net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35
  36 enum {
  37         NFT_VALIDATE_SKIP       = 0,
  38         NFT_VALIDATE_NEED,
  39         NFT_VALIDATE_DO,
  40 };
  41
  42 static struct rhltable nft_objname_ht;
  43
  44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  47
  48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  51
  52 static const struct rhashtable_params nft_chain_ht_params = {
  53         .head_offset            = offsetof(struct nft_chain, rhlhead),
  54         .key_offset             = offsetof(struct nft_chain, name),
  55         .hashfn                 = nft_chain_hash,
  56         .obj_hashfn             = nft_chain_hash_obj,
  57         .obj_cmpfn              = nft_chain_hash_cmp,
  58         .automatic_shrinking    = true,
  59 };
  60
  61 static const struct rhashtable_params nft_objname_ht_params = {
  62         .head_offset            = offsetof(struct nft_object, rhlhead),
  63         .key_offset             = offsetof(struct nft_object, key),
  64         .hashfn                 = nft_objname_hash,
  65         .obj_hashfn             = nft_objname_hash_obj,
  66         .obj_cmpfn              = nft_objname_hash_cmp,
  67         .automatic_shrinking    = true,
  68 };
  69
  70 struct nft_audit_data {
  71         struct nft_table *table;
  72         int entries;
  73         int op;
  74         struct list_head list;
  75 };
  76
  77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  78         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  79         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  80         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  81         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  82         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  84         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  85         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  87         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  88         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  90         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  91         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  93         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  94         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  97         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
  99         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 100         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 101         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 102         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 103 };
 104
 105 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
 106 {
 107         struct nftables_pernet *nft_net = nft_pernet(net);
 108
 109         switch (nft_net->validate_state) {
 110         case NFT_VALIDATE_SKIP:
 111                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 112                 break;
 113         case NFT_VALIDATE_NEED:
 114                 break;
 115         case NFT_VALIDATE_DO:
 116                 if (new_validate_state == NFT_VALIDATE_NEED)
 117                         return;
 118         }
 119
 120         nft_net->validate_state = new_validate_state;
 121 }
 122 static void nf_tables_trans_destroy_work(struct work_struct *w);
 123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 124
 125 static void nft_ctx_init(struct nft_ctx *ctx,
 126                          struct net *net,
 127                          const struct sk_buff *skb,
 128                          const struct nlmsghdr *nlh,
 129                          u8 family,
 130                          struct nft_table *table,
 131                          struct nft_chain *chain,
 132                          const struct nlattr * const *nla)
 133 {
 134         ctx->net        = net;
 135         ctx->family     = family;
 136         ctx->level      = 0;
 137         ctx->table      = table;
 138         ctx->chain      = chain;
 139         ctx->nla        = nla;
 140         ctx->portid     = NETLINK_CB(skb).portid;
 141         ctx->report     = nlmsg_report(nlh);
 142         ctx->flags      = nlh->nlmsg_flags;
 143         ctx->seq        = nlh->nlmsg_seq;
 144 }
 145
 146 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 147                                              int msg_type, u32 size, gfp_t gfp)
 148 {
 149         struct nft_trans *trans;
 150
 151         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 152         if (trans == NULL)
 153                 return NULL;
 154
 155         INIT_LIST_HEAD(&trans->list);
 156         trans->msg_type = msg_type;
 157         trans->ctx      = *ctx;
 158
 159         return trans;
 160 }
 161
 162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 163                                          int msg_type, u32 size)
 164 {
 165         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 166 }
 167
 168 static void nft_trans_destroy(struct nft_trans *trans)
 169 {
 170         list_del(&trans->list);
 171         kfree(trans);
 172 }
 173
 174 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 175 {
 176         struct nftables_pernet *nft_net;
 177         struct net *net = ctx->net;
 178         struct nft_trans *trans;
 179
 180         if (!nft_set_is_anonymous(set))
 181                 return;
 182
 183         nft_net = nft_pernet(net);
 184         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 185                 switch (trans->msg_type) {
 186                 case NFT_MSG_NEWSET:
 187                         if (nft_trans_set(trans) == set)
 188                                 nft_trans_set_bound(trans) = true;
 189                         break;
 190                 case NFT_MSG_NEWSETELEM:
 191                         if (nft_trans_elem_set(trans) == set)
 192                                 nft_trans_elem_set_bound(trans) = true;
 193                         break;
 194                 }
 195         }
 196 }
 197
 198 static int nft_netdev_register_hooks(struct net *net,
 199                                      struct list_head *hook_list)
 200 {
 201         struct nft_hook *hook;
 202         int err, j;
 203
 204         j = 0;
 205         list_for_each_entry(hook, hook_list, list) {
 206                 err = nf_register_net_hook(net, &hook->ops);
 207                 if (err < 0)
 208                         goto err_register;
 209
 210                 j++;
 211         }
 212         return 0;
 213
 214 err_register:
 215         list_for_each_entry(hook, hook_list, list) {
 216                 if (j-- <= 0)
 217                         break;
 218
 219                 nf_unregister_net_hook(net, &hook->ops);
 220         }
 221         return err;
 222 }
 223
 224 static void nft_netdev_unregister_hooks(struct net *net,
 225                                         struct list_head *hook_list,
 226                                         bool release_netdev)
 227 {
 228         struct nft_hook *hook, *next;
 229
 230         list_for_each_entry_safe(hook, next, hook_list, list) {
 231                 nf_unregister_net_hook(net, &hook->ops);
 232                 if (release_netdev) {
 233                         list_del(&hook->list);
 234                         kfree_rcu(hook, rcu);
 235                 }
 236         }
 237 }
 238
 239 static int nf_tables_register_hook(struct net *net,
 240                                    const struct nft_table *table,
 241                                    struct nft_chain *chain)
 242 {
 243         struct nft_base_chain *basechain;
 244         const struct nf_hook_ops *ops;
 245
 246         if (table->flags & NFT_TABLE_F_DORMANT ||
 247             !nft_is_base_chain(chain))
 248                 return 0;
 249
 250         basechain = nft_base_chain(chain);
 251         ops = &basechain->ops;
 252
 253         if (basechain->type->ops_register)
 254                 return basechain->type->ops_register(net, ops);
 255
 256         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 257                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 258
 259         return nf_register_net_hook(net, &basechain->ops);
 260 }
 261
 262 static void __nf_tables_unregister_hook(struct net *net,
 263                                         const struct nft_table *table,
 264                                         struct nft_chain *chain,
 265                                         bool release_netdev)
 266 {
 267         struct nft_base_chain *basechain;
 268         const struct nf_hook_ops *ops;
 269
 270         if (table->flags & NFT_TABLE_F_DORMANT ||
 271             !nft_is_base_chain(chain))
 272                 return;
 273         basechain = nft_base_chain(chain);
 274         ops = &basechain->ops;
 275
 276         if (basechain->type->ops_unregister)
 277                 return basechain->type->ops_unregister(net, ops);
 278
 279         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 280                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 281                                             release_netdev);
 282         else
 283                 nf_unregister_net_hook(net, &basechain->ops);
 284 }
 285
 286 static void nf_tables_unregister_hook(struct net *net,
 287                                       const struct nft_table *table,
 288                                       struct nft_chain *chain)
 289 {
 290         return __nf_tables_unregister_hook(net, table, chain, false);
 291 }
 292
 293 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 294 {
 295         struct nftables_pernet *nft_net = nft_pernet(net);
 296
 297         list_add_tail(&trans->list, &nft_net->commit_list);
 298 }
 299
 300 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 301 {
 302         struct nft_trans *trans;
 303
 304         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 305         if (trans == NULL)
 306                 return -ENOMEM;
 307
 308         if (msg_type == NFT_MSG_NEWTABLE)
 309                 nft_activate_next(ctx->net, ctx->table);
 310
 311         nft_trans_commit_list_add_tail(ctx->net, trans);
 312         return 0;
 313 }
 314
 315 static int nft_deltable(struct nft_ctx *ctx)
 316 {
 317         int err;
 318
 319         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 320         if (err < 0)
 321                 return err;
 322
 323         nft_deactivate_next(ctx->net, ctx->table);
 324         return err;
 325 }
 326
 327 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 328 {
 329         struct nft_trans *trans;
 330
 331         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 332         if (trans == NULL)
 333                 return ERR_PTR(-ENOMEM);
 334
 335         if (msg_type == NFT_MSG_NEWCHAIN) {
 336                 nft_activate_next(ctx->net, ctx->chain);
 337
 338                 if (ctx->nla[NFTA_CHAIN_ID]) {
 339                         nft_trans_chain_id(trans) =
 340                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 341                 }
 342         }
 343
 344         nft_trans_commit_list_add_tail(ctx->net, trans);
 345         return trans;
 346 }
 347
 348 static int nft_delchain(struct nft_ctx *ctx)
 349 {
 350         struct nft_trans *trans;
 351
 352         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 353         if (IS_ERR(trans))
 354                 return PTR_ERR(trans);
 355
 356         ctx->table->use--;
 357         nft_deactivate_next(ctx->net, ctx->chain);
 358
 359         return 0;
 360 }
 361
 362 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 363                                    struct nft_rule *rule)
 364 {
 365         struct nft_expr *expr;
 366
 367         expr = nft_expr_first(rule);
 368         while (nft_expr_more(rule, expr)) {
 369                 if (expr->ops->activate)
 370                         expr->ops->activate(ctx, expr);
 371
 372                 expr = nft_expr_next(expr);
 373         }
 374 }
 375
 376 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 377                                      struct nft_rule *rule,
 378                                      enum nft_trans_phase phase)
 379 {
 380         struct nft_expr *expr;
 381
 382         expr = nft_expr_first(rule);
 383         while (nft_expr_more(rule, expr)) {
 384                 if (expr->ops->deactivate)
 385                         expr->ops->deactivate(ctx, expr, phase);
 386
 387                 expr = nft_expr_next(expr);
 388         }
 389 }
 390
 391 static int
 392 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 393 {
 394         /* You cannot delete the same rule twice */
 395         if (nft_is_active_next(ctx->net, rule)) {
 396                 nft_deactivate_next(ctx->net, rule);
 397                 ctx->chain->use--;
 398                 return 0;
 399         }
 400         return -ENOENT;
 401 }
 402
 403 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 404                                             struct nft_rule *rule)
 405 {
 406         struct nft_trans *trans;
 407
 408         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 409         if (trans == NULL)
 410                 return NULL;
 411
 412         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 413                 nft_trans_rule_id(trans) =
 414                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 415         }
 416         nft_trans_rule(trans) = rule;
 417         nft_trans_commit_list_add_tail(ctx->net, trans);
 418
 419         return trans;
 420 }
 421
 422 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 423 {
 424         struct nft_flow_rule *flow;
 425         struct nft_trans *trans;
 426         int err;
 427
 428         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 429         if (trans == NULL)
 430                 return -ENOMEM;
 431
 432         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 433                 flow = nft_flow_rule_create(ctx->net, rule);
 434                 if (IS_ERR(flow)) {
 435                         nft_trans_destroy(trans);
 436                         return PTR_ERR(flow);
 437                 }
 438
 439                 nft_trans_flow_rule(trans) = flow;
 440         }
 441
 442         err = nf_tables_delrule_deactivate(ctx, rule);
 443         if (err < 0) {
 444                 nft_trans_destroy(trans);
 445                 return err;
 446         }
 447         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 448
 449         return 0;
 450 }
 451
 452 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 453 {
 454         struct nft_rule *rule;
 455         int err;
 456
 457         list_for_each_entry(rule, &ctx->chain->rules, list) {
 458                 if (!nft_is_active_next(ctx->net, rule))
 459                         continue;
 460
 461                 err = nft_delrule(ctx, rule);
 462                 if (err < 0)
 463                         return err;
 464         }
 465         return 0;
 466 }
 467
 468 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 469                                struct nft_set *set,
 470                                const struct nft_set_desc *desc)
 471 {
 472         struct nft_trans *trans;
 473
 474         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 475         if (trans == NULL)
 476                 return -ENOMEM;
 477
 478         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 479                 nft_trans_set_id(trans) =
 480                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 481                 nft_activate_next(ctx->net, set);
 482         }
 483         nft_trans_set(trans) = set;
 484         if (desc) {
 485                 nft_trans_set_update(trans) = true;
 486                 nft_trans_set_gc_int(trans) = desc->gc_int;
 487                 nft_trans_set_timeout(trans) = desc->timeout;
 488         }
 489         nft_trans_commit_list_add_tail(ctx->net, trans);
 490
 491         return 0;
 492 }
 493
 494 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 495                              struct nft_set *set)
 496 {
 497         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 498 }
 499
 500 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 501 {
 502         int err;
 503
 504         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 505         if (err < 0)
 506                 return err;
 507
 508         nft_deactivate_next(ctx->net, set);
 509         ctx->table->use--;
 510
 511         return err;
 512 }
 513
 514 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 515                              struct nft_object *obj)
 516 {
 517         struct nft_trans *trans;
 518
 519         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 520         if (trans == NULL)
 521                 return -ENOMEM;
 522
 523         if (msg_type == NFT_MSG_NEWOBJ)
 524                 nft_activate_next(ctx->net, obj);
 525
 526         nft_trans_obj(trans) = obj;
 527         nft_trans_commit_list_add_tail(ctx->net, trans);
 528
 529         return 0;
 530 }
 531
 532 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 533 {
 534         int err;
 535
 536         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 537         if (err < 0)
 538                 return err;
 539
 540         nft_deactivate_next(ctx->net, obj);
 541         ctx->table->use--;
 542
 543         return err;
 544 }
 545
 546 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 547                                    struct nft_flowtable *flowtable)
 548 {
 549         struct nft_trans *trans;
 550
 551         trans = nft_trans_alloc(ctx, msg_type,
 552                                 sizeof(struct nft_trans_flowtable));
 553         if (trans == NULL)
 554                 return -ENOMEM;
 555
 556         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 557                 nft_activate_next(ctx->net, flowtable);
 558
 559         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 560         nft_trans_flowtable(trans) = flowtable;
 561         nft_trans_commit_list_add_tail(ctx->net, trans);
 562
 563         return 0;
 564 }
 565
 566 static int nft_delflowtable(struct nft_ctx *ctx,
 567                             struct nft_flowtable *flowtable)
 568 {
 569         int err;
 570
 571         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 572         if (err < 0)
 573                 return err;
 574
 575         nft_deactivate_next(ctx->net, flowtable);
 576         ctx->table->use--;
 577
 578         return err;
 579 }
 580
 581 /*
 582  * Tables
 583  */
 584
 585 static struct nft_table *nft_table_lookup(const struct net *net,
 586                                           const struct nlattr *nla,
 587                                           u8 family, u8 genmask, u32 nlpid)
 588 {
 589         struct nftables_pernet *nft_net;
 590         struct nft_table *table;
 591
 592         if (nla == NULL)
 593                 return ERR_PTR(-EINVAL);
 594
 595         nft_net = nft_pernet(net);
 596         list_for_each_entry_rcu(table, &nft_net->tables, list,
 597                                 lockdep_is_held(&nft_net->commit_mutex)) {
 598                 if (!nla_strcmp(nla, table->name) &&
 599                     table->family == family &&
 600                     nft_active_genmask(table, genmask)) {
 601                         if (nft_table_has_owner(table) &&
 602                             nlpid && table->nlpid != nlpid)
 603                                 return ERR_PTR(-EPERM);
 604
 605                         return table;
 606                 }
 607         }
 608
 609         return ERR_PTR(-ENOENT);
 610 }
 611
 612 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 613                                                    const struct nlattr *nla,
 614                                                    u8 genmask, u32 nlpid)
 615 {
 616         struct nftables_pernet *nft_net;
 617         struct nft_table *table;
 618
 619         nft_net = nft_pernet(net);
 620         list_for_each_entry(table, &nft_net->tables, list) {
 621                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 622                     nft_active_genmask(table, genmask)) {
 623                         if (nft_table_has_owner(table) &&
 624                             nlpid && table->nlpid != nlpid)
 625                                 return ERR_PTR(-EPERM);
 626
 627                         return table;
 628                 }
 629         }
 630
 631         return ERR_PTR(-ENOENT);
 632 }
 633
 634 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 635 {
 636         return ++table->hgenerator;
 637 }
 638
 639 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 640
 641 static const struct nft_chain_type *
 642 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 643 {
 644         if (family >= NFPROTO_NUMPROTO ||
 645             type >= NFT_CHAIN_T_MAX)
 646                 return NULL;
 647
 648         return chain_type[family][type];
 649 }
 650
 651 static const struct nft_chain_type *
 652 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 653 {
 654         const struct nft_chain_type *type;
 655         int i;
 656
 657         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 658                 type = __nft_chain_type_get(family, i);
 659                 if (!type)
 660                         continue;
 661                 if (!nla_strcmp(nla, type->name))
 662                         return type;
 663         }
 664         return NULL;
 665 }
 666
 667 struct nft_module_request {
 668         struct list_head        list;
 669         char                    module[MODULE_NAME_LEN];
 670         bool                    done;
 671 };
 672
 673 #ifdef CONFIG_MODULES
 674 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 675                                       ...)
 676 {
 677         char module_name[MODULE_NAME_LEN];
 678         struct nftables_pernet *nft_net;
 679         struct nft_module_request *req;
 680         va_list args;
 681         int ret;
 682
 683         va_start(args, fmt);
 684         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 685         va_end(args);
 686         if (ret >= MODULE_NAME_LEN)
 687                 return 0;
 688
 689         nft_net = nft_pernet(net);
 690         list_for_each_entry(req, &nft_net->module_list, list) {
 691                 if (!strcmp(req->module, module_name)) {
 692                         if (req->done)
 693                                 return 0;
 694
 695                         /* A request to load this module already exists. */
 696                         return -EAGAIN;
 697                 }
 698         }
 699
 700         req = kmalloc(sizeof(*req), GFP_KERNEL);
 701         if (!req)
 702                 return -ENOMEM;
 703
 704         req->done = false;
 705         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 706         list_add_tail(&req->list, &nft_net->module_list);
 707
 708         return -EAGAIN;
 709 }
 710 EXPORT_SYMBOL_GPL(nft_request_module);
 711 #endif
 712
 713 static void lockdep_nfnl_nft_mutex_not_held(void)
 714 {
 715 #ifdef CONFIG_PROVE_LOCKING
 716         if (debug_locks)
 717                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 718 #endif
 719 }
 720
 721 static const struct nft_chain_type *
 722 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 723                             u8 family, bool autoload)
 724 {
 725         const struct nft_chain_type *type;
 726
 727         type = __nf_tables_chain_type_lookup(nla, family);
 728         if (type != NULL)
 729                 return type;
 730
 731         lockdep_nfnl_nft_mutex_not_held();
 732 #ifdef CONFIG_MODULES
 733         if (autoload) {
 734                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 735                                        nla_len(nla),
 736                                        (const char *)nla_data(nla)) == -EAGAIN)
 737                         return ERR_PTR(-EAGAIN);
 738         }
 739 #endif
 740         return ERR_PTR(-ENOENT);
 741 }
 742
 743 static __be16 nft_base_seq(const struct net *net)
 744 {
 745         struct nftables_pernet *nft_net = nft_pernet(net);
 746
 747         return htons(nft_net->base_seq & 0xffff);
 748 }
 749
 750 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 751         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 752                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 753         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 754         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 755         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 756                                     .len = NFT_USERDATA_MAXLEN }
 757 };
 758
 759 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 760                                      u32 portid, u32 seq, int event, u32 flags,
 761                                      int family, const struct nft_table *table)
 762 {
 763         struct nlmsghdr *nlh;
 764
 765         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 766         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 767                            NFNETLINK_V0, nft_base_seq(net));
 768         if (!nlh)
 769                 goto nla_put_failure;
 770
 771         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 772             nla_put_be32(skb, NFTA_TABLE_FLAGS,
 773                          htonl(table->flags & NFT_TABLE_F_MASK)) ||
 774             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 775             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 776                          NFTA_TABLE_PAD))
 777                 goto nla_put_failure;
 778         if (nft_table_has_owner(table) &&
 779             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 780                 goto nla_put_failure;
 781
 782         if (table->udata) {
 783                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 784                         goto nla_put_failure;
 785         }
 786
 787         nlmsg_end(skb, nlh);
 788         return 0;
 789
 790 nla_put_failure:
 791         nlmsg_trim(skb, nlh);
 792         return -1;
 793 }
 794
 795 struct nftnl_skb_parms {
 796         bool report;
 797 };
 798 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 799
 800 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 801                                struct list_head *notify_list)
 802 {
 803         NFT_CB(skb).report = report;
 804         list_add_tail(&skb->list, notify_list);
 805 }
 806
 807 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 808 {
 809         struct nftables_pernet *nft_net;
 810         struct sk_buff *skb;
 811         u16 flags = 0;
 812         int err;
 813
 814         if (!ctx->report &&
 815             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 816                 return;
 817
 818         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 819         if (skb == NULL)
 820                 goto err;
 821
 822         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 823                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 824
 825         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 826                                         event, flags, ctx->family, ctx->table);
 827         if (err < 0) {
 828                 kfree_skb(skb);
 829                 goto err;
 830         }
 831
 832         nft_net = nft_pernet(ctx->net);
 833         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 834         return;
 835 err:
 836         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 837 }
 838
 839 static int nf_tables_dump_tables(struct sk_buff *skb,
 840                                  struct netlink_callback *cb)
 841 {
 842         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 843         struct nftables_pernet *nft_net;
 844         const struct nft_table *table;
 845         unsigned int idx = 0, s_idx = cb->args[0];
 846         struct net *net = sock_net(skb->sk);
 847         int family = nfmsg->nfgen_family;
 848
 849         rcu_read_lock();
 850         nft_net = nft_pernet(net);
 851         cb->seq = READ_ONCE(nft_net->base_seq);
 852
 853         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 854                 if (family != NFPROTO_UNSPEC && family != table->family)
 855                         continue;
 856
 857                 if (idx < s_idx)
 858                         goto cont;
 859                 if (idx > s_idx)
 860                         memset(&cb->args[1], 0,
 861                                sizeof(cb->args) - sizeof(cb->args[0]));
 862                 if (!nft_is_active(net, table))
 863                         continue;
 864                 if (nf_tables_fill_table_info(skb, net,
 865                                               NETLINK_CB(cb->skb).portid,
 866                                               cb->nlh->nlmsg_seq,
 867                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 868                                               table->family, table) < 0)
 869                         goto done;
 870
 871                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 872 cont:
 873                 idx++;
 874         }
 875 done:
 876         rcu_read_unlock();
 877         cb->args[0] = idx;
 878         return skb->len;
 879 }
 880
 881 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 882                                       const struct nlmsghdr *nlh,
 883                                       struct netlink_dump_control *c)
 884 {
 885         int err;
 886
 887         if (!try_module_get(THIS_MODULE))
 888                 return -EINVAL;
 889
 890         rcu_read_unlock();
 891         err = netlink_dump_start(nlsk, skb, nlh, c);
 892         rcu_read_lock();
 893         module_put(THIS_MODULE);
 894
 895         return err;
 896 }
 897
 898 /* called with rcu_read_lock held */
 899 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 900                               const struct nlattr * const nla[])
 901 {
 902         struct netlink_ext_ack *extack = info->extack;
 903         u8 genmask = nft_genmask_cur(info->net);
 904         u8 family = info->nfmsg->nfgen_family;
 905         const struct nft_table *table;
 906         struct net *net = info->net;
 907         struct sk_buff *skb2;
 908         int err;
 909
 910         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 911                 struct netlink_dump_control c = {
 912                         .dump = nf_tables_dump_tables,
 913                         .module = THIS_MODULE,
 914                 };
 915
 916                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 917         }
 918
 919         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 920         if (IS_ERR(table)) {
 921                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 922                 return PTR_ERR(table);
 923         }
 924
 925         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 926         if (!skb2)
 927                 return -ENOMEM;
 928
 929         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 930                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 931                                         0, family, table);
 932         if (err < 0)
 933                 goto err_fill_table_info;
 934
 935         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 936
 937 err_fill_table_info:
 938         kfree_skb(skb2);
 939         return err;
 940 }
 941
 942 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 943 {
 944         struct nft_chain *chain;
 945         u32 i = 0;
 946
 947         list_for_each_entry(chain, &table->chains, list) {
 948                 if (!nft_is_active_next(net, chain))
 949                         continue;
 950                 if (!nft_is_base_chain(chain))
 951                         continue;
 952
 953                 if (cnt && i++ == cnt)
 954                         break;
 955
 956                 nf_tables_unregister_hook(net, table, chain);
 957         }
 958 }
 959
 960 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 961 {
 962         struct nft_chain *chain;
 963         int err, i = 0;
 964
 965         list_for_each_entry(chain, &table->chains, list) {
 966                 if (!nft_is_active_next(net, chain))
 967                         continue;
 968                 if (!nft_is_base_chain(chain))
 969                         continue;
 970
 971                 err = nf_tables_register_hook(net, table, chain);
 972                 if (err < 0)
 973                         goto err_register_hooks;
 974
 975                 i++;
 976         }
 977         return 0;
 978
 979 err_register_hooks:
 980         if (i)
 981                 nft_table_disable(net, table, i);
 982         return err;
 983 }
 984
 985 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 986 {
 987         table->flags &= ~NFT_TABLE_F_DORMANT;
 988         nft_table_disable(net, table, 0);
 989         table->flags |= NFT_TABLE_F_DORMANT;
 990 }
 991
 992 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
 993 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
 994 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
 995 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
 996                                          __NFT_TABLE_F_WAS_AWAKEN)
 997
 998 static int nf_tables_updtable(struct nft_ctx *ctx)
 999 {
1000         struct nft_trans *trans;
1001         u32 flags;
1002         int ret;
1003
1004         if (!ctx->nla[NFTA_TABLE_FLAGS])
1005                 return 0;
1006
1007         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1008         if (flags & ~NFT_TABLE_F_MASK)
1009                 return -EOPNOTSUPP;
1010
1011         if (flags == ctx->table->flags)
1012                 return 0;
1013
1014         if ((nft_table_has_owner(ctx->table) &&
1015              !(flags & NFT_TABLE_F_OWNER)) ||
1016             (!nft_table_has_owner(ctx->table) &&
1017              flags & NFT_TABLE_F_OWNER))
1018                 return -EOPNOTSUPP;
1019
1020         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1021                                 sizeof(struct nft_trans_table));
1022         if (trans == NULL)
1023                 return -ENOMEM;
1024
1025         if ((flags & NFT_TABLE_F_DORMANT) &&
1026             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1027                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1028                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1029                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1030         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1031                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1032                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1033                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1034                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1035                         if (ret < 0)
1036                                 goto err_register_hooks;
1037
1038                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1039                 }
1040         }
1041
1042         nft_trans_table_update(trans) = true;
1043         nft_trans_commit_list_add_tail(ctx->net, trans);
1044
1045         return 0;
1046
1047 err_register_hooks:
1048         nft_trans_destroy(trans);
1049         return ret;
1050 }
1051
1052 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1053 {
1054         const char *name = data;
1055
1056         return jhash(name, strlen(name), seed);
1057 }
1058
1059 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1060 {
1061         const struct nft_chain *chain = data;
1062
1063         return nft_chain_hash(chain->name, 0, seed);
1064 }
1065
1066 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1067                               const void *ptr)
1068 {
1069         const struct nft_chain *chain = ptr;
1070         const char *name = arg->key;
1071
1072         return strcmp(chain->name, name);
1073 }
1074
1075 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1076 {
1077         const struct nft_object_hash_key *k = data;
1078
1079         seed ^= hash_ptr(k->table, 32);
1080
1081         return jhash(k->name, strlen(k->name), seed);
1082 }
1083
1084 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1085 {
1086         const struct nft_object *obj = data;
1087
1088         return nft_objname_hash(&obj->key, 0, seed);
1089 }
1090
1091 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1092                                 const void *ptr)
1093 {
1094         const struct nft_object_hash_key *k = arg->key;
1095         const struct nft_object *obj = ptr;
1096
1097         if (obj->key.table != k->table)
1098                 return -1;
1099
1100         return strcmp(obj->key.name, k->name);
1101 }
1102
1103 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1104                               const struct nlattr * const nla[])
1105 {
1106         struct nftables_pernet *nft_net = nft_pernet(info->net);
1107         struct netlink_ext_ack *extack = info->extack;
1108         u8 genmask = nft_genmask_next(info->net);
1109         u8 family = info->nfmsg->nfgen_family;
1110         struct net *net = info->net;
1111         const struct nlattr *attr;
1112         struct nft_table *table;
1113         struct nft_ctx ctx;
1114         u32 flags = 0;
1115         int err;
1116
1117         lockdep_assert_held(&nft_net->commit_mutex);
1118         attr = nla[NFTA_TABLE_NAME];
1119         table = nft_table_lookup(net, attr, family, genmask,
1120                                  NETLINK_CB(skb).portid);
1121         if (IS_ERR(table)) {
1122                 if (PTR_ERR(table) != -ENOENT)
1123                         return PTR_ERR(table);
1124         } else {
1125                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1126                         NL_SET_BAD_ATTR(extack, attr);
1127                         return -EEXIST;
1128                 }
1129                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1130                         return -EOPNOTSUPP;
1131
1132                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1133
1134                 return nf_tables_updtable(&ctx);
1135         }
1136
1137         if (nla[NFTA_TABLE_FLAGS]) {
1138                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1139                 if (flags & ~NFT_TABLE_F_MASK)
1140                         return -EOPNOTSUPP;
1141         }
1142
1143         err = -ENOMEM;
1144         table = kzalloc(sizeof(*table), GFP_KERNEL);
1145         if (table == NULL)
1146                 goto err_kzalloc;
1147
1148         table->name = nla_strdup(attr, GFP_KERNEL);
1149         if (table->name == NULL)
1150                 goto err_strdup;
1151
1152         if (nla[NFTA_TABLE_USERDATA]) {
1153                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1154                 if (table->udata == NULL)
1155                         goto err_table_udata;
1156
1157                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1158         }
1159
1160         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1161         if (err)
1162                 goto err_chain_ht;
1163
1164         INIT_LIST_HEAD(&table->chains);
1165         INIT_LIST_HEAD(&table->sets);
1166         INIT_LIST_HEAD(&table->objects);
1167         INIT_LIST_HEAD(&table->flowtables);
1168         table->family = family;
1169         table->flags = flags;
1170         table->handle = ++nft_net->table_handle;
1171         if (table->flags & NFT_TABLE_F_OWNER)
1172                 table->nlpid = NETLINK_CB(skb).portid;
1173
1174         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1175         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1176         if (err < 0)
1177                 goto err_trans;
1178
1179         list_add_tail_rcu(&table->list, &nft_net->tables);
1180         return 0;
1181 err_trans:
1182         rhltable_destroy(&table->chains_ht);
1183 err_chain_ht:
1184         kfree(table->udata);
1185 err_table_udata:
1186         kfree(table->name);
1187 err_strdup:
1188         kfree(table);
1189 err_kzalloc:
1190         return err;
1191 }
1192
1193 static int nft_flush_table(struct nft_ctx *ctx)
1194 {
1195         struct nft_flowtable *flowtable, *nft;
1196         struct nft_chain *chain, *nc;
1197         struct nft_object *obj, *ne;
1198         struct nft_set *set, *ns;
1199         int err;
1200
1201         list_for_each_entry(chain, &ctx->table->chains, list) {
1202                 if (!nft_is_active_next(ctx->net, chain))
1203                         continue;
1204
1205                 if (nft_chain_is_bound(chain))
1206                         continue;
1207
1208                 ctx->chain = chain;
1209
1210                 err = nft_delrule_by_chain(ctx);
1211                 if (err < 0)
1212                         goto out;
1213         }
1214
1215         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1216                 if (!nft_is_active_next(ctx->net, set))
1217                         continue;
1218
1219                 if (nft_set_is_anonymous(set) &&
1220                     !list_empty(&set->bindings))
1221                         continue;
1222
1223                 err = nft_delset(ctx, set);
1224                 if (err < 0)
1225                         goto out;
1226         }
1227
1228         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1229                 if (!nft_is_active_next(ctx->net, flowtable))
1230                         continue;
1231
1232                 err = nft_delflowtable(ctx, flowtable);
1233                 if (err < 0)
1234                         goto out;
1235         }
1236
1237         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1238                 if (!nft_is_active_next(ctx->net, obj))
1239                         continue;
1240
1241                 err = nft_delobj(ctx, obj);
1242                 if (err < 0)
1243                         goto out;
1244         }
1245
1246         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1247                 if (!nft_is_active_next(ctx->net, chain))
1248                         continue;
1249
1250                 if (nft_chain_is_bound(chain))
1251                         continue;
1252
1253                 ctx->chain = chain;
1254
1255                 err = nft_delchain(ctx);
1256                 if (err < 0)
1257                         goto out;
1258         }
1259
1260         err = nft_deltable(ctx);
1261 out:
1262         return err;
1263 }
1264
1265 static int nft_flush(struct nft_ctx *ctx, int family)
1266 {
1267         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1268         const struct nlattr * const *nla = ctx->nla;
1269         struct nft_table *table, *nt;
1270         int err = 0;
1271
1272         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1273                 if (family != AF_UNSPEC && table->family != family)
1274                         continue;
1275
1276                 ctx->family = table->family;
1277
1278                 if (!nft_is_active_next(ctx->net, table))
1279                         continue;
1280
1281                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1282                         continue;
1283
1284                 if (nla[NFTA_TABLE_NAME] &&
1285                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1286                         continue;
1287
1288                 ctx->table = table;
1289
1290                 err = nft_flush_table(ctx);
1291                 if (err < 0)
1292                         goto out;
1293         }
1294 out:
1295         return err;
1296 }
1297
1298 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1299                               const struct nlattr * const nla[])
1300 {
1301         struct netlink_ext_ack *extack = info->extack;
1302         u8 genmask = nft_genmask_next(info->net);
1303         u8 family = info->nfmsg->nfgen_family;
1304         struct net *net = info->net;
1305         const struct nlattr *attr;
1306         struct nft_table *table;
1307         struct nft_ctx ctx;
1308
1309         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1310         if (family == AF_UNSPEC ||
1311             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1312                 return nft_flush(&ctx, family);
1313
1314         if (nla[NFTA_TABLE_HANDLE]) {
1315                 attr = nla[NFTA_TABLE_HANDLE];
1316                 table = nft_table_lookup_byhandle(net, attr, genmask,
1317                                                   NETLINK_CB(skb).portid);
1318         } else {
1319                 attr = nla[NFTA_TABLE_NAME];
1320                 table = nft_table_lookup(net, attr, family, genmask,
1321                                          NETLINK_CB(skb).portid);
1322         }
1323
1324         if (IS_ERR(table)) {
1325                 NL_SET_BAD_ATTR(extack, attr);
1326                 return PTR_ERR(table);
1327         }
1328
1329         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1330             table->use > 0)
1331                 return -EBUSY;
1332
1333         ctx.family = family;
1334         ctx.table = table;
1335
1336         return nft_flush_table(&ctx);
1337 }
1338
1339 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1340 {
1341         if (WARN_ON(ctx->table->use > 0))
1342                 return;
1343
1344         rhltable_destroy(&ctx->table->chains_ht);
1345         kfree(ctx->table->name);
1346         kfree(ctx->table->udata);
1347         kfree(ctx->table);
1348 }
1349
1350 void nft_register_chain_type(const struct nft_chain_type *ctype)
1351 {
1352         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1353         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1354                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1355                 return;
1356         }
1357         chain_type[ctype->family][ctype->type] = ctype;
1358         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1359 }
1360 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1361
1362 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1363 {
1364         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1365         chain_type[ctype->family][ctype->type] = NULL;
1366         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1367 }
1368 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1369
1370 /*
1371  * Chains
1372  */
1373
1374 static struct nft_chain *
1375 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1376 {
1377         struct nft_chain *chain;
1378
1379         list_for_each_entry(chain, &table->chains, list) {
1380                 if (chain->handle == handle &&
1381                     nft_active_genmask(chain, genmask))
1382                         return chain;
1383         }
1384
1385         return ERR_PTR(-ENOENT);
1386 }
1387
1388 static bool lockdep_commit_lock_is_held(const struct net *net)
1389 {
1390 #ifdef CONFIG_PROVE_LOCKING
1391         struct nftables_pernet *nft_net = nft_pernet(net);
1392
1393         return lockdep_is_held(&nft_net->commit_mutex);
1394 #else
1395         return true;
1396 #endif
1397 }
1398
1399 static struct nft_chain *nft_chain_lookup(struct net *net,
1400                                           struct nft_table *table,
1401                                           const struct nlattr *nla, u8 genmask)
1402 {
1403         char search[NFT_CHAIN_MAXNAMELEN + 1];
1404         struct rhlist_head *tmp, *list;
1405         struct nft_chain *chain;
1406
1407         if (nla == NULL)
1408                 return ERR_PTR(-EINVAL);
1409
1410         nla_strscpy(search, nla, sizeof(search));
1411
1412         WARN_ON(!rcu_read_lock_held() &&
1413                 !lockdep_commit_lock_is_held(net));
1414
1415         chain = ERR_PTR(-ENOENT);
1416         rcu_read_lock();
1417         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1418         if (!list)
1419                 goto out_unlock;
1420
1421         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1422                 if (nft_active_genmask(chain, genmask))
1423                         goto out_unlock;
1424         }
1425         chain = ERR_PTR(-ENOENT);
1426 out_unlock:
1427         rcu_read_unlock();
1428         return chain;
1429 }
1430
1431 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1432         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1433                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1434         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1435         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1436                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1437         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1438         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1439         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1440                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1441         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1442         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1443         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1444         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1445                                     .len = NFT_USERDATA_MAXLEN },
1446 };
1447
1448 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1449         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1450         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1451         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1452                                     .len = IFNAMSIZ - 1 },
1453 };
1454
1455 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1456 {
1457         struct nft_stats *cpu_stats, total;
1458         struct nlattr *nest;
1459         unsigned int seq;
1460         u64 pkts, bytes;
1461         int cpu;
1462
1463         if (!stats)
1464                 return 0;
1465
1466         memset(&total, 0, sizeof(total));
1467         for_each_possible_cpu(cpu) {
1468                 cpu_stats = per_cpu_ptr(stats, cpu);
1469                 do {
1470                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1471                         pkts = cpu_stats->pkts;
1472                         bytes = cpu_stats->bytes;
1473                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1474                 total.pkts += pkts;
1475                 total.bytes += bytes;
1476         }
1477         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1478         if (nest == NULL)
1479                 goto nla_put_failure;
1480
1481         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1482                          NFTA_COUNTER_PAD) ||
1483             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1484                          NFTA_COUNTER_PAD))
1485                 goto nla_put_failure;
1486
1487         nla_nest_end(skb, nest);
1488         return 0;
1489
1490 nla_put_failure:
1491         return -ENOSPC;
1492 }
1493
1494 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1495                                    const struct nft_base_chain *basechain)
1496 {
1497         const struct nf_hook_ops *ops = &basechain->ops;
1498         struct nft_hook *hook, *first = NULL;
1499         struct nlattr *nest, *nest_devs;
1500         int n = 0;
1501
1502         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1503         if (nest == NULL)
1504                 goto nla_put_failure;
1505         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1506                 goto nla_put_failure;
1507         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1508                 goto nla_put_failure;
1509
1510         if (nft_base_chain_netdev(family, ops->hooknum)) {
1511                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1512                 list_for_each_entry(hook, &basechain->hook_list, list) {
1513                         if (!first)
1514                                 first = hook;
1515
1516                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1517                                            hook->ops.dev->name))
1518                                 goto nla_put_failure;
1519                         n++;
1520                 }
1521                 nla_nest_end(skb, nest_devs);
1522
1523                 if (n == 1 &&
1524                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1525                         goto nla_put_failure;
1526         }
1527         nla_nest_end(skb, nest);
1528
1529         return 0;
1530 nla_put_failure:
1531         return -1;
1532 }
1533
1534 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1535                                      u32 portid, u32 seq, int event, u32 flags,
1536                                      int family, const struct nft_table *table,
1537                                      const struct nft_chain *chain)
1538 {
1539         struct nlmsghdr *nlh;
1540
1541         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1542         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1543                            NFNETLINK_V0, nft_base_seq(net));
1544         if (!nlh)
1545                 goto nla_put_failure;
1546
1547         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1548                 goto nla_put_failure;
1549         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1550                          NFTA_CHAIN_PAD))
1551                 goto nla_put_failure;
1552         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1553                 goto nla_put_failure;
1554
1555         if (nft_is_base_chain(chain)) {
1556                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1557                 struct nft_stats __percpu *stats;
1558
1559                 if (nft_dump_basechain_hook(skb, family, basechain))
1560                         goto nla_put_failure;
1561
1562                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1563                                  htonl(basechain->policy)))
1564                         goto nla_put_failure;
1565
1566                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1567                         goto nla_put_failure;
1568
1569                 stats = rcu_dereference_check(basechain->stats,
1570                                               lockdep_commit_lock_is_held(net));
1571                 if (nft_dump_stats(skb, stats))
1572                         goto nla_put_failure;
1573         }
1574
1575         if (chain->flags &&
1576             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1577                 goto nla_put_failure;
1578
1579         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1580                 goto nla_put_failure;
1581
1582         if (chain->udata &&
1583             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1584                 goto nla_put_failure;
1585
1586         nlmsg_end(skb, nlh);
1587         return 0;
1588
1589 nla_put_failure:
1590         nlmsg_trim(skb, nlh);
1591         return -1;
1592 }
1593
1594 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1595 {
1596         struct nftables_pernet *nft_net;
1597         struct sk_buff *skb;
1598         u16 flags = 0;
1599         int err;
1600
1601         if (!ctx->report &&
1602             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1603                 return;
1604
1605         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1606         if (skb == NULL)
1607                 goto err;
1608
1609         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1610                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1611
1612         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1613                                         event, flags, ctx->family, ctx->table,
1614                                         ctx->chain);
1615         if (err < 0) {
1616                 kfree_skb(skb);
1617                 goto err;
1618         }
1619
1620         nft_net = nft_pernet(ctx->net);
1621         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1622         return;
1623 err:
1624         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1625 }
1626
1627 static int nf_tables_dump_chains(struct sk_buff *skb,
1628                                  struct netlink_callback *cb)
1629 {
1630         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1631         unsigned int idx = 0, s_idx = cb->args[0];
1632         struct net *net = sock_net(skb->sk);
1633         int family = nfmsg->nfgen_family;
1634         struct nftables_pernet *nft_net;
1635         const struct nft_table *table;
1636         const struct nft_chain *chain;
1637
1638         rcu_read_lock();
1639         nft_net = nft_pernet(net);
1640         cb->seq = READ_ONCE(nft_net->base_seq);
1641
1642         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1643                 if (family != NFPROTO_UNSPEC && family != table->family)
1644                         continue;
1645
1646                 list_for_each_entry_rcu(chain, &table->chains, list) {
1647                         if (idx < s_idx)
1648                                 goto cont;
1649                         if (idx > s_idx)
1650                                 memset(&cb->args[1], 0,
1651                                        sizeof(cb->args) - sizeof(cb->args[0]));
1652                         if (!nft_is_active(net, chain))
1653                                 continue;
1654                         if (nf_tables_fill_chain_info(skb, net,
1655                                                       NETLINK_CB(cb->skb).portid,
1656                                                       cb->nlh->nlmsg_seq,
1657                                                       NFT_MSG_NEWCHAIN,
1658                                                       NLM_F_MULTI,
1659                                                       table->family, table,
1660                                                       chain) < 0)
1661                                 goto done;
1662
1663                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1664 cont:
1665                         idx++;
1666                 }
1667         }
1668 done:
1669         rcu_read_unlock();
1670         cb->args[0] = idx;
1671         return skb->len;
1672 }
1673
1674 /* called with rcu_read_lock held */
1675 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1676                               const struct nlattr * const nla[])
1677 {
1678         struct netlink_ext_ack *extack = info->extack;
1679         u8 genmask = nft_genmask_cur(info->net);
1680         u8 family = info->nfmsg->nfgen_family;
1681         const struct nft_chain *chain;
1682         struct net *net = info->net;
1683         struct nft_table *table;
1684         struct sk_buff *skb2;
1685         int err;
1686
1687         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1688                 struct netlink_dump_control c = {
1689                         .dump = nf_tables_dump_chains,
1690                         .module = THIS_MODULE,
1691                 };
1692
1693                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1694         }
1695
1696         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1697         if (IS_ERR(table)) {
1698                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1699                 return PTR_ERR(table);
1700         }
1701
1702         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1703         if (IS_ERR(chain)) {
1704                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1705                 return PTR_ERR(chain);
1706         }
1707
1708         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1709         if (!skb2)
1710                 return -ENOMEM;
1711
1712         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1713                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1714                                         0, family, table, chain);
1715         if (err < 0)
1716                 goto err_fill_chain_info;
1717
1718         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1719
1720 err_fill_chain_info:
1721         kfree_skb(skb2);
1722         return err;
1723 }
1724
1725 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1726         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1727         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1728 };
1729
1730 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1731 {
1732         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1733         struct nft_stats __percpu *newstats;
1734         struct nft_stats *stats;
1735         int err;
1736
1737         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1738                                           nft_counter_policy, NULL);
1739         if (err < 0)
1740                 return ERR_PTR(err);
1741
1742         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1743                 return ERR_PTR(-EINVAL);
1744
1745         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1746         if (newstats == NULL)
1747                 return ERR_PTR(-ENOMEM);
1748
1749         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1750          * are not exposed to userspace.
1751          */
1752         preempt_disable();
1753         stats = this_cpu_ptr(newstats);
1754         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1755         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1756         preempt_enable();
1757
1758         return newstats;
1759 }
1760
1761 static void nft_chain_stats_replace(struct nft_trans *trans)
1762 {
1763         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1764
1765         if (!nft_trans_chain_stats(trans))
1766                 return;
1767
1768         nft_trans_chain_stats(trans) =
1769                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1770                                     lockdep_commit_lock_is_held(trans->ctx.net));
1771
1772         if (!nft_trans_chain_stats(trans))
1773                 static_branch_inc(&nft_counters_enabled);
1774 }
1775
1776 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1777 {
1778         struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1779         struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1780
1781         if (g0 != g1)
1782                 kvfree(g1);
1783         kvfree(g0);
1784
1785         /* should be NULL either via abort or via successful commit */
1786         WARN_ON_ONCE(chain->rules_next);
1787         kvfree(chain->rules_next);
1788 }
1789
1790 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1791 {
1792         struct nft_chain *chain = ctx->chain;
1793         struct nft_hook *hook, *next;
1794
1795         if (WARN_ON(chain->use > 0))
1796                 return;
1797
1798         /* no concurrent access possible anymore */
1799         nf_tables_chain_free_chain_rules(chain);
1800
1801         if (nft_is_base_chain(chain)) {
1802                 struct nft_base_chain *basechain = nft_base_chain(chain);
1803
1804                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1805                         list_for_each_entry_safe(hook, next,
1806                                                  &basechain->hook_list, list) {
1807                                 list_del_rcu(&hook->list);
1808                                 kfree_rcu(hook, rcu);
1809                         }
1810                 }
1811                 module_put(basechain->type->owner);
1812                 if (rcu_access_pointer(basechain->stats)) {
1813                         static_branch_dec(&nft_counters_enabled);
1814                         free_percpu(rcu_dereference_raw(basechain->stats));
1815                 }
1816                 kfree(chain->name);
1817                 kfree(chain->udata);
1818                 kfree(basechain);
1819         } else {
1820                 kfree(chain->name);
1821                 kfree(chain->udata);
1822                 kfree(chain);
1823         }
1824 }
1825
1826 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1827                                               const struct nlattr *attr)
1828 {
1829         struct net_device *dev;
1830         char ifname[IFNAMSIZ];
1831         struct nft_hook *hook;
1832         int err;
1833
1834         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1835         if (!hook) {
1836                 err = -ENOMEM;
1837                 goto err_hook_alloc;
1838         }
1839
1840         nla_strscpy(ifname, attr, IFNAMSIZ);
1841         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1842          * indirectly serializing all the other holders of the commit_mutex with
1843          * the rtnl_mutex.
1844          */
1845         dev = __dev_get_by_name(net, ifname);
1846         if (!dev) {
1847                 err = -ENOENT;
1848                 goto err_hook_dev;
1849         }
1850         hook->ops.dev = dev;
1851
1852         return hook;
1853
1854 err_hook_dev:
1855         kfree(hook);
1856 err_hook_alloc:
1857         return ERR_PTR(err);
1858 }
1859
1860 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1861                                            const struct nft_hook *this)
1862 {
1863         struct nft_hook *hook;
1864
1865         list_for_each_entry(hook, hook_list, list) {
1866                 if (this->ops.dev == hook->ops.dev)
1867                         return hook;
1868         }
1869
1870         return NULL;
1871 }
1872
1873 static int nf_tables_parse_netdev_hooks(struct net *net,
1874                                         const struct nlattr *attr,
1875                                         struct list_head *hook_list)
1876 {
1877         struct nft_hook *hook, *next;
1878         const struct nlattr *tmp;
1879         int rem, n = 0, err;
1880
1881         nla_for_each_nested(tmp, attr, rem) {
1882                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1883                         err = -EINVAL;
1884                         goto err_hook;
1885                 }
1886
1887                 hook = nft_netdev_hook_alloc(net, tmp);
1888                 if (IS_ERR(hook)) {
1889                         err = PTR_ERR(hook);
1890                         goto err_hook;
1891                 }
1892                 if (nft_hook_list_find(hook_list, hook)) {
1893                         kfree(hook);
1894                         err = -EEXIST;
1895                         goto err_hook;
1896                 }
1897                 list_add_tail(&hook->list, hook_list);
1898                 n++;
1899
1900                 if (n == NFT_NETDEVICE_MAX) {
1901                         err = -EFBIG;
1902                         goto err_hook;
1903                 }
1904         }
1905
1906         return 0;
1907
1908 err_hook:
1909         list_for_each_entry_safe(hook, next, hook_list, list) {
1910                 list_del(&hook->list);
1911                 kfree(hook);
1912         }
1913         return err;
1914 }
1915
1916 struct nft_chain_hook {
1917         u32                             num;
1918         s32                             priority;
1919         const struct nft_chain_type     *type;
1920         struct list_head                list;
1921 };
1922
1923 static int nft_chain_parse_netdev(struct net *net,
1924                                   struct nlattr *tb[],
1925                                   struct list_head *hook_list)
1926 {
1927         struct nft_hook *hook;
1928         int err;
1929
1930         if (tb[NFTA_HOOK_DEV]) {
1931                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1932                 if (IS_ERR(hook))
1933                         return PTR_ERR(hook);
1934
1935                 list_add_tail(&hook->list, hook_list);
1936         } else if (tb[NFTA_HOOK_DEVS]) {
1937                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1938                                                    hook_list);
1939                 if (err < 0)
1940                         return err;
1941
1942                 if (list_empty(hook_list))
1943                         return -EINVAL;
1944         } else {
1945                 return -EINVAL;
1946         }
1947
1948         return 0;
1949 }
1950
1951 static int nft_chain_parse_hook(struct net *net,
1952                                 const struct nlattr * const nla[],
1953                                 struct nft_chain_hook *hook, u8 family,
1954                                 struct netlink_ext_ack *extack, bool autoload)
1955 {
1956         struct nftables_pernet *nft_net = nft_pernet(net);
1957         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1958         const struct nft_chain_type *type;
1959         int err;
1960
1961         lockdep_assert_held(&nft_net->commit_mutex);
1962         lockdep_nfnl_nft_mutex_not_held();
1963
1964         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1965                                           nla[NFTA_CHAIN_HOOK],
1966                                           nft_hook_policy, NULL);
1967         if (err < 0)
1968                 return err;
1969
1970         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1971             ha[NFTA_HOOK_PRIORITY] == NULL)
1972                 return -EINVAL;
1973
1974         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1975         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1976
1977         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1978         if (!type)
1979                 return -EOPNOTSUPP;
1980
1981         if (nla[NFTA_CHAIN_TYPE]) {
1982                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1983                                                    family, autoload);
1984                 if (IS_ERR(type)) {
1985                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1986                         return PTR_ERR(type);
1987                 }
1988         }
1989         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1990                 return -EOPNOTSUPP;
1991
1992         if (type->type == NFT_CHAIN_T_NAT &&
1993             hook->priority <= NF_IP_PRI_CONNTRACK)
1994                 return -EOPNOTSUPP;
1995
1996         if (!try_module_get(type->owner)) {
1997                 if (nla[NFTA_CHAIN_TYPE])
1998                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1999                 return -ENOENT;
2000         }
2001
2002         hook->type = type;
2003
2004         INIT_LIST_HEAD(&hook->list);
2005         if (nft_base_chain_netdev(family, hook->num)) {
2006                 err = nft_chain_parse_netdev(net, ha, &hook->list);
2007                 if (err < 0) {
2008                         module_put(type->owner);
2009                         return err;
2010                 }
2011         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2012                 module_put(type->owner);
2013                 return -EOPNOTSUPP;
2014         }
2015
2016         return 0;
2017 }
2018
2019 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2020 {
2021         struct nft_hook *h, *next;
2022
2023         list_for_each_entry_safe(h, next, &hook->list, list) {
2024                 list_del(&h->list);
2025                 kfree(h);
2026         }
2027         module_put(hook->type->owner);
2028 }
2029
2030 struct nft_rules_old {
2031         struct rcu_head h;
2032         struct nft_rule **start;
2033 };
2034
2035 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2036                                                      unsigned int alloc)
2037 {
2038         if (alloc > INT_MAX)
2039                 return NULL;
2040
2041         alloc += 1;     /* NULL, ends rules */
2042         if (sizeof(struct nft_rule *) > INT_MAX / alloc)
2043                 return NULL;
2044
2045         alloc *= sizeof(struct nft_rule *);
2046         alloc += sizeof(struct nft_rules_old);
2047
2048         return kvmalloc(alloc, GFP_KERNEL);
2049 }
2050
2051 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2052                                     const struct nft_chain_hook *hook,
2053                                     struct nft_chain *chain)
2054 {
2055         ops->pf                 = family;
2056         ops->hooknum            = hook->num;
2057         ops->priority           = hook->priority;
2058         ops->priv               = chain;
2059         ops->hook               = hook->type->hooks[ops->hooknum];
2060         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2061 }
2062
2063 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2064                               struct nft_chain_hook *hook, u32 flags)
2065 {
2066         struct nft_chain *chain;
2067         struct nft_hook *h;
2068
2069         basechain->type = hook->type;
2070         INIT_LIST_HEAD(&basechain->hook_list);
2071         chain = &basechain->chain;
2072
2073         if (nft_base_chain_netdev(family, hook->num)) {
2074                 list_splice_init(&hook->list, &basechain->hook_list);
2075                 list_for_each_entry(h, &basechain->hook_list, list)
2076                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2077
2078                 basechain->ops.hooknum  = hook->num;
2079                 basechain->ops.priority = hook->priority;
2080         } else {
2081                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2082         }
2083
2084         chain->flags |= NFT_CHAIN_BASE | flags;
2085         basechain->policy = NF_ACCEPT;
2086         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2087             !nft_chain_offload_support(basechain)) {
2088                 list_splice_init(&basechain->hook_list, &hook->list);
2089                 return -EOPNOTSUPP;
2090         }
2091
2092         flow_block_init(&basechain->flow_block);
2093
2094         return 0;
2095 }
2096
2097 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2098 {
2099         int err;
2100
2101         err = rhltable_insert_key(&table->chains_ht, chain->name,
2102                                   &chain->rhlhead, nft_chain_ht_params);
2103         if (err)
2104                 return err;
2105
2106         list_add_tail_rcu(&chain->list, &table->chains);
2107
2108         return 0;
2109 }
2110
2111 static u64 chain_id;
2112
2113 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2114                               u8 policy, u32 flags,
2115                               struct netlink_ext_ack *extack)
2116 {
2117         const struct nlattr * const *nla = ctx->nla;
2118         struct nft_table *table = ctx->table;
2119         struct nft_base_chain *basechain;
2120         struct net *net = ctx->net;
2121         char name[NFT_NAME_MAXLEN];
2122         struct nft_trans *trans;
2123         struct nft_chain *chain;
2124         struct nft_rule **rules;
2125         int err;
2126
2127         if (table->use == UINT_MAX)
2128                 return -EOVERFLOW;
2129
2130         if (nla[NFTA_CHAIN_HOOK]) {
2131                 struct nft_stats __percpu *stats = NULL;
2132                 struct nft_chain_hook hook;
2133
2134                 if (flags & NFT_CHAIN_BINDING)
2135                         return -EOPNOTSUPP;
2136
2137                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2138                                            true);
2139                 if (err < 0)
2140                         return err;
2141
2142                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2143                 if (basechain == NULL) {
2144                         nft_chain_release_hook(&hook);
2145                         return -ENOMEM;
2146                 }
2147                 chain = &basechain->chain;
2148
2149                 if (nla[NFTA_CHAIN_COUNTERS]) {
2150                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2151                         if (IS_ERR(stats)) {
2152                                 nft_chain_release_hook(&hook);
2153                                 kfree(basechain);
2154                                 return PTR_ERR(stats);
2155                         }
2156                         rcu_assign_pointer(basechain->stats, stats);
2157                 }
2158
2159                 err = nft_basechain_init(basechain, family, &hook, flags);
2160                 if (err < 0) {
2161                         nft_chain_release_hook(&hook);
2162                         kfree(basechain);
2163                         free_percpu(stats);
2164                         return err;
2165                 }
2166                 if (stats)
2167                         static_branch_inc(&nft_counters_enabled);
2168         } else {
2169                 if (flags & NFT_CHAIN_BASE)
2170                         return -EINVAL;
2171                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2172                         return -EOPNOTSUPP;
2173
2174                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2175                 if (chain == NULL)
2176                         return -ENOMEM;
2177
2178                 chain->flags = flags;
2179         }
2180         ctx->chain = chain;
2181
2182         INIT_LIST_HEAD(&chain->rules);
2183         chain->handle = nf_tables_alloc_handle(table);
2184         chain->table = table;
2185
2186         if (nla[NFTA_CHAIN_NAME]) {
2187                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2188         } else {
2189                 if (!(flags & NFT_CHAIN_BINDING)) {
2190                         err = -EINVAL;
2191                         goto err_destroy_chain;
2192                 }
2193
2194                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2195                 chain->name = kstrdup(name, GFP_KERNEL);
2196         }
2197
2198         if (!chain->name) {
2199                 err = -ENOMEM;
2200                 goto err_destroy_chain;
2201         }
2202
2203         if (nla[NFTA_CHAIN_USERDATA]) {
2204                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2205                 if (chain->udata == NULL) {
2206                         err = -ENOMEM;
2207                         goto err_destroy_chain;
2208                 }
2209                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2210         }
2211
2212         rules = nf_tables_chain_alloc_rules(chain, 0);
2213         if (!rules) {
2214                 err = -ENOMEM;
2215                 goto err_destroy_chain;
2216         }
2217
2218         *rules = NULL;
2219         rcu_assign_pointer(chain->rules_gen_0, rules);
2220         rcu_assign_pointer(chain->rules_gen_1, rules);
2221
2222         err = nf_tables_register_hook(net, table, chain);
2223         if (err < 0)
2224                 goto err_destroy_chain;
2225
2226         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2227         if (IS_ERR(trans)) {
2228                 err = PTR_ERR(trans);
2229                 goto err_unregister_hook;
2230         }
2231
2232         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2233         if (nft_is_base_chain(chain))
2234                 nft_trans_chain_policy(trans) = policy;
2235
2236         err = nft_chain_add(table, chain);
2237         if (err < 0) {
2238                 nft_trans_destroy(trans);
2239                 goto err_unregister_hook;
2240         }
2241
2242         table->use++;
2243
2244         return 0;
2245 err_unregister_hook:
2246         nf_tables_unregister_hook(net, table, chain);
2247 err_destroy_chain:
2248         nf_tables_chain_destroy(ctx);
2249
2250         return err;
2251 }
2252
2253 static bool nft_hook_list_equal(struct list_head *hook_list1,
2254                                 struct list_head *hook_list2)
2255 {
2256         struct nft_hook *hook;
2257         int n = 0, m = 0;
2258
2259         n = 0;
2260         list_for_each_entry(hook, hook_list2, list) {
2261                 if (!nft_hook_list_find(hook_list1, hook))
2262                         return false;
2263
2264                 n++;
2265         }
2266         list_for_each_entry(hook, hook_list1, list)
2267                 m++;
2268
2269         return n == m;
2270 }
2271
2272 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2273                               u32 flags, const struct nlattr *attr,
2274                               struct netlink_ext_ack *extack)
2275 {
2276         const struct nlattr * const *nla = ctx->nla;
2277         struct nft_table *table = ctx->table;
2278         struct nft_chain *chain = ctx->chain;
2279         struct nft_base_chain *basechain;
2280         struct nft_stats *stats = NULL;
2281         struct nft_chain_hook hook;
2282         struct nf_hook_ops *ops;
2283         struct nft_trans *trans;
2284         int err;
2285
2286         if (chain->flags ^ flags)
2287                 return -EOPNOTSUPP;
2288
2289         if (nla[NFTA_CHAIN_HOOK]) {
2290                 if (!nft_is_base_chain(chain)) {
2291                         NL_SET_BAD_ATTR(extack, attr);
2292                         return -EEXIST;
2293                 }
2294                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2295                                            extack, false);
2296                 if (err < 0)
2297                         return err;
2298
2299                 basechain = nft_base_chain(chain);
2300                 if (basechain->type != hook.type) {
2301                         nft_chain_release_hook(&hook);
2302                         NL_SET_BAD_ATTR(extack, attr);
2303                         return -EEXIST;
2304                 }
2305
2306                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2307                         if (!nft_hook_list_equal(&basechain->hook_list,
2308                                                  &hook.list)) {
2309                                 nft_chain_release_hook(&hook);
2310                                 NL_SET_BAD_ATTR(extack, attr);
2311                                 return -EEXIST;
2312                         }
2313                 } else {
2314                         ops = &basechain->ops;
2315                         if (ops->hooknum != hook.num ||
2316                             ops->priority != hook.priority) {
2317                                 nft_chain_release_hook(&hook);
2318                                 NL_SET_BAD_ATTR(extack, attr);
2319                                 return -EEXIST;
2320                         }
2321                 }
2322                 nft_chain_release_hook(&hook);
2323         }
2324
2325         if (nla[NFTA_CHAIN_HANDLE] &&
2326             nla[NFTA_CHAIN_NAME]) {
2327                 struct nft_chain *chain2;
2328
2329                 chain2 = nft_chain_lookup(ctx->net, table,
2330                                           nla[NFTA_CHAIN_NAME], genmask);
2331                 if (!IS_ERR(chain2)) {
2332                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2333                         return -EEXIST;
2334                 }
2335         }
2336
2337         if (nla[NFTA_CHAIN_COUNTERS]) {
2338                 if (!nft_is_base_chain(chain))
2339                         return -EOPNOTSUPP;
2340
2341                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2342                 if (IS_ERR(stats))
2343                         return PTR_ERR(stats);
2344         }
2345
2346         err = -ENOMEM;
2347         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2348                                 sizeof(struct nft_trans_chain));
2349         if (trans == NULL)
2350                 goto err;
2351
2352         nft_trans_chain_stats(trans) = stats;
2353         nft_trans_chain_update(trans) = true;
2354
2355         if (nla[NFTA_CHAIN_POLICY])
2356                 nft_trans_chain_policy(trans) = policy;
2357         else
2358                 nft_trans_chain_policy(trans) = -1;
2359
2360         if (nla[NFTA_CHAIN_HANDLE] &&
2361             nla[NFTA_CHAIN_NAME]) {
2362                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2363                 struct nft_trans *tmp;
2364                 char *name;
2365
2366                 err = -ENOMEM;
2367                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2368                 if (!name)
2369                         goto err;
2370
2371                 err = -EEXIST;
2372                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2373                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2374                             tmp->ctx.table == table &&
2375                             nft_trans_chain_update(tmp) &&
2376                             nft_trans_chain_name(tmp) &&
2377                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2378                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2379                                 kfree(name);
2380                                 goto err;
2381                         }
2382                 }
2383
2384                 nft_trans_chain_name(trans) = name;
2385         }
2386         nft_trans_commit_list_add_tail(ctx->net, trans);
2387
2388         return 0;
2389 err:
2390         free_percpu(stats);
2391         kfree(trans);
2392         return err;
2393 }
2394
2395 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2396                                                const struct nft_table *table,
2397                                                const struct nlattr *nla)
2398 {
2399         struct nftables_pernet *nft_net = nft_pernet(net);
2400         u32 id = ntohl(nla_get_be32(nla));
2401         struct nft_trans *trans;
2402
2403         list_for_each_entry(trans, &nft_net->commit_list, list) {
2404                 struct nft_chain *chain = trans->ctx.chain;
2405
2406                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2407                     chain->table == table &&
2408                     id == nft_trans_chain_id(trans))
2409                         return chain;
2410         }
2411         return ERR_PTR(-ENOENT);
2412 }
2413
2414 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2415                               const struct nlattr * const nla[])
2416 {
2417         struct nftables_pernet *nft_net = nft_pernet(info->net);
2418         struct netlink_ext_ack *extack = info->extack;
2419         u8 genmask = nft_genmask_next(info->net);
2420         u8 family = info->nfmsg->nfgen_family;
2421         struct nft_chain *chain = NULL;
2422         struct net *net = info->net;
2423         const struct nlattr *attr;
2424         struct nft_table *table;
2425         u8 policy = NF_ACCEPT;
2426         struct nft_ctx ctx;
2427         u64 handle = 0;
2428         u32 flags = 0;
2429
2430         lockdep_assert_held(&nft_net->commit_mutex);
2431
2432         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2433                                  NETLINK_CB(skb).portid);
2434         if (IS_ERR(table)) {
2435                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2436                 return PTR_ERR(table);
2437         }
2438
2439         chain = NULL;
2440         attr = nla[NFTA_CHAIN_NAME];
2441
2442         if (nla[NFTA_CHAIN_HANDLE]) {
2443                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2444                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2445                 if (IS_ERR(chain)) {
2446                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2447                         return PTR_ERR(chain);
2448                 }
2449                 attr = nla[NFTA_CHAIN_HANDLE];
2450         } else if (nla[NFTA_CHAIN_NAME]) {
2451                 chain = nft_chain_lookup(net, table, attr, genmask);
2452                 if (IS_ERR(chain)) {
2453                         if (PTR_ERR(chain) != -ENOENT) {
2454                                 NL_SET_BAD_ATTR(extack, attr);
2455                                 return PTR_ERR(chain);
2456                         }
2457                         chain = NULL;
2458                 }
2459         } else if (!nla[NFTA_CHAIN_ID]) {
2460                 return -EINVAL;
2461         }
2462
2463         if (nla[NFTA_CHAIN_POLICY]) {
2464                 if (chain != NULL &&
2465                     !nft_is_base_chain(chain)) {
2466                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2467                         return -EOPNOTSUPP;
2468                 }
2469
2470                 if (chain == NULL &&
2471                     nla[NFTA_CHAIN_HOOK] == NULL) {
2472                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2473                         return -EOPNOTSUPP;
2474                 }
2475
2476                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2477                 switch (policy) {
2478                 case NF_DROP:
2479                 case NF_ACCEPT:
2480                         break;
2481                 default:
2482                         return -EINVAL;
2483                 }
2484         }
2485
2486         if (nla[NFTA_CHAIN_FLAGS])
2487                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2488         else if (chain)
2489                 flags = chain->flags;
2490
2491         if (flags & ~NFT_CHAIN_FLAGS)
2492                 return -EOPNOTSUPP;
2493
2494         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2495
2496         if (chain != NULL) {
2497                 if (chain->flags & NFT_CHAIN_BINDING)
2498                         return -EINVAL;
2499
2500                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2501                         NL_SET_BAD_ATTR(extack, attr);
2502                         return -EEXIST;
2503                 }
2504                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2505                         return -EOPNOTSUPP;
2506
2507                 flags |= chain->flags & NFT_CHAIN_BASE;
2508                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2509                                           extack);
2510         }
2511
2512         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2513 }
2514
2515 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2516                               const struct nlattr * const nla[])
2517 {
2518         struct netlink_ext_ack *extack = info->extack;
2519         u8 genmask = nft_genmask_next(info->net);
2520         u8 family = info->nfmsg->nfgen_family;
2521         struct net *net = info->net;
2522         const struct nlattr *attr;
2523         struct nft_table *table;
2524         struct nft_chain *chain;
2525         struct nft_rule *rule;
2526         struct nft_ctx ctx;
2527         u64 handle;
2528         u32 use;
2529         int err;
2530
2531         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2532                                  NETLINK_CB(skb).portid);
2533         if (IS_ERR(table)) {
2534                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2535                 return PTR_ERR(table);
2536         }
2537
2538         if (nla[NFTA_CHAIN_HANDLE]) {
2539                 attr = nla[NFTA_CHAIN_HANDLE];
2540                 handle = be64_to_cpu(nla_get_be64(attr));
2541                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2542         } else {
2543                 attr = nla[NFTA_CHAIN_NAME];
2544                 chain = nft_chain_lookup(net, table, attr, genmask);
2545         }
2546         if (IS_ERR(chain)) {
2547                 NL_SET_BAD_ATTR(extack, attr);
2548                 return PTR_ERR(chain);
2549         }
2550
2551         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2552             chain->use > 0)
2553                 return -EBUSY;
2554
2555         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2556
2557         use = chain->use;
2558         list_for_each_entry(rule, &chain->rules, list) {
2559                 if (!nft_is_active_next(net, rule))
2560                         continue;
2561                 use--;
2562
2563                 err = nft_delrule(&ctx, rule);
2564                 if (err < 0)
2565                         return err;
2566         }
2567
2568         /* There are rules and elements that are still holding references to us,
2569          * we cannot do a recursive removal in this case.
2570          */
2571         if (use > 0) {
2572                 NL_SET_BAD_ATTR(extack, attr);
2573                 return -EBUSY;
2574         }
2575
2576         return nft_delchain(&ctx);
2577 }
2578
2579 /*
2580  * Expressions
2581  */
2582
2583 /**
2584  *      nft_register_expr - register nf_tables expr type
2585  *      @type: expr type
2586  *
2587  *      Registers the expr type for use with nf_tables. Returns zero on
2588  *      success or a negative errno code otherwise.
2589  */
2590 int nft_register_expr(struct nft_expr_type *type)
2591 {
2592         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2593         if (type->family == NFPROTO_UNSPEC)
2594                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2595         else
2596                 list_add_rcu(&type->list, &nf_tables_expressions);
2597         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2598         return 0;
2599 }
2600 EXPORT_SYMBOL_GPL(nft_register_expr);
2601
2602 /**
2603  *      nft_unregister_expr - unregister nf_tables expr type
2604  *      @type: expr type
2605  *
2606  *      Unregisters the expr typefor use with nf_tables.
2607  */
2608 void nft_unregister_expr(struct nft_expr_type *type)
2609 {
2610         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2611         list_del_rcu(&type->list);
2612         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2613 }
2614 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2615
2616 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2617                                                        struct nlattr *nla)
2618 {
2619         const struct nft_expr_type *type, *candidate = NULL;
2620
2621         list_for_each_entry(type, &nf_tables_expressions, list) {
2622                 if (!nla_strcmp(nla, type->name)) {
2623                         if (!type->family && !candidate)
2624                                 candidate = type;
2625                         else if (type->family == family)
2626                                 candidate = type;
2627                 }
2628         }
2629         return candidate;
2630 }
2631
2632 #ifdef CONFIG_MODULES
2633 static int nft_expr_type_request_module(struct net *net, u8 family,
2634                                         struct nlattr *nla)
2635 {
2636         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2637                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2638                 return -EAGAIN;
2639
2640         return 0;
2641 }
2642 #endif
2643
2644 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2645                                                      u8 family,
2646                                                      struct nlattr *nla)
2647 {
2648         const struct nft_expr_type *type;
2649
2650         if (nla == NULL)
2651                 return ERR_PTR(-EINVAL);
2652
2653         type = __nft_expr_type_get(family, nla);
2654         if (type != NULL && try_module_get(type->owner))
2655                 return type;
2656
2657         lockdep_nfnl_nft_mutex_not_held();
2658 #ifdef CONFIG_MODULES
2659         if (type == NULL) {
2660                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2661                         return ERR_PTR(-EAGAIN);
2662
2663                 if (nft_request_module(net, "nft-expr-%.*s",
2664                                        nla_len(nla),
2665                                        (char *)nla_data(nla)) == -EAGAIN)
2666                         return ERR_PTR(-EAGAIN);
2667         }
2668 #endif
2669         return ERR_PTR(-ENOENT);
2670 }
2671
2672 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2673         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2674                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2675         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2676 };
2677
2678 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2679                                     const struct nft_expr *expr)
2680 {
2681         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2682                 goto nla_put_failure;
2683
2684         if (expr->ops->dump) {
2685                 struct nlattr *data = nla_nest_start_noflag(skb,
2686                                                             NFTA_EXPR_DATA);
2687                 if (data == NULL)
2688                         goto nla_put_failure;
2689                 if (expr->ops->dump(skb, expr) < 0)
2690                         goto nla_put_failure;
2691                 nla_nest_end(skb, data);
2692         }
2693
2694         return skb->len;
2695
2696 nla_put_failure:
2697         return -1;
2698 };
2699
2700 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2701                   const struct nft_expr *expr)
2702 {
2703         struct nlattr *nest;
2704
2705         nest = nla_nest_start_noflag(skb, attr);
2706         if (!nest)
2707                 goto nla_put_failure;
2708         if (nf_tables_fill_expr_info(skb, expr) < 0)
2709                 goto nla_put_failure;
2710         nla_nest_end(skb, nest);
2711         return 0;
2712
2713 nla_put_failure:
2714         return -1;
2715 }
2716
2717 struct nft_expr_info {
2718         const struct nft_expr_ops       *ops;
2719         const struct nlattr             *attr;
2720         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2721 };
2722
2723 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2724                                 const struct nlattr *nla,
2725                                 struct nft_expr_info *info)
2726 {
2727         const struct nft_expr_type *type;
2728         const struct nft_expr_ops *ops;
2729         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2730         int err;
2731
2732         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2733                                           nft_expr_policy, NULL);
2734         if (err < 0)
2735                 return err;
2736
2737         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2738         if (IS_ERR(type))
2739                 return PTR_ERR(type);
2740
2741         if (tb[NFTA_EXPR_DATA]) {
2742                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2743                                                   tb[NFTA_EXPR_DATA],
2744                                                   type->policy, NULL);
2745                 if (err < 0)
2746                         goto err1;
2747         } else
2748                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2749
2750         if (type->select_ops != NULL) {
2751                 ops = type->select_ops(ctx,
2752                                        (const struct nlattr * const *)info->tb);
2753                 if (IS_ERR(ops)) {
2754                         err = PTR_ERR(ops);
2755 #ifdef CONFIG_MODULES
2756                         if (err == -EAGAIN)
2757                                 if (nft_expr_type_request_module(ctx->net,
2758                                                                  ctx->family,
2759                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2760                                         err = -ENOENT;
2761 #endif
2762                         goto err1;
2763                 }
2764         } else
2765                 ops = type->ops;
2766
2767         info->attr = nla;
2768         info->ops = ops;
2769
2770         return 0;
2771
2772 err1:
2773         module_put(type->owner);
2774         return err;
2775 }
2776
2777 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2778                              const struct nft_expr_info *expr_info,
2779                              struct nft_expr *expr)
2780 {
2781         const struct nft_expr_ops *ops = expr_info->ops;
2782         int err;
2783
2784         expr->ops = ops;
2785         if (ops->init) {
2786                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2787                 if (err < 0)
2788                         goto err1;
2789         }
2790
2791         return 0;
2792 err1:
2793         expr->ops = NULL;
2794         return err;
2795 }
2796
2797 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2798                                    struct nft_expr *expr)
2799 {
2800         const struct nft_expr_type *type = expr->ops->type;
2801
2802         if (expr->ops->destroy)
2803                 expr->ops->destroy(ctx, expr);
2804         module_put(type->owner);
2805 }
2806
2807 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2808                                       const struct nlattr *nla)
2809 {
2810         struct nft_expr_info expr_info;
2811         struct nft_expr *expr;
2812         struct module *owner;
2813         int err;
2814
2815         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2816         if (err < 0)
2817                 goto err_expr_parse;
2818
2819         err = -EOPNOTSUPP;
2820         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2821                 goto err_expr_stateful;
2822
2823         err = -ENOMEM;
2824         expr = kzalloc(expr_info.ops->size, GFP_KERNEL);
2825         if (expr == NULL)
2826                 goto err_expr_stateful;
2827
2828         err = nf_tables_newexpr(ctx, &expr_info, expr);
2829         if (err < 0)
2830                 goto err_expr_new;
2831
2832         return expr;
2833 err_expr_new:
2834         kfree(expr);
2835 err_expr_stateful:
2836         owner = expr_info.ops->type->owner;
2837         if (expr_info.ops->type->release_ops)
2838                 expr_info.ops->type->release_ops(expr_info.ops);
2839
2840         module_put(owner);
2841 err_expr_parse:
2842         return ERR_PTR(err);
2843 }
2844
2845 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2846 {
2847         int err;
2848
2849         if (src->ops->clone) {
2850                 dst->ops = src->ops;
2851                 err = src->ops->clone(dst, src);
2852                 if (err < 0)
2853                         return err;
2854         } else {
2855                 memcpy(dst, src, src->ops->size);
2856         }
2857
2858         __module_get(src->ops->type->owner);
2859
2860         return 0;
2861 }
2862
2863 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2864 {
2865         nf_tables_expr_destroy(ctx, expr);
2866         kfree(expr);
2867 }
2868
2869 /*
2870  * Rules
2871  */
2872
2873 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2874                                           u64 handle)
2875 {
2876         struct nft_rule *rule;
2877
2878         // FIXME: this sucks
2879         list_for_each_entry_rcu(rule, &chain->rules, list) {
2880                 if (handle == rule->handle)
2881                         return rule;
2882         }
2883
2884         return ERR_PTR(-ENOENT);
2885 }
2886
2887 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2888                                         const struct nlattr *nla)
2889 {
2890         if (nla == NULL)
2891                 return ERR_PTR(-EINVAL);
2892
2893         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2894 }
2895
2896 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2897         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2898                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2899         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2900                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2901         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2902         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2903         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2904         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2905         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2906                                     .len = NFT_USERDATA_MAXLEN },
2907         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2908         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2909         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2910 };
2911
2912 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2913                                     u32 portid, u32 seq, int event,
2914                                     u32 flags, int family,
2915                                     const struct nft_table *table,
2916                                     const struct nft_chain *chain,
2917                                     const struct nft_rule *rule, u64 handle)
2918 {
2919         struct nlmsghdr *nlh;
2920         const struct nft_expr *expr, *next;
2921         struct nlattr *list;
2922         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2923
2924         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
2925                            nft_base_seq(net));
2926         if (!nlh)
2927                 goto nla_put_failure;
2928
2929         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2930                 goto nla_put_failure;
2931         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2932                 goto nla_put_failure;
2933         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2934                          NFTA_RULE_PAD))
2935                 goto nla_put_failure;
2936
2937         if (event != NFT_MSG_DELRULE && handle) {
2938                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
2939                                  NFTA_RULE_PAD))
2940                         goto nla_put_failure;
2941         }
2942
2943         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2944                 nft_flow_rule_stats(chain, rule);
2945
2946         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2947         if (list == NULL)
2948                 goto nla_put_failure;
2949         nft_rule_for_each_expr(expr, next, rule) {
2950                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2951                         goto nla_put_failure;
2952         }
2953         nla_nest_end(skb, list);
2954
2955         if (rule->udata) {
2956                 struct nft_userdata *udata = nft_userdata(rule);
2957                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2958                             udata->data) < 0)
2959                         goto nla_put_failure;
2960         }
2961
2962         nlmsg_end(skb, nlh);
2963         return 0;
2964
2965 nla_put_failure:
2966         nlmsg_trim(skb, nlh);
2967         return -1;
2968 }
2969
2970 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2971                                   const struct nft_rule *rule, int event)
2972 {
2973         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2974         const struct nft_rule *prule;
2975         struct sk_buff *skb;
2976         u64 handle = 0;
2977         u16 flags = 0;
2978         int err;
2979
2980         if (!ctx->report &&
2981             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2982                 return;
2983
2984         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2985         if (skb == NULL)
2986                 goto err;
2987
2988         if (event == NFT_MSG_NEWRULE &&
2989             !list_is_first(&rule->list, &ctx->chain->rules) &&
2990             !list_is_last(&rule->list, &ctx->chain->rules)) {
2991                 prule = list_prev_entry(rule, list);
2992                 handle = prule->handle;
2993         }
2994         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
2995                 flags |= NLM_F_APPEND;
2996         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
2997                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
2998
2999         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3000                                        event, flags, ctx->family, ctx->table,
3001                                        ctx->chain, rule, handle);
3002         if (err < 0) {
3003                 kfree_skb(skb);
3004                 goto err;
3005         }
3006
3007         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3008         return;
3009 err:
3010         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3011 }
3012
3013 struct nft_rule_dump_ctx {
3014         char *table;
3015         char *chain;
3016 };
3017
3018 static int __nf_tables_dump_rules(struct sk_buff *skb,
3019                                   unsigned int *idx,
3020                                   struct netlink_callback *cb,
3021                                   const struct nft_table *table,
3022                                   const struct nft_chain *chain)
3023 {
3024         struct net *net = sock_net(skb->sk);
3025         const struct nft_rule *rule, *prule;
3026         unsigned int s_idx = cb->args[0];
3027         u64 handle;
3028
3029         prule = NULL;
3030         list_for_each_entry_rcu(rule, &chain->rules, list) {
3031                 if (!nft_is_active(net, rule))
3032                         goto cont_skip;
3033                 if (*idx < s_idx)
3034                         goto cont;
3035                 if (*idx > s_idx) {
3036                         memset(&cb->args[1], 0,
3037                                         sizeof(cb->args) - sizeof(cb->args[0]));
3038                 }
3039                 if (prule)
3040                         handle = prule->handle;
3041                 else
3042                         handle = 0;
3043
3044                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3045                                         cb->nlh->nlmsg_seq,
3046                                         NFT_MSG_NEWRULE,
3047                                         NLM_F_MULTI | NLM_F_APPEND,
3048                                         table->family,
3049                                         table, chain, rule, handle) < 0)
3050                         return 1;
3051
3052                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3053 cont:
3054                 prule = rule;
3055 cont_skip:
3056                 (*idx)++;
3057         }
3058         return 0;
3059 }
3060
3061 static int nf_tables_dump_rules(struct sk_buff *skb,
3062                                 struct netlink_callback *cb)
3063 {
3064         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3065         const struct nft_rule_dump_ctx *ctx = cb->data;
3066         struct nft_table *table;
3067         const struct nft_chain *chain;
3068         unsigned int idx = 0;
3069         struct net *net = sock_net(skb->sk);
3070         int family = nfmsg->nfgen_family;
3071         struct nftables_pernet *nft_net;
3072
3073         rcu_read_lock();
3074         nft_net = nft_pernet(net);
3075         cb->seq = READ_ONCE(nft_net->base_seq);
3076
3077         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3078                 if (family != NFPROTO_UNSPEC && family != table->family)
3079                         continue;
3080
3081                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3082                         continue;
3083
3084                 if (ctx && ctx->table && ctx->chain) {
3085                         struct rhlist_head *list, *tmp;
3086
3087                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3088                                                nft_chain_ht_params);
3089                         if (!list)
3090                                 goto done;
3091
3092                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3093                                 if (!nft_is_active(net, chain))
3094                                         continue;
3095                                 __nf_tables_dump_rules(skb, &idx,
3096                                                        cb, table, chain);
3097                                 break;
3098                         }
3099                         goto done;
3100                 }
3101
3102                 list_for_each_entry_rcu(chain, &table->chains, list) {
3103                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3104                                 goto done;
3105                 }
3106
3107                 if (ctx && ctx->table)
3108                         break;
3109         }
3110 done:
3111         rcu_read_unlock();
3112
3113         cb->args[0] = idx;
3114         return skb->len;
3115 }
3116
3117 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3118 {
3119         const struct nlattr * const *nla = cb->data;
3120         struct nft_rule_dump_ctx *ctx = NULL;
3121
3122         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3123                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3124                 if (!ctx)
3125                         return -ENOMEM;
3126
3127                 if (nla[NFTA_RULE_TABLE]) {
3128                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3129                                                         GFP_ATOMIC);
3130                         if (!ctx->table) {
3131                                 kfree(ctx);
3132                                 return -ENOMEM;
3133                         }
3134                 }
3135                 if (nla[NFTA_RULE_CHAIN]) {
3136                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3137                                                 GFP_ATOMIC);
3138                         if (!ctx->chain) {
3139                                 kfree(ctx->table);
3140                                 kfree(ctx);
3141                                 return -ENOMEM;
3142                         }
3143                 }
3144         }
3145
3146         cb->data = ctx;
3147         return 0;
3148 }
3149
3150 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3151 {
3152         struct nft_rule_dump_ctx *ctx = cb->data;
3153
3154         if (ctx) {
3155                 kfree(ctx->table);
3156                 kfree(ctx->chain);
3157                 kfree(ctx);
3158         }
3159         return 0;
3160 }
3161
3162 /* called with rcu_read_lock held */
3163 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3164                              const struct nlattr * const nla[])
3165 {
3166         struct netlink_ext_ack *extack = info->extack;
3167         u8 genmask = nft_genmask_cur(info->net);
3168         u8 family = info->nfmsg->nfgen_family;
3169         const struct nft_chain *chain;
3170         const struct nft_rule *rule;
3171         struct net *net = info->net;
3172         struct nft_table *table;
3173         struct sk_buff *skb2;
3174         int err;
3175
3176         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3177                 struct netlink_dump_control c = {
3178                         .start= nf_tables_dump_rules_start,
3179                         .dump = nf_tables_dump_rules,
3180                         .done = nf_tables_dump_rules_done,
3181                         .module = THIS_MODULE,
3182                         .data = (void *)nla,
3183                 };
3184
3185                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3186         }
3187
3188         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3189         if (IS_ERR(table)) {
3190                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3191                 return PTR_ERR(table);
3192         }
3193
3194         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3195         if (IS_ERR(chain)) {
3196                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3197                 return PTR_ERR(chain);
3198         }
3199
3200         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3201         if (IS_ERR(rule)) {
3202                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3203                 return PTR_ERR(rule);
3204         }
3205
3206         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3207         if (!skb2)
3208                 return -ENOMEM;
3209
3210         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3211                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3212                                        family, table, chain, rule, 0);
3213         if (err < 0)
3214                 goto err_fill_rule_info;
3215
3216         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3217
3218 err_fill_rule_info:
3219         kfree_skb(skb2);
3220         return err;
3221 }
3222
3223 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3224                                    struct nft_rule *rule)
3225 {
3226         struct nft_expr *expr, *next;
3227
3228         /*
3229          * Careful: some expressions might not be initialized in case this
3230          * is called on error from nf_tables_newrule().
3231          */
3232         expr = nft_expr_first(rule);
3233         while (nft_expr_more(rule, expr)) {
3234                 next = nft_expr_next(expr);
3235                 nf_tables_expr_destroy(ctx, expr);
3236                 expr = next;
3237         }
3238         kfree(rule);
3239 }
3240
3241 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3242 {
3243         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3244         nf_tables_rule_destroy(ctx, rule);
3245 }
3246
3247 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3248 {
3249         struct nft_expr *expr, *last;
3250         const struct nft_data *data;
3251         struct nft_rule *rule;
3252         int err;
3253
3254         if (ctx->level == NFT_JUMP_STACK_SIZE)
3255                 return -EMLINK;
3256
3257         list_for_each_entry(rule, &chain->rules, list) {
3258                 if (!nft_is_active_next(ctx->net, rule))
3259                         continue;
3260
3261                 nft_rule_for_each_expr(expr, last, rule) {
3262                         if (!expr->ops->validate)
3263                                 continue;
3264
3265                         err = expr->ops->validate(ctx, expr, &data);
3266                         if (err < 0)
3267                                 return err;
3268                 }
3269         }
3270
3271         return 0;
3272 }
3273 EXPORT_SYMBOL_GPL(nft_chain_validate);
3274
3275 static int nft_table_validate(struct net *net, const struct nft_table *table)
3276 {
3277         struct nft_chain *chain;
3278         struct nft_ctx ctx = {
3279                 .net    = net,
3280                 .family = table->family,
3281         };
3282         int err;
3283
3284         list_for_each_entry(chain, &table->chains, list) {
3285                 if (!nft_is_base_chain(chain))
3286                         continue;
3287
3288                 ctx.chain = chain;
3289                 err = nft_chain_validate(&ctx, chain);
3290                 if (err < 0)
3291                         return err;
3292         }
3293
3294         return 0;
3295 }
3296
3297 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3298                                              const struct nft_chain *chain,
3299                                              const struct nlattr *nla);
3300
3301 #define NFT_RULE_MAXEXPRS       128
3302
3303 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3304                              const struct nlattr * const nla[])
3305 {
3306         struct nftables_pernet *nft_net = nft_pernet(info->net);
3307         struct netlink_ext_ack *extack = info->extack;
3308         unsigned int size, i, n, ulen = 0, usize = 0;
3309         u8 genmask = nft_genmask_next(info->net);
3310         struct nft_rule *rule, *old_rule = NULL;
3311         struct nft_expr_info *expr_info = NULL;
3312         u8 family = info->nfmsg->nfgen_family;
3313         struct nft_flow_rule *flow = NULL;
3314         struct net *net = info->net;
3315         struct nft_userdata *udata;
3316         struct nft_table *table;
3317         struct nft_chain *chain;
3318         struct nft_trans *trans;
3319         u64 handle, pos_handle;
3320         struct nft_expr *expr;
3321         struct nft_ctx ctx;
3322         struct nlattr *tmp;
3323         int err, rem;
3324
3325         lockdep_assert_held(&nft_net->commit_mutex);
3326
3327         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3328                                  NETLINK_CB(skb).portid);
3329         if (IS_ERR(table)) {
3330                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3331                 return PTR_ERR(table);
3332         }
3333
3334         if (nla[NFTA_RULE_CHAIN]) {
3335                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3336                                          genmask);
3337                 if (IS_ERR(chain)) {
3338                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3339                         return PTR_ERR(chain);
3340                 }
3341                 if (nft_chain_is_bound(chain))
3342                         return -EOPNOTSUPP;
3343
3344         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3345                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3346                 if (IS_ERR(chain)) {
3347                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3348                         return PTR_ERR(chain);
3349                 }
3350         } else {
3351                 return -EINVAL;
3352         }
3353
3354         if (nla[NFTA_RULE_HANDLE]) {
3355                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3356                 rule = __nft_rule_lookup(chain, handle);
3357                 if (IS_ERR(rule)) {
3358                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3359                         return PTR_ERR(rule);
3360                 }
3361
3362                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3363                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3364                         return -EEXIST;
3365                 }
3366                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3367                         old_rule = rule;
3368                 else
3369                         return -EOPNOTSUPP;
3370         } else {
3371                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3372                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3373                         return -EINVAL;
3374                 handle = nf_tables_alloc_handle(table);
3375
3376                 if (chain->use == UINT_MAX)
3377                         return -EOVERFLOW;
3378
3379                 if (nla[NFTA_RULE_POSITION]) {
3380                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3381                         old_rule = __nft_rule_lookup(chain, pos_handle);
3382                         if (IS_ERR(old_rule)) {
3383                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3384                                 return PTR_ERR(old_rule);
3385                         }
3386                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3387                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3388                         if (IS_ERR(old_rule)) {
3389                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3390                                 return PTR_ERR(old_rule);
3391                         }
3392                 }
3393         }
3394
3395         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3396
3397         n = 0;
3398         size = 0;
3399         if (nla[NFTA_RULE_EXPRESSIONS]) {
3400                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3401                                            sizeof(struct nft_expr_info),
3402                                            GFP_KERNEL);
3403                 if (!expr_info)
3404                         return -ENOMEM;
3405
3406                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3407                         err = -EINVAL;
3408                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3409                                 goto err_release_expr;
3410                         if (n == NFT_RULE_MAXEXPRS)
3411                                 goto err_release_expr;
3412                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3413                         if (err < 0) {
3414                                 NL_SET_BAD_ATTR(extack, tmp);
3415                                 goto err_release_expr;
3416                         }
3417                         size += expr_info[n].ops->size;
3418                         n++;
3419                 }
3420         }
3421         /* Check for overflow of dlen field */
3422         err = -EFBIG;
3423         if (size >= 1 << 12)
3424                 goto err_release_expr;
3425
3426         if (nla[NFTA_RULE_USERDATA]) {
3427                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3428                 if (ulen > 0)
3429                         usize = sizeof(struct nft_userdata) + ulen;
3430         }
3431
3432         err = -ENOMEM;
3433         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3434         if (rule == NULL)
3435                 goto err_release_expr;
3436
3437         nft_activate_next(net, rule);
3438
3439         rule->handle = handle;
3440         rule->dlen   = size;
3441         rule->udata  = ulen ? 1 : 0;
3442
3443         if (ulen) {
3444                 udata = nft_userdata(rule);
3445                 udata->len = ulen - 1;
3446                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3447         }
3448
3449         expr = nft_expr_first(rule);
3450         for (i = 0; i < n; i++) {
3451                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3452                 if (err < 0) {
3453                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3454                         goto err_release_rule;
3455                 }
3456
3457                 if (expr_info[i].ops->validate)
3458                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3459
3460                 expr_info[i].ops = NULL;
3461                 expr = nft_expr_next(expr);
3462         }
3463
3464         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3465                 flow = nft_flow_rule_create(net, rule);
3466                 if (IS_ERR(flow)) {
3467                         err = PTR_ERR(flow);
3468                         goto err_release_rule;
3469                 }
3470         }
3471
3472         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3473                 err = nft_delrule(&ctx, old_rule);
3474                 if (err < 0)
3475                         goto err_destroy_flow_rule;
3476
3477                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3478                 if (trans == NULL) {
3479                         err = -ENOMEM;
3480                         goto err_destroy_flow_rule;
3481                 }
3482                 list_add_tail_rcu(&rule->list, &old_rule->list);
3483         } else {
3484                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3485                 if (!trans) {
3486                         err = -ENOMEM;
3487                         goto err_destroy_flow_rule;
3488                 }
3489
3490                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3491                         if (old_rule)
3492                                 list_add_rcu(&rule->list, &old_rule->list);
3493                         else
3494                                 list_add_tail_rcu(&rule->list, &chain->rules);
3495                  } else {
3496                         if (old_rule)
3497                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3498                         else
3499                                 list_add_rcu(&rule->list, &chain->rules);
3500                 }
3501         }
3502         kvfree(expr_info);
3503         chain->use++;
3504
3505         if (flow)
3506                 nft_trans_flow_rule(trans) = flow;
3507
3508         if (nft_net->validate_state == NFT_VALIDATE_DO)
3509                 return nft_table_validate(net, table);
3510
3511         return 0;
3512
3513 err_destroy_flow_rule:
3514         if (flow)
3515                 nft_flow_rule_destroy(flow);
3516 err_release_rule:
3517         nf_tables_rule_release(&ctx, rule);
3518 err_release_expr:
3519         for (i = 0; i < n; i++) {
3520                 if (expr_info[i].ops) {
3521                         module_put(expr_info[i].ops->type->owner);
3522                         if (expr_info[i].ops->type->release_ops)
3523                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3524                 }
3525         }
3526         kvfree(expr_info);
3527
3528         return err;
3529 }
3530
3531 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3532                                              const struct nft_chain *chain,
3533                                              const struct nlattr *nla)
3534 {
3535         struct nftables_pernet *nft_net = nft_pernet(net);
3536         u32 id = ntohl(nla_get_be32(nla));
3537         struct nft_trans *trans;
3538
3539         list_for_each_entry(trans, &nft_net->commit_list, list) {
3540                 struct nft_rule *rule = nft_trans_rule(trans);
3541
3542                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3543                     trans->ctx.chain == chain &&
3544                     id == nft_trans_rule_id(trans))
3545                         return rule;
3546         }
3547         return ERR_PTR(-ENOENT);
3548 }
3549
3550 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3551                              const struct nlattr * const nla[])
3552 {
3553         struct netlink_ext_ack *extack = info->extack;
3554         u8 genmask = nft_genmask_next(info->net);
3555         u8 family = info->nfmsg->nfgen_family;
3556         struct nft_chain *chain = NULL;
3557         struct net *net = info->net;
3558         struct nft_table *table;
3559         struct nft_rule *rule;
3560         struct nft_ctx ctx;
3561         int err = 0;
3562
3563         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3564                                  NETLINK_CB(skb).portid);
3565         if (IS_ERR(table)) {
3566                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3567                 return PTR_ERR(table);
3568         }
3569
3570         if (nla[NFTA_RULE_CHAIN]) {
3571                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3572                                          genmask);
3573                 if (IS_ERR(chain)) {
3574                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3575                         return PTR_ERR(chain);
3576                 }
3577                 if (nft_chain_is_bound(chain))
3578                         return -EOPNOTSUPP;
3579         }
3580
3581         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3582
3583         if (chain) {
3584                 if (nla[NFTA_RULE_HANDLE]) {
3585                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3586                         if (IS_ERR(rule)) {
3587                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3588                                 return PTR_ERR(rule);
3589                         }
3590
3591                         err = nft_delrule(&ctx, rule);
3592                 } else if (nla[NFTA_RULE_ID]) {
3593                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3594                         if (IS_ERR(rule)) {
3595                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3596                                 return PTR_ERR(rule);
3597                         }
3598
3599                         err = nft_delrule(&ctx, rule);
3600                 } else {
3601                         err = nft_delrule_by_chain(&ctx);
3602                 }
3603         } else {
3604                 list_for_each_entry(chain, &table->chains, list) {
3605                         if (!nft_is_active_next(net, chain))
3606                                 continue;
3607
3608                         ctx.chain = chain;
3609                         err = nft_delrule_by_chain(&ctx);
3610                         if (err < 0)
3611                                 break;
3612                 }
3613         }
3614
3615         return err;
3616 }
3617
3618 /*
3619  * Sets
3620  */
3621 static const struct nft_set_type *nft_set_types[] = {
3622         &nft_set_hash_fast_type,
3623         &nft_set_hash_type,
3624         &nft_set_rhash_type,
3625         &nft_set_bitmap_type,
3626         &nft_set_rbtree_type,
3627 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3628         &nft_set_pipapo_avx2_type,
3629 #endif
3630         &nft_set_pipapo_type,
3631 };
3632
3633 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3634                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3635                                  NFT_SET_EVAL)
3636
3637 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3638 {
3639         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3640 }
3641
3642 /*
3643  * Select a set implementation based on the data characteristics and the
3644  * given policy. The total memory use might not be known if no size is
3645  * given, in that case the amount of memory per element is used.
3646  */
3647 static const struct nft_set_ops *
3648 nft_select_set_ops(const struct nft_ctx *ctx,
3649                    const struct nlattr * const nla[],
3650                    const struct nft_set_desc *desc)
3651 {
3652         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3653         const struct nft_set_ops *ops, *bops;
3654         struct nft_set_estimate est, best;
3655         const struct nft_set_type *type;
3656         u32 flags = 0;
3657         int i;
3658
3659         lockdep_assert_held(&nft_net->commit_mutex);
3660         lockdep_nfnl_nft_mutex_not_held();
3661
3662         if (nla[NFTA_SET_FLAGS] != NULL)
3663                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3664
3665         bops        = NULL;
3666         best.size   = ~0;
3667         best.lookup = ~0;
3668         best.space  = ~0;
3669
3670         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3671                 type = nft_set_types[i];
3672                 ops = &type->ops;
3673
3674                 if (!nft_set_ops_candidate(type, flags))
3675                         continue;
3676                 if (!ops->estimate(desc, flags, &est))
3677                         continue;
3678
3679                 switch (desc->policy) {
3680                 case NFT_SET_POL_PERFORMANCE:
3681                         if (est.lookup < best.lookup)
3682                                 break;
3683                         if (est.lookup == best.lookup &&
3684                             est.space < best.space)
3685                                 break;
3686                         continue;
3687                 case NFT_SET_POL_MEMORY:
3688                         if (!desc->size) {
3689                                 if (est.space < best.space)
3690                                         break;
3691                                 if (est.space == best.space &&
3692                                     est.lookup < best.lookup)
3693                                         break;
3694                         } else if (est.size < best.size || !bops) {
3695                                 break;
3696                         }
3697                         continue;
3698                 default:
3699                         break;
3700                 }
3701
3702                 bops = ops;
3703                 best = est;
3704         }
3705
3706         if (bops != NULL)
3707                 return bops;
3708
3709         return ERR_PTR(-EOPNOTSUPP);
3710 }
3711
3712 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3713         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3714                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3715         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3716                                             .len = NFT_SET_MAXNAMELEN - 1 },
3717         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3718         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3719         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3720         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3721         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3722         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3723         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3724         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3725         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3726         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3727         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3728                                             .len  = NFT_USERDATA_MAXLEN },
3729         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3730         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3731         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3732         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3733 };
3734
3735 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3736         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3737         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3738 };
3739
3740 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3741                                       const struct nlattr *nla, u8 genmask)
3742 {
3743         struct nft_set *set;
3744
3745         if (nla == NULL)
3746                 return ERR_PTR(-EINVAL);
3747
3748         list_for_each_entry_rcu(set, &table->sets, list) {
3749                 if (!nla_strcmp(nla, set->name) &&
3750                     nft_active_genmask(set, genmask))
3751                         return set;
3752         }
3753         return ERR_PTR(-ENOENT);
3754 }
3755
3756 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3757                                                const struct nlattr *nla,
3758                                                u8 genmask)
3759 {
3760         struct nft_set *set;
3761
3762         list_for_each_entry(set, &table->sets, list) {
3763                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3764                     nft_active_genmask(set, genmask))
3765                         return set;
3766         }
3767         return ERR_PTR(-ENOENT);
3768 }
3769
3770 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3771                                            const struct nft_table *table,
3772                                            const struct nlattr *nla, u8 genmask)
3773 {
3774         struct nftables_pernet *nft_net = nft_pernet(net);
3775         u32 id = ntohl(nla_get_be32(nla));
3776         struct nft_trans *trans;
3777
3778         list_for_each_entry(trans, &nft_net->commit_list, list) {
3779                 if (trans->msg_type == NFT_MSG_NEWSET) {
3780                         struct nft_set *set = nft_trans_set(trans);
3781
3782                         if (id == nft_trans_set_id(trans) &&
3783                             set->table == table &&
3784                             nft_active_genmask(set, genmask))
3785                                 return set;
3786                 }
3787         }
3788         return ERR_PTR(-ENOENT);
3789 }
3790
3791 struct nft_set *nft_set_lookup_global(const struct net *net,
3792                                       const struct nft_table *table,
3793                                       const struct nlattr *nla_set_name,
3794                                       const struct nlattr *nla_set_id,
3795                                       u8 genmask)
3796 {
3797         struct nft_set *set;
3798
3799         set = nft_set_lookup(table, nla_set_name, genmask);
3800         if (IS_ERR(set)) {
3801                 if (!nla_set_id)
3802                         return set;
3803
3804                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
3805         }
3806         return set;
3807 }
3808 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3809
3810 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3811                                     const char *name)
3812 {
3813         const struct nft_set *i;
3814         const char *p;
3815         unsigned long *inuse;
3816         unsigned int n = 0, min = 0;
3817
3818         p = strchr(name, '%');
3819         if (p != NULL) {
3820                 if (p[1] != 'd' || strchr(p + 2, '%'))
3821                         return -EINVAL;
3822
3823                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3824                 if (inuse == NULL)
3825                         return -ENOMEM;
3826 cont:
3827                 list_for_each_entry(i, &ctx->table->sets, list) {
3828                         int tmp;
3829
3830                         if (!nft_is_active_next(ctx->net, i))
3831                                 continue;
3832                         if (!sscanf(i->name, name, &tmp))
3833                                 continue;
3834                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3835                                 continue;
3836
3837                         set_bit(tmp - min, inuse);
3838                 }
3839
3840                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3841                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3842                         min += BITS_PER_BYTE * PAGE_SIZE;
3843                         memset(inuse, 0, PAGE_SIZE);
3844                         goto cont;
3845                 }
3846                 free_page((unsigned long)inuse);
3847         }
3848
3849         set->name = kasprintf(GFP_KERNEL, name, min + n);
3850         if (!set->name)
3851                 return -ENOMEM;
3852
3853         list_for_each_entry(i, &ctx->table->sets, list) {
3854                 if (!nft_is_active_next(ctx->net, i))
3855                         continue;
3856                 if (!strcmp(set->name, i->name)) {
3857                         kfree(set->name);
3858                         set->name = NULL;
3859                         return -ENFILE;
3860                 }
3861         }
3862         return 0;
3863 }
3864
3865 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3866 {
3867         u64 ms = be64_to_cpu(nla_get_be64(nla));
3868         u64 max = (u64)(~((u64)0));
3869
3870         max = div_u64(max, NSEC_PER_MSEC);
3871         if (ms >= max)
3872                 return -ERANGE;
3873
3874         ms *= NSEC_PER_MSEC;
3875         *result = nsecs_to_jiffies64(ms);
3876         return 0;
3877 }
3878
3879 __be64 nf_jiffies64_to_msecs(u64 input)
3880 {
3881         return cpu_to_be64(jiffies64_to_msecs(input));
3882 }
3883
3884 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3885                                      const struct nft_set *set)
3886 {
3887         struct nlattr *concat, *field;
3888         int i;
3889
3890         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3891         if (!concat)
3892                 return -ENOMEM;
3893
3894         for (i = 0; i < set->field_count; i++) {
3895                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3896                 if (!field)
3897                         return -ENOMEM;
3898
3899                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3900                                  htonl(set->field_len[i])))
3901                         return -ENOMEM;
3902
3903                 nla_nest_end(skb, field);
3904         }
3905
3906         nla_nest_end(skb, concat);
3907
3908         return 0;
3909 }
3910
3911 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3912                               const struct nft_set *set, u16 event, u16 flags)
3913 {
3914         u64 timeout = READ_ONCE(set->timeout);
3915         u32 gc_int = READ_ONCE(set->gc_int);
3916         u32 portid = ctx->portid;
3917         struct nlmsghdr *nlh;
3918         struct nlattr *nest;
3919         u32 seq = ctx->seq;
3920         int i;
3921
3922         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3923         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3924                            NFNETLINK_V0, nft_base_seq(ctx->net));
3925         if (!nlh)
3926                 goto nla_put_failure;
3927
3928         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3929                 goto nla_put_failure;
3930         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3931                 goto nla_put_failure;
3932         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3933                          NFTA_SET_PAD))
3934                 goto nla_put_failure;
3935         if (set->flags != 0)
3936                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3937                         goto nla_put_failure;
3938
3939         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3940                 goto nla_put_failure;
3941         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3942                 goto nla_put_failure;
3943         if (set->flags & NFT_SET_MAP) {
3944                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3945                         goto nla_put_failure;
3946                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3947                         goto nla_put_failure;
3948         }
3949         if (set->flags & NFT_SET_OBJECT &&
3950             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3951                 goto nla_put_failure;
3952
3953         if (timeout &&
3954             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3955                          nf_jiffies64_to_msecs(timeout),
3956                          NFTA_SET_PAD))
3957                 goto nla_put_failure;
3958         if (gc_int &&
3959             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
3960                 goto nla_put_failure;
3961
3962         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3963                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3964                         goto nla_put_failure;
3965         }
3966
3967         if (set->udata &&
3968             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3969                 goto nla_put_failure;
3970
3971         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3972         if (!nest)
3973                 goto nla_put_failure;
3974         if (set->size &&
3975             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3976                 goto nla_put_failure;
3977
3978         if (set->field_count > 1 &&
3979             nf_tables_fill_set_concat(skb, set))
3980                 goto nla_put_failure;
3981
3982         nla_nest_end(skb, nest);
3983
3984         if (set->num_exprs == 1) {
3985                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3986                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3987                         goto nla_put_failure;
3988
3989                 nla_nest_end(skb, nest);
3990         } else if (set->num_exprs > 1) {
3991                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3992                 if (nest == NULL)
3993                         goto nla_put_failure;
3994
3995                 for (i = 0; i < set->num_exprs; i++) {
3996                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3997                                           set->exprs[i]) < 0)
3998                                 goto nla_put_failure;
3999                 }
4000                 nla_nest_end(skb, nest);
4001         }
4002
4003         nlmsg_end(skb, nlh);
4004         return 0;
4005
4006 nla_put_failure:
4007         nlmsg_trim(skb, nlh);
4008         return -1;
4009 }
4010
4011 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4012                                  const struct nft_set *set, int event,
4013                                  gfp_t gfp_flags)
4014 {
4015         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4016         u32 portid = ctx->portid;
4017         struct sk_buff *skb;
4018         u16 flags = 0;
4019         int err;
4020
4021         if (!ctx->report &&
4022             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4023                 return;
4024
4025         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4026         if (skb == NULL)
4027                 goto err;
4028
4029         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4030                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4031
4032         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4033         if (err < 0) {
4034                 kfree_skb(skb);
4035                 goto err;
4036         }
4037
4038         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4039         return;
4040 err:
4041         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4042 }
4043
4044 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4045 {
4046         const struct nft_set *set;
4047         unsigned int idx, s_idx = cb->args[0];
4048         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4049         struct net *net = sock_net(skb->sk);
4050         struct nft_ctx *ctx = cb->data, ctx_set;
4051         struct nftables_pernet *nft_net;
4052
4053         if (cb->args[1])
4054                 return skb->len;
4055
4056         rcu_read_lock();
4057         nft_net = nft_pernet(net);
4058         cb->seq = READ_ONCE(nft_net->base_seq);
4059
4060         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4061                 if (ctx->family != NFPROTO_UNSPEC &&
4062                     ctx->family != table->family)
4063                         continue;
4064
4065                 if (ctx->table && ctx->table != table)
4066                         continue;
4067
4068                 if (cur_table) {
4069                         if (cur_table != table)
4070                                 continue;
4071
4072                         cur_table = NULL;
4073                 }
4074                 idx = 0;
4075                 list_for_each_entry_rcu(set, &table->sets, list) {
4076                         if (idx < s_idx)
4077                                 goto cont;
4078                         if (!nft_is_active(net, set))
4079                                 goto cont;
4080
4081                         ctx_set = *ctx;
4082                         ctx_set.table = table;
4083                         ctx_set.family = table->family;
4084
4085                         if (nf_tables_fill_set(skb, &ctx_set, set,
4086                                                NFT_MSG_NEWSET,
4087                                                NLM_F_MULTI) < 0) {
4088                                 cb->args[0] = idx;
4089                                 cb->args[2] = (unsigned long) table;
4090                                 goto done;
4091                         }
4092                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4093 cont:
4094                         idx++;
4095                 }
4096                 if (s_idx)
4097                         s_idx = 0;
4098         }
4099         cb->args[1] = 1;
4100 done:
4101         rcu_read_unlock();
4102         return skb->len;
4103 }
4104
4105 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4106 {
4107         struct nft_ctx *ctx_dump = NULL;
4108
4109         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4110         if (ctx_dump == NULL)
4111                 return -ENOMEM;
4112
4113         cb->data = ctx_dump;
4114         return 0;
4115 }
4116
4117 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4118 {
4119         kfree(cb->data);
4120         return 0;
4121 }
4122
4123 /* called with rcu_read_lock held */
4124 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4125                             const struct nlattr * const nla[])
4126 {
4127         struct netlink_ext_ack *extack = info->extack;
4128         u8 genmask = nft_genmask_cur(info->net);
4129         u8 family = info->nfmsg->nfgen_family;
4130         struct nft_table *table = NULL;
4131         struct net *net = info->net;
4132         const struct nft_set *set;
4133         struct sk_buff *skb2;
4134         struct nft_ctx ctx;
4135         int err;
4136
4137         if (nla[NFTA_SET_TABLE]) {
4138                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4139                                          genmask, 0);
4140                 if (IS_ERR(table)) {
4141                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4142                         return PTR_ERR(table);
4143                 }
4144         }
4145
4146         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4147
4148         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4149                 struct netlink_dump_control c = {
4150                         .start = nf_tables_dump_sets_start,
4151                         .dump = nf_tables_dump_sets,
4152                         .done = nf_tables_dump_sets_done,
4153                         .data = &ctx,
4154                         .module = THIS_MODULE,
4155                 };
4156
4157                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4158         }
4159
4160         /* Only accept unspec with dump */
4161         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4162                 return -EAFNOSUPPORT;
4163         if (!nla[NFTA_SET_TABLE])
4164                 return -EINVAL;
4165
4166         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4167         if (IS_ERR(set))
4168                 return PTR_ERR(set);
4169
4170         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4171         if (skb2 == NULL)
4172                 return -ENOMEM;
4173
4174         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4175         if (err < 0)
4176                 goto err_fill_set_info;
4177
4178         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4179
4180 err_fill_set_info:
4181         kfree_skb(skb2);
4182         return err;
4183 }
4184
4185 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4186         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4187 };
4188
4189 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4190                                      struct nft_set_desc *desc)
4191 {
4192         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4193         u32 len;
4194         int err;
4195
4196         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4197                 return -E2BIG;
4198
4199         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4200                                           nft_concat_policy, NULL);
4201         if (err < 0)
4202                 return err;
4203
4204         if (!tb[NFTA_SET_FIELD_LEN])
4205                 return -EINVAL;
4206
4207         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4208         if (!len || len > U8_MAX)
4209                 return -EINVAL;
4210
4211         desc->field_len[desc->field_count++] = len;
4212
4213         return 0;
4214 }
4215
4216 static int nft_set_desc_concat(struct nft_set_desc *desc,
4217                                const struct nlattr *nla)
4218 {
4219         struct nlattr *attr;
4220         u32 num_regs = 0;
4221         int rem, err, i;
4222
4223         nla_for_each_nested(attr, nla, rem) {
4224                 if (nla_type(attr) != NFTA_LIST_ELEM)
4225                         return -EINVAL;
4226
4227                 err = nft_set_desc_concat_parse(attr, desc);
4228                 if (err < 0)
4229                         return err;
4230         }
4231
4232         for (i = 0; i < desc->field_count; i++)
4233                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4234
4235         if (num_regs > NFT_REG32_COUNT)
4236                 return -E2BIG;
4237
4238         return 0;
4239 }
4240
4241 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4242                                     const struct nlattr *nla)
4243 {
4244         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4245         int err;
4246
4247         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4248                                           nft_set_desc_policy, NULL);
4249         if (err < 0)
4250                 return err;
4251
4252         if (da[NFTA_SET_DESC_SIZE] != NULL)
4253                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4254         if (da[NFTA_SET_DESC_CONCAT])
4255                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4256
4257         return err;
4258 }
4259
4260 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4261                               const struct nlattr * const *nla,
4262                               struct nft_expr **exprs, int *num_exprs,
4263                               u32 flags)
4264 {
4265         struct nft_expr *expr;
4266         int err, i;
4267
4268         if (nla[NFTA_SET_EXPR]) {
4269                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4270                 if (IS_ERR(expr)) {
4271                         err = PTR_ERR(expr);
4272                         goto err_set_expr_alloc;
4273                 }
4274                 exprs[0] = expr;
4275                 (*num_exprs)++;
4276         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4277                 struct nlattr *tmp;
4278                 int left;
4279
4280                 if (!(flags & NFT_SET_EXPR)) {
4281                         err = -EINVAL;
4282                         goto err_set_expr_alloc;
4283                 }
4284                 i = 0;
4285                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4286                         if (i == NFT_SET_EXPR_MAX) {
4287                                 err = -E2BIG;
4288                                 goto err_set_expr_alloc;
4289                         }
4290                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4291                                 err = -EINVAL;
4292                                 goto err_set_expr_alloc;
4293                         }
4294                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4295                         if (IS_ERR(expr)) {
4296                                 err = PTR_ERR(expr);
4297                                 goto err_set_expr_alloc;
4298                         }
4299                         exprs[i++] = expr;
4300                         (*num_exprs)++;
4301                 }
4302         }
4303
4304         return 0;
4305
4306 err_set_expr_alloc:
4307         for (i = 0; i < *num_exprs; i++)
4308                 nft_expr_destroy(ctx, exprs[i]);
4309
4310         return err;
4311 }
4312
4313 static bool nft_set_is_same(const struct nft_set *set,
4314                             const struct nft_set_desc *desc,
4315                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4316 {
4317         int i;
4318
4319         if (set->ktype != desc->ktype ||
4320             set->dtype != desc->dtype ||
4321             set->flags != flags ||
4322             set->klen != desc->klen ||
4323             set->dlen != desc->dlen ||
4324             set->field_count != desc->field_count ||
4325             set->num_exprs != num_exprs)
4326                 return false;
4327
4328         for (i = 0; i < desc->field_count; i++) {
4329                 if (set->field_len[i] != desc->field_len[i])
4330                         return false;
4331         }
4332
4333         for (i = 0; i < num_exprs; i++) {
4334                 if (set->exprs[i]->ops != exprs[i]->ops)
4335                         return false;
4336         }
4337
4338         return true;
4339 }
4340
4341 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4342                             const struct nlattr * const nla[])
4343 {
4344         struct netlink_ext_ack *extack = info->extack;
4345         u8 genmask = nft_genmask_next(info->net);
4346         u8 family = info->nfmsg->nfgen_family;
4347         const struct nft_set_ops *ops;
4348         struct net *net = info->net;
4349         struct nft_set_desc desc;
4350         struct nft_table *table;
4351         unsigned char *udata;
4352         struct nft_set *set;
4353         struct nft_ctx ctx;
4354         size_t alloc_size;
4355         int num_exprs = 0;
4356         char *name;
4357         int err, i;
4358         u16 udlen;
4359         u32 flags;
4360         u64 size;
4361
4362         if (nla[NFTA_SET_TABLE] == NULL ||
4363             nla[NFTA_SET_NAME] == NULL ||
4364             nla[NFTA_SET_KEY_LEN] == NULL ||
4365             nla[NFTA_SET_ID] == NULL)
4366                 return -EINVAL;
4367
4368         memset(&desc, 0, sizeof(desc));
4369
4370         desc.ktype = NFT_DATA_VALUE;
4371         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4372                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4373                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4374                         return -EINVAL;
4375         }
4376
4377         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4378         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4379                 return -EINVAL;
4380
4381         flags = 0;
4382         if (nla[NFTA_SET_FLAGS] != NULL) {
4383                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4384                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4385                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4386                               NFT_SET_MAP | NFT_SET_EVAL |
4387                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4388                         return -EOPNOTSUPP;
4389                 /* Only one of these operations is supported */
4390                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4391                              (NFT_SET_MAP | NFT_SET_OBJECT))
4392                         return -EOPNOTSUPP;
4393                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4394                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4395                         return -EOPNOTSUPP;
4396         }
4397
4398         desc.dtype = 0;
4399         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4400                 if (!(flags & NFT_SET_MAP))
4401                         return -EINVAL;
4402
4403                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4404                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4405                     desc.dtype != NFT_DATA_VERDICT)
4406                         return -EINVAL;
4407
4408                 if (desc.dtype != NFT_DATA_VERDICT) {
4409                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4410                                 return -EINVAL;
4411                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4412                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4413                                 return -EINVAL;
4414                 } else
4415                         desc.dlen = sizeof(struct nft_verdict);
4416         } else if (flags & NFT_SET_MAP)
4417                 return -EINVAL;
4418
4419         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4420                 if (!(flags & NFT_SET_OBJECT))
4421                         return -EINVAL;
4422
4423                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4424                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4425                     desc.objtype > NFT_OBJECT_MAX)
4426                         return -EOPNOTSUPP;
4427         } else if (flags & NFT_SET_OBJECT)
4428                 return -EINVAL;
4429         else
4430                 desc.objtype = NFT_OBJECT_UNSPEC;
4431
4432         desc.timeout = 0;
4433         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4434                 if (!(flags & NFT_SET_TIMEOUT))
4435                         return -EINVAL;
4436
4437                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4438                 if (err)
4439                         return err;
4440         }
4441         desc.gc_int = 0;
4442         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4443                 if (!(flags & NFT_SET_TIMEOUT))
4444                         return -EINVAL;
4445                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4446         }
4447
4448         desc.policy = NFT_SET_POL_PERFORMANCE;
4449         if (nla[NFTA_SET_POLICY] != NULL)
4450                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4451
4452         if (nla[NFTA_SET_DESC] != NULL) {
4453                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4454                 if (err < 0)
4455                         return err;
4456
4457                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4458                         return -EINVAL;
4459         } else if (flags & NFT_SET_CONCAT) {
4460                 return -EINVAL;
4461         }
4462
4463         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4464                 desc.expr = true;
4465
4466         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4467                                  NETLINK_CB(skb).portid);
4468         if (IS_ERR(table)) {
4469                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4470                 return PTR_ERR(table);
4471         }
4472
4473         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4474
4475         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4476         if (IS_ERR(set)) {
4477                 if (PTR_ERR(set) != -ENOENT) {
4478                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4479                         return PTR_ERR(set);
4480                 }
4481         } else {
4482                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4483
4484                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4485                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4486                         return -EEXIST;
4487                 }
4488                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4489                         return -EOPNOTSUPP;
4490
4491                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4492                 if (err < 0)
4493                         return err;
4494
4495                 err = 0;
4496                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4497                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4498                         err = -EEXIST;
4499                 }
4500
4501                 for (i = 0; i < num_exprs; i++)
4502                         nft_expr_destroy(&ctx, exprs[i]);
4503
4504                 if (err < 0)
4505                         return err;
4506
4507                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4508         }
4509
4510         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4511                 return -ENOENT;
4512
4513         ops = nft_select_set_ops(&ctx, nla, &desc);
4514         if (IS_ERR(ops))
4515                 return PTR_ERR(ops);
4516
4517         udlen = 0;
4518         if (nla[NFTA_SET_USERDATA])
4519                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4520
4521         size = 0;
4522         if (ops->privsize != NULL)
4523                 size = ops->privsize(nla, &desc);
4524         alloc_size = sizeof(*set) + size + udlen;
4525         if (alloc_size < size || alloc_size > INT_MAX)
4526                 return -ENOMEM;
4527         set = kvzalloc(alloc_size, GFP_KERNEL);
4528         if (!set)
4529                 return -ENOMEM;
4530
4531         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4532         if (!name) {
4533                 err = -ENOMEM;
4534                 goto err_set_name;
4535         }
4536
4537         err = nf_tables_set_alloc_name(&ctx, set, name);
4538         kfree(name);
4539         if (err < 0)
4540                 goto err_set_name;
4541
4542         udata = NULL;
4543         if (udlen) {
4544                 udata = set->data + size;
4545                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4546         }
4547
4548         INIT_LIST_HEAD(&set->bindings);
4549         INIT_LIST_HEAD(&set->catchall_list);
4550         set->table = table;
4551         write_pnet(&set->net, net);
4552         set->ops = ops;
4553         set->ktype = desc.ktype;
4554         set->klen = desc.klen;
4555         set->dtype = desc.dtype;
4556         set->objtype = desc.objtype;
4557         set->dlen = desc.dlen;
4558         set->flags = flags;
4559         set->size = desc.size;
4560         set->policy = desc.policy;
4561         set->udlen = udlen;
4562         set->udata = udata;
4563         set->timeout = desc.timeout;
4564         set->gc_int = desc.gc_int;
4565
4566         set->field_count = desc.field_count;
4567         for (i = 0; i < desc.field_count; i++)
4568                 set->field_len[i] = desc.field_len[i];
4569
4570         err = ops->init(set, &desc, nla);
4571         if (err < 0)
4572                 goto err_set_init;
4573
4574         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4575         if (err < 0)
4576                 goto err_set_destroy;
4577
4578         set->num_exprs = num_exprs;
4579         set->handle = nf_tables_alloc_handle(table);
4580
4581         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4582         if (err < 0)
4583                 goto err_set_expr_alloc;
4584
4585         list_add_tail_rcu(&set->list, &table->sets);
4586         table->use++;
4587         return 0;
4588
4589 err_set_expr_alloc:
4590         for (i = 0; i < set->num_exprs; i++)
4591                 nft_expr_destroy(&ctx, set->exprs[i]);
4592 err_set_destroy:
4593         ops->destroy(set);
4594 err_set_init:
4595         kfree(set->name);
4596 err_set_name:
4597         kvfree(set);
4598         return err;
4599 }
4600
4601 struct nft_set_elem_catchall {
4602         struct list_head        list;
4603         struct rcu_head         rcu;
4604         void                    *elem;
4605 };
4606
4607 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4608                                      struct nft_set *set)
4609 {
4610         struct nft_set_elem_catchall *next, *catchall;
4611
4612         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4613                 list_del_rcu(&catchall->list);
4614                 nft_set_elem_destroy(set, catchall->elem, true);
4615                 kfree_rcu(catchall, rcu);
4616         }
4617 }
4618
4619 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4620 {
4621         int i;
4622
4623         if (WARN_ON(set->use > 0))
4624                 return;
4625
4626         for (i = 0; i < set->num_exprs; i++)
4627                 nft_expr_destroy(ctx, set->exprs[i]);
4628
4629         set->ops->destroy(set);
4630         nft_set_catchall_destroy(ctx, set);
4631         kfree(set->name);
4632         kvfree(set);
4633 }
4634
4635 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4636                             const struct nlattr * const nla[])
4637 {
4638         struct netlink_ext_ack *extack = info->extack;
4639         u8 genmask = nft_genmask_next(info->net);
4640         u8 family = info->nfmsg->nfgen_family;
4641         struct net *net = info->net;
4642         const struct nlattr *attr;
4643         struct nft_table *table;
4644         struct nft_set *set;
4645         struct nft_ctx ctx;
4646
4647         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4648                 return -EAFNOSUPPORT;
4649
4650         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4651                                  genmask, NETLINK_CB(skb).portid);
4652         if (IS_ERR(table)) {
4653                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4654                 return PTR_ERR(table);
4655         }
4656
4657         if (nla[NFTA_SET_HANDLE]) {
4658                 attr = nla[NFTA_SET_HANDLE];
4659                 set = nft_set_lookup_byhandle(table, attr, genmask);
4660         } else {
4661                 attr = nla[NFTA_SET_NAME];
4662                 set = nft_set_lookup(table, attr, genmask);
4663         }
4664
4665         if (IS_ERR(set)) {
4666                 NL_SET_BAD_ATTR(extack, attr);
4667                 return PTR_ERR(set);
4668         }
4669         if (set->use ||
4670             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4671              atomic_read(&set->nelems) > 0)) {
4672                 NL_SET_BAD_ATTR(extack, attr);
4673                 return -EBUSY;
4674         }
4675
4676         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4677
4678         return nft_delset(&ctx, set);
4679 }
4680
4681 static int nft_validate_register_store(const struct nft_ctx *ctx,
4682                                        enum nft_registers reg,
4683                                        const struct nft_data *data,
4684                                        enum nft_data_types type,
4685                                        unsigned int len);
4686
4687 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4688                                      struct nft_set *set,
4689                                      struct nft_set_elem *elem)
4690 {
4691         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4692         enum nft_registers dreg;
4693
4694         dreg = nft_type_to_reg(set->dtype);
4695         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4696                                            set->dtype == NFT_DATA_VERDICT ?
4697                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4698                                            set->dlen);
4699 }
4700
4701 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4702                                         struct nft_set *set,
4703                                         const struct nft_set_iter *iter,
4704                                         struct nft_set_elem *elem)
4705 {
4706         return nft_setelem_data_validate(ctx, set, elem);
4707 }
4708
4709 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4710                                        struct nft_set *set)
4711 {
4712         u8 genmask = nft_genmask_next(ctx->net);
4713         struct nft_set_elem_catchall *catchall;
4714         struct nft_set_elem elem;
4715         struct nft_set_ext *ext;
4716         int ret = 0;
4717
4718         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4719                 ext = nft_set_elem_ext(set, catchall->elem);
4720                 if (!nft_set_elem_active(ext, genmask))
4721                         continue;
4722
4723                 elem.priv = catchall->elem;
4724                 ret = nft_setelem_data_validate(ctx, set, &elem);
4725                 if (ret < 0)
4726                         break;
4727         }
4728
4729         return ret;
4730 }
4731
4732 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4733                        struct nft_set_binding *binding)
4734 {
4735         struct nft_set_binding *i;
4736         struct nft_set_iter iter;
4737
4738         if (set->use == UINT_MAX)
4739                 return -EOVERFLOW;
4740
4741         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4742                 return -EBUSY;
4743
4744         if (binding->flags & NFT_SET_MAP) {
4745                 /* If the set is already bound to the same chain all
4746                  * jumps are already validated for that chain.
4747                  */
4748                 list_for_each_entry(i, &set->bindings, list) {
4749                         if (i->flags & NFT_SET_MAP &&
4750                             i->chain == binding->chain)
4751                                 goto bind;
4752                 }
4753
4754                 iter.genmask    = nft_genmask_next(ctx->net);
4755                 iter.skip       = 0;
4756                 iter.count      = 0;
4757                 iter.err        = 0;
4758                 iter.fn         = nf_tables_bind_check_setelem;
4759
4760                 set->ops->walk(ctx, set, &iter);
4761                 if (!iter.err)
4762                         iter.err = nft_set_catchall_bind_check(ctx, set);
4763
4764                 if (iter.err < 0)
4765                         return iter.err;
4766         }
4767 bind:
4768         binding->chain = ctx->chain;
4769         list_add_tail_rcu(&binding->list, &set->bindings);
4770         nft_set_trans_bind(ctx, set);
4771         set->use++;
4772
4773         return 0;
4774 }
4775 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4776
4777 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4778                                  struct nft_set_binding *binding, bool event)
4779 {
4780         list_del_rcu(&binding->list);
4781
4782         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4783                 list_del_rcu(&set->list);
4784                 if (event)
4785                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4786                                              GFP_KERNEL);
4787         }
4788 }
4789
4790 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4791                               struct nft_set_binding *binding,
4792                               enum nft_trans_phase phase)
4793 {
4794         switch (phase) {
4795         case NFT_TRANS_PREPARE:
4796                 set->use--;
4797                 return;
4798         case NFT_TRANS_ABORT:
4799         case NFT_TRANS_RELEASE:
4800                 set->use--;
4801                 fallthrough;
4802         default:
4803                 nf_tables_unbind_set(ctx, set, binding,
4804                                      phase == NFT_TRANS_COMMIT);
4805         }
4806 }
4807 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4808
4809 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4810 {
4811         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4812                 nft_set_destroy(ctx, set);
4813 }
4814 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4815
4816 const struct nft_set_ext_type nft_set_ext_types[] = {
4817         [NFT_SET_EXT_KEY]               = {
4818                 .align  = __alignof__(u32),
4819         },
4820         [NFT_SET_EXT_DATA]              = {
4821                 .align  = __alignof__(u32),
4822         },
4823         [NFT_SET_EXT_EXPRESSIONS]       = {
4824                 .align  = __alignof__(struct nft_set_elem_expr),
4825         },
4826         [NFT_SET_EXT_OBJREF]            = {
4827                 .len    = sizeof(struct nft_object *),
4828                 .align  = __alignof__(struct nft_object *),
4829         },
4830         [NFT_SET_EXT_FLAGS]             = {
4831                 .len    = sizeof(u8),
4832                 .align  = __alignof__(u8),
4833         },
4834         [NFT_SET_EXT_TIMEOUT]           = {
4835                 .len    = sizeof(u64),
4836                 .align  = __alignof__(u64),
4837         },
4838         [NFT_SET_EXT_EXPIRATION]        = {
4839                 .len    = sizeof(u64),
4840                 .align  = __alignof__(u64),
4841         },
4842         [NFT_SET_EXT_USERDATA]          = {
4843                 .len    = sizeof(struct nft_userdata),
4844                 .align  = __alignof__(struct nft_userdata),
4845         },
4846         [NFT_SET_EXT_KEY_END]           = {
4847                 .align  = __alignof__(u32),
4848         },
4849 };
4850
4851 /*
4852  * Set elements
4853  */
4854
4855 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4856         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4857         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4858         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4859         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4860         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4861         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4862                                             .len = NFT_USERDATA_MAXLEN },
4863         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4864         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4865                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4866         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4867         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4868 };
4869
4870 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4871         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4872                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4873         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4874                                             .len = NFT_SET_MAXNAMELEN - 1 },
4875         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4876         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4877 };
4878
4879 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4880                                   const struct nft_set *set,
4881                                   const struct nft_set_ext *ext)
4882 {
4883         struct nft_set_elem_expr *elem_expr;
4884         u32 size, num_exprs = 0;
4885         struct nft_expr *expr;
4886         struct nlattr *nest;
4887
4888         elem_expr = nft_set_ext_expr(ext);
4889         nft_setelem_expr_foreach(expr, elem_expr, size)
4890                 num_exprs++;
4891
4892         if (num_exprs == 1) {
4893                 expr = nft_setelem_expr_at(elem_expr, 0);
4894                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4895                         return -1;
4896
4897                 return 0;
4898         } else if (num_exprs > 1) {
4899                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4900                 if (nest == NULL)
4901                         goto nla_put_failure;
4902
4903                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4904                         expr = nft_setelem_expr_at(elem_expr, size);
4905                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4906                                 goto nla_put_failure;
4907                 }
4908                 nla_nest_end(skb, nest);
4909         }
4910         return 0;
4911
4912 nla_put_failure:
4913         return -1;
4914 }
4915
4916 static int nf_tables_fill_setelem(struct sk_buff *skb,
4917                                   const struct nft_set *set,
4918                                   const struct nft_set_elem *elem)
4919 {
4920         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4921         unsigned char *b = skb_tail_pointer(skb);
4922         struct nlattr *nest;
4923
4924         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4925         if (nest == NULL)
4926                 goto nla_put_failure;
4927
4928         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4929             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4930                           NFT_DATA_VALUE, set->klen) < 0)
4931                 goto nla_put_failure;
4932
4933         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4934             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4935                           NFT_DATA_VALUE, set->klen) < 0)
4936                 goto nla_put_failure;
4937
4938         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4939             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4940                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4941                           set->dlen) < 0)
4942                 goto nla_put_failure;
4943
4944         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4945             nft_set_elem_expr_dump(skb, set, ext))
4946                 goto nla_put_failure;
4947
4948         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4949             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4950                            (*nft_set_ext_obj(ext))->key.name) < 0)
4951                 goto nla_put_failure;
4952
4953         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4954             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4955                          htonl(*nft_set_ext_flags(ext))))
4956                 goto nla_put_failure;
4957
4958         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4959             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4960                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4961                          NFTA_SET_ELEM_PAD))
4962                 goto nla_put_failure;
4963
4964         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4965                 u64 expires, now = get_jiffies_64();
4966
4967                 expires = *nft_set_ext_expiration(ext);
4968                 if (time_before64(now, expires))
4969                         expires -= now;
4970                 else
4971                         expires = 0;
4972
4973                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4974                                  nf_jiffies64_to_msecs(expires),
4975                                  NFTA_SET_ELEM_PAD))
4976                         goto nla_put_failure;
4977         }
4978
4979         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4980                 struct nft_userdata *udata;
4981
4982                 udata = nft_set_ext_userdata(ext);
4983                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4984                             udata->len + 1, udata->data))
4985                         goto nla_put_failure;
4986         }
4987
4988         nla_nest_end(skb, nest);
4989         return 0;
4990
4991 nla_put_failure:
4992         nlmsg_trim(skb, b);
4993         return -EMSGSIZE;
4994 }
4995
4996 struct nft_set_dump_args {
4997         const struct netlink_callback   *cb;
4998         struct nft_set_iter             iter;
4999         struct sk_buff                  *skb;
5000 };
5001
5002 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5003                                   struct nft_set *set,
5004                                   const struct nft_set_iter *iter,
5005                                   struct nft_set_elem *elem)
5006 {
5007         struct nft_set_dump_args *args;
5008
5009         args = container_of(iter, struct nft_set_dump_args, iter);
5010         return nf_tables_fill_setelem(args->skb, set, elem);
5011 }
5012
5013 struct nft_set_dump_ctx {
5014         const struct nft_set    *set;
5015         struct nft_ctx          ctx;
5016 };
5017
5018 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5019                                  const struct nft_set *set)
5020 {
5021         struct nft_set_elem_catchall *catchall;
5022         u8 genmask = nft_genmask_cur(net);
5023         struct nft_set_elem elem;
5024         struct nft_set_ext *ext;
5025         int ret = 0;
5026
5027         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5028                 ext = nft_set_elem_ext(set, catchall->elem);
5029                 if (!nft_set_elem_active(ext, genmask) ||
5030                     nft_set_elem_expired(ext))
5031                         continue;
5032
5033                 elem.priv = catchall->elem;
5034                 ret = nf_tables_fill_setelem(skb, set, &elem);
5035                 break;
5036         }
5037
5038         return ret;
5039 }
5040
5041 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5042 {
5043         struct nft_set_dump_ctx *dump_ctx = cb->data;
5044         struct net *net = sock_net(skb->sk);
5045         struct nftables_pernet *nft_net;
5046         struct nft_table *table;
5047         struct nft_set *set;
5048         struct nft_set_dump_args args;
5049         bool set_found = false;
5050         struct nlmsghdr *nlh;
5051         struct nlattr *nest;
5052         u32 portid, seq;
5053         int event;
5054
5055         rcu_read_lock();
5056         nft_net = nft_pernet(net);
5057         cb->seq = READ_ONCE(nft_net->base_seq);
5058
5059         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5060                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5061                     dump_ctx->ctx.family != table->family)
5062                         continue;
5063
5064                 if (table != dump_ctx->ctx.table)
5065                         continue;
5066
5067                 list_for_each_entry_rcu(set, &table->sets, list) {
5068                         if (set == dump_ctx->set) {
5069                                 set_found = true;
5070                                 break;
5071                         }
5072                 }
5073                 break;
5074         }
5075
5076         if (!set_found) {
5077                 rcu_read_unlock();
5078                 return -ENOENT;
5079         }
5080
5081         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5082         portid = NETLINK_CB(cb->skb).portid;
5083         seq    = cb->nlh->nlmsg_seq;
5084
5085         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5086                            table->family, NFNETLINK_V0, nft_base_seq(net));
5087         if (!nlh)
5088                 goto nla_put_failure;
5089
5090         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5091                 goto nla_put_failure;
5092         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5093                 goto nla_put_failure;
5094
5095         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5096         if (nest == NULL)
5097                 goto nla_put_failure;
5098
5099         args.cb                 = cb;
5100         args.skb                = skb;
5101         args.iter.genmask       = nft_genmask_cur(net);
5102         args.iter.skip          = cb->args[0];
5103         args.iter.count         = 0;
5104         args.iter.err           = 0;
5105         args.iter.fn            = nf_tables_dump_setelem;
5106         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5107
5108         if (!args.iter.err && args.iter.count == cb->args[0])
5109                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5110         rcu_read_unlock();
5111
5112         nla_nest_end(skb, nest);
5113         nlmsg_end(skb, nlh);
5114
5115         if (args.iter.err && args.iter.err != -EMSGSIZE)
5116                 return args.iter.err;
5117         if (args.iter.count == cb->args[0])
5118                 return 0;
5119
5120         cb->args[0] = args.iter.count;
5121         return skb->len;
5122
5123 nla_put_failure:
5124         rcu_read_unlock();
5125         return -ENOSPC;
5126 }
5127
5128 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5129 {
5130         struct nft_set_dump_ctx *dump_ctx = cb->data;
5131
5132         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5133
5134         return cb->data ? 0 : -ENOMEM;
5135 }
5136
5137 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5138 {
5139         kfree(cb->data);
5140         return 0;
5141 }
5142
5143 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5144                                        const struct nft_ctx *ctx, u32 seq,
5145                                        u32 portid, int event, u16 flags,
5146                                        const struct nft_set *set,
5147                                        const struct nft_set_elem *elem)
5148 {
5149         struct nlmsghdr *nlh;
5150         struct nlattr *nest;
5151         int err;
5152
5153         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5154         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5155                            NFNETLINK_V0, nft_base_seq(ctx->net));
5156         if (!nlh)
5157                 goto nla_put_failure;
5158
5159         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5160                 goto nla_put_failure;
5161         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5162                 goto nla_put_failure;
5163
5164         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5165         if (nest == NULL)
5166                 goto nla_put_failure;
5167
5168         err = nf_tables_fill_setelem(skb, set, elem);
5169         if (err < 0)
5170                 goto nla_put_failure;
5171
5172         nla_nest_end(skb, nest);
5173
5174         nlmsg_end(skb, nlh);
5175         return 0;
5176
5177 nla_put_failure:
5178         nlmsg_trim(skb, nlh);
5179         return -1;
5180 }
5181
5182 static int nft_setelem_parse_flags(const struct nft_set *set,
5183                                    const struct nlattr *attr, u32 *flags)
5184 {
5185         if (attr == NULL)
5186                 return 0;
5187
5188         *flags = ntohl(nla_get_be32(attr));
5189         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5190                 return -EOPNOTSUPP;
5191         if (!(set->flags & NFT_SET_INTERVAL) &&
5192             *flags & NFT_SET_ELEM_INTERVAL_END)
5193                 return -EINVAL;
5194         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5195             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5196                 return -EINVAL;
5197
5198         return 0;
5199 }
5200
5201 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5202                                  struct nft_data *key, struct nlattr *attr)
5203 {
5204         struct nft_data_desc desc = {
5205                 .type   = NFT_DATA_VALUE,
5206                 .size   = NFT_DATA_VALUE_MAXLEN,
5207                 .len    = set->klen,
5208         };
5209
5210         return nft_data_init(ctx, key, &desc, attr);
5211 }
5212
5213 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5214                                   struct nft_data_desc *desc,
5215                                   struct nft_data *data,
5216                                   struct nlattr *attr)
5217 {
5218         u32 dtype;
5219
5220         if (set->dtype == NFT_DATA_VERDICT)
5221                 dtype = NFT_DATA_VERDICT;
5222         else
5223                 dtype = NFT_DATA_VALUE;
5224
5225         desc->type = dtype;
5226         desc->size = NFT_DATA_VALUE_MAXLEN;
5227         desc->len = set->dlen;
5228         desc->flags = NFT_DATA_DESC_SETELEM;
5229
5230         return nft_data_init(ctx, data, desc, attr);
5231 }
5232
5233 static void *nft_setelem_catchall_get(const struct net *net,
5234                                       const struct nft_set *set)
5235 {
5236         struct nft_set_elem_catchall *catchall;
5237         u8 genmask = nft_genmask_cur(net);
5238         struct nft_set_ext *ext;
5239         void *priv = NULL;
5240
5241         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5242                 ext = nft_set_elem_ext(set, catchall->elem);
5243                 if (!nft_set_elem_active(ext, genmask) ||
5244                     nft_set_elem_expired(ext))
5245                         continue;
5246
5247                 priv = catchall->elem;
5248                 break;
5249         }
5250
5251         return priv;
5252 }
5253
5254 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5255                            struct nft_set_elem *elem, u32 flags)
5256 {
5257         void *priv;
5258
5259         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5260                 priv = set->ops->get(ctx->net, set, elem, flags);
5261                 if (IS_ERR(priv))
5262                         return PTR_ERR(priv);
5263         } else {
5264                 priv = nft_setelem_catchall_get(ctx->net, set);
5265                 if (!priv)
5266                         return -ENOENT;
5267         }
5268         elem->priv = priv;
5269
5270         return 0;
5271 }
5272
5273 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5274                             const struct nlattr *attr)
5275 {
5276         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5277         struct nft_set_elem elem;
5278         struct sk_buff *skb;
5279         uint32_t flags = 0;
5280         int err;
5281
5282         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5283                                           nft_set_elem_policy, NULL);
5284         if (err < 0)
5285                 return err;
5286
5287         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5288         if (err < 0)
5289                 return err;
5290
5291         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5292                 return -EINVAL;
5293
5294         if (nla[NFTA_SET_ELEM_KEY]) {
5295                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5296                                             nla[NFTA_SET_ELEM_KEY]);
5297                 if (err < 0)
5298                         return err;
5299         }
5300
5301         if (nla[NFTA_SET_ELEM_KEY_END]) {
5302                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5303                                             nla[NFTA_SET_ELEM_KEY_END]);
5304                 if (err < 0)
5305                         return err;
5306         }
5307
5308         err = nft_setelem_get(ctx, set, &elem, flags);
5309         if (err < 0)
5310                 return err;
5311
5312         err = -ENOMEM;
5313         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5314         if (skb == NULL)
5315                 return err;
5316
5317         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5318                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5319         if (err < 0)
5320                 goto err_fill_setelem;
5321
5322         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5323
5324 err_fill_setelem:
5325         kfree_skb(skb);
5326         return err;
5327 }
5328
5329 /* called with rcu_read_lock held */
5330 static int nf_tables_getsetelem(struct sk_buff *skb,
5331                                 const struct nfnl_info *info,
5332                                 const struct nlattr * const nla[])
5333 {
5334         struct netlink_ext_ack *extack = info->extack;
5335         u8 genmask = nft_genmask_cur(info->net);
5336         u8 family = info->nfmsg->nfgen_family;
5337         struct net *net = info->net;
5338         struct nft_table *table;
5339         struct nft_set *set;
5340         struct nlattr *attr;
5341         struct nft_ctx ctx;
5342         int rem, err = 0;
5343
5344         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5345                                  genmask, NETLINK_CB(skb).portid);
5346         if (IS_ERR(table)) {
5347                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5348                 return PTR_ERR(table);
5349         }
5350
5351         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5352         if (IS_ERR(set))
5353                 return PTR_ERR(set);
5354
5355         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5356
5357         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5358                 struct netlink_dump_control c = {
5359                         .start = nf_tables_dump_set_start,
5360                         .dump = nf_tables_dump_set,
5361                         .done = nf_tables_dump_set_done,
5362                         .module = THIS_MODULE,
5363                 };
5364                 struct nft_set_dump_ctx dump_ctx = {
5365                         .set = set,
5366                         .ctx = ctx,
5367                 };
5368
5369                 c.data = &dump_ctx;
5370                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5371         }
5372
5373         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5374                 return -EINVAL;
5375
5376         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5377                 err = nft_get_set_elem(&ctx, set, attr);
5378                 if (err < 0)
5379                         break;
5380         }
5381
5382         return err;
5383 }
5384
5385 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5386                                      const struct nft_set *set,
5387                                      const struct nft_set_elem *elem,
5388                                      int event)
5389 {
5390         struct nftables_pernet *nft_net;
5391         struct net *net = ctx->net;
5392         u32 portid = ctx->portid;
5393         struct sk_buff *skb;
5394         u16 flags = 0;
5395         int err;
5396
5397         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5398                 return;
5399
5400         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5401         if (skb == NULL)
5402                 goto err;
5403
5404         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5405                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5406
5407         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5408                                           set, elem);
5409         if (err < 0) {
5410                 kfree_skb(skb);
5411                 goto err;
5412         }
5413
5414         nft_net = nft_pernet(net);
5415         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5416         return;
5417 err:
5418         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5419 }
5420
5421 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5422                                               int msg_type,
5423                                               struct nft_set *set)
5424 {
5425         struct nft_trans *trans;
5426
5427         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5428         if (trans == NULL)
5429                 return NULL;
5430
5431         nft_trans_elem_set(trans) = set;
5432         return trans;
5433 }
5434
5435 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5436                                          const struct nft_set *set,
5437                                          const struct nlattr *attr)
5438 {
5439         struct nft_expr *expr;
5440         int err;
5441
5442         expr = nft_expr_init(ctx, attr);
5443         if (IS_ERR(expr))
5444                 return expr;
5445
5446         err = -EOPNOTSUPP;
5447         if (expr->ops->type->flags & NFT_EXPR_GC) {
5448                 if (set->flags & NFT_SET_TIMEOUT)
5449                         goto err_set_elem_expr;
5450                 if (!set->ops->gc_init)
5451                         goto err_set_elem_expr;
5452                 set->ops->gc_init(set);
5453         }
5454
5455         return expr;
5456
5457 err_set_elem_expr:
5458         nft_expr_destroy(ctx, expr);
5459         return ERR_PTR(err);
5460 }
5461
5462 void *nft_set_elem_init(const struct nft_set *set,
5463                         const struct nft_set_ext_tmpl *tmpl,
5464                         const u32 *key, const u32 *key_end,
5465                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5466 {
5467         struct nft_set_ext *ext;
5468         void *elem;
5469
5470         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5471         if (elem == NULL)
5472                 return NULL;
5473
5474         ext = nft_set_elem_ext(set, elem);
5475         nft_set_ext_init(ext, tmpl);
5476
5477         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5478                 memcpy(nft_set_ext_key(ext), key, set->klen);
5479         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5480                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5481         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5482                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5483         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5484                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5485                 if (expiration == 0)
5486                         *nft_set_ext_expiration(ext) += timeout;
5487         }
5488         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5489                 *nft_set_ext_timeout(ext) = timeout;
5490
5491         return elem;
5492 }
5493
5494 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5495                                         struct nft_expr *expr)
5496 {
5497         if (expr->ops->destroy_clone) {
5498                 expr->ops->destroy_clone(ctx, expr);
5499                 module_put(expr->ops->type->owner);
5500         } else {
5501                 nf_tables_expr_destroy(ctx, expr);
5502         }
5503 }
5504
5505 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5506                                       struct nft_set_elem_expr *elem_expr)
5507 {
5508         struct nft_expr *expr;
5509         u32 size;
5510
5511         nft_setelem_expr_foreach(expr, elem_expr, size)
5512                 __nft_set_elem_expr_destroy(ctx, expr);
5513 }
5514
5515 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5516                           bool destroy_expr)
5517 {
5518         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5519         struct nft_ctx ctx = {
5520                 .net    = read_pnet(&set->net),
5521                 .family = set->table->family,
5522         };
5523
5524         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5525         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5526                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5527         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5528                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5529
5530         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5531                 (*nft_set_ext_obj(ext))->use--;
5532         kfree(elem);
5533 }
5534 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5535
5536 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5537  * with the refcounting from the preparation phase.
5538  */
5539 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5540                                        const struct nft_set *set, void *elem)
5541 {
5542         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5543
5544         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5545                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5546
5547         kfree(elem);
5548 }
5549
5550 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5551                             struct nft_expr *expr_array[])
5552 {
5553         struct nft_expr *expr;
5554         int err, i, k;
5555
5556         for (i = 0; i < set->num_exprs; i++) {
5557                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5558                 if (!expr)
5559                         goto err_expr;
5560
5561                 err = nft_expr_clone(expr, set->exprs[i]);
5562                 if (err < 0) {
5563                         kfree(expr);
5564                         goto err_expr;
5565                 }
5566                 expr_array[i] = expr;
5567         }
5568
5569         return 0;
5570
5571 err_expr:
5572         for (k = i - 1; k >= 0; k--)
5573                 nft_expr_destroy(ctx, expr_array[k]);
5574
5575         return -ENOMEM;
5576 }
5577
5578 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5579                                    const struct nft_set_ext *ext,
5580                                    struct nft_expr *expr_array[],
5581                                    u32 num_exprs)
5582 {
5583         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5584         struct nft_expr *expr;
5585         int i, err;
5586
5587         for (i = 0; i < num_exprs; i++) {
5588                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5589                 err = nft_expr_clone(expr, expr_array[i]);
5590                 if (err < 0)
5591                         goto err_elem_expr_setup;
5592
5593                 elem_expr->size += expr_array[i]->ops->size;
5594                 nft_expr_destroy(ctx, expr_array[i]);
5595                 expr_array[i] = NULL;
5596         }
5597
5598         return 0;
5599
5600 err_elem_expr_setup:
5601         for (; i < num_exprs; i++) {
5602                 nft_expr_destroy(ctx, expr_array[i]);
5603                 expr_array[i] = NULL;
5604         }
5605
5606         return -ENOMEM;
5607 }
5608
5609 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5610                                             const struct nft_set *set)
5611 {
5612         struct nft_set_elem_catchall *catchall;
5613         u8 genmask = nft_genmask_cur(net);
5614         struct nft_set_ext *ext;
5615
5616         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5617                 ext = nft_set_elem_ext(set, catchall->elem);
5618                 if (nft_set_elem_active(ext, genmask) &&
5619                     !nft_set_elem_expired(ext))
5620                         return ext;
5621         }
5622
5623         return NULL;
5624 }
5625 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5626
5627 void *nft_set_catchall_gc(const struct nft_set *set)
5628 {
5629         struct nft_set_elem_catchall *catchall, *next;
5630         struct nft_set_ext *ext;
5631         void *elem = NULL;
5632
5633         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5634                 ext = nft_set_elem_ext(set, catchall->elem);
5635
5636                 if (!nft_set_elem_expired(ext) ||
5637                     nft_set_elem_mark_busy(ext))
5638                         continue;
5639
5640                 elem = catchall->elem;
5641                 list_del_rcu(&catchall->list);
5642                 kfree_rcu(catchall, rcu);
5643                 break;
5644         }
5645
5646         return elem;
5647 }
5648 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5649
5650 static int nft_setelem_catchall_insert(const struct net *net,
5651                                        struct nft_set *set,
5652                                        const struct nft_set_elem *elem,
5653                                        struct nft_set_ext **pext)
5654 {
5655         struct nft_set_elem_catchall *catchall;
5656         u8 genmask = nft_genmask_next(net);
5657         struct nft_set_ext *ext;
5658
5659         list_for_each_entry(catchall, &set->catchall_list, list) {
5660                 ext = nft_set_elem_ext(set, catchall->elem);
5661                 if (nft_set_elem_active(ext, genmask)) {
5662                         *pext = ext;
5663                         return -EEXIST;
5664                 }
5665         }
5666
5667         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5668         if (!catchall)
5669                 return -ENOMEM;
5670
5671         catchall->elem = elem->priv;
5672         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5673
5674         return 0;
5675 }
5676
5677 static int nft_setelem_insert(const struct net *net,
5678                               struct nft_set *set,
5679                               const struct nft_set_elem *elem,
5680                               struct nft_set_ext **ext, unsigned int flags)
5681 {
5682         int ret;
5683
5684         if (flags & NFT_SET_ELEM_CATCHALL)
5685                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5686         else
5687                 ret = set->ops->insert(net, set, elem, ext);
5688
5689         return ret;
5690 }
5691
5692 static bool nft_setelem_is_catchall(const struct nft_set *set,
5693                                     const struct nft_set_elem *elem)
5694 {
5695         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5696
5697         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5698             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5699                 return true;
5700
5701         return false;
5702 }
5703
5704 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5705                                  struct nft_set_elem *elem)
5706 {
5707         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5708
5709         if (nft_setelem_is_catchall(set, elem)) {
5710                 nft_set_elem_change_active(net, set, ext);
5711                 nft_set_elem_clear_busy(ext);
5712         } else {
5713                 set->ops->activate(net, set, elem);
5714         }
5715 }
5716
5717 static int nft_setelem_catchall_deactivate(const struct net *net,
5718                                            struct nft_set *set,
5719                                            struct nft_set_elem *elem)
5720 {
5721         struct nft_set_elem_catchall *catchall;
5722         struct nft_set_ext *ext;
5723
5724         list_for_each_entry(catchall, &set->catchall_list, list) {
5725                 ext = nft_set_elem_ext(set, catchall->elem);
5726                 if (!nft_is_active(net, ext) ||
5727                     nft_set_elem_mark_busy(ext))
5728                         continue;
5729
5730                 kfree(elem->priv);
5731                 elem->priv = catchall->elem;
5732                 nft_set_elem_change_active(net, set, ext);
5733                 return 0;
5734         }
5735
5736         return -ENOENT;
5737 }
5738
5739 static int __nft_setelem_deactivate(const struct net *net,
5740                                     struct nft_set *set,
5741                                     struct nft_set_elem *elem)
5742 {
5743         void *priv;
5744
5745         priv = set->ops->deactivate(net, set, elem);
5746         if (!priv)
5747                 return -ENOENT;
5748
5749         kfree(elem->priv);
5750         elem->priv = priv;
5751         set->ndeact++;
5752
5753         return 0;
5754 }
5755
5756 static int nft_setelem_deactivate(const struct net *net,
5757                                   struct nft_set *set,
5758                                   struct nft_set_elem *elem, u32 flags)
5759 {
5760         int ret;
5761
5762         if (flags & NFT_SET_ELEM_CATCHALL)
5763                 ret = nft_setelem_catchall_deactivate(net, set, elem);
5764         else
5765                 ret = __nft_setelem_deactivate(net, set, elem);
5766
5767         return ret;
5768 }
5769
5770 static void nft_setelem_catchall_remove(const struct net *net,
5771                                         const struct nft_set *set,
5772                                         const struct nft_set_elem *elem)
5773 {
5774         struct nft_set_elem_catchall *catchall, *next;
5775
5776         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5777                 if (catchall->elem == elem->priv) {
5778                         list_del_rcu(&catchall->list);
5779                         kfree_rcu(catchall, rcu);
5780                         break;
5781                 }
5782         }
5783 }
5784
5785 static void nft_setelem_remove(const struct net *net,
5786                                const struct nft_set *set,
5787                                const struct nft_set_elem *elem)
5788 {
5789         if (nft_setelem_is_catchall(set, elem))
5790                 nft_setelem_catchall_remove(net, set, elem);
5791         else
5792                 set->ops->remove(net, set, elem);
5793 }
5794
5795 static bool nft_setelem_valid_key_end(const struct nft_set *set,
5796                                       struct nlattr **nla, u32 flags)
5797 {
5798         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
5799                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
5800                 if (flags & NFT_SET_ELEM_INTERVAL_END)
5801                         return false;
5802
5803                 if (nla[NFTA_SET_ELEM_KEY_END] &&
5804                     flags & NFT_SET_ELEM_CATCHALL)
5805                         return false;
5806         } else {
5807                 if (nla[NFTA_SET_ELEM_KEY_END])
5808                         return false;
5809         }
5810
5811         return true;
5812 }
5813
5814 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5815                             const struct nlattr *attr, u32 nlmsg_flags)
5816 {
5817         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5818         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5819         u8 genmask = nft_genmask_next(ctx->net);
5820         u32 flags = 0, size = 0, num_exprs = 0;
5821         struct nft_set_ext_tmpl tmpl;
5822         struct nft_set_ext *ext, *ext2;
5823         struct nft_set_elem elem;
5824         struct nft_set_binding *binding;
5825         struct nft_object *obj = NULL;
5826         struct nft_userdata *udata;
5827         struct nft_data_desc desc;
5828         enum nft_registers dreg;
5829         struct nft_trans *trans;
5830         u64 timeout;
5831         u64 expiration;
5832         int err, i;
5833         u8 ulen;
5834
5835         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5836                                           nft_set_elem_policy, NULL);
5837         if (err < 0)
5838                 return err;
5839
5840         nft_set_ext_prepare(&tmpl);
5841
5842         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5843         if (err < 0)
5844                 return err;
5845
5846         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5847                 return -EINVAL;
5848
5849         if (flags != 0) {
5850                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5851                 if (err < 0)
5852                         return err;
5853         }
5854
5855         if (set->flags & NFT_SET_MAP) {
5856                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5857                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5858                         return -EINVAL;
5859         } else {
5860                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5861                         return -EINVAL;
5862         }
5863
5864         if (set->flags & NFT_SET_OBJECT) {
5865                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
5866                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5867                         return -EINVAL;
5868         } else {
5869                 if (nla[NFTA_SET_ELEM_OBJREF])
5870                         return -EINVAL;
5871         }
5872
5873         if (!nft_setelem_valid_key_end(set, nla, flags))
5874                 return -EINVAL;
5875
5876         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5877              (nla[NFTA_SET_ELEM_DATA] ||
5878               nla[NFTA_SET_ELEM_OBJREF] ||
5879               nla[NFTA_SET_ELEM_TIMEOUT] ||
5880               nla[NFTA_SET_ELEM_EXPIRATION] ||
5881               nla[NFTA_SET_ELEM_USERDATA] ||
5882               nla[NFTA_SET_ELEM_EXPR] ||
5883               nla[NFTA_SET_ELEM_KEY_END] ||
5884               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5885                 return -EINVAL;
5886
5887         timeout = 0;
5888         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5889                 if (!(set->flags & NFT_SET_TIMEOUT))
5890                         return -EINVAL;
5891                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5892                                             &timeout);
5893                 if (err)
5894                         return err;
5895         } else if (set->flags & NFT_SET_TIMEOUT &&
5896                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
5897                 timeout = READ_ONCE(set->timeout);
5898         }
5899
5900         expiration = 0;
5901         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5902                 if (!(set->flags & NFT_SET_TIMEOUT))
5903                         return -EINVAL;
5904                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5905                                             &expiration);
5906                 if (err)
5907                         return err;
5908         }
5909
5910         if (nla[NFTA_SET_ELEM_EXPR]) {
5911                 struct nft_expr *expr;
5912
5913                 if (set->num_exprs && set->num_exprs != 1)
5914                         return -EOPNOTSUPP;
5915
5916                 expr = nft_set_elem_expr_alloc(ctx, set,
5917                                                nla[NFTA_SET_ELEM_EXPR]);
5918                 if (IS_ERR(expr))
5919                         return PTR_ERR(expr);
5920
5921                 expr_array[0] = expr;
5922                 num_exprs = 1;
5923
5924                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5925                         err = -EOPNOTSUPP;
5926                         goto err_set_elem_expr;
5927                 }
5928         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5929                 struct nft_expr *expr;
5930                 struct nlattr *tmp;
5931                 int left;
5932
5933                 i = 0;
5934                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5935                         if (i == NFT_SET_EXPR_MAX ||
5936                             (set->num_exprs && set->num_exprs == i)) {
5937                                 err = -E2BIG;
5938                                 goto err_set_elem_expr;
5939                         }
5940                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
5941                                 err = -EINVAL;
5942                                 goto err_set_elem_expr;
5943                         }
5944                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5945                         if (IS_ERR(expr)) {
5946                                 err = PTR_ERR(expr);
5947                                 goto err_set_elem_expr;
5948                         }
5949                         expr_array[i] = expr;
5950                         num_exprs++;
5951
5952                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5953                                 err = -EOPNOTSUPP;
5954                                 goto err_set_elem_expr;
5955                         }
5956                         i++;
5957                 }
5958                 if (set->num_exprs && set->num_exprs != i) {
5959                         err = -EOPNOTSUPP;
5960                         goto err_set_elem_expr;
5961                 }
5962         } else if (set->num_exprs > 0 &&
5963                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
5964                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5965                 if (err < 0)
5966                         goto err_set_elem_expr_clone;
5967
5968                 num_exprs = set->num_exprs;
5969         }
5970
5971         if (nla[NFTA_SET_ELEM_KEY]) {
5972                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5973                                             nla[NFTA_SET_ELEM_KEY]);
5974                 if (err < 0)
5975                         goto err_set_elem_expr;
5976
5977                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5978                 if (err < 0)
5979                         goto err_parse_key;
5980         }
5981
5982         if (nla[NFTA_SET_ELEM_KEY_END]) {
5983                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5984                                             nla[NFTA_SET_ELEM_KEY_END]);
5985                 if (err < 0)
5986                         goto err_parse_key;
5987
5988                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5989                 if (err < 0)
5990                         goto err_parse_key_end;
5991         }
5992
5993         if (timeout > 0) {
5994                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5995                 if (err < 0)
5996                         goto err_parse_key_end;
5997
5998                 if (timeout != READ_ONCE(set->timeout)) {
5999                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6000                         if (err < 0)
6001                                 goto err_parse_key_end;
6002                 }
6003         }
6004
6005         if (num_exprs) {
6006                 for (i = 0; i < num_exprs; i++)
6007                         size += expr_array[i]->ops->size;
6008
6009                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6010                                              sizeof(struct nft_set_elem_expr) + size);
6011                 if (err < 0)
6012                         goto err_parse_key_end;
6013         }
6014
6015         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6016                 obj = nft_obj_lookup(ctx->net, ctx->table,
6017                                      nla[NFTA_SET_ELEM_OBJREF],
6018                                      set->objtype, genmask);
6019                 if (IS_ERR(obj)) {
6020                         err = PTR_ERR(obj);
6021                         goto err_parse_key_end;
6022                 }
6023                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6024                 if (err < 0)
6025                         goto err_parse_key_end;
6026         }
6027
6028         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6029                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6030                                              nla[NFTA_SET_ELEM_DATA]);
6031                 if (err < 0)
6032                         goto err_parse_key_end;
6033
6034                 dreg = nft_type_to_reg(set->dtype);
6035                 list_for_each_entry(binding, &set->bindings, list) {
6036                         struct nft_ctx bind_ctx = {
6037                                 .net    = ctx->net,
6038                                 .family = ctx->family,
6039                                 .table  = ctx->table,
6040                                 .chain  = (struct nft_chain *)binding->chain,
6041                         };
6042
6043                         if (!(binding->flags & NFT_SET_MAP))
6044                                 continue;
6045
6046                         err = nft_validate_register_store(&bind_ctx, dreg,
6047                                                           &elem.data.val,
6048                                                           desc.type, desc.len);
6049                         if (err < 0)
6050                                 goto err_parse_data;
6051
6052                         if (desc.type == NFT_DATA_VERDICT &&
6053                             (elem.data.val.verdict.code == NFT_GOTO ||
6054                              elem.data.val.verdict.code == NFT_JUMP))
6055                                 nft_validate_state_update(ctx->net,
6056                                                           NFT_VALIDATE_NEED);
6057                 }
6058
6059                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6060                 if (err < 0)
6061                         goto err_parse_data;
6062         }
6063
6064         /* The full maximum length of userdata can exceed the maximum
6065          * offset value (U8_MAX) for following extensions, therefor it
6066          * must be the last extension added.
6067          */
6068         ulen = 0;
6069         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6070                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6071                 if (ulen > 0) {
6072                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6073                                                      ulen);
6074                         if (err < 0)
6075                                 goto err_parse_data;
6076                 }
6077         }
6078
6079         err = -ENOMEM;
6080         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6081                                       elem.key_end.val.data, elem.data.val.data,
6082                                       timeout, expiration, GFP_KERNEL);
6083         if (elem.priv == NULL)
6084                 goto err_parse_data;
6085
6086         ext = nft_set_elem_ext(set, elem.priv);
6087         if (flags)
6088                 *nft_set_ext_flags(ext) = flags;
6089         if (ulen > 0) {
6090                 udata = nft_set_ext_userdata(ext);
6091                 udata->len = ulen - 1;
6092                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6093         }
6094         if (obj) {
6095                 *nft_set_ext_obj(ext) = obj;
6096                 obj->use++;
6097         }
6098         err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
6099         if (err < 0)
6100                 goto err_elem_expr;
6101
6102         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6103         if (trans == NULL) {
6104                 err = -ENOMEM;
6105                 goto err_elem_expr;
6106         }
6107
6108         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6109
6110         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6111         if (err) {
6112                 if (err == -EEXIST) {
6113                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6114                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6115                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6116                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6117                                 goto err_element_clash;
6118                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6119                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6120                              memcmp(nft_set_ext_data(ext),
6121                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6122                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6123                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6124                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6125                                 goto err_element_clash;
6126                         else if (!(nlmsg_flags & NLM_F_EXCL))
6127                                 err = 0;
6128                 } else if (err == -ENOTEMPTY) {
6129                         /* ENOTEMPTY reports overlapping between this element
6130                          * and an existing one.
6131                          */
6132                         err = -EEXIST;
6133                 }
6134                 goto err_element_clash;
6135         }
6136
6137         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6138             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6139                 err = -ENFILE;
6140                 goto err_set_full;
6141         }
6142
6143         nft_trans_elem(trans) = elem;
6144         nft_trans_commit_list_add_tail(ctx->net, trans);
6145         return 0;
6146
6147 err_set_full:
6148         nft_setelem_remove(ctx->net, set, &elem);
6149 err_element_clash:
6150         kfree(trans);
6151 err_elem_expr:
6152         if (obj)
6153                 obj->use--;
6154
6155         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6156 err_parse_data:
6157         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6158                 nft_data_release(&elem.data.val, desc.type);
6159 err_parse_key_end:
6160         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6161 err_parse_key:
6162         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6163 err_set_elem_expr:
6164         for (i = 0; i < num_exprs && expr_array[i]; i++)
6165                 nft_expr_destroy(ctx, expr_array[i]);
6166 err_set_elem_expr_clone:
6167         return err;
6168 }
6169
6170 static int nf_tables_newsetelem(struct sk_buff *skb,
6171                                 const struct nfnl_info *info,
6172                                 const struct nlattr * const nla[])
6173 {
6174         struct nftables_pernet *nft_net = nft_pernet(info->net);
6175         struct netlink_ext_ack *extack = info->extack;
6176         u8 genmask = nft_genmask_next(info->net);
6177         u8 family = info->nfmsg->nfgen_family;
6178         struct net *net = info->net;
6179         const struct nlattr *attr;
6180         struct nft_table *table;
6181         struct nft_set *set;
6182         struct nft_ctx ctx;
6183         int rem, err;
6184
6185         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6186                 return -EINVAL;
6187
6188         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6189                                  genmask, NETLINK_CB(skb).portid);
6190         if (IS_ERR(table)) {
6191                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6192                 return PTR_ERR(table);
6193         }
6194
6195         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6196                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6197         if (IS_ERR(set))
6198                 return PTR_ERR(set);
6199
6200         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6201                 return -EBUSY;
6202
6203         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6204
6205         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6206                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6207                 if (err < 0)
6208                         return err;
6209         }
6210
6211         if (nft_net->validate_state == NFT_VALIDATE_DO)
6212                 return nft_table_validate(net, table);
6213
6214         return 0;
6215 }
6216
6217 /**
6218  *      nft_data_hold - hold a nft_data item
6219  *
6220  *      @data: struct nft_data to release
6221  *      @type: type of data
6222  *
6223  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6224  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6225  *      NFT_GOTO verdicts. This function must be called on active data objects
6226  *      from the second phase of the commit protocol.
6227  */
6228 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6229 {
6230         struct nft_chain *chain;
6231         struct nft_rule *rule;
6232
6233         if (type == NFT_DATA_VERDICT) {
6234                 switch (data->verdict.code) {
6235                 case NFT_JUMP:
6236                 case NFT_GOTO:
6237                         chain = data->verdict.chain;
6238                         chain->use++;
6239
6240                         if (!nft_chain_is_bound(chain))
6241                                 break;
6242
6243                         chain->table->use++;
6244                         list_for_each_entry(rule, &chain->rules, list)
6245                                 chain->use++;
6246
6247                         nft_chain_add(chain->table, chain);
6248                         break;
6249                 }
6250         }
6251 }
6252
6253 static void nft_setelem_data_activate(const struct net *net,
6254                                       const struct nft_set *set,
6255                                       struct nft_set_elem *elem)
6256 {
6257         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6258
6259         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6260                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6261         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6262                 (*nft_set_ext_obj(ext))->use++;
6263 }
6264
6265 static void nft_setelem_data_deactivate(const struct net *net,
6266                                         const struct nft_set *set,
6267                                         struct nft_set_elem *elem)
6268 {
6269         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6270
6271         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6272                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6273         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6274                 (*nft_set_ext_obj(ext))->use--;
6275 }
6276
6277 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6278                            const struct nlattr *attr)
6279 {
6280         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6281         struct nft_set_ext_tmpl tmpl;
6282         struct nft_set_elem elem;
6283         struct nft_set_ext *ext;
6284         struct nft_trans *trans;
6285         u32 flags = 0;
6286         int err;
6287
6288         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6289                                           nft_set_elem_policy, NULL);
6290         if (err < 0)
6291                 return err;
6292
6293         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6294         if (err < 0)
6295                 return err;
6296
6297         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6298                 return -EINVAL;
6299
6300         if (!nft_setelem_valid_key_end(set, nla, flags))
6301                 return -EINVAL;
6302
6303         nft_set_ext_prepare(&tmpl);
6304
6305         if (flags != 0) {
6306                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6307                 if (err < 0)
6308                         return err;
6309         }
6310
6311         if (nla[NFTA_SET_ELEM_KEY]) {
6312                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6313                                             nla[NFTA_SET_ELEM_KEY]);
6314                 if (err < 0)
6315                         return err;
6316
6317                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6318                 if (err < 0)
6319                         goto fail_elem;
6320         }
6321
6322         if (nla[NFTA_SET_ELEM_KEY_END]) {
6323                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6324                                             nla[NFTA_SET_ELEM_KEY_END]);
6325                 if (err < 0)
6326                         goto fail_elem;
6327
6328                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6329                 if (err < 0)
6330                         goto fail_elem_key_end;
6331         }
6332
6333         err = -ENOMEM;
6334         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6335                                       elem.key_end.val.data, NULL, 0, 0,
6336                                       GFP_KERNEL);
6337         if (elem.priv == NULL)
6338                 goto fail_elem_key_end;
6339
6340         ext = nft_set_elem_ext(set, elem.priv);
6341         if (flags)
6342                 *nft_set_ext_flags(ext) = flags;
6343
6344         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6345         if (trans == NULL)
6346                 goto fail_trans;
6347
6348         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6349         if (err < 0)
6350                 goto fail_ops;
6351
6352         nft_setelem_data_deactivate(ctx->net, set, &elem);
6353
6354         nft_trans_elem(trans) = elem;
6355         nft_trans_commit_list_add_tail(ctx->net, trans);
6356         return 0;
6357
6358 fail_ops:
6359         kfree(trans);
6360 fail_trans:
6361         kfree(elem.priv);
6362 fail_elem_key_end:
6363         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6364 fail_elem:
6365         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6366         return err;
6367 }
6368
6369 static int nft_setelem_flush(const struct nft_ctx *ctx,
6370                              struct nft_set *set,
6371                              const struct nft_set_iter *iter,
6372                              struct nft_set_elem *elem)
6373 {
6374         struct nft_trans *trans;
6375         int err;
6376
6377         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6378                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6379         if (!trans)
6380                 return -ENOMEM;
6381
6382         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6383                 err = -ENOENT;
6384                 goto err1;
6385         }
6386         set->ndeact++;
6387
6388         nft_setelem_data_deactivate(ctx->net, set, elem);
6389         nft_trans_elem_set(trans) = set;
6390         nft_trans_elem(trans) = *elem;
6391         nft_trans_commit_list_add_tail(ctx->net, trans);
6392
6393         return 0;
6394 err1:
6395         kfree(trans);
6396         return err;
6397 }
6398
6399 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6400                                     struct nft_set *set,
6401                                     struct nft_set_elem *elem)
6402 {
6403         struct nft_trans *trans;
6404
6405         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6406                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6407         if (!trans)
6408                 return -ENOMEM;
6409
6410         nft_setelem_data_deactivate(ctx->net, set, elem);
6411         nft_trans_elem_set(trans) = set;
6412         nft_trans_elem(trans) = *elem;
6413         nft_trans_commit_list_add_tail(ctx->net, trans);
6414
6415         return 0;
6416 }
6417
6418 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6419                                   struct nft_set *set)
6420 {
6421         u8 genmask = nft_genmask_next(ctx->net);
6422         struct nft_set_elem_catchall *catchall;
6423         struct nft_set_elem elem;
6424         struct nft_set_ext *ext;
6425         int ret = 0;
6426
6427         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6428                 ext = nft_set_elem_ext(set, catchall->elem);
6429                 if (!nft_set_elem_active(ext, genmask) ||
6430                     nft_set_elem_mark_busy(ext))
6431                         continue;
6432
6433                 elem.priv = catchall->elem;
6434                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6435                 if (ret < 0)
6436                         break;
6437         }
6438
6439         return ret;
6440 }
6441
6442 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6443 {
6444         struct nft_set_iter iter = {
6445                 .genmask        = genmask,
6446                 .fn             = nft_setelem_flush,
6447         };
6448
6449         set->ops->walk(ctx, set, &iter);
6450         if (!iter.err)
6451                 iter.err = nft_set_catchall_flush(ctx, set);
6452
6453         return iter.err;
6454 }
6455
6456 static int nf_tables_delsetelem(struct sk_buff *skb,
6457                                 const struct nfnl_info *info,
6458                                 const struct nlattr * const nla[])
6459 {
6460         struct netlink_ext_ack *extack = info->extack;
6461         u8 genmask = nft_genmask_next(info->net);
6462         u8 family = info->nfmsg->nfgen_family;
6463         struct net *net = info->net;
6464         const struct nlattr *attr;
6465         struct nft_table *table;
6466         struct nft_set *set;
6467         struct nft_ctx ctx;
6468         int rem, err = 0;
6469
6470         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6471                                  genmask, NETLINK_CB(skb).portid);
6472         if (IS_ERR(table)) {
6473                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6474                 return PTR_ERR(table);
6475         }
6476
6477         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6478         if (IS_ERR(set))
6479                 return PTR_ERR(set);
6480         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6481                 return -EBUSY;
6482
6483         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6484
6485         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6486                 return nft_set_flush(&ctx, set, genmask);
6487
6488         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6489                 err = nft_del_setelem(&ctx, set, attr);
6490                 if (err < 0)
6491                         break;
6492         }
6493         return err;
6494 }
6495
6496 void nft_set_gc_batch_release(struct rcu_head *rcu)
6497 {
6498         struct nft_set_gc_batch *gcb;
6499         unsigned int i;
6500
6501         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6502         for (i = 0; i < gcb->head.cnt; i++)
6503                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6504         kfree(gcb);
6505 }
6506
6507 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6508                                                 gfp_t gfp)
6509 {
6510         struct nft_set_gc_batch *gcb;
6511
6512         gcb = kzalloc(sizeof(*gcb), gfp);
6513         if (gcb == NULL)
6514                 return gcb;
6515         gcb->head.set = set;
6516         return gcb;
6517 }
6518
6519 /*
6520  * Stateful objects
6521  */
6522
6523 /**
6524  *      nft_register_obj- register nf_tables stateful object type
6525  *      @obj_type: object type
6526  *
6527  *      Registers the object type for use with nf_tables. Returns zero on
6528  *      success or a negative errno code otherwise.
6529  */
6530 int nft_register_obj(struct nft_object_type *obj_type)
6531 {
6532         if (obj_type->type == NFT_OBJECT_UNSPEC)
6533                 return -EINVAL;
6534
6535         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6536         list_add_rcu(&obj_type->list, &nf_tables_objects);
6537         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6538         return 0;
6539 }
6540 EXPORT_SYMBOL_GPL(nft_register_obj);
6541
6542 /**
6543  *      nft_unregister_obj - unregister nf_tables object type
6544  *      @obj_type: object type
6545  *
6546  *      Unregisters the object type for use with nf_tables.
6547  */
6548 void nft_unregister_obj(struct nft_object_type *obj_type)
6549 {
6550         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6551         list_del_rcu(&obj_type->list);
6552         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6553 }
6554 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6555
6556 struct nft_object *nft_obj_lookup(const struct net *net,
6557                                   const struct nft_table *table,
6558                                   const struct nlattr *nla, u32 objtype,
6559                                   u8 genmask)
6560 {
6561         struct nft_object_hash_key k = { .table = table };
6562         char search[NFT_OBJ_MAXNAMELEN];
6563         struct rhlist_head *tmp, *list;
6564         struct nft_object *obj;
6565
6566         nla_strscpy(search, nla, sizeof(search));
6567         k.name = search;
6568
6569         WARN_ON_ONCE(!rcu_read_lock_held() &&
6570                      !lockdep_commit_lock_is_held(net));
6571
6572         rcu_read_lock();
6573         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6574         if (!list)
6575                 goto out;
6576
6577         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6578                 if (objtype == obj->ops->type->type &&
6579                     nft_active_genmask(obj, genmask)) {
6580                         rcu_read_unlock();
6581                         return obj;
6582                 }
6583         }
6584 out:
6585         rcu_read_unlock();
6586         return ERR_PTR(-ENOENT);
6587 }
6588 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6589
6590 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6591                                                   const struct nlattr *nla,
6592                                                   u32 objtype, u8 genmask)
6593 {
6594         struct nft_object *obj;
6595
6596         list_for_each_entry(obj, &table->objects, list) {
6597                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6598                     objtype == obj->ops->type->type &&
6599                     nft_active_genmask(obj, genmask))
6600                         return obj;
6601         }
6602         return ERR_PTR(-ENOENT);
6603 }
6604
6605 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6606         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6607                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6608         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6609                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6610         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6611         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6612         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6613         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6614                                     .len = NFT_USERDATA_MAXLEN },
6615 };
6616
6617 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6618                                        const struct nft_object_type *type,
6619                                        const struct nlattr *attr)
6620 {
6621         struct nlattr **tb;
6622         const struct nft_object_ops *ops;
6623         struct nft_object *obj;
6624         int err = -ENOMEM;
6625
6626         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6627         if (!tb)
6628                 goto err1;
6629
6630         if (attr) {
6631                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6632                                                   type->policy, NULL);
6633                 if (err < 0)
6634                         goto err2;
6635         } else {
6636                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6637         }
6638
6639         if (type->select_ops) {
6640                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6641                 if (IS_ERR(ops)) {
6642                         err = PTR_ERR(ops);
6643                         goto err2;
6644                 }
6645         } else {
6646                 ops = type->ops;
6647         }
6648
6649         err = -ENOMEM;
6650         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6651         if (!obj)
6652                 goto err2;
6653
6654         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6655         if (err < 0)
6656                 goto err3;
6657
6658         obj->ops = ops;
6659
6660         kfree(tb);
6661         return obj;
6662 err3:
6663         kfree(obj);
6664 err2:
6665         kfree(tb);
6666 err1:
6667         return ERR_PTR(err);
6668 }
6669
6670 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6671                            struct nft_object *obj, bool reset)
6672 {
6673         struct nlattr *nest;
6674
6675         nest = nla_nest_start_noflag(skb, attr);
6676         if (!nest)
6677                 goto nla_put_failure;
6678         if (obj->ops->dump(skb, obj, reset) < 0)
6679                 goto nla_put_failure;
6680         nla_nest_end(skb, nest);
6681         return 0;
6682
6683 nla_put_failure:
6684         return -1;
6685 }
6686
6687 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6688 {
6689         const struct nft_object_type *type;
6690
6691         list_for_each_entry(type, &nf_tables_objects, list) {
6692                 if (objtype == type->type)
6693                         return type;
6694         }
6695         return NULL;
6696 }
6697
6698 static const struct nft_object_type *
6699 nft_obj_type_get(struct net *net, u32 objtype)
6700 {
6701         const struct nft_object_type *type;
6702
6703         type = __nft_obj_type_get(objtype);
6704         if (type != NULL && try_module_get(type->owner))
6705                 return type;
6706
6707         lockdep_nfnl_nft_mutex_not_held();
6708 #ifdef CONFIG_MODULES
6709         if (type == NULL) {
6710                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6711                         return ERR_PTR(-EAGAIN);
6712         }
6713 #endif
6714         return ERR_PTR(-ENOENT);
6715 }
6716
6717 static int nf_tables_updobj(const struct nft_ctx *ctx,
6718                             const struct nft_object_type *type,
6719                             const struct nlattr *attr,
6720                             struct nft_object *obj)
6721 {
6722         struct nft_object *newobj;
6723         struct nft_trans *trans;
6724         int err = -ENOMEM;
6725
6726         if (!try_module_get(type->owner))
6727                 return -ENOENT;
6728
6729         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6730                                 sizeof(struct nft_trans_obj));
6731         if (!trans)
6732                 goto err_trans;
6733
6734         newobj = nft_obj_init(ctx, type, attr);
6735         if (IS_ERR(newobj)) {
6736                 err = PTR_ERR(newobj);
6737                 goto err_free_trans;
6738         }
6739
6740         nft_trans_obj(trans) = obj;
6741         nft_trans_obj_update(trans) = true;
6742         nft_trans_obj_newobj(trans) = newobj;
6743         nft_trans_commit_list_add_tail(ctx->net, trans);
6744
6745         return 0;
6746
6747 err_free_trans:
6748         kfree(trans);
6749 err_trans:
6750         module_put(type->owner);
6751         return err;
6752 }
6753
6754 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6755                             const struct nlattr * const nla[])
6756 {
6757         struct netlink_ext_ack *extack = info->extack;
6758         u8 genmask = nft_genmask_next(info->net);
6759         u8 family = info->nfmsg->nfgen_family;
6760         const struct nft_object_type *type;
6761         struct net *net = info->net;
6762         struct nft_table *table;
6763         struct nft_object *obj;
6764         struct nft_ctx ctx;
6765         u32 objtype;
6766         int err;
6767
6768         if (!nla[NFTA_OBJ_TYPE] ||
6769             !nla[NFTA_OBJ_NAME] ||
6770             !nla[NFTA_OBJ_DATA])
6771                 return -EINVAL;
6772
6773         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6774                                  NETLINK_CB(skb).portid);
6775         if (IS_ERR(table)) {
6776                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6777                 return PTR_ERR(table);
6778         }
6779
6780         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6781         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6782         if (IS_ERR(obj)) {
6783                 err = PTR_ERR(obj);
6784                 if (err != -ENOENT) {
6785                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6786                         return err;
6787                 }
6788         } else {
6789                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6790                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6791                         return -EEXIST;
6792                 }
6793                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6794                         return -EOPNOTSUPP;
6795
6796                 type = __nft_obj_type_get(objtype);
6797                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6798
6799                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6800         }
6801
6802         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6803
6804         type = nft_obj_type_get(net, objtype);
6805         if (IS_ERR(type))
6806                 return PTR_ERR(type);
6807
6808         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6809         if (IS_ERR(obj)) {
6810                 err = PTR_ERR(obj);
6811                 goto err_init;
6812         }
6813         obj->key.table = table;
6814         obj->handle = nf_tables_alloc_handle(table);
6815
6816         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6817         if (!obj->key.name) {
6818                 err = -ENOMEM;
6819                 goto err_strdup;
6820         }
6821
6822         if (nla[NFTA_OBJ_USERDATA]) {
6823                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6824                 if (obj->udata == NULL)
6825                         goto err_userdata;
6826
6827                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6828         }
6829
6830         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6831         if (err < 0)
6832                 goto err_trans;
6833
6834         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6835                               nft_objname_ht_params);
6836         if (err < 0)
6837                 goto err_obj_ht;
6838
6839         list_add_tail_rcu(&obj->list, &table->objects);
6840         table->use++;
6841         return 0;
6842 err_obj_ht:
6843         /* queued in transaction log */
6844         INIT_LIST_HEAD(&obj->list);
6845         return err;
6846 err_trans:
6847         kfree(obj->udata);
6848 err_userdata:
6849         kfree(obj->key.name);
6850 err_strdup:
6851         if (obj->ops->destroy)
6852                 obj->ops->destroy(&ctx, obj);
6853         kfree(obj);
6854 err_init:
6855         module_put(type->owner);
6856         return err;
6857 }
6858
6859 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6860                                    u32 portid, u32 seq, int event, u32 flags,
6861                                    int family, const struct nft_table *table,
6862                                    struct nft_object *obj, bool reset)
6863 {
6864         struct nlmsghdr *nlh;
6865
6866         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6867         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6868                            NFNETLINK_V0, nft_base_seq(net));
6869         if (!nlh)
6870                 goto nla_put_failure;
6871
6872         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6873             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6874             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6875             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6876             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6877             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6878                          NFTA_OBJ_PAD))
6879                 goto nla_put_failure;
6880
6881         if (obj->udata &&
6882             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6883                 goto nla_put_failure;
6884
6885         nlmsg_end(skb, nlh);
6886         return 0;
6887
6888 nla_put_failure:
6889         nlmsg_trim(skb, nlh);
6890         return -1;
6891 }
6892
6893 struct nft_obj_filter {
6894         char            *table;
6895         u32             type;
6896 };
6897
6898 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6899 {
6900         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6901         const struct nft_table *table;
6902         unsigned int idx = 0, s_idx = cb->args[0];
6903         struct nft_obj_filter *filter = cb->data;
6904         struct net *net = sock_net(skb->sk);
6905         int family = nfmsg->nfgen_family;
6906         struct nftables_pernet *nft_net;
6907         struct nft_object *obj;
6908         bool reset = false;
6909
6910         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6911                 reset = true;
6912
6913         rcu_read_lock();
6914         nft_net = nft_pernet(net);
6915         cb->seq = READ_ONCE(nft_net->base_seq);
6916
6917         list_for_each_entry_rcu(table, &nft_net->tables, list) {
6918                 if (family != NFPROTO_UNSPEC && family != table->family)
6919                         continue;
6920
6921                 list_for_each_entry_rcu(obj, &table->objects, list) {
6922                         if (!nft_is_active(net, obj))
6923                                 goto cont;
6924                         if (idx < s_idx)
6925                                 goto cont;
6926                         if (idx > s_idx)
6927                                 memset(&cb->args[1], 0,
6928                                        sizeof(cb->args) - sizeof(cb->args[0]));
6929                         if (filter && filter->table &&
6930                             strcmp(filter->table, table->name))
6931                                 goto cont;
6932                         if (filter &&
6933                             filter->type != NFT_OBJECT_UNSPEC &&
6934                             obj->ops->type->type != filter->type)
6935                                 goto cont;
6936                         if (reset) {
6937                                 char *buf = kasprintf(GFP_ATOMIC,
6938                                                       "%s:%u",
6939                                                       table->name,
6940                                                       nft_net->base_seq);
6941
6942                                 audit_log_nfcfg(buf,
6943                                                 family,
6944                                                 obj->handle,
6945                                                 AUDIT_NFT_OP_OBJ_RESET,
6946                                                 GFP_ATOMIC);
6947                                 kfree(buf);
6948                         }
6949
6950                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6951                                                     cb->nlh->nlmsg_seq,
6952                                                     NFT_MSG_NEWOBJ,
6953                                                     NLM_F_MULTI | NLM_F_APPEND,
6954                                                     table->family, table,
6955                                                     obj, reset) < 0)
6956                                 goto done;
6957
6958                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6959 cont:
6960                         idx++;
6961                 }
6962         }
6963 done:
6964         rcu_read_unlock();
6965
6966         cb->args[0] = idx;
6967         return skb->len;
6968 }
6969
6970 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6971 {
6972         const struct nlattr * const *nla = cb->data;
6973         struct nft_obj_filter *filter = NULL;
6974
6975         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6976                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6977                 if (!filter)
6978                         return -ENOMEM;
6979
6980                 if (nla[NFTA_OBJ_TABLE]) {
6981                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6982                         if (!filter->table) {
6983                                 kfree(filter);
6984                                 return -ENOMEM;
6985                         }
6986                 }
6987
6988                 if (nla[NFTA_OBJ_TYPE])
6989                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6990         }
6991
6992         cb->data = filter;
6993         return 0;
6994 }
6995
6996 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6997 {
6998         struct nft_obj_filter *filter = cb->data;
6999
7000         if (filter) {
7001                 kfree(filter->table);
7002                 kfree(filter);
7003         }
7004
7005         return 0;
7006 }
7007
7008 /* called with rcu_read_lock held */
7009 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7010                             const struct nlattr * const nla[])
7011 {
7012         struct netlink_ext_ack *extack = info->extack;
7013         u8 genmask = nft_genmask_cur(info->net);
7014         u8 family = info->nfmsg->nfgen_family;
7015         const struct nft_table *table;
7016         struct net *net = info->net;
7017         struct nft_object *obj;
7018         struct sk_buff *skb2;
7019         bool reset = false;
7020         u32 objtype;
7021         int err;
7022
7023         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7024                 struct netlink_dump_control c = {
7025                         .start = nf_tables_dump_obj_start,
7026                         .dump = nf_tables_dump_obj,
7027                         .done = nf_tables_dump_obj_done,
7028                         .module = THIS_MODULE,
7029                         .data = (void *)nla,
7030                 };
7031
7032                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7033         }
7034
7035         if (!nla[NFTA_OBJ_NAME] ||
7036             !nla[NFTA_OBJ_TYPE])
7037                 return -EINVAL;
7038
7039         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7040         if (IS_ERR(table)) {
7041                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7042                 return PTR_ERR(table);
7043         }
7044
7045         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7046         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7047         if (IS_ERR(obj)) {
7048                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7049                 return PTR_ERR(obj);
7050         }
7051
7052         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7053         if (!skb2)
7054                 return -ENOMEM;
7055
7056         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7057                 reset = true;
7058
7059         if (reset) {
7060                 const struct nftables_pernet *nft_net;
7061                 char *buf;
7062
7063                 nft_net = nft_pernet(net);
7064                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7065
7066                 audit_log_nfcfg(buf,
7067                                 family,
7068                                 obj->handle,
7069                                 AUDIT_NFT_OP_OBJ_RESET,
7070                                 GFP_ATOMIC);
7071                 kfree(buf);
7072         }
7073
7074         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7075                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7076                                       family, table, obj, reset);
7077         if (err < 0)
7078                 goto err_fill_obj_info;
7079
7080         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7081
7082 err_fill_obj_info:
7083         kfree_skb(skb2);
7084         return err;
7085 }
7086
7087 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7088 {
7089         if (obj->ops->destroy)
7090                 obj->ops->destroy(ctx, obj);
7091
7092         module_put(obj->ops->type->owner);
7093         kfree(obj->key.name);
7094         kfree(obj->udata);
7095         kfree(obj);
7096 }
7097
7098 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7099                             const struct nlattr * const nla[])
7100 {
7101         struct netlink_ext_ack *extack = info->extack;
7102         u8 genmask = nft_genmask_next(info->net);
7103         u8 family = info->nfmsg->nfgen_family;
7104         struct net *net = info->net;
7105         const struct nlattr *attr;
7106         struct nft_table *table;
7107         struct nft_object *obj;
7108         struct nft_ctx ctx;
7109         u32 objtype;
7110
7111         if (!nla[NFTA_OBJ_TYPE] ||
7112             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7113                 return -EINVAL;
7114
7115         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7116                                  NETLINK_CB(skb).portid);
7117         if (IS_ERR(table)) {
7118                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7119                 return PTR_ERR(table);
7120         }
7121
7122         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7123         if (nla[NFTA_OBJ_HANDLE]) {
7124                 attr = nla[NFTA_OBJ_HANDLE];
7125                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7126         } else {
7127                 attr = nla[NFTA_OBJ_NAME];
7128                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7129         }
7130
7131         if (IS_ERR(obj)) {
7132                 NL_SET_BAD_ATTR(extack, attr);
7133                 return PTR_ERR(obj);
7134         }
7135         if (obj->use > 0) {
7136                 NL_SET_BAD_ATTR(extack, attr);
7137                 return -EBUSY;
7138         }
7139
7140         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7141
7142         return nft_delobj(&ctx, obj);
7143 }
7144
7145 void nft_obj_notify(struct net *net, const struct nft_table *table,
7146                     struct nft_object *obj, u32 portid, u32 seq, int event,
7147                     u16 flags, int family, int report, gfp_t gfp)
7148 {
7149         struct nftables_pernet *nft_net = nft_pernet(net);
7150         struct sk_buff *skb;
7151         int err;
7152         char *buf = kasprintf(gfp, "%s:%u",
7153                               table->name, nft_net->base_seq);
7154
7155         audit_log_nfcfg(buf,
7156                         family,
7157                         obj->handle,
7158                         event == NFT_MSG_NEWOBJ ?
7159                                  AUDIT_NFT_OP_OBJ_REGISTER :
7160                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7161                         gfp);
7162         kfree(buf);
7163
7164         if (!report &&
7165             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7166                 return;
7167
7168         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7169         if (skb == NULL)
7170                 goto err;
7171
7172         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7173                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7174                                       family, table, obj, false);
7175         if (err < 0) {
7176                 kfree_skb(skb);
7177                 goto err;
7178         }
7179
7180         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7181         return;
7182 err:
7183         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7184 }
7185 EXPORT_SYMBOL_GPL(nft_obj_notify);
7186
7187 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7188                                  struct nft_object *obj, int event)
7189 {
7190         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7191                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7192 }
7193
7194 /*
7195  * Flow tables
7196  */
7197 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7198 {
7199         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7200         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7201         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7202 }
7203 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7204
7205 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7206 {
7207         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7208         list_del_rcu(&type->list);
7209         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7210 }
7211 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7212
7213 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7214         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7215                                             .len = NFT_NAME_MAXLEN - 1 },
7216         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7217                                             .len = NFT_NAME_MAXLEN - 1 },
7218         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7219         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7220         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7221 };
7222
7223 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7224                                            const struct nlattr *nla, u8 genmask)
7225 {
7226         struct nft_flowtable *flowtable;
7227
7228         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7229                 if (!nla_strcmp(nla, flowtable->name) &&
7230                     nft_active_genmask(flowtable, genmask))
7231                         return flowtable;
7232         }
7233         return ERR_PTR(-ENOENT);
7234 }
7235 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7236
7237 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7238                                     struct nft_flowtable *flowtable,
7239                                     enum nft_trans_phase phase)
7240 {
7241         switch (phase) {
7242         case NFT_TRANS_PREPARE:
7243         case NFT_TRANS_ABORT:
7244         case NFT_TRANS_RELEASE:
7245                 flowtable->use--;
7246                 fallthrough;
7247         default:
7248                 return;
7249         }
7250 }
7251 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7252
7253 static struct nft_flowtable *
7254 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7255                               const struct nlattr *nla, u8 genmask)
7256 {
7257        struct nft_flowtable *flowtable;
7258
7259        list_for_each_entry(flowtable, &table->flowtables, list) {
7260                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7261                    nft_active_genmask(flowtable, genmask))
7262                        return flowtable;
7263        }
7264        return ERR_PTR(-ENOENT);
7265 }
7266
7267 struct nft_flowtable_hook {
7268         u32                     num;
7269         int                     priority;
7270         struct list_head        list;
7271 };
7272
7273 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7274         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7275         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7276         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7277 };
7278
7279 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7280                                     const struct nlattr *attr,
7281                                     struct nft_flowtable_hook *flowtable_hook,
7282                                     struct nft_flowtable *flowtable, bool add)
7283 {
7284         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7285         struct nft_hook *hook;
7286         int hooknum, priority;
7287         int err;
7288
7289         INIT_LIST_HEAD(&flowtable_hook->list);
7290
7291         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7292                                           nft_flowtable_hook_policy, NULL);
7293         if (err < 0)
7294                 return err;
7295
7296         if (add) {
7297                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7298                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7299                         return -EINVAL;
7300
7301                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7302                 if (hooknum != NF_NETDEV_INGRESS)
7303                         return -EOPNOTSUPP;
7304
7305                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7306
7307                 flowtable_hook->priority        = priority;
7308                 flowtable_hook->num             = hooknum;
7309         } else {
7310                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7311                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7312                         if (hooknum != flowtable->hooknum)
7313                                 return -EOPNOTSUPP;
7314                 }
7315
7316                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7317                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7318                         if (priority != flowtable->data.priority)
7319                                 return -EOPNOTSUPP;
7320                 }
7321
7322                 flowtable_hook->priority        = flowtable->data.priority;
7323                 flowtable_hook->num             = flowtable->hooknum;
7324         }
7325
7326         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7327                 err = nf_tables_parse_netdev_hooks(ctx->net,
7328                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7329                                                    &flowtable_hook->list);
7330                 if (err < 0)
7331                         return err;
7332         }
7333
7334         list_for_each_entry(hook, &flowtable_hook->list, list) {
7335                 hook->ops.pf            = NFPROTO_NETDEV;
7336                 hook->ops.hooknum       = flowtable_hook->num;
7337                 hook->ops.priority      = flowtable_hook->priority;
7338                 hook->ops.priv          = &flowtable->data;
7339                 hook->ops.hook          = flowtable->data.type->hook;
7340         }
7341
7342         return err;
7343 }
7344
7345 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7346 {
7347         const struct nf_flowtable_type *type;
7348
7349         list_for_each_entry(type, &nf_tables_flowtables, list) {
7350                 if (family == type->family)
7351                         return type;
7352         }
7353         return NULL;
7354 }
7355
7356 static const struct nf_flowtable_type *
7357 nft_flowtable_type_get(struct net *net, u8 family)
7358 {
7359         const struct nf_flowtable_type *type;
7360
7361         type = __nft_flowtable_type_get(family);
7362         if (type != NULL && try_module_get(type->owner))
7363                 return type;
7364
7365         lockdep_nfnl_nft_mutex_not_held();
7366 #ifdef CONFIG_MODULES
7367         if (type == NULL) {
7368                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7369                         return ERR_PTR(-EAGAIN);
7370         }
7371 #endif
7372         return ERR_PTR(-ENOENT);
7373 }
7374
7375 /* Only called from error and netdev event paths. */
7376 static void nft_unregister_flowtable_hook(struct net *net,
7377                                           struct nft_flowtable *flowtable,
7378                                           struct nft_hook *hook)
7379 {
7380         nf_unregister_net_hook(net, &hook->ops);
7381         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7382                                     FLOW_BLOCK_UNBIND);
7383 }
7384
7385 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7386                                                  struct list_head *hook_list,
7387                                                  bool release_netdev)
7388 {
7389         struct nft_hook *hook, *next;
7390
7391         list_for_each_entry_safe(hook, next, hook_list, list) {
7392                 nf_unregister_net_hook(net, &hook->ops);
7393                 if (release_netdev) {
7394                         list_del(&hook->list);
7395                         kfree_rcu(hook, rcu);
7396                 }
7397         }
7398 }
7399
7400 static void nft_unregister_flowtable_net_hooks(struct net *net,
7401                                                struct list_head *hook_list)
7402 {
7403         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7404 }
7405
7406 static int nft_register_flowtable_net_hooks(struct net *net,
7407                                             struct nft_table *table,
7408                                             struct list_head *hook_list,
7409                                             struct nft_flowtable *flowtable)
7410 {
7411         struct nft_hook *hook, *hook2, *next;
7412         struct nft_flowtable *ft;
7413         int err, i = 0;
7414
7415         list_for_each_entry(hook, hook_list, list) {
7416                 list_for_each_entry(ft, &table->flowtables, list) {
7417                         if (!nft_is_active_next(net, ft))
7418                                 continue;
7419
7420                         list_for_each_entry(hook2, &ft->hook_list, list) {
7421                                 if (hook->ops.dev == hook2->ops.dev &&
7422                                     hook->ops.pf == hook2->ops.pf) {
7423                                         err = -EEXIST;
7424                                         goto err_unregister_net_hooks;
7425                                 }
7426                         }
7427                 }
7428
7429                 err = flowtable->data.type->setup(&flowtable->data,
7430                                                   hook->ops.dev,
7431                                                   FLOW_BLOCK_BIND);
7432                 if (err < 0)
7433                         goto err_unregister_net_hooks;
7434
7435                 err = nf_register_net_hook(net, &hook->ops);
7436                 if (err < 0) {
7437                         flowtable->data.type->setup(&flowtable->data,
7438                                                     hook->ops.dev,
7439                                                     FLOW_BLOCK_UNBIND);
7440                         goto err_unregister_net_hooks;
7441                 }
7442
7443                 i++;
7444         }
7445
7446         return 0;
7447
7448 err_unregister_net_hooks:
7449         list_for_each_entry_safe(hook, next, hook_list, list) {
7450                 if (i-- <= 0)
7451                         break;
7452
7453                 nft_unregister_flowtable_hook(net, flowtable, hook);
7454                 list_del_rcu(&hook->list);
7455                 kfree_rcu(hook, rcu);
7456         }
7457
7458         return err;
7459 }
7460
7461 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7462 {
7463         struct nft_hook *hook, *next;
7464
7465         list_for_each_entry_safe(hook, next, hook_list, list) {
7466                 list_del_rcu(&hook->list);
7467                 kfree_rcu(hook, rcu);
7468         }
7469 }
7470
7471 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7472                                 struct nft_flowtable *flowtable)
7473 {
7474         const struct nlattr * const *nla = ctx->nla;
7475         struct nft_flowtable_hook flowtable_hook;
7476         struct nft_hook *hook, *next;
7477         struct nft_trans *trans;
7478         bool unregister = false;
7479         u32 flags;
7480         int err;
7481
7482         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7483                                        &flowtable_hook, flowtable, false);
7484         if (err < 0)
7485                 return err;
7486
7487         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7488                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7489                         list_del(&hook->list);
7490                         kfree(hook);
7491                 }
7492         }
7493
7494         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7495                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7496                 if (flags & ~NFT_FLOWTABLE_MASK) {
7497                         err = -EOPNOTSUPP;
7498                         goto err_flowtable_update_hook;
7499                 }
7500                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7501                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7502                         err = -EOPNOTSUPP;
7503                         goto err_flowtable_update_hook;
7504                 }
7505         } else {
7506                 flags = flowtable->data.flags;
7507         }
7508
7509         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7510                                                &flowtable_hook.list, flowtable);
7511         if (err < 0)
7512                 goto err_flowtable_update_hook;
7513
7514         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7515                                 sizeof(struct nft_trans_flowtable));
7516         if (!trans) {
7517                 unregister = true;
7518                 err = -ENOMEM;
7519                 goto err_flowtable_update_hook;
7520         }
7521
7522         nft_trans_flowtable_flags(trans) = flags;
7523         nft_trans_flowtable(trans) = flowtable;
7524         nft_trans_flowtable_update(trans) = true;
7525         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7526         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7527
7528         nft_trans_commit_list_add_tail(ctx->net, trans);
7529
7530         return 0;
7531
7532 err_flowtable_update_hook:
7533         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7534                 if (unregister)
7535                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7536                 list_del_rcu(&hook->list);
7537                 kfree_rcu(hook, rcu);
7538         }
7539
7540         return err;
7541
7542 }
7543
7544 static int nf_tables_newflowtable(struct sk_buff *skb,
7545                                   const struct nfnl_info *info,
7546                                   const struct nlattr * const nla[])
7547 {
7548         struct netlink_ext_ack *extack = info->extack;
7549         struct nft_flowtable_hook flowtable_hook;
7550         u8 genmask = nft_genmask_next(info->net);
7551         u8 family = info->nfmsg->nfgen_family;
7552         const struct nf_flowtable_type *type;
7553         struct nft_flowtable *flowtable;
7554         struct nft_hook *hook, *next;
7555         struct net *net = info->net;
7556         struct nft_table *table;
7557         struct nft_ctx ctx;
7558         int err;
7559
7560         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7561             !nla[NFTA_FLOWTABLE_NAME] ||
7562             !nla[NFTA_FLOWTABLE_HOOK])
7563                 return -EINVAL;
7564
7565         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7566                                  genmask, NETLINK_CB(skb).portid);
7567         if (IS_ERR(table)) {
7568                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7569                 return PTR_ERR(table);
7570         }
7571
7572         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7573                                          genmask);
7574         if (IS_ERR(flowtable)) {
7575                 err = PTR_ERR(flowtable);
7576                 if (err != -ENOENT) {
7577                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7578                         return err;
7579                 }
7580         } else {
7581                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7582                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7583                         return -EEXIST;
7584                 }
7585
7586                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7587
7588                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7589         }
7590
7591         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7592
7593         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
7594         if (!flowtable)
7595                 return -ENOMEM;
7596
7597         flowtable->table = table;
7598         flowtable->handle = nf_tables_alloc_handle(table);
7599         INIT_LIST_HEAD(&flowtable->hook_list);
7600
7601         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
7602         if (!flowtable->name) {
7603                 err = -ENOMEM;
7604                 goto err1;
7605         }
7606
7607         type = nft_flowtable_type_get(net, family);
7608         if (IS_ERR(type)) {
7609                 err = PTR_ERR(type);
7610                 goto err2;
7611         }
7612
7613         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7614                 flowtable->data.flags =
7615                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7616                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7617                         err = -EOPNOTSUPP;
7618                         goto err3;
7619                 }
7620         }
7621
7622         write_pnet(&flowtable->data.net, net);
7623         flowtable->data.type = type;
7624         err = type->init(&flowtable->data);
7625         if (err < 0)
7626                 goto err3;
7627
7628         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7629                                        &flowtable_hook, flowtable, true);
7630         if (err < 0)
7631                 goto err4;
7632
7633         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7634         flowtable->data.priority = flowtable_hook.priority;
7635         flowtable->hooknum = flowtable_hook.num;
7636
7637         err = nft_register_flowtable_net_hooks(ctx.net, table,
7638                                                &flowtable->hook_list,
7639                                                flowtable);
7640         if (err < 0) {
7641                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7642                 goto err4;
7643         }
7644
7645         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7646         if (err < 0)
7647                 goto err5;
7648
7649         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7650         table->use++;
7651
7652         return 0;
7653 err5:
7654         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7655                 nft_unregister_flowtable_hook(net, flowtable, hook);
7656                 list_del_rcu(&hook->list);
7657                 kfree_rcu(hook, rcu);
7658         }
7659 err4:
7660         flowtable->data.type->free(&flowtable->data);
7661 err3:
7662         module_put(type->owner);
7663 err2:
7664         kfree(flowtable->name);
7665 err1:
7666         kfree(flowtable);
7667         return err;
7668 }
7669
7670 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7671 {
7672         struct nft_hook *this, *next;
7673
7674         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7675                 list_del(&this->list);
7676                 kfree(this);
7677         }
7678 }
7679
7680 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7681                                  struct nft_flowtable *flowtable)
7682 {
7683         const struct nlattr * const *nla = ctx->nla;
7684         struct nft_flowtable_hook flowtable_hook;
7685         LIST_HEAD(flowtable_del_list);
7686         struct nft_hook *this, *hook;
7687         struct nft_trans *trans;
7688         int err;
7689
7690         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7691                                        &flowtable_hook, flowtable, false);
7692         if (err < 0)
7693                 return err;
7694
7695         list_for_each_entry(this, &flowtable_hook.list, list) {
7696                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7697                 if (!hook) {
7698                         err = -ENOENT;
7699                         goto err_flowtable_del_hook;
7700                 }
7701                 list_move(&hook->list, &flowtable_del_list);
7702         }
7703
7704         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7705                                 sizeof(struct nft_trans_flowtable));
7706         if (!trans) {
7707                 err = -ENOMEM;
7708                 goto err_flowtable_del_hook;
7709         }
7710
7711         nft_trans_flowtable(trans) = flowtable;
7712         nft_trans_flowtable_update(trans) = true;
7713         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7714         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7715         nft_flowtable_hook_release(&flowtable_hook);
7716
7717         nft_trans_commit_list_add_tail(ctx->net, trans);
7718
7719         return 0;
7720
7721 err_flowtable_del_hook:
7722         list_splice(&flowtable_del_list, &flowtable->hook_list);
7723         nft_flowtable_hook_release(&flowtable_hook);
7724
7725         return err;
7726 }
7727
7728 static int nf_tables_delflowtable(struct sk_buff *skb,
7729                                   const struct nfnl_info *info,
7730                                   const struct nlattr * const nla[])
7731 {
7732         struct netlink_ext_ack *extack = info->extack;
7733         u8 genmask = nft_genmask_next(info->net);
7734         u8 family = info->nfmsg->nfgen_family;
7735         struct nft_flowtable *flowtable;
7736         struct net *net = info->net;
7737         const struct nlattr *attr;
7738         struct nft_table *table;
7739         struct nft_ctx ctx;
7740
7741         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7742             (!nla[NFTA_FLOWTABLE_NAME] &&
7743              !nla[NFTA_FLOWTABLE_HANDLE]))
7744                 return -EINVAL;
7745
7746         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7747                                  genmask, NETLINK_CB(skb).portid);
7748         if (IS_ERR(table)) {
7749                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7750                 return PTR_ERR(table);
7751         }
7752
7753         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7754                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7755                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7756         } else {
7757                 attr = nla[NFTA_FLOWTABLE_NAME];
7758                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7759         }
7760
7761         if (IS_ERR(flowtable)) {
7762                 NL_SET_BAD_ATTR(extack, attr);
7763                 return PTR_ERR(flowtable);
7764         }
7765
7766         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7767
7768         if (nla[NFTA_FLOWTABLE_HOOK])
7769                 return nft_delflowtable_hook(&ctx, flowtable);
7770
7771         if (flowtable->use > 0) {
7772                 NL_SET_BAD_ATTR(extack, attr);
7773                 return -EBUSY;
7774         }
7775
7776         return nft_delflowtable(&ctx, flowtable);
7777 }
7778
7779 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7780                                          u32 portid, u32 seq, int event,
7781                                          u32 flags, int family,
7782                                          struct nft_flowtable *flowtable,
7783                                          struct list_head *hook_list)
7784 {
7785         struct nlattr *nest, *nest_devs;
7786         struct nft_hook *hook;
7787         struct nlmsghdr *nlh;
7788
7789         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7790         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7791                            NFNETLINK_V0, nft_base_seq(net));
7792         if (!nlh)
7793                 goto nla_put_failure;
7794
7795         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7796             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7797             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7798             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7799                          NFTA_FLOWTABLE_PAD) ||
7800             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7801                 goto nla_put_failure;
7802
7803         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7804         if (!nest)
7805                 goto nla_put_failure;
7806         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7807             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7808                 goto nla_put_failure;
7809
7810         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7811         if (!nest_devs)
7812                 goto nla_put_failure;
7813
7814         list_for_each_entry_rcu(hook, hook_list, list) {
7815                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7816                         goto nla_put_failure;
7817         }
7818         nla_nest_end(skb, nest_devs);
7819         nla_nest_end(skb, nest);
7820
7821         nlmsg_end(skb, nlh);
7822         return 0;
7823
7824 nla_put_failure:
7825         nlmsg_trim(skb, nlh);
7826         return -1;
7827 }
7828
7829 struct nft_flowtable_filter {
7830         char            *table;
7831 };
7832
7833 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7834                                     struct netlink_callback *cb)
7835 {
7836         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7837         struct nft_flowtable_filter *filter = cb->data;
7838         unsigned int idx = 0, s_idx = cb->args[0];
7839         struct net *net = sock_net(skb->sk);
7840         int family = nfmsg->nfgen_family;
7841         struct nft_flowtable *flowtable;
7842         struct nftables_pernet *nft_net;
7843         const struct nft_table *table;
7844
7845         rcu_read_lock();
7846         nft_net = nft_pernet(net);
7847         cb->seq = READ_ONCE(nft_net->base_seq);
7848
7849         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7850                 if (family != NFPROTO_UNSPEC && family != table->family)
7851                         continue;
7852
7853                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7854                         if (!nft_is_active(net, flowtable))
7855                                 goto cont;
7856                         if (idx < s_idx)
7857                                 goto cont;
7858                         if (idx > s_idx)
7859                                 memset(&cb->args[1], 0,
7860                                        sizeof(cb->args) - sizeof(cb->args[0]));
7861                         if (filter && filter->table &&
7862                             strcmp(filter->table, table->name))
7863                                 goto cont;
7864
7865                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7866                                                           cb->nlh->nlmsg_seq,
7867                                                           NFT_MSG_NEWFLOWTABLE,
7868                                                           NLM_F_MULTI | NLM_F_APPEND,
7869                                                           table->family,
7870                                                           flowtable,
7871                                                           &flowtable->hook_list) < 0)
7872                                 goto done;
7873
7874                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7875 cont:
7876                         idx++;
7877                 }
7878         }
7879 done:
7880         rcu_read_unlock();
7881
7882         cb->args[0] = idx;
7883         return skb->len;
7884 }
7885
7886 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7887 {
7888         const struct nlattr * const *nla = cb->data;
7889         struct nft_flowtable_filter *filter = NULL;
7890
7891         if (nla[NFTA_FLOWTABLE_TABLE]) {
7892                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7893                 if (!filter)
7894                         return -ENOMEM;
7895
7896                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7897                                            GFP_ATOMIC);
7898                 if (!filter->table) {
7899                         kfree(filter);
7900                         return -ENOMEM;
7901                 }
7902         }
7903
7904         cb->data = filter;
7905         return 0;
7906 }
7907
7908 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7909 {
7910         struct nft_flowtable_filter *filter = cb->data;
7911
7912         if (!filter)
7913                 return 0;
7914
7915         kfree(filter->table);
7916         kfree(filter);
7917
7918         return 0;
7919 }
7920
7921 /* called with rcu_read_lock held */
7922 static int nf_tables_getflowtable(struct sk_buff *skb,
7923                                   const struct nfnl_info *info,
7924                                   const struct nlattr * const nla[])
7925 {
7926         u8 genmask = nft_genmask_cur(info->net);
7927         u8 family = info->nfmsg->nfgen_family;
7928         struct nft_flowtable *flowtable;
7929         const struct nft_table *table;
7930         struct net *net = info->net;
7931         struct sk_buff *skb2;
7932         int err;
7933
7934         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7935                 struct netlink_dump_control c = {
7936                         .start = nf_tables_dump_flowtable_start,
7937                         .dump = nf_tables_dump_flowtable,
7938                         .done = nf_tables_dump_flowtable_done,
7939                         .module = THIS_MODULE,
7940                         .data = (void *)nla,
7941                 };
7942
7943                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7944         }
7945
7946         if (!nla[NFTA_FLOWTABLE_NAME])
7947                 return -EINVAL;
7948
7949         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7950                                  genmask, 0);
7951         if (IS_ERR(table))
7952                 return PTR_ERR(table);
7953
7954         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7955                                          genmask);
7956         if (IS_ERR(flowtable))
7957                 return PTR_ERR(flowtable);
7958
7959         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7960         if (!skb2)
7961                 return -ENOMEM;
7962
7963         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7964                                             info->nlh->nlmsg_seq,
7965                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7966                                             flowtable, &flowtable->hook_list);
7967         if (err < 0)
7968                 goto err_fill_flowtable_info;
7969
7970         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7971
7972 err_fill_flowtable_info:
7973         kfree_skb(skb2);
7974         return err;
7975 }
7976
7977 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7978                                        struct nft_flowtable *flowtable,
7979                                        struct list_head *hook_list,
7980                                        int event)
7981 {
7982         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
7983         struct sk_buff *skb;
7984         u16 flags = 0;
7985         int err;
7986
7987         if (!ctx->report &&
7988             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7989                 return;
7990
7991         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7992         if (skb == NULL)
7993                 goto err;
7994
7995         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
7996                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
7997
7998         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7999                                             ctx->seq, event, flags,
8000                                             ctx->family, flowtable, hook_list);
8001         if (err < 0) {
8002                 kfree_skb(skb);
8003                 goto err;
8004         }
8005
8006         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8007         return;
8008 err:
8009         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8010 }
8011
8012 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8013 {
8014         struct nft_hook *hook, *next;
8015
8016         flowtable->data.type->free(&flowtable->data);
8017         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8018                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8019                                             FLOW_BLOCK_UNBIND);
8020                 list_del_rcu(&hook->list);
8021                 kfree(hook);
8022         }
8023         kfree(flowtable->name);
8024         module_put(flowtable->data.type->owner);
8025         kfree(flowtable);
8026 }
8027
8028 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8029                                    u32 portid, u32 seq)
8030 {
8031         struct nftables_pernet *nft_net = nft_pernet(net);
8032         struct nlmsghdr *nlh;
8033         char buf[TASK_COMM_LEN];
8034         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8035
8036         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8037                            NFNETLINK_V0, nft_base_seq(net));
8038         if (!nlh)
8039                 goto nla_put_failure;
8040
8041         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8042             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8043             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8044                 goto nla_put_failure;
8045
8046         nlmsg_end(skb, nlh);
8047         return 0;
8048
8049 nla_put_failure:
8050         nlmsg_trim(skb, nlh);
8051         return -EMSGSIZE;
8052 }
8053
8054 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8055                                 struct nft_flowtable *flowtable)
8056 {
8057         struct nft_hook *hook;
8058
8059         list_for_each_entry(hook, &flowtable->hook_list, list) {
8060                 if (hook->ops.dev != dev)
8061                         continue;
8062
8063                 /* flow_offload_netdev_event() cleans up entries for us. */
8064                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8065                 list_del_rcu(&hook->list);
8066                 kfree_rcu(hook, rcu);
8067                 break;
8068         }
8069 }
8070
8071 static int nf_tables_flowtable_event(struct notifier_block *this,
8072                                      unsigned long event, void *ptr)
8073 {
8074         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8075         struct nft_flowtable *flowtable;
8076         struct nftables_pernet *nft_net;
8077         struct nft_table *table;
8078         struct net *net;
8079
8080         if (event != NETDEV_UNREGISTER)
8081                 return 0;
8082
8083         net = dev_net(dev);
8084         nft_net = nft_pernet(net);
8085         mutex_lock(&nft_net->commit_mutex);
8086         list_for_each_entry(table, &nft_net->tables, list) {
8087                 list_for_each_entry(flowtable, &table->flowtables, list) {
8088                         nft_flowtable_event(event, dev, flowtable);
8089                 }
8090         }
8091         mutex_unlock(&nft_net->commit_mutex);
8092
8093         return NOTIFY_DONE;
8094 }
8095
8096 static struct notifier_block nf_tables_flowtable_notifier = {
8097         .notifier_call  = nf_tables_flowtable_event,
8098 };
8099
8100 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8101                                  int event)
8102 {
8103         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8104         struct sk_buff *skb2;
8105         int err;
8106
8107         if (!nlmsg_report(nlh) &&
8108             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8109                 return;
8110
8111         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8112         if (skb2 == NULL)
8113                 goto err;
8114
8115         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8116                                       nlh->nlmsg_seq);
8117         if (err < 0) {
8118                 kfree_skb(skb2);
8119                 goto err;
8120         }
8121
8122         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8123                        nlmsg_report(nlh), GFP_KERNEL);
8124         return;
8125 err:
8126         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8127                           -ENOBUFS);
8128 }
8129
8130 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8131                             const struct nlattr * const nla[])
8132 {
8133         struct sk_buff *skb2;
8134         int err;
8135
8136         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8137         if (skb2 == NULL)
8138                 return -ENOMEM;
8139
8140         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8141                                       info->nlh->nlmsg_seq);
8142         if (err < 0)
8143                 goto err_fill_gen_info;
8144
8145         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8146
8147 err_fill_gen_info:
8148         kfree_skb(skb2);
8149         return err;
8150 }
8151
8152 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8153         [NFT_MSG_NEWTABLE] = {
8154                 .call           = nf_tables_newtable,
8155                 .type           = NFNL_CB_BATCH,
8156                 .attr_count     = NFTA_TABLE_MAX,
8157                 .policy         = nft_table_policy,
8158         },
8159         [NFT_MSG_GETTABLE] = {
8160                 .call           = nf_tables_gettable,
8161                 .type           = NFNL_CB_RCU,
8162                 .attr_count     = NFTA_TABLE_MAX,
8163                 .policy         = nft_table_policy,
8164         },
8165         [NFT_MSG_DELTABLE] = {
8166                 .call           = nf_tables_deltable,
8167                 .type           = NFNL_CB_BATCH,
8168                 .attr_count     = NFTA_TABLE_MAX,
8169                 .policy         = nft_table_policy,
8170         },
8171         [NFT_MSG_NEWCHAIN] = {
8172                 .call           = nf_tables_newchain,
8173                 .type           = NFNL_CB_BATCH,
8174                 .attr_count     = NFTA_CHAIN_MAX,
8175                 .policy         = nft_chain_policy,
8176         },
8177         [NFT_MSG_GETCHAIN] = {
8178                 .call           = nf_tables_getchain,
8179                 .type           = NFNL_CB_RCU,
8180                 .attr_count     = NFTA_CHAIN_MAX,
8181                 .policy         = nft_chain_policy,
8182         },
8183         [NFT_MSG_DELCHAIN] = {
8184                 .call           = nf_tables_delchain,
8185                 .type           = NFNL_CB_BATCH,
8186                 .attr_count     = NFTA_CHAIN_MAX,
8187                 .policy         = nft_chain_policy,
8188         },
8189         [NFT_MSG_NEWRULE] = {
8190                 .call           = nf_tables_newrule,
8191                 .type           = NFNL_CB_BATCH,
8192                 .attr_count     = NFTA_RULE_MAX,
8193                 .policy         = nft_rule_policy,
8194         },
8195         [NFT_MSG_GETRULE] = {
8196                 .call           = nf_tables_getrule,
8197                 .type           = NFNL_CB_RCU,
8198                 .attr_count     = NFTA_RULE_MAX,
8199                 .policy         = nft_rule_policy,
8200         },
8201         [NFT_MSG_DELRULE] = {
8202                 .call           = nf_tables_delrule,
8203                 .type           = NFNL_CB_BATCH,
8204                 .attr_count     = NFTA_RULE_MAX,
8205                 .policy         = nft_rule_policy,
8206         },
8207         [NFT_MSG_NEWSET] = {
8208                 .call           = nf_tables_newset,
8209                 .type           = NFNL_CB_BATCH,
8210                 .attr_count     = NFTA_SET_MAX,
8211                 .policy         = nft_set_policy,
8212         },
8213         [NFT_MSG_GETSET] = {
8214                 .call           = nf_tables_getset,
8215                 .type           = NFNL_CB_RCU,
8216                 .attr_count     = NFTA_SET_MAX,
8217                 .policy         = nft_set_policy,
8218         },
8219         [NFT_MSG_DELSET] = {
8220                 .call           = nf_tables_delset,
8221                 .type           = NFNL_CB_BATCH,
8222                 .attr_count     = NFTA_SET_MAX,
8223                 .policy         = nft_set_policy,
8224         },
8225         [NFT_MSG_NEWSETELEM] = {
8226                 .call           = nf_tables_newsetelem,
8227                 .type           = NFNL_CB_BATCH,
8228                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8229                 .policy         = nft_set_elem_list_policy,
8230         },
8231         [NFT_MSG_GETSETELEM] = {
8232                 .call           = nf_tables_getsetelem,
8233                 .type           = NFNL_CB_RCU,
8234                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8235                 .policy         = nft_set_elem_list_policy,
8236         },
8237         [NFT_MSG_DELSETELEM] = {
8238                 .call           = nf_tables_delsetelem,
8239                 .type           = NFNL_CB_BATCH,
8240                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8241                 .policy         = nft_set_elem_list_policy,
8242         },
8243         [NFT_MSG_GETGEN] = {
8244                 .call           = nf_tables_getgen,
8245                 .type           = NFNL_CB_RCU,
8246         },
8247         [NFT_MSG_NEWOBJ] = {
8248                 .call           = nf_tables_newobj,
8249                 .type           = NFNL_CB_BATCH,
8250                 .attr_count     = NFTA_OBJ_MAX,
8251                 .policy         = nft_obj_policy,
8252         },
8253         [NFT_MSG_GETOBJ] = {
8254                 .call           = nf_tables_getobj,
8255                 .type           = NFNL_CB_RCU,
8256                 .attr_count     = NFTA_OBJ_MAX,
8257                 .policy         = nft_obj_policy,
8258         },
8259         [NFT_MSG_DELOBJ] = {
8260                 .call           = nf_tables_delobj,
8261                 .type           = NFNL_CB_BATCH,
8262                 .attr_count     = NFTA_OBJ_MAX,
8263                 .policy         = nft_obj_policy,
8264         },
8265         [NFT_MSG_GETOBJ_RESET] = {
8266                 .call           = nf_tables_getobj,
8267                 .type           = NFNL_CB_RCU,
8268                 .attr_count     = NFTA_OBJ_MAX,
8269                 .policy         = nft_obj_policy,
8270         },
8271         [NFT_MSG_NEWFLOWTABLE] = {
8272                 .call           = nf_tables_newflowtable,
8273                 .type           = NFNL_CB_BATCH,
8274                 .attr_count     = NFTA_FLOWTABLE_MAX,
8275                 .policy         = nft_flowtable_policy,
8276         },
8277         [NFT_MSG_GETFLOWTABLE] = {
8278                 .call           = nf_tables_getflowtable,
8279                 .type           = NFNL_CB_RCU,
8280                 .attr_count     = NFTA_FLOWTABLE_MAX,
8281                 .policy         = nft_flowtable_policy,
8282         },
8283         [NFT_MSG_DELFLOWTABLE] = {
8284                 .call           = nf_tables_delflowtable,
8285                 .type           = NFNL_CB_BATCH,
8286                 .attr_count     = NFTA_FLOWTABLE_MAX,
8287                 .policy         = nft_flowtable_policy,
8288         },
8289 };
8290
8291 static int nf_tables_validate(struct net *net)
8292 {
8293         struct nftables_pernet *nft_net = nft_pernet(net);
8294         struct nft_table *table;
8295
8296         switch (nft_net->validate_state) {
8297         case NFT_VALIDATE_SKIP:
8298                 break;
8299         case NFT_VALIDATE_NEED:
8300                 nft_validate_state_update(net, NFT_VALIDATE_DO);
8301                 fallthrough;
8302         case NFT_VALIDATE_DO:
8303                 list_for_each_entry(table, &nft_net->tables, list) {
8304                         if (nft_table_validate(net, table) < 0)
8305                                 return -EAGAIN;
8306                 }
8307                 break;
8308         }
8309
8310         return 0;
8311 }
8312
8313 /* a drop policy has to be deferred until all rules have been activated,
8314  * otherwise a large ruleset that contains a drop-policy base chain will
8315  * cause all packets to get dropped until the full transaction has been
8316  * processed.
8317  *
8318  * We defer the drop policy until the transaction has been finalized.
8319  */
8320 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8321 {
8322         struct nft_base_chain *basechain;
8323
8324         if (nft_trans_chain_policy(trans) != NF_DROP)
8325                 return;
8326
8327         if (!nft_is_base_chain(trans->ctx.chain))
8328                 return;
8329
8330         basechain = nft_base_chain(trans->ctx.chain);
8331         basechain->policy = NF_DROP;
8332 }
8333
8334 static void nft_chain_commit_update(struct nft_trans *trans)
8335 {
8336         struct nft_base_chain *basechain;
8337
8338         if (nft_trans_chain_name(trans)) {
8339                 rhltable_remove(&trans->ctx.table->chains_ht,
8340                                 &trans->ctx.chain->rhlhead,
8341                                 nft_chain_ht_params);
8342                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8343                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8344                                     trans->ctx.chain->name,
8345                                     &trans->ctx.chain->rhlhead,
8346                                     nft_chain_ht_params);
8347         }
8348
8349         if (!nft_is_base_chain(trans->ctx.chain))
8350                 return;
8351
8352         nft_chain_stats_replace(trans);
8353
8354         basechain = nft_base_chain(trans->ctx.chain);
8355
8356         switch (nft_trans_chain_policy(trans)) {
8357         case NF_DROP:
8358         case NF_ACCEPT:
8359                 basechain->policy = nft_trans_chain_policy(trans);
8360                 break;
8361         }
8362 }
8363
8364 static void nft_obj_commit_update(struct nft_trans *trans)
8365 {
8366         struct nft_object *newobj;
8367         struct nft_object *obj;
8368
8369         obj = nft_trans_obj(trans);
8370         newobj = nft_trans_obj_newobj(trans);
8371
8372         if (obj->ops->update)
8373                 obj->ops->update(obj, newobj);
8374
8375         nft_obj_destroy(&trans->ctx, newobj);
8376 }
8377
8378 static void nft_commit_release(struct nft_trans *trans)
8379 {
8380         switch (trans->msg_type) {
8381         case NFT_MSG_DELTABLE:
8382                 nf_tables_table_destroy(&trans->ctx);
8383                 break;
8384         case NFT_MSG_NEWCHAIN:
8385                 free_percpu(nft_trans_chain_stats(trans));
8386                 kfree(nft_trans_chain_name(trans));
8387                 break;
8388         case NFT_MSG_DELCHAIN:
8389                 nf_tables_chain_destroy(&trans->ctx);
8390                 break;
8391         case NFT_MSG_DELRULE:
8392                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8393                 break;
8394         case NFT_MSG_DELSET:
8395                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8396                 break;
8397         case NFT_MSG_DELSETELEM:
8398                 nf_tables_set_elem_destroy(&trans->ctx,
8399                                            nft_trans_elem_set(trans),
8400                                            nft_trans_elem(trans).priv);
8401                 break;
8402         case NFT_MSG_DELOBJ:
8403                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8404                 break;
8405         case NFT_MSG_DELFLOWTABLE:
8406                 if (nft_trans_flowtable_update(trans))
8407                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8408                 else
8409                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8410                 break;
8411         }
8412
8413         if (trans->put_net)
8414                 put_net(trans->ctx.net);
8415
8416         kfree(trans);
8417 }
8418
8419 static void nf_tables_trans_destroy_work(struct work_struct *w)
8420 {
8421         struct nft_trans *trans, *next;
8422         LIST_HEAD(head);
8423
8424         spin_lock(&nf_tables_destroy_list_lock);
8425         list_splice_init(&nf_tables_destroy_list, &head);
8426         spin_unlock(&nf_tables_destroy_list_lock);
8427
8428         if (list_empty(&head))
8429                 return;
8430
8431         synchronize_rcu();
8432
8433         list_for_each_entry_safe(trans, next, &head, list) {
8434                 list_del(&trans->list);
8435                 nft_commit_release(trans);
8436         }
8437 }
8438
8439 void nf_tables_trans_destroy_flush_work(void)
8440 {
8441         flush_work(&trans_destroy_work);
8442 }
8443 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8444
8445 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8446 {
8447         struct nft_rule *rule;
8448         unsigned int alloc = 0;
8449         int i;
8450
8451         /* already handled or inactive chain? */
8452         if (chain->rules_next || !nft_is_active_next(net, chain))
8453                 return 0;
8454
8455         rule = list_entry(&chain->rules, struct nft_rule, list);
8456         i = 0;
8457
8458         list_for_each_entry_continue(rule, &chain->rules, list) {
8459                 if (nft_is_active_next(net, rule))
8460                         alloc++;
8461         }
8462
8463         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
8464         if (!chain->rules_next)
8465                 return -ENOMEM;
8466
8467         list_for_each_entry_continue(rule, &chain->rules, list) {
8468                 if (nft_is_active_next(net, rule))
8469                         chain->rules_next[i++] = rule;
8470         }
8471
8472         chain->rules_next[i] = NULL;
8473         return 0;
8474 }
8475
8476 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8477 {
8478         struct nftables_pernet *nft_net = nft_pernet(net);
8479         struct nft_trans *trans, *next;
8480
8481         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8482                 struct nft_chain *chain = trans->ctx.chain;
8483
8484                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8485                     trans->msg_type == NFT_MSG_DELRULE) {
8486                         kvfree(chain->rules_next);
8487                         chain->rules_next = NULL;
8488                 }
8489         }
8490 }
8491
8492 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8493 {
8494         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8495
8496         kvfree(o->start);
8497 }
8498
8499 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
8500 {
8501         struct nft_rule **r = rules;
8502         struct nft_rules_old *old;
8503
8504         while (*r)
8505                 r++;
8506
8507         r++;    /* rcu_head is after end marker */
8508         old = (void *) r;
8509         old->start = rules;
8510
8511         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8512 }
8513
8514 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8515 {
8516         struct nft_rule **g0, **g1;
8517         bool next_genbit;
8518
8519         next_genbit = nft_gencursor_next(net);
8520
8521         g0 = rcu_dereference_protected(chain->rules_gen_0,
8522                                        lockdep_commit_lock_is_held(net));
8523         g1 = rcu_dereference_protected(chain->rules_gen_1,
8524                                        lockdep_commit_lock_is_held(net));
8525
8526         /* No changes to this chain? */
8527         if (chain->rules_next == NULL) {
8528                 /* chain had no change in last or next generation */
8529                 if (g0 == g1)
8530                         return;
8531                 /*
8532                  * chain had no change in this generation; make sure next
8533                  * one uses same rules as current generation.
8534                  */
8535                 if (next_genbit) {
8536                         rcu_assign_pointer(chain->rules_gen_1, g0);
8537                         nf_tables_commit_chain_free_rules_old(g1);
8538                 } else {
8539                         rcu_assign_pointer(chain->rules_gen_0, g1);
8540                         nf_tables_commit_chain_free_rules_old(g0);
8541                 }
8542
8543                 return;
8544         }
8545
8546         if (next_genbit)
8547                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
8548         else
8549                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
8550
8551         chain->rules_next = NULL;
8552
8553         if (g0 == g1)
8554                 return;
8555
8556         if (next_genbit)
8557                 nf_tables_commit_chain_free_rules_old(g1);
8558         else
8559                 nf_tables_commit_chain_free_rules_old(g0);
8560 }
8561
8562 static void nft_obj_del(struct nft_object *obj)
8563 {
8564         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8565         list_del_rcu(&obj->list);
8566 }
8567
8568 void nft_chain_del(struct nft_chain *chain)
8569 {
8570         struct nft_table *table = chain->table;
8571
8572         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8573                                      nft_chain_ht_params));
8574         list_del_rcu(&chain->list);
8575 }
8576
8577 static void nf_tables_module_autoload_cleanup(struct net *net)
8578 {
8579         struct nftables_pernet *nft_net = nft_pernet(net);
8580         struct nft_module_request *req, *next;
8581
8582         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8583         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8584                 WARN_ON_ONCE(!req->done);
8585                 list_del(&req->list);
8586                 kfree(req);
8587         }
8588 }
8589
8590 static void nf_tables_commit_release(struct net *net)
8591 {
8592         struct nftables_pernet *nft_net = nft_pernet(net);
8593         struct nft_trans *trans;
8594
8595         /* all side effects have to be made visible.
8596          * For example, if a chain named 'foo' has been deleted, a
8597          * new transaction must not find it anymore.
8598          *
8599          * Memory reclaim happens asynchronously from work queue
8600          * to prevent expensive synchronize_rcu() in commit phase.
8601          */
8602         if (list_empty(&nft_net->commit_list)) {
8603                 nf_tables_module_autoload_cleanup(net);
8604                 mutex_unlock(&nft_net->commit_mutex);
8605                 return;
8606         }
8607
8608         trans = list_last_entry(&nft_net->commit_list,
8609                                 struct nft_trans, list);
8610         get_net(trans->ctx.net);
8611         WARN_ON_ONCE(trans->put_net);
8612
8613         trans->put_net = true;
8614         spin_lock(&nf_tables_destroy_list_lock);
8615         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8616         spin_unlock(&nf_tables_destroy_list_lock);
8617
8618         nf_tables_module_autoload_cleanup(net);
8619         schedule_work(&trans_destroy_work);
8620
8621         mutex_unlock(&nft_net->commit_mutex);
8622 }
8623
8624 static void nft_commit_notify(struct net *net, u32 portid)
8625 {
8626         struct nftables_pernet *nft_net = nft_pernet(net);
8627         struct sk_buff *batch_skb = NULL, *nskb, *skb;
8628         unsigned char *data;
8629         int len;
8630
8631         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8632                 if (!batch_skb) {
8633 new_batch:
8634                         batch_skb = skb;
8635                         len = NLMSG_GOODSIZE - skb->len;
8636                         list_del(&skb->list);
8637                         continue;
8638                 }
8639                 len -= skb->len;
8640                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8641                         data = skb_put(batch_skb, skb->len);
8642                         memcpy(data, skb->data, skb->len);
8643                         list_del(&skb->list);
8644                         kfree_skb(skb);
8645                         continue;
8646                 }
8647                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8648                                NFT_CB(batch_skb).report, GFP_KERNEL);
8649                 goto new_batch;
8650         }
8651
8652         if (batch_skb) {
8653                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8654                                NFT_CB(batch_skb).report, GFP_KERNEL);
8655         }
8656
8657         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8658 }
8659
8660 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8661                                         struct nft_table *table)
8662 {
8663         struct nft_audit_data *adp;
8664
8665         list_for_each_entry(adp, adl, list) {
8666                 if (adp->table == table)
8667                         return 0;
8668         }
8669         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8670         if (!adp)
8671                 return -ENOMEM;
8672         adp->table = table;
8673         list_add(&adp->list, adl);
8674         return 0;
8675 }
8676
8677 static void nf_tables_commit_audit_free(struct list_head *adl)
8678 {
8679         struct nft_audit_data *adp, *adn;
8680
8681         list_for_each_entry_safe(adp, adn, adl, list) {
8682                 list_del(&adp->list);
8683                 kfree(adp);
8684         }
8685 }
8686
8687 static void nf_tables_commit_audit_collect(struct list_head *adl,
8688                                            struct nft_table *table, u32 op)
8689 {
8690         struct nft_audit_data *adp;
8691
8692         list_for_each_entry(adp, adl, list) {
8693                 if (adp->table == table)
8694                         goto found;
8695         }
8696         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8697         return;
8698 found:
8699         adp->entries++;
8700         if (!adp->op || adp->op > op)
8701                 adp->op = op;
8702 }
8703
8704 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8705
8706 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8707 {
8708         struct nft_audit_data *adp, *adn;
8709         char aubuf[AUNFTABLENAMELEN];
8710
8711         list_for_each_entry_safe(adp, adn, adl, list) {
8712                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8713                          generation);
8714                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8715                                 nft2audit_op[adp->op], GFP_KERNEL);
8716                 list_del(&adp->list);
8717                 kfree(adp);
8718         }
8719 }
8720
8721 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8722 {
8723         struct nftables_pernet *nft_net = nft_pernet(net);
8724         struct nft_trans *trans, *next;
8725         struct nft_trans_elem *te;
8726         struct nft_chain *chain;
8727         struct nft_table *table;
8728         unsigned int base_seq;
8729         LIST_HEAD(adl);
8730         int err;
8731
8732         if (list_empty(&nft_net->commit_list)) {
8733                 mutex_unlock(&nft_net->commit_mutex);
8734                 return 0;
8735         }
8736
8737         /* 0. Validate ruleset, otherwise roll back for error reporting. */
8738         if (nf_tables_validate(net) < 0)
8739                 return -EAGAIN;
8740
8741         err = nft_flow_rule_offload_commit(net);
8742         if (err < 0)
8743                 return err;
8744
8745         /* 1.  Allocate space for next generation rules_gen_X[] */
8746         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8747                 int ret;
8748
8749                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8750                 if (ret) {
8751                         nf_tables_commit_chain_prepare_cancel(net);
8752                         nf_tables_commit_audit_free(&adl);
8753                         return ret;
8754                 }
8755                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8756                     trans->msg_type == NFT_MSG_DELRULE) {
8757                         chain = trans->ctx.chain;
8758
8759                         ret = nf_tables_commit_chain_prepare(net, chain);
8760                         if (ret < 0) {
8761                                 nf_tables_commit_chain_prepare_cancel(net);
8762                                 nf_tables_commit_audit_free(&adl);
8763                                 return ret;
8764                         }
8765                 }
8766         }
8767
8768         /* step 2.  Make rules_gen_X visible to packet path */
8769         list_for_each_entry(table, &nft_net->tables, list) {
8770                 list_for_each_entry(chain, &table->chains, list)
8771                         nf_tables_commit_chain(net, chain);
8772         }
8773
8774         /*
8775          * Bump generation counter, invalidate any dump in progress.
8776          * Cannot fail after this point.
8777          */
8778         base_seq = READ_ONCE(nft_net->base_seq);
8779         while (++base_seq == 0)
8780                 ;
8781
8782         WRITE_ONCE(nft_net->base_seq, base_seq);
8783
8784         /* step 3. Start new generation, rules_gen_X now in use. */
8785         net->nft.gencursor = nft_gencursor_next(net);
8786
8787         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8788                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8789                                                trans->msg_type);
8790                 switch (trans->msg_type) {
8791                 case NFT_MSG_NEWTABLE:
8792                         if (nft_trans_table_update(trans)) {
8793                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8794                                         nft_trans_destroy(trans);
8795                                         break;
8796                                 }
8797                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8798                                         nf_tables_table_disable(net, trans->ctx.table);
8799
8800                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8801                         } else {
8802                                 nft_clear(net, trans->ctx.table);
8803                         }
8804                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8805                         nft_trans_destroy(trans);
8806                         break;
8807                 case NFT_MSG_DELTABLE:
8808                         list_del_rcu(&trans->ctx.table->list);
8809                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8810                         break;
8811                 case NFT_MSG_NEWCHAIN:
8812                         if (nft_trans_chain_update(trans)) {
8813                                 nft_chain_commit_update(trans);
8814                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8815                                 /* trans destroyed after rcu grace period */
8816                         } else {
8817                                 nft_chain_commit_drop_policy(trans);
8818                                 nft_clear(net, trans->ctx.chain);
8819                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8820                                 nft_trans_destroy(trans);
8821                         }
8822                         break;
8823                 case NFT_MSG_DELCHAIN:
8824                         nft_chain_del(trans->ctx.chain);
8825                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8826                         nf_tables_unregister_hook(trans->ctx.net,
8827                                                   trans->ctx.table,
8828                                                   trans->ctx.chain);
8829                         break;
8830                 case NFT_MSG_NEWRULE:
8831                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8832                         nf_tables_rule_notify(&trans->ctx,
8833                                               nft_trans_rule(trans),
8834                                               NFT_MSG_NEWRULE);
8835                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8836                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8837
8838                         nft_trans_destroy(trans);
8839                         break;
8840                 case NFT_MSG_DELRULE:
8841                         list_del_rcu(&nft_trans_rule(trans)->list);
8842                         nf_tables_rule_notify(&trans->ctx,
8843                                               nft_trans_rule(trans),
8844                                               NFT_MSG_DELRULE);
8845                         nft_rule_expr_deactivate(&trans->ctx,
8846                                                  nft_trans_rule(trans),
8847                                                  NFT_TRANS_COMMIT);
8848
8849                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8850                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8851                         break;
8852                 case NFT_MSG_NEWSET:
8853                         if (nft_trans_set_update(trans)) {
8854                                 struct nft_set *set = nft_trans_set(trans);
8855
8856                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
8857                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
8858                         } else {
8859                                 nft_clear(net, nft_trans_set(trans));
8860                                 /* This avoids hitting -EBUSY when deleting the table
8861                                  * from the transaction.
8862                                  */
8863                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8864                                     !list_empty(&nft_trans_set(trans)->bindings))
8865                                         trans->ctx.table->use--;
8866                         }
8867                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8868                                              NFT_MSG_NEWSET, GFP_KERNEL);
8869                         nft_trans_destroy(trans);
8870                         break;
8871                 case NFT_MSG_DELSET:
8872                         list_del_rcu(&nft_trans_set(trans)->list);
8873                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8874                                              NFT_MSG_DELSET, GFP_KERNEL);
8875                         break;
8876                 case NFT_MSG_NEWSETELEM:
8877                         te = (struct nft_trans_elem *)trans->data;
8878
8879                         nft_setelem_activate(net, te->set, &te->elem);
8880                         nf_tables_setelem_notify(&trans->ctx, te->set,
8881                                                  &te->elem,
8882                                                  NFT_MSG_NEWSETELEM);
8883                         nft_trans_destroy(trans);
8884                         break;
8885                 case NFT_MSG_DELSETELEM:
8886                         te = (struct nft_trans_elem *)trans->data;
8887
8888                         nf_tables_setelem_notify(&trans->ctx, te->set,
8889                                                  &te->elem,
8890                                                  NFT_MSG_DELSETELEM);
8891                         nft_setelem_remove(net, te->set, &te->elem);
8892                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8893                                 atomic_dec(&te->set->nelems);
8894                                 te->set->ndeact--;
8895                         }
8896                         break;
8897                 case NFT_MSG_NEWOBJ:
8898                         if (nft_trans_obj_update(trans)) {
8899                                 nft_obj_commit_update(trans);
8900                                 nf_tables_obj_notify(&trans->ctx,
8901                                                      nft_trans_obj(trans),
8902                                                      NFT_MSG_NEWOBJ);
8903                         } else {
8904                                 nft_clear(net, nft_trans_obj(trans));
8905                                 nf_tables_obj_notify(&trans->ctx,
8906                                                      nft_trans_obj(trans),
8907                                                      NFT_MSG_NEWOBJ);
8908                                 nft_trans_destroy(trans);
8909                         }
8910                         break;
8911                 case NFT_MSG_DELOBJ:
8912                         nft_obj_del(nft_trans_obj(trans));
8913                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8914                                              NFT_MSG_DELOBJ);
8915                         break;
8916                 case NFT_MSG_NEWFLOWTABLE:
8917                         if (nft_trans_flowtable_update(trans)) {
8918                                 nft_trans_flowtable(trans)->data.flags =
8919                                         nft_trans_flowtable_flags(trans);
8920                                 nf_tables_flowtable_notify(&trans->ctx,
8921                                                            nft_trans_flowtable(trans),
8922                                                            &nft_trans_flowtable_hooks(trans),
8923                                                            NFT_MSG_NEWFLOWTABLE);
8924                                 list_splice(&nft_trans_flowtable_hooks(trans),
8925                                             &nft_trans_flowtable(trans)->hook_list);
8926                         } else {
8927                                 nft_clear(net, nft_trans_flowtable(trans));
8928                                 nf_tables_flowtable_notify(&trans->ctx,
8929                                                            nft_trans_flowtable(trans),
8930                                                            &nft_trans_flowtable(trans)->hook_list,
8931                                                            NFT_MSG_NEWFLOWTABLE);
8932                         }
8933                         nft_trans_destroy(trans);
8934                         break;
8935                 case NFT_MSG_DELFLOWTABLE:
8936                         if (nft_trans_flowtable_update(trans)) {
8937                                 nf_tables_flowtable_notify(&trans->ctx,
8938                                                            nft_trans_flowtable(trans),
8939                                                            &nft_trans_flowtable_hooks(trans),
8940                                                            NFT_MSG_DELFLOWTABLE);
8941                                 nft_unregister_flowtable_net_hooks(net,
8942                                                                    &nft_trans_flowtable_hooks(trans));
8943                         } else {
8944                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8945                                 nf_tables_flowtable_notify(&trans->ctx,
8946                                                            nft_trans_flowtable(trans),
8947                                                            &nft_trans_flowtable(trans)->hook_list,
8948                                                            NFT_MSG_DELFLOWTABLE);
8949                                 nft_unregister_flowtable_net_hooks(net,
8950                                                 &nft_trans_flowtable(trans)->hook_list);
8951                         }
8952                         break;
8953                 }
8954         }
8955
8956         nft_commit_notify(net, NETLINK_CB(skb).portid);
8957         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8958         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
8959         nf_tables_commit_release(net);
8960
8961         return 0;
8962 }
8963
8964 static void nf_tables_module_autoload(struct net *net)
8965 {
8966         struct nftables_pernet *nft_net = nft_pernet(net);
8967         struct nft_module_request *req, *next;
8968         LIST_HEAD(module_list);
8969
8970         list_splice_init(&nft_net->module_list, &module_list);
8971         mutex_unlock(&nft_net->commit_mutex);
8972         list_for_each_entry_safe(req, next, &module_list, list) {
8973                 request_module("%s", req->module);
8974                 req->done = true;
8975         }
8976         mutex_lock(&nft_net->commit_mutex);
8977         list_splice(&module_list, &nft_net->module_list);
8978 }
8979
8980 static void nf_tables_abort_release(struct nft_trans *trans)
8981 {
8982         switch (trans->msg_type) {
8983         case NFT_MSG_NEWTABLE:
8984                 nf_tables_table_destroy(&trans->ctx);
8985                 break;
8986         case NFT_MSG_NEWCHAIN:
8987                 nf_tables_chain_destroy(&trans->ctx);
8988                 break;
8989         case NFT_MSG_NEWRULE:
8990                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8991                 break;
8992         case NFT_MSG_NEWSET:
8993                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8994                 break;
8995         case NFT_MSG_NEWSETELEM:
8996                 nft_set_elem_destroy(nft_trans_elem_set(trans),
8997                                      nft_trans_elem(trans).priv, true);
8998                 break;
8999         case NFT_MSG_NEWOBJ:
9000                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9001                 break;
9002         case NFT_MSG_NEWFLOWTABLE:
9003                 if (nft_trans_flowtable_update(trans))
9004                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9005                 else
9006                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9007                 break;
9008         }
9009         kfree(trans);
9010 }
9011
9012 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9013 {
9014         struct nftables_pernet *nft_net = nft_pernet(net);
9015         struct nft_trans *trans, *next;
9016         struct nft_trans_elem *te;
9017
9018         if (action == NFNL_ABORT_VALIDATE &&
9019             nf_tables_validate(net) < 0)
9020                 return -EAGAIN;
9021
9022         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9023                                          list) {
9024                 switch (trans->msg_type) {
9025                 case NFT_MSG_NEWTABLE:
9026                         if (nft_trans_table_update(trans)) {
9027                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9028                                         nft_trans_destroy(trans);
9029                                         break;
9030                                 }
9031                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9032                                         nf_tables_table_disable(net, trans->ctx.table);
9033                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9034                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9035                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9036                                 }
9037                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9038                                 nft_trans_destroy(trans);
9039                         } else {
9040                                 list_del_rcu(&trans->ctx.table->list);
9041                         }
9042                         break;
9043                 case NFT_MSG_DELTABLE:
9044                         nft_clear(trans->ctx.net, trans->ctx.table);
9045                         nft_trans_destroy(trans);
9046                         break;
9047                 case NFT_MSG_NEWCHAIN:
9048                         if (nft_trans_chain_update(trans)) {
9049                                 free_percpu(nft_trans_chain_stats(trans));
9050                                 kfree(nft_trans_chain_name(trans));
9051                                 nft_trans_destroy(trans);
9052                         } else {
9053                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9054                                         nft_trans_destroy(trans);
9055                                         break;
9056                                 }
9057                                 trans->ctx.table->use--;
9058                                 nft_chain_del(trans->ctx.chain);
9059                                 nf_tables_unregister_hook(trans->ctx.net,
9060                                                           trans->ctx.table,
9061                                                           trans->ctx.chain);
9062                         }
9063                         break;
9064                 case NFT_MSG_DELCHAIN:
9065                         trans->ctx.table->use++;
9066                         nft_clear(trans->ctx.net, trans->ctx.chain);
9067                         nft_trans_destroy(trans);
9068                         break;
9069                 case NFT_MSG_NEWRULE:
9070                         trans->ctx.chain->use--;
9071                         list_del_rcu(&nft_trans_rule(trans)->list);
9072                         nft_rule_expr_deactivate(&trans->ctx,
9073                                                  nft_trans_rule(trans),
9074                                                  NFT_TRANS_ABORT);
9075                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9076                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9077                         break;
9078                 case NFT_MSG_DELRULE:
9079                         trans->ctx.chain->use++;
9080                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9081                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9082                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9083                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9084
9085                         nft_trans_destroy(trans);
9086                         break;
9087                 case NFT_MSG_NEWSET:
9088                         if (nft_trans_set_update(trans)) {
9089                                 nft_trans_destroy(trans);
9090                                 break;
9091                         }
9092                         trans->ctx.table->use--;
9093                         if (nft_trans_set_bound(trans)) {
9094                                 nft_trans_destroy(trans);
9095                                 break;
9096                         }
9097                         list_del_rcu(&nft_trans_set(trans)->list);
9098                         break;
9099                 case NFT_MSG_DELSET:
9100                         trans->ctx.table->use++;
9101                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9102                         nft_trans_destroy(trans);
9103                         break;
9104                 case NFT_MSG_NEWSETELEM:
9105                         if (nft_trans_elem_set_bound(trans)) {
9106                                 nft_trans_destroy(trans);
9107                                 break;
9108                         }
9109                         te = (struct nft_trans_elem *)trans->data;
9110                         nft_setelem_remove(net, te->set, &te->elem);
9111                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9112                                 atomic_dec(&te->set->nelems);
9113                         break;
9114                 case NFT_MSG_DELSETELEM:
9115                         te = (struct nft_trans_elem *)trans->data;
9116
9117                         nft_setelem_data_activate(net, te->set, &te->elem);
9118                         nft_setelem_activate(net, te->set, &te->elem);
9119                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9120                                 te->set->ndeact--;
9121
9122                         nft_trans_destroy(trans);
9123                         break;
9124                 case NFT_MSG_NEWOBJ:
9125                         if (nft_trans_obj_update(trans)) {
9126                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9127                                 nft_trans_destroy(trans);
9128                         } else {
9129                                 trans->ctx.table->use--;
9130                                 nft_obj_del(nft_trans_obj(trans));
9131                         }
9132                         break;
9133                 case NFT_MSG_DELOBJ:
9134                         trans->ctx.table->use++;
9135                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9136                         nft_trans_destroy(trans);
9137                         break;
9138                 case NFT_MSG_NEWFLOWTABLE:
9139                         if (nft_trans_flowtable_update(trans)) {
9140                                 nft_unregister_flowtable_net_hooks(net,
9141                                                 &nft_trans_flowtable_hooks(trans));
9142                         } else {
9143                                 trans->ctx.table->use--;
9144                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9145                                 nft_unregister_flowtable_net_hooks(net,
9146                                                 &nft_trans_flowtable(trans)->hook_list);
9147                         }
9148                         break;
9149                 case NFT_MSG_DELFLOWTABLE:
9150                         if (nft_trans_flowtable_update(trans)) {
9151                                 list_splice(&nft_trans_flowtable_hooks(trans),
9152                                             &nft_trans_flowtable(trans)->hook_list);
9153                         } else {
9154                                 trans->ctx.table->use++;
9155                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9156                         }
9157                         nft_trans_destroy(trans);
9158                         break;
9159                 }
9160         }
9161
9162         synchronize_rcu();
9163
9164         list_for_each_entry_safe_reverse(trans, next,
9165                                          &nft_net->commit_list, list) {
9166                 list_del(&trans->list);
9167                 nf_tables_abort_release(trans);
9168         }
9169
9170         if (action == NFNL_ABORT_AUTOLOAD)
9171                 nf_tables_module_autoload(net);
9172         else
9173                 nf_tables_module_autoload_cleanup(net);
9174
9175         return 0;
9176 }
9177
9178 static void nf_tables_cleanup(struct net *net)
9179 {
9180         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9181 }
9182
9183 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9184                            enum nfnl_abort_action action)
9185 {
9186         struct nftables_pernet *nft_net = nft_pernet(net);
9187         int ret = __nf_tables_abort(net, action);
9188
9189         mutex_unlock(&nft_net->commit_mutex);
9190
9191         return ret;
9192 }
9193
9194 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9195 {
9196         struct nftables_pernet *nft_net = nft_pernet(net);
9197         bool genid_ok;
9198
9199         mutex_lock(&nft_net->commit_mutex);
9200
9201         genid_ok = genid == 0 || nft_net->base_seq == genid;
9202         if (!genid_ok)
9203                 mutex_unlock(&nft_net->commit_mutex);
9204
9205         /* else, commit mutex has to be released by commit or abort function */
9206         return genid_ok;
9207 }
9208
9209 static const struct nfnetlink_subsystem nf_tables_subsys = {
9210         .name           = "nf_tables",
9211         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9212         .cb_count       = NFT_MSG_MAX,
9213         .cb             = nf_tables_cb,
9214         .commit         = nf_tables_commit,
9215         .abort          = nf_tables_abort,
9216         .cleanup        = nf_tables_cleanup,
9217         .valid_genid    = nf_tables_valid_genid,
9218         .owner          = THIS_MODULE,
9219 };
9220
9221 int nft_chain_validate_dependency(const struct nft_chain *chain,
9222                                   enum nft_chain_types type)
9223 {
9224         const struct nft_base_chain *basechain;
9225
9226         if (nft_is_base_chain(chain)) {
9227                 basechain = nft_base_chain(chain);
9228                 if (basechain->type->type != type)
9229                         return -EOPNOTSUPP;
9230         }
9231         return 0;
9232 }
9233 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9234
9235 int nft_chain_validate_hooks(const struct nft_chain *chain,
9236                              unsigned int hook_flags)
9237 {
9238         struct nft_base_chain *basechain;
9239
9240         if (nft_is_base_chain(chain)) {
9241                 basechain = nft_base_chain(chain);
9242
9243                 if ((1 << basechain->ops.hooknum) & hook_flags)
9244                         return 0;
9245
9246                 return -EOPNOTSUPP;
9247         }
9248
9249         return 0;
9250 }
9251 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9252
9253 /*
9254  * Loop detection - walk through the ruleset beginning at the destination chain
9255  * of a new jump until either the source chain is reached (loop) or all
9256  * reachable chains have been traversed.
9257  *
9258  * The loop check is performed whenever a new jump verdict is added to an
9259  * expression or verdict map or a verdict map is bound to a new chain.
9260  */
9261
9262 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9263                                  const struct nft_chain *chain);
9264
9265 static int nft_check_loops(const struct nft_ctx *ctx,
9266                            const struct nft_set_ext *ext)
9267 {
9268         const struct nft_data *data;
9269         int ret;
9270
9271         data = nft_set_ext_data(ext);
9272         switch (data->verdict.code) {
9273         case NFT_JUMP:
9274         case NFT_GOTO:
9275                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9276                 break;
9277         default:
9278                 ret = 0;
9279                 break;
9280         }
9281
9282         return ret;
9283 }
9284
9285 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9286                                         struct nft_set *set,
9287                                         const struct nft_set_iter *iter,
9288                                         struct nft_set_elem *elem)
9289 {
9290         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9291
9292         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9293             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9294                 return 0;
9295
9296         return nft_check_loops(ctx, ext);
9297 }
9298
9299 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9300                                   struct nft_set *set)
9301 {
9302         u8 genmask = nft_genmask_next(ctx->net);
9303         struct nft_set_elem_catchall *catchall;
9304         struct nft_set_ext *ext;
9305         int ret = 0;
9306
9307         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9308                 ext = nft_set_elem_ext(set, catchall->elem);
9309                 if (!nft_set_elem_active(ext, genmask))
9310                         continue;
9311
9312                 ret = nft_check_loops(ctx, ext);
9313                 if (ret < 0)
9314                         return ret;
9315         }
9316
9317         return ret;
9318 }
9319
9320 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9321                                  const struct nft_chain *chain)
9322 {
9323         const struct nft_rule *rule;
9324         const struct nft_expr *expr, *last;
9325         struct nft_set *set;
9326         struct nft_set_binding *binding;
9327         struct nft_set_iter iter;
9328
9329         if (ctx->chain == chain)
9330                 return -ELOOP;
9331
9332         list_for_each_entry(rule, &chain->rules, list) {
9333                 nft_rule_for_each_expr(expr, last, rule) {
9334                         struct nft_immediate_expr *priv;
9335                         const struct nft_data *data;
9336                         int err;
9337
9338                         if (strcmp(expr->ops->type->name, "immediate"))
9339                                 continue;
9340
9341                         priv = nft_expr_priv(expr);
9342                         if (priv->dreg != NFT_REG_VERDICT)
9343                                 continue;
9344
9345                         data = &priv->data;
9346                         switch (data->verdict.code) {
9347                         case NFT_JUMP:
9348                         case NFT_GOTO:
9349                                 err = nf_tables_check_loops(ctx,
9350                                                         data->verdict.chain);
9351                                 if (err < 0)
9352                                         return err;
9353                                 break;
9354                         default:
9355                                 break;
9356                         }
9357                 }
9358         }
9359
9360         list_for_each_entry(set, &ctx->table->sets, list) {
9361                 if (!nft_is_active_next(ctx->net, set))
9362                         continue;
9363                 if (!(set->flags & NFT_SET_MAP) ||
9364                     set->dtype != NFT_DATA_VERDICT)
9365                         continue;
9366
9367                 list_for_each_entry(binding, &set->bindings, list) {
9368                         if (!(binding->flags & NFT_SET_MAP) ||
9369                             binding->chain != chain)
9370                                 continue;
9371
9372                         iter.genmask    = nft_genmask_next(ctx->net);
9373                         iter.skip       = 0;
9374                         iter.count      = 0;
9375                         iter.err        = 0;
9376                         iter.fn         = nf_tables_loop_check_setelem;
9377
9378                         set->ops->walk(ctx, set, &iter);
9379                         if (!iter.err)
9380                                 iter.err = nft_set_catchall_loops(ctx, set);
9381
9382                         if (iter.err < 0)
9383                                 return iter.err;
9384                 }
9385         }
9386
9387         return 0;
9388 }
9389
9390 /**
9391  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9392  *
9393  *      @attr: netlink attribute to fetch value from
9394  *      @max: maximum value to be stored in dest
9395  *      @dest: pointer to the variable
9396  *
9397  *      Parse, check and store a given u32 netlink attribute into variable.
9398  *      This function returns -ERANGE if the value goes over maximum value.
9399  *      Otherwise a 0 is returned and the attribute value is stored in the
9400  *      destination variable.
9401  */
9402 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9403 {
9404         u32 val;
9405
9406         val = ntohl(nla_get_be32(attr));
9407         if (val > max)
9408                 return -ERANGE;
9409
9410         *dest = val;
9411         return 0;
9412 }
9413 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9414
9415 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9416 {
9417         unsigned int reg;
9418
9419         reg = ntohl(nla_get_be32(attr));
9420         switch (reg) {
9421         case NFT_REG_VERDICT...NFT_REG_4:
9422                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9423                 break;
9424         case NFT_REG32_00...NFT_REG32_15:
9425                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9426                 break;
9427         default:
9428                 return -ERANGE;
9429         }
9430
9431         return 0;
9432 }
9433
9434 /**
9435  *      nft_dump_register - dump a register value to a netlink attribute
9436  *
9437  *      @skb: socket buffer
9438  *      @attr: attribute number
9439  *      @reg: register number
9440  *
9441  *      Construct a netlink attribute containing the register number. For
9442  *      compatibility reasons, register numbers being a multiple of 4 are
9443  *      translated to the corresponding 128 bit register numbers.
9444  */
9445 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9446 {
9447         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9448                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9449         else
9450                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9451
9452         return nla_put_be32(skb, attr, htonl(reg));
9453 }
9454 EXPORT_SYMBOL_GPL(nft_dump_register);
9455
9456 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9457 {
9458         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9459                 return -EINVAL;
9460         if (len == 0)
9461                 return -EINVAL;
9462         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9463                 return -ERANGE;
9464
9465         return 0;
9466 }
9467
9468 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9469 {
9470         u32 reg;
9471         int err;
9472
9473         err = nft_parse_register(attr, &reg);
9474         if (err < 0)
9475                 return err;
9476
9477         err = nft_validate_register_load(reg, len);
9478         if (err < 0)
9479                 return err;
9480
9481         *sreg = reg;
9482         return 0;
9483 }
9484 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9485
9486 static int nft_validate_register_store(const struct nft_ctx *ctx,
9487                                        enum nft_registers reg,
9488                                        const struct nft_data *data,
9489                                        enum nft_data_types type,
9490                                        unsigned int len)
9491 {
9492         int err;
9493
9494         switch (reg) {
9495         case NFT_REG_VERDICT:
9496                 if (type != NFT_DATA_VERDICT)
9497                         return -EINVAL;
9498
9499                 if (data != NULL &&
9500                     (data->verdict.code == NFT_GOTO ||
9501                      data->verdict.code == NFT_JUMP)) {
9502                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9503                         if (err < 0)
9504                                 return err;
9505                 }
9506
9507                 return 0;
9508         default:
9509                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9510                         return -EINVAL;
9511                 if (len == 0)
9512                         return -EINVAL;
9513                 if (reg * NFT_REG32_SIZE + len >
9514                     sizeof_field(struct nft_regs, data))
9515                         return -ERANGE;
9516
9517                 if (data != NULL && type != NFT_DATA_VALUE)
9518                         return -EINVAL;
9519                 return 0;
9520         }
9521 }
9522
9523 int nft_parse_register_store(const struct nft_ctx *ctx,
9524                              const struct nlattr *attr, u8 *dreg,
9525                              const struct nft_data *data,
9526                              enum nft_data_types type, unsigned int len)
9527 {
9528         int err;
9529         u32 reg;
9530
9531         err = nft_parse_register(attr, &reg);
9532         if (err < 0)
9533                 return err;
9534
9535         err = nft_validate_register_store(ctx, reg, data, type, len);
9536         if (err < 0)
9537                 return err;
9538
9539         *dreg = reg;
9540         return 0;
9541 }
9542 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9543
9544 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9545         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9546         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9547                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9548         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9549 };
9550
9551 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9552                             struct nft_data_desc *desc, const struct nlattr *nla)
9553 {
9554         u8 genmask = nft_genmask_next(ctx->net);
9555         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9556         struct nft_chain *chain;
9557         int err;
9558
9559         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9560                                           nft_verdict_policy, NULL);
9561         if (err < 0)
9562                 return err;
9563
9564         if (!tb[NFTA_VERDICT_CODE])
9565                 return -EINVAL;
9566         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9567
9568         switch (data->verdict.code) {
9569         default:
9570                 switch (data->verdict.code & NF_VERDICT_MASK) {
9571                 case NF_ACCEPT:
9572                 case NF_DROP:
9573                 case NF_QUEUE:
9574                         break;
9575                 default:
9576                         return -EINVAL;
9577                 }
9578                 fallthrough;
9579         case NFT_CONTINUE:
9580         case NFT_BREAK:
9581         case NFT_RETURN:
9582                 break;
9583         case NFT_JUMP:
9584         case NFT_GOTO:
9585                 if (tb[NFTA_VERDICT_CHAIN]) {
9586                         chain = nft_chain_lookup(ctx->net, ctx->table,
9587                                                  tb[NFTA_VERDICT_CHAIN],
9588                                                  genmask);
9589                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9590                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
9591                                                       tb[NFTA_VERDICT_CHAIN_ID]);
9592                         if (IS_ERR(chain))
9593                                 return PTR_ERR(chain);
9594                 } else {
9595                         return -EINVAL;
9596                 }
9597
9598                 if (IS_ERR(chain))
9599                         return PTR_ERR(chain);
9600                 if (nft_is_base_chain(chain))
9601                         return -EOPNOTSUPP;
9602                 if (nft_chain_is_bound(chain))
9603                         return -EINVAL;
9604                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
9605                     chain->flags & NFT_CHAIN_BINDING)
9606                         return -EINVAL;
9607
9608                 chain->use++;
9609                 data->verdict.chain = chain;
9610                 break;
9611         }
9612
9613         desc->len = sizeof(data->verdict);
9614
9615         return 0;
9616 }
9617
9618 static void nft_verdict_uninit(const struct nft_data *data)
9619 {
9620         struct nft_chain *chain;
9621         struct nft_rule *rule;
9622
9623         switch (data->verdict.code) {
9624         case NFT_JUMP:
9625         case NFT_GOTO:
9626                 chain = data->verdict.chain;
9627                 chain->use--;
9628
9629                 if (!nft_chain_is_bound(chain))
9630                         break;
9631
9632                 chain->table->use--;
9633                 list_for_each_entry(rule, &chain->rules, list)
9634                         chain->use--;
9635
9636                 nft_chain_del(chain);
9637                 break;
9638         }
9639 }
9640
9641 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9642 {
9643         struct nlattr *nest;
9644
9645         nest = nla_nest_start_noflag(skb, type);
9646         if (!nest)
9647                 goto nla_put_failure;
9648
9649         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9650                 goto nla_put_failure;
9651
9652         switch (v->code) {
9653         case NFT_JUMP:
9654         case NFT_GOTO:
9655                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9656                                    v->chain->name))
9657                         goto nla_put_failure;
9658         }
9659         nla_nest_end(skb, nest);
9660         return 0;
9661
9662 nla_put_failure:
9663         return -1;
9664 }
9665
9666 static int nft_value_init(const struct nft_ctx *ctx,
9667                           struct nft_data *data, struct nft_data_desc *desc,
9668                           const struct nlattr *nla)
9669 {
9670         unsigned int len;
9671
9672         len = nla_len(nla);
9673         if (len == 0)
9674                 return -EINVAL;
9675         if (len > desc->size)
9676                 return -EOVERFLOW;
9677         if (desc->len) {
9678                 if (len != desc->len)
9679                         return -EINVAL;
9680         } else {
9681                 desc->len = len;
9682         }
9683
9684         nla_memcpy(data->data, nla, len);
9685
9686         return 0;
9687 }
9688
9689 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9690                           unsigned int len)
9691 {
9692         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9693 }
9694
9695 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9696         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
9697         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
9698 };
9699
9700 /**
9701  *      nft_data_init - parse nf_tables data netlink attributes
9702  *
9703  *      @ctx: context of the expression using the data
9704  *      @data: destination struct nft_data
9705  *      @desc: data description
9706  *      @nla: netlink attribute containing data
9707  *
9708  *      Parse the netlink data attributes and initialize a struct nft_data.
9709  *      The type and length of data are returned in the data description.
9710  *
9711  *      The caller can indicate that it only wants to accept data of type
9712  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
9713  */
9714 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
9715                   struct nft_data_desc *desc, const struct nlattr *nla)
9716 {
9717         struct nlattr *tb[NFTA_DATA_MAX + 1];
9718         int err;
9719
9720         if (WARN_ON_ONCE(!desc->size))
9721                 return -EINVAL;
9722
9723         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9724                                           nft_data_policy, NULL);
9725         if (err < 0)
9726                 return err;
9727
9728         if (tb[NFTA_DATA_VALUE]) {
9729                 if (desc->type != NFT_DATA_VALUE)
9730                         return -EINVAL;
9731
9732                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
9733         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
9734                 if (desc->type != NFT_DATA_VERDICT)
9735                         return -EINVAL;
9736
9737                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9738         } else {
9739                 err = -EINVAL;
9740         }
9741
9742         return err;
9743 }
9744 EXPORT_SYMBOL_GPL(nft_data_init);
9745
9746 /**
9747  *      nft_data_release - release a nft_data item
9748  *
9749  *      @data: struct nft_data to release
9750  *      @type: type of data
9751  *
9752  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9753  *      all others need to be released by calling this function.
9754  */
9755 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9756 {
9757         if (type < NFT_DATA_VERDICT)
9758                 return;
9759         switch (type) {
9760         case NFT_DATA_VERDICT:
9761                 return nft_verdict_uninit(data);
9762         default:
9763                 WARN_ON(1);
9764         }
9765 }
9766 EXPORT_SYMBOL_GPL(nft_data_release);
9767
9768 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9769                   enum nft_data_types type, unsigned int len)
9770 {
9771         struct nlattr *nest;
9772         int err;
9773
9774         nest = nla_nest_start_noflag(skb, attr);
9775         if (nest == NULL)
9776                 return -1;
9777
9778         switch (type) {
9779         case NFT_DATA_VALUE:
9780                 err = nft_value_dump(skb, data, len);
9781                 break;
9782         case NFT_DATA_VERDICT:
9783                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9784                 break;
9785         default:
9786                 err = -EINVAL;
9787                 WARN_ON(1);
9788         }
9789
9790         nla_nest_end(skb, nest);
9791         return err;
9792 }
9793 EXPORT_SYMBOL_GPL(nft_data_dump);
9794
9795 int __nft_release_basechain(struct nft_ctx *ctx)
9796 {
9797         struct nft_rule *rule, *nr;
9798
9799         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9800                 return 0;
9801
9802         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9803         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9804                 list_del(&rule->list);
9805                 ctx->chain->use--;
9806                 nf_tables_rule_release(ctx, rule);
9807         }
9808         nft_chain_del(ctx->chain);
9809         ctx->table->use--;
9810         nf_tables_chain_destroy(ctx);
9811
9812         return 0;
9813 }
9814 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9815
9816 static void __nft_release_hook(struct net *net, struct nft_table *table)
9817 {
9818         struct nft_flowtable *flowtable;
9819         struct nft_chain *chain;
9820
9821         list_for_each_entry(chain, &table->chains, list)
9822                 __nf_tables_unregister_hook(net, table, chain, true);
9823         list_for_each_entry(flowtable, &table->flowtables, list)
9824                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
9825                                                      true);
9826 }
9827
9828 static void __nft_release_hooks(struct net *net)
9829 {
9830         struct nftables_pernet *nft_net = nft_pernet(net);
9831         struct nft_table *table;
9832
9833         list_for_each_entry(table, &nft_net->tables, list) {
9834                 if (nft_table_has_owner(table))
9835                         continue;
9836
9837                 __nft_release_hook(net, table);
9838         }
9839 }
9840
9841 static void __nft_release_table(struct net *net, struct nft_table *table)
9842 {
9843         struct nft_flowtable *flowtable, *nf;
9844         struct nft_chain *chain, *nc;
9845         struct nft_object *obj, *ne;
9846         struct nft_rule *rule, *nr;
9847         struct nft_set *set, *ns;
9848         struct nft_ctx ctx = {
9849                 .net    = net,
9850                 .family = NFPROTO_NETDEV,
9851         };
9852
9853         ctx.family = table->family;
9854         ctx.table = table;
9855         list_for_each_entry(chain, &table->chains, list) {
9856                 ctx.chain = chain;
9857                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9858                         list_del(&rule->list);
9859                         chain->use--;
9860                         nf_tables_rule_release(&ctx, rule);
9861                 }
9862         }
9863         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9864                 list_del(&flowtable->list);
9865                 table->use--;
9866                 nf_tables_flowtable_destroy(flowtable);
9867         }
9868         list_for_each_entry_safe(set, ns, &table->sets, list) {
9869                 list_del(&set->list);
9870                 table->use--;
9871                 nft_set_destroy(&ctx, set);
9872         }
9873         list_for_each_entry_safe(obj, ne, &table->objects, list) {
9874                 nft_obj_del(obj);
9875                 table->use--;
9876                 nft_obj_destroy(&ctx, obj);
9877         }
9878         list_for_each_entry_safe(chain, nc, &table->chains, list) {
9879                 ctx.chain = chain;
9880                 nft_chain_del(chain);
9881                 table->use--;
9882                 nf_tables_chain_destroy(&ctx);
9883         }
9884         nf_tables_table_destroy(&ctx);
9885 }
9886
9887 static void __nft_release_tables(struct net *net)
9888 {
9889         struct nftables_pernet *nft_net = nft_pernet(net);
9890         struct nft_table *table, *nt;
9891
9892         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9893                 if (nft_table_has_owner(table))
9894                         continue;
9895
9896                 list_del(&table->list);
9897
9898                 __nft_release_table(net, table);
9899         }
9900 }
9901
9902 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9903                             void *ptr)
9904 {
9905         struct nft_table *table, *to_delete[8];
9906         struct nftables_pernet *nft_net;
9907         struct netlink_notify *n = ptr;
9908         struct net *net = n->net;
9909         unsigned int deleted;
9910         bool restart = false;
9911
9912         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9913                 return NOTIFY_DONE;
9914
9915         nft_net = nft_pernet(net);
9916         deleted = 0;
9917         mutex_lock(&nft_net->commit_mutex);
9918         if (!list_empty(&nf_tables_destroy_list))
9919                 rcu_barrier();
9920 again:
9921         list_for_each_entry(table, &nft_net->tables, list) {
9922                 if (nft_table_has_owner(table) &&
9923                     n->portid == table->nlpid) {
9924                         __nft_release_hook(net, table);
9925                         list_del_rcu(&table->list);
9926                         to_delete[deleted++] = table;
9927                         if (deleted >= ARRAY_SIZE(to_delete))
9928                                 break;
9929                 }
9930         }
9931         if (deleted) {
9932                 restart = deleted >= ARRAY_SIZE(to_delete);
9933                 synchronize_rcu();
9934                 while (deleted)
9935                         __nft_release_table(net, to_delete[--deleted]);
9936
9937                 if (restart)
9938                         goto again;
9939         }
9940         mutex_unlock(&nft_net->commit_mutex);
9941
9942         return NOTIFY_DONE;
9943 }
9944
9945 static struct notifier_block nft_nl_notifier = {
9946         .notifier_call  = nft_rcv_nl_event,
9947 };
9948
9949 static int __net_init nf_tables_init_net(struct net *net)
9950 {
9951         struct nftables_pernet *nft_net = nft_pernet(net);
9952
9953         INIT_LIST_HEAD(&nft_net->tables);
9954         INIT_LIST_HEAD(&nft_net->commit_list);
9955         INIT_LIST_HEAD(&nft_net->module_list);
9956         INIT_LIST_HEAD(&nft_net->notify_list);
9957         mutex_init(&nft_net->commit_mutex);
9958         nft_net->base_seq = 1;
9959         nft_net->validate_state = NFT_VALIDATE_SKIP;
9960
9961         return 0;
9962 }
9963
9964 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9965 {
9966         struct nftables_pernet *nft_net = nft_pernet(net);
9967
9968         mutex_lock(&nft_net->commit_mutex);
9969         __nft_release_hooks(net);
9970         mutex_unlock(&nft_net->commit_mutex);
9971 }
9972
9973 static void __net_exit nf_tables_exit_net(struct net *net)
9974 {
9975         struct nftables_pernet *nft_net = nft_pernet(net);
9976
9977         mutex_lock(&nft_net->commit_mutex);
9978         if (!list_empty(&nft_net->commit_list) ||
9979             !list_empty(&nft_net->module_list))
9980                 __nf_tables_abort(net, NFNL_ABORT_NONE);
9981         __nft_release_tables(net);
9982         mutex_unlock(&nft_net->commit_mutex);
9983         WARN_ON_ONCE(!list_empty(&nft_net->tables));
9984         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9985         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9986 }
9987
9988 static struct pernet_operations nf_tables_net_ops = {
9989         .init           = nf_tables_init_net,
9990         .pre_exit       = nf_tables_pre_exit_net,
9991         .exit           = nf_tables_exit_net,
9992         .id             = &nf_tables_net_id,
9993         .size           = sizeof(struct nftables_pernet),
9994 };
9995
9996 static int __init nf_tables_module_init(void)
9997 {
9998         int err;
9999
10000         err = register_pernet_subsys(&nf_tables_net_ops);
10001         if (err < 0)
10002                 return err;
10003
10004         err = nft_chain_filter_init();
10005         if (err < 0)
10006                 goto err_chain_filter;
10007
10008         err = nf_tables_core_module_init();
10009         if (err < 0)
10010                 goto err_core_module;
10011
10012         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10013         if (err < 0)
10014                 goto err_netdev_notifier;
10015
10016         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10017         if (err < 0)
10018                 goto err_rht_objname;
10019
10020         err = nft_offload_init();
10021         if (err < 0)
10022                 goto err_offload;
10023
10024         err = netlink_register_notifier(&nft_nl_notifier);
10025         if (err < 0)
10026                 goto err_netlink_notifier;
10027
10028         /* must be last */
10029         err = nfnetlink_subsys_register(&nf_tables_subsys);
10030         if (err < 0)
10031                 goto err_nfnl_subsys;
10032
10033         nft_chain_route_init();
10034
10035         return err;
10036
10037 err_nfnl_subsys:
10038         netlink_unregister_notifier(&nft_nl_notifier);
10039 err_netlink_notifier:
10040         nft_offload_exit();
10041 err_offload:
10042         rhltable_destroy(&nft_objname_ht);
10043 err_rht_objname:
10044         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10045 err_netdev_notifier:
10046         nf_tables_core_module_exit();
10047 err_core_module:
10048         nft_chain_filter_fini();
10049 err_chain_filter:
10050         unregister_pernet_subsys(&nf_tables_net_ops);
10051         return err;
10052 }
10053
10054 static void __exit nf_tables_module_exit(void)
10055 {
10056         nfnetlink_subsys_unregister(&nf_tables_subsys);
10057         netlink_unregister_notifier(&nft_nl_notifier);
10058         nft_offload_exit();
10059         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10060         nft_chain_filter_fini();
10061         nft_chain_route_fini();
10062         unregister_pernet_subsys(&nf_tables_net_ops);
10063         cancel_work_sync(&trans_destroy_work);
10064         rcu_barrier();
10065         rhltable_destroy(&nft_objname_ht);
10066         nf_tables_core_module_exit();
10067 }
10068
10069 module_init(nf_tables_module_init);
10070 module_exit(nf_tables_module_exit);
10071
10072 MODULE_LICENSE("GPL");
10073 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10074 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);