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 int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5299                                    const struct nft_set_ext *ext,
5300                                    struct nft_expr *expr_array[],
5301                                    u32 num_exprs)
5302 {
5303         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5304         struct nft_expr *expr;
5305         int i, err;
5306
5307         for (i = 0; i < num_exprs; i++) {
5308                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5309                 err = nft_expr_clone(expr, expr_array[i]);
5310                 if (err < 0)
5311                         goto err_elem_expr_setup;
5312
5313                 elem_expr->size += expr_array[i]->ops->size;
5314                 nft_expr_destroy(ctx, expr_array[i]);
5315                 expr_array[i] = NULL;
5316         }
5317
5318         return 0;
5319
5320 err_elem_expr_setup:
5321         for (; i < num_exprs; i++) {
5322                 nft_expr_destroy(ctx, expr_array[i]);
5323                 expr_array[i] = NULL;
5324         }
5325
5326         return -ENOMEM;
5327 }
5328
5329 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5330                             const struct nlattr *attr, u32 nlmsg_flags)
5331 {
5332         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5333         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5334         u8 genmask = nft_genmask_next(ctx->net);
5335         u32 flags = 0, size = 0, num_exprs = 0;
5336         struct nft_set_ext_tmpl tmpl;
5337         struct nft_set_ext *ext, *ext2;
5338         struct nft_set_elem elem;
5339         struct nft_set_binding *binding;
5340         struct nft_object *obj = NULL;
5341         struct nft_userdata *udata;
5342         struct nft_data_desc desc;
5343         enum nft_registers dreg;
5344         struct nft_trans *trans;
5345         u64 timeout;
5346         u64 expiration;
5347         int err, i;
5348         u8 ulen;
5349
5350         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5351                                           nft_set_elem_policy, NULL);
5352         if (err < 0)
5353                 return err;
5354
5355         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5356                 return -EINVAL;
5357
5358         nft_set_ext_prepare(&tmpl);
5359
5360         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5361         if (err < 0)
5362                 return err;
5363         if (flags != 0)
5364                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5365
5366         if (set->flags & NFT_SET_MAP) {
5367                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5368                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5369                         return -EINVAL;
5370         } else {
5371                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5372                         return -EINVAL;
5373         }
5374
5375         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5376              (nla[NFTA_SET_ELEM_DATA] ||
5377               nla[NFTA_SET_ELEM_OBJREF] ||
5378               nla[NFTA_SET_ELEM_TIMEOUT] ||
5379               nla[NFTA_SET_ELEM_EXPIRATION] ||
5380               nla[NFTA_SET_ELEM_USERDATA] ||
5381               nla[NFTA_SET_ELEM_EXPR] ||
5382               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5383                 return -EINVAL;
5384
5385         timeout = 0;
5386         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5387                 if (!(set->flags & NFT_SET_TIMEOUT))
5388                         return -EINVAL;
5389                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5390                                             &timeout);
5391                 if (err)
5392                         return err;
5393         } else if (set->flags & NFT_SET_TIMEOUT) {
5394                 timeout = set->timeout;
5395         }
5396
5397         expiration = 0;
5398         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5399                 if (!(set->flags & NFT_SET_TIMEOUT))
5400                         return -EINVAL;
5401                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5402                                             &expiration);
5403                 if (err)
5404                         return err;
5405         }
5406
5407         if (nla[NFTA_SET_ELEM_EXPR]) {
5408                 struct nft_expr *expr;
5409
5410                 if (set->num_exprs && set->num_exprs != 1)
5411                         return -EOPNOTSUPP;
5412
5413                 expr = nft_set_elem_expr_alloc(ctx, set,
5414                                                nla[NFTA_SET_ELEM_EXPR]);
5415                 if (IS_ERR(expr))
5416                         return PTR_ERR(expr);
5417
5418                 expr_array[0] = expr;
5419                 num_exprs = 1;
5420
5421                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5422                         err = -EOPNOTSUPP;
5423                         goto err_set_elem_expr;
5424                 }
5425         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5426                 struct nft_expr *expr;
5427                 struct nlattr *tmp;
5428                 int left;
5429
5430                 i = 0;
5431                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5432                         if (i == NFT_SET_EXPR_MAX ||
5433                             (set->num_exprs && set->num_exprs == i)) {
5434                                 err = -E2BIG;
5435                                 goto err_set_elem_expr;
5436                         }
5437                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
5438                                 err = -EINVAL;
5439                                 goto err_set_elem_expr;
5440                         }
5441                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5442                         if (IS_ERR(expr)) {
5443                                 err = PTR_ERR(expr);
5444                                 goto err_set_elem_expr;
5445                         }
5446                         expr_array[i] = expr;
5447                         num_exprs++;
5448
5449                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5450                                 err = -EOPNOTSUPP;
5451                                 goto err_set_elem_expr;
5452                         }
5453                         i++;
5454                 }
5455                 if (set->num_exprs && set->num_exprs != i) {
5456                         err = -EOPNOTSUPP;
5457                         goto err_set_elem_expr;
5458                 }
5459         } else if (set->num_exprs > 0) {
5460                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5461                 if (err < 0)
5462                         goto err_set_elem_expr_clone;
5463
5464                 num_exprs = set->num_exprs;
5465         }
5466
5467         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5468                                     nla[NFTA_SET_ELEM_KEY]);
5469         if (err < 0)
5470                 goto err_set_elem_expr;
5471
5472         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5473
5474         if (nla[NFTA_SET_ELEM_KEY_END]) {
5475                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5476                                             nla[NFTA_SET_ELEM_KEY_END]);
5477                 if (err < 0)
5478                         goto err_parse_key;
5479
5480                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5481         }
5482
5483         if (timeout > 0) {
5484                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5485                 if (timeout != set->timeout)
5486                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5487         }
5488
5489         if (num_exprs) {
5490                 for (i = 0; i < num_exprs; i++)
5491                         size += expr_array[i]->ops->size;
5492
5493                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5494                                        sizeof(struct nft_set_elem_expr) +
5495                                        size);
5496         }
5497
5498         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5499                 if (!(set->flags & NFT_SET_OBJECT)) {
5500                         err = -EINVAL;
5501                         goto err_parse_key_end;
5502                 }
5503                 obj = nft_obj_lookup(ctx->net, ctx->table,
5504                                      nla[NFTA_SET_ELEM_OBJREF],
5505                                      set->objtype, genmask);
5506                 if (IS_ERR(obj)) {
5507                         err = PTR_ERR(obj);
5508                         goto err_parse_key_end;
5509                 }
5510                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5511         }
5512
5513         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5514                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5515                                              nla[NFTA_SET_ELEM_DATA]);
5516                 if (err < 0)
5517                         goto err_parse_key_end;
5518
5519                 dreg = nft_type_to_reg(set->dtype);
5520                 list_for_each_entry(binding, &set->bindings, list) {
5521                         struct nft_ctx bind_ctx = {
5522                                 .net    = ctx->net,
5523                                 .family = ctx->family,
5524                                 .table  = ctx->table,
5525                                 .chain  = (struct nft_chain *)binding->chain,
5526                         };
5527
5528                         if (!(binding->flags & NFT_SET_MAP))
5529                                 continue;
5530
5531                         err = nft_validate_register_store(&bind_ctx, dreg,
5532                                                           &elem.data.val,
5533                                                           desc.type, desc.len);
5534                         if (err < 0)
5535                                 goto err_parse_data;
5536
5537                         if (desc.type == NFT_DATA_VERDICT &&
5538                             (elem.data.val.verdict.code == NFT_GOTO ||
5539                              elem.data.val.verdict.code == NFT_JUMP))
5540                                 nft_validate_state_update(ctx->net,
5541                                                           NFT_VALIDATE_NEED);
5542                 }
5543
5544                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5545         }
5546
5547         /* The full maximum length of userdata can exceed the maximum
5548          * offset value (U8_MAX) for following extensions, therefor it
5549          * must be the last extension added.
5550          */
5551         ulen = 0;
5552         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5553                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5554                 if (ulen > 0)
5555                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5556                                                ulen);
5557         }
5558
5559         err = -ENOMEM;
5560         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5561                                       elem.key_end.val.data, elem.data.val.data,
5562                                       timeout, expiration, GFP_KERNEL);
5563         if (elem.priv == NULL)
5564                 goto err_parse_data;
5565
5566         ext = nft_set_elem_ext(set, elem.priv);
5567         if (flags)
5568                 *nft_set_ext_flags(ext) = flags;
5569         if (ulen > 0) {
5570                 udata = nft_set_ext_userdata(ext);
5571                 udata->len = ulen - 1;
5572                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5573         }
5574         if (obj) {
5575                 *nft_set_ext_obj(ext) = obj;
5576                 obj->use++;
5577         }
5578         err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
5579         if (err < 0)
5580                 goto err_elem_expr;
5581
5582         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5583         if (trans == NULL) {
5584                 err = -ENOMEM;
5585                 goto err_elem_expr;
5586         }
5587
5588         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5589         err = set->ops->insert(ctx->net, set, &elem, &ext2);
5590         if (err) {
5591                 if (err == -EEXIST) {
5592                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5593                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5594                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5595                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5596                                 goto err_element_clash;
5597                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5598                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5599                              memcmp(nft_set_ext_data(ext),
5600                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
5601                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5602                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5603                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5604                                 goto err_element_clash;
5605                         else if (!(nlmsg_flags & NLM_F_EXCL))
5606                                 err = 0;
5607                 } else if (err == -ENOTEMPTY) {
5608                         /* ENOTEMPTY reports overlapping between this element
5609                          * and an existing one.
5610                          */
5611                         err = -EEXIST;
5612                 }
5613                 goto err_element_clash;
5614         }
5615
5616         if (set->size &&
5617             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5618                 err = -ENFILE;
5619                 goto err_set_full;
5620         }
5621
5622         nft_trans_elem(trans) = elem;
5623         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5624         return 0;
5625
5626 err_set_full:
5627         set->ops->remove(ctx->net, set, &elem);
5628 err_element_clash:
5629         kfree(trans);
5630 err_elem_expr:
5631         if (obj)
5632                 obj->use--;
5633
5634         nf_tables_set_elem_destroy(ctx, set, elem.priv);
5635 err_parse_data:
5636         if (nla[NFTA_SET_ELEM_DATA] != NULL)
5637                 nft_data_release(&elem.data.val, desc.type);
5638 err_parse_key_end:
5639         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5640 err_parse_key:
5641         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5642 err_set_elem_expr:
5643         for (i = 0; i < num_exprs && expr_array[i]; i++)
5644                 nft_expr_destroy(ctx, expr_array[i]);
5645 err_set_elem_expr_clone:
5646         return err;
5647 }
5648
5649 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5650                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5651                                 const struct nlattr * const nla[],
5652                                 struct netlink_ext_ack *extack)
5653 {
5654         u8 genmask = nft_genmask_next(net);
5655         const struct nlattr *attr;
5656         struct nft_set *set;
5657         struct nft_ctx ctx;
5658         int rem, err;
5659
5660         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5661                 return -EINVAL;
5662
5663         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5664                                          genmask, NETLINK_CB(skb).portid);
5665         if (err < 0)
5666                 return err;
5667
5668         set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5669                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5670         if (IS_ERR(set))
5671                 return PTR_ERR(set);
5672
5673         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5674                 return -EBUSY;
5675
5676         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5677                 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5678                 if (err < 0)
5679                         return err;
5680         }
5681
5682         if (net->nft.validate_state == NFT_VALIDATE_DO)
5683                 return nft_table_validate(net, ctx.table);
5684
5685         return 0;
5686 }
5687
5688 /**
5689  *      nft_data_hold - hold a nft_data item
5690  *
5691  *      @data: struct nft_data to release
5692  *      @type: type of data
5693  *
5694  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5695  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5696  *      NFT_GOTO verdicts. This function must be called on active data objects
5697  *      from the second phase of the commit protocol.
5698  */
5699 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5700 {
5701         struct nft_chain *chain;
5702         struct nft_rule *rule;
5703
5704         if (type == NFT_DATA_VERDICT) {
5705                 switch (data->verdict.code) {
5706                 case NFT_JUMP:
5707                 case NFT_GOTO:
5708                         chain = data->verdict.chain;
5709                         chain->use++;
5710
5711                         if (!nft_chain_is_bound(chain))
5712                                 break;
5713
5714                         chain->table->use++;
5715                         list_for_each_entry(rule, &chain->rules, list)
5716                                 chain->use++;
5717
5718                         nft_chain_add(chain->table, chain);
5719                         break;
5720                 }
5721         }
5722 }
5723
5724 static void nft_set_elem_activate(const struct net *net,
5725                                   const struct nft_set *set,
5726                                   struct nft_set_elem *elem)
5727 {
5728         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5729
5730         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5731                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5732         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5733                 (*nft_set_ext_obj(ext))->use++;
5734 }
5735
5736 static void nft_set_elem_deactivate(const struct net *net,
5737                                     const struct nft_set *set,
5738                                     struct nft_set_elem *elem)
5739 {
5740         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5741
5742         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5743                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5744         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5745                 (*nft_set_ext_obj(ext))->use--;
5746 }
5747
5748 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5749                            const struct nlattr *attr)
5750 {
5751         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5752         struct nft_set_ext_tmpl tmpl;
5753         struct nft_set_elem elem;
5754         struct nft_set_ext *ext;
5755         struct nft_trans *trans;
5756         u32 flags = 0;
5757         void *priv;
5758         int err;
5759
5760         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5761                                           nft_set_elem_policy, NULL);
5762         if (err < 0)
5763                 return err;
5764
5765         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5766                 return -EINVAL;
5767
5768         nft_set_ext_prepare(&tmpl);
5769
5770         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5771         if (err < 0)
5772                 return err;
5773         if (flags != 0)
5774                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5775
5776         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5777                                     nla[NFTA_SET_ELEM_KEY]);
5778         if (err < 0)
5779                 return err;
5780
5781         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5782
5783         if (nla[NFTA_SET_ELEM_KEY_END]) {
5784                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5785                                             nla[NFTA_SET_ELEM_KEY_END]);
5786                 if (err < 0)
5787                         return err;
5788
5789                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5790         }
5791
5792         err = -ENOMEM;
5793         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5794                                       elem.key_end.val.data, NULL, 0, 0,
5795                                       GFP_KERNEL);
5796         if (elem.priv == NULL)
5797                 goto fail_elem;
5798
5799         ext = nft_set_elem_ext(set, elem.priv);
5800         if (flags)
5801                 *nft_set_ext_flags(ext) = flags;
5802
5803         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5804         if (trans == NULL)
5805                 goto fail_trans;
5806
5807         priv = set->ops->deactivate(ctx->net, set, &elem);
5808         if (priv == NULL) {
5809                 err = -ENOENT;
5810                 goto fail_ops;
5811         }
5812         kfree(elem.priv);
5813         elem.priv = priv;
5814
5815         nft_set_elem_deactivate(ctx->net, set, &elem);
5816
5817         nft_trans_elem(trans) = elem;
5818         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5819         return 0;
5820
5821 fail_ops:
5822         kfree(trans);
5823 fail_trans:
5824         kfree(elem.priv);
5825 fail_elem:
5826         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5827         return err;
5828 }
5829
5830 static int nft_flush_set(const struct nft_ctx *ctx,
5831                          struct nft_set *set,
5832                          const struct nft_set_iter *iter,
5833                          struct nft_set_elem *elem)
5834 {
5835         struct nft_trans *trans;
5836         int err;
5837
5838         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5839                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
5840         if (!trans)
5841                 return -ENOMEM;
5842
5843         if (!set->ops->flush(ctx->net, set, elem->priv)) {
5844                 err = -ENOENT;
5845                 goto err1;
5846         }
5847         set->ndeact++;
5848
5849         nft_set_elem_deactivate(ctx->net, set, elem);
5850         nft_trans_elem_set(trans) = set;
5851         nft_trans_elem(trans) = *elem;
5852         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5853
5854         return 0;
5855 err1:
5856         kfree(trans);
5857         return err;
5858 }
5859
5860 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5861                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5862                                 const struct nlattr * const nla[],
5863                                 struct netlink_ext_ack *extack)
5864 {
5865         u8 genmask = nft_genmask_next(net);
5866         const struct nlattr *attr;
5867         struct nft_set *set;
5868         struct nft_ctx ctx;
5869         int rem, err = 0;
5870
5871         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5872                                          genmask, NETLINK_CB(skb).portid);
5873         if (err < 0)
5874                 return err;
5875
5876         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5877         if (IS_ERR(set))
5878                 return PTR_ERR(set);
5879         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5880                 return -EBUSY;
5881
5882         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5883                 struct nft_set_iter iter = {
5884                         .genmask        = genmask,
5885                         .fn             = nft_flush_set,
5886                 };
5887                 set->ops->walk(&ctx, set, &iter);
5888
5889                 return iter.err;
5890         }
5891
5892         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5893                 err = nft_del_setelem(&ctx, set, attr);
5894                 if (err < 0)
5895                         break;
5896
5897                 set->ndeact++;
5898         }
5899         return err;
5900 }
5901
5902 void nft_set_gc_batch_release(struct rcu_head *rcu)
5903 {
5904         struct nft_set_gc_batch *gcb;
5905         unsigned int i;
5906
5907         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5908         for (i = 0; i < gcb->head.cnt; i++)
5909                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5910         kfree(gcb);
5911 }
5912
5913 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5914                                                 gfp_t gfp)
5915 {
5916         struct nft_set_gc_batch *gcb;
5917
5918         gcb = kzalloc(sizeof(*gcb), gfp);
5919         if (gcb == NULL)
5920                 return gcb;
5921         gcb->head.set = set;
5922         return gcb;
5923 }
5924
5925 /*
5926  * Stateful objects
5927  */
5928
5929 /**
5930  *      nft_register_obj- register nf_tables stateful object type
5931  *      @obj_type: object type
5932  *
5933  *      Registers the object type for use with nf_tables. Returns zero on
5934  *      success or a negative errno code otherwise.
5935  */
5936 int nft_register_obj(struct nft_object_type *obj_type)
5937 {
5938         if (obj_type->type == NFT_OBJECT_UNSPEC)
5939                 return -EINVAL;
5940
5941         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5942         list_add_rcu(&obj_type->list, &nf_tables_objects);
5943         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5944         return 0;
5945 }
5946 EXPORT_SYMBOL_GPL(nft_register_obj);
5947
5948 /**
5949  *      nft_unregister_obj - unregister nf_tables object type
5950  *      @obj_type: object type
5951  *
5952  *      Unregisters the object type for use with nf_tables.
5953  */
5954 void nft_unregister_obj(struct nft_object_type *obj_type)
5955 {
5956         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5957         list_del_rcu(&obj_type->list);
5958         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5959 }
5960 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5961
5962 struct nft_object *nft_obj_lookup(const struct net *net,
5963                                   const struct nft_table *table,
5964                                   const struct nlattr *nla, u32 objtype,
5965                                   u8 genmask)
5966 {
5967         struct nft_object_hash_key k = { .table = table };
5968         char search[NFT_OBJ_MAXNAMELEN];
5969         struct rhlist_head *tmp, *list;
5970         struct nft_object *obj;
5971
5972         nla_strscpy(search, nla, sizeof(search));
5973         k.name = search;
5974
5975         WARN_ON_ONCE(!rcu_read_lock_held() &&
5976                      !lockdep_commit_lock_is_held(net));
5977
5978         rcu_read_lock();
5979         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5980         if (!list)
5981                 goto out;
5982
5983         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5984                 if (objtype == obj->ops->type->type &&
5985                     nft_active_genmask(obj, genmask)) {
5986                         rcu_read_unlock();
5987                         return obj;
5988                 }
5989         }
5990 out:
5991         rcu_read_unlock();
5992         return ERR_PTR(-ENOENT);
5993 }
5994 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5995
5996 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5997                                                   const struct nlattr *nla,
5998                                                   u32 objtype, u8 genmask)
5999 {
6000         struct nft_object *obj;
6001
6002         list_for_each_entry(obj, &table->objects, list) {
6003                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6004                     objtype == obj->ops->type->type &&
6005                     nft_active_genmask(obj, genmask))
6006                         return obj;
6007         }
6008         return ERR_PTR(-ENOENT);
6009 }
6010
6011 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6012         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6013                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6014         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6015                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6016         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6017         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6018         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6019         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6020                                     .len = NFT_USERDATA_MAXLEN },
6021 };
6022
6023 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6024                                        const struct nft_object_type *type,
6025                                        const struct nlattr *attr)
6026 {
6027         struct nlattr **tb;
6028         const struct nft_object_ops *ops;
6029         struct nft_object *obj;
6030         int err = -ENOMEM;
6031
6032         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6033         if (!tb)
6034                 goto err1;
6035
6036         if (attr) {
6037                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6038                                                   type->policy, NULL);
6039                 if (err < 0)
6040                         goto err2;
6041         } else {
6042                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6043         }
6044
6045         if (type->select_ops) {
6046                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6047                 if (IS_ERR(ops)) {
6048                         err = PTR_ERR(ops);
6049                         goto err2;
6050                 }
6051         } else {
6052                 ops = type->ops;
6053         }
6054
6055         err = -ENOMEM;
6056         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6057         if (!obj)
6058                 goto err2;
6059
6060         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6061         if (err < 0)
6062                 goto err3;
6063
6064         obj->ops = ops;
6065
6066         kfree(tb);
6067         return obj;
6068 err3:
6069         kfree(obj);
6070 err2:
6071         kfree(tb);
6072 err1:
6073         return ERR_PTR(err);
6074 }
6075
6076 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6077                            struct nft_object *obj, bool reset)
6078 {
6079         struct nlattr *nest;
6080
6081         nest = nla_nest_start_noflag(skb, attr);
6082         if (!nest)
6083                 goto nla_put_failure;
6084         if (obj->ops->dump(skb, obj, reset) < 0)
6085                 goto nla_put_failure;
6086         nla_nest_end(skb, nest);
6087         return 0;
6088
6089 nla_put_failure:
6090         return -1;
6091 }
6092
6093 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6094 {
6095         const struct nft_object_type *type;
6096
6097         list_for_each_entry(type, &nf_tables_objects, list) {
6098                 if (objtype == type->type)
6099                         return type;
6100         }
6101         return NULL;
6102 }
6103
6104 static const struct nft_object_type *
6105 nft_obj_type_get(struct net *net, u32 objtype)
6106 {
6107         const struct nft_object_type *type;
6108
6109         type = __nft_obj_type_get(objtype);
6110         if (type != NULL && try_module_get(type->owner))
6111                 return type;
6112
6113         lockdep_nfnl_nft_mutex_not_held();
6114 #ifdef CONFIG_MODULES
6115         if (type == NULL) {
6116                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6117                         return ERR_PTR(-EAGAIN);
6118         }
6119 #endif
6120         return ERR_PTR(-ENOENT);
6121 }
6122
6123 static int nf_tables_updobj(const struct nft_ctx *ctx,
6124                             const struct nft_object_type *type,
6125                             const struct nlattr *attr,
6126                             struct nft_object *obj)
6127 {
6128         struct nft_object *newobj;
6129         struct nft_trans *trans;
6130         int err;
6131
6132         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6133                                 sizeof(struct nft_trans_obj));
6134         if (!trans)
6135                 return -ENOMEM;
6136
6137         newobj = nft_obj_init(ctx, type, attr);
6138         if (IS_ERR(newobj)) {
6139                 err = PTR_ERR(newobj);
6140                 goto err_free_trans;
6141         }
6142
6143         nft_trans_obj(trans) = obj;
6144         nft_trans_obj_update(trans) = true;
6145         nft_trans_obj_newobj(trans) = newobj;
6146         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6147
6148         return 0;
6149
6150 err_free_trans:
6151         kfree(trans);
6152         return err;
6153 }
6154
6155 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
6156                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6157                             const struct nlattr * const nla[],
6158                             struct netlink_ext_ack *extack)
6159 {
6160         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6161         const struct nft_object_type *type;
6162         u8 genmask = nft_genmask_next(net);
6163         int family = nfmsg->nfgen_family;
6164         struct nft_table *table;
6165         struct nft_object *obj;
6166         struct nft_ctx ctx;
6167         u32 objtype;
6168         int err;
6169
6170         if (!nla[NFTA_OBJ_TYPE] ||
6171             !nla[NFTA_OBJ_NAME] ||
6172             !nla[NFTA_OBJ_DATA])
6173                 return -EINVAL;
6174
6175         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6176                                  NETLINK_CB(skb).portid);
6177         if (IS_ERR(table)) {
6178                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6179                 return PTR_ERR(table);
6180         }
6181
6182         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6183         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6184         if (IS_ERR(obj)) {
6185                 err = PTR_ERR(obj);
6186                 if (err != -ENOENT) {
6187                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6188                         return err;
6189                 }
6190         } else {
6191                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6192                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6193                         return -EEXIST;
6194                 }
6195                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
6196                         return -EOPNOTSUPP;
6197
6198                 type = __nft_obj_type_get(objtype);
6199                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6200
6201                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6202         }
6203
6204         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6205
6206         type = nft_obj_type_get(net, objtype);
6207         if (IS_ERR(type))
6208                 return PTR_ERR(type);
6209
6210         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6211         if (IS_ERR(obj)) {
6212                 err = PTR_ERR(obj);
6213                 goto err_init;
6214         }
6215         obj->key.table = table;
6216         obj->handle = nf_tables_alloc_handle(table);
6217
6218         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6219         if (!obj->key.name) {
6220                 err = -ENOMEM;
6221                 goto err_strdup;
6222         }
6223
6224         if (nla[NFTA_OBJ_USERDATA]) {
6225                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6226                 if (obj->udata == NULL)
6227                         goto err_userdata;
6228
6229                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6230         }
6231
6232         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6233         if (err < 0)
6234                 goto err_trans;
6235
6236         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6237                               nft_objname_ht_params);
6238         if (err < 0)
6239                 goto err_obj_ht;
6240
6241         list_add_tail_rcu(&obj->list, &table->objects);
6242         table->use++;
6243         return 0;
6244 err_obj_ht:
6245         /* queued in transaction log */
6246         INIT_LIST_HEAD(&obj->list);
6247         return err;
6248 err_trans:
6249         kfree(obj->key.name);
6250 err_userdata:
6251         kfree(obj->udata);
6252 err_strdup:
6253         if (obj->ops->destroy)
6254                 obj->ops->destroy(&ctx, obj);
6255         kfree(obj);
6256 err_init:
6257         module_put(type->owner);
6258         return err;
6259 }
6260
6261 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6262                                    u32 portid, u32 seq, int event, u32 flags,
6263                                    int family, const struct nft_table *table,
6264                                    struct nft_object *obj, bool reset)
6265 {
6266         struct nfgenmsg *nfmsg;
6267         struct nlmsghdr *nlh;
6268
6269         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6270         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6271         if (nlh == NULL)
6272                 goto nla_put_failure;
6273
6274         nfmsg = nlmsg_data(nlh);
6275         nfmsg->nfgen_family     = family;
6276         nfmsg->version          = NFNETLINK_V0;
6277         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
6278
6279         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6280             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6281             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6282             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6283             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6284             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6285                          NFTA_OBJ_PAD))
6286                 goto nla_put_failure;
6287
6288         if (obj->udata &&
6289             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6290                 goto nla_put_failure;
6291
6292         nlmsg_end(skb, nlh);
6293         return 0;
6294
6295 nla_put_failure:
6296         nlmsg_trim(skb, nlh);
6297         return -1;
6298 }
6299
6300 struct nft_obj_filter {
6301         char            *table;
6302         u32             type;
6303 };
6304
6305 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6306 {
6307         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6308         const struct nft_table *table;
6309         unsigned int idx = 0, s_idx = cb->args[0];
6310         struct nft_obj_filter *filter = cb->data;
6311         struct net *net = sock_net(skb->sk);
6312         int family = nfmsg->nfgen_family;
6313         struct nft_object *obj;
6314         bool reset = false;
6315
6316         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6317                 reset = true;
6318
6319         rcu_read_lock();
6320         cb->seq = net->nft.base_seq;
6321
6322         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6323                 if (family != NFPROTO_UNSPEC && family != table->family)
6324                         continue;
6325
6326                 list_for_each_entry_rcu(obj, &table->objects, list) {
6327                         if (!nft_is_active(net, obj))
6328                                 goto cont;
6329                         if (idx < s_idx)
6330                                 goto cont;
6331                         if (idx > s_idx)
6332                                 memset(&cb->args[1], 0,
6333                                        sizeof(cb->args) - sizeof(cb->args[0]));
6334                         if (filter && filter->table &&
6335                             strcmp(filter->table, table->name))
6336                                 goto cont;
6337                         if (filter &&
6338                             filter->type != NFT_OBJECT_UNSPEC &&
6339                             obj->ops->type->type != filter->type)
6340                                 goto cont;
6341
6342                         if (reset) {
6343                                 char *buf = kasprintf(GFP_ATOMIC,
6344                                                       "%s:%llu;?:0",
6345                                                       table->name,
6346                                                       table->handle);
6347
6348                                 audit_log_nfcfg(buf,
6349                                                 family,
6350                                                 obj->handle,
6351                                                 AUDIT_NFT_OP_OBJ_RESET,
6352                                                 GFP_ATOMIC);
6353                                 kfree(buf);
6354                         }
6355
6356                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6357                                                     cb->nlh->nlmsg_seq,
6358                                                     NFT_MSG_NEWOBJ,
6359                                                     NLM_F_MULTI | NLM_F_APPEND,
6360                                                     table->family, table,
6361                                                     obj, reset) < 0)
6362                                 goto done;
6363
6364                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6365 cont:
6366                         idx++;
6367                 }
6368         }
6369 done:
6370         rcu_read_unlock();
6371
6372         cb->args[0] = idx;
6373         return skb->len;
6374 }
6375
6376 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6377 {
6378         const struct nlattr * const *nla = cb->data;
6379         struct nft_obj_filter *filter = NULL;
6380
6381         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6382                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6383                 if (!filter)
6384                         return -ENOMEM;
6385
6386                 if (nla[NFTA_OBJ_TABLE]) {
6387                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6388                         if (!filter->table) {
6389                                 kfree(filter);
6390                                 return -ENOMEM;
6391                         }
6392                 }
6393
6394                 if (nla[NFTA_OBJ_TYPE])
6395                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6396         }
6397
6398         cb->data = filter;
6399         return 0;
6400 }
6401
6402 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6403 {
6404         struct nft_obj_filter *filter = cb->data;
6405
6406         if (filter) {
6407                 kfree(filter->table);
6408                 kfree(filter);
6409         }
6410
6411         return 0;
6412 }
6413
6414 /* called with rcu_read_lock held */
6415 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6416                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6417                             const struct nlattr * const nla[],
6418                             struct netlink_ext_ack *extack)
6419 {
6420         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6421         u8 genmask = nft_genmask_cur(net);
6422         int family = nfmsg->nfgen_family;
6423         const struct nft_table *table;
6424         struct nft_object *obj;
6425         struct sk_buff *skb2;
6426         bool reset = false;
6427         u32 objtype;
6428         int err;
6429
6430         if (nlh->nlmsg_flags & NLM_F_DUMP) {
6431                 struct netlink_dump_control c = {
6432                         .start = nf_tables_dump_obj_start,
6433                         .dump = nf_tables_dump_obj,
6434                         .done = nf_tables_dump_obj_done,
6435                         .module = THIS_MODULE,
6436                         .data = (void *)nla,
6437                 };
6438
6439                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6440         }
6441
6442         if (!nla[NFTA_OBJ_NAME] ||
6443             !nla[NFTA_OBJ_TYPE])
6444                 return -EINVAL;
6445
6446         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
6447         if (IS_ERR(table)) {
6448                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6449                 return PTR_ERR(table);
6450         }
6451
6452         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6453         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6454         if (IS_ERR(obj)) {
6455                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6456                 return PTR_ERR(obj);
6457         }
6458
6459         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6460         if (!skb2)
6461                 return -ENOMEM;
6462
6463         if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6464                 reset = true;
6465
6466         if (reset) {
6467                 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
6468                                       table->name, table->handle);
6469
6470                 audit_log_nfcfg(buf,
6471                                 family,
6472                                 obj->handle,
6473                                 AUDIT_NFT_OP_OBJ_RESET,
6474                                 GFP_ATOMIC);
6475                 kfree(buf);
6476         }
6477
6478         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6479                                       nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6480                                       family, table, obj, reset);
6481         if (err < 0)
6482                 goto err_fill_obj_info;
6483
6484         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6485
6486 err_fill_obj_info:
6487         kfree_skb(skb2);
6488         return err;
6489 }
6490
6491 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6492 {
6493         if (obj->ops->destroy)
6494                 obj->ops->destroy(ctx, obj);
6495
6496         module_put(obj->ops->type->owner);
6497         kfree(obj->key.name);
6498         kfree(obj->udata);
6499         kfree(obj);
6500 }
6501
6502 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
6503                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6504                             const struct nlattr * const nla[],
6505                             struct netlink_ext_ack *extack)
6506 {
6507         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6508         u8 genmask = nft_genmask_next(net);
6509         int family = nfmsg->nfgen_family;
6510         const struct nlattr *attr;
6511         struct nft_table *table;
6512         struct nft_object *obj;
6513         struct nft_ctx ctx;
6514         u32 objtype;
6515
6516         if (!nla[NFTA_OBJ_TYPE] ||
6517             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6518                 return -EINVAL;
6519
6520         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6521                                  NETLINK_CB(skb).portid);
6522         if (IS_ERR(table)) {
6523                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6524                 return PTR_ERR(table);
6525         }
6526
6527         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6528         if (nla[NFTA_OBJ_HANDLE]) {
6529                 attr = nla[NFTA_OBJ_HANDLE];
6530                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6531         } else {
6532                 attr = nla[NFTA_OBJ_NAME];
6533                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6534         }
6535
6536         if (IS_ERR(obj)) {
6537                 NL_SET_BAD_ATTR(extack, attr);
6538                 return PTR_ERR(obj);
6539         }
6540         if (obj->use > 0) {
6541                 NL_SET_BAD_ATTR(extack, attr);
6542                 return -EBUSY;
6543         }
6544
6545         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6546
6547         return nft_delobj(&ctx, obj);
6548 }
6549
6550 void nft_obj_notify(struct net *net, const struct nft_table *table,
6551                     struct nft_object *obj, u32 portid, u32 seq, int event,
6552                     int family, int report, gfp_t gfp)
6553 {
6554         struct sk_buff *skb;
6555         int err;
6556         char *buf = kasprintf(gfp, "%s:%llu;?:0",
6557                               table->name, table->handle);
6558
6559         audit_log_nfcfg(buf,
6560                         family,
6561                         obj->handle,
6562                         event == NFT_MSG_NEWOBJ ?
6563                                 AUDIT_NFT_OP_OBJ_REGISTER :
6564                                 AUDIT_NFT_OP_OBJ_UNREGISTER,
6565                         gfp);
6566         kfree(buf);
6567
6568         if (!report &&
6569             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6570                 return;
6571
6572         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6573         if (skb == NULL)
6574                 goto err;
6575
6576         err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6577                                       table, obj, false);
6578         if (err < 0) {
6579                 kfree_skb(skb);
6580                 goto err;
6581         }
6582
6583         nft_notify_enqueue(skb, report, &net->nft.notify_list);
6584         return;
6585 err:
6586         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6587 }
6588 EXPORT_SYMBOL_GPL(nft_obj_notify);
6589
6590 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6591                                  struct nft_object *obj, int event)
6592 {
6593         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6594                        ctx->family, ctx->report, GFP_KERNEL);
6595 }
6596
6597 /*
6598  * Flow tables
6599  */
6600 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6601 {
6602         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6603         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6604         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6605 }
6606 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6607
6608 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6609 {
6610         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6611         list_del_rcu(&type->list);
6612         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6613 }
6614 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6615
6616 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6617         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
6618                                             .len = NFT_NAME_MAXLEN - 1 },
6619         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
6620                                             .len = NFT_NAME_MAXLEN - 1 },
6621         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
6622         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
6623         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
6624 };
6625
6626 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6627                                            const struct nlattr *nla, u8 genmask)
6628 {
6629         struct nft_flowtable *flowtable;
6630
6631         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6632                 if (!nla_strcmp(nla, flowtable->name) &&
6633                     nft_active_genmask(flowtable, genmask))
6634                         return flowtable;
6635         }
6636         return ERR_PTR(-ENOENT);
6637 }
6638 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6639
6640 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6641                                     struct nft_flowtable *flowtable,
6642                                     enum nft_trans_phase phase)
6643 {
6644         switch (phase) {
6645         case NFT_TRANS_PREPARE:
6646         case NFT_TRANS_ABORT:
6647         case NFT_TRANS_RELEASE:
6648                 flowtable->use--;
6649                 fallthrough;
6650         default:
6651                 return;
6652         }
6653 }
6654 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6655
6656 static struct nft_flowtable *
6657 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6658                               const struct nlattr *nla, u8 genmask)
6659 {
6660        struct nft_flowtable *flowtable;
6661
6662        list_for_each_entry(flowtable, &table->flowtables, list) {
6663                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6664                    nft_active_genmask(flowtable, genmask))
6665                        return flowtable;
6666        }
6667        return ERR_PTR(-ENOENT);
6668 }
6669
6670 struct nft_flowtable_hook {
6671         u32                     num;
6672         int                     priority;
6673         struct list_head        list;
6674 };
6675
6676 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6677         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
6678         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
6679         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
6680 };
6681
6682 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6683                                     const struct nlattr *attr,
6684                                     struct nft_flowtable_hook *flowtable_hook,
6685                                     struct nft_flowtable *flowtable, bool add)
6686 {
6687         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6688         struct nft_hook *hook;
6689         int hooknum, priority;
6690         int err;
6691
6692         INIT_LIST_HEAD(&flowtable_hook->list);
6693
6694         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6695                                           nft_flowtable_hook_policy, NULL);
6696         if (err < 0)
6697                 return err;
6698
6699         if (add) {
6700                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6701                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6702                         return -EINVAL;
6703
6704                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6705                 if (hooknum != NF_NETDEV_INGRESS)
6706                         return -EOPNOTSUPP;
6707
6708                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6709
6710                 flowtable_hook->priority        = priority;
6711                 flowtable_hook->num             = hooknum;
6712         } else {
6713                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6714                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6715                         if (hooknum != flowtable->hooknum)
6716                                 return -EOPNOTSUPP;
6717                 }
6718
6719                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6720                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6721                         if (priority != flowtable->data.priority)
6722                                 return -EOPNOTSUPP;
6723                 }
6724
6725                 flowtable_hook->priority        = flowtable->data.priority;
6726                 flowtable_hook->num             = flowtable->hooknum;
6727         }
6728
6729         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6730                 err = nf_tables_parse_netdev_hooks(ctx->net,
6731                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
6732                                                    &flowtable_hook->list);
6733                 if (err < 0)
6734                         return err;
6735         }
6736
6737         list_for_each_entry(hook, &flowtable_hook->list, list) {
6738                 hook->ops.pf            = NFPROTO_NETDEV;
6739                 hook->ops.hooknum       = flowtable_hook->num;
6740                 hook->ops.priority      = flowtable_hook->priority;
6741                 hook->ops.priv          = &flowtable->data;
6742                 hook->ops.hook          = flowtable->data.type->hook;
6743         }
6744
6745         return err;
6746 }
6747
6748 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6749 {
6750         const struct nf_flowtable_type *type;
6751
6752         list_for_each_entry(type, &nf_tables_flowtables, list) {
6753                 if (family == type->family)
6754                         return type;
6755         }
6756         return NULL;
6757 }
6758
6759 static const struct nf_flowtable_type *
6760 nft_flowtable_type_get(struct net *net, u8 family)
6761 {
6762         const struct nf_flowtable_type *type;
6763
6764         type = __nft_flowtable_type_get(family);
6765         if (type != NULL && try_module_get(type->owner))
6766                 return type;
6767
6768         lockdep_nfnl_nft_mutex_not_held();
6769 #ifdef CONFIG_MODULES
6770         if (type == NULL) {
6771                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6772                         return ERR_PTR(-EAGAIN);
6773         }
6774 #endif
6775         return ERR_PTR(-ENOENT);
6776 }
6777
6778 /* Only called from error and netdev event paths. */
6779 static void nft_unregister_flowtable_hook(struct net *net,
6780                                           struct nft_flowtable *flowtable,
6781                                           struct nft_hook *hook)
6782 {
6783         nf_unregister_net_hook(net, &hook->ops);
6784         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6785                                     FLOW_BLOCK_UNBIND);
6786 }
6787
6788 static void nft_unregister_flowtable_net_hooks(struct net *net,
6789                                                struct list_head *hook_list)
6790 {
6791         struct nft_hook *hook;
6792
6793         list_for_each_entry(hook, hook_list, list)
6794                 nf_unregister_net_hook(net, &hook->ops);
6795 }
6796
6797 static int nft_register_flowtable_net_hooks(struct net *net,
6798                                             struct nft_table *table,
6799                                             struct list_head *hook_list,
6800                                             struct nft_flowtable *flowtable)
6801 {
6802         struct nft_hook *hook, *hook2, *next;
6803         struct nft_flowtable *ft;
6804         int err, i = 0;
6805
6806         list_for_each_entry(hook, hook_list, list) {
6807                 list_for_each_entry(ft, &table->flowtables, list) {
6808                         if (!nft_is_active_next(net, ft))
6809                                 continue;
6810
6811                         list_for_each_entry(hook2, &ft->hook_list, list) {
6812                                 if (hook->ops.dev == hook2->ops.dev &&
6813                                     hook->ops.pf == hook2->ops.pf) {
6814                                         err = -EEXIST;
6815                                         goto err_unregister_net_hooks;
6816                                 }
6817                         }
6818                 }
6819
6820                 err = flowtable->data.type->setup(&flowtable->data,
6821                                                   hook->ops.dev,
6822                                                   FLOW_BLOCK_BIND);
6823                 if (err < 0)
6824                         goto err_unregister_net_hooks;
6825
6826                 err = nf_register_net_hook(net, &hook->ops);
6827                 if (err < 0) {
6828                         flowtable->data.type->setup(&flowtable->data,
6829                                                     hook->ops.dev,
6830                                                     FLOW_BLOCK_UNBIND);
6831                         goto err_unregister_net_hooks;
6832                 }
6833
6834                 i++;
6835         }
6836
6837         return 0;
6838
6839 err_unregister_net_hooks:
6840         list_for_each_entry_safe(hook, next, hook_list, list) {
6841                 if (i-- <= 0)
6842                         break;
6843
6844                 nft_unregister_flowtable_hook(net, flowtable, hook);
6845                 list_del_rcu(&hook->list);
6846                 kfree_rcu(hook, rcu);
6847         }
6848
6849         return err;
6850 }
6851
6852 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6853 {
6854         struct nft_hook *hook, *next;
6855
6856         list_for_each_entry_safe(hook, next, hook_list, list) {
6857                 list_del_rcu(&hook->list);
6858                 kfree_rcu(hook, rcu);
6859         }
6860 }
6861
6862 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6863                                 struct nft_flowtable *flowtable)
6864 {
6865         const struct nlattr * const *nla = ctx->nla;
6866         struct nft_flowtable_hook flowtable_hook;
6867         struct nft_hook *hook, *next;
6868         struct nft_trans *trans;
6869         bool unregister = false;
6870         u32 flags;
6871         int err;
6872
6873         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6874                                        &flowtable_hook, flowtable, false);
6875         if (err < 0)
6876                 return err;
6877
6878         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6879                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6880                         list_del(&hook->list);
6881                         kfree(hook);
6882                 }
6883         }
6884
6885         if (nla[NFTA_FLOWTABLE_FLAGS]) {
6886                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6887                 if (flags & ~NFT_FLOWTABLE_MASK)
6888                         return -EOPNOTSUPP;
6889                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
6890                     (flags & NFT_FLOWTABLE_HW_OFFLOAD))
6891                         return -EOPNOTSUPP;
6892         } else {
6893                 flags = flowtable->data.flags;
6894         }
6895
6896         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6897                                                &flowtable_hook.list, flowtable);
6898         if (err < 0)
6899                 goto err_flowtable_update_hook;
6900
6901         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6902                                 sizeof(struct nft_trans_flowtable));
6903         if (!trans) {
6904                 unregister = true;
6905                 err = -ENOMEM;
6906                 goto err_flowtable_update_hook;
6907         }
6908
6909         nft_trans_flowtable_flags(trans) = flags;
6910         nft_trans_flowtable(trans) = flowtable;
6911         nft_trans_flowtable_update(trans) = true;
6912         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6913         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6914
6915         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6916
6917         return 0;
6918
6919 err_flowtable_update_hook:
6920         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6921                 if (unregister)
6922                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6923                 list_del_rcu(&hook->list);
6924                 kfree_rcu(hook, rcu);
6925         }
6926
6927         return err;
6928
6929 }
6930
6931 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6932                                   struct sk_buff *skb,
6933                                   const struct nlmsghdr *nlh,
6934                                   const struct nlattr * const nla[],
6935                                   struct netlink_ext_ack *extack)
6936 {
6937         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6938         struct nft_flowtable_hook flowtable_hook;
6939         const struct nf_flowtable_type *type;
6940         u8 genmask = nft_genmask_next(net);
6941         int family = nfmsg->nfgen_family;
6942         struct nft_flowtable *flowtable;
6943         struct nft_hook *hook, *next;
6944         struct nft_table *table;
6945         struct nft_ctx ctx;
6946         int err;
6947
6948         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6949             !nla[NFTA_FLOWTABLE_NAME] ||
6950             !nla[NFTA_FLOWTABLE_HOOK])
6951                 return -EINVAL;
6952
6953         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6954                                  genmask, NETLINK_CB(skb).portid);
6955         if (IS_ERR(table)) {
6956                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6957                 return PTR_ERR(table);
6958         }
6959
6960         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6961                                          genmask);
6962         if (IS_ERR(flowtable)) {
6963                 err = PTR_ERR(flowtable);
6964                 if (err != -ENOENT) {
6965                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6966                         return err;
6967                 }
6968         } else {
6969                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6970                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6971                         return -EEXIST;
6972                 }
6973
6974                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6975
6976                 return nft_flowtable_update(&ctx, nlh, flowtable);
6977         }
6978
6979         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6980
6981         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6982         if (!flowtable)
6983                 return -ENOMEM;
6984
6985         flowtable->table = table;
6986         flowtable->handle = nf_tables_alloc_handle(table);
6987         INIT_LIST_HEAD(&flowtable->hook_list);
6988
6989         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6990         if (!flowtable->name) {
6991                 err = -ENOMEM;
6992                 goto err1;
6993         }
6994
6995         type = nft_flowtable_type_get(net, family);
6996         if (IS_ERR(type)) {
6997                 err = PTR_ERR(type);
6998                 goto err2;
6999         }
7000
7001         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7002                 flowtable->data.flags =
7003                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7004                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7005                         err = -EOPNOTSUPP;
7006                         goto err3;
7007                 }
7008         }
7009
7010         write_pnet(&flowtable->data.net, net);
7011         flowtable->data.type = type;
7012         err = type->init(&flowtable->data);
7013         if (err < 0)
7014                 goto err3;
7015
7016         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7017                                        &flowtable_hook, flowtable, true);
7018         if (err < 0)
7019                 goto err4;
7020
7021         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7022         flowtable->data.priority = flowtable_hook.priority;
7023         flowtable->hooknum = flowtable_hook.num;
7024
7025         err = nft_register_flowtable_net_hooks(ctx.net, table,
7026                                                &flowtable->hook_list,
7027                                                flowtable);
7028         if (err < 0) {
7029                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7030                 goto err4;
7031         }
7032
7033         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7034         if (err < 0)
7035                 goto err5;
7036
7037         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7038         table->use++;
7039
7040         return 0;
7041 err5:
7042         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7043                 nft_unregister_flowtable_hook(net, flowtable, hook);
7044                 list_del_rcu(&hook->list);
7045                 kfree_rcu(hook, rcu);
7046         }
7047 err4:
7048         flowtable->data.type->free(&flowtable->data);
7049 err3:
7050         module_put(type->owner);
7051 err2:
7052         kfree(flowtable->name);
7053 err1:
7054         kfree(flowtable);
7055         return err;
7056 }
7057
7058 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7059 {
7060         struct nft_hook *this, *next;
7061
7062         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7063                 list_del(&this->list);
7064                 kfree(this);
7065         }
7066 }
7067
7068 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7069                                  struct nft_flowtable *flowtable)
7070 {
7071         const struct nlattr * const *nla = ctx->nla;
7072         struct nft_flowtable_hook flowtable_hook;
7073         struct nft_hook *this, *hook;
7074         struct nft_trans *trans;
7075         int err;
7076
7077         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7078                                        &flowtable_hook, flowtable, false);
7079         if (err < 0)
7080                 return err;
7081
7082         list_for_each_entry(this, &flowtable_hook.list, list) {
7083                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7084                 if (!hook) {
7085                         err = -ENOENT;
7086                         goto err_flowtable_del_hook;
7087                 }
7088                 hook->inactive = true;
7089         }
7090
7091         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7092                                 sizeof(struct nft_trans_flowtable));
7093         if (!trans) {
7094                 err = -ENOMEM;
7095                 goto err_flowtable_del_hook;
7096         }
7097
7098         nft_trans_flowtable(trans) = flowtable;
7099         nft_trans_flowtable_update(trans) = true;
7100         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7101         nft_flowtable_hook_release(&flowtable_hook);
7102
7103         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
7104
7105         return 0;
7106
7107 err_flowtable_del_hook:
7108         list_for_each_entry(this, &flowtable_hook.list, list) {
7109                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7110                 if (!hook)
7111                         break;
7112
7113                 hook->inactive = false;
7114         }
7115         nft_flowtable_hook_release(&flowtable_hook);
7116
7117         return err;
7118 }
7119
7120 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
7121                                   struct sk_buff *skb,
7122                                   const struct nlmsghdr *nlh,
7123                                   const struct nlattr * const nla[],
7124                                   struct netlink_ext_ack *extack)
7125 {
7126         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7127         u8 genmask = nft_genmask_next(net);
7128         int family = nfmsg->nfgen_family;
7129         struct nft_flowtable *flowtable;
7130         const struct nlattr *attr;
7131         struct nft_table *table;
7132         struct nft_ctx ctx;
7133
7134         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7135             (!nla[NFTA_FLOWTABLE_NAME] &&
7136              !nla[NFTA_FLOWTABLE_HANDLE]))
7137                 return -EINVAL;
7138
7139         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7140                                  genmask, NETLINK_CB(skb).portid);
7141         if (IS_ERR(table)) {
7142                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7143                 return PTR_ERR(table);
7144         }
7145
7146         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7147                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7148                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7149         } else {
7150                 attr = nla[NFTA_FLOWTABLE_NAME];
7151                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7152         }
7153
7154         if (IS_ERR(flowtable)) {
7155                 NL_SET_BAD_ATTR(extack, attr);
7156                 return PTR_ERR(flowtable);
7157         }
7158
7159         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
7160
7161         if (nla[NFTA_FLOWTABLE_HOOK])
7162                 return nft_delflowtable_hook(&ctx, flowtable);
7163
7164         if (flowtable->use > 0) {
7165                 NL_SET_BAD_ATTR(extack, attr);
7166                 return -EBUSY;
7167         }
7168
7169         return nft_delflowtable(&ctx, flowtable);
7170 }
7171
7172 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7173                                          u32 portid, u32 seq, int event,
7174                                          u32 flags, int family,
7175                                          struct nft_flowtable *flowtable,
7176                                          struct list_head *hook_list)
7177 {
7178         struct nlattr *nest, *nest_devs;
7179         struct nfgenmsg *nfmsg;
7180         struct nft_hook *hook;
7181         struct nlmsghdr *nlh;
7182
7183         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7184         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
7185         if (nlh == NULL)
7186                 goto nla_put_failure;
7187
7188         nfmsg = nlmsg_data(nlh);
7189         nfmsg->nfgen_family     = family;
7190         nfmsg->version          = NFNETLINK_V0;
7191         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7192
7193         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7194             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7195             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7196             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7197                          NFTA_FLOWTABLE_PAD) ||
7198             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7199                 goto nla_put_failure;
7200
7201         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7202         if (!nest)
7203                 goto nla_put_failure;
7204         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7205             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7206                 goto nla_put_failure;
7207
7208         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7209         if (!nest_devs)
7210                 goto nla_put_failure;
7211
7212         list_for_each_entry_rcu(hook, hook_list, list) {
7213                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7214                         goto nla_put_failure;
7215         }
7216         nla_nest_end(skb, nest_devs);
7217         nla_nest_end(skb, nest);
7218
7219         nlmsg_end(skb, nlh);
7220         return 0;
7221
7222 nla_put_failure:
7223         nlmsg_trim(skb, nlh);
7224         return -1;
7225 }
7226
7227 struct nft_flowtable_filter {
7228         char            *table;
7229 };
7230
7231 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7232                                     struct netlink_callback *cb)
7233 {
7234         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7235         struct nft_flowtable_filter *filter = cb->data;
7236         unsigned int idx = 0, s_idx = cb->args[0];
7237         struct net *net = sock_net(skb->sk);
7238         int family = nfmsg->nfgen_family;
7239         struct nft_flowtable *flowtable;
7240         const struct nft_table *table;
7241
7242         rcu_read_lock();
7243         cb->seq = net->nft.base_seq;
7244
7245         list_for_each_entry_rcu(table, &net->nft.tables, list) {
7246                 if (family != NFPROTO_UNSPEC && family != table->family)
7247                         continue;
7248
7249                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7250                         if (!nft_is_active(net, flowtable))
7251                                 goto cont;
7252                         if (idx < s_idx)
7253                                 goto cont;
7254                         if (idx > s_idx)
7255                                 memset(&cb->args[1], 0,
7256                                        sizeof(cb->args) - sizeof(cb->args[0]));
7257                         if (filter && filter->table &&
7258                             strcmp(filter->table, table->name))
7259                                 goto cont;
7260
7261                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7262                                                           cb->nlh->nlmsg_seq,
7263                                                           NFT_MSG_NEWFLOWTABLE,
7264                                                           NLM_F_MULTI | NLM_F_APPEND,
7265                                                           table->family,
7266                                                           flowtable,
7267                                                           &flowtable->hook_list) < 0)
7268                                 goto done;
7269
7270                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7271 cont:
7272                         idx++;
7273                 }
7274         }
7275 done:
7276         rcu_read_unlock();
7277
7278         cb->args[0] = idx;
7279         return skb->len;
7280 }
7281
7282 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7283 {
7284         const struct nlattr * const *nla = cb->data;
7285         struct nft_flowtable_filter *filter = NULL;
7286
7287         if (nla[NFTA_FLOWTABLE_TABLE]) {
7288                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7289                 if (!filter)
7290                         return -ENOMEM;
7291
7292                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7293                                            GFP_ATOMIC);
7294                 if (!filter->table) {
7295                         kfree(filter);
7296                         return -ENOMEM;
7297                 }
7298         }
7299
7300         cb->data = filter;
7301         return 0;
7302 }
7303
7304 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7305 {
7306         struct nft_flowtable_filter *filter = cb->data;
7307
7308         if (!filter)
7309                 return 0;
7310
7311         kfree(filter->table);
7312         kfree(filter);
7313
7314         return 0;
7315 }
7316
7317 /* called with rcu_read_lock held */
7318 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
7319                                   struct sk_buff *skb,
7320                                   const struct nlmsghdr *nlh,
7321                                   const struct nlattr * const nla[],
7322                                   struct netlink_ext_ack *extack)
7323 {
7324         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7325         u8 genmask = nft_genmask_cur(net);
7326         int family = nfmsg->nfgen_family;
7327         struct nft_flowtable *flowtable;
7328         const struct nft_table *table;
7329         struct sk_buff *skb2;
7330         int err;
7331
7332         if (nlh->nlmsg_flags & NLM_F_DUMP) {
7333                 struct netlink_dump_control c = {
7334                         .start = nf_tables_dump_flowtable_start,
7335                         .dump = nf_tables_dump_flowtable,
7336                         .done = nf_tables_dump_flowtable_done,
7337                         .module = THIS_MODULE,
7338                         .data = (void *)nla,
7339                 };
7340
7341                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
7342         }
7343
7344         if (!nla[NFTA_FLOWTABLE_NAME])
7345                 return -EINVAL;
7346
7347         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7348                                  genmask, 0);
7349         if (IS_ERR(table))
7350                 return PTR_ERR(table);
7351
7352         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7353                                          genmask);
7354         if (IS_ERR(flowtable))
7355                 return PTR_ERR(flowtable);
7356
7357         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7358         if (!skb2)
7359                 return -ENOMEM;
7360
7361         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7362                                             nlh->nlmsg_seq,
7363                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7364                                             flowtable, &flowtable->hook_list);
7365         if (err < 0)
7366                 goto err_fill_flowtable_info;
7367
7368         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7369
7370 err_fill_flowtable_info:
7371         kfree_skb(skb2);
7372         return err;
7373 }
7374
7375 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7376                                        struct nft_flowtable *flowtable,
7377                                        struct list_head *hook_list,
7378                                        int event)
7379 {
7380         struct sk_buff *skb;
7381         int err;
7382         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7383                               flowtable->table->name, flowtable->table->handle,
7384                               flowtable->name, flowtable->handle);
7385
7386         audit_log_nfcfg(buf,
7387                         ctx->family,
7388                         flowtable->hooknum,
7389                         event == NFT_MSG_NEWFLOWTABLE ?
7390                                 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
7391                                 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7392                         GFP_KERNEL);
7393         kfree(buf);
7394
7395         if (!ctx->report &&
7396             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7397                 return;
7398
7399         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7400         if (skb == NULL)
7401                 goto err;
7402
7403         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7404                                             ctx->seq, event, 0,
7405                                             ctx->family, flowtable, hook_list);
7406         if (err < 0) {
7407                 kfree_skb(skb);
7408                 goto err;
7409         }
7410
7411         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
7412         return;
7413 err:
7414         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7415 }
7416
7417 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7418 {
7419         struct nft_hook *hook, *next;
7420
7421         flowtable->data.type->free(&flowtable->data);
7422         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7423                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7424                                             FLOW_BLOCK_UNBIND);
7425                 list_del_rcu(&hook->list);
7426                 kfree(hook);
7427         }
7428         kfree(flowtable->name);
7429         module_put(flowtable->data.type->owner);
7430         kfree(flowtable);
7431 }
7432
7433 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7434                                    u32 portid, u32 seq)
7435 {
7436         struct nlmsghdr *nlh;
7437         struct nfgenmsg *nfmsg;
7438         char buf[TASK_COMM_LEN];
7439         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7440
7441         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7442         if (nlh == NULL)
7443                 goto nla_put_failure;
7444
7445         nfmsg = nlmsg_data(nlh);
7446         nfmsg->nfgen_family     = AF_UNSPEC;
7447         nfmsg->version          = NFNETLINK_V0;
7448         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7449
7450         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7451             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7452             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7453                 goto nla_put_failure;
7454
7455         nlmsg_end(skb, nlh);
7456         return 0;
7457
7458 nla_put_failure:
7459         nlmsg_trim(skb, nlh);
7460         return -EMSGSIZE;
7461 }
7462
7463 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7464                                 struct nft_flowtable *flowtable)
7465 {
7466         struct nft_hook *hook;
7467
7468         list_for_each_entry(hook, &flowtable->hook_list, list) {
7469                 if (hook->ops.dev != dev)
7470                         continue;
7471
7472                 /* flow_offload_netdev_event() cleans up entries for us. */
7473                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7474                 list_del_rcu(&hook->list);
7475                 kfree_rcu(hook, rcu);
7476                 break;
7477         }
7478 }
7479
7480 static int nf_tables_flowtable_event(struct notifier_block *this,
7481                                      unsigned long event, void *ptr)
7482 {
7483         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7484         struct nft_flowtable *flowtable;
7485         struct nft_table *table;
7486         struct net *net;
7487
7488         if (event != NETDEV_UNREGISTER)
7489                 return 0;
7490
7491         net = dev_net(dev);
7492         mutex_lock(&net->nft.commit_mutex);
7493         list_for_each_entry(table, &net->nft.tables, list) {
7494                 list_for_each_entry(flowtable, &table->flowtables, list) {
7495                         nft_flowtable_event(event, dev, flowtable);
7496                 }
7497         }
7498         mutex_unlock(&net->nft.commit_mutex);
7499
7500         return NOTIFY_DONE;
7501 }
7502
7503 static struct notifier_block nf_tables_flowtable_notifier = {
7504         .notifier_call  = nf_tables_flowtable_event,
7505 };
7506
7507 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7508                                  int event)
7509 {
7510         struct nlmsghdr *nlh = nlmsg_hdr(skb);
7511         struct sk_buff *skb2;
7512         int err;
7513
7514         audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
7515                         AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
7516
7517         if (!nlmsg_report(nlh) &&
7518             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7519                 return;
7520
7521         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7522         if (skb2 == NULL)
7523                 goto err;
7524
7525         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7526                                       nlh->nlmsg_seq);
7527         if (err < 0) {
7528                 kfree_skb(skb2);
7529                 goto err;
7530         }
7531
7532         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7533                        nlmsg_report(nlh), GFP_KERNEL);
7534         return;
7535 err:
7536         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7537                           -ENOBUFS);
7538 }
7539
7540 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7541                             struct sk_buff *skb, const struct nlmsghdr *nlh,
7542                             const struct nlattr * const nla[],
7543                             struct netlink_ext_ack *extack)
7544 {
7545         struct sk_buff *skb2;
7546         int err;
7547
7548         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7549         if (skb2 == NULL)
7550                 return -ENOMEM;
7551
7552         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7553                                       nlh->nlmsg_seq);
7554         if (err < 0)
7555                 goto err_fill_gen_info;
7556
7557         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7558
7559 err_fill_gen_info:
7560         kfree_skb(skb2);
7561         return err;
7562 }
7563
7564 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7565         [NFT_MSG_NEWTABLE] = {
7566                 .call_batch     = nf_tables_newtable,
7567                 .attr_count     = NFTA_TABLE_MAX,
7568                 .policy         = nft_table_policy,
7569         },
7570         [NFT_MSG_GETTABLE] = {
7571                 .call_rcu       = nf_tables_gettable,
7572                 .attr_count     = NFTA_TABLE_MAX,
7573                 .policy         = nft_table_policy,
7574         },
7575         [NFT_MSG_DELTABLE] = {
7576                 .call_batch     = nf_tables_deltable,
7577                 .attr_count     = NFTA_TABLE_MAX,
7578                 .policy         = nft_table_policy,
7579         },
7580         [NFT_MSG_NEWCHAIN] = {
7581                 .call_batch     = nf_tables_newchain,
7582                 .attr_count     = NFTA_CHAIN_MAX,
7583                 .policy         = nft_chain_policy,
7584         },
7585         [NFT_MSG_GETCHAIN] = {
7586                 .call_rcu       = nf_tables_getchain,
7587                 .attr_count     = NFTA_CHAIN_MAX,
7588                 .policy         = nft_chain_policy,
7589         },
7590         [NFT_MSG_DELCHAIN] = {
7591                 .call_batch     = nf_tables_delchain,
7592                 .attr_count     = NFTA_CHAIN_MAX,
7593                 .policy         = nft_chain_policy,
7594         },
7595         [NFT_MSG_NEWRULE] = {
7596                 .call_batch     = nf_tables_newrule,
7597                 .attr_count     = NFTA_RULE_MAX,
7598                 .policy         = nft_rule_policy,
7599         },
7600         [NFT_MSG_GETRULE] = {
7601                 .call_rcu       = nf_tables_getrule,
7602                 .attr_count     = NFTA_RULE_MAX,
7603                 .policy         = nft_rule_policy,
7604         },
7605         [NFT_MSG_DELRULE] = {
7606                 .call_batch     = nf_tables_delrule,
7607                 .attr_count     = NFTA_RULE_MAX,
7608                 .policy         = nft_rule_policy,
7609         },
7610         [NFT_MSG_NEWSET] = {
7611                 .call_batch     = nf_tables_newset,
7612                 .attr_count     = NFTA_SET_MAX,
7613                 .policy         = nft_set_policy,
7614         },
7615         [NFT_MSG_GETSET] = {
7616                 .call_rcu       = nf_tables_getset,
7617                 .attr_count     = NFTA_SET_MAX,
7618                 .policy         = nft_set_policy,
7619         },
7620         [NFT_MSG_DELSET] = {
7621                 .call_batch     = nf_tables_delset,
7622                 .attr_count     = NFTA_SET_MAX,
7623                 .policy         = nft_set_policy,
7624         },
7625         [NFT_MSG_NEWSETELEM] = {
7626                 .call_batch     = nf_tables_newsetelem,
7627                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7628                 .policy         = nft_set_elem_list_policy,
7629         },
7630         [NFT_MSG_GETSETELEM] = {
7631                 .call_rcu       = nf_tables_getsetelem,
7632                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7633                 .policy         = nft_set_elem_list_policy,
7634         },
7635         [NFT_MSG_DELSETELEM] = {
7636                 .call_batch     = nf_tables_delsetelem,
7637                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7638                 .policy         = nft_set_elem_list_policy,
7639         },
7640         [NFT_MSG_GETGEN] = {
7641                 .call_rcu       = nf_tables_getgen,
7642         },
7643         [NFT_MSG_NEWOBJ] = {
7644                 .call_batch     = nf_tables_newobj,
7645                 .attr_count     = NFTA_OBJ_MAX,
7646                 .policy         = nft_obj_policy,
7647         },
7648         [NFT_MSG_GETOBJ] = {
7649                 .call_rcu       = nf_tables_getobj,
7650                 .attr_count     = NFTA_OBJ_MAX,
7651                 .policy         = nft_obj_policy,
7652         },
7653         [NFT_MSG_DELOBJ] = {
7654                 .call_batch     = nf_tables_delobj,
7655                 .attr_count     = NFTA_OBJ_MAX,
7656                 .policy         = nft_obj_policy,
7657         },
7658         [NFT_MSG_GETOBJ_RESET] = {
7659                 .call_rcu       = nf_tables_getobj,
7660                 .attr_count     = NFTA_OBJ_MAX,
7661                 .policy         = nft_obj_policy,
7662         },
7663         [NFT_MSG_NEWFLOWTABLE] = {
7664                 .call_batch     = nf_tables_newflowtable,
7665                 .attr_count     = NFTA_FLOWTABLE_MAX,
7666                 .policy         = nft_flowtable_policy,
7667         },
7668         [NFT_MSG_GETFLOWTABLE] = {
7669                 .call_rcu       = nf_tables_getflowtable,
7670                 .attr_count     = NFTA_FLOWTABLE_MAX,
7671                 .policy         = nft_flowtable_policy,
7672         },
7673         [NFT_MSG_DELFLOWTABLE] = {
7674                 .call_batch     = nf_tables_delflowtable,
7675                 .attr_count     = NFTA_FLOWTABLE_MAX,
7676                 .policy         = nft_flowtable_policy,
7677         },
7678 };
7679
7680 static int nf_tables_validate(struct net *net)
7681 {
7682         struct nft_table *table;
7683
7684         switch (net->nft.validate_state) {
7685         case NFT_VALIDATE_SKIP:
7686                 break;
7687         case NFT_VALIDATE_NEED:
7688                 nft_validate_state_update(net, NFT_VALIDATE_DO);
7689                 fallthrough;
7690         case NFT_VALIDATE_DO:
7691                 list_for_each_entry(table, &net->nft.tables, list) {
7692                         if (nft_table_validate(net, table) < 0)
7693                                 return -EAGAIN;
7694                 }
7695                 break;
7696         }
7697
7698         return 0;
7699 }
7700
7701 /* a drop policy has to be deferred until all rules have been activated,
7702  * otherwise a large ruleset that contains a drop-policy base chain will
7703  * cause all packets to get dropped until the full transaction has been
7704  * processed.
7705  *
7706  * We defer the drop policy until the transaction has been finalized.
7707  */
7708 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7709 {
7710         struct nft_base_chain *basechain;
7711
7712         if (nft_trans_chain_policy(trans) != NF_DROP)
7713                 return;
7714
7715         if (!nft_is_base_chain(trans->ctx.chain))
7716                 return;
7717
7718         basechain = nft_base_chain(trans->ctx.chain);
7719         basechain->policy = NF_DROP;
7720 }
7721
7722 static void nft_chain_commit_update(struct nft_trans *trans)
7723 {
7724         struct nft_base_chain *basechain;
7725
7726         if (nft_trans_chain_name(trans)) {
7727                 rhltable_remove(&trans->ctx.table->chains_ht,
7728                                 &trans->ctx.chain->rhlhead,
7729                                 nft_chain_ht_params);
7730                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
7731                 rhltable_insert_key(&trans->ctx.table->chains_ht,
7732                                     trans->ctx.chain->name,
7733                                     &trans->ctx.chain->rhlhead,
7734                                     nft_chain_ht_params);
7735         }
7736
7737         if (!nft_is_base_chain(trans->ctx.chain))
7738                 return;
7739
7740         nft_chain_stats_replace(trans);
7741
7742         basechain = nft_base_chain(trans->ctx.chain);
7743
7744         switch (nft_trans_chain_policy(trans)) {
7745         case NF_DROP:
7746         case NF_ACCEPT:
7747                 basechain->policy = nft_trans_chain_policy(trans);
7748                 break;
7749         }
7750 }
7751
7752 static void nft_obj_commit_update(struct nft_trans *trans)
7753 {
7754         struct nft_object *newobj;
7755         struct nft_object *obj;
7756
7757         obj = nft_trans_obj(trans);
7758         newobj = nft_trans_obj_newobj(trans);
7759
7760         if (obj->ops->update)
7761                 obj->ops->update(obj, newobj);
7762
7763         kfree(newobj);
7764 }
7765
7766 static void nft_commit_release(struct nft_trans *trans)
7767 {
7768         switch (trans->msg_type) {
7769         case NFT_MSG_DELTABLE:
7770                 nf_tables_table_destroy(&trans->ctx);
7771                 break;
7772         case NFT_MSG_NEWCHAIN:
7773                 free_percpu(nft_trans_chain_stats(trans));
7774                 kfree(nft_trans_chain_name(trans));
7775                 break;
7776         case NFT_MSG_DELCHAIN:
7777                 nf_tables_chain_destroy(&trans->ctx);
7778                 break;
7779         case NFT_MSG_DELRULE:
7780                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7781                 break;
7782         case NFT_MSG_DELSET:
7783                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7784                 break;
7785         case NFT_MSG_DELSETELEM:
7786                 nf_tables_set_elem_destroy(&trans->ctx,
7787                                            nft_trans_elem_set(trans),
7788                                            nft_trans_elem(trans).priv);
7789                 break;
7790         case NFT_MSG_DELOBJ:
7791                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7792                 break;
7793         case NFT_MSG_DELFLOWTABLE:
7794                 if (nft_trans_flowtable_update(trans))
7795                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7796                 else
7797                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7798                 break;
7799         }
7800
7801         if (trans->put_net)
7802                 put_net(trans->ctx.net);
7803
7804         kfree(trans);
7805 }
7806
7807 static void nf_tables_trans_destroy_work(struct work_struct *w)
7808 {
7809         struct nft_trans *trans, *next;
7810         LIST_HEAD(head);
7811
7812         spin_lock(&nf_tables_destroy_list_lock);
7813         list_splice_init(&nf_tables_destroy_list, &head);
7814         spin_unlock(&nf_tables_destroy_list_lock);
7815
7816         if (list_empty(&head))
7817                 return;
7818
7819         synchronize_rcu();
7820
7821         list_for_each_entry_safe(trans, next, &head, list) {
7822                 list_del(&trans->list);
7823                 nft_commit_release(trans);
7824         }
7825 }
7826
7827 void nf_tables_trans_destroy_flush_work(void)
7828 {
7829         flush_work(&trans_destroy_work);
7830 }
7831 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7832
7833 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7834 {
7835         struct nft_rule *rule;
7836         unsigned int alloc = 0;
7837         int i;
7838
7839         /* already handled or inactive chain? */
7840         if (chain->rules_next || !nft_is_active_next(net, chain))
7841                 return 0;
7842
7843         rule = list_entry(&chain->rules, struct nft_rule, list);
7844         i = 0;
7845
7846         list_for_each_entry_continue(rule, &chain->rules, list) {
7847                 if (nft_is_active_next(net, rule))
7848                         alloc++;
7849         }
7850
7851         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7852         if (!chain->rules_next)
7853                 return -ENOMEM;
7854
7855         list_for_each_entry_continue(rule, &chain->rules, list) {
7856                 if (nft_is_active_next(net, rule))
7857                         chain->rules_next[i++] = rule;
7858         }
7859
7860         chain->rules_next[i] = NULL;
7861         return 0;
7862 }
7863
7864 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7865 {
7866         struct nft_trans *trans, *next;
7867
7868         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7869                 struct nft_chain *chain = trans->ctx.chain;
7870
7871                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7872                     trans->msg_type == NFT_MSG_DELRULE) {
7873                         kvfree(chain->rules_next);
7874                         chain->rules_next = NULL;
7875                 }
7876         }
7877 }
7878
7879 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7880 {
7881         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7882
7883         kvfree(o->start);
7884 }
7885
7886 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7887 {
7888         struct nft_rule **r = rules;
7889         struct nft_rules_old *old;
7890
7891         while (*r)
7892                 r++;
7893
7894         r++;    /* rcu_head is after end marker */
7895         old = (void *) r;
7896         old->start = rules;
7897
7898         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7899 }
7900
7901 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7902 {
7903         struct nft_rule **g0, **g1;
7904         bool next_genbit;
7905
7906         next_genbit = nft_gencursor_next(net);
7907
7908         g0 = rcu_dereference_protected(chain->rules_gen_0,
7909                                        lockdep_commit_lock_is_held(net));
7910         g1 = rcu_dereference_protected(chain->rules_gen_1,
7911                                        lockdep_commit_lock_is_held(net));
7912
7913         /* No changes to this chain? */
7914         if (chain->rules_next == NULL) {
7915                 /* chain had no change in last or next generation */
7916                 if (g0 == g1)
7917                         return;
7918                 /*
7919                  * chain had no change in this generation; make sure next
7920                  * one uses same rules as current generation.
7921                  */
7922                 if (next_genbit) {
7923                         rcu_assign_pointer(chain->rules_gen_1, g0);
7924                         nf_tables_commit_chain_free_rules_old(g1);
7925                 } else {
7926                         rcu_assign_pointer(chain->rules_gen_0, g1);
7927                         nf_tables_commit_chain_free_rules_old(g0);
7928                 }
7929
7930                 return;
7931         }
7932
7933         if (next_genbit)
7934                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7935         else
7936                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7937
7938         chain->rules_next = NULL;
7939
7940         if (g0 == g1)
7941                 return;
7942
7943         if (next_genbit)
7944                 nf_tables_commit_chain_free_rules_old(g1);
7945         else
7946                 nf_tables_commit_chain_free_rules_old(g0);
7947 }
7948
7949 static void nft_obj_del(struct nft_object *obj)
7950 {
7951         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7952         list_del_rcu(&obj->list);
7953 }
7954
7955 void nft_chain_del(struct nft_chain *chain)
7956 {
7957         struct nft_table *table = chain->table;
7958
7959         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7960                                      nft_chain_ht_params));
7961         list_del_rcu(&chain->list);
7962 }
7963
7964 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7965                                     struct list_head *hook_list)
7966 {
7967         struct nft_hook *hook, *next;
7968
7969         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7970                 if (hook->inactive)
7971                         list_move(&hook->list, hook_list);
7972         }
7973 }
7974
7975 static void nf_tables_module_autoload_cleanup(struct net *net)
7976 {
7977         struct nft_module_request *req, *next;
7978
7979         WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7980         list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7981                 WARN_ON_ONCE(!req->done);
7982                 list_del(&req->list);
7983                 kfree(req);
7984         }
7985 }
7986
7987 static void nf_tables_commit_release(struct net *net)
7988 {
7989         struct nft_trans *trans;
7990
7991         /* all side effects have to be made visible.
7992          * For example, if a chain named 'foo' has been deleted, a
7993          * new transaction must not find it anymore.
7994          *
7995          * Memory reclaim happens asynchronously from work queue
7996          * to prevent expensive synchronize_rcu() in commit phase.
7997          */
7998         if (list_empty(&net->nft.commit_list)) {
7999                 nf_tables_module_autoload_cleanup(net);
8000                 mutex_unlock(&net->nft.commit_mutex);
8001                 return;
8002         }
8003
8004         trans = list_last_entry(&net->nft.commit_list,
8005                                 struct nft_trans, list);
8006         get_net(trans->ctx.net);
8007         WARN_ON_ONCE(trans->put_net);
8008
8009         trans->put_net = true;
8010         spin_lock(&nf_tables_destroy_list_lock);
8011         list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
8012         spin_unlock(&nf_tables_destroy_list_lock);
8013
8014         nf_tables_module_autoload_cleanup(net);
8015         schedule_work(&trans_destroy_work);
8016
8017         mutex_unlock(&net->nft.commit_mutex);
8018 }
8019
8020 static void nft_commit_notify(struct net *net, u32 portid)
8021 {
8022         struct sk_buff *batch_skb = NULL, *nskb, *skb;
8023         unsigned char *data;
8024         int len;
8025
8026         list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) {
8027                 if (!batch_skb) {
8028 new_batch:
8029                         batch_skb = skb;
8030                         len = NLMSG_GOODSIZE - skb->len;
8031                         list_del(&skb->list);
8032                         continue;
8033                 }
8034                 len -= skb->len;
8035                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8036                         data = skb_put(batch_skb, skb->len);
8037                         memcpy(data, skb->data, skb->len);
8038                         list_del(&skb->list);
8039                         kfree_skb(skb);
8040                         continue;
8041                 }
8042                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8043                                NFT_CB(batch_skb).report, GFP_KERNEL);
8044                 goto new_batch;
8045         }
8046
8047         if (batch_skb) {
8048                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8049                                NFT_CB(batch_skb).report, GFP_KERNEL);
8050         }
8051
8052         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
8053 }
8054
8055 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8056 {
8057         struct nft_trans *trans, *next;
8058         struct nft_trans_elem *te;
8059         struct nft_chain *chain;
8060         struct nft_table *table;
8061         int err;
8062
8063         if (list_empty(&net->nft.commit_list)) {
8064                 mutex_unlock(&net->nft.commit_mutex);
8065                 return 0;
8066         }
8067
8068         /* 0. Validate ruleset, otherwise roll back for error reporting. */
8069         if (nf_tables_validate(net) < 0)
8070                 return -EAGAIN;
8071
8072         err = nft_flow_rule_offload_commit(net);
8073         if (err < 0)
8074                 return err;
8075
8076         /* 1.  Allocate space for next generation rules_gen_X[] */
8077         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
8078                 int ret;
8079
8080                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8081                     trans->msg_type == NFT_MSG_DELRULE) {
8082                         chain = trans->ctx.chain;
8083
8084                         ret = nf_tables_commit_chain_prepare(net, chain);
8085                         if (ret < 0) {
8086                                 nf_tables_commit_chain_prepare_cancel(net);
8087                                 return ret;
8088                         }
8089                 }
8090         }
8091
8092         /* step 2.  Make rules_gen_X visible to packet path */
8093         list_for_each_entry(table, &net->nft.tables, list) {
8094                 list_for_each_entry(chain, &table->chains, list)
8095                         nf_tables_commit_chain(net, chain);
8096         }
8097
8098         /*
8099          * Bump generation counter, invalidate any dump in progress.
8100          * Cannot fail after this point.
8101          */
8102         while (++net->nft.base_seq == 0);
8103
8104         /* step 3. Start new generation, rules_gen_X now in use. */
8105         net->nft.gencursor = nft_gencursor_next(net);
8106
8107         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
8108                 switch (trans->msg_type) {
8109                 case NFT_MSG_NEWTABLE:
8110                         if (nft_trans_table_update(trans)) {
8111                                 if (!nft_trans_table_enable(trans)) {
8112                                         nf_tables_table_disable(net,
8113                                                                 trans->ctx.table);
8114                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8115                                 }
8116                         } else {
8117                                 nft_clear(net, trans->ctx.table);
8118                         }
8119                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8120                         nft_trans_destroy(trans);
8121                         break;
8122                 case NFT_MSG_DELTABLE:
8123                         list_del_rcu(&trans->ctx.table->list);
8124                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8125                         break;
8126                 case NFT_MSG_NEWCHAIN:
8127                         if (nft_trans_chain_update(trans)) {
8128                                 nft_chain_commit_update(trans);
8129                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8130                                 /* trans destroyed after rcu grace period */
8131                         } else {
8132                                 nft_chain_commit_drop_policy(trans);
8133                                 nft_clear(net, trans->ctx.chain);
8134                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8135                                 nft_trans_destroy(trans);
8136                         }
8137                         break;
8138                 case NFT_MSG_DELCHAIN:
8139                         nft_chain_del(trans->ctx.chain);
8140                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8141                         nf_tables_unregister_hook(trans->ctx.net,
8142                                                   trans->ctx.table,
8143                                                   trans->ctx.chain);
8144                         break;
8145                 case NFT_MSG_NEWRULE:
8146                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8147                         nf_tables_rule_notify(&trans->ctx,
8148                                               nft_trans_rule(trans),
8149                                               NFT_MSG_NEWRULE);
8150                         nft_trans_destroy(trans);
8151                         break;
8152                 case NFT_MSG_DELRULE:
8153                         list_del_rcu(&nft_trans_rule(trans)->list);
8154                         nf_tables_rule_notify(&trans->ctx,
8155                                               nft_trans_rule(trans),
8156                                               NFT_MSG_DELRULE);
8157                         nft_rule_expr_deactivate(&trans->ctx,
8158                                                  nft_trans_rule(trans),
8159                                                  NFT_TRANS_COMMIT);
8160                         break;
8161                 case NFT_MSG_NEWSET:
8162                         nft_clear(net, nft_trans_set(trans));
8163                         /* This avoids hitting -EBUSY when deleting the table
8164                          * from the transaction.
8165                          */
8166                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8167                             !list_empty(&nft_trans_set(trans)->bindings))
8168                                 trans->ctx.table->use--;
8169
8170                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8171                                              NFT_MSG_NEWSET, GFP_KERNEL);
8172                         nft_trans_destroy(trans);
8173                         break;
8174                 case NFT_MSG_DELSET:
8175                         list_del_rcu(&nft_trans_set(trans)->list);
8176                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8177                                              NFT_MSG_DELSET, GFP_KERNEL);
8178                         break;
8179                 case NFT_MSG_NEWSETELEM:
8180                         te = (struct nft_trans_elem *)trans->data;
8181
8182                         te->set->ops->activate(net, te->set, &te->elem);
8183                         nf_tables_setelem_notify(&trans->ctx, te->set,
8184                                                  &te->elem,
8185                                                  NFT_MSG_NEWSETELEM, 0);
8186                         nft_trans_destroy(trans);
8187                         break;
8188                 case NFT_MSG_DELSETELEM:
8189                         te = (struct nft_trans_elem *)trans->data;
8190
8191                         nf_tables_setelem_notify(&trans->ctx, te->set,
8192                                                  &te->elem,
8193                                                  NFT_MSG_DELSETELEM, 0);
8194                         te->set->ops->remove(net, te->set, &te->elem);
8195                         atomic_dec(&te->set->nelems);
8196                         te->set->ndeact--;
8197                         break;
8198                 case NFT_MSG_NEWOBJ:
8199                         if (nft_trans_obj_update(trans)) {
8200                                 nft_obj_commit_update(trans);
8201                                 nf_tables_obj_notify(&trans->ctx,
8202                                                      nft_trans_obj(trans),
8203                                                      NFT_MSG_NEWOBJ);
8204                         } else {
8205                                 nft_clear(net, nft_trans_obj(trans));
8206                                 nf_tables_obj_notify(&trans->ctx,
8207                                                      nft_trans_obj(trans),
8208                                                      NFT_MSG_NEWOBJ);
8209                                 nft_trans_destroy(trans);
8210                         }
8211                         break;
8212                 case NFT_MSG_DELOBJ:
8213                         nft_obj_del(nft_trans_obj(trans));
8214                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8215                                              NFT_MSG_DELOBJ);
8216                         break;
8217                 case NFT_MSG_NEWFLOWTABLE:
8218                         if (nft_trans_flowtable_update(trans)) {
8219                                 nft_trans_flowtable(trans)->data.flags =
8220                                         nft_trans_flowtable_flags(trans);
8221                                 nf_tables_flowtable_notify(&trans->ctx,
8222                                                            nft_trans_flowtable(trans),
8223                                                            &nft_trans_flowtable_hooks(trans),
8224                                                            NFT_MSG_NEWFLOWTABLE);
8225                                 list_splice(&nft_trans_flowtable_hooks(trans),
8226                                             &nft_trans_flowtable(trans)->hook_list);
8227                         } else {
8228                                 nft_clear(net, nft_trans_flowtable(trans));
8229                                 nf_tables_flowtable_notify(&trans->ctx,
8230                                                            nft_trans_flowtable(trans),
8231                                                            &nft_trans_flowtable(trans)->hook_list,
8232                                                            NFT_MSG_NEWFLOWTABLE);
8233                         }
8234                         nft_trans_destroy(trans);
8235                         break;
8236                 case NFT_MSG_DELFLOWTABLE:
8237                         if (nft_trans_flowtable_update(trans)) {
8238                                 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8239                                                         &nft_trans_flowtable_hooks(trans));
8240                                 nf_tables_flowtable_notify(&trans->ctx,
8241                                                            nft_trans_flowtable(trans),
8242                                                            &nft_trans_flowtable_hooks(trans),
8243                                                            NFT_MSG_DELFLOWTABLE);
8244                                 nft_unregister_flowtable_net_hooks(net,
8245                                                                    &nft_trans_flowtable_hooks(trans));
8246                         } else {
8247                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8248                                 nf_tables_flowtable_notify(&trans->ctx,
8249                                                            nft_trans_flowtable(trans),
8250                                                            &nft_trans_flowtable(trans)->hook_list,
8251                                                            NFT_MSG_DELFLOWTABLE);
8252                                 nft_unregister_flowtable_net_hooks(net,
8253                                                 &nft_trans_flowtable(trans)->hook_list);
8254                         }
8255                         break;
8256                 }
8257         }
8258
8259         nft_commit_notify(net, NETLINK_CB(skb).portid);
8260         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8261         nf_tables_commit_release(net);
8262
8263         return 0;
8264 }
8265
8266 static void nf_tables_module_autoload(struct net *net)
8267 {
8268         struct nft_module_request *req, *next;
8269         LIST_HEAD(module_list);
8270
8271         list_splice_init(&net->nft.module_list, &module_list);
8272         mutex_unlock(&net->nft.commit_mutex);
8273         list_for_each_entry_safe(req, next, &module_list, list) {
8274                 request_module("%s", req->module);
8275                 req->done = true;
8276         }
8277         mutex_lock(&net->nft.commit_mutex);
8278         list_splice(&module_list, &net->nft.module_list);
8279 }
8280
8281 static void nf_tables_abort_release(struct nft_trans *trans)
8282 {
8283         switch (trans->msg_type) {
8284         case NFT_MSG_NEWTABLE:
8285                 nf_tables_table_destroy(&trans->ctx);
8286                 break;
8287         case NFT_MSG_NEWCHAIN:
8288                 nf_tables_chain_destroy(&trans->ctx);
8289                 break;
8290         case NFT_MSG_NEWRULE:
8291                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8292                 break;
8293         case NFT_MSG_NEWSET:
8294                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8295                 break;
8296         case NFT_MSG_NEWSETELEM:
8297                 nft_set_elem_destroy(nft_trans_elem_set(trans),
8298                                      nft_trans_elem(trans).priv, true);
8299                 break;
8300         case NFT_MSG_NEWOBJ:
8301                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8302                 break;
8303         case NFT_MSG_NEWFLOWTABLE:
8304                 if (nft_trans_flowtable_update(trans))
8305                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8306                 else
8307                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8308                 break;
8309         }
8310         kfree(trans);
8311 }
8312
8313 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8314 {
8315         struct nft_trans *trans, *next;
8316         struct nft_trans_elem *te;
8317         struct nft_hook *hook;
8318
8319         if (action == NFNL_ABORT_VALIDATE &&
8320             nf_tables_validate(net) < 0)
8321                 return -EAGAIN;
8322
8323         list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
8324                                          list) {
8325                 switch (trans->msg_type) {
8326                 case NFT_MSG_NEWTABLE:
8327                         if (nft_trans_table_update(trans)) {
8328                                 if (nft_trans_table_enable(trans)) {
8329                                         nf_tables_table_disable(net,
8330                                                                 trans->ctx.table);
8331                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8332                                 }
8333                                 nft_trans_destroy(trans);
8334                         } else {
8335                                 list_del_rcu(&trans->ctx.table->list);
8336                         }
8337                         break;
8338                 case NFT_MSG_DELTABLE:
8339                         nft_clear(trans->ctx.net, trans->ctx.table);
8340                         nft_trans_destroy(trans);
8341                         break;
8342                 case NFT_MSG_NEWCHAIN:
8343                         if (nft_trans_chain_update(trans)) {
8344                                 free_percpu(nft_trans_chain_stats(trans));
8345                                 kfree(nft_trans_chain_name(trans));
8346                                 nft_trans_destroy(trans);
8347                         } else {
8348                                 if (nft_chain_is_bound(trans->ctx.chain)) {
8349                                         nft_trans_destroy(trans);
8350                                         break;
8351                                 }
8352                                 trans->ctx.table->use--;
8353                                 nft_chain_del(trans->ctx.chain);
8354                                 nf_tables_unregister_hook(trans->ctx.net,
8355                                                           trans->ctx.table,
8356                                                           trans->ctx.chain);
8357                         }
8358                         break;
8359                 case NFT_MSG_DELCHAIN:
8360                         trans->ctx.table->use++;
8361                         nft_clear(trans->ctx.net, trans->ctx.chain);
8362                         nft_trans_destroy(trans);
8363                         break;
8364                 case NFT_MSG_NEWRULE:
8365                         trans->ctx.chain->use--;
8366                         list_del_rcu(&nft_trans_rule(trans)->list);
8367                         nft_rule_expr_deactivate(&trans->ctx,
8368                                                  nft_trans_rule(trans),
8369                                                  NFT_TRANS_ABORT);
8370                         break;
8371                 case NFT_MSG_DELRULE:
8372                         trans->ctx.chain->use++;
8373                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8374                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8375                         nft_trans_destroy(trans);
8376                         break;
8377                 case NFT_MSG_NEWSET:
8378                         trans->ctx.table->use--;
8379                         if (nft_trans_set_bound(trans)) {
8380                                 nft_trans_destroy(trans);
8381                                 break;
8382                         }
8383                         list_del_rcu(&nft_trans_set(trans)->list);
8384                         break;
8385                 case NFT_MSG_DELSET:
8386                         trans->ctx.table->use++;
8387                         nft_clear(trans->ctx.net, nft_trans_set(trans));
8388                         nft_trans_destroy(trans);
8389                         break;
8390                 case NFT_MSG_NEWSETELEM:
8391                         if (nft_trans_elem_set_bound(trans)) {
8392                                 nft_trans_destroy(trans);
8393                                 break;
8394                         }
8395                         te = (struct nft_trans_elem *)trans->data;
8396                         te->set->ops->remove(net, te->set, &te->elem);
8397                         atomic_dec(&te->set->nelems);
8398                         break;
8399                 case NFT_MSG_DELSETELEM:
8400                         te = (struct nft_trans_elem *)trans->data;
8401
8402                         nft_set_elem_activate(net, te->set, &te->elem);
8403                         te->set->ops->activate(net, te->set, &te->elem);
8404                         te->set->ndeact--;
8405
8406                         nft_trans_destroy(trans);
8407                         break;
8408                 case NFT_MSG_NEWOBJ:
8409                         if (nft_trans_obj_update(trans)) {
8410                                 kfree(nft_trans_obj_newobj(trans));
8411                                 nft_trans_destroy(trans);
8412                         } else {
8413                                 trans->ctx.table->use--;
8414                                 nft_obj_del(nft_trans_obj(trans));
8415                         }
8416                         break;
8417                 case NFT_MSG_DELOBJ:
8418                         trans->ctx.table->use++;
8419                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
8420                         nft_trans_destroy(trans);
8421                         break;
8422                 case NFT_MSG_NEWFLOWTABLE:
8423                         if (nft_trans_flowtable_update(trans)) {
8424                                 nft_unregister_flowtable_net_hooks(net,
8425                                                 &nft_trans_flowtable_hooks(trans));
8426                         } else {
8427                                 trans->ctx.table->use--;
8428                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8429                                 nft_unregister_flowtable_net_hooks(net,
8430                                                 &nft_trans_flowtable(trans)->hook_list);
8431                         }
8432                         break;
8433                 case NFT_MSG_DELFLOWTABLE:
8434                         if (nft_trans_flowtable_update(trans)) {
8435                                 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8436                                         hook->inactive = false;
8437                         } else {
8438                                 trans->ctx.table->use++;
8439                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8440                         }
8441                         nft_trans_destroy(trans);
8442                         break;
8443                 }
8444         }
8445
8446         synchronize_rcu();
8447
8448         list_for_each_entry_safe_reverse(trans, next,
8449                                          &net->nft.commit_list, list) {
8450                 list_del(&trans->list);
8451                 nf_tables_abort_release(trans);
8452         }
8453
8454         if (action == NFNL_ABORT_AUTOLOAD)
8455                 nf_tables_module_autoload(net);
8456         else
8457                 nf_tables_module_autoload_cleanup(net);
8458
8459         return 0;
8460 }
8461
8462 static void nf_tables_cleanup(struct net *net)
8463 {
8464         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8465 }
8466
8467 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8468                            enum nfnl_abort_action action)
8469 {
8470         int ret = __nf_tables_abort(net, action);
8471
8472         mutex_unlock(&net->nft.commit_mutex);
8473
8474         return ret;
8475 }
8476
8477 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8478 {
8479         bool genid_ok;
8480
8481         mutex_lock(&net->nft.commit_mutex);
8482
8483         genid_ok = genid == 0 || net->nft.base_seq == genid;
8484         if (!genid_ok)
8485                 mutex_unlock(&net->nft.commit_mutex);
8486
8487         /* else, commit mutex has to be released by commit or abort function */
8488         return genid_ok;
8489 }
8490
8491 static const struct nfnetlink_subsystem nf_tables_subsys = {
8492         .name           = "nf_tables",
8493         .subsys_id      = NFNL_SUBSYS_NFTABLES,
8494         .cb_count       = NFT_MSG_MAX,
8495         .cb             = nf_tables_cb,
8496         .commit         = nf_tables_commit,
8497         .abort          = nf_tables_abort,
8498         .cleanup        = nf_tables_cleanup,
8499         .valid_genid    = nf_tables_valid_genid,
8500         .owner          = THIS_MODULE,
8501 };
8502
8503 int nft_chain_validate_dependency(const struct nft_chain *chain,
8504                                   enum nft_chain_types type)
8505 {
8506         const struct nft_base_chain *basechain;
8507
8508         if (nft_is_base_chain(chain)) {
8509                 basechain = nft_base_chain(chain);
8510                 if (basechain->type->type != type)
8511                         return -EOPNOTSUPP;
8512         }
8513         return 0;
8514 }
8515 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8516
8517 int nft_chain_validate_hooks(const struct nft_chain *chain,
8518                              unsigned int hook_flags)
8519 {
8520         struct nft_base_chain *basechain;
8521
8522         if (nft_is_base_chain(chain)) {
8523                 basechain = nft_base_chain(chain);
8524
8525                 if ((1 << basechain->ops.hooknum) & hook_flags)
8526                         return 0;
8527
8528                 return -EOPNOTSUPP;
8529         }
8530
8531         return 0;
8532 }
8533 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8534
8535 /*
8536  * Loop detection - walk through the ruleset beginning at the destination chain
8537  * of a new jump until either the source chain is reached (loop) or all
8538  * reachable chains have been traversed.
8539  *
8540  * The loop check is performed whenever a new jump verdict is added to an
8541  * expression or verdict map or a verdict map is bound to a new chain.
8542  */
8543
8544 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8545                                  const struct nft_chain *chain);
8546
8547 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
8548                                         struct nft_set *set,
8549                                         const struct nft_set_iter *iter,
8550                                         struct nft_set_elem *elem)
8551 {
8552         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8553         const struct nft_data *data;
8554
8555         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8556             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
8557                 return 0;
8558
8559         data = nft_set_ext_data(ext);
8560         switch (data->verdict.code) {
8561         case NFT_JUMP:
8562         case NFT_GOTO:
8563                 return nf_tables_check_loops(ctx, data->verdict.chain);
8564         default:
8565                 return 0;
8566         }
8567 }
8568
8569 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8570                                  const struct nft_chain *chain)
8571 {
8572         const struct nft_rule *rule;
8573         const struct nft_expr *expr, *last;
8574         struct nft_set *set;
8575         struct nft_set_binding *binding;
8576         struct nft_set_iter iter;
8577
8578         if (ctx->chain == chain)
8579                 return -ELOOP;
8580
8581         list_for_each_entry(rule, &chain->rules, list) {
8582                 nft_rule_for_each_expr(expr, last, rule) {
8583                         struct nft_immediate_expr *priv;
8584                         const struct nft_data *data;
8585                         int err;
8586
8587                         if (strcmp(expr->ops->type->name, "immediate"))
8588                                 continue;
8589
8590                         priv = nft_expr_priv(expr);
8591                         if (priv->dreg != NFT_REG_VERDICT)
8592                                 continue;
8593
8594                         data = &priv->data;
8595                         switch (data->verdict.code) {
8596                         case NFT_JUMP:
8597                         case NFT_GOTO:
8598                                 err = nf_tables_check_loops(ctx,
8599                                                         data->verdict.chain);
8600                                 if (err < 0)
8601                                         return err;
8602                         default:
8603                                 break;
8604                         }
8605                 }
8606         }
8607
8608         list_for_each_entry(set, &ctx->table->sets, list) {
8609                 if (!nft_is_active_next(ctx->net, set))
8610                         continue;
8611                 if (!(set->flags & NFT_SET_MAP) ||
8612                     set->dtype != NFT_DATA_VERDICT)
8613                         continue;
8614
8615                 list_for_each_entry(binding, &set->bindings, list) {
8616                         if (!(binding->flags & NFT_SET_MAP) ||
8617                             binding->chain != chain)
8618                                 continue;
8619
8620                         iter.genmask    = nft_genmask_next(ctx->net);
8621                         iter.skip       = 0;
8622                         iter.count      = 0;
8623                         iter.err        = 0;
8624                         iter.fn         = nf_tables_loop_check_setelem;
8625
8626                         set->ops->walk(ctx, set, &iter);
8627                         if (iter.err < 0)
8628                                 return iter.err;
8629                 }
8630         }
8631
8632         return 0;
8633 }
8634
8635 /**
8636  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
8637  *
8638  *      @attr: netlink attribute to fetch value from
8639  *      @max: maximum value to be stored in dest
8640  *      @dest: pointer to the variable
8641  *
8642  *      Parse, check and store a given u32 netlink attribute into variable.
8643  *      This function returns -ERANGE if the value goes over maximum value.
8644  *      Otherwise a 0 is returned and the attribute value is stored in the
8645  *      destination variable.
8646  */
8647 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
8648 {
8649         u32 val;
8650
8651         val = ntohl(nla_get_be32(attr));
8652         if (val > max)
8653                 return -ERANGE;
8654
8655         *dest = val;
8656         return 0;
8657 }
8658 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8659
8660 /**
8661  *      nft_parse_register - parse a register value from a netlink attribute
8662  *
8663  *      @attr: netlink attribute
8664  *
8665  *      Parse and translate a register value from a netlink attribute.
8666  *      Registers used to be 128 bit wide, these register numbers will be
8667  *      mapped to the corresponding 32 bit register numbers.
8668  */
8669 static unsigned int nft_parse_register(const struct nlattr *attr)
8670 {
8671         unsigned int reg;
8672
8673         reg = ntohl(nla_get_be32(attr));
8674         switch (reg) {
8675         case NFT_REG_VERDICT...NFT_REG_4:
8676                 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8677         default:
8678                 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8679         }
8680 }
8681
8682 /**
8683  *      nft_dump_register - dump a register value to a netlink attribute
8684  *
8685  *      @skb: socket buffer
8686  *      @attr: attribute number
8687  *      @reg: register number
8688  *
8689  *      Construct a netlink attribute containing the register number. For
8690  *      compatibility reasons, register numbers being a multiple of 4 are
8691  *      translated to the corresponding 128 bit register numbers.
8692  */
8693 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8694 {
8695         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8696                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8697         else
8698                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8699
8700         return nla_put_be32(skb, attr, htonl(reg));
8701 }
8702 EXPORT_SYMBOL_GPL(nft_dump_register);
8703
8704 /**
8705  *      nft_validate_register_load - validate a load from a register
8706  *
8707  *      @reg: the register number
8708  *      @len: the length of the data
8709  *
8710  *      Validate that the input register is one of the general purpose
8711  *      registers and that the length of the load is within the bounds.
8712  */
8713 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
8714 {
8715         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8716                 return -EINVAL;
8717         if (len == 0)
8718                 return -EINVAL;
8719         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
8720                 return -ERANGE;
8721
8722         return 0;
8723 }
8724
8725 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
8726 {
8727         u32 reg;
8728         int err;
8729
8730         reg = nft_parse_register(attr);
8731         err = nft_validate_register_load(reg, len);
8732         if (err < 0)
8733                 return err;
8734
8735         *sreg = reg;
8736         return 0;
8737 }
8738 EXPORT_SYMBOL_GPL(nft_parse_register_load);
8739
8740 /**
8741  *      nft_validate_register_store - validate an expressions' register store
8742  *
8743  *      @ctx: context of the expression performing the load
8744  *      @reg: the destination register number
8745  *      @data: the data to load
8746  *      @type: the data type
8747  *      @len: the length of the data
8748  *
8749  *      Validate that a data load uses the appropriate data type for
8750  *      the destination register and the length is within the bounds.
8751  *      A value of NULL for the data means that its runtime gathered
8752  *      data.
8753  */
8754 static int nft_validate_register_store(const struct nft_ctx *ctx,
8755                                        enum nft_registers reg,
8756                                        const struct nft_data *data,
8757                                        enum nft_data_types type,
8758                                        unsigned int len)
8759 {
8760         int err;
8761
8762         switch (reg) {
8763         case NFT_REG_VERDICT:
8764                 if (type != NFT_DATA_VERDICT)
8765                         return -EINVAL;
8766
8767                 if (data != NULL &&
8768                     (data->verdict.code == NFT_GOTO ||
8769                      data->verdict.code == NFT_JUMP)) {
8770                         err = nf_tables_check_loops(ctx, data->verdict.chain);
8771                         if (err < 0)
8772                                 return err;
8773                 }
8774
8775                 return 0;
8776         default:
8777                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8778                         return -EINVAL;
8779                 if (len == 0)
8780                         return -EINVAL;
8781                 if (reg * NFT_REG32_SIZE + len >
8782                     sizeof_field(struct nft_regs, data))
8783                         return -ERANGE;
8784
8785                 if (data != NULL && type != NFT_DATA_VALUE)
8786                         return -EINVAL;
8787                 return 0;
8788         }
8789 }
8790
8791 int nft_parse_register_store(const struct nft_ctx *ctx,
8792                              const struct nlattr *attr, u8 *dreg,
8793                              const struct nft_data *data,
8794                              enum nft_data_types type, unsigned int len)
8795 {
8796         int err;
8797         u32 reg;
8798
8799         reg = nft_parse_register(attr);
8800         err = nft_validate_register_store(ctx, reg, data, type, len);
8801         if (err < 0)
8802                 return err;
8803
8804         *dreg = reg;
8805         return 0;
8806 }
8807 EXPORT_SYMBOL_GPL(nft_parse_register_store);
8808
8809 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8810         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
8811         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
8812                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
8813         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
8814 };
8815
8816 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8817                             struct nft_data_desc *desc, const struct nlattr *nla)
8818 {
8819         u8 genmask = nft_genmask_next(ctx->net);
8820         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8821         struct nft_chain *chain;
8822         int err;
8823
8824         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8825                                           nft_verdict_policy, NULL);
8826         if (err < 0)
8827                 return err;
8828
8829         if (!tb[NFTA_VERDICT_CODE])
8830                 return -EINVAL;
8831         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
8832
8833         switch (data->verdict.code) {
8834         default:
8835                 switch (data->verdict.code & NF_VERDICT_MASK) {
8836                 case NF_ACCEPT:
8837                 case NF_DROP:
8838                 case NF_QUEUE:
8839                         break;
8840                 default:
8841                         return -EINVAL;
8842                 }
8843                 fallthrough;
8844         case NFT_CONTINUE:
8845         case NFT_BREAK:
8846         case NFT_RETURN:
8847                 break;
8848         case NFT_JUMP:
8849         case NFT_GOTO:
8850                 if (tb[NFTA_VERDICT_CHAIN]) {
8851                         chain = nft_chain_lookup(ctx->net, ctx->table,
8852                                                  tb[NFTA_VERDICT_CHAIN],
8853                                                  genmask);
8854                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8855                         chain = nft_chain_lookup_byid(ctx->net,
8856                                                       tb[NFTA_VERDICT_CHAIN_ID]);
8857                         if (IS_ERR(chain))
8858                                 return PTR_ERR(chain);
8859                 } else {
8860                         return -EINVAL;
8861                 }
8862
8863                 if (IS_ERR(chain))
8864                         return PTR_ERR(chain);
8865                 if (nft_is_base_chain(chain))
8866                         return -EOPNOTSUPP;
8867
8868                 chain->use++;
8869                 data->verdict.chain = chain;
8870                 break;
8871         }
8872
8873         desc->len = sizeof(data->verdict);
8874         desc->type = NFT_DATA_VERDICT;
8875         return 0;
8876 }
8877
8878 static void nft_verdict_uninit(const struct nft_data *data)
8879 {
8880         struct nft_chain *chain;
8881         struct nft_rule *rule;
8882
8883         switch (data->verdict.code) {
8884         case NFT_JUMP:
8885         case NFT_GOTO:
8886                 chain = data->verdict.chain;
8887                 chain->use--;
8888
8889                 if (!nft_chain_is_bound(chain))
8890                         break;
8891
8892                 chain->table->use--;
8893                 list_for_each_entry(rule, &chain->rules, list)
8894                         chain->use--;
8895
8896                 nft_chain_del(chain);
8897                 break;
8898         }
8899 }
8900
8901 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
8902 {
8903         struct nlattr *nest;
8904
8905         nest = nla_nest_start_noflag(skb, type);
8906         if (!nest)
8907                 goto nla_put_failure;
8908
8909         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
8910                 goto nla_put_failure;
8911
8912         switch (v->code) {
8913         case NFT_JUMP:
8914         case NFT_GOTO:
8915                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
8916                                    v->chain->name))
8917                         goto nla_put_failure;
8918         }
8919         nla_nest_end(skb, nest);
8920         return 0;
8921
8922 nla_put_failure:
8923         return -1;
8924 }
8925
8926 static int nft_value_init(const struct nft_ctx *ctx,
8927                           struct nft_data *data, unsigned int size,
8928                           struct nft_data_desc *desc, const struct nlattr *nla)
8929 {
8930         unsigned int len;
8931
8932         len = nla_len(nla);
8933         if (len == 0)
8934                 return -EINVAL;
8935         if (len > size)
8936                 return -EOVERFLOW;
8937
8938         nla_memcpy(data->data, nla, len);
8939         desc->type = NFT_DATA_VALUE;
8940         desc->len  = len;
8941         return 0;
8942 }
8943
8944 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8945                           unsigned int len)
8946 {
8947         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8948 }
8949
8950 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
8951         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
8952         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
8953 };
8954
8955 /**
8956  *      nft_data_init - parse nf_tables data netlink attributes
8957  *
8958  *      @ctx: context of the expression using the data
8959  *      @data: destination struct nft_data
8960  *      @size: maximum data length
8961  *      @desc: data description
8962  *      @nla: netlink attribute containing data
8963  *
8964  *      Parse the netlink data attributes and initialize a struct nft_data.
8965  *      The type and length of data are returned in the data description.
8966  *
8967  *      The caller can indicate that it only wants to accept data of type
8968  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
8969  */
8970 int nft_data_init(const struct nft_ctx *ctx,
8971                   struct nft_data *data, unsigned int size,
8972                   struct nft_data_desc *desc, const struct nlattr *nla)
8973 {
8974         struct nlattr *tb[NFTA_DATA_MAX + 1];
8975         int err;
8976
8977         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8978                                           nft_data_policy, NULL);
8979         if (err < 0)
8980                 return err;
8981
8982         if (tb[NFTA_DATA_VALUE])
8983                 return nft_value_init(ctx, data, size, desc,
8984                                       tb[NFTA_DATA_VALUE]);
8985         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8986                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8987         return -EINVAL;
8988 }
8989 EXPORT_SYMBOL_GPL(nft_data_init);
8990
8991 /**
8992  *      nft_data_release - release a nft_data item
8993  *
8994  *      @data: struct nft_data to release
8995  *      @type: type of data
8996  *
8997  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8998  *      all others need to be released by calling this function.
8999  */
9000 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9001 {
9002         if (type < NFT_DATA_VERDICT)
9003                 return;
9004         switch (type) {
9005         case NFT_DATA_VERDICT:
9006                 return nft_verdict_uninit(data);
9007         default:
9008                 WARN_ON(1);
9009         }
9010 }
9011 EXPORT_SYMBOL_GPL(nft_data_release);
9012
9013 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9014                   enum nft_data_types type, unsigned int len)
9015 {
9016         struct nlattr *nest;
9017         int err;
9018
9019         nest = nla_nest_start_noflag(skb, attr);
9020         if (nest == NULL)
9021                 return -1;
9022
9023         switch (type) {
9024         case NFT_DATA_VALUE:
9025                 err = nft_value_dump(skb, data, len);
9026                 break;
9027         case NFT_DATA_VERDICT:
9028                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9029                 break;
9030         default:
9031                 err = -EINVAL;
9032                 WARN_ON(1);
9033         }
9034
9035         nla_nest_end(skb, nest);
9036         return err;
9037 }
9038 EXPORT_SYMBOL_GPL(nft_data_dump);
9039
9040 int __nft_release_basechain(struct nft_ctx *ctx)
9041 {
9042         struct nft_rule *rule, *nr;
9043
9044         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9045                 return 0;
9046
9047         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9048         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9049                 list_del(&rule->list);
9050                 ctx->chain->use--;
9051                 nf_tables_rule_release(ctx, rule);
9052         }
9053         nft_chain_del(ctx->chain);
9054         ctx->table->use--;
9055         nf_tables_chain_destroy(ctx);
9056
9057         return 0;
9058 }
9059 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9060
9061 static void __nft_release_hook(struct net *net, struct nft_table *table)
9062 {
9063         struct nft_chain *chain;
9064
9065         list_for_each_entry(chain, &table->chains, list)
9066                 nf_tables_unregister_hook(net, table, chain);
9067 }
9068
9069 static void __nft_release_hooks(struct net *net)
9070 {
9071         struct nft_table *table;
9072
9073         list_for_each_entry(table, &net->nft.tables, list) {
9074                 if (nft_table_has_owner(table))
9075                         continue;
9076
9077                 __nft_release_hook(net, table);
9078         }
9079 }
9080
9081 static void __nft_release_table(struct net *net, struct nft_table *table)
9082 {
9083         struct nft_flowtable *flowtable, *nf;
9084         struct nft_chain *chain, *nc;
9085         struct nft_object *obj, *ne;
9086         struct nft_rule *rule, *nr;
9087         struct nft_set *set, *ns;
9088         struct nft_ctx ctx = {
9089                 .net    = net,
9090                 .family = NFPROTO_NETDEV,
9091         };
9092
9093         ctx.family = table->family;
9094         ctx.table = table;
9095         list_for_each_entry(chain, &table->chains, list) {
9096                 ctx.chain = chain;
9097                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9098                         list_del(&rule->list);
9099                         chain->use--;
9100                         nf_tables_rule_release(&ctx, rule);
9101                 }
9102         }
9103         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9104                 list_del(&flowtable->list);
9105                 table->use--;
9106                 nf_tables_flowtable_destroy(flowtable);
9107         }
9108         list_for_each_entry_safe(set, ns, &table->sets, list) {
9109                 list_del(&set->list);
9110                 table->use--;
9111                 nft_set_destroy(&ctx, set);
9112         }
9113         list_for_each_entry_safe(obj, ne, &table->objects, list) {
9114                 nft_obj_del(obj);
9115                 table->use--;
9116                 nft_obj_destroy(&ctx, obj);
9117         }
9118         list_for_each_entry_safe(chain, nc, &table->chains, list) {
9119                 ctx.chain = chain;
9120                 nft_chain_del(chain);
9121                 table->use--;
9122                 nf_tables_chain_destroy(&ctx);
9123         }
9124         list_del(&table->list);
9125         nf_tables_table_destroy(&ctx);
9126 }
9127
9128 static void __nft_release_tables(struct net *net)
9129 {
9130         struct nft_table *table, *nt;
9131
9132         list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
9133                 if (nft_table_has_owner(table))
9134                         continue;
9135
9136                 __nft_release_table(net, table);
9137         }
9138 }
9139
9140 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9141                             void *ptr)
9142 {
9143         struct netlink_notify *n = ptr;
9144         struct nft_table *table, *nt;
9145         struct net *net = n->net;
9146         bool release = false;
9147
9148         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9149                 return NOTIFY_DONE;
9150
9151         mutex_lock(&net->nft.commit_mutex);
9152         list_for_each_entry(table, &net->nft.tables, list) {
9153                 if (nft_table_has_owner(table) &&
9154                     n->portid == table->nlpid) {
9155                         __nft_release_hook(net, table);
9156                         release = true;
9157                 }
9158         }
9159         if (release) {
9160                 synchronize_rcu();
9161                 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
9162                         if (nft_table_has_owner(table) &&
9163                             n->portid == table->nlpid)
9164                                 __nft_release_table(net, table);
9165                 }
9166         }
9167         mutex_unlock(&net->nft.commit_mutex);
9168
9169         return NOTIFY_DONE;
9170 }
9171
9172 static struct notifier_block nft_nl_notifier = {
9173         .notifier_call  = nft_rcv_nl_event,
9174 };
9175
9176 static int __net_init nf_tables_init_net(struct net *net)
9177 {
9178         INIT_LIST_HEAD(&net->nft.tables);
9179         INIT_LIST_HEAD(&net->nft.commit_list);
9180         INIT_LIST_HEAD(&net->nft.module_list);
9181         INIT_LIST_HEAD(&net->nft.notify_list);
9182         mutex_init(&net->nft.commit_mutex);
9183         net->nft.base_seq = 1;
9184         net->nft.validate_state = NFT_VALIDATE_SKIP;
9185
9186         return 0;
9187 }
9188
9189 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9190 {
9191         __nft_release_hooks(net);
9192 }
9193
9194 static void __net_exit nf_tables_exit_net(struct net *net)
9195 {
9196         mutex_lock(&net->nft.commit_mutex);
9197         if (!list_empty(&net->nft.commit_list))
9198                 __nf_tables_abort(net, NFNL_ABORT_NONE);
9199         __nft_release_tables(net);
9200         mutex_unlock(&net->nft.commit_mutex);
9201         WARN_ON_ONCE(!list_empty(&net->nft.tables));
9202         WARN_ON_ONCE(!list_empty(&net->nft.module_list));
9203         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
9204 }
9205
9206 static struct pernet_operations nf_tables_net_ops = {
9207         .init           = nf_tables_init_net,
9208         .pre_exit       = nf_tables_pre_exit_net,
9209         .exit           = nf_tables_exit_net,
9210 };
9211
9212 static int __init nf_tables_module_init(void)
9213 {
9214         int err;
9215
9216         spin_lock_init(&nf_tables_destroy_list_lock);
9217         err = register_pernet_subsys(&nf_tables_net_ops);
9218         if (err < 0)
9219                 return err;
9220
9221         err = nft_chain_filter_init();
9222         if (err < 0)
9223                 goto err_chain_filter;
9224
9225         err = nf_tables_core_module_init();
9226         if (err < 0)
9227                 goto err_core_module;
9228
9229         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9230         if (err < 0)
9231                 goto err_netdev_notifier;
9232
9233         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9234         if (err < 0)
9235                 goto err_rht_objname;
9236
9237         err = nft_offload_init();
9238         if (err < 0)
9239                 goto err_offload;
9240
9241         err = netlink_register_notifier(&nft_nl_notifier);
9242         if (err < 0)
9243                 goto err_netlink_notifier;
9244
9245         /* must be last */
9246         err = nfnetlink_subsys_register(&nf_tables_subsys);
9247         if (err < 0)
9248                 goto err_nfnl_subsys;
9249
9250         nft_chain_route_init();
9251
9252         return err;
9253
9254 err_nfnl_subsys:
9255         netlink_unregister_notifier(&nft_nl_notifier);
9256 err_netlink_notifier:
9257         nft_offload_exit();
9258 err_offload:
9259         rhltable_destroy(&nft_objname_ht);
9260 err_rht_objname:
9261         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9262 err_netdev_notifier:
9263         nf_tables_core_module_exit();
9264 err_core_module:
9265         nft_chain_filter_fini();
9266 err_chain_filter:
9267         unregister_pernet_subsys(&nf_tables_net_ops);
9268         return err;
9269 }
9270
9271 static void __exit nf_tables_module_exit(void)
9272 {
9273         nfnetlink_subsys_unregister(&nf_tables_subsys);
9274         netlink_unregister_notifier(&nft_nl_notifier);
9275         nft_offload_exit();
9276         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9277         nft_chain_filter_fini();
9278         nft_chain_route_fini();
9279         unregister_pernet_subsys(&nf_tables_net_ops);
9280         cancel_work_sync(&trans_destroy_work);
9281         rcu_barrier();
9282         rhltable_destroy(&nft_objname_ht);
9283         nf_tables_core_module_exit();
9284 }
9285
9286 module_init(nf_tables_module_init);
9287 module_exit(nf_tables_module_exit);
9288
9289 MODULE_LICENSE("GPL");
9290 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9291 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);