                 timeout = set->timeout;
5376         }
5377
5378         expiration = 0;
5379         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5380                 if (!(set->flags & NFT_SET_TIMEOUT))
5381                         return -EINVAL;
5382                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5383                                             &expiration);
5384                 if (err)
5385                         return err;
5386         }
5387
5388         if (nla[NFTA_SET_ELEM_EXPR]) {
5389                 struct nft_expr *expr;
5390
5391                 if (set->num_exprs && set->num_exprs != 1)
5392                         return -EOPNOTSUPP;
5393
5394                 expr = nft_set_elem_expr_alloc(ctx, set,
5395                                                nla[NFTA_SET_ELEM_EXPR]);
5396                 if (IS_ERR(expr))
5397                         return PTR_ERR(expr);
5398
5399                 expr_array[0] = expr;
5400                 num_exprs = 1;
5401
5402                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5403                         err = -EOPNOTSUPP;
5404                         goto err_set_elem_expr;
5405                 }
5406         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5407                 struct nft_expr *expr;
5408                 struct nlattr *tmp;
5409                 int left;
5410
5411                 i = 0;
5412                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5413                         if (i == NFT_SET_EXPR_MAX ||
5414                             (set->num_exprs && set->num_exprs == i)) {
5415                                 err = -E2BIG;
5416                                 goto err_set_elem_expr;
5417                         }
5418                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
5419                                 err = -EINVAL;
5420                                 goto err_set_elem_expr;
5421                         }
5422                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5423                         if (IS_ERR(expr)) {
5424                                 err = PTR_ERR(expr);
5425                                 goto err_set_elem_expr;
5426                         }
5427                         expr_array[i] = expr;
5428                         num_exprs++;
5429
5430                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5431                                 err = -EOPNOTSUPP;
5432                                 goto err_set_elem_expr;
5433                         }
5434                         i++;
5435                 }
5436                 if (set->num_exprs && set->num_exprs != i) {
5437                         err = -EOPNOTSUPP;
5438                         goto err_set_elem_expr;
5439                 }
5440         } else if (set->num_exprs > 0) {
5441                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5442                 if (err < 0)
5443                         goto err_set_elem_expr_clone;
5444
5445                 num_exprs = set->num_exprs;
5446         }
5447
5448         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5449                                     nla[NFTA_SET_ELEM_KEY]);
5450         if (err < 0)
5451                 goto err_set_elem_expr;
5452
5453         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5454
5455         if (nla[NFTA_SET_ELEM_KEY_END]) {
5456                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5457                                             nla[NFTA_SET_ELEM_KEY_END]);
5458                 if (err < 0)
5459                         goto err_parse_key;
5460
5461                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5462         }
5463
5464         if (timeout > 0) {
5465                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5466                 if (timeout != set->timeout)
5467                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5468         }
5469
5470         if (num_exprs) {
5471                 for (i = 0; i < num_exprs; i++)
5472                         size += expr_array[i]->ops->size;
5473
5474                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5475                                        sizeof(struct nft_set_elem_expr) +
5476                                        size);
5477         }
5478
5479         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5480                 if (!(set->flags & NFT_SET_OBJECT)) {
5481                         err = -EINVAL;
5482                         goto err_parse_key_end;
5483                 }
5484                 obj = nft_obj_lookup(ctx->net, ctx->table,
5485                                      nla[NFTA_SET_ELEM_OBJREF],
5486                                      set->objtype, genmask);
5487                 if (IS_ERR(obj)) {
5488                         err = PTR_ERR(obj);
5489                         goto err_parse_key_end;
5490                 }
5491                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5492         }
5493
5494         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5495                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5496                                              nla[NFTA_SET_ELEM_DATA]);
5497                 if (err < 0)
5498                         goto err_parse_key_end;
5499
5500                 dreg = nft_type_to_reg(set->dtype);
5501                 list_for_each_entry(binding, &set->bindings, list) {
5502                         struct nft_ctx bind_ctx = {
5503                                 .net    = ctx->net,
5504                                 .family = ctx->family,
5505                                 .table  = ctx->table,
5506                                 .chain  = (struct nft_chain *)binding->chain,
5507                         };
5508
5509                         if (!(binding->flags & NFT_SET_MAP))
5510                                 continue;
5511
5512                         err = nft_validate_register_store(&bind_ctx, dreg,
5513                                                           &elem.data.val,
5514                                                           desc.type, desc.len);
5515                         if (err < 0)
5516                                 goto err_parse_data;
5517
5518                         if (desc.type == NFT_DATA_VERDICT &&
5519                             (elem.data.val.verdict.code == NFT_GOTO ||
5520                              elem.data.val.verdict.code == NFT_JUMP))
5521                                 nft_validate_state_update(ctx->net,
5522                                                           NFT_VALIDATE_NEED);
5523                 }
5524
5525                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5526         }
5527
5528         /* The full maximum length of userdata can exceed the maximum
5529          * offset value (U8_MAX) for following extensions, therefor it
5530          * must be the last extension added.
5531          */
5532         ulen = 0;
5533         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5534                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5535                 if (ulen > 0)
5536                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5537                                                ulen);
5538         }
5539
5540         err = -ENOMEM;
5541         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5542                                       elem.key_end.val.data, elem.data.val.data,
5543                                       timeout, expiration, GFP_KERNEL);
5544         if (elem.priv == NULL)
5545                 goto err_parse_data;
5546
5547         ext = nft_set_elem_ext(set, elem.priv);
5548         if (flags)
5549                 *nft_set_ext_flags(ext) = flags;
5550         if (ulen > 0) {
5551                 udata = nft_set_ext_userdata(ext);
5552                 udata->len = ulen - 1;
5553                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5554         }
5555         if (obj) {
5556                 *nft_set_ext_obj(ext) = obj;
5557                 obj->use++;
5558         }
5559         for (i = 0; i < num_exprs; i++)
5560                 nft_set_elem_expr_setup(ext, i, expr_array);
5561
5562         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5563         if (trans == NULL)
5564                 goto err_trans;
5565
5566         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5567         err = set->ops->insert(ctx->net, set, &elem, &ext2);
5568         if (err) {
5569                 if (err == -EEXIST) {
5570                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5571                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5572                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5573                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5574                                 goto err_element_clash;
5575                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5576                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5577                              memcmp(nft_set_ext_data(ext),
5578                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
5579                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5580                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5581                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5582                                 goto err_element_clash;
5583                         else if (!(nlmsg_flags & NLM_F_EXCL))
5584                                 err = 0;
5585                 } else if (err == -ENOTEMPTY) {
5586                         /* ENOTEMPTY reports overlapping between this element
5587                          * and an existing one.
5588                          */
5589                         err = -EEXIST;
5590                 }
5591                 goto err_element_clash;
5592         }
5593
5594         if (set->size &&
5595             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5596                 err = -ENFILE;
5597                 goto err_set_full;
5598         }
5599
5600         nft_trans_elem(trans) = elem;
5601         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5602         return 0;
5603
5604 err_set_full:
5605         set->ops->remove(ctx->net, set, &elem);
5606 err_element_clash:
5607         kfree(trans);
5608 err_trans:
5609         if (obj)
5610                 obj->use--;
5611
5612         nf_tables_set_elem_destroy(ctx, set, elem.priv);
5613 err_parse_data:
5614         if (nla[NFTA_SET_ELEM_DATA] != NULL)
5615                 nft_data_release(&elem.data.val, desc.type);
5616 err_parse_key_end:
5617         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5618 err_parse_key:
5619         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5620 err_set_elem_expr:
5621         for (i = 0; i < num_exprs && expr_array[i]; i++)
5622                 nft_expr_destroy(ctx, expr_array[i]);
5623 err_set_elem_expr_clone:
5624         return err;
5625 }
5626
5627 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5628                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5629                                 const struct nlattr * const nla[],
5630                                 struct netlink_ext_ack *extack)
5631 {
5632         u8 genmask = nft_genmask_next(net);
5633         const struct nlattr *attr;
5634         struct nft_set *set;
5635         struct nft_ctx ctx;
5636         int rem, err;
5637
5638         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5639                 return -EINVAL;
5640
5641         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5642                                          genmask, NETLINK_CB(skb).portid);
5643         if (err < 0)
5644                 return err;
5645
5646         set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5647                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5648         if (IS_ERR(set))
5649                 return PTR_ERR(set);
5650
5651         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5652                 return -EBUSY;
5653
5654         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5655                 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5656                 if (err < 0)
5657                         return err;
5658         }
5659
5660         if (net->nft.validate_state == NFT_VALIDATE_DO)
5661                 return nft_table_validate(net, ctx.table);
5662
5663         return 0;
5664 }
5665
5666 /**
5667  *      nft_data_hold - hold a nft_data item
5668  *
5669  *      @data: struct nft_data to release
5670  *      @type: type of data
5671  *
5672  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5673  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5674  *      NFT_GOTO verdicts. This function must be called on active data objects
5675  *      from the second phase of the commit protocol.
5676  */
5677 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5678 {
5679         struct nft_chain *chain;
5680         struct nft_rule *rule;
5681
5682         if (type == NFT_DATA_VERDICT) {
5683                 switch (data->verdict.code) {
5684                 case NFT_JUMP:
5685                 case NFT_GOTO:
5686                         chain = data->verdict.chain;
5687                         chain->use++;
5688
5689                         if (!nft_chain_is_bound(chain))
5690                                 break;
5691
5692                         chain->table->use++;
5693                         list_for_each_entry(rule, &chain->rules, list)
5694                                 chain->use++;
5695
5696                         nft_chain_add(chain->table, chain);
5697                         break;
5698                 }
5699         }
5700 }
5701
5702 static void nft_set_elem_activate(const struct net *net,
5703                                   const struct nft_set *set,
5704                                   struct nft_set_elem *elem)
5705 {
5706         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5707
5708         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5709                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5710         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5711                 (*nft_set_ext_obj(ext))->use++;
5712 }
5713
5714 static void nft_set_elem_deactivate(const struct net *net,
5715                                     const struct nft_set *set,
5716                                     struct nft_set_elem *elem)
5717 {
5718         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5719
5720         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5721                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5722         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5723                 (*nft_set_ext_obj(ext))->use--;
5724 }
5725
5726 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5727                            const struct nlattr *attr)
5728 {
5729         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5730         struct nft_set_ext_tmpl tmpl;
5731         struct nft_set_elem elem;
5732         struct nft_set_ext *ext;
5733         struct nft_trans *trans;
5734         u32 flags = 0;
5735         void *priv;
5736         int err;
5737
5738         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5739                                           nft_set_elem_policy, NULL);
5740         if (err < 0)
5741                 return err;
5742
5743         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5744                 return -EINVAL;
5745
5746         nft_set_ext_prepare(&tmpl);
5747
5748         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5749         if (err < 0)
5750                 return err;
5751         if (flags != 0)
5752                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5753
5754         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5755                                     nla[NFTA_SET_ELEM_KEY]);
5756         if (err < 0)
5757                 return err;
5758
5759         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5760
5761         if (nla[NFTA_SET_ELEM_KEY_END]) {
5762                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5763                                             nla[NFTA_SET_ELEM_KEY_END]);
5764                 if (err < 0)
5765                         return err;
5766
5767                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5768         }
5769
5770         err = -ENOMEM;
5771         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5772                                       elem.key_end.val.data, NULL, 0, 0,
5773                                       GFP_KERNEL);
5774         if (elem.priv == NULL)
5775                 goto fail_elem;
5776
5777         ext = nft_set_elem_ext(set, elem.priv);
5778         if (flags)
5779                 *nft_set_ext_flags(ext) = flags;
5780
5781         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5782         if (trans == NULL)
5783                 goto fail_trans;
5784
5785         priv = set->ops->deactivate(ctx->net, set, &elem);
5786         if (priv == NULL) {
5787                 err = -ENOENT;
5788                 goto fail_ops;
5789         }
5790         kfree(elem.priv);
5791         elem.priv = priv;
5792
5793         nft_set_elem_deactivate(ctx->net, set, &elem);
5794
5795         nft_trans_elem(trans) = elem;
5796         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5797         return 0;
5798
5799 fail_ops:
5800         kfree(trans);
5801 fail_trans:
5802         kfree(elem.priv);
5803 fail_elem:
5804         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5805         return err;
5806 }
5807
5808 static int nft_flush_set(const struct nft_ctx *ctx,
5809                          struct nft_set *set,
5810                          const struct nft_set_iter *iter,
5811                          struct nft_set_elem *elem)
5812 {
5813         struct nft_trans *trans;
5814         int err;
5815
5816         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5817                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
5818         if (!trans)
5819                 return -ENOMEM;
5820
5821         if (!set->ops->flush(ctx->net, set, elem->priv)) {
5822                 err = -ENOENT;
5823                 goto err1;
5824         }
5825         set->ndeact++;
5826
5827         nft_set_elem_deactivate(ctx->net, set, elem);
5828         nft_trans_elem_set(trans) = set;
5829         nft_trans_elem(trans) = *elem;
5830         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5831
5832         return 0;
5833 err1:
5834         kfree(trans);
5835         return err;
5836 }
5837
5838 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5839                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5840                                 const struct nlattr * const nla[],
5841                                 struct netlink_ext_ack *extack)
5842 {
5843         u8 genmask = nft_genmask_next(net);
5844         const struct nlattr *attr;
5845         struct nft_set *set;
5846         struct nft_ctx ctx;
5847         int rem, err = 0;
5848
5849         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5850                                          genmask, NETLINK_CB(skb).portid);
5851         if (err < 0)
5852                 return err;
5853
5854         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5855         if (IS_ERR(set))
5856                 return PTR_ERR(set);
5857         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5858                 return -EBUSY;
5859
5860         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5861                 struct nft_set_iter iter = {
5862                         .genmask        = genmask,
5863                         .fn             = nft_flush_set,
5864                 };
5865                 set->ops->walk(&ctx, set, &iter);
5866
5867                 return iter.err;
5868         }
5869
5870         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5871                 err = nft_del_setelem(&ctx, set, attr);
5872                 if (err < 0)
5873                         break;
5874
5875                 set->ndeact++;
5876         }
5877         return err;
5878 }
5879
5880 void nft_set_gc_batch_release(struct rcu_head *rcu)
5881 {
5882         struct nft_set_gc_batch *gcb;
5883         unsigned int i;
5884
5885         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5886         for (i = 0; i < gcb->head.cnt; i++)
5887                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5888         kfree(gcb);
5889 }
5890
5891 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5892                                                 gfp_t gfp)
5893 {
5894         struct nft_set_gc_batch *gcb;
5895
5896         gcb = kzalloc(sizeof(*gcb), gfp);
5897         if (gcb == NULL)
5898                 return gcb;
5899         gcb->head.set = set;
5900         return gcb;
5901 }
5902
5903 /*
5904  * Stateful objects
5905  */
5906
5907 /**
5908  *      nft_register_obj- register nf_tables stateful object type
5909  *      @obj_type: object type
5910  *
5911  *      Registers the object type for use with nf_tables. Returns zero on
5912  *      success or a negative errno code otherwise.
5913  */
5914 int nft_register_obj(struct nft_object_type *obj_type)
5915 {
5916         if (obj_type->type == NFT_OBJECT_UNSPEC)
5917                 return -EINVAL;
5918
5919         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5920         list_add_rcu(&obj_type->list, &nf_tables_objects);
5921         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5922         return 0;
5923 }
5924 EXPORT_SYMBOL_GPL(nft_register_obj);
5925
5926 /**
5927  *      nft_unregister_obj - unregister nf_tables object type
5928  *      @obj_type: object type
5929  *
5930  *      Unregisters the object type for use with nf_tables.
5931  */
5932 void nft_unregister_obj(struct nft_object_type *obj_type)
5933 {
5934         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5935         list_del_rcu(&obj_type->list);
5936         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5937 }
5938 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5939
5940 struct nft_object *nft_obj_lookup(const struct net *net,
5941                                   const struct nft_table *table,
5942                                   const struct nlattr *nla, u32 objtype,
5943                                   u8 genmask)
5944 {
5945         struct nft_object_hash_key k = { .table = table };
5946         char search[NFT_OBJ_MAXNAMELEN];
5947         struct rhlist_head *tmp, *list;
5948         struct nft_object *obj;
5949
5950         nla_strscpy(search, nla, sizeof(search));
5951         k.name = search;
5952
5953         WARN_ON_ONCE(!rcu_read_lock_held() &&
5954                      !lockdep_commit_lock_is_held(net));
5955
5956         rcu_read_lock();
5957         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5958         if (!list)
5959                 goto out;
5960
5961         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5962                 if (objtype == obj->ops->type->type &&
5963                     nft_active_genmask(obj, genmask)) {
5964                         rcu_read_unlock();
5965                         return obj;
5966                 }
5967         }
5968 out:
5969         rcu_read_unlock();
5970         return ERR_PTR(-ENOENT);
5971 }
5972 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5973
5974 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5975                                                   const struct nlattr *nla,
5976                                                   u32 objtype, u8 genmask)
5977 {
5978         struct nft_object *obj;
5979
5980         list_for_each_entry(obj, &table->objects, list) {
5981                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5982                     objtype == obj->ops->type->type &&
5983                     nft_active_genmask(obj, genmask))
5984                         return obj;
5985         }
5986         return ERR_PTR(-ENOENT);
5987 }
5988
5989 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5990         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
5991                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
5992         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
5993                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
5994         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
5995         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
5996         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
5997         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
5998                                     .len = NFT_USERDATA_MAXLEN },
5999 };
6000
6001 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6002                                        const struct nft_object_type *type,
6003                                        const struct nlattr *attr)
6004 {
6005         struct nlattr **tb;
6006         const struct nft_object_ops *ops;
6007         struct nft_object *obj;
6008         int err = -ENOMEM;
6009
6010         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6011         if (!tb)
6012                 goto err1;
6013
6014         if (attr) {
6015                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6016                                                   type->policy, NULL);
6017                 if (err < 0)
6018                         goto err2;
6019         } else {
6020                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6021         }
6022
6023         if (type->select_ops) {
6024                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6025                 if (IS_ERR(ops)) {
6026                         err = PTR_ERR(ops);
6027                         goto err2;
6028                 }
6029         } else {
6030                 ops = type->ops;
6031         }
6032
6033         err = -ENOMEM;
6034         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6035         if (!obj)
6036                 goto err2;
6037
6038         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6039         if (err < 0)
6040                 goto err3;
6041
6042         obj->ops = ops;
6043
6044         kfree(tb);
6045         return obj;
6046 err3:
6047         kfree(obj);
6048 err2:
6049         kfree(tb);
6050 err1:
6051         return ERR_PTR(err);
6052 }
6053
6054 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6055                            struct nft_object *obj, bool reset)
6056 {
6057         struct nlattr *nest;
6058
6059         nest = nla_nest_start_noflag(skb, attr);
6060         if (!nest)
6061                 goto nla_put_failure;
6062         if (obj->ops->dump(skb, obj, reset) < 0)
6063                 goto nla_put_failure;
6064         nla_nest_end(skb, nest);
6065         return 0;
6066
6067 nla_put_failure:
6068         return -1;
6069 }
6070
6071 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6072 {
6073         const struct nft_object_type *type;
6074
6075         list_for_each_entry(type, &nf_tables_objects, list) {
6076                 if (objtype == type->type)
6077                         return type;
6078         }
6079         return NULL;
6080 }
6081
6082 static const struct nft_object_type *
6083 nft_obj_type_get(struct net *net, u32 objtype)
6084 {
6085         const struct nft_object_type *type;
6086
6087         type = __nft_obj_type_get(objtype);
6088         if (type != NULL && try_module_get(type->owner))
6089                 return type;
6090
6091         lockdep_nfnl_nft_mutex_not_held();
6092 #ifdef CONFIG_MODULES
6093         if (type == NULL) {
6094                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6095                         return ERR_PTR(-EAGAIN);
6096         }
6097 #endif
6098         return ERR_PTR(-ENOENT);
6099 }
6100
6101 static int nf_tables_updobj(const struct nft_ctx *ctx,
6102                             const struct nft_object_type *type,
6103                             const struct nlattr *attr,
6104                             struct nft_object *obj)
6105 {
6106         struct nft_object *newobj;
6107         struct nft_trans *trans;
6108         int err;
6109
6110         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6111                                 sizeof(struct nft_trans_obj));
6112         if (!trans)
6113                 return -ENOMEM;
6114
6115         newobj = nft_obj_init(ctx, type, attr);
6116         if (IS_ERR(newobj)) {
6117                 err = PTR_ERR(newobj);
6118                 goto err_free_trans;
6119         }
6120
6121         nft_trans_obj(trans) = obj;
6122         nft_trans_obj_update(trans) = true;
6123         nft_trans_obj_newobj(trans) = newobj;
6124         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6125
6126         return 0;
6127
6128 err_free_trans:
6129         kfree(trans);
6130         return err;
6131 }
6132
6133 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
6134                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6135                             const struct nlattr * const nla[],
6136                             struct netlink_ext_ack *extack)
6137 {
6138         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6139         const struct nft_object_type *type;
6140         u8 genmask = nft_genmask_next(net);
6141         int family = nfmsg->nfgen_family;
6142         struct nft_table *table;
6143         struct nft_object *obj;
6144         struct nft_ctx ctx;
6145         u32 objtype;
6146         int err;
6147
6148         if (!nla[NFTA_OBJ_TYPE] ||
6149             !nla[NFTA_OBJ_NAME] ||
6150             !nla[NFTA_OBJ_DATA])
6151                 return -EINVAL;
6152
6153         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6154                                  NETLINK_CB(skb).portid);
6155         if (IS_ERR(table)) {
6156                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6157                 return PTR_ERR(table);
6158         }
6159
6160         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6161         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6162         if (IS_ERR(obj)) {
6163                 err = PTR_ERR(obj);
6164                 if (err != -ENOENT) {
6165                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6166                         return err;
6167                 }
6168         } else {
6169                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6170                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6171                         return -EEXIST;
6172                 }
6173                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
6174                         return -EOPNOTSUPP;
6175
6176                 type = __nft_obj_type_get(objtype);
6177                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6178
6179                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6180         }
6181
6182         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6183
6184         type = nft_obj_type_get(net, objtype);
6185         if (IS_ERR(type))
6186                 return PTR_ERR(type);
6187
6188         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6189         if (IS_ERR(obj)) {
6190                 err = PTR_ERR(obj);
6191                 goto err_init;
6192         }
6193         obj->key.table = table;
6194         obj->handle = nf_tables_alloc_handle(table);
6195
6196         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6197         if (!obj->key.name) {
6198                 err = -ENOMEM;
6199                 goto err_strdup;
6200         }
6201
6202         if (nla[NFTA_OBJ_USERDATA]) {
6203                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6204                 if (obj->udata == NULL)
6205                         goto err_userdata;
6206
6207                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6208         }
6209
6210         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6211         if (err < 0)
6212                 goto err_trans;
6213
6214         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6215                               nft_objname_ht_params);
6216         if (err < 0)
6217                 goto err_obj_ht;
6218
6219         list_add_tail_rcu(&obj->list, &table->objects);
6220         table->use++;
6221         return 0;
6222 err_obj_ht:
6223         /* queued in transaction log */
6224         INIT_LIST_HEAD(&obj->list);
6225         return err;
6226 err_trans:
6227         kfree(obj->key.name);
6228 err_userdata:
6229         kfree(obj->udata);
6230 err_strdup:
6231         if (obj->ops->destroy)
6232                 obj->ops->destroy(&ctx, obj);
6233         kfree(obj);
6234 err_init:
6235         module_put(type->owner);
6236         return err;
6237 }
6238
6239 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6240                                    u32 portid, u32 seq, int event, u32 flags,
6241                                    int family, const struct nft_table *table,
6242                                    struct nft_object *obj, bool reset)
6243 {
6244         struct nfgenmsg *nfmsg;
6245         struct nlmsghdr *nlh;
6246
6247         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6248         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6249         if (nlh == NULL)
6250                 goto nla_put_failure;
6251
6252         nfmsg = nlmsg_data(nlh);
6253         nfmsg->nfgen_family     = family;
6254         nfmsg->version          = NFNETLINK_V0;
6255         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
6256
6257         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6258             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6259             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6260             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6261             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6262             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6263                          NFTA_OBJ_PAD))
6264                 goto nla_put_failure;
6265
6266         if (obj->udata &&
6267             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6268                 goto nla_put_failure;
6269
6270         nlmsg_end(skb, nlh);
6271         return 0;
6272
6273 nla_put_failure:
6274         nlmsg_trim(skb, nlh);
6275         return -1;
6276 }
6277
6278 struct nft_obj_filter {
6279         char            *table;
6280         u32             type;
6281 };
6282
6283 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6284 {
6285         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6286         const struct nft_table *table;
6287         unsigned int idx = 0, s_idx = cb->args[0];
6288         struct nft_obj_filter *filter = cb->data;
6289         struct net *net = sock_net(skb->sk);
6290         int family = nfmsg->nfgen_family;
6291         struct nft_object *obj;
6292         bool reset = false;
6293
6294         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6295                 reset = true;
6296
6297         rcu_read_lock();
6298         cb->seq = net->nft.base_seq;
6299
6300         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6301                 if (family != NFPROTO_UNSPEC && family != table->family)
6302                         continue;
6303
6304                 list_for_each_entry_rcu(obj, &table->objects, list) {
6305                         if (!nft_is_active(net, obj))
6306                                 goto cont;
6307                         if (idx < s_idx)
6308                                 goto cont;
6309                         if (idx > s_idx)
6310                                 memset(&cb->args[1], 0,
6311                                        sizeof(cb->args) - sizeof(cb->args[0]));
6312                         if (filter && filter->table &&
6313                             strcmp(filter->table, table->name))
6314                                 goto cont;
6315                         if (filter &&
6316                             filter->type != NFT_OBJECT_UNSPEC &&
6317                             obj->ops->type->type != filter->type)
6318                                 goto cont;
6319
6320                         if (reset) {
6321                                 char *buf = kasprintf(GFP_ATOMIC,
6322                                                       "%s:%llu;?:0",
6323                                                       table->name,
6324                                                       table->handle);
6325
6326                                 audit_log_nfcfg(buf,
6327                                                 family,
6328                                                 obj->handle,
6329                                                 AUDIT_NFT_OP_OBJ_RESET,
6330                                                 GFP_ATOMIC);
6331                                 kfree(buf);
6332                         }
6333
6334                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6335                                                     cb->nlh->nlmsg_seq,
6336                                                     NFT_MSG_NEWOBJ,
6337                                                     NLM_F_MULTI | NLM_F_APPEND,
6338                                                     table->family, table,
6339                                                     obj, reset) < 0)
6340                                 goto done;
6341
6342                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6343 cont:
6344                         idx++;
6345                 }
6346         }
6347 done:
6348         rcu_read_unlock();
6349
6350         cb->args[0] = idx;
6351         return skb->len;
6352 }
6353
6354 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6355 {
6356         const struct nlattr * const *nla = cb->data;
6357         struct nft_obj_filter *filter = NULL;
6358
6359         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6360                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6361                 if (!filter)
6362                         return -ENOMEM;
6363
6364                 if (nla[NFTA_OBJ_TABLE]) {
6365                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6366                         if (!filter->table) {
6367                                 kfree(filter);
6368                                 return -ENOMEM;
6369                         }
6370                 }
6371
6372                 if (nla[NFTA_OBJ_TYPE])
6373                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6374         }
6375
6376         cb->data = filter;
6377         return 0;
6378 }
6379
6380 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6381 {
6382         struct nft_obj_filter *filter = cb->data;
6383
6384         if (filter) {
6385                 kfree(filter->table);
6386                 kfree(filter);
6387         }
6388
6389         return 0;
6390 }
6391
6392 /* called with rcu_read_lock held */
6393 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6394                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6395                             const struct nlattr * const nla[],
6396                             struct netlink_ext_ack *extack)
6397 {
6398         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6399         u8 genmask = nft_genmask_cur(net);
6400         int family = nfmsg->nfgen_family;
6401         const struct nft_table *table;
6402         struct nft_object *obj;
6403         struct sk_buff *skb2;
6404         bool reset = false;
6405         u32 objtype;
6406         int err;
6407
6408         if (nlh->nlmsg_flags & NLM_F_DUMP) {
6409                 struct netlink_dump_control c = {
6410                         .start = nf_tables_dump_obj_start,
6411                         .dump = nf_tables_dump_obj,
6412                         .done = nf_tables_dump_obj_done,
6413                         .module = THIS_MODULE,
6414                         .data = (void *)nla,
6415                 };
6416
6417                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6418         }
6419
6420         if (!nla[NFTA_OBJ_NAME] ||
6421             !nla[NFTA_OBJ_TYPE])
6422                 return -EINVAL;
6423
6424         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
6425         if (IS_ERR(table)) {
6426                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6427                 return PTR_ERR(table);
6428         }
6429
6430         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6431         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6432         if (IS_ERR(obj)) {
6433                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6434                 return PTR_ERR(obj);
6435         }
6436
6437         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6438         if (!skb2)
6439                 return -ENOMEM;
6440
6441         if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6442                 reset = true;
6443
6444         if (reset) {
6445                 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
6446                                       table->name, table->handle);
6447
6448                 audit_log_nfcfg(buf,
6449                                 family,
6450                                 obj->handle,
6451                                 AUDIT_NFT_OP_OBJ_RESET,
6452                                 GFP_ATOMIC);
6453                 kfree(buf);
6454         }
6455
6456         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6457                                       nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6458                                       family, table, obj, reset);
6459         if (err < 0)
6460                 goto err_fill_obj_info;
6461
6462         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6463
6464 err_fill_obj_info:
6465         kfree_skb(skb2);
6466         return err;
6467 }
6468
6469 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6470 {
6471         if (obj->ops->destroy)
6472                 obj->ops->destroy(ctx, obj);
6473
6474         module_put(obj->ops->type->owner);
6475         kfree(obj->key.name);
6476         kfree(obj->udata);
6477         kfree(obj);
6478 }
6479
6480 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
6481                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6482                             const struct nlattr * const nla[],
6483                             struct netlink_ext_ack *extack)
6484 {
6485         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6486         u8 genmask = nft_genmask_next(net);
6487         int family = nfmsg->nfgen_family;
6488         const struct nlattr *attr;
6489         struct nft_table *table;
6490         struct nft_object *obj;
6491         struct nft_ctx ctx;
6492         u32 objtype;
6493
6494         if (!nla[NFTA_OBJ_TYPE] ||
6495             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6496                 return -EINVAL;
6497
6498         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6499                                  NETLINK_CB(skb).portid);
6500         if (IS_ERR(table)) {
6501                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6502                 return PTR_ERR(table);
6503         }
6504
6505         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6506         if (nla[NFTA_OBJ_HANDLE]) {
6507                 attr = nla[NFTA_OBJ_HANDLE];
6508                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6509         } else {
6510                 attr = nla[NFTA_OBJ_NAME];
6511                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6512         }
6513
6514         if (IS_ERR(obj)) {
6515                 NL_SET_BAD_ATTR(extack, attr);
6516                 return PTR_ERR(obj);
6517         }
6518         if (obj->use > 0) {
6519                 NL_SET_BAD_ATTR(extack, attr);
6520                 return -EBUSY;
6521         }
6522
6523         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6524
6525         return nft_delobj(&ctx, obj);
6526 }
6527
6528 void nft_obj_notify(struct net *net, const struct nft_table *table,
6529                     struct nft_object *obj, u32 portid, u32 seq, int event,
6530                     int family, int report, gfp_t gfp)
6531 {
6532         struct sk_buff *skb;
6533         int err;
6534         char *buf = kasprintf(gfp, "%s:%llu;?:0",
6535                               table->name, table->handle);
6536
6537         audit_log_nfcfg(buf,
6538                         family,
6539                         obj->handle,
6540                         event == NFT_MSG_NEWOBJ ?
6541                                 AUDIT_NFT_OP_OBJ_REGISTER :
6542                                 AUDIT_NFT_OP_OBJ_UNREGISTER,
6543                         gfp);
6544         kfree(buf);
6545
6546         if (!report &&
6547             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6548                 return;
6549
6550         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6551         if (skb == NULL)
6552                 goto err;
6553
6554         err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6555                                       table, obj, false);
6556         if (err < 0) {
6557                 kfree_skb(skb);
6558                 goto err;
6559         }
6560
6561         nft_notify_enqueue(skb, report, &net->nft.notify_list);
6562         return;
6563 err:
6564         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6565 }
6566 EXPORT_SYMBOL_GPL(nft_obj_notify);
6567
6568 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6569                                  struct nft_object *obj, int event)
6570 {
6571         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6572                        ctx->family, ctx->report, GFP_KERNEL);
6573 }
6574
6575 /*
6576  * Flow tables
6577  */
6578 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6579 {
6580         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6581         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6582         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6583 }
6584 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6585
6586 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6587 {
6588         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6589         list_del_rcu(&type->list);
6590         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6591 }
6592 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6593
6594 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6595         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
6596                                             .len = NFT_NAME_MAXLEN - 1 },
6597         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
6598                                             .len = NFT_NAME_MAXLEN - 1 },
6599         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
6600         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
6601         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
6602 };
6603
6604 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6605                                            const struct nlattr *nla, u8 genmask)
6606 {
6607         struct nft_flowtable *flowtable;
6608
6609         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6610                 if (!nla_strcmp(nla, flowtable->name) &&
6611                     nft_active_genmask(flowtable, genmask))
6612                         return flowtable;
6613         }
6614         return ERR_PTR(-ENOENT);
6615 }
6616 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6617
6618 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6619                                     struct nft_flowtable *flowtable,
6620                                     enum nft_trans_phase phase)
6621 {
6622         switch (phase) {
6623         case NFT_TRANS_PREPARE:
6624         case NFT_TRANS_ABORT:
6625         case NFT_TRANS_RELEASE:
6626                 flowtable->use--;
6627                 fallthrough;
6628         default:
6629                 return;
6630         }
6631 }
6632 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6633
6634 static struct nft_flowtable *
6635 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6636                               const struct nlattr *nla, u8 genmask)
6637 {
6638        struct nft_flowtable *flowtable;
6639
6640        list_for_each_entry(flowtable, &table->flowtables, list) {
6641                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6642                    nft_active_genmask(flowtable, genmask))
6643                        return flowtable;
6644        }
6645        return ERR_PTR(-ENOENT);
6646 }
6647
6648 struct nft_flowtable_hook {
6649         u32                     num;
6650         int                     priority;
6651         struct list_head        list;
6652 };
6653
6654 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6655         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
6656         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
6657         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
6658 };
6659
6660 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6661                                     const struct nlattr *attr,
6662                                     struct nft_flowtable_hook *flowtable_hook,
6663                                     struct nft_flowtable *flowtable, bool add)
6664 {
6665         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6666         struct nft_hook *hook;
6667         int hooknum, priority;
6668         int err;
6669
6670         INIT_LIST_HEAD(&flowtable_hook->list);
6671
6672         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6673                                           nft_flowtable_hook_policy, NULL);
6674         if (err < 0)
6675                 return err;
6676
6677         if (add) {
6678                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6679                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6680                         return -EINVAL;
6681
6682                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6683                 if (hooknum != NF_NETDEV_INGRESS)
6684                         return -EOPNOTSUPP;
6685
6686                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6687
6688                 flowtable_hook->priority        = priority;
6689                 flowtable_hook->num             = hooknum;
6690         } else {
6691                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6692                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6693                         if (hooknum != flowtable->hooknum)
6694                                 return -EOPNOTSUPP;
6695                 }
6696
6697                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6698                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6699                         if (priority != flowtable->data.priority)
6700                                 return -EOPNOTSUPP;
6701                 }
6702
6703                 flowtable_hook->priority        = flowtable->data.priority;
6704                 flowtable_hook->num             = flowtable->hooknum;
6705         }
6706
6707         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6708                 err = nf_tables_parse_netdev_hooks(ctx->net,
6709                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
6710                                                    &flowtable_hook->list);
6711                 if (err < 0)
6712                         return err;
6713         }
6714
6715         list_for_each_entry(hook, &flowtable_hook->list, list) {
6716                 hook->ops.pf            = NFPROTO_NETDEV;
6717                 hook->ops.hooknum       = flowtable_hook->num;
6718                 hook->ops.priority      = flowtable_hook->priority;
6719                 hook->ops.priv          = &flowtable->data;
6720                 hook->ops.hook          = flowtable->data.type->hook;
6721         }
6722
6723         return err;
6724 }
6725
6726 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6727 {
6728         const struct nf_flowtable_type *type;
6729
6730         list_for_each_entry(type, &nf_tables_flowtables, list) {
6731                 if (family == type->family)
6732                         return type;
6733         }
6734         return NULL;
6735 }
6736
6737 static const struct nf_flowtable_type *
6738 nft_flowtable_type_get(struct net *net, u8 family)
6739 {
6740         const struct nf_flowtable_type *type;
6741
6742         type = __nft_flowtable_type_get(family);
6743         if (type != NULL && try_module_get(type->owner))
6744                 return type;
6745
6746         lockdep_nfnl_nft_mutex_not_held();
6747 #ifdef CONFIG_MODULES
6748         if (type == NULL) {
6749                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6750                         return ERR_PTR(-EAGAIN);
6751         }
6752 #endif
6753         return ERR_PTR(-ENOENT);
6754 }
6755
6756 /* Only called from error and netdev event paths. */
6757 static void nft_unregister_flowtable_hook(struct net *net,
6758                                           struct nft_flowtable *flowtable,
6759                                           struct nft_hook *hook)
6760 {
6761         nf_unregister_net_hook(net, &hook->ops);
6762         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6763                                     FLOW_BLOCK_UNBIND);
6764 }
6765
6766 static void nft_unregister_flowtable_net_hooks(struct net *net,
6767                                                struct list_head *hook_list)
6768 {
6769         struct nft_hook *hook;
6770
6771         list_for_each_entry(hook, hook_list, list)
6772                 nf_unregister_net_hook(net, &hook->ops);
6773 }
6774
6775 static int nft_register_flowtable_net_hooks(struct net *net,
6776                                             struct nft_table *table,
6777                                             struct list_head *hook_list,
6778                                             struct nft_flowtable *flowtable)
6779 {
6780         struct nft_hook *hook, *hook2, *next;
6781         struct nft_flowtable *ft;
6782         int err, i = 0;
6783
6784         list_for_each_entry(hook, hook_list, list) {
6785                 list_for_each_entry(ft, &table->flowtables, list) {
6786                         list_for_each_entry(hook2, &ft->hook_list, list) {
6787                                 if (hook->ops.dev == hook2->ops.dev &&
6788                                     hook->ops.pf == hook2->ops.pf) {
6789                                         err = -EEXIST;
6790                                         goto err_unregister_net_hooks;
6791                                 }
6792                         }
6793                 }
6794
6795                 err = flowtable->data.type->setup(&flowtable->data,
6796                                                   hook->ops.dev,
6797                                                   FLOW_BLOCK_BIND);
6798                 if (err < 0)
6799                         goto err_unregister_net_hooks;
6800
6801                 err = nf_register_net_hook(net, &hook->ops);
6802                 if (err < 0) {
6803                         flowtable->data.type->setup(&flowtable->data,
6804                                                     hook->ops.dev,
6805                                                     FLOW_BLOCK_UNBIND);
6806                         goto err_unregister_net_hooks;
6807                 }
6808
6809                 i++;
6810         }
6811
6812         return 0;
6813
6814 err_unregister_net_hooks:
6815         list_for_each_entry_safe(hook, next, hook_list, list) {
6816                 if (i-- <= 0)
6817                         break;
6818
6819                 nft_unregister_flowtable_hook(net, flowtable, hook);
6820                 list_del_rcu(&hook->list);
6821                 kfree_rcu(hook, rcu);
6822         }
6823
6824         return err;
6825 }
6826
6827 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6828 {
6829         struct nft_hook *hook, *next;
6830
6831         list_for_each_entry_safe(hook, next, hook_list, list) {
6832                 list_del_rcu(&hook->list);
6833                 kfree_rcu(hook, rcu);
6834         }
6835 }
6836
6837 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6838                                 struct nft_flowtable *flowtable)
6839 {
6840         const struct nlattr * const *nla = ctx->nla;
6841         struct nft_flowtable_hook flowtable_hook;
6842         struct nft_hook *hook, *next;
6843         struct nft_trans *trans;
6844         bool unregister = false;
6845         int err;
6846
6847         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6848                                        &flowtable_hook, flowtable, false);
6849         if (err < 0)
6850                 return err;
6851
6852         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6853                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6854                         list_del(&hook->list);
6855                         kfree(hook);
6856                 }
6857         }
6858
6859         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6860                                                &flowtable_hook.list, flowtable);
6861         if (err < 0)
6862                 goto err_flowtable_update_hook;
6863
6864         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6865                                 sizeof(struct nft_trans_flowtable));
6866         if (!trans) {
6867                 unregister = true;
6868                 err = -ENOMEM;
6869                 goto err_flowtable_update_hook;
6870         }
6871
6872         nft_trans_flowtable(trans) = flowtable;
6873         nft_trans_flowtable_update(trans) = true;
6874         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6875         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6876
6877         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6878
6879         return 0;
6880
6881 err_flowtable_update_hook:
6882         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6883                 if (unregister)
6884                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6885                 list_del_rcu(&hook->list);
6886                 kfree_rcu(hook, rcu);
6887         }
6888
6889         return err;
6890
6891 }
6892
6893 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6894                                   struct sk_buff *skb,
6895                                   const struct nlmsghdr *nlh,
6896                                   const struct nlattr * const nla[],
6897                                   struct netlink_ext_ack *extack)
6898 {
6899         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6900         struct nft_flowtable_hook flowtable_hook;
6901         const struct nf_flowtable_type *type;
6902         u8 genmask = nft_genmask_next(net);
6903         int family = nfmsg->nfgen_family;
6904         struct nft_flowtable *flowtable;
6905         struct nft_hook *hook, *next;
6906         struct nft_table *table;
6907         struct nft_ctx ctx;
6908         int err;
6909
6910         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6911             !nla[NFTA_FLOWTABLE_NAME] ||
6912             !nla[NFTA_FLOWTABLE_HOOK])
6913                 return -EINVAL;
6914
6915         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6916                                  genmask, NETLINK_CB(skb).portid);
6917         if (IS_ERR(table)) {
6918                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6919                 return PTR_ERR(table);
6920         }
6921
6922         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6923                                          genmask);
6924         if (IS_ERR(flowtable)) {
6925                 err = PTR_ERR(flowtable);
6926                 if (err != -ENOENT) {
6927                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6928                         return err;
6929                 }
6930         } else {
6931                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6932                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6933                         return -EEXIST;
6934                 }
6935
6936                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6937
6938                 return nft_flowtable_update(&ctx, nlh, flowtable);
6939         }
6940
6941         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6942
6943         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6944         if (!flowtable)
6945                 return -ENOMEM;
6946
6947         flowtable->table = table;
6948         flowtable->handle = nf_tables_alloc_handle(table);
6949         INIT_LIST_HEAD(&flowtable->hook_list);
6950
6951         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6952         if (!flowtable->name) {
6953                 err = -ENOMEM;
6954                 goto err1;
6955         }
6956
6957         type = nft_flowtable_type_get(net, family);
6958         if (IS_ERR(type)) {
6959                 err = PTR_ERR(type);
6960                 goto err2;
6961         }
6962
6963         if (nla[NFTA_FLOWTABLE_FLAGS]) {
6964                 flowtable->data.flags =
6965                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6966                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK)
6967                         goto err3;
6968         }
6969
6970         write_pnet(&flowtable->data.net, net);
6971         flowtable->data.type = type;
6972         err = type->init(&flowtable->data);
6973         if (err < 0)
6974                 goto err3;
6975
6976         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6977                                        &flowtable_hook, flowtable, true);
6978         if (err < 0)
6979                 goto err4;
6980
6981         list_splice(&flowtable_hook.list, &flowtable->hook_list);
6982         flowtable->data.priority = flowtable_hook.priority;
6983         flowtable->hooknum = flowtable_hook.num;
6984
6985         err = nft_register_flowtable_net_hooks(ctx.net, table,
6986                                                &flowtable->hook_list,
6987                                                flowtable);
6988         if (err < 0) {
6989                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
6990                 goto err4;
6991         }
6992
6993         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6994         if (err < 0)
6995                 goto err5;
6996
6997         list_add_tail_rcu(&flowtable->list, &table->flowtables);
6998         table->use++;
6999
7000         return 0;
7001 err5:
7002         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7003                 nft_unregister_flowtable_hook(net, flowtable, hook);
7004                 list_del_rcu(&hook->list);
7005                 kfree_rcu(hook, rcu);
7006         }
7007 err4:
7008         flowtable->data.type->free(&flowtable->data);
7009 err3:
7010         module_put(type->owner);
7011 err2:
7012         kfree(flowtable->name);
7013 err1:
7014         kfree(flowtable);
7015         return err;
7016 }
7017
7018 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7019 {
7020         struct nft_hook *this, *next;
7021
7022         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7023                 list_del(&this->list);
7024                 kfree(this);
7025         }
7026 }
7027
7028 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7029                                  struct nft_flowtable *flowtable)
7030 {
7031         const struct nlattr * const *nla = ctx->nla;
7032         struct nft_flowtable_hook flowtable_hook;
7033         struct nft_hook *this, *hook;
7034         struct nft_trans *trans;
7035         int err;
7036
7037         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7038                                        &flowtable_hook, flowtable, false);
7039         if (err < 0)
7040                 return err;
7041
7042         list_for_each_entry(this, &flowtable_hook.list, list) {
7043                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7044                 if (!hook) {
7045                         err = -ENOENT;
7046                         goto err_flowtable_del_hook;
7047                 }
7048                 hook->inactive = true;
7049         }
7050
7051         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7052                                 sizeof(struct nft_trans_flowtable));
7053         if (!trans) {
7054                 err = -ENOMEM;
7055                 goto err_flowtable_del_hook;
7056         }
7057
7058         nft_trans_flowtable(trans) = flowtable;
7059         nft_trans_flowtable_update(trans) = true;
7060         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7061         nft_flowtable_hook_release(&flowtable_hook);
7062
7063         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
7064
7065         return 0;
7066
7067 err_flowtable_del_hook:
7068         list_for_each_entry(this, &flowtable_hook.list, list) {
7069                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7070                 if (!hook)
7071                         break;
7072
7073                 hook->inactive = false;
7074         }
7075         nft_flowtable_hook_release(&flowtable_hook);
7076
7077         return err;
7078 }
7079
7080 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
7081                                   struct sk_buff *skb,
7082                                   const struct nlmsghdr *nlh,
7083                                   const struct nlattr * const nla[],
7084                                   struct netlink_ext_ack *extack)
7085 {
7086         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7087         u8 genmask = nft_genmask_next(net);
7088         int family = nfmsg->nfgen_family;
7089         struct nft_flowtable *flowtable;
7090         const struct nlattr *attr;
7091         struct nft_table *table;
7092         struct nft_ctx ctx;
7093
7094         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7095             (!nla[NFTA_FLOWTABLE_NAME] &&
7096              !nla[NFTA_FLOWTABLE_HANDLE]))
7097                 return -EINVAL;
7098
7099         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7100                                  genmask, NETLINK_CB(skb).portid);
7101         if (IS_ERR(table)) {
7102                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7103                 return PTR_ERR(table);
7104         }
7105
7106         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7107                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7108                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7109         } else {
7110                 attr = nla[NFTA_FLOWTABLE_NAME];
7111                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7112         }
7113
7114         if (IS_ERR(flowtable)) {
7115                 NL_SET_BAD_ATTR(extack, attr);
7116                 return PTR_ERR(flowtable);
7117         }
7118
7119         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
7120
7121         if (nla[NFTA_FLOWTABLE_HOOK])
7122                 return nft_delflowtable_hook(&ctx, flowtable);
7123
7124         if (flowtable->use > 0) {
7125                 NL_SET_BAD_ATTR(extack, attr);
7126                 return -EBUSY;
7127         }
7128
7129         return nft_delflowtable(&ctx, flowtable);
7130 }
7131
7132 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7133                                          u32 portid, u32 seq, int event,
7134                                          u32 flags, int family,
7135                                          struct nft_flowtable *flowtable,
7136                                          struct list_head *hook_list)
7137 {
7138         struct nlattr *nest, *nest_devs;
7139         struct nfgenmsg *nfmsg;
7140         struct nft_hook *hook;
7141         struct nlmsghdr *nlh;
7142
7143         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7144         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
7145         if (nlh == NULL)
7146                 goto nla_put_failure;
7147
7148         nfmsg = nlmsg_data(nlh);
7149         nfmsg->nfgen_family     = family;
7150         nfmsg->version          = NFNETLINK_V0;
7151         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7152
7153         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7154             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7155             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7156             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7157                          NFTA_FLOWTABLE_PAD) ||
7158             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7159                 goto nla_put_failure;
7160
7161         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7162         if (!nest)
7163                 goto nla_put_failure;
7164         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7165             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7166                 goto nla_put_failure;
7167
7168         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7169         if (!nest_devs)
7170                 goto nla_put_failure;
7171
7172         list_for_each_entry_rcu(hook, hook_list, list) {
7173                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7174                         goto nla_put_failure;
7175         }
7176         nla_nest_end(skb, nest_devs);
7177         nla_nest_end(skb, nest);
7178
7179         nlmsg_end(skb, nlh);
7180         return 0;
7181
7182 nla_put_failure:
7183         nlmsg_trim(skb, nlh);
7184         return -1;
7185 }
7186
7187 struct nft_flowtable_filter {
7188         char            *table;
7189 };
7190
7191 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7192                                     struct netlink_callback *cb)
7193 {
7194         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7195         struct nft_flowtable_filter *filter = cb->data;
7196         unsigned int idx = 0, s_idx = cb->args[0];
7197         struct net *net = sock_net(skb->sk);
7198         int family = nfmsg->nfgen_family;
7199         struct nft_flowtable *flowtable;
7200         const struct nft_table *table;
7201
7202         rcu_read_lock();
7203         cb->seq = net->nft.base_seq;
7204
7205         list_for_each_entry_rcu(table, &net->nft.tables, list) {
7206                 if (family != NFPROTO_UNSPEC && family != table->family)
7207                         continue;
7208
7209                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7210                         if (!nft_is_active(net, flowtable))
7211                                 goto cont;
7212                         if (idx < s_idx)
7213                                 goto cont;
7214                         if (idx > s_idx)
7215                                 memset(&cb->args[1], 0,
7216                                        sizeof(cb->args) - sizeof(cb->args[0]));
7217                         if (filter && filter->table &&
7218                             strcmp(filter->table, table->name))
7219                                 goto cont;
7220
7221                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7222                                                           cb->nlh->nlmsg_seq,
7223                                                           NFT_MSG_NEWFLOWTABLE,
7224                                                           NLM_F_MULTI | NLM_F_APPEND,
7225                                                           table->family,
7226                                                           flowtable,
7227                                                           &flowtable->hook_list) < 0)
7228                                 goto done;
7229
7230                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7231 cont:
7232                         idx++;
7233                 }
7234         }
7235 done:
7236         rcu_read_unlock();
7237
7238         cb->args[0] = idx;
7239         return skb->len;
7240 }
7241
7242 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7243 {
7244         const struct nlattr * const *nla = cb->data;
7245         struct nft_flowtable_filter *filter = NULL;
7246
7247         if (nla[NFTA_FLOWTABLE_TABLE]) {
7248                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7249                 if (!filter)
7250                         return -ENOMEM;
7251
7252                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7253                                            GFP_ATOMIC);
7254                 if (!filter->table) {
7255                         kfree(filter);
7256                         return -ENOMEM;
7257                 }
7258         }
7259
7260         cb->data = filter;
7261         return 0;
7262 }
7263
7264 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7265 {
7266         struct nft_flowtable_filter *filter = cb->data;
7267
7268         if (!filter)
7269                 return 0;
7270
7271         kfree(filter->table);
7272         kfree(filter);
7273
7274         return 0;
7275 }
7276
7277 /* called with rcu_read_lock held */
7278 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
7279                                   struct sk_buff *skb,
7280                                   const struct nlmsghdr *nlh,
7281                                   const struct nlattr * const nla[],
7282                                   struct netlink_ext_ack *extack)
7283 {
7284         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7285         u8 genmask = nft_genmask_cur(net);
7286         int family = nfmsg->nfgen_family;
7287         struct nft_flowtable *flowtable;
7288         const struct nft_table *table;
7289         struct sk_buff *skb2;
7290         int err;
7291
7292         if (nlh->nlmsg_flags & NLM_F_DUMP) {
7293                 struct netlink_dump_control c = {
7294                         .start = nf_tables_dump_flowtable_start,
7295                         .dump = nf_tables_dump_flowtable,
7296                         .done = nf_tables_dump_flowtable_done,
7297                         .module = THIS_MODULE,
7298                         .data = (void *)nla,
7299                 };
7300
7301                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
7302         }
7303
7304         if (!nla[NFTA_FLOWTABLE_NAME])
7305                 return -EINVAL;
7306
7307         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7308                                  genmask, 0);
7309         if (IS_ERR(table))
7310                 return PTR_ERR(table);
7311
7312         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7313                                          genmask);
7314         if (IS_ERR(flowtable))
7315                 return PTR_ERR(flowtable);
7316
7317         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7318         if (!skb2)
7319                 return -ENOMEM;
7320
7321         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7322                                             nlh->nlmsg_seq,
7323                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7324                                             flowtable, &flowtable->hook_list);
7325         if (err < 0)
7326                 goto err_fill_flowtable_info;
7327
7328         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7329
7330 err_fill_flowtable_info:
7331         kfree_skb(skb2);
7332         return err;
7333 }
7334
7335 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7336                                        struct nft_flowtable *flowtable,
7337                                        struct list_head *hook_list,
7338                                        int event)
7339 {
7340         struct sk_buff *skb;
7341         int err;
7342         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7343                               flowtable->table->name, flowtable->table->handle,
7344                               flowtable->name, flowtable->handle);
7345
7346         audit_log_nfcfg(buf,
7347                         ctx->family,
7348                         flowtable->hooknum,
7349                         event == NFT_MSG_NEWFLOWTABLE ?
7350                                 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
7351                                 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7352                         GFP_KERNEL);
7353         kfree(buf);
7354
7355         if (!ctx->report &&
7356             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7357                 return;
7358
7359         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7360         if (skb == NULL)
7361                 goto err;
7362
7363         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7364                                             ctx->seq, event, 0,
7365                                             ctx->family, flowtable, hook_list);
7366         if (err < 0) {
7367                 kfree_skb(skb);
7368                 goto err;
7369         }
7370
7371         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
7372         return;
7373 err:
7374         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7375 }
7376
7377 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7378 {
7379         struct nft_hook *hook, *next;
7380
7381         flowtable->data.type->free(&flowtable->data);
7382         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7383                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7384                                             FLOW_BLOCK_UNBIND);
7385                 list_del_rcu(&hook->list);
7386                 kfree(hook);
7387         }
7388         kfree(flowtable->name);
7389         module_put(flowtable->data.type->owner);
7390         kfree(flowtable);
7391 }
7392
7393 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7394                                    u32 portid, u32 seq)
7395 {
7396         struct nlmsghdr *nlh;
7397         struct nfgenmsg *nfmsg;
7398         char buf[TASK_COMM_LEN];
7399         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7400
7401         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7402         if (nlh == NULL)
7403                 goto nla_put_failure;
7404
7405         nfmsg = nlmsg_data(nlh);
7406         nfmsg->nfgen_family     = AF_UNSPEC;
7407         nfmsg->version          = NFNETLINK_V0;
7408         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7409
7410         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7411             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7412             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7413                 goto nla_put_failure;
7414
7415         nlmsg_end(skb, nlh);
7416         return 0;
7417
7418 nla_put_failure:
7419         nlmsg_trim(skb, nlh);
7420         return -EMSGSIZE;
7421 }
7422
7423 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7424                                 struct nft_flowtable *flowtable)
7425 {
7426         struct nft_hook *hook;
7427
7428         list_for_each_entry(hook, &flowtable->hook_list, list) {
7429                 if (hook->ops.dev != dev)
7430                         continue;
7431
7432                 /* flow_offload_netdev_event() cleans up entries for us. */
7433                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7434                 list_del_rcu(&hook->list);
7435                 kfree_rcu(hook, rcu);
7436                 break;
7437         }
7438 }
7439
7440 static int nf_tables_flowtable_event(struct notifier_block *this,
7441                                      unsigned long event, void *ptr)
7442 {
7443         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7444         struct nft_flowtable *flowtable;
7445         struct nft_table *table;
7446         struct net *net;
7447
7448         if (event != NETDEV_UNREGISTER)
7449                 return 0;
7450
7451         net = dev_net(dev);
7452         mutex_lock(&net->nft.commit_mutex);
7453         list_for_each_entry(table, &net->nft.tables, list) {
7454                 list_for_each_entry(flowtable, &table->flowtables, list) {
7455                         nft_flowtable_event(event, dev, flowtable);
7456                 }
7457         }
7458         mutex_unlock(&net->nft.commit_mutex);
7459
7460         return NOTIFY_DONE;
7461 }
7462
7463 static struct notifier_block nf_tables_flowtable_notifier = {
7464         .notifier_call  = nf_tables_flowtable_event,
7465 };
7466
7467 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7468                                  int event)
7469 {
7470         struct nlmsghdr *nlh = nlmsg_hdr(skb);
7471         struct sk_buff *skb2;
7472         int err;
7473
7474         audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
7475                         AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
7476
7477         if (!nlmsg_report(nlh) &&
7478             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7479                 return;
7480
7481         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7482         if (skb2 == NULL)
7483                 goto err;
7484
7485         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7486                                       nlh->nlmsg_seq);
7487         if (err < 0) {
7488                 kfree_skb(skb2);
7489                 goto err;
7490         }
7491
7492         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7493                        nlmsg_report(nlh), GFP_KERNEL);
7494         return;
7495 err:
7496         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7497                           -ENOBUFS);
7498 }
7499
7500 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7501                             struct sk_buff *skb, const struct nlmsghdr *nlh,
7502                             const struct nlattr * const nla[],
7503                             struct netlink_ext_ack *extack)
7504 {
7505         struct sk_buff *skb2;
7506         int err;
7507
7508         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7509         if (skb2 == NULL)
7510                 return -ENOMEM;
7511
7512         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7513                                       nlh->nlmsg_seq);
7514         if (err < 0)
7515                 goto err_fill_gen_info;
7516
7517         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7518
7519 err_fill_gen_info:
7520         kfree_skb(skb2);
7521         return err;
7522 }
7523
7524 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7525         [NFT_MSG_NEWTABLE] = {
7526                 .call_batch     = nf_tables_newtable,
7527                 .attr_count     = NFTA_TABLE_MAX,
7528                 .policy         = nft_table_policy,
7529         },
7530         [NFT_MSG_GETTABLE] = {
7531                 .call_rcu       = nf_tables_gettable,
7532                 .attr_count     = NFTA_TABLE_MAX,
7533                 .policy         = nft_table_policy,
7534         },
7535         [NFT_MSG_DELTABLE] = {
7536                 .call_batch     = nf_tables_deltable,
7537                 .attr_count     = NFTA_TABLE_MAX,
7538                 .policy         = nft_table_policy,
7539         },
7540         [NFT_MSG_NEWCHAIN] = {
7541                 .call_batch     = nf_tables_newchain,
7542                 .attr_count     = NFTA_CHAIN_MAX,
7543                 .policy         = nft_chain_policy,
7544         },
7545         [NFT_MSG_GETCHAIN] = {
7546                 .call_rcu       = nf_tables_getchain,
7547                 .attr_count     = NFTA_CHAIN_MAX,
7548                 .policy         = nft_chain_policy,
7549         },
7550         [NFT_MSG_DELCHAIN] = {
7551                 .call_batch     = nf_tables_delchain,
7552                 .attr_count     = NFTA_CHAIN_MAX,
7553                 .policy         = nft_chain_policy,
7554         },
7555         [NFT_MSG_NEWRULE] = {
7556                 .call_batch     = nf_tables_newrule,
7557                 .attr_count     = NFTA_RULE_MAX,
7558                 .policy         = nft_rule_policy,
7559         },
7560         [NFT_MSG_GETRULE] = {
7561                 .call_rcu       = nf_tables_getrule,
7562                 .attr_count     = NFTA_RULE_MAX,
7563                 .policy         = nft_rule_policy,
7564         },
7565         [NFT_MSG_DELRULE] = {
7566                 .call_batch     = nf_tables_delrule,
7567                 .attr_count     = NFTA_RULE_MAX,
7568                 .policy         = nft_rule_policy,
7569         },
7570         [NFT_MSG_NEWSET] = {
7571                 .call_batch     = nf_tables_newset,
7572                 .attr_count     = NFTA_SET_MAX,
7573                 .policy         = nft_set_policy,
7574         },
7575         [NFT_MSG_GETSET] = {
7576                 .call_rcu       = nf_tables_getset,
7577                 .attr_count     = NFTA_SET_MAX,
7578                 .policy         = nft_set_policy,
7579         },
7580         [NFT_MSG_DELSET] = {
7581                 .call_batch     = nf_tables_delset,
7582                 .attr_count     = NFTA_SET_MAX,
7583                 .policy         = nft_set_policy,
7584         },
7585         [NFT_MSG_NEWSETELEM] = {
7586                 .call_batch     = nf_tables_newsetelem,
7587                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7588                 .policy         = nft_set_elem_list_policy,
7589         },
7590         [NFT_MSG_GETSETELEM] = {
7591                 .call_rcu       = nf_tables_getsetelem,
7592                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7593                 .policy         = nft_set_elem_list_policy,
7594         },
7595         [NFT_MSG_DELSETELEM] = {
7596                 .call_batch     = nf_tables_delsetelem,
7597                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7598                 .policy         = nft_set_elem_list_policy,
7599         },
7600         [NFT_MSG_GETGEN] = {
7601                 .call_rcu       = nf_tables_getgen,
7602         },
7603         [NFT_MSG_NEWOBJ] = {
7604                 .call_batch     = nf_tables_newobj,
7605                 .attr_count     = NFTA_OBJ_MAX,
7606                 .policy         = nft_obj_policy,
7607         },
7608         [NFT_MSG_GETOBJ] = {
7609                 .call_rcu       = nf_tables_getobj,
7610                 .attr_count     = NFTA_OBJ_MAX,
7611                 .policy         = nft_obj_policy,
7612         },
7613         [NFT_MSG_DELOBJ] = {
7614                 .call_batch     = nf_tables_delobj,
7615                 .attr_count     = NFTA_OBJ_MAX,
7616                 .policy         = nft_obj_policy,
7617         },
7618         [NFT_MSG_GETOBJ_RESET] = {
7619                 .call_rcu       = nf_tables_getobj,
7620                 .attr_count     = NFTA_OBJ_MAX,
7621                 .policy         = nft_obj_policy,
7622         },
7623         [NFT_MSG_NEWFLOWTABLE] = {
7624                 .call_batch     = nf_tables_newflowtable,
7625                 .attr_count     = NFTA_FLOWTABLE_MAX,
7626                 .policy         = nft_flowtable_policy,
7627         },
7628         [NFT_MSG_GETFLOWTABLE] = {
7629                 .call_rcu       = nf_tables_getflowtable,
7630                 .attr_count     = NFTA_FLOWTABLE_MAX,
7631                 .policy         = nft_flowtable_policy,
7632         },
7633         [NFT_MSG_DELFLOWTABLE] = {
7634                 .call_batch     = nf_tables_delflowtable,
7635                 .attr_count     = NFTA_FLOWTABLE_MAX,
7636                 .policy         = nft_flowtable_policy,
7637         },
7638 };
7639
7640 static int nf_tables_validate(struct net *net)
7641 {
7642         struct nft_table *table;
7643
7644         switch (net->nft.validate_state) {
7645         case NFT_VALIDATE_SKIP:
7646                 break;
7647         case NFT_VALIDATE_NEED:
7648                 nft_validate_state_update(net, NFT_VALIDATE_DO);
7649                 fallthrough;
7650         case NFT_VALIDATE_DO:
7651                 list_for_each_entry(table, &net->nft.tables, list) {
7652                         if (nft_table_validate(net, table) < 0)
7653                                 return -EAGAIN;
7654                 }
7655                 break;
7656         }
7657
7658         return 0;
7659 }
7660
7661 /* a drop policy has to be deferred until all rules have been activated,
7662  * otherwise a large ruleset that contains a drop-policy base chain will
7663  * cause all packets to get dropped until the full transaction has been
7664  * processed.
7665  *
7666  * We defer the drop policy until the transaction has been finalized.
7667  */
7668 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7669 {
7670         struct nft_base_chain *basechain;
7671
7672         if (nft_trans_chain_policy(trans) != NF_DROP)
7673                 return;
7674
7675         if (!nft_is_base_chain(trans->ctx.chain))
7676                 return;
7677
7678         basechain = nft_base_chain(trans->ctx.chain);
7679         basechain->policy = NF_DROP;
7680 }
7681
7682 static void nft_chain_commit_update(struct nft_trans *trans)
7683 {
7684         struct nft_base_chain *basechain;
7685
7686         if (nft_trans_chain_name(trans)) {
7687                 rhltable_remove(&trans->ctx.table->chains_ht,
7688                                 &trans->ctx.chain->rhlhead,
7689                                 nft_chain_ht_params);
7690                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
7691                 rhltable_insert_key(&trans->ctx.table->chains_ht,
7692                                     trans->ctx.chain->name,
7693                                     &trans->ctx.chain->rhlhead,
7694                                     nft_chain_ht_params);
7695         }
7696
7697         if (!nft_is_base_chain(trans->ctx.chain))
7698                 return;
7699
7700         nft_chain_stats_replace(trans);
7701
7702         basechain = nft_base_chain(trans->ctx.chain);
7703
7704         switch (nft_trans_chain_policy(trans)) {
7705         case NF_DROP:
7706         case NF_ACCEPT:
7707                 basechain->policy = nft_trans_chain_policy(trans);
7708                 break;
7709         }
7710 }
7711
7712 static void nft_obj_commit_update(struct nft_trans *trans)
7713 {
7714         struct nft_object *newobj;
7715         struct nft_object *obj;
7716
7717         obj = nft_trans_obj(trans);
7718         newobj = nft_trans_obj_newobj(trans);
7719
7720         if (obj->ops->update)
7721                 obj->ops->update(obj, newobj);
7722
7723         kfree(newobj);
7724 }
7725
7726 static void nft_commit_release(struct nft_trans *trans)
7727 {
7728         switch (trans->msg_type) {
7729         case NFT_MSG_DELTABLE:
7730                 nf_tables_table_destroy(&trans->ctx);
7731                 break;
7732         case NFT_MSG_NEWCHAIN:
7733                 free_percpu(nft_trans_chain_stats(trans));
7734                 kfree(nft_trans_chain_name(trans));
7735                 break;
7736         case NFT_MSG_DELCHAIN:
7737                 nf_tables_chain_destroy(&trans->ctx);
7738                 break;
7739         case NFT_MSG_DELRULE:
7740                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7741                 break;
7742         case NFT_MSG_DELSET:
7743                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7744                 break;
7745         case NFT_MSG_DELSETELEM:
7746                 nf_tables_set_elem_destroy(&trans->ctx,
7747                                            nft_trans_elem_set(trans),
7748                                            nft_trans_elem(trans).priv);
7749                 break;
7750         case NFT_MSG_DELOBJ:
7751                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7752                 break;
7753         case NFT_MSG_DELFLOWTABLE:
7754                 if (nft_trans_flowtable_update(trans))
7755                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7756                 else
7757                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7758                 break;
7759         }
7760
7761         if (trans->put_net)
7762                 put_net(trans->ctx.net);
7763
7764         kfree(trans);
7765 }
7766
7767 static void nf_tables_trans_destroy_work(struct work_struct *w)
7768 {
7769         struct nft_trans *trans, *next;
7770         LIST_HEAD(head);
7771
7772         spin_lock(&nf_tables_destroy_list_lock);
7773         list_splice_init(&nf_tables_destroy_list, &head);
7774         spin_unlock(&nf_tables_destroy_list_lock);
7775
7776         if (list_empty(&head))
7777                 return;
7778
7779         synchronize_rcu();
7780
7781         list_for_each_entry_safe(trans, next, &head, list) {
7782                 list_del(&trans->list);
7783                 nft_commit_release(trans);
7784         }
7785 }
7786
7787 void nf_tables_trans_destroy_flush_work(void)
7788 {
7789         flush_work(&trans_destroy_work);
7790 }
7791 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7792
7793 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7794 {
7795         struct nft_rule *rule;
7796         unsigned int alloc = 0;
7797         int i;
7798
7799         /* already handled or inactive chain? */
7800         if (chain->rules_next || !nft_is_active_next(net, chain))
7801                 return 0;
7802
7803         rule = list_entry(&chain->rules, struct nft_rule, list);
7804         i = 0;
7805
7806         list_for_each_entry_continue(rule, &chain->rules, list) {
7807                 if (nft_is_active_next(net, rule))
7808                         alloc++;
7809         }
7810
7811         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7812         if (!chain->rules_next)
7813                 return -ENOMEM;
7814
7815         list_for_each_entry_continue(rule, &chain->rules, list) {
7816                 if (nft_is_active_next(net, rule))
7817                         chain->rules_next[i++] = rule;
7818         }
7819
7820         chain->rules_next[i] = NULL;
7821         return 0;
7822 }
7823
7824 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7825 {
7826         struct nft_trans *trans, *next;
7827
7828         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7829                 struct nft_chain *chain = trans->ctx.chain;
7830
7831                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7832                     trans->msg_type == NFT_MSG_DELRULE) {
7833                         kvfree(chain->rules_next);
7834                         chain->rules_next = NULL;
7835                 }
7836         }
7837 }
7838
7839 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7840 {
7841         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7842
7843         kvfree(o->start);
7844 }
7845
7846 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7847 {
7848         struct nft_rule **r = rules;
7849         struct nft_rules_old *old;
7850
7851         while (*r)
7852                 r++;
7853
7854         r++;    /* rcu_head is after end marker */
7855         old = (void *) r;
7856         old->start = rules;
7857
7858         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7859 }
7860
7861 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7862 {
7863         struct nft_rule **g0, **g1;
7864         bool next_genbit;
7865
7866         next_genbit = nft_gencursor_next(net);
7867
7868         g0 = rcu_dereference_protected(chain->rules_gen_0,
7869                                        lockdep_commit_lock_is_held(net));
7870         g1 = rcu_dereference_protected(chain->rules_gen_1,
7871                                        lockdep_commit_lock_is_held(net));
7872
7873         /* No changes to this chain? */
7874         if (chain->rules_next == NULL) {
7875                 /* chain had no change in last or next generation */
7876                 if (g0 == g1)
7877                         return;
7878                 /*
7879                  * chain had no change in this generation; make sure next
7880                  * one uses same rules as current generation.
7881                  */
7882                 if (next_genbit) {
7883                         rcu_assign_pointer(chain->rules_gen_1, g0);
7884                         nf_tables_commit_chain_free_rules_old(g1);
7885                 } else {
7886                         rcu_assign_pointer(chain->rules_gen_0, g1);
7887                         nf_tables_commit_chain_free_rules_old(g0);
7888                 }
7889
7890                 return;
7891         }
7892
7893         if (next_genbit)
7894                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7895         else
7896                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7897
7898         chain->rules_next = NULL;
7899
7900         if (g0 == g1)
7901                 return;
7902
7903         if (next_genbit)
7904                 nf_tables_commit_chain_free_rules_old(g1);
7905         else
7906                 nf_tables_commit_chain_free_rules_old(g0);
7907 }
7908
7909 static void nft_obj_del(struct nft_object *obj)
7910 {
7911         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7912         list_del_rcu(&obj->list);
7913 }
7914
7915 void nft_chain_del(struct nft_chain *chain)
7916 {
7917         struct nft_table *table = chain->table;
7918
7919         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7920                                      nft_chain_ht_params));
7921         list_del_rcu(&chain->list);
7922 }
7923
7924 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7925                                     struct list_head *hook_list)
7926 {
7927         struct nft_hook *hook, *next;
7928
7929         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7930                 if (hook->inactive)
7931                         list_move(&hook->list, hook_list);
7932         }
7933 }
7934
7935 static void nf_tables_module_autoload_cleanup(struct net *net)
7936 {
7937         struct nft_module_request *req, *next;
7938
7939         WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7940         list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7941                 WARN_ON_ONCE(!req->done);
7942                 list_del(&req->list);
7943                 kfree(req);
7944         }
7945 }
7946
7947 static void nf_tables_commit_release(struct net *net)
7948 {
7949         struct nft_trans *trans;
7950
7951         /* all side effects have to be made visible.
7952          * For example, if a chain named 'foo' has been deleted, a
7953          * new transaction must not find it anymore.
7954          *
7955          * Memory reclaim happens asynchronously from work queue
7956          * to prevent expensive synchronize_rcu() in commit phase.
7957          */
7958         if (list_empty(&net->nft.commit_list)) {
7959                 nf_tables_module_autoload_cleanup(net);
7960                 mutex_unlock(&net->nft.commit_mutex);
7961                 return;
7962         }
7963
7964         trans = list_last_entry(&net->nft.commit_list,
7965                                 struct nft_trans, list);
7966         get_net(trans->ctx.net);
7967         WARN_ON_ONCE(trans->put_net);
7968
7969         trans->put_net = true;
7970         spin_lock(&nf_tables_destroy_list_lock);
7971         list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7972         spin_unlock(&nf_tables_destroy_list_lock);
7973
7974         nf_tables_module_autoload_cleanup(net);
7975         schedule_work(&trans_destroy_work);
7976
7977         mutex_unlock(&net->nft.commit_mutex);
7978 }
7979
7980 static void nft_commit_notify(struct net *net, u32 portid)
7981 {
7982         struct sk_buff *batch_skb = NULL, *nskb, *skb;
7983         unsigned char *data;
7984         int len;
7985
7986         list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) {
7987                 if (!batch_skb) {
7988 new_batch:
7989                         batch_skb = skb;
7990                         len = NLMSG_GOODSIZE - skb->len;
7991                         list_del(&skb->list);
7992                         continue;
7993                 }
7994                 len -= skb->len;
7995                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
7996                         data = skb_put(batch_skb, skb->len);
7997                         memcpy(data, skb->data, skb->len);
7998                         list_del(&skb->list);
7999                         kfree_skb(skb);
8000                         continue;
8001                 }
8002                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8003                                NFT_CB(batch_skb).report, GFP_KERNEL);
8004                 goto new_batch;
8005         }
8006
8007         if (batch_skb) {
8008                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8009                                NFT_CB(batch_skb).report, GFP_KERNEL);
8010         }
8011
8012         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
8013 }
8014
8015 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8016 {
8017         struct nft_trans *trans, *next;
8018         struct nft_trans_elem *te;
8019         struct nft_chain *chain;
8020         struct nft_table *table;
8021         int err;
8022
8023         if (list_empty(&net->nft.commit_list)) {
8024                 mutex_unlock(&net->nft.commit_mutex);
8025                 return 0;
8026         }
8027
8028         /* 0. Validate ruleset, otherwise roll back for error reporting. */
8029         if (nf_tables_validate(net) < 0)
8030                 return -EAGAIN;
8031
8032         err = nft_flow_rule_offload_commit(net);
8033         if (err < 0)
8034                 return err;
8035
8036         /* 1.  Allocate space for next generation rules_gen_X[] */
8037         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
8038                 int ret;
8039
8040                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8041                     trans->msg_type == NFT_MSG_DELRULE) {
8042                         chain = trans->ctx.chain;
8043
8044                         ret = nf_tables_commit_chain_prepare(net, chain);
8045                         if (ret < 0) {
8046                                 nf_tables_commit_chain_prepare_cancel(net);
8047                                 return ret;
8048                         }
8049                 }
8050         }
8051
8052         /* step 2.  Make rules_gen_X visible to packet path */
8053         list_for_each_entry(table, &net->nft.tables, list) {
8054                 list_for_each_entry(chain, &table->chains, list)
8055                         nf_tables_commit_chain(net, chain);
8056         }
8057
8058         /*
8059          * Bump generation counter, invalidate any dump in progress.
8060          * Cannot fail after this point.
8061          */
8062         while (++net->nft.base_seq == 0);
8063
8064         /* step 3. Start new generation, rules_gen_X now in use. */
8065         net->nft.gencursor = nft_gencursor_next(net);
8066
8067         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
8068                 switch (trans->msg_type) {
8069                 case NFT_MSG_NEWTABLE:
8070                         if (nft_trans_table_update(trans)) {
8071                                 if (!nft_trans_table_enable(trans)) {
8072                                         nf_tables_table_disable(net,
8073                                                                 trans->ctx.table);
8074                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8075                                 }
8076                         } else {
8077                                 nft_clear(net, trans->ctx.table);
8078                         }
8079                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8080                         nft_trans_destroy(trans);
8081                         break;
8082                 case NFT_MSG_DELTABLE:
8083                         list_del_rcu(&trans->ctx.table->list);
8084                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8085                         break;
8086                 case NFT_MSG_NEWCHAIN:
8087                         if (nft_trans_chain_update(trans)) {
8088                                 nft_chain_commit_update(trans);
8089                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8090                                 /* trans destroyed after rcu grace period */
8091                         } else {
8092                                 nft_chain_commit_drop_policy(trans);
8093                                 nft_clear(net, trans->ctx.chain);
8094                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8095                                 nft_trans_destroy(trans);
8096                         }
8097                         break;
8098                 case NFT_MSG_DELCHAIN:
8099                         nft_chain_del(trans->ctx.chain);
8100                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8101                         nf_tables_unregister_hook(trans->ctx.net,
8102                                                   trans->ctx.table,
8103                                                   trans->ctx.chain);
8104                         break;
8105                 case NFT_MSG_NEWRULE:
8106                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8107                         nf_tables_rule_notify(&trans->ctx,
8108                                               nft_trans_rule(trans),
8109                                               NFT_MSG_NEWRULE);
8110                         nft_trans_destroy(trans);
8111                         break;
8112                 case NFT_MSG_DELRULE:
8113                         list_del_rcu(&nft_trans_rule(trans)->list);
8114                         nf_tables_rule_notify(&trans->ctx,
8115                                               nft_trans_rule(trans),
8116                                               NFT_MSG_DELRULE);
8117                         nft_rule_expr_deactivate(&trans->ctx,
8118                                                  nft_trans_rule(trans),
8119                                                  NFT_TRANS_COMMIT);
8120                         break;
8121                 case NFT_MSG_NEWSET:
8122                         nft_clear(net, nft_trans_set(trans));
8123                         /* This avoids hitting -EBUSY when deleting the table
8124                          * from the transaction.
8125                          */
8126                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8127                             !list_empty(&nft_trans_set(trans)->bindings))
8128                                 trans->ctx.table->use--;
8129
8130                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8131                                              NFT_MSG_NEWSET, GFP_KERNEL);
8132                         nft_trans_destroy(trans);
8133                         break;
8134                 case NFT_MSG_DELSET:
8135                         list_del_rcu(&nft_trans_set(trans)->list);
8136                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8137                                              NFT_MSG_DELSET, GFP_KERNEL);
8138                         break;
8139                 case NFT_MSG_NEWSETELEM:
8140                         te = (struct nft_trans_elem *)trans->data;
8141
8142                         te->set->ops->activate(net, te->set, &te->elem);
8143                         nf_tables_setelem_notify(&trans->ctx, te->set,
8144                                                  &te->elem,
8145                                                  NFT_MSG_NEWSETELEM, 0);
8146                         nft_trans_destroy(trans);
8147                         break;
8148                 case NFT_MSG_DELSETELEM:
8149                         te = (struct nft_trans_elem *)trans->data;
8150
8151                         nf_tables_setelem_notify(&trans->ctx, te->set,
8152                                                  &te->elem,
8153                                                  NFT_MSG_DELSETELEM, 0);
8154                         te->set->ops->remove(net, te->set, &te->elem);
8155                         atomic_dec(&te->set->nelems);
8156                         te->set->ndeact--;
8157                         break;
8158                 case NFT_MSG_NEWOBJ:
8159                         if (nft_trans_obj_update(trans)) {
8160                                 nft_obj_commit_update(trans);
8161                                 nf_tables_obj_notify(&trans->ctx,
8162                                                      nft_trans_obj(trans),
8163                                                      NFT_MSG_NEWOBJ);
8164                         } else {
8165                                 nft_clear(net, nft_trans_obj(trans));
8166                                 nf_tables_obj_notify(&trans->ctx,
8167                                                      nft_trans_obj(trans),
8168                                                      NFT_MSG_NEWOBJ);
8169                                 nft_trans_destroy(trans);
8170                         }
8171                         break;
8172                 case NFT_MSG_DELOBJ:
8173                         nft_obj_del(nft_trans_obj(trans));
8174                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8175                                              NFT_MSG_DELOBJ);
8176                         break;
8177                 case NFT_MSG_NEWFLOWTABLE:
8178                         if (nft_trans_flowtable_update(trans)) {
8179                                 nf_tables_flowtable_notify(&trans->ctx,
8180                                                            nft_trans_flowtable(trans),
8181                                                            &nft_trans_flowtable_hooks(trans),
8182                                                            NFT_MSG_NEWFLOWTABLE);
8183                                 list_splice(&nft_trans_flowtable_hooks(trans),
8184                                             &nft_trans_flowtable(trans)->hook_list);
8185                         } else {
8186                                 nft_clear(net, nft_trans_flowtable(trans));
8187                                 nf_tables_flowtable_notify(&trans->ctx,
8188                                                            nft_trans_flowtable(trans),
8189                                                            &nft_trans_flowtable(trans)->hook_list,
8190                                                            NFT_MSG_NEWFLOWTABLE);
8191                         }
8192                         nft_trans_destroy(trans);
8193                         break;
8194                 case NFT_MSG_DELFLOWTABLE:
8195                         if (nft_trans_flowtable_update(trans)) {
8196                                 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8197                                                         &nft_trans_flowtable_hooks(trans));
8198                                 nf_tables_flowtable_notify(&trans->ctx,
8199                                                            nft_trans_flowtable(trans),
8200                                                            &nft_trans_flowtable_hooks(trans),
8201                                                            NFT_MSG_DELFLOWTABLE);
8202                                 nft_unregister_flowtable_net_hooks(net,
8203                                                                    &nft_trans_flowtable_hooks(trans));
8204                         } else {
8205                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8206                                 nf_tables_flowtable_notify(&trans->ctx,
8207                                                            nft_trans_flowtable(trans),
8208                                                            &nft_trans_flowtable(trans)->hook_list,
8209                                                            NFT_MSG_DELFLOWTABLE);
8210                                 nft_unregister_flowtable_net_hooks(net,
8211                                                 &nft_trans_flowtable(trans)->hook_list);
8212                         }
8213                         break;
8214                 }
8215         }
8216
8217         nft_commit_notify(net, NETLINK_CB(skb).portid);
8218         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8219         nf_tables_commit_release(net);
8220
8221         return 0;
8222 }
8223
8224 static void nf_tables_module_autoload(struct net *net)
8225 {
8226         struct nft_module_request *req, *next;
8227         LIST_HEAD(module_list);
8228
8229         list_splice_init(&net->nft.module_list, &module_list);
8230         mutex_unlock(&net->nft.commit_mutex);
8231         list_for_each_entry_safe(req, next, &module_list, list) {
8232                 request_module("%s", req->module);
8233                 req->done = true;
8234         }
8235         mutex_lock(&net->nft.commit_mutex);
8236         list_splice(&module_list, &net->nft.module_list);
8237 }
8238
8239 static void nf_tables_abort_release(struct nft_trans *trans)
8240 {
8241         switch (trans->msg_type) {
8242         case NFT_MSG_NEWTABLE:
8243                 nf_tables_table_destroy(&trans->ctx);
8244                 break;
8245         case NFT_MSG_NEWCHAIN:
8246                 nf_tables_chain_destroy(&trans->ctx);
8247                 break;
8248         case NFT_MSG_NEWRULE:
8249                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8250                 break;
8251         case NFT_MSG_NEWSET:
8252                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8253                 break;
8254         case NFT_MSG_NEWSETELEM:
8255                 nft_set_elem_destroy(nft_trans_elem_set(trans),
8256                                      nft_trans_elem(trans).priv, true);
8257                 break;
8258         case NFT_MSG_NEWOBJ:
8259                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8260                 break;
8261         case NFT_MSG_NEWFLOWTABLE:
8262                 if (nft_trans_flowtable_update(trans))
8263                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8264                 else
8265                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8266                 break;
8267         }
8268         kfree(trans);
8269 }
8270
8271 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8272 {
8273         struct nft_trans *trans, *next;
8274         struct nft_trans_elem *te;
8275         struct nft_hook *hook;
8276
8277         if (action == NFNL_ABORT_VALIDATE &&
8278             nf_tables_validate(net) < 0)
8279                 return -EAGAIN;
8280
8281         list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
8282                                          list) {
8283                 switch (trans->msg_type) {
8284                 case NFT_MSG_NEWTABLE:
8285                         if (nft_trans_table_update(trans)) {
8286                                 if (nft_trans_table_enable(trans)) {
8287                                         nf_tables_table_disable(net,
8288                                                                 trans->ctx.table);
8289                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8290                                 }
8291                                 nft_trans_destroy(trans);
8292                         } else {
8293                                 list_del_rcu(&trans->ctx.table->list);
8294                         }
8295                         break;
8296                 case NFT_MSG_DELTABLE:
8297                         nft_clear(trans->ctx.net, trans->ctx.table);
8298                         nft_trans_destroy(trans);
8299                         break;
8300                 case NFT_MSG_NEWCHAIN:
8301                         if (nft_trans_chain_update(trans)) {
8302                                 free_percpu(nft_trans_chain_stats(trans));
8303                                 kfree(nft_trans_chain_name(trans));
8304                                 nft_trans_destroy(trans);
8305                         } else {
8306                                 if (nft_chain_is_bound(trans->ctx.chain)) {
8307                                         nft_trans_destroy(trans);
8308                                         break;
8309                                 }
8310                                 trans->ctx.table->use--;
8311                                 nft_chain_del(trans->ctx.chain);
8312                                 nf_tables_unregister_hook(trans->ctx.net,
8313                                                           trans->ctx.table,
8314                                                           trans->ctx.chain);
8315                         }
8316                         break;
8317                 case NFT_MSG_DELCHAIN:
8318                         trans->ctx.table->use++;
8319                         nft_clear(trans->ctx.net, trans->ctx.chain);
8320                         nft_trans_destroy(trans);
8321                         break;
8322                 case NFT_MSG_NEWRULE:
8323                         trans->ctx.chain->use--;
8324                         list_del_rcu(&nft_trans_rule(trans)->list);
8325                         nft_rule_expr_deactivate(&trans->ctx,
8326                                                  nft_trans_rule(trans),
8327                                                  NFT_TRANS_ABORT);
8328                         break;
8329                 case NFT_MSG_DELRULE:
8330                         trans->ctx.chain->use++;
8331                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8332                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8333                         nft_trans_destroy(trans);
8334                         break;
8335                 case NFT_MSG_NEWSET:
8336                         trans->ctx.table->use--;
8337                         if (nft_trans_set_bound(trans)) {
8338                                 nft_trans_destroy(trans);
8339                                 break;
8340                         }
8341                         list_del_rcu(&nft_trans_set(trans)->list);
8342                         break;
8343                 case NFT_MSG_DELSET:
8344                         trans->ctx.table->use++;
8345                         nft_clear(trans->ctx.net, nft_trans_set(trans));
8346                         nft_trans_destroy(trans);
8347                         break;
8348                 case NFT_MSG_NEWSETELEM:
8349                         if (nft_trans_elem_set_bound(trans)) {
8350                                 nft_trans_destroy(trans);
8351                                 break;
8352                         }
8353                         te = (struct nft_trans_elem *)trans->data;
8354                         te->set->ops->remove(net, te->set, &te->elem);
8355                         atomic_dec(&te->set->nelems);
8356                         break;
8357                 case NFT_MSG_DELSETELEM:
8358                         te = (struct nft_trans_elem *)trans->data;
8359
8360                         nft_set_elem_activate(net, te->set, &te->elem);
8361                         te->set->ops->activate(net, te->set, &te->elem);
8362                         te->set->ndeact--;
8363
8364                         nft_trans_destroy(trans);
8365                         break;
8366                 case NFT_MSG_NEWOBJ:
8367                         if (nft_trans_obj_update(trans)) {
8368                                 kfree(nft_trans_obj_newobj(trans));
8369                                 nft_trans_destroy(trans);
8370                         } else {
8371                                 trans->ctx.table->use--;
8372                                 nft_obj_del(nft_trans_obj(trans));
8373                         }
8374                         break;
8375                 case NFT_MSG_DELOBJ:
8376                         trans->ctx.table->use++;
8377                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
8378                         nft_trans_destroy(trans);
8379                         break;
8380                 case NFT_MSG_NEWFLOWTABLE:
8381                         if (nft_trans_flowtable_update(trans)) {
8382                                 nft_unregister_flowtable_net_hooks(net,
8383                                                 &nft_trans_flowtable_hooks(trans));
8384                         } else {
8385                                 trans->ctx.table->use--;
8386                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8387                                 nft_unregister_flowtable_net_hooks(net,
8388                                                 &nft_trans_flowtable(trans)->hook_list);
8389                         }
8390                         break;
8391                 case NFT_MSG_DELFLOWTABLE:
8392                         if (nft_trans_flowtable_update(trans)) {
8393                                 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8394                                         hook->inactive = false;
8395                         } else {
8396                                 trans->ctx.table->use++;
8397                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8398                         }
8399                         nft_trans_destroy(trans);
8400                         break;
8401                 }
8402         }
8403
8404         synchronize_rcu();
8405
8406         list_for_each_entry_safe_reverse(trans, next,
8407                                          &net->nft.commit_list, list) {
8408                 list_del(&trans->list);
8409                 nf_tables_abort_release(trans);
8410         }
8411
8412         if (action == NFNL_ABORT_AUTOLOAD)
8413                 nf_tables_module_autoload(net);
8414         else
8415                 nf_tables_module_autoload_cleanup(net);
8416
8417         return 0;
8418 }
8419
8420 static void nf_tables_cleanup(struct net *net)
8421 {
8422         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8423 }
8424
8425 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8426                            enum nfnl_abort_action action)
8427 {
8428         int ret = __nf_tables_abort(net, action);
8429
8430         mutex_unlock(&net->nft.commit_mutex);
8431
8432         return ret;
8433 }
8434
8435 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8436 {
8437         bool genid_ok;
8438
8439         mutex_lock(&net->nft.commit_mutex);
8440
8441         genid_ok = genid == 0 || net->nft.base_seq == genid;
8442         if (!genid_ok)
8443                 mutex_unlock(&net->nft.commit_mutex);
8444
8445         /* else, commit mutex has to be released by commit or abort function */
8446         return genid_ok;
8447 }
8448
8449 static const struct nfnetlink_subsystem nf_tables_subsys = {
8450         .name           = "nf_tables",
8451         .subsys_id      = NFNL_SUBSYS_NFTABLES,
8452         .cb_count       = NFT_MSG_MAX,
8453         .cb             = nf_tables_cb,
8454         .commit         = nf_tables_commit,
8455         .abort          = nf_tables_abort,
8456         .cleanup        = nf_tables_cleanup,
8457         .valid_genid    = nf_tables_valid_genid,
8458         .owner          = THIS_MODULE,
8459 };
8460
8461 int nft_chain_validate_dependency(const struct nft_chain *chain,
8462                                   enum nft_chain_types type)
8463 {
8464         const struct nft_base_chain *basechain;
8465
8466         if (nft_is_base_chain(chain)) {
8467                 basechain = nft_base_chain(chain);
8468                 if (basechain->type->type != type)
8469                         return -EOPNOTSUPP;
8470         }
8471         return 0;
8472 }
8473 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8474
8475 int nft_chain_validate_hooks(const struct nft_chain *chain,
8476                              unsigned int hook_flags)
8477 {
8478         struct nft_base_chain *basechain;
8479
8480         if (nft_is_base_chain(chain)) {
8481                 basechain = nft_base_chain(chain);
8482
8483                 if ((1 << basechain->ops.hooknum) & hook_flags)
8484                         return 0;
8485
8486                 return -EOPNOTSUPP;
8487         }
8488
8489         return 0;
8490 }
8491 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8492
8493 /*
8494  * Loop detection - walk through the ruleset beginning at the destination chain
8495  * of a new jump until either the source chain is reached (loop) or all
8496  * reachable chains have been traversed.
8497  *
8498  * The loop check is performed whenever a new jump verdict is added to an
8499  * expression or verdict map or a verdict map is bound to a new chain.
8500  */
8501
8502 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8503                                  const struct nft_chain *chain);
8504
8505 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
8506                                         struct nft_set *set,
8507                                         const struct nft_set_iter *iter,
8508                                         struct nft_set_elem *elem)
8509 {
8510         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8511         const struct nft_data *data;
8512
8513         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8514             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
8515                 return 0;
8516
8517         data = nft_set_ext_data(ext);
8518         switch (data->verdict.code) {
8519         case NFT_JUMP:
8520         case NFT_GOTO:
8521                 return nf_tables_check_loops(ctx, data->verdict.chain);
8522         default:
8523                 return 0;
8524         }
8525 }
8526
8527 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8528                                  const struct nft_chain *chain)
8529 {
8530         const struct nft_rule *rule;
8531         const struct nft_expr *expr, *last;
8532         struct nft_set *set;
8533         struct nft_set_binding *binding;
8534         struct nft_set_iter iter;
8535
8536         if (ctx->chain == chain)
8537                 return -ELOOP;
8538
8539         list_for_each_entry(rule, &chain->rules, list) {
8540                 nft_rule_for_each_expr(expr, last, rule) {
8541                         struct nft_immediate_expr *priv;
8542                         const struct nft_data *data;
8543                         int err;
8544
8545                         if (strcmp(expr->ops->type->name, "immediate"))
8546                                 continue;
8547
8548                         priv = nft_expr_priv(expr);
8549                         if (priv->dreg != NFT_REG_VERDICT)
8550                                 continue;
8551
8552                         data = &priv->data;
8553                         switch (data->verdict.code) {
8554                         case NFT_JUMP:
8555                         case NFT_GOTO:
8556                                 err = nf_tables_check_loops(ctx,
8557                                                         data->verdict.chain);
8558                                 if (err < 0)
8559                                         return err;
8560                         default:
8561                                 break;
8562                         }
8563                 }
8564         }
8565
8566         list_for_each_entry(set, &ctx->table->sets, list) {
8567                 if (!nft_is_active_next(ctx->net, set))
8568                         continue;
8569                 if (!(set->flags & NFT_SET_MAP) ||
8570                     set->dtype != NFT_DATA_VERDICT)
8571                         continue;
8572
8573                 list_for_each_entry(binding, &set->bindings, list) {
8574                         if (!(binding->flags & NFT_SET_MAP) ||
8575                             binding->chain != chain)
8576                                 continue;
8577
8578                         iter.genmask    = nft_genmask_next(ctx->net);
8579                         iter.skip       = 0;
8580                         iter.count      = 0;
8581                         iter.err        = 0;
8582                         iter.fn         = nf_tables_loop_check_setelem;
8583
8584                         set->ops->walk(ctx, set, &iter);
8585                         if (iter.err < 0)
8586                                 return iter.err;
8587                 }
8588         }
8589
8590         return 0;
8591 }
8592
8593 /**
8594  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
8595  *
8596  *      @attr: netlink attribute to fetch value from
8597  *      @max: maximum value to be stored in dest
8598  *      @dest: pointer to the variable
8599  *
8600  *      Parse, check and store a given u32 netlink attribute into variable.
8601  *      This function returns -ERANGE if the value goes over maximum value.
8602  *      Otherwise a 0 is returned and the attribute value is stored in the
8603  *      destination variable.
8604  */
8605 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
8606 {
8607         u32 val;
8608
8609         val = ntohl(nla_get_be32(attr));
8610         if (val > max)
8611                 return -ERANGE;
8612
8613         *dest = val;
8614         return 0;
8615 }
8616 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8617
8618 /**
8619  *      nft_parse_register - parse a register value from a netlink attribute
8620  *
8621  *      @attr: netlink attribute
8622  *
8623  *      Parse and translate a register value from a netlink attribute.
8624  *      Registers used to be 128 bit wide, these register numbers will be
8625  *      mapped to the corresponding 32 bit register numbers.
8626  */
8627 static unsigned int nft_parse_register(const struct nlattr *attr)
8628 {
8629         unsigned int reg;
8630
8631         reg = ntohl(nla_get_be32(attr));
8632         switch (reg) {
8633         case NFT_REG_VERDICT...NFT_REG_4:
8634                 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8635         default:
8636                 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8637         }
8638 }
8639
8640 /**
8641  *      nft_dump_register - dump a register value to a netlink attribute
8642  *
8643  *      @skb: socket buffer
8644  *      @attr: attribute number
8645  *      @reg: register number
8646  *
8647  *      Construct a netlink attribute containing the register number. For
8648  *      compatibility reasons, register numbers being a multiple of 4 are
8649  *      translated to the corresponding 128 bit register numbers.
8650  */
8651 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8652 {
8653         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8654                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8655         else
8656                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8657
8658         return nla_put_be32(skb, attr, htonl(reg));
8659 }
8660 EXPORT_SYMBOL_GPL(nft_dump_register);
8661
8662 /**
8663  *      nft_validate_register_load - validate a load from a register
8664  *
8665  *      @reg: the register number
8666  *      @len: the length of the data
8667  *
8668  *      Validate that the input register is one of the general purpose
8669  *      registers and that the length of the load is within the bounds.
8670  */
8671 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
8672 {
8673         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8674                 return -EINVAL;
8675         if (len == 0)
8676                 return -EINVAL;
8677         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
8678                 return -ERANGE;
8679
8680         return 0;
8681 }
8682
8683 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
8684 {
8685         u32 reg;
8686         int err;
8687
8688         reg = nft_parse_register(attr);
8689         err = nft_validate_register_load(reg, len);
8690         if (err < 0)
8691                 return err;
8692
8693         *sreg = reg;
8694         return 0;
8695 }
8696 EXPORT_SYMBOL_GPL(nft_parse_register_load);
8697
8698 /**
8699  *      nft_validate_register_store - validate an expressions' register store
8700  *
8701  *      @ctx: context of the expression performing the load
8702  *      @reg: the destination register number
8703  *      @data: the data to load
8704  *      @type: the data type
8705  *      @len: the length of the data
8706  *
8707  *      Validate that a data load uses the appropriate data type for
8708  *      the destination register and the length is within the bounds.
8709  *      A value of NULL for the data means that its runtime gathered
8710  *      data.
8711  */
8712 static int nft_validate_register_store(const struct nft_ctx *ctx,
8713                                        enum nft_registers reg,
8714                                        const struct nft_data *data,
8715                                        enum nft_data_types type,
8716                                        unsigned int len)
8717 {
8718         int err;
8719
8720         switch (reg) {
8721         case NFT_REG_VERDICT:
8722                 if (type != NFT_DATA_VERDICT)
8723                         return -EINVAL;
8724
8725                 if (data != NULL &&
8726                     (data->verdict.code == NFT_GOTO ||
8727                      data->verdict.code == NFT_JUMP)) {
8728                         err = nf_tables_check_loops(ctx, data->verdict.chain);
8729                         if (err < 0)
8730                                 return err;
8731                 }
8732
8733                 return 0;
8734         default:
8735                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8736                         return -EINVAL;
8737                 if (len == 0)
8738                         return -EINVAL;
8739                 if (reg * NFT_REG32_SIZE + len >
8740                     sizeof_field(struct nft_regs, data))
8741                         return -ERANGE;
8742
8743                 if (data != NULL && type != NFT_DATA_VALUE)
8744                         return -EINVAL;
8745                 return 0;
8746         }
8747 }
8748
8749 int nft_parse_register_store(const struct nft_ctx *ctx,
8750                              const struct nlattr *attr, u8 *dreg,
8751                              const struct nft_data *data,
8752                              enum nft_data_types type, unsigned int len)
8753 {
8754         int err;
8755         u32 reg;
8756
8757         reg = nft_parse_register(attr);
8758         err = nft_validate_register_store(ctx, reg, data, type, len);
8759         if (err < 0)
8760                 return err;
8761
8762         *dreg = reg;
8763         return 0;
8764 }
8765 EXPORT_SYMBOL_GPL(nft_parse_register_store);
8766
8767 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8768         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
8769         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
8770                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
8771         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
8772 };
8773
8774 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8775                             struct nft_data_desc *desc, const struct nlattr *nla)
8776 {
8777         u8 genmask = nft_genmask_next(ctx->net);
8778         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8779         struct nft_chain *chain;
8780         int err;
8781
8782         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8783                                           nft_verdict_policy, NULL);
8784         if (err < 0)
8785                 return err;
8786
8787         if (!tb[NFTA_VERDICT_CODE])
8788                 return -EINVAL;
8789         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
8790
8791         switch (data->verdict.code) {
8792         default:
8793                 switch (data->verdict.code & NF_VERDICT_MASK) {
8794                 case NF_ACCEPT:
8795                 case NF_DROP:
8796                 case NF_QUEUE:
8797                         break;
8798                 default:
8799                         return -EINVAL;
8800                 }
8801                 fallthrough;
8802         case NFT_CONTINUE:
8803         case NFT_BREAK:
8804         case NFT_RETURN:
8805                 break;
8806         case NFT_JUMP:
8807         case NFT_GOTO:
8808                 if (tb[NFTA_VERDICT_CHAIN]) {
8809                         chain = nft_chain_lookup(ctx->net, ctx->table,
8810                                                  tb[NFTA_VERDICT_CHAIN],
8811                                                  genmask);
8812                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8813                         chain = nft_chain_lookup_byid(ctx->net,
8814                                                       tb[NFTA_VERDICT_CHAIN_ID]);
8815                         if (IS_ERR(chain))
8816                                 return PTR_ERR(chain);
8817                 } else {
8818                         return -EINVAL;
8819                 }
8820
8821                 if (IS_ERR(chain))
8822                         return PTR_ERR(chain);
8823                 if (nft_is_base_chain(chain))
8824                         return -EOPNOTSUPP;
8825
8826                 chain->use++;
8827                 data->verdict.chain = chain;
8828                 break;
8829         }
8830
8831         desc->len = sizeof(data->verdict);
8832         desc->type = NFT_DATA_VERDICT;
8833         return 0;
8834 }
8835
8836 static void nft_verdict_uninit(const struct nft_data *data)
8837 {
8838         struct nft_chain *chain;
8839         struct nft_rule *rule;
8840
8841         switch (data->verdict.code) {
8842         case NFT_JUMP:
8843         case NFT_GOTO:
8844                 chain = data->verdict.chain;
8845                 chain->use--;
8846
8847                 if (!nft_chain_is_bound(chain))
8848                         break;
8849
8850                 chain->table->use--;
8851                 list_for_each_entry(rule, &chain->rules, list)
8852                         chain->use--;
8853
8854                 nft_chain_del(chain);
8855                 break;
8856         }
8857 }
8858
8859 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
8860 {
8861         struct nlattr *nest;
8862
8863         nest = nla_nest_start_noflag(skb, type);
8864         if (!nest)
8865                 goto nla_put_failure;
8866
8867         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
8868                 goto nla_put_failure;
8869
8870         switch (v->code) {
8871         case NFT_JUMP:
8872         case NFT_GOTO:
8873                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
8874                                    v->chain->name))
8875                         goto nla_put_failure;
8876         }
8877         nla_nest_end(skb, nest);
8878         return 0;
8879
8880 nla_put_failure:
8881         return -1;
8882 }
8883
8884 static int nft_value_init(const struct nft_ctx *ctx,
8885                           struct nft_data *data, unsigned int size,
8886                           struct nft_data_desc *desc, const struct nlattr *nla)
8887 {
8888         unsigned int len;
8889
8890         len = nla_len(nla);
8891         if (len == 0)
8892                 return -EINVAL;
8893         if (len > size)
8894                 return -EOVERFLOW;
8895
8896         nla_memcpy(data->data, nla, len);
8897         desc->type = NFT_DATA_VALUE;
8898         desc->len  = len;
8899         return 0;
8900 }
8901
8902 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8903                           unsigned int len)
8904 {
8905         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8906 }
8907
8908 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
8909         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
8910         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
8911 };
8912
8913 /**
8914  *      nft_data_init - parse nf_tables data netlink attributes
8915  *
8916  *      @ctx: context of the expression using the data
8917  *      @data: destination struct nft_data
8918  *      @size: maximum data length
8919  *      @desc: data description
8920  *      @nla: netlink attribute containing data
8921  *
8922  *      Parse the netlink data attributes and initialize a struct nft_data.
8923  *      The type and length of data are returned in the data description.
8924  *
8925  *      The caller can indicate that it only wants to accept data of type
8926  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
8927  */
8928 int nft_data_init(const struct nft_ctx *ctx,
8929                   struct nft_data *data, unsigned int size,
8930                   struct nft_data_desc *desc, const struct nlattr *nla)
8931 {
8932         struct nlattr *tb[NFTA_DATA_MAX + 1];
8933         int err;
8934
8935         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8936                                           nft_data_policy, NULL);
8937         if (err < 0)
8938                 return err;
8939
8940         if (tb[NFTA_DATA_VALUE])
8941                 return nft_value_init(ctx, data, size, desc,
8942                                       tb[NFTA_DATA_VALUE]);
8943         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8944                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8945         return -EINVAL;
8946 }
8947 EXPORT_SYMBOL_GPL(nft_data_init);
8948
8949 /**
8950  *      nft_data_release - release a nft_data item
8951  *
8952  *      @data: struct nft_data to release
8953  *      @type: type of data
8954  *
8955  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8956  *      all others need to be released by calling this function.
8957  */
8958 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
8959 {
8960         if (type < NFT_DATA_VERDICT)
8961                 return;
8962         switch (type) {
8963         case NFT_DATA_VERDICT:
8964                 return nft_verdict_uninit(data);
8965         default:
8966                 WARN_ON(1);
8967         }
8968 }
8969 EXPORT_SYMBOL_GPL(nft_data_release);
8970
8971 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8972                   enum nft_data_types type, unsigned int len)
8973 {
8974         struct nlattr *nest;
8975         int err;
8976
8977         nest = nla_nest_start_noflag(skb, attr);
8978         if (nest == NULL)
8979                 return -1;
8980
8981         switch (type) {
8982         case NFT_DATA_VALUE:
8983                 err = nft_value_dump(skb, data, len);
8984                 break;
8985         case NFT_DATA_VERDICT:
8986                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
8987                 break;
8988         default:
8989                 err = -EINVAL;
8990                 WARN_ON(1);
8991         }
8992
8993         nla_nest_end(skb, nest);
8994         return err;
8995 }
8996 EXPORT_SYMBOL_GPL(nft_data_dump);
8997
8998 int __nft_release_basechain(struct nft_ctx *ctx)
8999 {
9000         struct nft_rule *rule, *nr;
9001
9002         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9003                 return 0;
9004
9005         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9006         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9007                 list_del(&rule->list);
9008                 ctx->chain->use--;
9009                 nf_tables_rule_release(ctx, rule);
9010         }
9011         nft_chain_del(ctx->chain);
9012         ctx->table->use--;
9013         nf_tables_chain_destroy(ctx);
9014
9015         return 0;
9016 }
9017 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9018
9019 static void __nft_release_hook(struct net *net, struct nft_table *table)
9020 {
9021         struct nft_chain *chain;
9022
9023         list_for_each_entry(chain, &table->chains, list)
9024                 nf_tables_unregister_hook(net, table, chain);
9025 }
9026
9027 static void __nft_release_hooks(struct net *net)
9028 {
9029         struct nft_table *table;
9030
9031         list_for_each_entry(table, &net->nft.tables, list)
9032                 __nft_release_hook(net, table);
9033 }
9034
9035 static void __nft_release_table(struct net *net, struct nft_table *table)
9036 {
9037         struct nft_flowtable *flowtable, *nf;
9038         struct nft_chain *chain, *nc;
9039         struct nft_object *obj, *ne;
9040         struct nft_rule *rule, *nr;
9041         struct nft_set *set, *ns;
9042         struct nft_ctx ctx = {
9043                 .net    = net,
9044                 .family = NFPROTO_NETDEV,
9045         };
9046
9047         ctx.family = table->family;
9048         ctx.table = table;
9049         list_for_each_entry(chain, &table->chains, list) {
9050                 ctx.chain = chain;
9051                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9052                         list_del(&rule->list);
9053                         chain->use--;
9054                         nf_tables_rule_release(&ctx, rule);
9055                 }
9056         }
9057         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9058                 list_del(&flowtable->list);
9059                 table->use--;
9060                 nf_tables_flowtable_destroy(flowtable);
9061         }
9062         list_for_each_entry_safe(set, ns, &table->sets, list) {
9063                 list_del(&set->list);
9064                 table->use--;
9065                 nft_set_destroy(&ctx, set);
9066         }
9067         list_for_each_entry_safe(obj, ne, &table->objects, list) {
9068                 nft_obj_del(obj);
9069                 table->use--;
9070                 nft_obj_destroy(&ctx, obj);
9071         }
9072         list_for_each_entry_safe(chain, nc, &table->chains, list) {
9073                 ctx.chain = chain;
9074                 nft_chain_del(chain);
9075                 table->use--;
9076                 nf_tables_chain_destroy(&ctx);
9077         }
9078         list_del(&table->list);
9079         nf_tables_table_destroy(&ctx);
9080 }
9081
9082 static void __nft_release_tables(struct net *net, u32 nlpid)
9083 {
9084         struct nft_table *table, *nt;
9085
9086         list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
9087                 if (nft_table_has_owner(table) &&
9088                     nlpid != table->nlpid)
9089                         continue;
9090
9091                 __nft_release_table(net, table);
9092         }
9093 }
9094
9095 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9096                             void *ptr)
9097 {
9098         struct netlink_notify *n = ptr;
9099         struct nft_table *table, *nt;
9100         struct net *net = n->net;
9101         bool release = false;
9102
9103         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9104                 return NOTIFY_DONE;
9105
9106         mutex_lock(&net->nft.commit_mutex);
9107         list_for_each_entry(table, &net->nft.tables, list) {
9108                 if (nft_table_has_owner(table) &&
9109                     n->portid == table->nlpid) {
9110                         __nft_release_hook(net, table);
9111                         release = true;
9112                 }
9113         }
9114         if (release) {
9115                 synchronize_rcu();
9116                 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
9117                         if (nft_table_has_owner(table) &&
9118                             n->portid == table->nlpid)
9119                                 __nft_release_table(net, table);
9120                 }
9121         }
9122         mutex_unlock(&net->nft.commit_mutex);
9123
9124         return NOTIFY_DONE;
9125 }
9126
9127 static struct notifier_block nft_nl_notifier = {
9128         .notifier_call  = nft_rcv_nl_event,
9129 };
9130
9131 static int __net_init nf_tables_init_net(struct net *net)
9132 {
9133         INIT_LIST_HEAD(&net->nft.tables);
9134         INIT_LIST_HEAD(&net->nft.commit_list);
9135         INIT_LIST_HEAD(&net->nft.module_list);
9136         INIT_LIST_HEAD(&net->nft.notify_list);
9137         mutex_init(&net->nft.commit_mutex);
9138         net->nft.base_seq = 1;
9139         net->nft.validate_state = NFT_VALIDATE_SKIP;
9140
9141         return 0;
9142 }
9143
9144 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9145 {
9146         __nft_release_hooks(net);
9147 }
9148
9149 static void __net_exit nf_tables_exit_net(struct net *net)
9150 {
9151         mutex_lock(&net->nft.commit_mutex);
9152         if (!list_empty(&net->nft.commit_list))
9153                 __nf_tables_abort(net, NFNL_ABORT_NONE);
9154         __nft_release_tables(net, 0);
9155         mutex_unlock(&net->nft.commit_mutex);
9156         WARN_ON_ONCE(!list_empty(&net->nft.tables));
9157         WARN_ON_ONCE(!list_empty(&net->nft.module_list));
9158         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
9159 }
9160
9161 static struct pernet_operations nf_tables_net_ops = {
9162         .init           = nf_tables_init_net,
9163         .pre_exit       = nf_tables_pre_exit_net,
9164         .exit           = nf_tables_exit_net,
9165 };
9166
9167 static int __init nf_tables_module_init(void)
9168 {
9169         int err;
9170
9171         spin_lock_init(&nf_tables_destroy_list_lock);
9172         err = register_pernet_subsys(&nf_tables_net_ops);
9173         if (err < 0)
9174                 return err;
9175
9176         err = nft_chain_filter_init();
9177         if (err < 0)
9178                 goto err_chain_filter;
9179
9180         err = nf_tables_core_module_init();
9181         if (err < 0)
9182                 goto err_core_module;
9183
9184         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9185         if (err < 0)
9186                 goto err_netdev_notifier;
9187
9188         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9189         if (err < 0)
9190                 goto err_rht_objname;
9191
9192         err = nft_offload_init();
9193         if (err < 0)
9194                 goto err_offload;
9195
9196         err = netlink_register_notifier(&nft_nl_notifier);
9197         if (err < 0)
9198                 goto err_netlink_notifier;
9199
9200         /* must be last */
9201         err = nfnetlink_subsys_register(&nf_tables_subsys);
9202         if (err < 0)
9203                 goto err_nfnl_subsys;
9204
9205         nft_chain_route_init();
9206
9207         return err;
9208
9209 err_nfnl_subsys:
9210         netlink_unregister_notifier(&nft_nl_notifier);
9211 err_netlink_notifier:
9212         nft_offload_exit();
9213 err_offload:
9214         rhltable_destroy(&nft_objname_ht);
9215 err_rht_objname:
9216         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9217 err_netdev_notifier:
9218         nf_tables_core_module_exit();
9219 err_core_module:
9220         nft_chain_filter_fini();
9221 err_chain_filter:
9222         unregister_pernet_subsys(&nf_tables_net_ops);
9223         return err;
9224 }
9225
9226 static void __exit nf_tables_module_exit(void)
9227 {
9228         nfnetlink_subsys_unregister(&nf_tables_subsys);
9229         netlink_unregister_notifier(&nft_nl_notifier);
9230         nft_offload_exit();
9231         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9232         nft_chain_filter_fini();
9233         nft_chain_route_fini();
9234         unregister_pernet_subsys(&nf_tables_net_ops);
9235         cancel_work_sync(&trans_destroy_work);
9236         rcu_barrier();
9237         rhltable_destroy(&nft_objname_ht);
9238         nf_tables_core_module_exit();
9239 }
9240
9241 module_init(nf_tables_module_init);
9242 module_exit(nf_tables_module_exit);
9243
9244 MODULE_LICENSE("GPL");
9245 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9246 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);