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 LIST_HEAD(nf_tables_gc_list);
  35 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  36 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
  37
  38 enum {
  39         NFT_VALIDATE_SKIP       = 0,
  40         NFT_VALIDATE_NEED,
  41         NFT_VALIDATE_DO,
  42 };
  43
  44 static struct rhltable nft_objname_ht;
  45
  46 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  47 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  48 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  49
  50 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  51 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  52 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  53
  54 static const struct rhashtable_params nft_chain_ht_params = {
  55         .head_offset            = offsetof(struct nft_chain, rhlhead),
  56         .key_offset             = offsetof(struct nft_chain, name),
  57         .hashfn                 = nft_chain_hash,
  58         .obj_hashfn             = nft_chain_hash_obj,
  59         .obj_cmpfn              = nft_chain_hash_cmp,
  60         .automatic_shrinking    = true,
  61 };
  62
  63 static const struct rhashtable_params nft_objname_ht_params = {
  64         .head_offset            = offsetof(struct nft_object, rhlhead),
  65         .key_offset             = offsetof(struct nft_object, key),
  66         .hashfn                 = nft_objname_hash,
  67         .obj_hashfn             = nft_objname_hash_obj,
  68         .obj_cmpfn              = nft_objname_hash_cmp,
  69         .automatic_shrinking    = true,
  70 };
  71
  72 struct nft_audit_data {
  73         struct nft_table *table;
  74         int entries;
  75         int op;
  76         struct list_head list;
  77 };
  78
  79 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  80         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  81         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  82         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  83         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  84         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  85         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  86         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  87         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  88         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  89         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  90         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  91         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  92         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  93         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  94         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  95         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  96         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  97         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  99         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
 100         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
 101         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 102         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 103         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 104         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 105         [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
 106 };
 107
 108 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 109 {
 110         switch (table->validate_state) {
 111         case NFT_VALIDATE_SKIP:
 112                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 113                 break;
 114         case NFT_VALIDATE_NEED:
 115                 break;
 116         case NFT_VALIDATE_DO:
 117                 if (new_validate_state == NFT_VALIDATE_NEED)
 118                         return;
 119         }
 120
 121         table->validate_state = new_validate_state;
 122 }
 123 static void nf_tables_trans_destroy_work(struct work_struct *w);
 124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 125
 126 static void nft_trans_gc_work(struct work_struct *work);
 127 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
 128
 129 static void nft_ctx_init(struct nft_ctx *ctx,
 130                          struct net *net,
 131                          const struct sk_buff *skb,
 132                          const struct nlmsghdr *nlh,
 133                          u8 family,
 134                          struct nft_table *table,
 135                          struct nft_chain *chain,
 136                          const struct nlattr * const *nla)
 137 {
 138         ctx->net        = net;
 139         ctx->family     = family;
 140         ctx->level      = 0;
 141         ctx->table      = table;
 142         ctx->chain      = chain;
 143         ctx->nla        = nla;
 144         ctx->portid     = NETLINK_CB(skb).portid;
 145         ctx->report     = nlmsg_report(nlh);
 146         ctx->flags      = nlh->nlmsg_flags;
 147         ctx->seq        = nlh->nlmsg_seq;
 148 }
 149
 150 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 151                                              int msg_type, u32 size, gfp_t gfp)
 152 {
 153         struct nft_trans *trans;
 154
 155         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 156         if (trans == NULL)
 157                 return NULL;
 158
 159         INIT_LIST_HEAD(&trans->list);
 160         INIT_LIST_HEAD(&trans->binding_list);
 161         trans->msg_type = msg_type;
 162         trans->ctx      = *ctx;
 163
 164         return trans;
 165 }
 166
 167 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 168                                          int msg_type, u32 size)
 169 {
 170         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 171 }
 172
 173 static void nft_trans_list_del(struct nft_trans *trans)
 174 {
 175         list_del(&trans->list);
 176         list_del(&trans->binding_list);
 177 }
 178
 179 static void nft_trans_destroy(struct nft_trans *trans)
 180 {
 181         nft_trans_list_del(trans);
 182         kfree(trans);
 183 }
 184
 185 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
 186                                  bool bind)
 187 {
 188         struct nftables_pernet *nft_net;
 189         struct net *net = ctx->net;
 190         struct nft_trans *trans;
 191
 192         if (!nft_set_is_anonymous(set))
 193                 return;
 194
 195         nft_net = nft_pernet(net);
 196         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 197                 switch (trans->msg_type) {
 198                 case NFT_MSG_NEWSET:
 199                         if (nft_trans_set(trans) == set)
 200                                 nft_trans_set_bound(trans) = bind;
 201                         break;
 202                 case NFT_MSG_NEWSETELEM:
 203                         if (nft_trans_elem_set(trans) == set)
 204                                 nft_trans_elem_set_bound(trans) = bind;
 205                         break;
 206                 }
 207         }
 208 }
 209
 210 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 211 {
 212         return __nft_set_trans_bind(ctx, set, true);
 213 }
 214
 215 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
 216 {
 217         return __nft_set_trans_bind(ctx, set, false);
 218 }
 219
 220 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
 221                                    struct nft_chain *chain, bool bind)
 222 {
 223         struct nftables_pernet *nft_net;
 224         struct net *net = ctx->net;
 225         struct nft_trans *trans;
 226
 227         if (!nft_chain_binding(chain))
 228                 return;
 229
 230         nft_net = nft_pernet(net);
 231         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 232                 switch (trans->msg_type) {
 233                 case NFT_MSG_NEWCHAIN:
 234                         if (nft_trans_chain(trans) == chain)
 235                                 nft_trans_chain_bound(trans) = bind;
 236                         break;
 237                 case NFT_MSG_NEWRULE:
 238                         if (trans->ctx.chain == chain)
 239                                 nft_trans_rule_bound(trans) = bind;
 240                         break;
 241                 }
 242         }
 243 }
 244
 245 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
 246                                  struct nft_chain *chain)
 247 {
 248         __nft_chain_trans_bind(ctx, chain, true);
 249 }
 250
 251 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 252 {
 253         if (!nft_chain_binding(chain))
 254                 return 0;
 255
 256         if (nft_chain_binding(ctx->chain))
 257                 return -EOPNOTSUPP;
 258
 259         if (chain->bound)
 260                 return -EBUSY;
 261
 262         if (!nft_use_inc(&chain->use))
 263                 return -EMFILE;
 264
 265         chain->bound = true;
 266         nft_chain_trans_bind(ctx, chain);
 267
 268         return 0;
 269 }
 270
 271 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 272 {
 273         __nft_chain_trans_bind(ctx, chain, false);
 274 }
 275
 276 static int nft_netdev_register_hooks(struct net *net,
 277                                      struct list_head *hook_list)
 278 {
 279         struct nft_hook *hook;
 280         int err, j;
 281
 282         j = 0;
 283         list_for_each_entry(hook, hook_list, list) {
 284                 err = nf_register_net_hook(net, &hook->ops);
 285                 if (err < 0)
 286                         goto err_register;
 287
 288                 j++;
 289         }
 290         return 0;
 291
 292 err_register:
 293         list_for_each_entry(hook, hook_list, list) {
 294                 if (j-- <= 0)
 295                         break;
 296
 297                 nf_unregister_net_hook(net, &hook->ops);
 298         }
 299         return err;
 300 }
 301
 302 static void nft_netdev_unregister_hooks(struct net *net,
 303                                         struct list_head *hook_list,
 304                                         bool release_netdev)
 305 {
 306         struct nft_hook *hook, *next;
 307
 308         list_for_each_entry_safe(hook, next, hook_list, list) {
 309                 nf_unregister_net_hook(net, &hook->ops);
 310                 if (release_netdev) {
 311                         list_del(&hook->list);
 312                         kfree_rcu(hook, rcu);
 313                 }
 314         }
 315 }
 316
 317 static int nf_tables_register_hook(struct net *net,
 318                                    const struct nft_table *table,
 319                                    struct nft_chain *chain)
 320 {
 321         struct nft_base_chain *basechain;
 322         const struct nf_hook_ops *ops;
 323
 324         if (table->flags & NFT_TABLE_F_DORMANT ||
 325             !nft_is_base_chain(chain))
 326                 return 0;
 327
 328         basechain = nft_base_chain(chain);
 329         ops = &basechain->ops;
 330
 331         if (basechain->type->ops_register)
 332                 return basechain->type->ops_register(net, ops);
 333
 334         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 335                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 336
 337         return nf_register_net_hook(net, &basechain->ops);
 338 }
 339
 340 static void __nf_tables_unregister_hook(struct net *net,
 341                                         const struct nft_table *table,
 342                                         struct nft_chain *chain,
 343                                         bool release_netdev)
 344 {
 345         struct nft_base_chain *basechain;
 346         const struct nf_hook_ops *ops;
 347
 348         if (table->flags & NFT_TABLE_F_DORMANT ||
 349             !nft_is_base_chain(chain))
 350                 return;
 351         basechain = nft_base_chain(chain);
 352         ops = &basechain->ops;
 353
 354         if (basechain->type->ops_unregister)
 355                 return basechain->type->ops_unregister(net, ops);
 356
 357         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 358                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 359                                             release_netdev);
 360         else
 361                 nf_unregister_net_hook(net, &basechain->ops);
 362 }
 363
 364 static void nf_tables_unregister_hook(struct net *net,
 365                                       const struct nft_table *table,
 366                                       struct nft_chain *chain)
 367 {
 368         return __nf_tables_unregister_hook(net, table, chain, false);
 369 }
 370
 371 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 372 {
 373         struct nftables_pernet *nft_net = nft_pernet(net);
 374
 375         switch (trans->msg_type) {
 376         case NFT_MSG_NEWSET:
 377                 if (!nft_trans_set_update(trans) &&
 378                     nft_set_is_anonymous(nft_trans_set(trans)))
 379                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 380                 break;
 381         case NFT_MSG_NEWCHAIN:
 382                 if (!nft_trans_chain_update(trans) &&
 383                     nft_chain_binding(nft_trans_chain(trans)))
 384                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 385                 break;
 386         }
 387
 388         list_add_tail(&trans->list, &nft_net->commit_list);
 389 }
 390
 391 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 392 {
 393         struct nft_trans *trans;
 394
 395         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 396         if (trans == NULL)
 397                 return -ENOMEM;
 398
 399         if (msg_type == NFT_MSG_NEWTABLE)
 400                 nft_activate_next(ctx->net, ctx->table);
 401
 402         nft_trans_commit_list_add_tail(ctx->net, trans);
 403         return 0;
 404 }
 405
 406 static int nft_deltable(struct nft_ctx *ctx)
 407 {
 408         int err;
 409
 410         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 411         if (err < 0)
 412                 return err;
 413
 414         nft_deactivate_next(ctx->net, ctx->table);
 415         return err;
 416 }
 417
 418 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 419 {
 420         struct nft_trans *trans;
 421
 422         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 423         if (trans == NULL)
 424                 return ERR_PTR(-ENOMEM);
 425
 426         if (msg_type == NFT_MSG_NEWCHAIN) {
 427                 nft_activate_next(ctx->net, ctx->chain);
 428
 429                 if (ctx->nla[NFTA_CHAIN_ID]) {
 430                         nft_trans_chain_id(trans) =
 431                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 432                 }
 433         }
 434         nft_trans_chain(trans) = ctx->chain;
 435         nft_trans_commit_list_add_tail(ctx->net, trans);
 436
 437         return trans;
 438 }
 439
 440 static int nft_delchain(struct nft_ctx *ctx)
 441 {
 442         struct nft_trans *trans;
 443
 444         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 445         if (IS_ERR(trans))
 446                 return PTR_ERR(trans);
 447
 448         nft_use_dec(&ctx->table->use);
 449         nft_deactivate_next(ctx->net, ctx->chain);
 450
 451         return 0;
 452 }
 453
 454 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
 455 {
 456         struct nft_expr *expr;
 457
 458         expr = nft_expr_first(rule);
 459         while (nft_expr_more(rule, expr)) {
 460                 if (expr->ops->activate)
 461                         expr->ops->activate(ctx, expr);
 462
 463                 expr = nft_expr_next(expr);
 464         }
 465 }
 466
 467 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
 468                               enum nft_trans_phase phase)
 469 {
 470         struct nft_expr *expr;
 471
 472         expr = nft_expr_first(rule);
 473         while (nft_expr_more(rule, expr)) {
 474                 if (expr->ops->deactivate)
 475                         expr->ops->deactivate(ctx, expr, phase);
 476
 477                 expr = nft_expr_next(expr);
 478         }
 479 }
 480
 481 static int
 482 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 483 {
 484         /* You cannot delete the same rule twice */
 485         if (nft_is_active_next(ctx->net, rule)) {
 486                 nft_deactivate_next(ctx->net, rule);
 487                 nft_use_dec(&ctx->chain->use);
 488                 return 0;
 489         }
 490         return -ENOENT;
 491 }
 492
 493 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 494                                             struct nft_rule *rule)
 495 {
 496         struct nft_trans *trans;
 497
 498         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 499         if (trans == NULL)
 500                 return NULL;
 501
 502         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 503                 nft_trans_rule_id(trans) =
 504                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 505         }
 506         nft_trans_rule(trans) = rule;
 507         nft_trans_commit_list_add_tail(ctx->net, trans);
 508
 509         return trans;
 510 }
 511
 512 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 513 {
 514         struct nft_flow_rule *flow;
 515         struct nft_trans *trans;
 516         int err;
 517
 518         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 519         if (trans == NULL)
 520                 return -ENOMEM;
 521
 522         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 523                 flow = nft_flow_rule_create(ctx->net, rule);
 524                 if (IS_ERR(flow)) {
 525                         nft_trans_destroy(trans);
 526                         return PTR_ERR(flow);
 527                 }
 528
 529                 nft_trans_flow_rule(trans) = flow;
 530         }
 531
 532         err = nf_tables_delrule_deactivate(ctx, rule);
 533         if (err < 0) {
 534                 nft_trans_destroy(trans);
 535                 return err;
 536         }
 537         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 538
 539         return 0;
 540 }
 541
 542 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 543 {
 544         struct nft_rule *rule;
 545         int err;
 546
 547         list_for_each_entry(rule, &ctx->chain->rules, list) {
 548                 if (!nft_is_active_next(ctx->net, rule))
 549                         continue;
 550
 551                 err = nft_delrule(ctx, rule);
 552                 if (err < 0)
 553                         return err;
 554         }
 555         return 0;
 556 }
 557
 558 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 559                                struct nft_set *set,
 560                                const struct nft_set_desc *desc)
 561 {
 562         struct nft_trans *trans;
 563
 564         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 565         if (trans == NULL)
 566                 return -ENOMEM;
 567
 568         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 569                 nft_trans_set_id(trans) =
 570                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 571                 nft_activate_next(ctx->net, set);
 572         }
 573         nft_trans_set(trans) = set;
 574         if (desc) {
 575                 nft_trans_set_update(trans) = true;
 576                 nft_trans_set_gc_int(trans) = desc->gc_int;
 577                 nft_trans_set_timeout(trans) = desc->timeout;
 578                 nft_trans_set_size(trans) = desc->size;
 579         }
 580         nft_trans_commit_list_add_tail(ctx->net, trans);
 581
 582         return 0;
 583 }
 584
 585 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 586                              struct nft_set *set)
 587 {
 588         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 589 }
 590
 591 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
 592                                   struct nft_set *set,
 593                                   const struct nft_set_iter *iter,
 594                                   struct nft_set_elem *elem)
 595 {
 596         nft_setelem_data_deactivate(ctx->net, set, elem);
 597
 598         return 0;
 599 }
 600
 601 struct nft_set_elem_catchall {
 602         struct list_head        list;
 603         struct rcu_head         rcu;
 604         void                    *elem;
 605 };
 606
 607 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
 608                                         struct nft_set *set)
 609 {
 610         u8 genmask = nft_genmask_next(ctx->net);
 611         struct nft_set_elem_catchall *catchall;
 612         struct nft_set_elem elem;
 613         struct nft_set_ext *ext;
 614
 615         list_for_each_entry(catchall, &set->catchall_list, list) {
 616                 ext = nft_set_elem_ext(set, catchall->elem);
 617                 if (!nft_set_elem_active(ext, genmask))
 618                         continue;
 619
 620                 elem.priv = catchall->elem;
 621                 nft_setelem_data_deactivate(ctx->net, set, &elem);
 622                 break;
 623         }
 624 }
 625
 626 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
 627 {
 628         struct nft_set_iter iter = {
 629                 .genmask        = nft_genmask_next(ctx->net),
 630                 .fn             = nft_mapelem_deactivate,
 631         };
 632
 633         set->ops->walk(ctx, set, &iter);
 634         WARN_ON_ONCE(iter.err);
 635
 636         nft_map_catchall_deactivate(ctx, set);
 637 }
 638
 639 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 640 {
 641         int err;
 642
 643         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 644         if (err < 0)
 645                 return err;
 646
 647         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
 648                 nft_map_deactivate(ctx, set);
 649
 650         nft_deactivate_next(ctx->net, set);
 651         nft_use_dec(&ctx->table->use);
 652
 653         return err;
 654 }
 655
 656 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 657                              struct nft_object *obj)
 658 {
 659         struct nft_trans *trans;
 660
 661         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 662         if (trans == NULL)
 663                 return -ENOMEM;
 664
 665         if (msg_type == NFT_MSG_NEWOBJ)
 666                 nft_activate_next(ctx->net, obj);
 667
 668         nft_trans_obj(trans) = obj;
 669         nft_trans_commit_list_add_tail(ctx->net, trans);
 670
 671         return 0;
 672 }
 673
 674 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 675 {
 676         int err;
 677
 678         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 679         if (err < 0)
 680                 return err;
 681
 682         nft_deactivate_next(ctx->net, obj);
 683         nft_use_dec(&ctx->table->use);
 684
 685         return err;
 686 }
 687
 688 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 689                                    struct nft_flowtable *flowtable)
 690 {
 691         struct nft_trans *trans;
 692
 693         trans = nft_trans_alloc(ctx, msg_type,
 694                                 sizeof(struct nft_trans_flowtable));
 695         if (trans == NULL)
 696                 return -ENOMEM;
 697
 698         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 699                 nft_activate_next(ctx->net, flowtable);
 700
 701         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 702         nft_trans_flowtable(trans) = flowtable;
 703         nft_trans_commit_list_add_tail(ctx->net, trans);
 704
 705         return 0;
 706 }
 707
 708 static int nft_delflowtable(struct nft_ctx *ctx,
 709                             struct nft_flowtable *flowtable)
 710 {
 711         int err;
 712
 713         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 714         if (err < 0)
 715                 return err;
 716
 717         nft_deactivate_next(ctx->net, flowtable);
 718         nft_use_dec(&ctx->table->use);
 719
 720         return err;
 721 }
 722
 723 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 724 {
 725         int i;
 726
 727         for (i = track->regs[dreg].num_reg; i > 0; i--)
 728                 __nft_reg_track_cancel(track, dreg - i);
 729 }
 730
 731 static void __nft_reg_track_update(struct nft_regs_track *track,
 732                                    const struct nft_expr *expr,
 733                                    u8 dreg, u8 num_reg)
 734 {
 735         track->regs[dreg].selector = expr;
 736         track->regs[dreg].bitwise = NULL;
 737         track->regs[dreg].num_reg = num_reg;
 738 }
 739
 740 void nft_reg_track_update(struct nft_regs_track *track,
 741                           const struct nft_expr *expr, u8 dreg, u8 len)
 742 {
 743         unsigned int regcount;
 744         int i;
 745
 746         __nft_reg_track_clobber(track, dreg);
 747
 748         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 749         for (i = 0; i < regcount; i++, dreg++)
 750                 __nft_reg_track_update(track, expr, dreg, i);
 751 }
 752 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 753
 754 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 755 {
 756         unsigned int regcount;
 757         int i;
 758
 759         __nft_reg_track_clobber(track, dreg);
 760
 761         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 762         for (i = 0; i < regcount; i++, dreg++)
 763                 __nft_reg_track_cancel(track, dreg);
 764 }
 765 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 766
 767 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 768 {
 769         track->regs[dreg].selector = NULL;
 770         track->regs[dreg].bitwise = NULL;
 771         track->regs[dreg].num_reg = 0;
 772 }
 773 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 774
 775 /*
 776  * Tables
 777  */
 778
 779 static struct nft_table *nft_table_lookup(const struct net *net,
 780                                           const struct nlattr *nla,
 781                                           u8 family, u8 genmask, u32 nlpid)
 782 {
 783         struct nftables_pernet *nft_net;
 784         struct nft_table *table;
 785
 786         if (nla == NULL)
 787                 return ERR_PTR(-EINVAL);
 788
 789         nft_net = nft_pernet(net);
 790         list_for_each_entry_rcu(table, &nft_net->tables, list,
 791                                 lockdep_is_held(&nft_net->commit_mutex)) {
 792                 if (!nla_strcmp(nla, table->name) &&
 793                     table->family == family &&
 794                     nft_active_genmask(table, genmask)) {
 795                         if (nft_table_has_owner(table) &&
 796                             nlpid && table->nlpid != nlpid)
 797                                 return ERR_PTR(-EPERM);
 798
 799                         return table;
 800                 }
 801         }
 802
 803         return ERR_PTR(-ENOENT);
 804 }
 805
 806 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 807                                                    const struct nlattr *nla,
 808                                                    u8 genmask, u32 nlpid)
 809 {
 810         struct nftables_pernet *nft_net;
 811         struct nft_table *table;
 812
 813         nft_net = nft_pernet(net);
 814         list_for_each_entry(table, &nft_net->tables, list) {
 815                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 816                     nft_active_genmask(table, genmask)) {
 817                         if (nft_table_has_owner(table) &&
 818                             nlpid && table->nlpid != nlpid)
 819                                 return ERR_PTR(-EPERM);
 820
 821                         return table;
 822                 }
 823         }
 824
 825         return ERR_PTR(-ENOENT);
 826 }
 827
 828 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 829 {
 830         return ++table->hgenerator;
 831 }
 832
 833 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 834
 835 static const struct nft_chain_type *
 836 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 837 {
 838         if (family >= NFPROTO_NUMPROTO ||
 839             type >= NFT_CHAIN_T_MAX)
 840                 return NULL;
 841
 842         return chain_type[family][type];
 843 }
 844
 845 static const struct nft_chain_type *
 846 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 847 {
 848         const struct nft_chain_type *type;
 849         int i;
 850
 851         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 852                 type = __nft_chain_type_get(family, i);
 853                 if (!type)
 854                         continue;
 855                 if (!nla_strcmp(nla, type->name))
 856                         return type;
 857         }
 858         return NULL;
 859 }
 860
 861 struct nft_module_request {
 862         struct list_head        list;
 863         char                    module[MODULE_NAME_LEN];
 864         bool                    done;
 865 };
 866
 867 #ifdef CONFIG_MODULES
 868 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 869                                       ...)
 870 {
 871         char module_name[MODULE_NAME_LEN];
 872         struct nftables_pernet *nft_net;
 873         struct nft_module_request *req;
 874         va_list args;
 875         int ret;
 876
 877         va_start(args, fmt);
 878         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 879         va_end(args);
 880         if (ret >= MODULE_NAME_LEN)
 881                 return 0;
 882
 883         nft_net = nft_pernet(net);
 884         list_for_each_entry(req, &nft_net->module_list, list) {
 885                 if (!strcmp(req->module, module_name)) {
 886                         if (req->done)
 887                                 return 0;
 888
 889                         /* A request to load this module already exists. */
 890                         return -EAGAIN;
 891                 }
 892         }
 893
 894         req = kmalloc(sizeof(*req), GFP_KERNEL);
 895         if (!req)
 896                 return -ENOMEM;
 897
 898         req->done = false;
 899         strscpy(req->module, module_name, MODULE_NAME_LEN);
 900         list_add_tail(&req->list, &nft_net->module_list);
 901
 902         return -EAGAIN;
 903 }
 904 EXPORT_SYMBOL_GPL(nft_request_module);
 905 #endif
 906
 907 static void lockdep_nfnl_nft_mutex_not_held(void)
 908 {
 909 #ifdef CONFIG_PROVE_LOCKING
 910         if (debug_locks)
 911                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 912 #endif
 913 }
 914
 915 static const struct nft_chain_type *
 916 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 917                             u8 family, bool autoload)
 918 {
 919         const struct nft_chain_type *type;
 920
 921         type = __nf_tables_chain_type_lookup(nla, family);
 922         if (type != NULL)
 923                 return type;
 924
 925         lockdep_nfnl_nft_mutex_not_held();
 926 #ifdef CONFIG_MODULES
 927         if (autoload) {
 928                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 929                                        nla_len(nla),
 930                                        (const char *)nla_data(nla)) == -EAGAIN)
 931                         return ERR_PTR(-EAGAIN);
 932         }
 933 #endif
 934         return ERR_PTR(-ENOENT);
 935 }
 936
 937 static __be16 nft_base_seq(const struct net *net)
 938 {
 939         struct nftables_pernet *nft_net = nft_pernet(net);
 940
 941         return htons(nft_net->base_seq & 0xffff);
 942 }
 943
 944 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 945         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 946                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 947         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 948         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 949         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 950                                     .len = NFT_USERDATA_MAXLEN }
 951 };
 952
 953 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 954                                      u32 portid, u32 seq, int event, u32 flags,
 955                                      int family, const struct nft_table *table)
 956 {
 957         struct nlmsghdr *nlh;
 958
 959         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 960         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 961                            NFNETLINK_V0, nft_base_seq(net));
 962         if (!nlh)
 963                 goto nla_put_failure;
 964
 965         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 966             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 967             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 968                          NFTA_TABLE_PAD))
 969                 goto nla_put_failure;
 970
 971         if (event == NFT_MSG_DELTABLE) {
 972                 nlmsg_end(skb, nlh);
 973                 return 0;
 974         }
 975
 976         if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
 977                          htonl(table->flags & NFT_TABLE_F_MASK)))
 978                 goto nla_put_failure;
 979
 980         if (nft_table_has_owner(table) &&
 981             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 982                 goto nla_put_failure;
 983
 984         if (table->udata) {
 985                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 986                         goto nla_put_failure;
 987         }
 988
 989         nlmsg_end(skb, nlh);
 990         return 0;
 991
 992 nla_put_failure:
 993         nlmsg_trim(skb, nlh);
 994         return -1;
 995 }
 996
 997 struct nftnl_skb_parms {
 998         bool report;
 999 };
1000 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
1001
1002 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1003                                struct list_head *notify_list)
1004 {
1005         NFT_CB(skb).report = report;
1006         list_add_tail(&skb->list, notify_list);
1007 }
1008
1009 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1010 {
1011         struct nftables_pernet *nft_net;
1012         struct sk_buff *skb;
1013         u16 flags = 0;
1014         int err;
1015
1016         if (!ctx->report &&
1017             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1018                 return;
1019
1020         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1021         if (skb == NULL)
1022                 goto err;
1023
1024         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1025                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1026
1027         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1028                                         event, flags, ctx->family, ctx->table);
1029         if (err < 0) {
1030                 kfree_skb(skb);
1031                 goto err;
1032         }
1033
1034         nft_net = nft_pernet(ctx->net);
1035         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1036         return;
1037 err:
1038         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1039 }
1040
1041 static int nf_tables_dump_tables(struct sk_buff *skb,
1042                                  struct netlink_callback *cb)
1043 {
1044         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1045         struct nftables_pernet *nft_net;
1046         const struct nft_table *table;
1047         unsigned int idx = 0, s_idx = cb->args[0];
1048         struct net *net = sock_net(skb->sk);
1049         int family = nfmsg->nfgen_family;
1050
1051         rcu_read_lock();
1052         nft_net = nft_pernet(net);
1053         cb->seq = READ_ONCE(nft_net->base_seq);
1054
1055         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1056                 if (family != NFPROTO_UNSPEC && family != table->family)
1057                         continue;
1058
1059                 if (idx < s_idx)
1060                         goto cont;
1061                 if (idx > s_idx)
1062                         memset(&cb->args[1], 0,
1063                                sizeof(cb->args) - sizeof(cb->args[0]));
1064                 if (!nft_is_active(net, table))
1065                         continue;
1066                 if (nf_tables_fill_table_info(skb, net,
1067                                               NETLINK_CB(cb->skb).portid,
1068                                               cb->nlh->nlmsg_seq,
1069                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
1070                                               table->family, table) < 0)
1071                         goto done;
1072
1073                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1074 cont:
1075                 idx++;
1076         }
1077 done:
1078         rcu_read_unlock();
1079         cb->args[0] = idx;
1080         return skb->len;
1081 }
1082
1083 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1084                                       const struct nlmsghdr *nlh,
1085                                       struct netlink_dump_control *c)
1086 {
1087         int err;
1088
1089         if (!try_module_get(THIS_MODULE))
1090                 return -EINVAL;
1091
1092         rcu_read_unlock();
1093         err = netlink_dump_start(nlsk, skb, nlh, c);
1094         rcu_read_lock();
1095         module_put(THIS_MODULE);
1096
1097         return err;
1098 }
1099
1100 /* called with rcu_read_lock held */
1101 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1102                               const struct nlattr * const nla[])
1103 {
1104         struct netlink_ext_ack *extack = info->extack;
1105         u8 genmask = nft_genmask_cur(info->net);
1106         u8 family = info->nfmsg->nfgen_family;
1107         const struct nft_table *table;
1108         struct net *net = info->net;
1109         struct sk_buff *skb2;
1110         int err;
1111
1112         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1113                 struct netlink_dump_control c = {
1114                         .dump = nf_tables_dump_tables,
1115                         .module = THIS_MODULE,
1116                 };
1117
1118                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1119         }
1120
1121         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1122         if (IS_ERR(table)) {
1123                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1124                 return PTR_ERR(table);
1125         }
1126
1127         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1128         if (!skb2)
1129                 return -ENOMEM;
1130
1131         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1132                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1133                                         0, family, table);
1134         if (err < 0)
1135                 goto err_fill_table_info;
1136
1137         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1138
1139 err_fill_table_info:
1140         kfree_skb(skb2);
1141         return err;
1142 }
1143
1144 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1145 {
1146         struct nft_chain *chain;
1147         u32 i = 0;
1148
1149         list_for_each_entry(chain, &table->chains, list) {
1150                 if (!nft_is_active_next(net, chain))
1151                         continue;
1152                 if (!nft_is_base_chain(chain))
1153                         continue;
1154
1155                 if (cnt && i++ == cnt)
1156                         break;
1157
1158                 nf_tables_unregister_hook(net, table, chain);
1159         }
1160 }
1161
1162 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1163 {
1164         struct nft_chain *chain;
1165         int err, i = 0;
1166
1167         list_for_each_entry(chain, &table->chains, list) {
1168                 if (!nft_is_active_next(net, chain))
1169                         continue;
1170                 if (!nft_is_base_chain(chain))
1171                         continue;
1172
1173                 err = nf_tables_register_hook(net, table, chain);
1174                 if (err < 0)
1175                         goto err_register_hooks;
1176
1177                 i++;
1178         }
1179         return 0;
1180
1181 err_register_hooks:
1182         if (i)
1183                 nft_table_disable(net, table, i);
1184         return err;
1185 }
1186
1187 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1188 {
1189         table->flags &= ~NFT_TABLE_F_DORMANT;
1190         nft_table_disable(net, table, 0);
1191         table->flags |= NFT_TABLE_F_DORMANT;
1192 }
1193
1194 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1195 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1196 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1197 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1198                                          __NFT_TABLE_F_WAS_AWAKEN)
1199
1200 static int nf_tables_updtable(struct nft_ctx *ctx)
1201 {
1202         struct nft_trans *trans;
1203         u32 flags;
1204         int ret;
1205
1206         if (!ctx->nla[NFTA_TABLE_FLAGS])
1207                 return 0;
1208
1209         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1210         if (flags & ~NFT_TABLE_F_MASK)
1211                 return -EOPNOTSUPP;
1212
1213         if (flags == ctx->table->flags)
1214                 return 0;
1215
1216         if ((nft_table_has_owner(ctx->table) &&
1217              !(flags & NFT_TABLE_F_OWNER)) ||
1218             (!nft_table_has_owner(ctx->table) &&
1219              flags & NFT_TABLE_F_OWNER))
1220                 return -EOPNOTSUPP;
1221
1222         /* No dormant off/on/off/on games in single transaction */
1223         if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1224                 return -EINVAL;
1225
1226         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1227                                 sizeof(struct nft_trans_table));
1228         if (trans == NULL)
1229                 return -ENOMEM;
1230
1231         if ((flags & NFT_TABLE_F_DORMANT) &&
1232             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1233                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1234                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1235                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1236         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1237                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1238                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1239                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1240                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1241                         if (ret < 0)
1242                                 goto err_register_hooks;
1243
1244                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1245                 }
1246         }
1247
1248         nft_trans_table_update(trans) = true;
1249         nft_trans_commit_list_add_tail(ctx->net, trans);
1250
1251         return 0;
1252
1253 err_register_hooks:
1254         nft_trans_destroy(trans);
1255         return ret;
1256 }
1257
1258 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1259 {
1260         const char *name = data;
1261
1262         return jhash(name, strlen(name), seed);
1263 }
1264
1265 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1266 {
1267         const struct nft_chain *chain = data;
1268
1269         return nft_chain_hash(chain->name, 0, seed);
1270 }
1271
1272 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1273                               const void *ptr)
1274 {
1275         const struct nft_chain *chain = ptr;
1276         const char *name = arg->key;
1277
1278         return strcmp(chain->name, name);
1279 }
1280
1281 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1282 {
1283         const struct nft_object_hash_key *k = data;
1284
1285         seed ^= hash_ptr(k->table, 32);
1286
1287         return jhash(k->name, strlen(k->name), seed);
1288 }
1289
1290 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1291 {
1292         const struct nft_object *obj = data;
1293
1294         return nft_objname_hash(&obj->key, 0, seed);
1295 }
1296
1297 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1298                                 const void *ptr)
1299 {
1300         const struct nft_object_hash_key *k = arg->key;
1301         const struct nft_object *obj = ptr;
1302
1303         if (obj->key.table != k->table)
1304                 return -1;
1305
1306         return strcmp(obj->key.name, k->name);
1307 }
1308
1309 static bool nft_supported_family(u8 family)
1310 {
1311         return false
1312 #ifdef CONFIG_NF_TABLES_INET
1313                 || family == NFPROTO_INET
1314 #endif
1315 #ifdef CONFIG_NF_TABLES_IPV4
1316                 || family == NFPROTO_IPV4
1317 #endif
1318 #ifdef CONFIG_NF_TABLES_ARP
1319                 || family == NFPROTO_ARP
1320 #endif
1321 #ifdef CONFIG_NF_TABLES_NETDEV
1322                 || family == NFPROTO_NETDEV
1323 #endif
1324 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1325                 || family == NFPROTO_BRIDGE
1326 #endif
1327 #ifdef CONFIG_NF_TABLES_IPV6
1328                 || family == NFPROTO_IPV6
1329 #endif
1330                 ;
1331 }
1332
1333 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1334                               const struct nlattr * const nla[])
1335 {
1336         struct nftables_pernet *nft_net = nft_pernet(info->net);
1337         struct netlink_ext_ack *extack = info->extack;
1338         u8 genmask = nft_genmask_next(info->net);
1339         u8 family = info->nfmsg->nfgen_family;
1340         struct net *net = info->net;
1341         const struct nlattr *attr;
1342         struct nft_table *table;
1343         struct nft_ctx ctx;
1344         u32 flags = 0;
1345         int err;
1346
1347         if (!nft_supported_family(family))
1348                 return -EOPNOTSUPP;
1349
1350         lockdep_assert_held(&nft_net->commit_mutex);
1351         attr = nla[NFTA_TABLE_NAME];
1352         table = nft_table_lookup(net, attr, family, genmask,
1353                                  NETLINK_CB(skb).portid);
1354         if (IS_ERR(table)) {
1355                 if (PTR_ERR(table) != -ENOENT)
1356                         return PTR_ERR(table);
1357         } else {
1358                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1359                         NL_SET_BAD_ATTR(extack, attr);
1360                         return -EEXIST;
1361                 }
1362                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1363                         return -EOPNOTSUPP;
1364
1365                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1366
1367                 return nf_tables_updtable(&ctx);
1368         }
1369
1370         if (nla[NFTA_TABLE_FLAGS]) {
1371                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1372                 if (flags & ~NFT_TABLE_F_MASK)
1373                         return -EOPNOTSUPP;
1374         }
1375
1376         err = -ENOMEM;
1377         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1378         if (table == NULL)
1379                 goto err_kzalloc;
1380
1381         table->validate_state = nft_net->validate_state;
1382         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1383         if (table->name == NULL)
1384                 goto err_strdup;
1385
1386         if (nla[NFTA_TABLE_USERDATA]) {
1387                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1388                 if (table->udata == NULL)
1389                         goto err_table_udata;
1390
1391                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1392         }
1393
1394         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1395         if (err)
1396                 goto err_chain_ht;
1397
1398         INIT_LIST_HEAD(&table->chains);
1399         INIT_LIST_HEAD(&table->sets);
1400         INIT_LIST_HEAD(&table->objects);
1401         INIT_LIST_HEAD(&table->flowtables);
1402         table->family = family;
1403         table->flags = flags;
1404         table->handle = ++nft_net->table_handle;
1405         if (table->flags & NFT_TABLE_F_OWNER)
1406                 table->nlpid = NETLINK_CB(skb).portid;
1407
1408         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1409         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1410         if (err < 0)
1411                 goto err_trans;
1412
1413         list_add_tail_rcu(&table->list, &nft_net->tables);
1414         return 0;
1415 err_trans:
1416         rhltable_destroy(&table->chains_ht);
1417 err_chain_ht:
1418         kfree(table->udata);
1419 err_table_udata:
1420         kfree(table->name);
1421 err_strdup:
1422         kfree(table);
1423 err_kzalloc:
1424         return err;
1425 }
1426
1427 static int nft_flush_table(struct nft_ctx *ctx)
1428 {
1429         struct nft_flowtable *flowtable, *nft;
1430         struct nft_chain *chain, *nc;
1431         struct nft_object *obj, *ne;
1432         struct nft_set *set, *ns;
1433         int err;
1434
1435         list_for_each_entry(chain, &ctx->table->chains, list) {
1436                 if (!nft_is_active_next(ctx->net, chain))
1437                         continue;
1438
1439                 if (nft_chain_binding(chain))
1440                         continue;
1441
1442                 ctx->chain = chain;
1443
1444                 err = nft_delrule_by_chain(ctx);
1445                 if (err < 0)
1446                         goto out;
1447         }
1448
1449         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1450                 if (!nft_is_active_next(ctx->net, set))
1451                         continue;
1452
1453                 if (nft_set_is_anonymous(set))
1454                         continue;
1455
1456                 err = nft_delset(ctx, set);
1457                 if (err < 0)
1458                         goto out;
1459         }
1460
1461         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1462                 if (!nft_is_active_next(ctx->net, flowtable))
1463                         continue;
1464
1465                 err = nft_delflowtable(ctx, flowtable);
1466                 if (err < 0)
1467                         goto out;
1468         }
1469
1470         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1471                 if (!nft_is_active_next(ctx->net, obj))
1472                         continue;
1473
1474                 err = nft_delobj(ctx, obj);
1475                 if (err < 0)
1476                         goto out;
1477         }
1478
1479         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1480                 if (!nft_is_active_next(ctx->net, chain))
1481                         continue;
1482
1483                 if (nft_chain_binding(chain))
1484                         continue;
1485
1486                 ctx->chain = chain;
1487
1488                 err = nft_delchain(ctx);
1489                 if (err < 0)
1490                         goto out;
1491         }
1492
1493         err = nft_deltable(ctx);
1494 out:
1495         return err;
1496 }
1497
1498 static int nft_flush(struct nft_ctx *ctx, int family)
1499 {
1500         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1501         const struct nlattr * const *nla = ctx->nla;
1502         struct nft_table *table, *nt;
1503         int err = 0;
1504
1505         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1506                 if (family != AF_UNSPEC && table->family != family)
1507                         continue;
1508
1509                 ctx->family = table->family;
1510
1511                 if (!nft_is_active_next(ctx->net, table))
1512                         continue;
1513
1514                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1515                         continue;
1516
1517                 if (nla[NFTA_TABLE_NAME] &&
1518                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1519                         continue;
1520
1521                 ctx->table = table;
1522
1523                 err = nft_flush_table(ctx);
1524                 if (err < 0)
1525                         goto out;
1526         }
1527 out:
1528         return err;
1529 }
1530
1531 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1532                               const struct nlattr * const nla[])
1533 {
1534         struct netlink_ext_ack *extack = info->extack;
1535         u8 genmask = nft_genmask_next(info->net);
1536         u8 family = info->nfmsg->nfgen_family;
1537         struct net *net = info->net;
1538         const struct nlattr *attr;
1539         struct nft_table *table;
1540         struct nft_ctx ctx;
1541
1542         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1543         if (family == AF_UNSPEC ||
1544             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1545                 return nft_flush(&ctx, family);
1546
1547         if (nla[NFTA_TABLE_HANDLE]) {
1548                 attr = nla[NFTA_TABLE_HANDLE];
1549                 table = nft_table_lookup_byhandle(net, attr, genmask,
1550                                                   NETLINK_CB(skb).portid);
1551         } else {
1552                 attr = nla[NFTA_TABLE_NAME];
1553                 table = nft_table_lookup(net, attr, family, genmask,
1554                                          NETLINK_CB(skb).portid);
1555         }
1556
1557         if (IS_ERR(table)) {
1558                 if (PTR_ERR(table) == -ENOENT &&
1559                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1560                         return 0;
1561
1562                 NL_SET_BAD_ATTR(extack, attr);
1563                 return PTR_ERR(table);
1564         }
1565
1566         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1567             table->use > 0)
1568                 return -EBUSY;
1569
1570         ctx.family = family;
1571         ctx.table = table;
1572
1573         return nft_flush_table(&ctx);
1574 }
1575
1576 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1577 {
1578         if (WARN_ON(ctx->table->use > 0))
1579                 return;
1580
1581         rhltable_destroy(&ctx->table->chains_ht);
1582         kfree(ctx->table->name);
1583         kfree(ctx->table->udata);
1584         kfree(ctx->table);
1585 }
1586
1587 void nft_register_chain_type(const struct nft_chain_type *ctype)
1588 {
1589         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1590         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1591                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1592                 return;
1593         }
1594         chain_type[ctype->family][ctype->type] = ctype;
1595         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1596 }
1597 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1598
1599 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1600 {
1601         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1602         chain_type[ctype->family][ctype->type] = NULL;
1603         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1604 }
1605 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1606
1607 /*
1608  * Chains
1609  */
1610
1611 static struct nft_chain *
1612 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1613 {
1614         struct nft_chain *chain;
1615
1616         list_for_each_entry(chain, &table->chains, list) {
1617                 if (chain->handle == handle &&
1618                     nft_active_genmask(chain, genmask))
1619                         return chain;
1620         }
1621
1622         return ERR_PTR(-ENOENT);
1623 }
1624
1625 static bool lockdep_commit_lock_is_held(const struct net *net)
1626 {
1627 #ifdef CONFIG_PROVE_LOCKING
1628         struct nftables_pernet *nft_net = nft_pernet(net);
1629
1630         return lockdep_is_held(&nft_net->commit_mutex);
1631 #else
1632         return true;
1633 #endif
1634 }
1635
1636 static struct nft_chain *nft_chain_lookup(struct net *net,
1637                                           struct nft_table *table,
1638                                           const struct nlattr *nla, u8 genmask)
1639 {
1640         char search[NFT_CHAIN_MAXNAMELEN + 1];
1641         struct rhlist_head *tmp, *list;
1642         struct nft_chain *chain;
1643
1644         if (nla == NULL)
1645                 return ERR_PTR(-EINVAL);
1646
1647         nla_strscpy(search, nla, sizeof(search));
1648
1649         WARN_ON(!rcu_read_lock_held() &&
1650                 !lockdep_commit_lock_is_held(net));
1651
1652         chain = ERR_PTR(-ENOENT);
1653         rcu_read_lock();
1654         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1655         if (!list)
1656                 goto out_unlock;
1657
1658         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1659                 if (nft_active_genmask(chain, genmask))
1660                         goto out_unlock;
1661         }
1662         chain = ERR_PTR(-ENOENT);
1663 out_unlock:
1664         rcu_read_unlock();
1665         return chain;
1666 }
1667
1668 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1669         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1670                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1671         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1672         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1673                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1674         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1675         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1676         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1677                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1678         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1679         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1680         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1681         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1682                                     .len = NFT_USERDATA_MAXLEN },
1683 };
1684
1685 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1686         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1687         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1688         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1689                                     .len = IFNAMSIZ - 1 },
1690 };
1691
1692 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1693 {
1694         struct nft_stats *cpu_stats, total;
1695         struct nlattr *nest;
1696         unsigned int seq;
1697         u64 pkts, bytes;
1698         int cpu;
1699
1700         if (!stats)
1701                 return 0;
1702
1703         memset(&total, 0, sizeof(total));
1704         for_each_possible_cpu(cpu) {
1705                 cpu_stats = per_cpu_ptr(stats, cpu);
1706                 do {
1707                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1708                         pkts = cpu_stats->pkts;
1709                         bytes = cpu_stats->bytes;
1710                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1711                 total.pkts += pkts;
1712                 total.bytes += bytes;
1713         }
1714         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1715         if (nest == NULL)
1716                 goto nla_put_failure;
1717
1718         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1719                          NFTA_COUNTER_PAD) ||
1720             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1721                          NFTA_COUNTER_PAD))
1722                 goto nla_put_failure;
1723
1724         nla_nest_end(skb, nest);
1725         return 0;
1726
1727 nla_put_failure:
1728         return -ENOSPC;
1729 }
1730
1731 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1732                                    const struct nft_base_chain *basechain,
1733                                    const struct list_head *hook_list)
1734 {
1735         const struct nf_hook_ops *ops = &basechain->ops;
1736         struct nft_hook *hook, *first = NULL;
1737         struct nlattr *nest, *nest_devs;
1738         int n = 0;
1739
1740         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1741         if (nest == NULL)
1742                 goto nla_put_failure;
1743         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1744                 goto nla_put_failure;
1745         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1746                 goto nla_put_failure;
1747
1748         if (nft_base_chain_netdev(family, ops->hooknum)) {
1749                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1750                 if (!nest_devs)
1751                         goto nla_put_failure;
1752
1753                 if (!hook_list)
1754                         hook_list = &basechain->hook_list;
1755
1756                 list_for_each_entry(hook, hook_list, list) {
1757                         if (!first)
1758                                 first = hook;
1759
1760                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1761                                            hook->ops.dev->name))
1762                                 goto nla_put_failure;
1763                         n++;
1764                 }
1765                 nla_nest_end(skb, nest_devs);
1766
1767                 if (n == 1 &&
1768                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1769                         goto nla_put_failure;
1770         }
1771         nla_nest_end(skb, nest);
1772
1773         return 0;
1774 nla_put_failure:
1775         return -1;
1776 }
1777
1778 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1779                                      u32 portid, u32 seq, int event, u32 flags,
1780                                      int family, const struct nft_table *table,
1781                                      const struct nft_chain *chain,
1782                                      const struct list_head *hook_list)
1783 {
1784         struct nlmsghdr *nlh;
1785
1786         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1787         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1788                            NFNETLINK_V0, nft_base_seq(net));
1789         if (!nlh)
1790                 goto nla_put_failure;
1791
1792         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1793             nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1794             nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1795                          NFTA_CHAIN_PAD))
1796                 goto nla_put_failure;
1797
1798         if (event == NFT_MSG_DELCHAIN && !hook_list) {
1799                 nlmsg_end(skb, nlh);
1800                 return 0;
1801         }
1802
1803         if (nft_is_base_chain(chain)) {
1804                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1805                 struct nft_stats __percpu *stats;
1806
1807                 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1808                         goto nla_put_failure;
1809
1810                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1811                                  htonl(basechain->policy)))
1812                         goto nla_put_failure;
1813
1814                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1815                         goto nla_put_failure;
1816
1817                 stats = rcu_dereference_check(basechain->stats,
1818                                               lockdep_commit_lock_is_held(net));
1819                 if (nft_dump_stats(skb, stats))
1820                         goto nla_put_failure;
1821         }
1822
1823         if (chain->flags &&
1824             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1825                 goto nla_put_failure;
1826
1827         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1828                 goto nla_put_failure;
1829
1830         if (chain->udata &&
1831             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1832                 goto nla_put_failure;
1833
1834         nlmsg_end(skb, nlh);
1835         return 0;
1836
1837 nla_put_failure:
1838         nlmsg_trim(skb, nlh);
1839         return -1;
1840 }
1841
1842 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1843                                    const struct list_head *hook_list)
1844 {
1845         struct nftables_pernet *nft_net;
1846         struct sk_buff *skb;
1847         u16 flags = 0;
1848         int err;
1849
1850         if (!ctx->report &&
1851             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1852                 return;
1853
1854         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1855         if (skb == NULL)
1856                 goto err;
1857
1858         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1859                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1860
1861         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1862                                         event, flags, ctx->family, ctx->table,
1863                                         ctx->chain, hook_list);
1864         if (err < 0) {
1865                 kfree_skb(skb);
1866                 goto err;
1867         }
1868
1869         nft_net = nft_pernet(ctx->net);
1870         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1871         return;
1872 err:
1873         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1874 }
1875
1876 static int nf_tables_dump_chains(struct sk_buff *skb,
1877                                  struct netlink_callback *cb)
1878 {
1879         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1880         unsigned int idx = 0, s_idx = cb->args[0];
1881         struct net *net = sock_net(skb->sk);
1882         int family = nfmsg->nfgen_family;
1883         struct nftables_pernet *nft_net;
1884         const struct nft_table *table;
1885         const struct nft_chain *chain;
1886
1887         rcu_read_lock();
1888         nft_net = nft_pernet(net);
1889         cb->seq = READ_ONCE(nft_net->base_seq);
1890
1891         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1892                 if (family != NFPROTO_UNSPEC && family != table->family)
1893                         continue;
1894
1895                 list_for_each_entry_rcu(chain, &table->chains, list) {
1896                         if (idx < s_idx)
1897                                 goto cont;
1898                         if (idx > s_idx)
1899                                 memset(&cb->args[1], 0,
1900                                        sizeof(cb->args) - sizeof(cb->args[0]));
1901                         if (!nft_is_active(net, chain))
1902                                 continue;
1903                         if (nf_tables_fill_chain_info(skb, net,
1904                                                       NETLINK_CB(cb->skb).portid,
1905                                                       cb->nlh->nlmsg_seq,
1906                                                       NFT_MSG_NEWCHAIN,
1907                                                       NLM_F_MULTI,
1908                                                       table->family, table,
1909                                                       chain, NULL) < 0)
1910                                 goto done;
1911
1912                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1913 cont:
1914                         idx++;
1915                 }
1916         }
1917 done:
1918         rcu_read_unlock();
1919         cb->args[0] = idx;
1920         return skb->len;
1921 }
1922
1923 /* called with rcu_read_lock held */
1924 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1925                               const struct nlattr * const nla[])
1926 {
1927         struct netlink_ext_ack *extack = info->extack;
1928         u8 genmask = nft_genmask_cur(info->net);
1929         u8 family = info->nfmsg->nfgen_family;
1930         const struct nft_chain *chain;
1931         struct net *net = info->net;
1932         struct nft_table *table;
1933         struct sk_buff *skb2;
1934         int err;
1935
1936         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1937                 struct netlink_dump_control c = {
1938                         .dump = nf_tables_dump_chains,
1939                         .module = THIS_MODULE,
1940                 };
1941
1942                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1943         }
1944
1945         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1946         if (IS_ERR(table)) {
1947                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1948                 return PTR_ERR(table);
1949         }
1950
1951         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1952         if (IS_ERR(chain)) {
1953                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1954                 return PTR_ERR(chain);
1955         }
1956
1957         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1958         if (!skb2)
1959                 return -ENOMEM;
1960
1961         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1962                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1963                                         0, family, table, chain, NULL);
1964         if (err < 0)
1965                 goto err_fill_chain_info;
1966
1967         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1968
1969 err_fill_chain_info:
1970         kfree_skb(skb2);
1971         return err;
1972 }
1973
1974 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1975         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1976         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1977 };
1978
1979 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1980 {
1981         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1982         struct nft_stats __percpu *newstats;
1983         struct nft_stats *stats;
1984         int err;
1985
1986         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1987                                           nft_counter_policy, NULL);
1988         if (err < 0)
1989                 return ERR_PTR(err);
1990
1991         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1992                 return ERR_PTR(-EINVAL);
1993
1994         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1995         if (newstats == NULL)
1996                 return ERR_PTR(-ENOMEM);
1997
1998         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1999          * are not exposed to userspace.
2000          */
2001         preempt_disable();
2002         stats = this_cpu_ptr(newstats);
2003         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2004         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2005         preempt_enable();
2006
2007         return newstats;
2008 }
2009
2010 static void nft_chain_stats_replace(struct nft_trans *trans)
2011 {
2012         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2013
2014         if (!nft_trans_chain_stats(trans))
2015                 return;
2016
2017         nft_trans_chain_stats(trans) =
2018                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2019                                     lockdep_commit_lock_is_held(trans->ctx.net));
2020
2021         if (!nft_trans_chain_stats(trans))
2022                 static_branch_inc(&nft_counters_enabled);
2023 }
2024
2025 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2026 {
2027         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2028         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2029
2030         if (g0 != g1)
2031                 kvfree(g1);
2032         kvfree(g0);
2033
2034         /* should be NULL either via abort or via successful commit */
2035         WARN_ON_ONCE(chain->blob_next);
2036         kvfree(chain->blob_next);
2037 }
2038
2039 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2040 {
2041         struct nft_chain *chain = ctx->chain;
2042         struct nft_hook *hook, *next;
2043
2044         if (WARN_ON(chain->use > 0))
2045                 return;
2046
2047         /* no concurrent access possible anymore */
2048         nf_tables_chain_free_chain_rules(chain);
2049
2050         if (nft_is_base_chain(chain)) {
2051                 struct nft_base_chain *basechain = nft_base_chain(chain);
2052
2053                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2054                         list_for_each_entry_safe(hook, next,
2055                                                  &basechain->hook_list, list) {
2056                                 list_del_rcu(&hook->list);
2057                                 kfree_rcu(hook, rcu);
2058                         }
2059                 }
2060                 module_put(basechain->type->owner);
2061                 if (rcu_access_pointer(basechain->stats)) {
2062                         static_branch_dec(&nft_counters_enabled);
2063                         free_percpu(rcu_dereference_raw(basechain->stats));
2064                 }
2065                 kfree(chain->name);
2066                 kfree(chain->udata);
2067                 kfree(basechain);
2068         } else {
2069                 kfree(chain->name);
2070                 kfree(chain->udata);
2071                 kfree(chain);
2072         }
2073 }
2074
2075 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2076                                               const struct nlattr *attr)
2077 {
2078         struct net_device *dev;
2079         char ifname[IFNAMSIZ];
2080         struct nft_hook *hook;
2081         int err;
2082
2083         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2084         if (!hook) {
2085                 err = -ENOMEM;
2086                 goto err_hook_alloc;
2087         }
2088
2089         nla_strscpy(ifname, attr, IFNAMSIZ);
2090         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2091          * indirectly serializing all the other holders of the commit_mutex with
2092          * the rtnl_mutex.
2093          */
2094         dev = __dev_get_by_name(net, ifname);
2095         if (!dev) {
2096                 err = -ENOENT;
2097                 goto err_hook_dev;
2098         }
2099         hook->ops.dev = dev;
2100
2101         return hook;
2102
2103 err_hook_dev:
2104         kfree(hook);
2105 err_hook_alloc:
2106         return ERR_PTR(err);
2107 }
2108
2109 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2110                                            const struct nft_hook *this)
2111 {
2112         struct nft_hook *hook;
2113
2114         list_for_each_entry(hook, hook_list, list) {
2115                 if (this->ops.dev == hook->ops.dev)
2116                         return hook;
2117         }
2118
2119         return NULL;
2120 }
2121
2122 static int nf_tables_parse_netdev_hooks(struct net *net,
2123                                         const struct nlattr *attr,
2124                                         struct list_head *hook_list,
2125                                         struct netlink_ext_ack *extack)
2126 {
2127         struct nft_hook *hook, *next;
2128         const struct nlattr *tmp;
2129         int rem, n = 0, err;
2130
2131         nla_for_each_nested(tmp, attr, rem) {
2132                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2133                         err = -EINVAL;
2134                         goto err_hook;
2135                 }
2136
2137                 hook = nft_netdev_hook_alloc(net, tmp);
2138                 if (IS_ERR(hook)) {
2139                         NL_SET_BAD_ATTR(extack, tmp);
2140                         err = PTR_ERR(hook);
2141                         goto err_hook;
2142                 }
2143                 if (nft_hook_list_find(hook_list, hook)) {
2144                         NL_SET_BAD_ATTR(extack, tmp);
2145                         kfree(hook);
2146                         err = -EEXIST;
2147                         goto err_hook;
2148                 }
2149                 list_add_tail(&hook->list, hook_list);
2150                 n++;
2151
2152                 if (n == NFT_NETDEVICE_MAX) {
2153                         err = -EFBIG;
2154                         goto err_hook;
2155                 }
2156         }
2157
2158         return 0;
2159
2160 err_hook:
2161         list_for_each_entry_safe(hook, next, hook_list, list) {
2162                 list_del(&hook->list);
2163                 kfree(hook);
2164         }
2165         return err;
2166 }
2167
2168 struct nft_chain_hook {
2169         u32                             num;
2170         s32                             priority;
2171         const struct nft_chain_type     *type;
2172         struct list_head                list;
2173 };
2174
2175 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2176                                   struct list_head *hook_list,
2177                                   struct netlink_ext_ack *extack, u32 flags)
2178 {
2179         struct nft_hook *hook;
2180         int err;
2181
2182         if (tb[NFTA_HOOK_DEV]) {
2183                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2184                 if (IS_ERR(hook)) {
2185                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2186                         return PTR_ERR(hook);
2187                 }
2188
2189                 list_add_tail(&hook->list, hook_list);
2190         } else if (tb[NFTA_HOOK_DEVS]) {
2191                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2192                                                    hook_list, extack);
2193                 if (err < 0)
2194                         return err;
2195
2196         }
2197
2198         if (flags & NFT_CHAIN_HW_OFFLOAD &&
2199             list_empty(hook_list))
2200                 return -EINVAL;
2201
2202         return 0;
2203 }
2204
2205 static int nft_chain_parse_hook(struct net *net,
2206                                 struct nft_base_chain *basechain,
2207                                 const struct nlattr * const nla[],
2208                                 struct nft_chain_hook *hook, u8 family,
2209                                 u32 flags, struct netlink_ext_ack *extack)
2210 {
2211         struct nftables_pernet *nft_net = nft_pernet(net);
2212         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2213         const struct nft_chain_type *type;
2214         int err;
2215
2216         lockdep_assert_held(&nft_net->commit_mutex);
2217         lockdep_nfnl_nft_mutex_not_held();
2218
2219         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2220                                           nla[NFTA_CHAIN_HOOK],
2221                                           nft_hook_policy, NULL);
2222         if (err < 0)
2223                 return err;
2224
2225         if (!basechain) {
2226                 if (!ha[NFTA_HOOK_HOOKNUM] ||
2227                     !ha[NFTA_HOOK_PRIORITY]) {
2228                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2229                         return -ENOENT;
2230                 }
2231
2232                 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2233                 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2234
2235                 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2236                 if (!type)
2237                         return -EOPNOTSUPP;
2238
2239                 if (nla[NFTA_CHAIN_TYPE]) {
2240                         type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2241                                                            family, true);
2242                         if (IS_ERR(type)) {
2243                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2244                                 return PTR_ERR(type);
2245                         }
2246                 }
2247                 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2248                         return -EOPNOTSUPP;
2249
2250                 if (type->type == NFT_CHAIN_T_NAT &&
2251                     hook->priority <= NF_IP_PRI_CONNTRACK)
2252                         return -EOPNOTSUPP;
2253         } else {
2254                 if (ha[NFTA_HOOK_HOOKNUM]) {
2255                         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2256                         if (hook->num != basechain->ops.hooknum)
2257                                 return -EOPNOTSUPP;
2258                 }
2259                 if (ha[NFTA_HOOK_PRIORITY]) {
2260                         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2261                         if (hook->priority != basechain->ops.priority)
2262                                 return -EOPNOTSUPP;
2263                 }
2264
2265                 type = basechain->type;
2266         }
2267
2268         if (!try_module_get(type->owner)) {
2269                 if (nla[NFTA_CHAIN_TYPE])
2270                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2271                 return -ENOENT;
2272         }
2273
2274         hook->type = type;
2275
2276         INIT_LIST_HEAD(&hook->list);
2277         if (nft_base_chain_netdev(family, hook->num)) {
2278                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2279                 if (err < 0) {
2280                         module_put(type->owner);
2281                         return err;
2282                 }
2283         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2284                 module_put(type->owner);
2285                 return -EOPNOTSUPP;
2286         }
2287
2288         return 0;
2289 }
2290
2291 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2292 {
2293         struct nft_hook *h, *next;
2294
2295         list_for_each_entry_safe(h, next, &hook->list, list) {
2296                 list_del(&h->list);
2297                 kfree(h);
2298         }
2299         module_put(hook->type->owner);
2300 }
2301
2302 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2303 {
2304         struct nft_rule_dp_last *lrule;
2305
2306         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2307
2308         lrule = (struct nft_rule_dp_last *)ptr;
2309         lrule->end.is_last = 1;
2310         lrule->chain = chain;
2311         /* blob size does not include the trailer rule */
2312 }
2313
2314 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2315                                                          unsigned int size)
2316 {
2317         struct nft_rule_blob *blob;
2318
2319         if (size > INT_MAX)
2320                 return NULL;
2321
2322         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2323
2324         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2325         if (!blob)
2326                 return NULL;
2327
2328         blob->size = 0;
2329         nft_last_rule(chain, blob->data);
2330
2331         return blob;
2332 }
2333
2334 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2335                                     const struct nft_chain_hook *hook,
2336                                     struct nft_chain *chain)
2337 {
2338         ops->pf                 = family;
2339         ops->hooknum            = hook->num;
2340         ops->priority           = hook->priority;
2341         ops->priv               = chain;
2342         ops->hook               = hook->type->hooks[ops->hooknum];
2343         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2344 }
2345
2346 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2347                               struct nft_chain_hook *hook, u32 flags)
2348 {
2349         struct nft_chain *chain;
2350         struct nft_hook *h;
2351
2352         basechain->type = hook->type;
2353         INIT_LIST_HEAD(&basechain->hook_list);
2354         chain = &basechain->chain;
2355
2356         if (nft_base_chain_netdev(family, hook->num)) {
2357                 list_splice_init(&hook->list, &basechain->hook_list);
2358                 list_for_each_entry(h, &basechain->hook_list, list)
2359                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2360         }
2361         nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2362
2363         chain->flags |= NFT_CHAIN_BASE | flags;
2364         basechain->policy = NF_ACCEPT;
2365         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2366             !nft_chain_offload_support(basechain)) {
2367                 list_splice_init(&basechain->hook_list, &hook->list);
2368                 return -EOPNOTSUPP;
2369         }
2370
2371         flow_block_init(&basechain->flow_block);
2372
2373         return 0;
2374 }
2375
2376 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2377 {
2378         int err;
2379
2380         err = rhltable_insert_key(&table->chains_ht, chain->name,
2381                                   &chain->rhlhead, nft_chain_ht_params);
2382         if (err)
2383                 return err;
2384
2385         list_add_tail_rcu(&chain->list, &table->chains);
2386
2387         return 0;
2388 }
2389
2390 static u64 chain_id;
2391
2392 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2393                               u8 policy, u32 flags,
2394                               struct netlink_ext_ack *extack)
2395 {
2396         const struct nlattr * const *nla = ctx->nla;
2397         struct nft_table *table = ctx->table;
2398         struct nft_base_chain *basechain;
2399         struct net *net = ctx->net;
2400         char name[NFT_NAME_MAXLEN];
2401         struct nft_rule_blob *blob;
2402         struct nft_trans *trans;
2403         struct nft_chain *chain;
2404         int err;
2405
2406         if (nla[NFTA_CHAIN_HOOK]) {
2407                 struct nft_stats __percpu *stats = NULL;
2408                 struct nft_chain_hook hook = {};
2409
2410                 if (flags & NFT_CHAIN_BINDING)
2411                         return -EOPNOTSUPP;
2412
2413                 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2414                                            extack);
2415                 if (err < 0)
2416                         return err;
2417
2418                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2419                 if (basechain == NULL) {
2420                         nft_chain_release_hook(&hook);
2421                         return -ENOMEM;
2422                 }
2423                 chain = &basechain->chain;
2424
2425                 if (nla[NFTA_CHAIN_COUNTERS]) {
2426                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2427                         if (IS_ERR(stats)) {
2428                                 nft_chain_release_hook(&hook);
2429                                 kfree(basechain);
2430                                 return PTR_ERR(stats);
2431                         }
2432                         rcu_assign_pointer(basechain->stats, stats);
2433                 }
2434
2435                 err = nft_basechain_init(basechain, family, &hook, flags);
2436                 if (err < 0) {
2437                         nft_chain_release_hook(&hook);
2438                         kfree(basechain);
2439                         free_percpu(stats);
2440                         return err;
2441                 }
2442                 if (stats)
2443                         static_branch_inc(&nft_counters_enabled);
2444         } else {
2445                 if (flags & NFT_CHAIN_BASE)
2446                         return -EINVAL;
2447                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2448                         return -EOPNOTSUPP;
2449
2450                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2451                 if (chain == NULL)
2452                         return -ENOMEM;
2453
2454                 chain->flags = flags;
2455         }
2456         ctx->chain = chain;
2457
2458         INIT_LIST_HEAD(&chain->rules);
2459         chain->handle = nf_tables_alloc_handle(table);
2460         chain->table = table;
2461
2462         if (nla[NFTA_CHAIN_NAME]) {
2463                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2464         } else {
2465                 if (!(flags & NFT_CHAIN_BINDING)) {
2466                         err = -EINVAL;
2467                         goto err_destroy_chain;
2468                 }
2469
2470                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2471                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2472         }
2473
2474         if (!chain->name) {
2475                 err = -ENOMEM;
2476                 goto err_destroy_chain;
2477         }
2478
2479         if (nla[NFTA_CHAIN_USERDATA]) {
2480                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2481                 if (chain->udata == NULL) {
2482                         err = -ENOMEM;
2483                         goto err_destroy_chain;
2484                 }
2485                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2486         }
2487
2488         blob = nf_tables_chain_alloc_rules(chain, 0);
2489         if (!blob) {
2490                 err = -ENOMEM;
2491                 goto err_destroy_chain;
2492         }
2493
2494         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2495         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2496
2497         err = nf_tables_register_hook(net, table, chain);
2498         if (err < 0)
2499                 goto err_destroy_chain;
2500
2501         if (!nft_use_inc(&table->use)) {
2502                 err = -EMFILE;
2503                 goto err_use;
2504         }
2505
2506         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2507         if (IS_ERR(trans)) {
2508                 err = PTR_ERR(trans);
2509                 goto err_unregister_hook;
2510         }
2511
2512         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2513         if (nft_is_base_chain(chain))
2514                 nft_trans_chain_policy(trans) = policy;
2515
2516         err = nft_chain_add(table, chain);
2517         if (err < 0) {
2518                 nft_trans_destroy(trans);
2519                 goto err_unregister_hook;
2520         }
2521
2522         return 0;
2523
2524 err_unregister_hook:
2525         nft_use_dec_restore(&table->use);
2526 err_use:
2527         nf_tables_unregister_hook(net, table, chain);
2528 err_destroy_chain:
2529         nf_tables_chain_destroy(ctx);
2530
2531         return err;
2532 }
2533
2534 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2535                               u32 flags, const struct nlattr *attr,
2536                               struct netlink_ext_ack *extack)
2537 {
2538         const struct nlattr * const *nla = ctx->nla;
2539         struct nft_base_chain *basechain = NULL;
2540         struct nft_table *table = ctx->table;
2541         struct nft_chain *chain = ctx->chain;
2542         struct nft_chain_hook hook = {};
2543         struct nft_stats *stats = NULL;
2544         struct nft_hook *h, *next;
2545         struct nf_hook_ops *ops;
2546         struct nft_trans *trans;
2547         bool unregister = false;
2548         int err;
2549
2550         if (chain->flags ^ flags)
2551                 return -EOPNOTSUPP;
2552
2553         INIT_LIST_HEAD(&hook.list);
2554
2555         if (nla[NFTA_CHAIN_HOOK]) {
2556                 if (!nft_is_base_chain(chain)) {
2557                         NL_SET_BAD_ATTR(extack, attr);
2558                         return -EEXIST;
2559                 }
2560
2561                 basechain = nft_base_chain(chain);
2562                 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2563                                            ctx->family, flags, extack);
2564                 if (err < 0)
2565                         return err;
2566
2567                 if (basechain->type != hook.type) {
2568                         nft_chain_release_hook(&hook);
2569                         NL_SET_BAD_ATTR(extack, attr);
2570                         return -EEXIST;
2571                 }
2572
2573                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2574                         list_for_each_entry_safe(h, next, &hook.list, list) {
2575                                 h->ops.pf       = basechain->ops.pf;
2576                                 h->ops.hooknum  = basechain->ops.hooknum;
2577                                 h->ops.priority = basechain->ops.priority;
2578                                 h->ops.priv     = basechain->ops.priv;
2579                                 h->ops.hook     = basechain->ops.hook;
2580
2581                                 if (nft_hook_list_find(&basechain->hook_list, h)) {
2582                                         list_del(&h->list);
2583                                         kfree(h);
2584                                 }
2585                         }
2586                 } else {
2587                         ops = &basechain->ops;
2588                         if (ops->hooknum != hook.num ||
2589                             ops->priority != hook.priority) {
2590                                 nft_chain_release_hook(&hook);
2591                                 NL_SET_BAD_ATTR(extack, attr);
2592                                 return -EEXIST;
2593                         }
2594                 }
2595         }
2596
2597         if (nla[NFTA_CHAIN_HANDLE] &&
2598             nla[NFTA_CHAIN_NAME]) {
2599                 struct nft_chain *chain2;
2600
2601                 chain2 = nft_chain_lookup(ctx->net, table,
2602                                           nla[NFTA_CHAIN_NAME], genmask);
2603                 if (!IS_ERR(chain2)) {
2604                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2605                         err = -EEXIST;
2606                         goto err_hooks;
2607                 }
2608         }
2609
2610         if (nla[NFTA_CHAIN_COUNTERS]) {
2611                 if (!nft_is_base_chain(chain)) {
2612                         err = -EOPNOTSUPP;
2613                         goto err_hooks;
2614                 }
2615
2616                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2617                 if (IS_ERR(stats)) {
2618                         err = PTR_ERR(stats);
2619                         goto err_hooks;
2620                 }
2621         }
2622
2623         if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2624             nft_is_base_chain(chain) &&
2625             !list_empty(&hook.list)) {
2626                 basechain = nft_base_chain(chain);
2627                 ops = &basechain->ops;
2628
2629                 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2630                         err = nft_netdev_register_hooks(ctx->net, &hook.list);
2631                         if (err < 0)
2632                                 goto err_hooks;
2633                 }
2634         }
2635
2636         unregister = true;
2637         err = -ENOMEM;
2638         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2639                                 sizeof(struct nft_trans_chain));
2640         if (trans == NULL)
2641                 goto err_trans;
2642
2643         nft_trans_chain_stats(trans) = stats;
2644         nft_trans_chain_update(trans) = true;
2645
2646         if (nla[NFTA_CHAIN_POLICY])
2647                 nft_trans_chain_policy(trans) = policy;
2648         else
2649                 nft_trans_chain_policy(trans) = -1;
2650
2651         if (nla[NFTA_CHAIN_HANDLE] &&
2652             nla[NFTA_CHAIN_NAME]) {
2653                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2654                 struct nft_trans *tmp;
2655                 char *name;
2656
2657                 err = -ENOMEM;
2658                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2659                 if (!name)
2660                         goto err_trans;
2661
2662                 err = -EEXIST;
2663                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2664                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2665                             tmp->ctx.table == table &&
2666                             nft_trans_chain_update(tmp) &&
2667                             nft_trans_chain_name(tmp) &&
2668                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2669                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2670                                 kfree(name);
2671                                 goto err_trans;
2672                         }
2673                 }
2674
2675                 nft_trans_chain_name(trans) = name;
2676         }
2677
2678         nft_trans_basechain(trans) = basechain;
2679         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2680         list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2681         if (nla[NFTA_CHAIN_HOOK])
2682                 module_put(hook.type->owner);
2683
2684         nft_trans_commit_list_add_tail(ctx->net, trans);
2685
2686         return 0;
2687
2688 err_trans:
2689         free_percpu(stats);
2690         kfree(trans);
2691 err_hooks:
2692         if (nla[NFTA_CHAIN_HOOK]) {
2693                 list_for_each_entry_safe(h, next, &hook.list, list) {
2694                         if (unregister)
2695                                 nf_unregister_net_hook(ctx->net, &h->ops);
2696                         list_del(&h->list);
2697                         kfree_rcu(h, rcu);
2698                 }
2699                 module_put(hook.type->owner);
2700         }
2701
2702         return err;
2703 }
2704
2705 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2706                                                const struct nft_table *table,
2707                                                const struct nlattr *nla, u8 genmask)
2708 {
2709         struct nftables_pernet *nft_net = nft_pernet(net);
2710         u32 id = ntohl(nla_get_be32(nla));
2711         struct nft_trans *trans;
2712
2713         list_for_each_entry(trans, &nft_net->commit_list, list) {
2714                 struct nft_chain *chain = trans->ctx.chain;
2715
2716                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2717                     chain->table == table &&
2718                     id == nft_trans_chain_id(trans) &&
2719                     nft_active_genmask(chain, genmask))
2720                         return chain;
2721         }
2722         return ERR_PTR(-ENOENT);
2723 }
2724
2725 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2726                               const struct nlattr * const nla[])
2727 {
2728         struct nftables_pernet *nft_net = nft_pernet(info->net);
2729         struct netlink_ext_ack *extack = info->extack;
2730         u8 genmask = nft_genmask_next(info->net);
2731         u8 family = info->nfmsg->nfgen_family;
2732         struct nft_chain *chain = NULL;
2733         struct net *net = info->net;
2734         const struct nlattr *attr;
2735         struct nft_table *table;
2736         u8 policy = NF_ACCEPT;
2737         struct nft_ctx ctx;
2738         u64 handle = 0;
2739         u32 flags = 0;
2740
2741         lockdep_assert_held(&nft_net->commit_mutex);
2742
2743         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2744                                  NETLINK_CB(skb).portid);
2745         if (IS_ERR(table)) {
2746                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2747                 return PTR_ERR(table);
2748         }
2749
2750         chain = NULL;
2751         attr = nla[NFTA_CHAIN_NAME];
2752
2753         if (nla[NFTA_CHAIN_HANDLE]) {
2754                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2755                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2756                 if (IS_ERR(chain)) {
2757                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2758                         return PTR_ERR(chain);
2759                 }
2760                 attr = nla[NFTA_CHAIN_HANDLE];
2761         } else if (nla[NFTA_CHAIN_NAME]) {
2762                 chain = nft_chain_lookup(net, table, attr, genmask);
2763                 if (IS_ERR(chain)) {
2764                         if (PTR_ERR(chain) != -ENOENT) {
2765                                 NL_SET_BAD_ATTR(extack, attr);
2766                                 return PTR_ERR(chain);
2767                         }
2768                         chain = NULL;
2769                 }
2770         } else if (!nla[NFTA_CHAIN_ID]) {
2771                 return -EINVAL;
2772         }
2773
2774         if (nla[NFTA_CHAIN_POLICY]) {
2775                 if (chain != NULL &&
2776                     !nft_is_base_chain(chain)) {
2777                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2778                         return -EOPNOTSUPP;
2779                 }
2780
2781                 if (chain == NULL &&
2782                     nla[NFTA_CHAIN_HOOK] == NULL) {
2783                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2784                         return -EOPNOTSUPP;
2785                 }
2786
2787                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2788                 switch (policy) {
2789                 case NF_DROP:
2790                 case NF_ACCEPT:
2791                         break;
2792                 default:
2793                         return -EINVAL;
2794                 }
2795         }
2796
2797         if (nla[NFTA_CHAIN_FLAGS])
2798                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2799         else if (chain)
2800                 flags = chain->flags;
2801
2802         if (flags & ~NFT_CHAIN_FLAGS)
2803                 return -EOPNOTSUPP;
2804
2805         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2806
2807         if (chain != NULL) {
2808                 if (chain->flags & NFT_CHAIN_BINDING)
2809                         return -EINVAL;
2810
2811                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2812                         NL_SET_BAD_ATTR(extack, attr);
2813                         return -EEXIST;
2814                 }
2815                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2816                         return -EOPNOTSUPP;
2817
2818                 flags |= chain->flags & NFT_CHAIN_BASE;
2819                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2820                                           extack);
2821         }
2822
2823         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2824 }
2825
2826 static int nft_delchain_hook(struct nft_ctx *ctx,
2827                              struct nft_base_chain *basechain,
2828                              struct netlink_ext_ack *extack)
2829 {
2830         const struct nft_chain *chain = &basechain->chain;
2831         const struct nlattr * const *nla = ctx->nla;
2832         struct nft_chain_hook chain_hook = {};
2833         struct nft_hook *this, *hook;
2834         LIST_HEAD(chain_del_list);
2835         struct nft_trans *trans;
2836         int err;
2837
2838         err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2839                                    ctx->family, chain->flags, extack);
2840         if (err < 0)
2841                 return err;
2842
2843         list_for_each_entry(this, &chain_hook.list, list) {
2844                 hook = nft_hook_list_find(&basechain->hook_list, this);
2845                 if (!hook) {
2846                         err = -ENOENT;
2847                         goto err_chain_del_hook;
2848                 }
2849                 list_move(&hook->list, &chain_del_list);
2850         }
2851
2852         trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2853                                 sizeof(struct nft_trans_chain));
2854         if (!trans) {
2855                 err = -ENOMEM;
2856                 goto err_chain_del_hook;
2857         }
2858
2859         nft_trans_basechain(trans) = basechain;
2860         nft_trans_chain_update(trans) = true;
2861         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2862         list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2863         nft_chain_release_hook(&chain_hook);
2864
2865         nft_trans_commit_list_add_tail(ctx->net, trans);
2866
2867         return 0;
2868
2869 err_chain_del_hook:
2870         list_splice(&chain_del_list, &basechain->hook_list);
2871         nft_chain_release_hook(&chain_hook);
2872
2873         return err;
2874 }
2875
2876 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2877                               const struct nlattr * const nla[])
2878 {
2879         struct netlink_ext_ack *extack = info->extack;
2880         u8 genmask = nft_genmask_next(info->net);
2881         u8 family = info->nfmsg->nfgen_family;
2882         struct net *net = info->net;
2883         const struct nlattr *attr;
2884         struct nft_table *table;
2885         struct nft_chain *chain;
2886         struct nft_rule *rule;
2887         struct nft_ctx ctx;
2888         u64 handle;
2889         u32 use;
2890         int err;
2891
2892         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2893                                  NETLINK_CB(skb).portid);
2894         if (IS_ERR(table)) {
2895                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2896                 return PTR_ERR(table);
2897         }
2898
2899         if (nla[NFTA_CHAIN_HANDLE]) {
2900                 attr = nla[NFTA_CHAIN_HANDLE];
2901                 handle = be64_to_cpu(nla_get_be64(attr));
2902                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2903         } else {
2904                 attr = nla[NFTA_CHAIN_NAME];
2905                 chain = nft_chain_lookup(net, table, attr, genmask);
2906         }
2907         if (IS_ERR(chain)) {
2908                 if (PTR_ERR(chain) == -ENOENT &&
2909                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2910                         return 0;
2911
2912                 NL_SET_BAD_ATTR(extack, attr);
2913                 return PTR_ERR(chain);
2914         }
2915
2916         if (nft_chain_binding(chain))
2917                 return -EOPNOTSUPP;
2918
2919         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2920
2921         if (nla[NFTA_CHAIN_HOOK]) {
2922                 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2923                         return -EOPNOTSUPP;
2924
2925                 if (nft_is_base_chain(chain)) {
2926                         struct nft_base_chain *basechain = nft_base_chain(chain);
2927
2928                         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2929                                 return nft_delchain_hook(&ctx, basechain, extack);
2930                 }
2931         }
2932
2933         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2934             chain->use > 0)
2935                 return -EBUSY;
2936
2937         use = chain->use;
2938         list_for_each_entry(rule, &chain->rules, list) {
2939                 if (!nft_is_active_next(net, rule))
2940                         continue;
2941                 use--;
2942
2943                 err = nft_delrule(&ctx, rule);
2944                 if (err < 0)
2945                         return err;
2946         }
2947
2948         /* There are rules and elements that are still holding references to us,
2949          * we cannot do a recursive removal in this case.
2950          */
2951         if (use > 0) {
2952                 NL_SET_BAD_ATTR(extack, attr);
2953                 return -EBUSY;
2954         }
2955
2956         return nft_delchain(&ctx);
2957 }
2958
2959 /*
2960  * Expressions
2961  */
2962
2963 /**
2964  *      nft_register_expr - register nf_tables expr type
2965  *      @type: expr type
2966  *
2967  *      Registers the expr type for use with nf_tables. Returns zero on
2968  *      success or a negative errno code otherwise.
2969  */
2970 int nft_register_expr(struct nft_expr_type *type)
2971 {
2972         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2973         if (type->family == NFPROTO_UNSPEC)
2974                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2975         else
2976                 list_add_rcu(&type->list, &nf_tables_expressions);
2977         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2978         return 0;
2979 }
2980 EXPORT_SYMBOL_GPL(nft_register_expr);
2981
2982 /**
2983  *      nft_unregister_expr - unregister nf_tables expr type
2984  *      @type: expr type
2985  *
2986  *      Unregisters the expr typefor use with nf_tables.
2987  */
2988 void nft_unregister_expr(struct nft_expr_type *type)
2989 {
2990         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2991         list_del_rcu(&type->list);
2992         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2993 }
2994 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2995
2996 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2997                                                        struct nlattr *nla)
2998 {
2999         const struct nft_expr_type *type, *candidate = NULL;
3000
3001         list_for_each_entry(type, &nf_tables_expressions, list) {
3002                 if (!nla_strcmp(nla, type->name)) {
3003                         if (!type->family && !candidate)
3004                                 candidate = type;
3005                         else if (type->family == family)
3006                                 candidate = type;
3007                 }
3008         }
3009         return candidate;
3010 }
3011
3012 #ifdef CONFIG_MODULES
3013 static int nft_expr_type_request_module(struct net *net, u8 family,
3014                                         struct nlattr *nla)
3015 {
3016         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3017                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3018                 return -EAGAIN;
3019
3020         return 0;
3021 }
3022 #endif
3023
3024 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3025                                                      u8 family,
3026                                                      struct nlattr *nla)
3027 {
3028         const struct nft_expr_type *type;
3029
3030         if (nla == NULL)
3031                 return ERR_PTR(-EINVAL);
3032
3033         type = __nft_expr_type_get(family, nla);
3034         if (type != NULL && try_module_get(type->owner))
3035                 return type;
3036
3037         lockdep_nfnl_nft_mutex_not_held();
3038 #ifdef CONFIG_MODULES
3039         if (type == NULL) {
3040                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3041                         return ERR_PTR(-EAGAIN);
3042
3043                 if (nft_request_module(net, "nft-expr-%.*s",
3044                                        nla_len(nla),
3045                                        (char *)nla_data(nla)) == -EAGAIN)
3046                         return ERR_PTR(-EAGAIN);
3047         }
3048 #endif
3049         return ERR_PTR(-ENOENT);
3050 }
3051
3052 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3053         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
3054                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
3055         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
3056 };
3057
3058 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3059                                     const struct nft_expr *expr, bool reset)
3060 {
3061         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3062                 goto nla_put_failure;
3063
3064         if (expr->ops->dump) {
3065                 struct nlattr *data = nla_nest_start_noflag(skb,
3066                                                             NFTA_EXPR_DATA);
3067                 if (data == NULL)
3068                         goto nla_put_failure;
3069                 if (expr->ops->dump(skb, expr, reset) < 0)
3070                         goto nla_put_failure;
3071                 nla_nest_end(skb, data);
3072         }
3073
3074         return skb->len;
3075
3076 nla_put_failure:
3077         return -1;
3078 };
3079
3080 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3081                   const struct nft_expr *expr, bool reset)
3082 {
3083         struct nlattr *nest;
3084
3085         nest = nla_nest_start_noflag(skb, attr);
3086         if (!nest)
3087                 goto nla_put_failure;
3088         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3089                 goto nla_put_failure;
3090         nla_nest_end(skb, nest);
3091         return 0;
3092
3093 nla_put_failure:
3094         return -1;
3095 }
3096
3097 struct nft_expr_info {
3098         const struct nft_expr_ops       *ops;
3099         const struct nlattr             *attr;
3100         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
3101 };
3102
3103 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3104                                 const struct nlattr *nla,
3105                                 struct nft_expr_info *info)
3106 {
3107         const struct nft_expr_type *type;
3108         const struct nft_expr_ops *ops;
3109         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3110         int err;
3111
3112         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3113                                           nft_expr_policy, NULL);
3114         if (err < 0)
3115                 return err;
3116
3117         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3118         if (IS_ERR(type))
3119                 return PTR_ERR(type);
3120
3121         if (tb[NFTA_EXPR_DATA]) {
3122                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3123                                                   tb[NFTA_EXPR_DATA],
3124                                                   type->policy, NULL);
3125                 if (err < 0)
3126                         goto err1;
3127         } else
3128                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3129
3130         if (type->select_ops != NULL) {
3131                 ops = type->select_ops(ctx,
3132                                        (const struct nlattr * const *)info->tb);
3133                 if (IS_ERR(ops)) {
3134                         err = PTR_ERR(ops);
3135 #ifdef CONFIG_MODULES
3136                         if (err == -EAGAIN)
3137                                 if (nft_expr_type_request_module(ctx->net,
3138                                                                  ctx->family,
3139                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
3140                                         err = -ENOENT;
3141 #endif
3142                         goto err1;
3143                 }
3144         } else
3145                 ops = type->ops;
3146
3147         info->attr = nla;
3148         info->ops = ops;
3149
3150         return 0;
3151
3152 err1:
3153         module_put(type->owner);
3154         return err;
3155 }
3156
3157 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3158                          struct nft_expr_info *info)
3159 {
3160         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3161         const struct nft_expr_type *type;
3162         int err;
3163
3164         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3165                                           nft_expr_policy, NULL);
3166         if (err < 0)
3167                 return err;
3168
3169         if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3170                 return -EINVAL;
3171
3172         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3173         if (!type)
3174                 return -ENOENT;
3175
3176         if (!type->inner_ops)
3177                 return -EOPNOTSUPP;
3178
3179         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3180                                           tb[NFTA_EXPR_DATA],
3181                                           type->policy, NULL);
3182         if (err < 0)
3183                 goto err_nla_parse;
3184
3185         info->attr = nla;
3186         info->ops = type->inner_ops;
3187
3188         return 0;
3189
3190 err_nla_parse:
3191         return err;
3192 }
3193
3194 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3195                              const struct nft_expr_info *expr_info,
3196                              struct nft_expr *expr)
3197 {
3198         const struct nft_expr_ops *ops = expr_info->ops;
3199         int err;
3200
3201         expr->ops = ops;
3202         if (ops->init) {
3203                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3204                 if (err < 0)
3205                         goto err1;
3206         }
3207
3208         return 0;
3209 err1:
3210         expr->ops = NULL;
3211         return err;
3212 }
3213
3214 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3215                                    struct nft_expr *expr)
3216 {
3217         const struct nft_expr_type *type = expr->ops->type;
3218
3219         if (expr->ops->destroy)
3220                 expr->ops->destroy(ctx, expr);
3221         module_put(type->owner);
3222 }
3223
3224 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3225                                       const struct nlattr *nla)
3226 {
3227         struct nft_expr_info expr_info;
3228         struct nft_expr *expr;
3229         struct module *owner;
3230         int err;
3231
3232         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3233         if (err < 0)
3234                 goto err_expr_parse;
3235
3236         err = -EOPNOTSUPP;
3237         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3238                 goto err_expr_stateful;
3239
3240         err = -ENOMEM;
3241         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3242         if (expr == NULL)
3243                 goto err_expr_stateful;
3244
3245         err = nf_tables_newexpr(ctx, &expr_info, expr);
3246         if (err < 0)
3247                 goto err_expr_new;
3248
3249         return expr;
3250 err_expr_new:
3251         kfree(expr);
3252 err_expr_stateful:
3253         owner = expr_info.ops->type->owner;
3254         if (expr_info.ops->type->release_ops)
3255                 expr_info.ops->type->release_ops(expr_info.ops);
3256
3257         module_put(owner);
3258 err_expr_parse:
3259         return ERR_PTR(err);
3260 }
3261
3262 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3263 {
3264         int err;
3265
3266         if (src->ops->clone) {
3267                 dst->ops = src->ops;
3268                 err = src->ops->clone(dst, src);
3269                 if (err < 0)
3270                         return err;
3271         } else {
3272                 memcpy(dst, src, src->ops->size);
3273         }
3274
3275         __module_get(src->ops->type->owner);
3276
3277         return 0;
3278 }
3279
3280 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3281 {
3282         nf_tables_expr_destroy(ctx, expr);
3283         kfree(expr);
3284 }
3285
3286 /*
3287  * Rules
3288  */
3289
3290 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3291                                           u64 handle)
3292 {
3293         struct nft_rule *rule;
3294
3295         // FIXME: this sucks
3296         list_for_each_entry_rcu(rule, &chain->rules, list) {
3297                 if (handle == rule->handle)
3298                         return rule;
3299         }
3300
3301         return ERR_PTR(-ENOENT);
3302 }
3303
3304 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3305                                         const struct nlattr *nla)
3306 {
3307         if (nla == NULL)
3308                 return ERR_PTR(-EINVAL);
3309
3310         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3311 }
3312
3313 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3314         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3315                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3316         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3317                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3318         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3319         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3320         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3321         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3322         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3323                                     .len = NFT_USERDATA_MAXLEN },
3324         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3325         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3326         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3327 };
3328
3329 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3330                                     u32 portid, u32 seq, int event,
3331                                     u32 flags, int family,
3332                                     const struct nft_table *table,
3333                                     const struct nft_chain *chain,
3334                                     const struct nft_rule *rule, u64 handle,
3335                                     bool reset)
3336 {
3337         struct nlmsghdr *nlh;
3338         const struct nft_expr *expr, *next;
3339         struct nlattr *list;
3340         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3341
3342         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3343                            nft_base_seq(net));
3344         if (!nlh)
3345                 goto nla_put_failure;
3346
3347         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3348                 goto nla_put_failure;
3349         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3350                 goto nla_put_failure;
3351         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3352                          NFTA_RULE_PAD))
3353                 goto nla_put_failure;
3354
3355         if (event != NFT_MSG_DELRULE && handle) {
3356                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3357                                  NFTA_RULE_PAD))
3358                         goto nla_put_failure;
3359         }
3360
3361         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3362                 nft_flow_rule_stats(chain, rule);
3363
3364         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3365         if (list == NULL)
3366                 goto nla_put_failure;
3367         nft_rule_for_each_expr(expr, next, rule) {
3368                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3369                         goto nla_put_failure;
3370         }
3371         nla_nest_end(skb, list);
3372
3373         if (rule->udata) {
3374                 struct nft_userdata *udata = nft_userdata(rule);
3375                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3376                             udata->data) < 0)
3377                         goto nla_put_failure;
3378         }
3379
3380         nlmsg_end(skb, nlh);
3381         return 0;
3382
3383 nla_put_failure:
3384         nlmsg_trim(skb, nlh);
3385         return -1;
3386 }
3387
3388 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3389                                   const struct nft_rule *rule, int event)
3390 {
3391         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3392         const struct nft_rule *prule;
3393         struct sk_buff *skb;
3394         u64 handle = 0;
3395         u16 flags = 0;
3396         int err;
3397
3398         if (!ctx->report &&
3399             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3400                 return;
3401
3402         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3403         if (skb == NULL)
3404                 goto err;
3405
3406         if (event == NFT_MSG_NEWRULE &&
3407             !list_is_first(&rule->list, &ctx->chain->rules) &&
3408             !list_is_last(&rule->list, &ctx->chain->rules)) {
3409                 prule = list_prev_entry(rule, list);
3410                 handle = prule->handle;
3411         }
3412         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3413                 flags |= NLM_F_APPEND;
3414         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3415                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3416
3417         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3418                                        event, flags, ctx->family, ctx->table,
3419                                        ctx->chain, rule, handle, false);
3420         if (err < 0) {
3421                 kfree_skb(skb);
3422                 goto err;
3423         }
3424
3425         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3426         return;
3427 err:
3428         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3429 }
3430
3431 static void audit_log_rule_reset(const struct nft_table *table,
3432                                  unsigned int base_seq,
3433                                  unsigned int nentries)
3434 {
3435         char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3436                               table->name, base_seq);
3437
3438         audit_log_nfcfg(buf, table->family, nentries,
3439                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3440         kfree(buf);
3441 }
3442
3443 struct nft_rule_dump_ctx {
3444         char *table;
3445         char *chain;
3446 };
3447
3448 static int __nf_tables_dump_rules(struct sk_buff *skb,
3449                                   unsigned int *idx,
3450                                   struct netlink_callback *cb,
3451                                   const struct nft_table *table,
3452                                   const struct nft_chain *chain,
3453                                   bool reset)
3454 {
3455         struct net *net = sock_net(skb->sk);
3456         const struct nft_rule *rule, *prule;
3457         unsigned int s_idx = cb->args[0];
3458         unsigned int entries = 0;
3459         int ret = 0;
3460         u64 handle;
3461
3462         prule = NULL;
3463         list_for_each_entry_rcu(rule, &chain->rules, list) {
3464                 if (!nft_is_active(net, rule))
3465                         goto cont_skip;
3466                 if (*idx < s_idx)
3467                         goto cont;
3468                 if (*idx > s_idx) {
3469                         memset(&cb->args[1], 0,
3470                                         sizeof(cb->args) - sizeof(cb->args[0]));
3471                 }
3472                 if (prule)
3473                         handle = prule->handle;
3474                 else
3475                         handle = 0;
3476
3477                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3478                                         cb->nlh->nlmsg_seq,
3479                                         NFT_MSG_NEWRULE,
3480                                         NLM_F_MULTI | NLM_F_APPEND,
3481                                         table->family,
3482                                         table, chain, rule, handle, reset) < 0) {
3483                         ret = 1;
3484                         break;
3485                 }
3486                 entries++;
3487                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3488 cont:
3489                 prule = rule;
3490 cont_skip:
3491                 (*idx)++;
3492         }
3493
3494         if (reset && entries)
3495                 audit_log_rule_reset(table, cb->seq, entries);
3496
3497         return ret;
3498 }
3499
3500 static int nf_tables_dump_rules(struct sk_buff *skb,
3501                                 struct netlink_callback *cb)
3502 {
3503         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3504         const struct nft_rule_dump_ctx *ctx = cb->data;
3505         struct nft_table *table;
3506         const struct nft_chain *chain;
3507         unsigned int idx = 0;
3508         struct net *net = sock_net(skb->sk);
3509         int family = nfmsg->nfgen_family;
3510         struct nftables_pernet *nft_net;
3511         bool reset = false;
3512
3513         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3514                 reset = true;
3515
3516         rcu_read_lock();
3517         nft_net = nft_pernet(net);
3518         cb->seq = READ_ONCE(nft_net->base_seq);
3519
3520         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3521                 if (family != NFPROTO_UNSPEC && family != table->family)
3522                         continue;
3523
3524                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3525                         continue;
3526
3527                 if (ctx && ctx->table && ctx->chain) {
3528                         struct rhlist_head *list, *tmp;
3529
3530                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3531                                                nft_chain_ht_params);
3532                         if (!list)
3533                                 goto done;
3534
3535                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3536                                 if (!nft_is_active(net, chain))
3537                                         continue;
3538                                 __nf_tables_dump_rules(skb, &idx,
3539                                                        cb, table, chain, reset);
3540                                 break;
3541                         }
3542                         goto done;
3543                 }
3544
3545                 list_for_each_entry_rcu(chain, &table->chains, list) {
3546                         if (__nf_tables_dump_rules(skb, &idx,
3547                                                    cb, table, chain, reset))
3548                                 goto done;
3549                 }
3550
3551                 if (ctx && ctx->table)
3552                         break;
3553         }
3554 done:
3555         rcu_read_unlock();
3556
3557         cb->args[0] = idx;
3558         return skb->len;
3559 }
3560
3561 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3562 {
3563         const struct nlattr * const *nla = cb->data;
3564         struct nft_rule_dump_ctx *ctx = NULL;
3565
3566         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3567                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3568                 if (!ctx)
3569                         return -ENOMEM;
3570
3571                 if (nla[NFTA_RULE_TABLE]) {
3572                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3573                                                         GFP_ATOMIC);
3574                         if (!ctx->table) {
3575                                 kfree(ctx);
3576                                 return -ENOMEM;
3577                         }
3578                 }
3579                 if (nla[NFTA_RULE_CHAIN]) {
3580                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3581                                                 GFP_ATOMIC);
3582                         if (!ctx->chain) {
3583                                 kfree(ctx->table);
3584                                 kfree(ctx);
3585                                 return -ENOMEM;
3586                         }
3587                 }
3588         }
3589
3590         cb->data = ctx;
3591         return 0;
3592 }
3593
3594 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3595 {
3596         struct nft_rule_dump_ctx *ctx = cb->data;
3597
3598         if (ctx) {
3599                 kfree(ctx->table);
3600                 kfree(ctx->chain);
3601                 kfree(ctx);
3602         }
3603         return 0;
3604 }
3605
3606 /* called with rcu_read_lock held */
3607 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3608                              const struct nlattr * const nla[])
3609 {
3610         struct netlink_ext_ack *extack = info->extack;
3611         u8 genmask = nft_genmask_cur(info->net);
3612         u8 family = info->nfmsg->nfgen_family;
3613         const struct nft_chain *chain;
3614         const struct nft_rule *rule;
3615         struct net *net = info->net;
3616         struct nft_table *table;
3617         struct sk_buff *skb2;
3618         bool reset = false;
3619         int err;
3620
3621         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3622                 struct netlink_dump_control c = {
3623                         .start= nf_tables_dump_rules_start,
3624                         .dump = nf_tables_dump_rules,
3625                         .done = nf_tables_dump_rules_done,
3626                         .module = THIS_MODULE,
3627                         .data = (void *)nla,
3628                 };
3629
3630                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3631         }
3632
3633         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3634         if (IS_ERR(table)) {
3635                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3636                 return PTR_ERR(table);
3637         }
3638
3639         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3640         if (IS_ERR(chain)) {
3641                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3642                 return PTR_ERR(chain);
3643         }
3644
3645         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3646         if (IS_ERR(rule)) {
3647                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3648                 return PTR_ERR(rule);
3649         }
3650
3651         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3652         if (!skb2)
3653                 return -ENOMEM;
3654
3655         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3656                 reset = true;
3657
3658         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3659                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3660                                        family, table, chain, rule, 0, reset);
3661         if (err < 0)
3662                 goto err_fill_rule_info;
3663
3664         if (reset)
3665                 audit_log_rule_reset(table, nft_pernet(net)->base_seq, 1);
3666
3667         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3668
3669 err_fill_rule_info:
3670         kfree_skb(skb2);
3671         return err;
3672 }
3673
3674 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3675 {
3676         struct nft_expr *expr, *next;
3677
3678         /*
3679          * Careful: some expressions might not be initialized in case this
3680          * is called on error from nf_tables_newrule().
3681          */
3682         expr = nft_expr_first(rule);
3683         while (nft_expr_more(rule, expr)) {
3684                 next = nft_expr_next(expr);
3685                 nf_tables_expr_destroy(ctx, expr);
3686                 expr = next;
3687         }
3688         kfree(rule);
3689 }
3690
3691 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3692 {
3693         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3694         nf_tables_rule_destroy(ctx, rule);
3695 }
3696
3697 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3698 {
3699         struct nft_expr *expr, *last;
3700         const struct nft_data *data;
3701         struct nft_rule *rule;
3702         int err;
3703
3704         if (ctx->level == NFT_JUMP_STACK_SIZE)
3705                 return -EMLINK;
3706
3707         list_for_each_entry(rule, &chain->rules, list) {
3708                 if (fatal_signal_pending(current))
3709                         return -EINTR;
3710
3711                 if (!nft_is_active_next(ctx->net, rule))
3712                         continue;
3713
3714                 nft_rule_for_each_expr(expr, last, rule) {
3715                         if (!expr->ops->validate)
3716                                 continue;
3717
3718                         err = expr->ops->validate(ctx, expr, &data);
3719                         if (err < 0)
3720                                 return err;
3721                 }
3722         }
3723
3724         return 0;
3725 }
3726 EXPORT_SYMBOL_GPL(nft_chain_validate);
3727
3728 static int nft_table_validate(struct net *net, const struct nft_table *table)
3729 {
3730         struct nft_chain *chain;
3731         struct nft_ctx ctx = {
3732                 .net    = net,
3733                 .family = table->family,
3734         };
3735         int err;
3736
3737         list_for_each_entry(chain, &table->chains, list) {
3738                 if (!nft_is_base_chain(chain))
3739                         continue;
3740
3741                 ctx.chain = chain;
3742                 err = nft_chain_validate(&ctx, chain);
3743                 if (err < 0)
3744                         return err;
3745
3746                 cond_resched();
3747         }
3748
3749         return 0;
3750 }
3751
3752 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3753                          const struct nft_set_iter *iter,
3754                          struct nft_set_elem *elem)
3755 {
3756         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3757         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3758         const struct nft_data *data;
3759         int err;
3760
3761         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3762             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3763                 return 0;
3764
3765         data = nft_set_ext_data(ext);
3766         switch (data->verdict.code) {
3767         case NFT_JUMP:
3768         case NFT_GOTO:
3769                 pctx->level++;
3770                 err = nft_chain_validate(ctx, data->verdict.chain);
3771                 if (err < 0)
3772                         return err;
3773                 pctx->level--;
3774                 break;
3775         default:
3776                 break;
3777         }
3778
3779         return 0;
3780 }
3781
3782 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3783 {
3784         u8 genmask = nft_genmask_next(ctx->net);
3785         struct nft_set_elem_catchall *catchall;
3786         struct nft_set_elem elem;
3787         struct nft_set_ext *ext;
3788         int ret = 0;
3789
3790         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3791                 ext = nft_set_elem_ext(set, catchall->elem);
3792                 if (!nft_set_elem_active(ext, genmask))
3793                         continue;
3794
3795                 elem.priv = catchall->elem;
3796                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3797                 if (ret < 0)
3798                         return ret;
3799         }
3800
3801         return ret;
3802 }
3803
3804 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3805                                              const struct nft_chain *chain,
3806                                              const struct nlattr *nla);
3807
3808 #define NFT_RULE_MAXEXPRS       128
3809
3810 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3811                              const struct nlattr * const nla[])
3812 {
3813         struct nftables_pernet *nft_net = nft_pernet(info->net);
3814         struct netlink_ext_ack *extack = info->extack;
3815         unsigned int size, i, n, ulen = 0, usize = 0;
3816         u8 genmask = nft_genmask_next(info->net);
3817         struct nft_rule *rule, *old_rule = NULL;
3818         struct nft_expr_info *expr_info = NULL;
3819         u8 family = info->nfmsg->nfgen_family;
3820         struct nft_flow_rule *flow = NULL;
3821         struct net *net = info->net;
3822         struct nft_userdata *udata;
3823         struct nft_table *table;
3824         struct nft_chain *chain;
3825         struct nft_trans *trans;
3826         u64 handle, pos_handle;
3827         struct nft_expr *expr;
3828         struct nft_ctx ctx;
3829         struct nlattr *tmp;
3830         int err, rem;
3831
3832         lockdep_assert_held(&nft_net->commit_mutex);
3833
3834         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3835                                  NETLINK_CB(skb).portid);
3836         if (IS_ERR(table)) {
3837                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3838                 return PTR_ERR(table);
3839         }
3840
3841         if (nla[NFTA_RULE_CHAIN]) {
3842                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3843                                          genmask);
3844                 if (IS_ERR(chain)) {
3845                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3846                         return PTR_ERR(chain);
3847                 }
3848
3849         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3850                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3851                                               genmask);
3852                 if (IS_ERR(chain)) {
3853                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3854                         return PTR_ERR(chain);
3855                 }
3856         } else {
3857                 return -EINVAL;
3858         }
3859
3860         if (nft_chain_is_bound(chain))
3861                 return -EOPNOTSUPP;
3862
3863         if (nla[NFTA_RULE_HANDLE]) {
3864                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3865                 rule = __nft_rule_lookup(chain, handle);
3866                 if (IS_ERR(rule)) {
3867                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3868                         return PTR_ERR(rule);
3869                 }
3870
3871                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3872                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3873                         return -EEXIST;
3874                 }
3875                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3876                         old_rule = rule;
3877                 else
3878                         return -EOPNOTSUPP;
3879         } else {
3880                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3881                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3882                         return -EINVAL;
3883                 handle = nf_tables_alloc_handle(table);
3884
3885                 if (nla[NFTA_RULE_POSITION]) {
3886                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3887                         old_rule = __nft_rule_lookup(chain, pos_handle);
3888                         if (IS_ERR(old_rule)) {
3889                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3890                                 return PTR_ERR(old_rule);
3891                         }
3892                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3893                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3894                         if (IS_ERR(old_rule)) {
3895                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3896                                 return PTR_ERR(old_rule);
3897                         }
3898                 }
3899         }
3900
3901         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3902
3903         n = 0;
3904         size = 0;
3905         if (nla[NFTA_RULE_EXPRESSIONS]) {
3906                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3907                                            sizeof(struct nft_expr_info),
3908                                            GFP_KERNEL);
3909                 if (!expr_info)
3910                         return -ENOMEM;
3911
3912                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3913                         err = -EINVAL;
3914                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3915                                 goto err_release_expr;
3916                         if (n == NFT_RULE_MAXEXPRS)
3917                                 goto err_release_expr;
3918                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3919                         if (err < 0) {
3920                                 NL_SET_BAD_ATTR(extack, tmp);
3921                                 goto err_release_expr;
3922                         }
3923                         size += expr_info[n].ops->size;
3924                         n++;
3925                 }
3926         }
3927         /* Check for overflow of dlen field */
3928         err = -EFBIG;
3929         if (size >= 1 << 12)
3930                 goto err_release_expr;
3931
3932         if (nla[NFTA_RULE_USERDATA]) {
3933                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3934                 if (ulen > 0)
3935                         usize = sizeof(struct nft_userdata) + ulen;
3936         }
3937
3938         err = -ENOMEM;
3939         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3940         if (rule == NULL)
3941                 goto err_release_expr;
3942
3943         nft_activate_next(net, rule);
3944
3945         rule->handle = handle;
3946         rule->dlen   = size;
3947         rule->udata  = ulen ? 1 : 0;
3948
3949         if (ulen) {
3950                 udata = nft_userdata(rule);
3951                 udata->len = ulen - 1;
3952                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3953         }
3954
3955         expr = nft_expr_first(rule);
3956         for (i = 0; i < n; i++) {
3957                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3958                 if (err < 0) {
3959                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3960                         goto err_release_rule;
3961                 }
3962
3963                 if (expr_info[i].ops->validate)
3964                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
3965
3966                 expr_info[i].ops = NULL;
3967                 expr = nft_expr_next(expr);
3968         }
3969
3970         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3971                 flow = nft_flow_rule_create(net, rule);
3972                 if (IS_ERR(flow)) {
3973                         err = PTR_ERR(flow);
3974                         goto err_release_rule;
3975                 }
3976         }
3977
3978         if (!nft_use_inc(&chain->use)) {
3979                 err = -EMFILE;
3980                 goto err_release_rule;
3981         }
3982
3983         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3984                 if (nft_chain_binding(chain)) {
3985                         err = -EOPNOTSUPP;
3986                         goto err_destroy_flow_rule;
3987                 }
3988
3989                 err = nft_delrule(&ctx, old_rule);
3990                 if (err < 0)
3991                         goto err_destroy_flow_rule;
3992
3993                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3994                 if (trans == NULL) {
3995                         err = -ENOMEM;
3996                         goto err_destroy_flow_rule;
3997                 }
3998                 list_add_tail_rcu(&rule->list, &old_rule->list);
3999         } else {
4000                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4001                 if (!trans) {
4002                         err = -ENOMEM;
4003                         goto err_destroy_flow_rule;
4004                 }
4005
4006                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4007                         if (old_rule)
4008                                 list_add_rcu(&rule->list, &old_rule->list);
4009                         else
4010                                 list_add_tail_rcu(&rule->list, &chain->rules);
4011                  } else {
4012                         if (old_rule)
4013                                 list_add_tail_rcu(&rule->list, &old_rule->list);
4014                         else
4015                                 list_add_rcu(&rule->list, &chain->rules);
4016                 }
4017         }
4018         kvfree(expr_info);
4019
4020         if (flow)
4021                 nft_trans_flow_rule(trans) = flow;
4022
4023         if (table->validate_state == NFT_VALIDATE_DO)
4024                 return nft_table_validate(net, table);
4025
4026         return 0;
4027
4028 err_destroy_flow_rule:
4029         nft_use_dec_restore(&chain->use);
4030         if (flow)
4031                 nft_flow_rule_destroy(flow);
4032 err_release_rule:
4033         nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4034         nf_tables_rule_destroy(&ctx, rule);
4035 err_release_expr:
4036         for (i = 0; i < n; i++) {
4037                 if (expr_info[i].ops) {
4038                         module_put(expr_info[i].ops->type->owner);
4039                         if (expr_info[i].ops->type->release_ops)
4040                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4041                 }
4042         }
4043         kvfree(expr_info);
4044
4045         return err;
4046 }
4047
4048 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4049                                              const struct nft_chain *chain,
4050                                              const struct nlattr *nla)
4051 {
4052         struct nftables_pernet *nft_net = nft_pernet(net);
4053         u32 id = ntohl(nla_get_be32(nla));
4054         struct nft_trans *trans;
4055
4056         list_for_each_entry(trans, &nft_net->commit_list, list) {
4057                 if (trans->msg_type == NFT_MSG_NEWRULE &&
4058                     trans->ctx.chain == chain &&
4059                     id == nft_trans_rule_id(trans))
4060                         return nft_trans_rule(trans);
4061         }
4062         return ERR_PTR(-ENOENT);
4063 }
4064
4065 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4066                              const struct nlattr * const nla[])
4067 {
4068         struct netlink_ext_ack *extack = info->extack;
4069         u8 genmask = nft_genmask_next(info->net);
4070         u8 family = info->nfmsg->nfgen_family;
4071         struct nft_chain *chain = NULL;
4072         struct net *net = info->net;
4073         struct nft_table *table;
4074         struct nft_rule *rule;
4075         struct nft_ctx ctx;
4076         int err = 0;
4077
4078         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4079                                  NETLINK_CB(skb).portid);
4080         if (IS_ERR(table)) {
4081                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4082                 return PTR_ERR(table);
4083         }
4084
4085         if (nla[NFTA_RULE_CHAIN]) {
4086                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4087                                          genmask);
4088                 if (IS_ERR(chain)) {
4089                         if (PTR_ERR(chain) == -ENOENT &&
4090                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4091                                 return 0;
4092
4093                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4094                         return PTR_ERR(chain);
4095                 }
4096                 if (nft_chain_binding(chain))
4097                         return -EOPNOTSUPP;
4098         }
4099
4100         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4101
4102         if (chain) {
4103                 if (nla[NFTA_RULE_HANDLE]) {
4104                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4105                         if (IS_ERR(rule)) {
4106                                 if (PTR_ERR(rule) == -ENOENT &&
4107                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4108                                         return 0;
4109
4110                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4111                                 return PTR_ERR(rule);
4112                         }
4113
4114                         err = nft_delrule(&ctx, rule);
4115                 } else if (nla[NFTA_RULE_ID]) {
4116                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4117                         if (IS_ERR(rule)) {
4118                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4119                                 return PTR_ERR(rule);
4120                         }
4121
4122                         err = nft_delrule(&ctx, rule);
4123                 } else {
4124                         err = nft_delrule_by_chain(&ctx);
4125                 }
4126         } else {
4127                 list_for_each_entry(chain, &table->chains, list) {
4128                         if (!nft_is_active_next(net, chain))
4129                                 continue;
4130                         if (nft_chain_binding(chain))
4131                                 continue;
4132
4133                         ctx.chain = chain;
4134                         err = nft_delrule_by_chain(&ctx);
4135                         if (err < 0)
4136                                 break;
4137                 }
4138         }
4139
4140         return err;
4141 }
4142
4143 /*
4144  * Sets
4145  */
4146 static const struct nft_set_type *nft_set_types[] = {
4147         &nft_set_hash_fast_type,
4148         &nft_set_hash_type,
4149         &nft_set_rhash_type,
4150         &nft_set_bitmap_type,
4151         &nft_set_rbtree_type,
4152 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4153         &nft_set_pipapo_avx2_type,
4154 #endif
4155         &nft_set_pipapo_type,
4156 };
4157
4158 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
4159                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4160                                  NFT_SET_EVAL)
4161
4162 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4163 {
4164         return (flags & type->features) == (flags & NFT_SET_FEATURES);
4165 }
4166
4167 /*
4168  * Select a set implementation based on the data characteristics and the
4169  * given policy. The total memory use might not be known if no size is
4170  * given, in that case the amount of memory per element is used.
4171  */
4172 static const struct nft_set_ops *
4173 nft_select_set_ops(const struct nft_ctx *ctx,
4174                    const struct nlattr * const nla[],
4175                    const struct nft_set_desc *desc)
4176 {
4177         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4178         const struct nft_set_ops *ops, *bops;
4179         struct nft_set_estimate est, best;
4180         const struct nft_set_type *type;
4181         u32 flags = 0;
4182         int i;
4183
4184         lockdep_assert_held(&nft_net->commit_mutex);
4185         lockdep_nfnl_nft_mutex_not_held();
4186
4187         if (nla[NFTA_SET_FLAGS] != NULL)
4188                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4189
4190         bops        = NULL;
4191         best.size   = ~0;
4192         best.lookup = ~0;
4193         best.space  = ~0;
4194
4195         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4196                 type = nft_set_types[i];
4197                 ops = &type->ops;
4198
4199                 if (!nft_set_ops_candidate(type, flags))
4200                         continue;
4201                 if (!ops->estimate(desc, flags, &est))
4202                         continue;
4203
4204                 switch (desc->policy) {
4205                 case NFT_SET_POL_PERFORMANCE:
4206                         if (est.lookup < best.lookup)
4207                                 break;
4208                         if (est.lookup == best.lookup &&
4209                             est.space < best.space)
4210                                 break;
4211                         continue;
4212                 case NFT_SET_POL_MEMORY:
4213                         if (!desc->size) {
4214                                 if (est.space < best.space)
4215                                         break;
4216                                 if (est.space == best.space &&
4217                                     est.lookup < best.lookup)
4218                                         break;
4219                         } else if (est.size < best.size || !bops) {
4220                                 break;
4221                         }
4222                         continue;
4223                 default:
4224                         break;
4225                 }
4226
4227                 bops = ops;
4228                 best = est;
4229         }
4230
4231         if (bops != NULL)
4232                 return bops;
4233
4234         return ERR_PTR(-EOPNOTSUPP);
4235 }
4236
4237 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4238         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4239                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4240         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4241                                             .len = NFT_SET_MAXNAMELEN - 1 },
4242         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4243         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4244         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4245         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4246         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4247         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4248         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4249         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4250         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4251         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4252         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4253                                             .len  = NFT_USERDATA_MAXLEN },
4254         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4255         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4256         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4257         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
4258 };
4259
4260 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4261         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4262         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
4263 };
4264
4265 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4266                                       const struct nlattr *nla, u8 genmask)
4267 {
4268         struct nft_set *set;
4269
4270         if (nla == NULL)
4271                 return ERR_PTR(-EINVAL);
4272
4273         list_for_each_entry_rcu(set, &table->sets, list) {
4274                 if (!nla_strcmp(nla, set->name) &&
4275                     nft_active_genmask(set, genmask))
4276                         return set;
4277         }
4278         return ERR_PTR(-ENOENT);
4279 }
4280
4281 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4282                                                const struct nlattr *nla,
4283                                                u8 genmask)
4284 {
4285         struct nft_set *set;
4286
4287         list_for_each_entry(set, &table->sets, list) {
4288                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4289                     nft_active_genmask(set, genmask))
4290                         return set;
4291         }
4292         return ERR_PTR(-ENOENT);
4293 }
4294
4295 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4296                                            const struct nft_table *table,
4297                                            const struct nlattr *nla, u8 genmask)
4298 {
4299         struct nftables_pernet *nft_net = nft_pernet(net);
4300         u32 id = ntohl(nla_get_be32(nla));
4301         struct nft_trans *trans;
4302
4303         list_for_each_entry(trans, &nft_net->commit_list, list) {
4304                 if (trans->msg_type == NFT_MSG_NEWSET) {
4305                         struct nft_set *set = nft_trans_set(trans);
4306
4307                         if (id == nft_trans_set_id(trans) &&
4308                             set->table == table &&
4309                             nft_active_genmask(set, genmask))
4310                                 return set;
4311                 }
4312         }
4313         return ERR_PTR(-ENOENT);
4314 }
4315
4316 struct nft_set *nft_set_lookup_global(const struct net *net,
4317                                       const struct nft_table *table,
4318                                       const struct nlattr *nla_set_name,
4319                                       const struct nlattr *nla_set_id,
4320                                       u8 genmask)
4321 {
4322         struct nft_set *set;
4323
4324         set = nft_set_lookup(table, nla_set_name, genmask);
4325         if (IS_ERR(set)) {
4326                 if (!nla_set_id)
4327                         return set;
4328
4329                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4330         }
4331         return set;
4332 }
4333 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4334
4335 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4336                                     const char *name)
4337 {
4338         const struct nft_set *i;
4339         const char *p;
4340         unsigned long *inuse;
4341         unsigned int n = 0, min = 0;
4342
4343         p = strchr(name, '%');
4344         if (p != NULL) {
4345                 if (p[1] != 'd' || strchr(p + 2, '%'))
4346                         return -EINVAL;
4347
4348                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4349                 if (inuse == NULL)
4350                         return -ENOMEM;
4351 cont:
4352                 list_for_each_entry(i, &ctx->table->sets, list) {
4353                         int tmp;
4354
4355                         if (!nft_is_active_next(ctx->net, i))
4356                                 continue;
4357                         if (!sscanf(i->name, name, &tmp))
4358                                 continue;
4359                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4360                                 continue;
4361
4362                         set_bit(tmp - min, inuse);
4363                 }
4364
4365                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4366                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4367                         min += BITS_PER_BYTE * PAGE_SIZE;
4368                         memset(inuse, 0, PAGE_SIZE);
4369                         goto cont;
4370                 }
4371                 free_page((unsigned long)inuse);
4372         }
4373
4374         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4375         if (!set->name)
4376                 return -ENOMEM;
4377
4378         list_for_each_entry(i, &ctx->table->sets, list) {
4379                 if (!nft_is_active_next(ctx->net, i))
4380                         continue;
4381                 if (!strcmp(set->name, i->name)) {
4382                         kfree(set->name);
4383                         set->name = NULL;
4384                         return -ENFILE;
4385                 }
4386         }
4387         return 0;
4388 }
4389
4390 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4391 {
4392         u64 ms = be64_to_cpu(nla_get_be64(nla));
4393         u64 max = (u64)(~((u64)0));
4394
4395         max = div_u64(max, NSEC_PER_MSEC);
4396         if (ms >= max)
4397                 return -ERANGE;
4398
4399         ms *= NSEC_PER_MSEC;
4400         *result = nsecs_to_jiffies64(ms);
4401         return 0;
4402 }
4403
4404 __be64 nf_jiffies64_to_msecs(u64 input)
4405 {
4406         return cpu_to_be64(jiffies64_to_msecs(input));
4407 }
4408
4409 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4410                                      const struct nft_set *set)
4411 {
4412         struct nlattr *concat, *field;
4413         int i;
4414
4415         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4416         if (!concat)
4417                 return -ENOMEM;
4418
4419         for (i = 0; i < set->field_count; i++) {
4420                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4421                 if (!field)
4422                         return -ENOMEM;
4423
4424                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4425                                  htonl(set->field_len[i])))
4426                         return -ENOMEM;
4427
4428                 nla_nest_end(skb, field);
4429         }
4430
4431         nla_nest_end(skb, concat);
4432
4433         return 0;
4434 }
4435
4436 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4437                               const struct nft_set *set, u16 event, u16 flags)
4438 {
4439         u64 timeout = READ_ONCE(set->timeout);
4440         u32 gc_int = READ_ONCE(set->gc_int);
4441         u32 portid = ctx->portid;
4442         struct nlmsghdr *nlh;
4443         struct nlattr *nest;
4444         u32 seq = ctx->seq;
4445         int i;
4446
4447         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4448         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4449                            NFNETLINK_V0, nft_base_seq(ctx->net));
4450         if (!nlh)
4451                 goto nla_put_failure;
4452
4453         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4454                 goto nla_put_failure;
4455         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4456                 goto nla_put_failure;
4457         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4458                          NFTA_SET_PAD))
4459                 goto nla_put_failure;
4460
4461         if (event == NFT_MSG_DELSET) {
4462                 nlmsg_end(skb, nlh);
4463                 return 0;
4464         }
4465
4466         if (set->flags != 0)
4467                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4468                         goto nla_put_failure;
4469
4470         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4471                 goto nla_put_failure;
4472         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4473                 goto nla_put_failure;
4474         if (set->flags & NFT_SET_MAP) {
4475                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4476                         goto nla_put_failure;
4477                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4478                         goto nla_put_failure;
4479         }
4480         if (set->flags & NFT_SET_OBJECT &&
4481             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4482                 goto nla_put_failure;
4483
4484         if (timeout &&
4485             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4486                          nf_jiffies64_to_msecs(timeout),
4487                          NFTA_SET_PAD))
4488                 goto nla_put_failure;
4489         if (gc_int &&
4490             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4491                 goto nla_put_failure;
4492
4493         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4494                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4495                         goto nla_put_failure;
4496         }
4497
4498         if (set->udata &&
4499             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4500                 goto nla_put_failure;
4501
4502         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4503         if (!nest)
4504                 goto nla_put_failure;
4505         if (set->size &&
4506             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4507                 goto nla_put_failure;
4508
4509         if (set->field_count > 1 &&
4510             nf_tables_fill_set_concat(skb, set))
4511                 goto nla_put_failure;
4512
4513         nla_nest_end(skb, nest);
4514
4515         if (set->num_exprs == 1) {
4516                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4517                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4518                         goto nla_put_failure;
4519
4520                 nla_nest_end(skb, nest);
4521         } else if (set->num_exprs > 1) {
4522                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4523                 if (nest == NULL)
4524                         goto nla_put_failure;
4525
4526                 for (i = 0; i < set->num_exprs; i++) {
4527                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4528                                           set->exprs[i], false) < 0)
4529                                 goto nla_put_failure;
4530                 }
4531                 nla_nest_end(skb, nest);
4532         }
4533
4534         nlmsg_end(skb, nlh);
4535         return 0;
4536
4537 nla_put_failure:
4538         nlmsg_trim(skb, nlh);
4539         return -1;
4540 }
4541
4542 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4543                                  const struct nft_set *set, int event,
4544                                  gfp_t gfp_flags)
4545 {
4546         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4547         u32 portid = ctx->portid;
4548         struct sk_buff *skb;
4549         u16 flags = 0;
4550         int err;
4551
4552         if (!ctx->report &&
4553             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4554                 return;
4555
4556         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4557         if (skb == NULL)
4558                 goto err;
4559
4560         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4561                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4562
4563         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4564         if (err < 0) {
4565                 kfree_skb(skb);
4566                 goto err;
4567         }
4568
4569         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4570         return;
4571 err:
4572         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4573 }
4574
4575 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4576 {
4577         const struct nft_set *set;
4578         unsigned int idx, s_idx = cb->args[0];
4579         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4580         struct net *net = sock_net(skb->sk);
4581         struct nft_ctx *ctx = cb->data, ctx_set;
4582         struct nftables_pernet *nft_net;
4583
4584         if (cb->args[1])
4585                 return skb->len;
4586
4587         rcu_read_lock();
4588         nft_net = nft_pernet(net);
4589         cb->seq = READ_ONCE(nft_net->base_seq);
4590
4591         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4592                 if (ctx->family != NFPROTO_UNSPEC &&
4593                     ctx->family != table->family)
4594                         continue;
4595
4596                 if (ctx->table && ctx->table != table)
4597                         continue;
4598
4599                 if (cur_table) {
4600                         if (cur_table != table)
4601                                 continue;
4602
4603                         cur_table = NULL;
4604                 }
4605                 idx = 0;
4606                 list_for_each_entry_rcu(set, &table->sets, list) {
4607                         if (idx < s_idx)
4608                                 goto cont;
4609                         if (!nft_is_active(net, set))
4610                                 goto cont;
4611
4612                         ctx_set = *ctx;
4613                         ctx_set.table = table;
4614                         ctx_set.family = table->family;
4615
4616                         if (nf_tables_fill_set(skb, &ctx_set, set,
4617                                                NFT_MSG_NEWSET,
4618                                                NLM_F_MULTI) < 0) {
4619                                 cb->args[0] = idx;
4620                                 cb->args[2] = (unsigned long) table;
4621                                 goto done;
4622                         }
4623                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4624 cont:
4625                         idx++;
4626                 }
4627                 if (s_idx)
4628                         s_idx = 0;
4629         }
4630         cb->args[1] = 1;
4631 done:
4632         rcu_read_unlock();
4633         return skb->len;
4634 }
4635
4636 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4637 {
4638         struct nft_ctx *ctx_dump = NULL;
4639
4640         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4641         if (ctx_dump == NULL)
4642                 return -ENOMEM;
4643
4644         cb->data = ctx_dump;
4645         return 0;
4646 }
4647
4648 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4649 {
4650         kfree(cb->data);
4651         return 0;
4652 }
4653
4654 /* called with rcu_read_lock held */
4655 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4656                             const struct nlattr * const nla[])
4657 {
4658         struct netlink_ext_ack *extack = info->extack;
4659         u8 genmask = nft_genmask_cur(info->net);
4660         u8 family = info->nfmsg->nfgen_family;
4661         struct nft_table *table = NULL;
4662         struct net *net = info->net;
4663         const struct nft_set *set;
4664         struct sk_buff *skb2;
4665         struct nft_ctx ctx;
4666         int err;
4667
4668         if (nla[NFTA_SET_TABLE]) {
4669                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4670                                          genmask, 0);
4671                 if (IS_ERR(table)) {
4672                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4673                         return PTR_ERR(table);
4674                 }
4675         }
4676
4677         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4678
4679         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4680                 struct netlink_dump_control c = {
4681                         .start = nf_tables_dump_sets_start,
4682                         .dump = nf_tables_dump_sets,
4683                         .done = nf_tables_dump_sets_done,
4684                         .data = &ctx,
4685                         .module = THIS_MODULE,
4686                 };
4687
4688                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4689         }
4690
4691         /* Only accept unspec with dump */
4692         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4693                 return -EAFNOSUPPORT;
4694         if (!nla[NFTA_SET_TABLE])
4695                 return -EINVAL;
4696
4697         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4698         if (IS_ERR(set))
4699                 return PTR_ERR(set);
4700
4701         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4702         if (skb2 == NULL)
4703                 return -ENOMEM;
4704
4705         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4706         if (err < 0)
4707                 goto err_fill_set_info;
4708
4709         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4710
4711 err_fill_set_info:
4712         kfree_skb(skb2);
4713         return err;
4714 }
4715
4716 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4717         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4718 };
4719
4720 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4721                                      struct nft_set_desc *desc)
4722 {
4723         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4724         u32 len;
4725         int err;
4726
4727         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4728                 return -E2BIG;
4729
4730         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4731                                           nft_concat_policy, NULL);
4732         if (err < 0)
4733                 return err;
4734
4735         if (!tb[NFTA_SET_FIELD_LEN])
4736                 return -EINVAL;
4737
4738         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4739         if (!len || len > U8_MAX)
4740                 return -EINVAL;
4741
4742         desc->field_len[desc->field_count++] = len;
4743
4744         return 0;
4745 }
4746
4747 static int nft_set_desc_concat(struct nft_set_desc *desc,
4748                                const struct nlattr *nla)
4749 {
4750         struct nlattr *attr;
4751         u32 num_regs = 0;
4752         int rem, err, i;
4753
4754         nla_for_each_nested(attr, nla, rem) {
4755                 if (nla_type(attr) != NFTA_LIST_ELEM)
4756                         return -EINVAL;
4757
4758                 err = nft_set_desc_concat_parse(attr, desc);
4759                 if (err < 0)
4760                         return err;
4761         }
4762
4763         for (i = 0; i < desc->field_count; i++)
4764                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4765
4766         if (num_regs > NFT_REG32_COUNT)
4767                 return -E2BIG;
4768
4769         return 0;
4770 }
4771
4772 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4773                                     const struct nlattr *nla)
4774 {
4775         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4776         int err;
4777
4778         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4779                                           nft_set_desc_policy, NULL);
4780         if (err < 0)
4781                 return err;
4782
4783         if (da[NFTA_SET_DESC_SIZE] != NULL)
4784                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4785         if (da[NFTA_SET_DESC_CONCAT])
4786                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4787
4788         return err;
4789 }
4790
4791 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4792                               const struct nlattr * const *nla,
4793                               struct nft_expr **exprs, int *num_exprs,
4794                               u32 flags)
4795 {
4796         struct nft_expr *expr;
4797         int err, i;
4798
4799         if (nla[NFTA_SET_EXPR]) {
4800                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4801                 if (IS_ERR(expr)) {
4802                         err = PTR_ERR(expr);
4803                         goto err_set_expr_alloc;
4804                 }
4805                 exprs[0] = expr;
4806                 (*num_exprs)++;
4807         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4808                 struct nlattr *tmp;
4809                 int left;
4810
4811                 if (!(flags & NFT_SET_EXPR)) {
4812                         err = -EINVAL;
4813                         goto err_set_expr_alloc;
4814                 }
4815                 i = 0;
4816                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4817                         if (i == NFT_SET_EXPR_MAX) {
4818                                 err = -E2BIG;
4819                                 goto err_set_expr_alloc;
4820                         }
4821                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4822                                 err = -EINVAL;
4823                                 goto err_set_expr_alloc;
4824                         }
4825                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4826                         if (IS_ERR(expr)) {
4827                                 err = PTR_ERR(expr);
4828                                 goto err_set_expr_alloc;
4829                         }
4830                         exprs[i++] = expr;
4831                         (*num_exprs)++;
4832                 }
4833         }
4834
4835         return 0;
4836
4837 err_set_expr_alloc:
4838         for (i = 0; i < *num_exprs; i++)
4839                 nft_expr_destroy(ctx, exprs[i]);
4840
4841         return err;
4842 }
4843
4844 static bool nft_set_is_same(const struct nft_set *set,
4845                             const struct nft_set_desc *desc,
4846                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4847 {
4848         int i;
4849
4850         if (set->ktype != desc->ktype ||
4851             set->dtype != desc->dtype ||
4852             set->flags != flags ||
4853             set->klen != desc->klen ||
4854             set->dlen != desc->dlen ||
4855             set->field_count != desc->field_count ||
4856             set->num_exprs != num_exprs)
4857                 return false;
4858
4859         for (i = 0; i < desc->field_count; i++) {
4860                 if (set->field_len[i] != desc->field_len[i])
4861                         return false;
4862         }
4863
4864         for (i = 0; i < num_exprs; i++) {
4865                 if (set->exprs[i]->ops != exprs[i]->ops)
4866                         return false;
4867         }
4868
4869         return true;
4870 }
4871
4872 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4873                             const struct nlattr * const nla[])
4874 {
4875         struct netlink_ext_ack *extack = info->extack;
4876         u8 genmask = nft_genmask_next(info->net);
4877         u8 family = info->nfmsg->nfgen_family;
4878         const struct nft_set_ops *ops;
4879         struct net *net = info->net;
4880         struct nft_set_desc desc;
4881         struct nft_table *table;
4882         unsigned char *udata;
4883         struct nft_set *set;
4884         struct nft_ctx ctx;
4885         size_t alloc_size;
4886         int num_exprs = 0;
4887         char *name;
4888         int err, i;
4889         u16 udlen;
4890         u32 flags;
4891         u64 size;
4892
4893         if (nla[NFTA_SET_TABLE] == NULL ||
4894             nla[NFTA_SET_NAME] == NULL ||
4895             nla[NFTA_SET_KEY_LEN] == NULL ||
4896             nla[NFTA_SET_ID] == NULL)
4897                 return -EINVAL;
4898
4899         memset(&desc, 0, sizeof(desc));
4900
4901         desc.ktype = NFT_DATA_VALUE;
4902         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4903                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4904                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4905                         return -EINVAL;
4906         }
4907
4908         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4909         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4910                 return -EINVAL;
4911
4912         flags = 0;
4913         if (nla[NFTA_SET_FLAGS] != NULL) {
4914                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4915                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4916                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4917                               NFT_SET_MAP | NFT_SET_EVAL |
4918                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4919                         return -EOPNOTSUPP;
4920                 /* Only one of these operations is supported */
4921                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4922                              (NFT_SET_MAP | NFT_SET_OBJECT))
4923                         return -EOPNOTSUPP;
4924                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4925                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4926                         return -EOPNOTSUPP;
4927         }
4928
4929         desc.dtype = 0;
4930         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4931                 if (!(flags & NFT_SET_MAP))
4932                         return -EINVAL;
4933
4934                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4935                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4936                     desc.dtype != NFT_DATA_VERDICT)
4937                         return -EINVAL;
4938
4939                 if (desc.dtype != NFT_DATA_VERDICT) {
4940                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4941                                 return -EINVAL;
4942                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4943                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4944                                 return -EINVAL;
4945                 } else
4946                         desc.dlen = sizeof(struct nft_verdict);
4947         } else if (flags & NFT_SET_MAP)
4948                 return -EINVAL;
4949
4950         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4951                 if (!(flags & NFT_SET_OBJECT))
4952                         return -EINVAL;
4953
4954                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4955                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4956                     desc.objtype > NFT_OBJECT_MAX)
4957                         return -EOPNOTSUPP;
4958         } else if (flags & NFT_SET_OBJECT)
4959                 return -EINVAL;
4960         else
4961                 desc.objtype = NFT_OBJECT_UNSPEC;
4962
4963         desc.timeout = 0;
4964         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4965                 if (!(flags & NFT_SET_TIMEOUT))
4966                         return -EINVAL;
4967
4968                 if (flags & NFT_SET_ANONYMOUS)
4969                         return -EOPNOTSUPP;
4970
4971                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4972                 if (err)
4973                         return err;
4974         }
4975         desc.gc_int = 0;
4976         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4977                 if (!(flags & NFT_SET_TIMEOUT))
4978                         return -EINVAL;
4979
4980                 if (flags & NFT_SET_ANONYMOUS)
4981                         return -EOPNOTSUPP;
4982
4983                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4984         }
4985
4986         desc.policy = NFT_SET_POL_PERFORMANCE;
4987         if (nla[NFTA_SET_POLICY] != NULL)
4988                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4989
4990         if (nla[NFTA_SET_DESC] != NULL) {
4991                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4992                 if (err < 0)
4993                         return err;
4994
4995                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4996                         return -EINVAL;
4997         } else if (flags & NFT_SET_CONCAT) {
4998                 return -EINVAL;
4999         }
5000
5001         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5002                 desc.expr = true;
5003
5004         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5005                                  NETLINK_CB(skb).portid);
5006         if (IS_ERR(table)) {
5007                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5008                 return PTR_ERR(table);
5009         }
5010
5011         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5012
5013         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5014         if (IS_ERR(set)) {
5015                 if (PTR_ERR(set) != -ENOENT) {
5016                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5017                         return PTR_ERR(set);
5018                 }
5019         } else {
5020                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5021
5022                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5023                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5024                         return -EEXIST;
5025                 }
5026                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5027                         return -EOPNOTSUPP;
5028
5029                 if (nft_set_is_anonymous(set))
5030                         return -EOPNOTSUPP;
5031
5032                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5033                 if (err < 0)
5034                         return err;
5035
5036                 err = 0;
5037                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5038                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5039                         err = -EEXIST;
5040                 }
5041
5042                 for (i = 0; i < num_exprs; i++)
5043                         nft_expr_destroy(&ctx, exprs[i]);
5044
5045                 if (err < 0)
5046                         return err;
5047
5048                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5049         }
5050
5051         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5052                 return -ENOENT;
5053
5054         ops = nft_select_set_ops(&ctx, nla, &desc);
5055         if (IS_ERR(ops))
5056                 return PTR_ERR(ops);
5057
5058         udlen = 0;
5059         if (nla[NFTA_SET_USERDATA])
5060                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5061
5062         size = 0;
5063         if (ops->privsize != NULL)
5064                 size = ops->privsize(nla, &desc);
5065         alloc_size = sizeof(*set) + size + udlen;
5066         if (alloc_size < size || alloc_size > INT_MAX)
5067                 return -ENOMEM;
5068
5069         if (!nft_use_inc(&table->use))
5070                 return -EMFILE;
5071
5072         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5073         if (!set) {
5074                 err = -ENOMEM;
5075                 goto err_alloc;
5076         }
5077
5078         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5079         if (!name) {
5080                 err = -ENOMEM;
5081                 goto err_set_name;
5082         }
5083
5084         err = nf_tables_set_alloc_name(&ctx, set, name);
5085         kfree(name);
5086         if (err < 0)
5087                 goto err_set_name;
5088
5089         udata = NULL;
5090         if (udlen) {
5091                 udata = set->data + size;
5092                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5093         }
5094
5095         INIT_LIST_HEAD(&set->bindings);
5096         INIT_LIST_HEAD(&set->catchall_list);
5097         refcount_set(&set->refs, 1);
5098         set->table = table;
5099         write_pnet(&set->net, net);
5100         set->ops = ops;
5101         set->ktype = desc.ktype;
5102         set->klen = desc.klen;
5103         set->dtype = desc.dtype;
5104         set->objtype = desc.objtype;
5105         set->dlen = desc.dlen;
5106         set->flags = flags;
5107         set->size = desc.size;
5108         set->policy = desc.policy;
5109         set->udlen = udlen;
5110         set->udata = udata;
5111         set->timeout = desc.timeout;
5112         set->gc_int = desc.gc_int;
5113
5114         set->field_count = desc.field_count;
5115         for (i = 0; i < desc.field_count; i++)
5116                 set->field_len[i] = desc.field_len[i];
5117
5118         err = ops->init(set, &desc, nla);
5119         if (err < 0)
5120                 goto err_set_init;
5121
5122         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5123         if (err < 0)
5124                 goto err_set_destroy;
5125
5126         set->num_exprs = num_exprs;
5127         set->handle = nf_tables_alloc_handle(table);
5128         INIT_LIST_HEAD(&set->pending_update);
5129
5130         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5131         if (err < 0)
5132                 goto err_set_expr_alloc;
5133
5134         list_add_tail_rcu(&set->list, &table->sets);
5135
5136         return 0;
5137
5138 err_set_expr_alloc:
5139         for (i = 0; i < set->num_exprs; i++)
5140                 nft_expr_destroy(&ctx, set->exprs[i]);
5141 err_set_destroy:
5142         ops->destroy(&ctx, set);
5143 err_set_init:
5144         kfree(set->name);
5145 err_set_name:
5146         kvfree(set);
5147 err_alloc:
5148         nft_use_dec_restore(&table->use);
5149
5150         return err;
5151 }
5152
5153 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5154                                      struct nft_set *set)
5155 {
5156         struct nft_set_elem_catchall *next, *catchall;
5157
5158         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5159                 list_del_rcu(&catchall->list);
5160                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5161                 kfree_rcu(catchall, rcu);
5162         }
5163 }
5164
5165 static void nft_set_put(struct nft_set *set)
5166 {
5167         if (refcount_dec_and_test(&set->refs)) {
5168                 kfree(set->name);
5169                 kvfree(set);
5170         }
5171 }
5172
5173 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5174 {
5175         int i;
5176
5177         if (WARN_ON(set->use > 0))
5178                 return;
5179
5180         for (i = 0; i < set->num_exprs; i++)
5181                 nft_expr_destroy(ctx, set->exprs[i]);
5182
5183         set->ops->destroy(ctx, set);
5184         nft_set_catchall_destroy(ctx, set);
5185         nft_set_put(set);
5186 }
5187
5188 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5189                             const struct nlattr * const nla[])
5190 {
5191         struct netlink_ext_ack *extack = info->extack;
5192         u8 genmask = nft_genmask_next(info->net);
5193         u8 family = info->nfmsg->nfgen_family;
5194         struct net *net = info->net;
5195         const struct nlattr *attr;
5196         struct nft_table *table;
5197         struct nft_set *set;
5198         struct nft_ctx ctx;
5199
5200         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5201                 return -EAFNOSUPPORT;
5202
5203         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5204                                  genmask, NETLINK_CB(skb).portid);
5205         if (IS_ERR(table)) {
5206                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5207                 return PTR_ERR(table);
5208         }
5209
5210         if (nla[NFTA_SET_HANDLE]) {
5211                 attr = nla[NFTA_SET_HANDLE];
5212                 set = nft_set_lookup_byhandle(table, attr, genmask);
5213         } else {
5214                 attr = nla[NFTA_SET_NAME];
5215                 set = nft_set_lookup(table, attr, genmask);
5216         }
5217
5218         if (IS_ERR(set)) {
5219                 if (PTR_ERR(set) == -ENOENT &&
5220                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5221                         return 0;
5222
5223                 NL_SET_BAD_ATTR(extack, attr);
5224                 return PTR_ERR(set);
5225         }
5226         if (set->use ||
5227             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5228              atomic_read(&set->nelems) > 0)) {
5229                 NL_SET_BAD_ATTR(extack, attr);
5230                 return -EBUSY;
5231         }
5232
5233         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5234
5235         return nft_delset(&ctx, set);
5236 }
5237
5238 static int nft_validate_register_store(const struct nft_ctx *ctx,
5239                                        enum nft_registers reg,
5240                                        const struct nft_data *data,
5241                                        enum nft_data_types type,
5242                                        unsigned int len);
5243
5244 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5245                                      struct nft_set *set,
5246                                      struct nft_set_elem *elem)
5247 {
5248         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5249         enum nft_registers dreg;
5250
5251         dreg = nft_type_to_reg(set->dtype);
5252         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5253                                            set->dtype == NFT_DATA_VERDICT ?
5254                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5255                                            set->dlen);
5256 }
5257
5258 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5259                                         struct nft_set *set,
5260                                         const struct nft_set_iter *iter,
5261                                         struct nft_set_elem *elem)
5262 {
5263         return nft_setelem_data_validate(ctx, set, elem);
5264 }
5265
5266 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5267                                        struct nft_set *set)
5268 {
5269         u8 genmask = nft_genmask_next(ctx->net);
5270         struct nft_set_elem_catchall *catchall;
5271         struct nft_set_elem elem;
5272         struct nft_set_ext *ext;
5273         int ret = 0;
5274
5275         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5276                 ext = nft_set_elem_ext(set, catchall->elem);
5277                 if (!nft_set_elem_active(ext, genmask))
5278                         continue;
5279
5280                 elem.priv = catchall->elem;
5281                 ret = nft_setelem_data_validate(ctx, set, &elem);
5282                 if (ret < 0)
5283                         break;
5284         }
5285
5286         return ret;
5287 }
5288
5289 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5290                        struct nft_set_binding *binding)
5291 {
5292         struct nft_set_binding *i;
5293         struct nft_set_iter iter;
5294
5295         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5296                 return -EBUSY;
5297
5298         if (binding->flags & NFT_SET_MAP) {
5299                 /* If the set is already bound to the same chain all
5300                  * jumps are already validated for that chain.
5301                  */
5302                 list_for_each_entry(i, &set->bindings, list) {
5303                         if (i->flags & NFT_SET_MAP &&
5304                             i->chain == binding->chain)
5305                                 goto bind;
5306                 }
5307
5308                 iter.genmask    = nft_genmask_next(ctx->net);
5309                 iter.skip       = 0;
5310                 iter.count      = 0;
5311                 iter.err        = 0;
5312                 iter.fn         = nf_tables_bind_check_setelem;
5313
5314                 set->ops->walk(ctx, set, &iter);
5315                 if (!iter.err)
5316                         iter.err = nft_set_catchall_bind_check(ctx, set);
5317
5318                 if (iter.err < 0)
5319                         return iter.err;
5320         }
5321 bind:
5322         if (!nft_use_inc(&set->use))
5323                 return -EMFILE;
5324
5325         binding->chain = ctx->chain;
5326         list_add_tail_rcu(&binding->list, &set->bindings);
5327         nft_set_trans_bind(ctx, set);
5328
5329         return 0;
5330 }
5331 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5332
5333 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5334                                  struct nft_set_binding *binding, bool event)
5335 {
5336         list_del_rcu(&binding->list);
5337
5338         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5339                 list_del_rcu(&set->list);
5340                 if (event)
5341                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5342                                              GFP_KERNEL);
5343         }
5344 }
5345
5346 static void nft_setelem_data_activate(const struct net *net,
5347                                       const struct nft_set *set,
5348                                       struct nft_set_elem *elem);
5349
5350 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5351                                 struct nft_set *set,
5352                                 const struct nft_set_iter *iter,
5353                                 struct nft_set_elem *elem)
5354 {
5355         nft_setelem_data_activate(ctx->net, set, elem);
5356
5357         return 0;
5358 }
5359
5360 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5361                                       struct nft_set *set)
5362 {
5363         u8 genmask = nft_genmask_next(ctx->net);
5364         struct nft_set_elem_catchall *catchall;
5365         struct nft_set_elem elem;
5366         struct nft_set_ext *ext;
5367
5368         list_for_each_entry(catchall, &set->catchall_list, list) {
5369                 ext = nft_set_elem_ext(set, catchall->elem);
5370                 if (!nft_set_elem_active(ext, genmask))
5371                         continue;
5372
5373                 elem.priv = catchall->elem;
5374                 nft_setelem_data_activate(ctx->net, set, &elem);
5375                 break;
5376         }
5377 }
5378
5379 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5380 {
5381         struct nft_set_iter iter = {
5382                 .genmask        = nft_genmask_next(ctx->net),
5383                 .fn             = nft_mapelem_activate,
5384         };
5385
5386         set->ops->walk(ctx, set, &iter);
5387         WARN_ON_ONCE(iter.err);
5388
5389         nft_map_catchall_activate(ctx, set);
5390 }
5391
5392 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5393 {
5394         if (nft_set_is_anonymous(set)) {
5395                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5396                         nft_map_activate(ctx, set);
5397
5398                 nft_clear(ctx->net, set);
5399         }
5400
5401         nft_use_inc_restore(&set->use);
5402 }
5403 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5404
5405 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5406                               struct nft_set_binding *binding,
5407                               enum nft_trans_phase phase)
5408 {
5409         switch (phase) {
5410         case NFT_TRANS_PREPARE_ERROR:
5411                 nft_set_trans_unbind(ctx, set);
5412                 if (nft_set_is_anonymous(set))
5413                         nft_deactivate_next(ctx->net, set);
5414                 else
5415                         list_del_rcu(&binding->list);
5416
5417                 nft_use_dec(&set->use);
5418                 break;
5419         case NFT_TRANS_PREPARE:
5420                 if (nft_set_is_anonymous(set)) {
5421                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5422                                 nft_map_deactivate(ctx, set);
5423
5424                         nft_deactivate_next(ctx->net, set);
5425                 }
5426                 nft_use_dec(&set->use);
5427                 return;
5428         case NFT_TRANS_ABORT:
5429         case NFT_TRANS_RELEASE:
5430                 if (nft_set_is_anonymous(set) &&
5431                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5432                         nft_map_deactivate(ctx, set);
5433
5434                 nft_use_dec(&set->use);
5435                 fallthrough;
5436         default:
5437                 nf_tables_unbind_set(ctx, set, binding,
5438                                      phase == NFT_TRANS_COMMIT);
5439         }
5440 }
5441 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5442
5443 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5444 {
5445         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5446                 nft_set_destroy(ctx, set);
5447 }
5448 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5449
5450 const struct nft_set_ext_type nft_set_ext_types[] = {
5451         [NFT_SET_EXT_KEY]               = {
5452                 .align  = __alignof__(u32),
5453         },
5454         [NFT_SET_EXT_DATA]              = {
5455                 .align  = __alignof__(u32),
5456         },
5457         [NFT_SET_EXT_EXPRESSIONS]       = {
5458                 .align  = __alignof__(struct nft_set_elem_expr),
5459         },
5460         [NFT_SET_EXT_OBJREF]            = {
5461                 .len    = sizeof(struct nft_object *),
5462                 .align  = __alignof__(struct nft_object *),
5463         },
5464         [NFT_SET_EXT_FLAGS]             = {
5465                 .len    = sizeof(u8),
5466                 .align  = __alignof__(u8),
5467         },
5468         [NFT_SET_EXT_TIMEOUT]           = {
5469                 .len    = sizeof(u64),
5470                 .align  = __alignof__(u64),
5471         },
5472         [NFT_SET_EXT_EXPIRATION]        = {
5473                 .len    = sizeof(u64),
5474                 .align  = __alignof__(u64),
5475         },
5476         [NFT_SET_EXT_USERDATA]          = {
5477                 .len    = sizeof(struct nft_userdata),
5478                 .align  = __alignof__(struct nft_userdata),
5479         },
5480         [NFT_SET_EXT_KEY_END]           = {
5481                 .align  = __alignof__(u32),
5482         },
5483 };
5484
5485 /*
5486  * Set elements
5487  */
5488
5489 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5490         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5491         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5492         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5493         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5494         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5495         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5496                                             .len = NFT_USERDATA_MAXLEN },
5497         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5498         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5499                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5500         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5501         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5502 };
5503
5504 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5505         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5506                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5507         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5508                                             .len = NFT_SET_MAXNAMELEN - 1 },
5509         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5510         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5511 };
5512
5513 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5514                                   const struct nft_set *set,
5515                                   const struct nft_set_ext *ext,
5516                                   bool reset)
5517 {
5518         struct nft_set_elem_expr *elem_expr;
5519         u32 size, num_exprs = 0;
5520         struct nft_expr *expr;
5521         struct nlattr *nest;
5522
5523         elem_expr = nft_set_ext_expr(ext);
5524         nft_setelem_expr_foreach(expr, elem_expr, size)
5525                 num_exprs++;
5526
5527         if (num_exprs == 1) {
5528                 expr = nft_setelem_expr_at(elem_expr, 0);
5529                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5530                         return -1;
5531
5532                 return 0;
5533         } else if (num_exprs > 1) {
5534                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5535                 if (nest == NULL)
5536                         goto nla_put_failure;
5537
5538                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5539                         expr = nft_setelem_expr_at(elem_expr, size);
5540                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5541                                 goto nla_put_failure;
5542                 }
5543                 nla_nest_end(skb, nest);
5544         }
5545         return 0;
5546
5547 nla_put_failure:
5548         return -1;
5549 }
5550
5551 static int nf_tables_fill_setelem(struct sk_buff *skb,
5552                                   const struct nft_set *set,
5553                                   const struct nft_set_elem *elem,
5554                                   bool reset)
5555 {
5556         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5557         unsigned char *b = skb_tail_pointer(skb);
5558         struct nlattr *nest;
5559
5560         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5561         if (nest == NULL)
5562                 goto nla_put_failure;
5563
5564         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5565             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5566                           NFT_DATA_VALUE, set->klen) < 0)
5567                 goto nla_put_failure;
5568
5569         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5570             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5571                           NFT_DATA_VALUE, set->klen) < 0)
5572                 goto nla_put_failure;
5573
5574         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5575             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5576                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5577                           set->dlen) < 0)
5578                 goto nla_put_failure;
5579
5580         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5581             nft_set_elem_expr_dump(skb, set, ext, reset))
5582                 goto nla_put_failure;
5583
5584         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5585             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5586                            (*nft_set_ext_obj(ext))->key.name) < 0)
5587                 goto nla_put_failure;
5588
5589         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5590             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5591                          htonl(*nft_set_ext_flags(ext))))
5592                 goto nla_put_failure;
5593
5594         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5595             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5596                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5597                          NFTA_SET_ELEM_PAD))
5598                 goto nla_put_failure;
5599
5600         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5601                 u64 expires, now = get_jiffies_64();
5602
5603                 expires = *nft_set_ext_expiration(ext);
5604                 if (time_before64(now, expires))
5605                         expires -= now;
5606                 else
5607                         expires = 0;
5608
5609                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5610                                  nf_jiffies64_to_msecs(expires),
5611                                  NFTA_SET_ELEM_PAD))
5612                         goto nla_put_failure;
5613         }
5614
5615         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5616                 struct nft_userdata *udata;
5617
5618                 udata = nft_set_ext_userdata(ext);
5619                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5620                             udata->len + 1, udata->data))
5621                         goto nla_put_failure;
5622         }
5623
5624         nla_nest_end(skb, nest);
5625         return 0;
5626
5627 nla_put_failure:
5628         nlmsg_trim(skb, b);
5629         return -EMSGSIZE;
5630 }
5631
5632 struct nft_set_dump_args {
5633         const struct netlink_callback   *cb;
5634         struct nft_set_iter             iter;
5635         struct sk_buff                  *skb;
5636         bool                            reset;
5637 };
5638
5639 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5640                                   struct nft_set *set,
5641                                   const struct nft_set_iter *iter,
5642                                   struct nft_set_elem *elem)
5643 {
5644         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5645         struct nft_set_dump_args *args;
5646
5647         if (nft_set_elem_expired(ext))
5648                 return 0;
5649
5650         args = container_of(iter, struct nft_set_dump_args, iter);
5651         return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5652 }
5653
5654 static void audit_log_nft_set_reset(const struct nft_table *table,
5655                                     unsigned int base_seq,
5656                                     unsigned int nentries)
5657 {
5658         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5659
5660         audit_log_nfcfg(buf, table->family, nentries,
5661                         AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5662         kfree(buf);
5663 }
5664
5665 struct nft_set_dump_ctx {
5666         const struct nft_set    *set;
5667         struct nft_ctx          ctx;
5668 };
5669
5670 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5671                                  const struct nft_set *set, bool reset,
5672                                  unsigned int base_seq)
5673 {
5674         struct nft_set_elem_catchall *catchall;
5675         u8 genmask = nft_genmask_cur(net);
5676         struct nft_set_elem elem;
5677         struct nft_set_ext *ext;
5678         int ret = 0;
5679
5680         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5681                 ext = nft_set_elem_ext(set, catchall->elem);
5682                 if (!nft_set_elem_active(ext, genmask) ||
5683                     nft_set_elem_expired(ext))
5684                         continue;
5685
5686                 elem.priv = catchall->elem;
5687                 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5688                 if (reset && !ret)
5689                         audit_log_nft_set_reset(set->table, base_seq, 1);
5690                 break;
5691         }
5692
5693         return ret;
5694 }
5695
5696 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5697 {
5698         struct nft_set_dump_ctx *dump_ctx = cb->data;
5699         struct net *net = sock_net(skb->sk);
5700         struct nftables_pernet *nft_net;
5701         struct nft_table *table;
5702         struct nft_set *set;
5703         struct nft_set_dump_args args;
5704         bool set_found = false;
5705         struct nlmsghdr *nlh;
5706         struct nlattr *nest;
5707         bool reset = false;
5708         u32 portid, seq;
5709         int event;
5710
5711         rcu_read_lock();
5712         nft_net = nft_pernet(net);
5713         cb->seq = READ_ONCE(nft_net->base_seq);
5714
5715         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5716                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5717                     dump_ctx->ctx.family != table->family)
5718                         continue;
5719
5720                 if (table != dump_ctx->ctx.table)
5721                         continue;
5722
5723                 list_for_each_entry_rcu(set, &table->sets, list) {
5724                         if (set == dump_ctx->set) {
5725                                 set_found = true;
5726                                 break;
5727                         }
5728                 }
5729                 break;
5730         }
5731
5732         if (!set_found) {
5733                 rcu_read_unlock();
5734                 return -ENOENT;
5735         }
5736
5737         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5738         portid = NETLINK_CB(cb->skb).portid;
5739         seq    = cb->nlh->nlmsg_seq;
5740
5741         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5742                            table->family, NFNETLINK_V0, nft_base_seq(net));
5743         if (!nlh)
5744                 goto nla_put_failure;
5745
5746         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5747                 goto nla_put_failure;
5748         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5749                 goto nla_put_failure;
5750
5751         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5752         if (nest == NULL)
5753                 goto nla_put_failure;
5754
5755         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5756                 reset = true;
5757
5758         args.cb                 = cb;
5759         args.skb                = skb;
5760         args.reset              = reset;
5761         args.iter.genmask       = nft_genmask_cur(net);
5762         args.iter.skip          = cb->args[0];
5763         args.iter.count         = 0;
5764         args.iter.err           = 0;
5765         args.iter.fn            = nf_tables_dump_setelem;
5766         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5767
5768         if (!args.iter.err && args.iter.count == cb->args[0])
5769                 args.iter.err = nft_set_catchall_dump(net, skb, set,
5770                                                       reset, cb->seq);
5771         nla_nest_end(skb, nest);
5772         nlmsg_end(skb, nlh);
5773
5774         if (reset && args.iter.count > args.iter.skip)
5775                 audit_log_nft_set_reset(table, cb->seq,
5776                                         args.iter.count - args.iter.skip);
5777
5778         rcu_read_unlock();
5779
5780         if (args.iter.err && args.iter.err != -EMSGSIZE)
5781                 return args.iter.err;
5782         if (args.iter.count == cb->args[0])
5783                 return 0;
5784
5785         cb->args[0] = args.iter.count;
5786         return skb->len;
5787
5788 nla_put_failure:
5789         rcu_read_unlock();
5790         return -ENOSPC;
5791 }
5792
5793 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5794 {
5795         struct nft_set_dump_ctx *dump_ctx = cb->data;
5796
5797         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5798
5799         return cb->data ? 0 : -ENOMEM;
5800 }
5801
5802 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5803 {
5804         kfree(cb->data);
5805         return 0;
5806 }
5807
5808 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5809                                        const struct nft_ctx *ctx, u32 seq,
5810                                        u32 portid, int event, u16 flags,
5811                                        const struct nft_set *set,
5812                                        const struct nft_set_elem *elem,
5813                                        bool reset)
5814 {
5815         struct nlmsghdr *nlh;
5816         struct nlattr *nest;
5817         int err;
5818
5819         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5820         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5821                            NFNETLINK_V0, nft_base_seq(ctx->net));
5822         if (!nlh)
5823                 goto nla_put_failure;
5824
5825         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5826                 goto nla_put_failure;
5827         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5828                 goto nla_put_failure;
5829
5830         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5831         if (nest == NULL)
5832                 goto nla_put_failure;
5833
5834         err = nf_tables_fill_setelem(skb, set, elem, reset);
5835         if (err < 0)
5836                 goto nla_put_failure;
5837
5838         nla_nest_end(skb, nest);
5839
5840         nlmsg_end(skb, nlh);
5841         return 0;
5842
5843 nla_put_failure:
5844         nlmsg_trim(skb, nlh);
5845         return -1;
5846 }
5847
5848 static int nft_setelem_parse_flags(const struct nft_set *set,
5849                                    const struct nlattr *attr, u32 *flags)
5850 {
5851         if (attr == NULL)
5852                 return 0;
5853
5854         *flags = ntohl(nla_get_be32(attr));
5855         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5856                 return -EOPNOTSUPP;
5857         if (!(set->flags & NFT_SET_INTERVAL) &&
5858             *flags & NFT_SET_ELEM_INTERVAL_END)
5859                 return -EINVAL;
5860         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5861             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5862                 return -EINVAL;
5863
5864         return 0;
5865 }
5866
5867 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5868                                  struct nft_data *key, struct nlattr *attr)
5869 {
5870         struct nft_data_desc desc = {
5871                 .type   = NFT_DATA_VALUE,
5872                 .size   = NFT_DATA_VALUE_MAXLEN,
5873                 .len    = set->klen,
5874         };
5875
5876         return nft_data_init(ctx, key, &desc, attr);
5877 }
5878
5879 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5880                                   struct nft_data_desc *desc,
5881                                   struct nft_data *data,
5882                                   struct nlattr *attr)
5883 {
5884         u32 dtype;
5885
5886         if (set->dtype == NFT_DATA_VERDICT)
5887                 dtype = NFT_DATA_VERDICT;
5888         else
5889                 dtype = NFT_DATA_VALUE;
5890
5891         desc->type = dtype;
5892         desc->size = NFT_DATA_VALUE_MAXLEN;
5893         desc->len = set->dlen;
5894         desc->flags = NFT_DATA_DESC_SETELEM;
5895
5896         return nft_data_init(ctx, data, desc, attr);
5897 }
5898
5899 static void *nft_setelem_catchall_get(const struct net *net,
5900                                       const struct nft_set *set)
5901 {
5902         struct nft_set_elem_catchall *catchall;
5903         u8 genmask = nft_genmask_cur(net);
5904         struct nft_set_ext *ext;
5905         void *priv = NULL;
5906
5907         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5908                 ext = nft_set_elem_ext(set, catchall->elem);
5909                 if (!nft_set_elem_active(ext, genmask) ||
5910                     nft_set_elem_expired(ext))
5911                         continue;
5912
5913                 priv = catchall->elem;
5914                 break;
5915         }
5916
5917         return priv;
5918 }
5919
5920 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5921                            struct nft_set_elem *elem, u32 flags)
5922 {
5923         void *priv;
5924
5925         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5926                 priv = set->ops->get(ctx->net, set, elem, flags);
5927                 if (IS_ERR(priv))
5928                         return PTR_ERR(priv);
5929         } else {
5930                 priv = nft_setelem_catchall_get(ctx->net, set);
5931                 if (!priv)
5932                         return -ENOENT;
5933         }
5934         elem->priv = priv;
5935
5936         return 0;
5937 }
5938
5939 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5940                             const struct nlattr *attr, bool reset)
5941 {
5942         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5943         struct nft_set_elem elem;
5944         struct sk_buff *skb;
5945         uint32_t flags = 0;
5946         int err;
5947
5948         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5949                                           nft_set_elem_policy, NULL);
5950         if (err < 0)
5951                 return err;
5952
5953         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5954         if (err < 0)
5955                 return err;
5956
5957         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5958                 return -EINVAL;
5959
5960         if (nla[NFTA_SET_ELEM_KEY]) {
5961                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5962                                             nla[NFTA_SET_ELEM_KEY]);
5963                 if (err < 0)
5964                         return err;
5965         }
5966
5967         if (nla[NFTA_SET_ELEM_KEY_END]) {
5968                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5969                                             nla[NFTA_SET_ELEM_KEY_END]);
5970                 if (err < 0)
5971                         return err;
5972         }
5973
5974         err = nft_setelem_get(ctx, set, &elem, flags);
5975         if (err < 0)
5976                 return err;
5977
5978         err = -ENOMEM;
5979         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5980         if (skb == NULL)
5981                 return err;
5982
5983         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5984                                           NFT_MSG_NEWSETELEM, 0, set, &elem,
5985                                           reset);
5986         if (err < 0)
5987                 goto err_fill_setelem;
5988
5989         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5990
5991 err_fill_setelem:
5992         kfree_skb(skb);
5993         return err;
5994 }
5995
5996 /* called with rcu_read_lock held */
5997 static int nf_tables_getsetelem(struct sk_buff *skb,
5998                                 const struct nfnl_info *info,
5999                                 const struct nlattr * const nla[])
6000 {
6001         struct netlink_ext_ack *extack = info->extack;
6002         u8 genmask = nft_genmask_cur(info->net);
6003         u8 family = info->nfmsg->nfgen_family;
6004         int rem, err = 0, nelems = 0;
6005         struct net *net = info->net;
6006         struct nft_table *table;
6007         struct nft_set *set;
6008         struct nlattr *attr;
6009         struct nft_ctx ctx;
6010         bool reset = false;
6011
6012         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6013                                  genmask, 0);
6014         if (IS_ERR(table)) {
6015                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6016                 return PTR_ERR(table);
6017         }
6018
6019         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6020         if (IS_ERR(set))
6021                 return PTR_ERR(set);
6022
6023         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6024
6025         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6026                 struct netlink_dump_control c = {
6027                         .start = nf_tables_dump_set_start,
6028                         .dump = nf_tables_dump_set,
6029                         .done = nf_tables_dump_set_done,
6030                         .module = THIS_MODULE,
6031                 };
6032                 struct nft_set_dump_ctx dump_ctx = {
6033                         .set = set,
6034                         .ctx = ctx,
6035                 };
6036
6037                 c.data = &dump_ctx;
6038                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6039         }
6040
6041         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6042                 return -EINVAL;
6043
6044         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6045                 reset = true;
6046
6047         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6048                 err = nft_get_set_elem(&ctx, set, attr, reset);
6049                 if (err < 0) {
6050                         NL_SET_BAD_ATTR(extack, attr);
6051                         break;
6052                 }
6053                 nelems++;
6054         }
6055
6056         if (reset)
6057                 audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6058                                         nelems);
6059
6060         return err;
6061 }
6062
6063 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6064                                      const struct nft_set *set,
6065                                      const struct nft_set_elem *elem,
6066                                      int event)
6067 {
6068         struct nftables_pernet *nft_net;
6069         struct net *net = ctx->net;
6070         u32 portid = ctx->portid;
6071         struct sk_buff *skb;
6072         u16 flags = 0;
6073         int err;
6074
6075         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6076                 return;
6077
6078         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6079         if (skb == NULL)
6080                 goto err;
6081
6082         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6083                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6084
6085         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6086                                           set, elem, false);
6087         if (err < 0) {
6088                 kfree_skb(skb);
6089                 goto err;
6090         }
6091
6092         nft_net = nft_pernet(net);
6093         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6094         return;
6095 err:
6096         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6097 }
6098
6099 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6100                                               int msg_type,
6101                                               struct nft_set *set)
6102 {
6103         struct nft_trans *trans;
6104
6105         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6106         if (trans == NULL)
6107                 return NULL;
6108
6109         nft_trans_elem_set(trans) = set;
6110         return trans;
6111 }
6112
6113 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6114                                          const struct nft_set *set,
6115                                          const struct nlattr *attr)
6116 {
6117         struct nft_expr *expr;
6118         int err;
6119
6120         expr = nft_expr_init(ctx, attr);
6121         if (IS_ERR(expr))
6122                 return expr;
6123
6124         err = -EOPNOTSUPP;
6125         if (expr->ops->type->flags & NFT_EXPR_GC) {
6126                 if (set->flags & NFT_SET_TIMEOUT)
6127                         goto err_set_elem_expr;
6128                 if (!set->ops->gc_init)
6129                         goto err_set_elem_expr;
6130                 set->ops->gc_init(set);
6131         }
6132
6133         return expr;
6134
6135 err_set_elem_expr:
6136         nft_expr_destroy(ctx, expr);
6137         return ERR_PTR(err);
6138 }
6139
6140 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6141 {
6142         len += nft_set_ext_types[id].len;
6143         if (len > tmpl->ext_len[id] ||
6144             len > U8_MAX)
6145                 return -1;
6146
6147         return 0;
6148 }
6149
6150 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6151                               void *to, const void *from, u32 len)
6152 {
6153         if (nft_set_ext_check(tmpl, id, len) < 0)
6154                 return -1;
6155
6156         memcpy(to, from, len);
6157
6158         return 0;
6159 }
6160
6161 void *nft_set_elem_init(const struct nft_set *set,
6162                         const struct nft_set_ext_tmpl *tmpl,
6163                         const u32 *key, const u32 *key_end,
6164                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6165 {
6166         struct nft_set_ext *ext;
6167         void *elem;
6168
6169         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6170         if (elem == NULL)
6171                 return ERR_PTR(-ENOMEM);
6172
6173         ext = nft_set_elem_ext(set, elem);
6174         nft_set_ext_init(ext, tmpl);
6175
6176         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6177             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6178                                nft_set_ext_key(ext), key, set->klen) < 0)
6179                 goto err_ext_check;
6180
6181         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6182             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6183                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6184                 goto err_ext_check;
6185
6186         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6187             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6188                                nft_set_ext_data(ext), data, set->dlen) < 0)
6189                 goto err_ext_check;
6190
6191         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6192                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6193                 if (expiration == 0)
6194                         *nft_set_ext_expiration(ext) += timeout;
6195         }
6196         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6197                 *nft_set_ext_timeout(ext) = timeout;
6198
6199         return elem;
6200
6201 err_ext_check:
6202         kfree(elem);
6203
6204         return ERR_PTR(-EINVAL);
6205 }
6206
6207 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6208                                         struct nft_expr *expr)
6209 {
6210         if (expr->ops->destroy_clone) {
6211                 expr->ops->destroy_clone(ctx, expr);
6212                 module_put(expr->ops->type->owner);
6213         } else {
6214                 nf_tables_expr_destroy(ctx, expr);
6215         }
6216 }
6217
6218 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6219                                       struct nft_set_elem_expr *elem_expr)
6220 {
6221         struct nft_expr *expr;
6222         u32 size;
6223
6224         nft_setelem_expr_foreach(expr, elem_expr, size)
6225                 __nft_set_elem_expr_destroy(ctx, expr);
6226 }
6227
6228 /* Drop references and destroy. Called from gc, dynset and abort path. */
6229 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6230                           bool destroy_expr)
6231 {
6232         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6233         struct nft_ctx ctx = {
6234                 .net    = read_pnet(&set->net),
6235                 .family = set->table->family,
6236         };
6237
6238         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6239         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6240                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6241         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6242                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6243
6244         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6245                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6246         kfree(elem);
6247 }
6248 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6249
6250 /* Destroy element. References have been already dropped in the preparation
6251  * path via nft_setelem_data_deactivate().
6252  */
6253 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6254                                 const struct nft_set *set, void *elem)
6255 {
6256         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6257
6258         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6259                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6260
6261         kfree(elem);
6262 }
6263
6264 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6265                             struct nft_expr *expr_array[])
6266 {
6267         struct nft_expr *expr;
6268         int err, i, k;
6269
6270         for (i = 0; i < set->num_exprs; i++) {
6271                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6272                 if (!expr)
6273                         goto err_expr;
6274
6275                 err = nft_expr_clone(expr, set->exprs[i]);
6276                 if (err < 0) {
6277                         kfree(expr);
6278                         goto err_expr;
6279                 }
6280                 expr_array[i] = expr;
6281         }
6282
6283         return 0;
6284
6285 err_expr:
6286         for (k = i - 1; k >= 0; k--)
6287                 nft_expr_destroy(ctx, expr_array[k]);
6288
6289         return -ENOMEM;
6290 }
6291
6292 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6293                                    const struct nft_set_ext_tmpl *tmpl,
6294                                    const struct nft_set_ext *ext,
6295                                    struct nft_expr *expr_array[],
6296                                    u32 num_exprs)
6297 {
6298         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6299         u32 len = sizeof(struct nft_set_elem_expr);
6300         struct nft_expr *expr;
6301         int i, err;
6302
6303         if (num_exprs == 0)
6304                 return 0;
6305
6306         for (i = 0; i < num_exprs; i++)
6307                 len += expr_array[i]->ops->size;
6308
6309         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6310                 return -EINVAL;
6311
6312         for (i = 0; i < num_exprs; i++) {
6313                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6314                 err = nft_expr_clone(expr, expr_array[i]);
6315                 if (err < 0)
6316                         goto err_elem_expr_setup;
6317
6318                 elem_expr->size += expr_array[i]->ops->size;
6319                 nft_expr_destroy(ctx, expr_array[i]);
6320                 expr_array[i] = NULL;
6321         }
6322
6323         return 0;
6324
6325 err_elem_expr_setup:
6326         for (; i < num_exprs; i++) {
6327                 nft_expr_destroy(ctx, expr_array[i]);
6328                 expr_array[i] = NULL;
6329         }
6330
6331         return -ENOMEM;
6332 }
6333
6334 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6335                                             const struct nft_set *set)
6336 {
6337         struct nft_set_elem_catchall *catchall;
6338         u8 genmask = nft_genmask_cur(net);
6339         struct nft_set_ext *ext;
6340
6341         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6342                 ext = nft_set_elem_ext(set, catchall->elem);
6343                 if (nft_set_elem_active(ext, genmask) &&
6344                     !nft_set_elem_expired(ext) &&
6345                     !nft_set_elem_is_dead(ext))
6346                         return ext;
6347         }
6348
6349         return NULL;
6350 }
6351 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6352
6353 static int nft_setelem_catchall_insert(const struct net *net,
6354                                        struct nft_set *set,
6355                                        const struct nft_set_elem *elem,
6356                                        struct nft_set_ext **pext)
6357 {
6358         struct nft_set_elem_catchall *catchall;
6359         u8 genmask = nft_genmask_next(net);
6360         struct nft_set_ext *ext;
6361
6362         list_for_each_entry(catchall, &set->catchall_list, list) {
6363                 ext = nft_set_elem_ext(set, catchall->elem);
6364                 if (nft_set_elem_active(ext, genmask)) {
6365                         *pext = ext;
6366                         return -EEXIST;
6367                 }
6368         }
6369
6370         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6371         if (!catchall)
6372                 return -ENOMEM;
6373
6374         catchall->elem = elem->priv;
6375         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6376
6377         return 0;
6378 }
6379
6380 static int nft_setelem_insert(const struct net *net,
6381                               struct nft_set *set,
6382                               const struct nft_set_elem *elem,
6383                               struct nft_set_ext **ext, unsigned int flags)
6384 {
6385         int ret;
6386
6387         if (flags & NFT_SET_ELEM_CATCHALL)
6388                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6389         else
6390                 ret = set->ops->insert(net, set, elem, ext);
6391
6392         return ret;
6393 }
6394
6395 static bool nft_setelem_is_catchall(const struct nft_set *set,
6396                                     const struct nft_set_elem *elem)
6397 {
6398         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6399
6400         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6401             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6402                 return true;
6403
6404         return false;
6405 }
6406
6407 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6408                                  struct nft_set_elem *elem)
6409 {
6410         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6411
6412         if (nft_setelem_is_catchall(set, elem)) {
6413                 nft_set_elem_change_active(net, set, ext);
6414         } else {
6415                 set->ops->activate(net, set, elem);
6416         }
6417 }
6418
6419 static int nft_setelem_catchall_deactivate(const struct net *net,
6420                                            struct nft_set *set,
6421                                            struct nft_set_elem *elem)
6422 {
6423         struct nft_set_elem_catchall *catchall;
6424         struct nft_set_ext *ext;
6425
6426         list_for_each_entry(catchall, &set->catchall_list, list) {
6427                 ext = nft_set_elem_ext(set, catchall->elem);
6428                 if (!nft_is_active(net, ext))
6429                         continue;
6430
6431                 kfree(elem->priv);
6432                 elem->priv = catchall->elem;
6433                 nft_set_elem_change_active(net, set, ext);
6434                 return 0;
6435         }
6436
6437         return -ENOENT;
6438 }
6439
6440 static int __nft_setelem_deactivate(const struct net *net,
6441                                     struct nft_set *set,
6442                                     struct nft_set_elem *elem)
6443 {
6444         void *priv;
6445
6446         priv = set->ops->deactivate(net, set, elem);
6447         if (!priv)
6448                 return -ENOENT;
6449
6450         kfree(elem->priv);
6451         elem->priv = priv;
6452         set->ndeact++;
6453
6454         return 0;
6455 }
6456
6457 static int nft_setelem_deactivate(const struct net *net,
6458                                   struct nft_set *set,
6459                                   struct nft_set_elem *elem, u32 flags)
6460 {
6461         int ret;
6462
6463         if (flags & NFT_SET_ELEM_CATCHALL)
6464                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6465         else
6466                 ret = __nft_setelem_deactivate(net, set, elem);
6467
6468         return ret;
6469 }
6470
6471 static void nft_setelem_catchall_remove(const struct net *net,
6472                                         const struct nft_set *set,
6473                                         const struct nft_set_elem *elem)
6474 {
6475         struct nft_set_elem_catchall *catchall, *next;
6476
6477         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6478                 if (catchall->elem == elem->priv) {
6479                         list_del_rcu(&catchall->list);
6480                         kfree_rcu(catchall, rcu);
6481                         break;
6482                 }
6483         }
6484 }
6485
6486 static void nft_setelem_remove(const struct net *net,
6487                                const struct nft_set *set,
6488                                const struct nft_set_elem *elem)
6489 {
6490         if (nft_setelem_is_catchall(set, elem))
6491                 nft_setelem_catchall_remove(net, set, elem);
6492         else
6493                 set->ops->remove(net, set, elem);
6494 }
6495
6496 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6497                                       struct nlattr **nla, u32 flags)
6498 {
6499         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6500                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6501                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6502                         return false;
6503
6504                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6505                     flags & NFT_SET_ELEM_CATCHALL)
6506                         return false;
6507         } else {
6508                 if (nla[NFTA_SET_ELEM_KEY_END])
6509                         return false;
6510         }
6511
6512         return true;
6513 }
6514
6515 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6516                             const struct nlattr *attr, u32 nlmsg_flags)
6517 {
6518         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6519         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6520         u8 genmask = nft_genmask_next(ctx->net);
6521         u32 flags = 0, size = 0, num_exprs = 0;
6522         struct nft_set_ext_tmpl tmpl;
6523         struct nft_set_ext *ext, *ext2;
6524         struct nft_set_elem elem;
6525         struct nft_set_binding *binding;
6526         struct nft_object *obj = NULL;
6527         struct nft_userdata *udata;
6528         struct nft_data_desc desc;
6529         enum nft_registers dreg;
6530         struct nft_trans *trans;
6531         u64 timeout;
6532         u64 expiration;
6533         int err, i;
6534         u8 ulen;
6535
6536         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6537                                           nft_set_elem_policy, NULL);
6538         if (err < 0)
6539                 return err;
6540
6541         nft_set_ext_prepare(&tmpl);
6542
6543         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6544         if (err < 0)
6545                 return err;
6546
6547         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6548             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6549                 return -EINVAL;
6550
6551         if (flags != 0) {
6552                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6553                 if (err < 0)
6554                         return err;
6555         }
6556
6557         if (set->flags & NFT_SET_MAP) {
6558                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6559                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6560                         return -EINVAL;
6561         } else {
6562                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6563                         return -EINVAL;
6564         }
6565
6566         if (set->flags & NFT_SET_OBJECT) {
6567                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6568                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6569                         return -EINVAL;
6570         } else {
6571                 if (nla[NFTA_SET_ELEM_OBJREF])
6572                         return -EINVAL;
6573         }
6574
6575         if (!nft_setelem_valid_key_end(set, nla, flags))
6576                 return -EINVAL;
6577
6578         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6579              (nla[NFTA_SET_ELEM_DATA] ||
6580               nla[NFTA_SET_ELEM_OBJREF] ||
6581               nla[NFTA_SET_ELEM_TIMEOUT] ||
6582               nla[NFTA_SET_ELEM_EXPIRATION] ||
6583               nla[NFTA_SET_ELEM_USERDATA] ||
6584               nla[NFTA_SET_ELEM_EXPR] ||
6585               nla[NFTA_SET_ELEM_KEY_END] ||
6586               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6587                 return -EINVAL;
6588
6589         timeout = 0;
6590         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6591                 if (!(set->flags & NFT_SET_TIMEOUT))
6592                         return -EINVAL;
6593                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6594                                             &timeout);
6595                 if (err)
6596                         return err;
6597         } else if (set->flags & NFT_SET_TIMEOUT &&
6598                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6599                 timeout = READ_ONCE(set->timeout);
6600         }
6601
6602         expiration = 0;
6603         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6604                 if (!(set->flags & NFT_SET_TIMEOUT))
6605                         return -EINVAL;
6606                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6607                                             &expiration);
6608                 if (err)
6609                         return err;
6610         }
6611
6612         if (nla[NFTA_SET_ELEM_EXPR]) {
6613                 struct nft_expr *expr;
6614
6615                 if (set->num_exprs && set->num_exprs != 1)
6616                         return -EOPNOTSUPP;
6617
6618                 expr = nft_set_elem_expr_alloc(ctx, set,
6619                                                nla[NFTA_SET_ELEM_EXPR]);
6620                 if (IS_ERR(expr))
6621                         return PTR_ERR(expr);
6622
6623                 expr_array[0] = expr;
6624                 num_exprs = 1;
6625
6626                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6627                         err = -EOPNOTSUPP;
6628                         goto err_set_elem_expr;
6629                 }
6630         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6631                 struct nft_expr *expr;
6632                 struct nlattr *tmp;
6633                 int left;
6634
6635                 i = 0;
6636                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6637                         if (i == NFT_SET_EXPR_MAX ||
6638                             (set->num_exprs && set->num_exprs == i)) {
6639                                 err = -E2BIG;
6640                                 goto err_set_elem_expr;
6641                         }
6642                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6643                                 err = -EINVAL;
6644                                 goto err_set_elem_expr;
6645                         }
6646                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6647                         if (IS_ERR(expr)) {
6648                                 err = PTR_ERR(expr);
6649                                 goto err_set_elem_expr;
6650                         }
6651                         expr_array[i] = expr;
6652                         num_exprs++;
6653
6654                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6655                                 err = -EOPNOTSUPP;
6656                                 goto err_set_elem_expr;
6657                         }
6658                         i++;
6659                 }
6660                 if (set->num_exprs && set->num_exprs != i) {
6661                         err = -EOPNOTSUPP;
6662                         goto err_set_elem_expr;
6663                 }
6664         } else if (set->num_exprs > 0 &&
6665                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6666                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6667                 if (err < 0)
6668                         goto err_set_elem_expr_clone;
6669
6670                 num_exprs = set->num_exprs;
6671         }
6672
6673         if (nla[NFTA_SET_ELEM_KEY]) {
6674                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6675                                             nla[NFTA_SET_ELEM_KEY]);
6676                 if (err < 0)
6677                         goto err_set_elem_expr;
6678
6679                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6680                 if (err < 0)
6681                         goto err_parse_key;
6682         }
6683
6684         if (nla[NFTA_SET_ELEM_KEY_END]) {
6685                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6686                                             nla[NFTA_SET_ELEM_KEY_END]);
6687                 if (err < 0)
6688                         goto err_parse_key;
6689
6690                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6691                 if (err < 0)
6692                         goto err_parse_key_end;
6693         }
6694
6695         if (timeout > 0) {
6696                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6697                 if (err < 0)
6698                         goto err_parse_key_end;
6699
6700                 if (timeout != READ_ONCE(set->timeout)) {
6701                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6702                         if (err < 0)
6703                                 goto err_parse_key_end;
6704                 }
6705         }
6706
6707         if (num_exprs) {
6708                 for (i = 0; i < num_exprs; i++)
6709                         size += expr_array[i]->ops->size;
6710
6711                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6712                                              sizeof(struct nft_set_elem_expr) + size);
6713                 if (err < 0)
6714                         goto err_parse_key_end;
6715         }
6716
6717         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6718                 obj = nft_obj_lookup(ctx->net, ctx->table,
6719                                      nla[NFTA_SET_ELEM_OBJREF],
6720                                      set->objtype, genmask);
6721                 if (IS_ERR(obj)) {
6722                         err = PTR_ERR(obj);
6723                         obj = NULL;
6724                         goto err_parse_key_end;
6725                 }
6726
6727                 if (!nft_use_inc(&obj->use)) {
6728                         err = -EMFILE;
6729                         obj = NULL;
6730                         goto err_parse_key_end;
6731                 }
6732
6733                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6734                 if (err < 0)
6735                         goto err_parse_key_end;
6736         }
6737
6738         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6739                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6740                                              nla[NFTA_SET_ELEM_DATA]);
6741                 if (err < 0)
6742                         goto err_parse_key_end;
6743
6744                 dreg = nft_type_to_reg(set->dtype);
6745                 list_for_each_entry(binding, &set->bindings, list) {
6746                         struct nft_ctx bind_ctx = {
6747                                 .net    = ctx->net,
6748                                 .family = ctx->family,
6749                                 .table  = ctx->table,
6750                                 .chain  = (struct nft_chain *)binding->chain,
6751                         };
6752
6753                         if (!(binding->flags & NFT_SET_MAP))
6754                                 continue;
6755
6756                         err = nft_validate_register_store(&bind_ctx, dreg,
6757                                                           &elem.data.val,
6758                                                           desc.type, desc.len);
6759                         if (err < 0)
6760                                 goto err_parse_data;
6761
6762                         if (desc.type == NFT_DATA_VERDICT &&
6763                             (elem.data.val.verdict.code == NFT_GOTO ||
6764                              elem.data.val.verdict.code == NFT_JUMP))
6765                                 nft_validate_state_update(ctx->table,
6766                                                           NFT_VALIDATE_NEED);
6767                 }
6768
6769                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6770                 if (err < 0)
6771                         goto err_parse_data;
6772         }
6773
6774         /* The full maximum length of userdata can exceed the maximum
6775          * offset value (U8_MAX) for following extensions, therefor it
6776          * must be the last extension added.
6777          */
6778         ulen = 0;
6779         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6780                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6781                 if (ulen > 0) {
6782                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6783                                                      ulen);
6784                         if (err < 0)
6785                                 goto err_parse_data;
6786                 }
6787         }
6788
6789         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6790                                       elem.key_end.val.data, elem.data.val.data,
6791                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6792         if (IS_ERR(elem.priv)) {
6793                 err = PTR_ERR(elem.priv);
6794                 goto err_parse_data;
6795         }
6796
6797         ext = nft_set_elem_ext(set, elem.priv);
6798         if (flags)
6799                 *nft_set_ext_flags(ext) = flags;
6800
6801         if (obj)
6802                 *nft_set_ext_obj(ext) = obj;
6803
6804         if (ulen > 0) {
6805                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6806                         err = -EINVAL;
6807                         goto err_elem_free;
6808                 }
6809                 udata = nft_set_ext_userdata(ext);
6810                 udata->len = ulen - 1;
6811                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6812         }
6813         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6814         if (err < 0)
6815                 goto err_elem_free;
6816
6817         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6818         if (trans == NULL) {
6819                 err = -ENOMEM;
6820                 goto err_elem_free;
6821         }
6822
6823         ext->genmask = nft_genmask_cur(ctx->net);
6824
6825         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6826         if (err) {
6827                 if (err == -EEXIST) {
6828                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6829                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6830                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6831                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6832                                 goto err_element_clash;
6833                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6834                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6835                              memcmp(nft_set_ext_data(ext),
6836                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6837                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6838                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6839                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6840                                 goto err_element_clash;
6841                         else if (!(nlmsg_flags & NLM_F_EXCL))
6842                                 err = 0;
6843                 } else if (err == -ENOTEMPTY) {
6844                         /* ENOTEMPTY reports overlapping between this element
6845                          * and an existing one.
6846                          */
6847                         err = -EEXIST;
6848                 }
6849                 goto err_element_clash;
6850         }
6851
6852         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6853                 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6854
6855                 if (!atomic_add_unless(&set->nelems, 1, max)) {
6856                         err = -ENFILE;
6857                         goto err_set_full;
6858                 }
6859         }
6860
6861         nft_trans_elem(trans) = elem;
6862         nft_trans_commit_list_add_tail(ctx->net, trans);
6863         return 0;
6864
6865 err_set_full:
6866         nft_setelem_remove(ctx->net, set, &elem);
6867 err_element_clash:
6868         kfree(trans);
6869 err_elem_free:
6870         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6871 err_parse_data:
6872         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6873                 nft_data_release(&elem.data.val, desc.type);
6874 err_parse_key_end:
6875         if (obj)
6876                 nft_use_dec_restore(&obj->use);
6877
6878         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6879 err_parse_key:
6880         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6881 err_set_elem_expr:
6882         for (i = 0; i < num_exprs && expr_array[i]; i++)
6883                 nft_expr_destroy(ctx, expr_array[i]);
6884 err_set_elem_expr_clone:
6885         return err;
6886 }
6887
6888 static int nf_tables_newsetelem(struct sk_buff *skb,
6889                                 const struct nfnl_info *info,
6890                                 const struct nlattr * const nla[])
6891 {
6892         struct netlink_ext_ack *extack = info->extack;
6893         u8 genmask = nft_genmask_next(info->net);
6894         u8 family = info->nfmsg->nfgen_family;
6895         struct net *net = info->net;
6896         const struct nlattr *attr;
6897         struct nft_table *table;
6898         struct nft_set *set;
6899         struct nft_ctx ctx;
6900         int rem, err;
6901
6902         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6903                 return -EINVAL;
6904
6905         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6906                                  genmask, NETLINK_CB(skb).portid);
6907         if (IS_ERR(table)) {
6908                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6909                 return PTR_ERR(table);
6910         }
6911
6912         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6913                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6914         if (IS_ERR(set))
6915                 return PTR_ERR(set);
6916
6917         if (!list_empty(&set->bindings) &&
6918             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6919                 return -EBUSY;
6920
6921         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6922
6923         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6924                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6925                 if (err < 0) {
6926                         NL_SET_BAD_ATTR(extack, attr);
6927                         return err;
6928                 }
6929         }
6930
6931         if (table->validate_state == NFT_VALIDATE_DO)
6932                 return nft_table_validate(net, table);
6933
6934         return 0;
6935 }
6936
6937 /**
6938  *      nft_data_hold - hold a nft_data item
6939  *
6940  *      @data: struct nft_data to release
6941  *      @type: type of data
6942  *
6943  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6944  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6945  *      NFT_GOTO verdicts. This function must be called on active data objects
6946  *      from the second phase of the commit protocol.
6947  */
6948 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6949 {
6950         struct nft_chain *chain;
6951
6952         if (type == NFT_DATA_VERDICT) {
6953                 switch (data->verdict.code) {
6954                 case NFT_JUMP:
6955                 case NFT_GOTO:
6956                         chain = data->verdict.chain;
6957                         nft_use_inc_restore(&chain->use);
6958                         break;
6959                 }
6960         }
6961 }
6962
6963 static void nft_setelem_data_activate(const struct net *net,
6964                                       const struct nft_set *set,
6965                                       struct nft_set_elem *elem)
6966 {
6967         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6968
6969         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6970                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6971         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6972                 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
6973 }
6974
6975 void nft_setelem_data_deactivate(const struct net *net,
6976                                  const struct nft_set *set,
6977                                  struct nft_set_elem *elem)
6978 {
6979         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6980
6981         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6982                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6983         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6984                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6985 }
6986
6987 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6988                            const struct nlattr *attr)
6989 {
6990         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6991         struct nft_set_ext_tmpl tmpl;
6992         struct nft_set_elem elem;
6993         struct nft_set_ext *ext;
6994         struct nft_trans *trans;
6995         u32 flags = 0;
6996         int err;
6997
6998         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6999                                           nft_set_elem_policy, NULL);
7000         if (err < 0)
7001                 return err;
7002
7003         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7004         if (err < 0)
7005                 return err;
7006
7007         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7008                 return -EINVAL;
7009
7010         if (!nft_setelem_valid_key_end(set, nla, flags))
7011                 return -EINVAL;
7012
7013         nft_set_ext_prepare(&tmpl);
7014
7015         if (flags != 0) {
7016                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7017                 if (err < 0)
7018                         return err;
7019         }
7020
7021         if (nla[NFTA_SET_ELEM_KEY]) {
7022                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7023                                             nla[NFTA_SET_ELEM_KEY]);
7024                 if (err < 0)
7025                         return err;
7026
7027                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7028                 if (err < 0)
7029                         goto fail_elem;
7030         }
7031
7032         if (nla[NFTA_SET_ELEM_KEY_END]) {
7033                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7034                                             nla[NFTA_SET_ELEM_KEY_END]);
7035                 if (err < 0)
7036                         goto fail_elem;
7037
7038                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7039                 if (err < 0)
7040                         goto fail_elem_key_end;
7041         }
7042
7043         err = -ENOMEM;
7044         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7045                                       elem.key_end.val.data, NULL, 0, 0,
7046                                       GFP_KERNEL_ACCOUNT);
7047         if (IS_ERR(elem.priv)) {
7048                 err = PTR_ERR(elem.priv);
7049                 goto fail_elem_key_end;
7050         }
7051
7052         ext = nft_set_elem_ext(set, elem.priv);
7053         if (flags)
7054                 *nft_set_ext_flags(ext) = flags;
7055
7056         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7057         if (trans == NULL)
7058                 goto fail_trans;
7059
7060         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7061         if (err < 0)
7062                 goto fail_ops;
7063
7064         nft_setelem_data_deactivate(ctx->net, set, &elem);
7065
7066         nft_trans_elem(trans) = elem;
7067         nft_trans_commit_list_add_tail(ctx->net, trans);
7068         return 0;
7069
7070 fail_ops:
7071         kfree(trans);
7072 fail_trans:
7073         kfree(elem.priv);
7074 fail_elem_key_end:
7075         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7076 fail_elem:
7077         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7078         return err;
7079 }
7080
7081 static int nft_setelem_flush(const struct nft_ctx *ctx,
7082                              struct nft_set *set,
7083                              const struct nft_set_iter *iter,
7084                              struct nft_set_elem *elem)
7085 {
7086         struct nft_trans *trans;
7087         int err;
7088
7089         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7090                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
7091         if (!trans)
7092                 return -ENOMEM;
7093
7094         if (!set->ops->flush(ctx->net, set, elem->priv)) {
7095                 err = -ENOENT;
7096                 goto err1;
7097         }
7098         set->ndeact++;
7099
7100         nft_setelem_data_deactivate(ctx->net, set, elem);
7101         nft_trans_elem_set(trans) = set;
7102         nft_trans_elem(trans) = *elem;
7103         nft_trans_commit_list_add_tail(ctx->net, trans);
7104
7105         return 0;
7106 err1:
7107         kfree(trans);
7108         return err;
7109 }
7110
7111 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7112                                     struct nft_set *set,
7113                                     struct nft_set_elem *elem)
7114 {
7115         struct nft_trans *trans;
7116
7117         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7118                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
7119         if (!trans)
7120                 return -ENOMEM;
7121
7122         nft_setelem_data_deactivate(ctx->net, set, elem);
7123         nft_trans_elem_set(trans) = set;
7124         nft_trans_elem(trans) = *elem;
7125         nft_trans_commit_list_add_tail(ctx->net, trans);
7126
7127         return 0;
7128 }
7129
7130 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7131                                   struct nft_set *set)
7132 {
7133         u8 genmask = nft_genmask_next(ctx->net);
7134         struct nft_set_elem_catchall *catchall;
7135         struct nft_set_elem elem;
7136         struct nft_set_ext *ext;
7137         int ret = 0;
7138
7139         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7140                 ext = nft_set_elem_ext(set, catchall->elem);
7141                 if (!nft_set_elem_active(ext, genmask))
7142                         continue;
7143
7144                 elem.priv = catchall->elem;
7145                 ret = __nft_set_catchall_flush(ctx, set, &elem);
7146                 if (ret < 0)
7147                         break;
7148                 nft_set_elem_change_active(ctx->net, set, ext);
7149         }
7150
7151         return ret;
7152 }
7153
7154 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7155 {
7156         struct nft_set_iter iter = {
7157                 .genmask        = genmask,
7158                 .fn             = nft_setelem_flush,
7159         };
7160
7161         set->ops->walk(ctx, set, &iter);
7162         if (!iter.err)
7163                 iter.err = nft_set_catchall_flush(ctx, set);
7164
7165         return iter.err;
7166 }
7167
7168 static int nf_tables_delsetelem(struct sk_buff *skb,
7169                                 const struct nfnl_info *info,
7170                                 const struct nlattr * const nla[])
7171 {
7172         struct netlink_ext_ack *extack = info->extack;
7173         u8 genmask = nft_genmask_next(info->net);
7174         u8 family = info->nfmsg->nfgen_family;
7175         struct net *net = info->net;
7176         const struct nlattr *attr;
7177         struct nft_table *table;
7178         struct nft_set *set;
7179         struct nft_ctx ctx;
7180         int rem, err = 0;
7181
7182         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7183                                  genmask, NETLINK_CB(skb).portid);
7184         if (IS_ERR(table)) {
7185                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7186                 return PTR_ERR(table);
7187         }
7188
7189         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7190         if (IS_ERR(set))
7191                 return PTR_ERR(set);
7192
7193         if (nft_set_is_anonymous(set))
7194                 return -EOPNOTSUPP;
7195
7196         if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7197                 return -EBUSY;
7198
7199         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7200
7201         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7202                 return nft_set_flush(&ctx, set, genmask);
7203
7204         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7205                 err = nft_del_setelem(&ctx, set, attr);
7206                 if (err == -ENOENT &&
7207                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7208                         continue;
7209
7210                 if (err < 0) {
7211                         NL_SET_BAD_ATTR(extack, attr);
7212                         break;
7213                 }
7214         }
7215         return err;
7216 }
7217
7218 /*
7219  * Stateful objects
7220  */
7221
7222 /**
7223  *      nft_register_obj- register nf_tables stateful object type
7224  *      @obj_type: object type
7225  *
7226  *      Registers the object type for use with nf_tables. Returns zero on
7227  *      success or a negative errno code otherwise.
7228  */
7229 int nft_register_obj(struct nft_object_type *obj_type)
7230 {
7231         if (obj_type->type == NFT_OBJECT_UNSPEC)
7232                 return -EINVAL;
7233
7234         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7235         list_add_rcu(&obj_type->list, &nf_tables_objects);
7236         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7237         return 0;
7238 }
7239 EXPORT_SYMBOL_GPL(nft_register_obj);
7240
7241 /**
7242  *      nft_unregister_obj - unregister nf_tables object type
7243  *      @obj_type: object type
7244  *
7245  *      Unregisters the object type for use with nf_tables.
7246  */
7247 void nft_unregister_obj(struct nft_object_type *obj_type)
7248 {
7249         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7250         list_del_rcu(&obj_type->list);
7251         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7252 }
7253 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7254
7255 struct nft_object *nft_obj_lookup(const struct net *net,
7256                                   const struct nft_table *table,
7257                                   const struct nlattr *nla, u32 objtype,
7258                                   u8 genmask)
7259 {
7260         struct nft_object_hash_key k = { .table = table };
7261         char search[NFT_OBJ_MAXNAMELEN];
7262         struct rhlist_head *tmp, *list;
7263         struct nft_object *obj;
7264
7265         nla_strscpy(search, nla, sizeof(search));
7266         k.name = search;
7267
7268         WARN_ON_ONCE(!rcu_read_lock_held() &&
7269                      !lockdep_commit_lock_is_held(net));
7270
7271         rcu_read_lock();
7272         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7273         if (!list)
7274                 goto out;
7275
7276         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7277                 if (objtype == obj->ops->type->type &&
7278                     nft_active_genmask(obj, genmask)) {
7279                         rcu_read_unlock();
7280                         return obj;
7281                 }
7282         }
7283 out:
7284         rcu_read_unlock();
7285         return ERR_PTR(-ENOENT);
7286 }
7287 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7288
7289 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7290                                                   const struct nlattr *nla,
7291                                                   u32 objtype, u8 genmask)
7292 {
7293         struct nft_object *obj;
7294
7295         list_for_each_entry(obj, &table->objects, list) {
7296                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7297                     objtype == obj->ops->type->type &&
7298                     nft_active_genmask(obj, genmask))
7299                         return obj;
7300         }
7301         return ERR_PTR(-ENOENT);
7302 }
7303
7304 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7305         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7306                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7307         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7308                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7309         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7310         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7311         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7312         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7313                                     .len = NFT_USERDATA_MAXLEN },
7314 };
7315
7316 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7317                                        const struct nft_object_type *type,
7318                                        const struct nlattr *attr)
7319 {
7320         struct nlattr **tb;
7321         const struct nft_object_ops *ops;
7322         struct nft_object *obj;
7323         int err = -ENOMEM;
7324
7325         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7326         if (!tb)
7327                 goto err1;
7328
7329         if (attr) {
7330                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7331                                                   type->policy, NULL);
7332                 if (err < 0)
7333                         goto err2;
7334         } else {
7335                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7336         }
7337
7338         if (type->select_ops) {
7339                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7340                 if (IS_ERR(ops)) {
7341                         err = PTR_ERR(ops);
7342                         goto err2;
7343                 }
7344         } else {
7345                 ops = type->ops;
7346         }
7347
7348         err = -ENOMEM;
7349         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7350         if (!obj)
7351                 goto err2;
7352
7353         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7354         if (err < 0)
7355                 goto err3;
7356
7357         obj->ops = ops;
7358
7359         kfree(tb);
7360         return obj;
7361 err3:
7362         kfree(obj);
7363 err2:
7364         kfree(tb);
7365 err1:
7366         return ERR_PTR(err);
7367 }
7368
7369 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7370                            struct nft_object *obj, bool reset)
7371 {
7372         struct nlattr *nest;
7373
7374         nest = nla_nest_start_noflag(skb, attr);
7375         if (!nest)
7376                 goto nla_put_failure;
7377         if (obj->ops->dump(skb, obj, reset) < 0)
7378                 goto nla_put_failure;
7379         nla_nest_end(skb, nest);
7380         return 0;
7381
7382 nla_put_failure:
7383         return -1;
7384 }
7385
7386 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7387 {
7388         const struct nft_object_type *type;
7389
7390         list_for_each_entry(type, &nf_tables_objects, list) {
7391                 if (objtype == type->type)
7392                         return type;
7393         }
7394         return NULL;
7395 }
7396
7397 static const struct nft_object_type *
7398 nft_obj_type_get(struct net *net, u32 objtype)
7399 {
7400         const struct nft_object_type *type;
7401
7402         type = __nft_obj_type_get(objtype);
7403         if (type != NULL && try_module_get(type->owner))
7404                 return type;
7405
7406         lockdep_nfnl_nft_mutex_not_held();
7407 #ifdef CONFIG_MODULES
7408         if (type == NULL) {
7409                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7410                         return ERR_PTR(-EAGAIN);
7411         }
7412 #endif
7413         return ERR_PTR(-ENOENT);
7414 }
7415
7416 static int nf_tables_updobj(const struct nft_ctx *ctx,
7417                             const struct nft_object_type *type,
7418                             const struct nlattr *attr,
7419                             struct nft_object *obj)
7420 {
7421         struct nft_object *newobj;
7422         struct nft_trans *trans;
7423         int err = -ENOMEM;
7424
7425         if (!try_module_get(type->owner))
7426                 return -ENOENT;
7427
7428         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7429                                 sizeof(struct nft_trans_obj));
7430         if (!trans)
7431                 goto err_trans;
7432
7433         newobj = nft_obj_init(ctx, type, attr);
7434         if (IS_ERR(newobj)) {
7435                 err = PTR_ERR(newobj);
7436                 goto err_free_trans;
7437         }
7438
7439         nft_trans_obj(trans) = obj;
7440         nft_trans_obj_update(trans) = true;
7441         nft_trans_obj_newobj(trans) = newobj;
7442         nft_trans_commit_list_add_tail(ctx->net, trans);
7443
7444         return 0;
7445
7446 err_free_trans:
7447         kfree(trans);
7448 err_trans:
7449         module_put(type->owner);
7450         return err;
7451 }
7452
7453 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7454                             const struct nlattr * const nla[])
7455 {
7456         struct netlink_ext_ack *extack = info->extack;
7457         u8 genmask = nft_genmask_next(info->net);
7458         u8 family = info->nfmsg->nfgen_family;
7459         const struct nft_object_type *type;
7460         struct net *net = info->net;
7461         struct nft_table *table;
7462         struct nft_object *obj;
7463         struct nft_ctx ctx;
7464         u32 objtype;
7465         int err;
7466
7467         if (!nla[NFTA_OBJ_TYPE] ||
7468             !nla[NFTA_OBJ_NAME] ||
7469             !nla[NFTA_OBJ_DATA])
7470                 return -EINVAL;
7471
7472         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7473                                  NETLINK_CB(skb).portid);
7474         if (IS_ERR(table)) {
7475                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7476                 return PTR_ERR(table);
7477         }
7478
7479         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7480         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7481         if (IS_ERR(obj)) {
7482                 err = PTR_ERR(obj);
7483                 if (err != -ENOENT) {
7484                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7485                         return err;
7486                 }
7487         } else {
7488                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7489                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7490                         return -EEXIST;
7491                 }
7492                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7493                         return -EOPNOTSUPP;
7494
7495                 type = __nft_obj_type_get(objtype);
7496                 if (WARN_ON_ONCE(!type))
7497                         return -ENOENT;
7498
7499                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7500
7501                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7502         }
7503
7504         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7505
7506         if (!nft_use_inc(&table->use))
7507                 return -EMFILE;
7508
7509         type = nft_obj_type_get(net, objtype);
7510         if (IS_ERR(type)) {
7511                 err = PTR_ERR(type);
7512                 goto err_type;
7513         }
7514
7515         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7516         if (IS_ERR(obj)) {
7517                 err = PTR_ERR(obj);
7518                 goto err_init;
7519         }
7520         obj->key.table = table;
7521         obj->handle = nf_tables_alloc_handle(table);
7522
7523         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7524         if (!obj->key.name) {
7525                 err = -ENOMEM;
7526                 goto err_strdup;
7527         }
7528
7529         if (nla[NFTA_OBJ_USERDATA]) {
7530                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7531                 if (obj->udata == NULL)
7532                         goto err_userdata;
7533
7534                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7535         }
7536
7537         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7538         if (err < 0)
7539                 goto err_trans;
7540
7541         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7542                               nft_objname_ht_params);
7543         if (err < 0)
7544                 goto err_obj_ht;
7545
7546         list_add_tail_rcu(&obj->list, &table->objects);
7547
7548         return 0;
7549 err_obj_ht:
7550         /* queued in transaction log */
7551         INIT_LIST_HEAD(&obj->list);
7552         return err;
7553 err_trans:
7554         kfree(obj->udata);
7555 err_userdata:
7556         kfree(obj->key.name);
7557 err_strdup:
7558         if (obj->ops->destroy)
7559                 obj->ops->destroy(&ctx, obj);
7560         kfree(obj);
7561 err_init:
7562         module_put(type->owner);
7563 err_type:
7564         nft_use_dec_restore(&table->use);
7565
7566         return err;
7567 }
7568
7569 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7570                                    u32 portid, u32 seq, int event, u32 flags,
7571                                    int family, const struct nft_table *table,
7572                                    struct nft_object *obj, bool reset)
7573 {
7574         struct nlmsghdr *nlh;
7575
7576         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7577         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7578                            NFNETLINK_V0, nft_base_seq(net));
7579         if (!nlh)
7580                 goto nla_put_failure;
7581
7582         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7583             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7584             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7585                          NFTA_OBJ_PAD))
7586                 goto nla_put_failure;
7587
7588         if (event == NFT_MSG_DELOBJ) {
7589                 nlmsg_end(skb, nlh);
7590                 return 0;
7591         }
7592
7593         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7594             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7595             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7596                 goto nla_put_failure;
7597
7598         if (obj->udata &&
7599             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7600                 goto nla_put_failure;
7601
7602         nlmsg_end(skb, nlh);
7603         return 0;
7604
7605 nla_put_failure:
7606         nlmsg_trim(skb, nlh);
7607         return -1;
7608 }
7609
7610 static void audit_log_obj_reset(const struct nft_table *table,
7611                                 unsigned int base_seq, unsigned int nentries)
7612 {
7613         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7614
7615         audit_log_nfcfg(buf, table->family, nentries,
7616                         AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7617         kfree(buf);
7618 }
7619
7620 struct nft_obj_filter {
7621         char            *table;
7622         u32             type;
7623 };
7624
7625 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7626 {
7627         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7628         const struct nft_table *table;
7629         unsigned int idx = 0, s_idx = cb->args[0];
7630         struct nft_obj_filter *filter = cb->data;
7631         struct net *net = sock_net(skb->sk);
7632         int family = nfmsg->nfgen_family;
7633         struct nftables_pernet *nft_net;
7634         unsigned int entries = 0;
7635         struct nft_object *obj;
7636         bool reset = false;
7637         int rc = 0;
7638
7639         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7640                 reset = true;
7641
7642         rcu_read_lock();
7643         nft_net = nft_pernet(net);
7644         cb->seq = READ_ONCE(nft_net->base_seq);
7645
7646         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7647                 if (family != NFPROTO_UNSPEC && family != table->family)
7648                         continue;
7649
7650                 entries = 0;
7651                 list_for_each_entry_rcu(obj, &table->objects, list) {
7652                         if (!nft_is_active(net, obj))
7653                                 goto cont;
7654                         if (idx < s_idx)
7655                                 goto cont;
7656                         if (idx > s_idx)
7657                                 memset(&cb->args[1], 0,
7658                                        sizeof(cb->args) - sizeof(cb->args[0]));
7659                         if (filter && filter->table &&
7660                             strcmp(filter->table, table->name))
7661                                 goto cont;
7662                         if (filter &&
7663                             filter->type != NFT_OBJECT_UNSPEC &&
7664                             obj->ops->type->type != filter->type)
7665                                 goto cont;
7666
7667                         rc = nf_tables_fill_obj_info(skb, net,
7668                                                      NETLINK_CB(cb->skb).portid,
7669                                                      cb->nlh->nlmsg_seq,
7670                                                      NFT_MSG_NEWOBJ,
7671                                                      NLM_F_MULTI | NLM_F_APPEND,
7672                                                      table->family, table,
7673                                                      obj, reset);
7674                         if (rc < 0)
7675                                 break;
7676
7677                         entries++;
7678                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7679 cont:
7680                         idx++;
7681                 }
7682                 if (reset && entries)
7683                         audit_log_obj_reset(table, nft_net->base_seq, entries);
7684                 if (rc < 0)
7685                         break;
7686         }
7687         rcu_read_unlock();
7688
7689         cb->args[0] = idx;
7690         return skb->len;
7691 }
7692
7693 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7694 {
7695         const struct nlattr * const *nla = cb->data;
7696         struct nft_obj_filter *filter = NULL;
7697
7698         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7699                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7700                 if (!filter)
7701                         return -ENOMEM;
7702
7703                 if (nla[NFTA_OBJ_TABLE]) {
7704                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7705                         if (!filter->table) {
7706                                 kfree(filter);
7707                                 return -ENOMEM;
7708                         }
7709                 }
7710
7711                 if (nla[NFTA_OBJ_TYPE])
7712                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7713         }
7714
7715         cb->data = filter;
7716         return 0;
7717 }
7718
7719 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7720 {
7721         struct nft_obj_filter *filter = cb->data;
7722
7723         if (filter) {
7724                 kfree(filter->table);
7725                 kfree(filter);
7726         }
7727
7728         return 0;
7729 }
7730
7731 /* called with rcu_read_lock held */
7732 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7733                             const struct nlattr * const nla[])
7734 {
7735         struct netlink_ext_ack *extack = info->extack;
7736         u8 genmask = nft_genmask_cur(info->net);
7737         u8 family = info->nfmsg->nfgen_family;
7738         const struct nft_table *table;
7739         struct net *net = info->net;
7740         struct nft_object *obj;
7741         struct sk_buff *skb2;
7742         bool reset = false;
7743         u32 objtype;
7744         int err;
7745
7746         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7747                 struct netlink_dump_control c = {
7748                         .start = nf_tables_dump_obj_start,
7749                         .dump = nf_tables_dump_obj,
7750                         .done = nf_tables_dump_obj_done,
7751                         .module = THIS_MODULE,
7752                         .data = (void *)nla,
7753                 };
7754
7755                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7756         }
7757
7758         if (!nla[NFTA_OBJ_NAME] ||
7759             !nla[NFTA_OBJ_TYPE])
7760                 return -EINVAL;
7761
7762         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7763         if (IS_ERR(table)) {
7764                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7765                 return PTR_ERR(table);
7766         }
7767
7768         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7769         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7770         if (IS_ERR(obj)) {
7771                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7772                 return PTR_ERR(obj);
7773         }
7774
7775         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7776         if (!skb2)
7777                 return -ENOMEM;
7778
7779         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7780                 reset = true;
7781
7782         if (reset) {
7783                 const struct nftables_pernet *nft_net;
7784                 char *buf;
7785
7786                 nft_net = nft_pernet(net);
7787                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7788
7789                 audit_log_nfcfg(buf,
7790                                 family,
7791                                 1,
7792                                 AUDIT_NFT_OP_OBJ_RESET,
7793                                 GFP_ATOMIC);
7794                 kfree(buf);
7795         }
7796
7797         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7798                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7799                                       family, table, obj, reset);
7800         if (err < 0)
7801                 goto err_fill_obj_info;
7802
7803         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7804
7805 err_fill_obj_info:
7806         kfree_skb(skb2);
7807         return err;
7808 }
7809
7810 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7811 {
7812         if (obj->ops->destroy)
7813                 obj->ops->destroy(ctx, obj);
7814
7815         module_put(obj->ops->type->owner);
7816         kfree(obj->key.name);
7817         kfree(obj->udata);
7818         kfree(obj);
7819 }
7820
7821 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7822                             const struct nlattr * const nla[])
7823 {
7824         struct netlink_ext_ack *extack = info->extack;
7825         u8 genmask = nft_genmask_next(info->net);
7826         u8 family = info->nfmsg->nfgen_family;
7827         struct net *net = info->net;
7828         const struct nlattr *attr;
7829         struct nft_table *table;
7830         struct nft_object *obj;
7831         struct nft_ctx ctx;
7832         u32 objtype;
7833
7834         if (!nla[NFTA_OBJ_TYPE] ||
7835             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7836                 return -EINVAL;
7837
7838         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7839                                  NETLINK_CB(skb).portid);
7840         if (IS_ERR(table)) {
7841                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7842                 return PTR_ERR(table);
7843         }
7844
7845         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7846         if (nla[NFTA_OBJ_HANDLE]) {
7847                 attr = nla[NFTA_OBJ_HANDLE];
7848                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7849         } else {
7850                 attr = nla[NFTA_OBJ_NAME];
7851                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7852         }
7853
7854         if (IS_ERR(obj)) {
7855                 if (PTR_ERR(obj) == -ENOENT &&
7856                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7857                         return 0;
7858
7859                 NL_SET_BAD_ATTR(extack, attr);
7860                 return PTR_ERR(obj);
7861         }
7862         if (obj->use > 0) {
7863                 NL_SET_BAD_ATTR(extack, attr);
7864                 return -EBUSY;
7865         }
7866
7867         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7868
7869         return nft_delobj(&ctx, obj);
7870 }
7871
7872 static void
7873 __nft_obj_notify(struct net *net, const struct nft_table *table,
7874                  struct nft_object *obj, u32 portid, u32 seq, int event,
7875                  u16 flags, int family, int report, gfp_t gfp)
7876 {
7877         struct nftables_pernet *nft_net = nft_pernet(net);
7878         struct sk_buff *skb;
7879         int err;
7880
7881         if (!report &&
7882             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7883                 return;
7884
7885         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7886         if (skb == NULL)
7887                 goto err;
7888
7889         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7890                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7891                                       family, table, obj, false);
7892         if (err < 0) {
7893                 kfree_skb(skb);
7894                 goto err;
7895         }
7896
7897         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7898         return;
7899 err:
7900         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7901 }
7902
7903 void nft_obj_notify(struct net *net, const struct nft_table *table,
7904                     struct nft_object *obj, u32 portid, u32 seq, int event,
7905                     u16 flags, int family, int report, gfp_t gfp)
7906 {
7907         struct nftables_pernet *nft_net = nft_pernet(net);
7908         char *buf = kasprintf(gfp, "%s:%u",
7909                               table->name, nft_net->base_seq);
7910
7911         audit_log_nfcfg(buf,
7912                         family,
7913                         obj->handle,
7914                         event == NFT_MSG_NEWOBJ ?
7915                                  AUDIT_NFT_OP_OBJ_REGISTER :
7916                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7917                         gfp);
7918         kfree(buf);
7919
7920         __nft_obj_notify(net, table, obj, portid, seq, event,
7921                          flags, family, report, gfp);
7922 }
7923 EXPORT_SYMBOL_GPL(nft_obj_notify);
7924
7925 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7926                                  struct nft_object *obj, int event)
7927 {
7928         __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
7929                          ctx->seq, event, ctx->flags, ctx->family,
7930                          ctx->report, GFP_KERNEL);
7931 }
7932
7933 /*
7934  * Flow tables
7935  */
7936 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7937 {
7938         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7939         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7940         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7941 }
7942 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7943
7944 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7945 {
7946         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7947         list_del_rcu(&type->list);
7948         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7949 }
7950 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7951
7952 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7953         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7954                                             .len = NFT_NAME_MAXLEN - 1 },
7955         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7956                                             .len = NFT_NAME_MAXLEN - 1 },
7957         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7958         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7959         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7960 };
7961
7962 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7963                                            const struct nlattr *nla, u8 genmask)
7964 {
7965         struct nft_flowtable *flowtable;
7966
7967         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7968                 if (!nla_strcmp(nla, flowtable->name) &&
7969                     nft_active_genmask(flowtable, genmask))
7970                         return flowtable;
7971         }
7972         return ERR_PTR(-ENOENT);
7973 }
7974 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7975
7976 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7977                                     struct nft_flowtable *flowtable,
7978                                     enum nft_trans_phase phase)
7979 {
7980         switch (phase) {
7981         case NFT_TRANS_PREPARE_ERROR:
7982         case NFT_TRANS_PREPARE:
7983         case NFT_TRANS_ABORT:
7984         case NFT_TRANS_RELEASE:
7985                 nft_use_dec(&flowtable->use);
7986                 fallthrough;
7987         default:
7988                 return;
7989         }
7990 }
7991 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7992
7993 static struct nft_flowtable *
7994 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7995                               const struct nlattr *nla, u8 genmask)
7996 {
7997        struct nft_flowtable *flowtable;
7998
7999        list_for_each_entry(flowtable, &table->flowtables, list) {
8000                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8001                    nft_active_genmask(flowtable, genmask))
8002                        return flowtable;
8003        }
8004        return ERR_PTR(-ENOENT);
8005 }
8006
8007 struct nft_flowtable_hook {
8008         u32                     num;
8009         int                     priority;
8010         struct list_head        list;
8011 };
8012
8013 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8014         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
8015         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
8016         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
8017 };
8018
8019 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8020                                     const struct nlattr * const nla[],
8021                                     struct nft_flowtable_hook *flowtable_hook,
8022                                     struct nft_flowtable *flowtable,
8023                                     struct netlink_ext_ack *extack, bool add)
8024 {
8025         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8026         struct nft_hook *hook;
8027         int hooknum, priority;
8028         int err;
8029
8030         INIT_LIST_HEAD(&flowtable_hook->list);
8031
8032         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8033                                           nla[NFTA_FLOWTABLE_HOOK],
8034                                           nft_flowtable_hook_policy, NULL);
8035         if (err < 0)
8036                 return err;
8037
8038         if (add) {
8039                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8040                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8041                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8042                         return -ENOENT;
8043                 }
8044
8045                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8046                 if (hooknum != NF_NETDEV_INGRESS)
8047                         return -EOPNOTSUPP;
8048
8049                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8050
8051                 flowtable_hook->priority        = priority;
8052                 flowtable_hook->num             = hooknum;
8053         } else {
8054                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8055                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8056                         if (hooknum != flowtable->hooknum)
8057                                 return -EOPNOTSUPP;
8058                 }
8059
8060                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8061                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8062                         if (priority != flowtable->data.priority)
8063                                 return -EOPNOTSUPP;
8064                 }
8065
8066                 flowtable_hook->priority        = flowtable->data.priority;
8067                 flowtable_hook->num             = flowtable->hooknum;
8068         }
8069
8070         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8071                 err = nf_tables_parse_netdev_hooks(ctx->net,
8072                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
8073                                                    &flowtable_hook->list,
8074                                                    extack);
8075                 if (err < 0)
8076                         return err;
8077         }
8078
8079         list_for_each_entry(hook, &flowtable_hook->list, list) {
8080                 hook->ops.pf            = NFPROTO_NETDEV;
8081                 hook->ops.hooknum       = flowtable_hook->num;
8082                 hook->ops.priority      = flowtable_hook->priority;
8083                 hook->ops.priv          = &flowtable->data;
8084                 hook->ops.hook          = flowtable->data.type->hook;
8085         }
8086
8087         return err;
8088 }
8089
8090 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8091 {
8092         const struct nf_flowtable_type *type;
8093
8094         list_for_each_entry(type, &nf_tables_flowtables, list) {
8095                 if (family == type->family)
8096                         return type;
8097         }
8098         return NULL;
8099 }
8100
8101 static const struct nf_flowtable_type *
8102 nft_flowtable_type_get(struct net *net, u8 family)
8103 {
8104         const struct nf_flowtable_type *type;
8105
8106         type = __nft_flowtable_type_get(family);
8107         if (type != NULL && try_module_get(type->owner))
8108                 return type;
8109
8110         lockdep_nfnl_nft_mutex_not_held();
8111 #ifdef CONFIG_MODULES
8112         if (type == NULL) {
8113                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8114                         return ERR_PTR(-EAGAIN);
8115         }
8116 #endif
8117         return ERR_PTR(-ENOENT);
8118 }
8119
8120 /* Only called from error and netdev event paths. */
8121 static void nft_unregister_flowtable_hook(struct net *net,
8122                                           struct nft_flowtable *flowtable,
8123                                           struct nft_hook *hook)
8124 {
8125         nf_unregister_net_hook(net, &hook->ops);
8126         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8127                                     FLOW_BLOCK_UNBIND);
8128 }
8129
8130 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8131                                                  struct list_head *hook_list,
8132                                                  bool release_netdev)
8133 {
8134         struct nft_hook *hook, *next;
8135
8136         list_for_each_entry_safe(hook, next, hook_list, list) {
8137                 nf_unregister_net_hook(net, &hook->ops);
8138                 if (release_netdev) {
8139                         list_del(&hook->list);
8140                         kfree_rcu(hook, rcu);
8141                 }
8142         }
8143 }
8144
8145 static void nft_unregister_flowtable_net_hooks(struct net *net,
8146                                                struct list_head *hook_list)
8147 {
8148         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8149 }
8150
8151 static int nft_register_flowtable_net_hooks(struct net *net,
8152                                             struct nft_table *table,
8153                                             struct list_head *hook_list,
8154                                             struct nft_flowtable *flowtable)
8155 {
8156         struct nft_hook *hook, *hook2, *next;
8157         struct nft_flowtable *ft;
8158         int err, i = 0;
8159
8160         list_for_each_entry(hook, hook_list, list) {
8161                 list_for_each_entry(ft, &table->flowtables, list) {
8162                         if (!nft_is_active_next(net, ft))
8163                                 continue;
8164
8165                         list_for_each_entry(hook2, &ft->hook_list, list) {
8166                                 if (hook->ops.dev == hook2->ops.dev &&
8167                                     hook->ops.pf == hook2->ops.pf) {
8168                                         err = -EEXIST;
8169                                         goto err_unregister_net_hooks;
8170                                 }
8171                         }
8172                 }
8173
8174                 err = flowtable->data.type->setup(&flowtable->data,
8175                                                   hook->ops.dev,
8176                                                   FLOW_BLOCK_BIND);
8177                 if (err < 0)
8178                         goto err_unregister_net_hooks;
8179
8180                 err = nf_register_net_hook(net, &hook->ops);
8181                 if (err < 0) {
8182                         flowtable->data.type->setup(&flowtable->data,
8183                                                     hook->ops.dev,
8184                                                     FLOW_BLOCK_UNBIND);
8185                         goto err_unregister_net_hooks;
8186                 }
8187
8188                 i++;
8189         }
8190
8191         return 0;
8192
8193 err_unregister_net_hooks:
8194         list_for_each_entry_safe(hook, next, hook_list, list) {
8195                 if (i-- <= 0)
8196                         break;
8197
8198                 nft_unregister_flowtable_hook(net, flowtable, hook);
8199                 list_del_rcu(&hook->list);
8200                 kfree_rcu(hook, rcu);
8201         }
8202
8203         return err;
8204 }
8205
8206 static void nft_hooks_destroy(struct list_head *hook_list)
8207 {
8208         struct nft_hook *hook, *next;
8209
8210         list_for_each_entry_safe(hook, next, hook_list, list) {
8211                 list_del_rcu(&hook->list);
8212                 kfree_rcu(hook, rcu);
8213         }
8214 }
8215
8216 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8217                                 struct nft_flowtable *flowtable,
8218                                 struct netlink_ext_ack *extack)
8219 {
8220         const struct nlattr * const *nla = ctx->nla;
8221         struct nft_flowtable_hook flowtable_hook;
8222         struct nft_hook *hook, *next;
8223         struct nft_trans *trans;
8224         bool unregister = false;
8225         u32 flags;
8226         int err;
8227
8228         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8229                                        extack, false);
8230         if (err < 0)
8231                 return err;
8232
8233         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8234                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8235                         list_del(&hook->list);
8236                         kfree(hook);
8237                 }
8238         }
8239
8240         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8241                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8242                 if (flags & ~NFT_FLOWTABLE_MASK) {
8243                         err = -EOPNOTSUPP;
8244                         goto err_flowtable_update_hook;
8245                 }
8246                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8247                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8248                         err = -EOPNOTSUPP;
8249                         goto err_flowtable_update_hook;
8250                 }
8251         } else {
8252                 flags = flowtable->data.flags;
8253         }
8254
8255         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8256                                                &flowtable_hook.list, flowtable);
8257         if (err < 0)
8258                 goto err_flowtable_update_hook;
8259
8260         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8261                                 sizeof(struct nft_trans_flowtable));
8262         if (!trans) {
8263                 unregister = true;
8264                 err = -ENOMEM;
8265                 goto err_flowtable_update_hook;
8266         }
8267
8268         nft_trans_flowtable_flags(trans) = flags;
8269         nft_trans_flowtable(trans) = flowtable;
8270         nft_trans_flowtable_update(trans) = true;
8271         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8272         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8273
8274         nft_trans_commit_list_add_tail(ctx->net, trans);
8275
8276         return 0;
8277
8278 err_flowtable_update_hook:
8279         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8280                 if (unregister)
8281                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8282                 list_del_rcu(&hook->list);
8283                 kfree_rcu(hook, rcu);
8284         }
8285
8286         return err;
8287
8288 }
8289
8290 static int nf_tables_newflowtable(struct sk_buff *skb,
8291                                   const struct nfnl_info *info,
8292                                   const struct nlattr * const nla[])
8293 {
8294         struct netlink_ext_ack *extack = info->extack;
8295         struct nft_flowtable_hook flowtable_hook;
8296         u8 genmask = nft_genmask_next(info->net);
8297         u8 family = info->nfmsg->nfgen_family;
8298         const struct nf_flowtable_type *type;
8299         struct nft_flowtable *flowtable;
8300         struct nft_hook *hook, *next;
8301         struct net *net = info->net;
8302         struct nft_table *table;
8303         struct nft_ctx ctx;
8304         int err;
8305
8306         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8307             !nla[NFTA_FLOWTABLE_NAME] ||
8308             !nla[NFTA_FLOWTABLE_HOOK])
8309                 return -EINVAL;
8310
8311         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8312                                  genmask, NETLINK_CB(skb).portid);
8313         if (IS_ERR(table)) {
8314                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8315                 return PTR_ERR(table);
8316         }
8317
8318         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8319                                          genmask);
8320         if (IS_ERR(flowtable)) {
8321                 err = PTR_ERR(flowtable);
8322                 if (err != -ENOENT) {
8323                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8324                         return err;
8325                 }
8326         } else {
8327                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8328                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8329                         return -EEXIST;
8330                 }
8331
8332                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8333
8334                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8335         }
8336
8337         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8338
8339         if (!nft_use_inc(&table->use))
8340                 return -EMFILE;
8341
8342         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8343         if (!flowtable) {
8344                 err = -ENOMEM;
8345                 goto flowtable_alloc;
8346         }
8347
8348         flowtable->table = table;
8349         flowtable->handle = nf_tables_alloc_handle(table);
8350         INIT_LIST_HEAD(&flowtable->hook_list);
8351
8352         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8353         if (!flowtable->name) {
8354                 err = -ENOMEM;
8355                 goto err1;
8356         }
8357
8358         type = nft_flowtable_type_get(net, family);
8359         if (IS_ERR(type)) {
8360                 err = PTR_ERR(type);
8361                 goto err2;
8362         }
8363
8364         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8365                 flowtable->data.flags =
8366                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8367                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8368                         err = -EOPNOTSUPP;
8369                         goto err3;
8370                 }
8371         }
8372
8373         write_pnet(&flowtable->data.net, net);
8374         flowtable->data.type = type;
8375         err = type->init(&flowtable->data);
8376         if (err < 0)
8377                 goto err3;
8378
8379         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8380                                        extack, true);
8381         if (err < 0)
8382                 goto err4;
8383
8384         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8385         flowtable->data.priority = flowtable_hook.priority;
8386         flowtable->hooknum = flowtable_hook.num;
8387
8388         err = nft_register_flowtable_net_hooks(ctx.net, table,
8389                                                &flowtable->hook_list,
8390                                                flowtable);
8391         if (err < 0) {
8392                 nft_hooks_destroy(&flowtable->hook_list);
8393                 goto err4;
8394         }
8395
8396         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8397         if (err < 0)
8398                 goto err5;
8399
8400         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8401
8402         return 0;
8403 err5:
8404         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8405                 nft_unregister_flowtable_hook(net, flowtable, hook);
8406                 list_del_rcu(&hook->list);
8407                 kfree_rcu(hook, rcu);
8408         }
8409 err4:
8410         flowtable->data.type->free(&flowtable->data);
8411 err3:
8412         module_put(type->owner);
8413 err2:
8414         kfree(flowtable->name);
8415 err1:
8416         kfree(flowtable);
8417 flowtable_alloc:
8418         nft_use_dec_restore(&table->use);
8419
8420         return err;
8421 }
8422
8423 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8424 {
8425         struct nft_hook *this, *next;
8426
8427         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8428                 list_del(&this->list);
8429                 kfree(this);
8430         }
8431 }
8432
8433 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8434                                  struct nft_flowtable *flowtable,
8435                                  struct netlink_ext_ack *extack)
8436 {
8437         const struct nlattr * const *nla = ctx->nla;
8438         struct nft_flowtable_hook flowtable_hook;
8439         LIST_HEAD(flowtable_del_list);
8440         struct nft_hook *this, *hook;
8441         struct nft_trans *trans;
8442         int err;
8443
8444         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8445                                        extack, false);
8446         if (err < 0)
8447                 return err;
8448
8449         list_for_each_entry(this, &flowtable_hook.list, list) {
8450                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8451                 if (!hook) {
8452                         err = -ENOENT;
8453                         goto err_flowtable_del_hook;
8454                 }
8455                 list_move(&hook->list, &flowtable_del_list);
8456         }
8457
8458         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8459                                 sizeof(struct nft_trans_flowtable));
8460         if (!trans) {
8461                 err = -ENOMEM;
8462                 goto err_flowtable_del_hook;
8463         }
8464
8465         nft_trans_flowtable(trans) = flowtable;
8466         nft_trans_flowtable_update(trans) = true;
8467         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8468         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8469         nft_flowtable_hook_release(&flowtable_hook);
8470
8471         nft_trans_commit_list_add_tail(ctx->net, trans);
8472
8473         return 0;
8474
8475 err_flowtable_del_hook:
8476         list_splice(&flowtable_del_list, &flowtable->hook_list);
8477         nft_flowtable_hook_release(&flowtable_hook);
8478
8479         return err;
8480 }
8481
8482 static int nf_tables_delflowtable(struct sk_buff *skb,
8483                                   const struct nfnl_info *info,
8484                                   const struct nlattr * const nla[])
8485 {
8486         struct netlink_ext_ack *extack = info->extack;
8487         u8 genmask = nft_genmask_next(info->net);
8488         u8 family = info->nfmsg->nfgen_family;
8489         struct nft_flowtable *flowtable;
8490         struct net *net = info->net;
8491         const struct nlattr *attr;
8492         struct nft_table *table;
8493         struct nft_ctx ctx;
8494
8495         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8496             (!nla[NFTA_FLOWTABLE_NAME] &&
8497              !nla[NFTA_FLOWTABLE_HANDLE]))
8498                 return -EINVAL;
8499
8500         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8501                                  genmask, NETLINK_CB(skb).portid);
8502         if (IS_ERR(table)) {
8503                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8504                 return PTR_ERR(table);
8505         }
8506
8507         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8508                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8509                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8510         } else {
8511                 attr = nla[NFTA_FLOWTABLE_NAME];
8512                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8513         }
8514
8515         if (IS_ERR(flowtable)) {
8516                 if (PTR_ERR(flowtable) == -ENOENT &&
8517                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8518                         return 0;
8519
8520                 NL_SET_BAD_ATTR(extack, attr);
8521                 return PTR_ERR(flowtable);
8522         }
8523
8524         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8525
8526         if (nla[NFTA_FLOWTABLE_HOOK])
8527                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8528
8529         if (flowtable->use > 0) {
8530                 NL_SET_BAD_ATTR(extack, attr);
8531                 return -EBUSY;
8532         }
8533
8534         return nft_delflowtable(&ctx, flowtable);
8535 }
8536
8537 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8538                                          u32 portid, u32 seq, int event,
8539                                          u32 flags, int family,
8540                                          struct nft_flowtable *flowtable,
8541                                          struct list_head *hook_list)
8542 {
8543         struct nlattr *nest, *nest_devs;
8544         struct nft_hook *hook;
8545         struct nlmsghdr *nlh;
8546
8547         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8548         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8549                            NFNETLINK_V0, nft_base_seq(net));
8550         if (!nlh)
8551                 goto nla_put_failure;
8552
8553         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8554             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8555             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8556                          NFTA_FLOWTABLE_PAD))
8557                 goto nla_put_failure;
8558
8559         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8560                 nlmsg_end(skb, nlh);
8561                 return 0;
8562         }
8563
8564         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8565             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8566                 goto nla_put_failure;
8567
8568         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8569         if (!nest)
8570                 goto nla_put_failure;
8571         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8572             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8573                 goto nla_put_failure;
8574
8575         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8576         if (!nest_devs)
8577                 goto nla_put_failure;
8578
8579         if (!hook_list)
8580                 hook_list = &flowtable->hook_list;
8581
8582         list_for_each_entry_rcu(hook, hook_list, list) {
8583                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8584                         goto nla_put_failure;
8585         }
8586         nla_nest_end(skb, nest_devs);
8587         nla_nest_end(skb, nest);
8588
8589         nlmsg_end(skb, nlh);
8590         return 0;
8591
8592 nla_put_failure:
8593         nlmsg_trim(skb, nlh);
8594         return -1;
8595 }
8596
8597 struct nft_flowtable_filter {
8598         char            *table;
8599 };
8600
8601 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8602                                     struct netlink_callback *cb)
8603 {
8604         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8605         struct nft_flowtable_filter *filter = cb->data;
8606         unsigned int idx = 0, s_idx = cb->args[0];
8607         struct net *net = sock_net(skb->sk);
8608         int family = nfmsg->nfgen_family;
8609         struct nft_flowtable *flowtable;
8610         struct nftables_pernet *nft_net;
8611         const struct nft_table *table;
8612
8613         rcu_read_lock();
8614         nft_net = nft_pernet(net);
8615         cb->seq = READ_ONCE(nft_net->base_seq);
8616
8617         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8618                 if (family != NFPROTO_UNSPEC && family != table->family)
8619                         continue;
8620
8621                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8622                         if (!nft_is_active(net, flowtable))
8623                                 goto cont;
8624                         if (idx < s_idx)
8625                                 goto cont;
8626                         if (idx > s_idx)
8627                                 memset(&cb->args[1], 0,
8628                                        sizeof(cb->args) - sizeof(cb->args[0]));
8629                         if (filter && filter->table &&
8630                             strcmp(filter->table, table->name))
8631                                 goto cont;
8632
8633                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8634                                                           cb->nlh->nlmsg_seq,
8635                                                           NFT_MSG_NEWFLOWTABLE,
8636                                                           NLM_F_MULTI | NLM_F_APPEND,
8637                                                           table->family,
8638                                                           flowtable, NULL) < 0)
8639                                 goto done;
8640
8641                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8642 cont:
8643                         idx++;
8644                 }
8645         }
8646 done:
8647         rcu_read_unlock();
8648
8649         cb->args[0] = idx;
8650         return skb->len;
8651 }
8652
8653 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8654 {
8655         const struct nlattr * const *nla = cb->data;
8656         struct nft_flowtable_filter *filter = NULL;
8657
8658         if (nla[NFTA_FLOWTABLE_TABLE]) {
8659                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8660                 if (!filter)
8661                         return -ENOMEM;
8662
8663                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8664                                            GFP_ATOMIC);
8665                 if (!filter->table) {
8666                         kfree(filter);
8667                         return -ENOMEM;
8668                 }
8669         }
8670
8671         cb->data = filter;
8672         return 0;
8673 }
8674
8675 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8676 {
8677         struct nft_flowtable_filter *filter = cb->data;
8678
8679         if (!filter)
8680                 return 0;
8681
8682         kfree(filter->table);
8683         kfree(filter);
8684
8685         return 0;
8686 }
8687
8688 /* called with rcu_read_lock held */
8689 static int nf_tables_getflowtable(struct sk_buff *skb,
8690                                   const struct nfnl_info *info,
8691                                   const struct nlattr * const nla[])
8692 {
8693         u8 genmask = nft_genmask_cur(info->net);
8694         u8 family = info->nfmsg->nfgen_family;
8695         struct nft_flowtable *flowtable;
8696         const struct nft_table *table;
8697         struct net *net = info->net;
8698         struct sk_buff *skb2;
8699         int err;
8700
8701         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8702                 struct netlink_dump_control c = {
8703                         .start = nf_tables_dump_flowtable_start,
8704                         .dump = nf_tables_dump_flowtable,
8705                         .done = nf_tables_dump_flowtable_done,
8706                         .module = THIS_MODULE,
8707                         .data = (void *)nla,
8708                 };
8709
8710                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8711         }
8712
8713         if (!nla[NFTA_FLOWTABLE_NAME])
8714                 return -EINVAL;
8715
8716         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8717                                  genmask, 0);
8718         if (IS_ERR(table))
8719                 return PTR_ERR(table);
8720
8721         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8722                                          genmask);
8723         if (IS_ERR(flowtable))
8724                 return PTR_ERR(flowtable);
8725
8726         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8727         if (!skb2)
8728                 return -ENOMEM;
8729
8730         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8731                                             info->nlh->nlmsg_seq,
8732                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8733                                             flowtable, NULL);
8734         if (err < 0)
8735                 goto err_fill_flowtable_info;
8736
8737         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8738
8739 err_fill_flowtable_info:
8740         kfree_skb(skb2);
8741         return err;
8742 }
8743
8744 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8745                                        struct nft_flowtable *flowtable,
8746                                        struct list_head *hook_list, int event)
8747 {
8748         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8749         struct sk_buff *skb;
8750         u16 flags = 0;
8751         int err;
8752
8753         if (!ctx->report &&
8754             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8755                 return;
8756
8757         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8758         if (skb == NULL)
8759                 goto err;
8760
8761         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8762                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8763
8764         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8765                                             ctx->seq, event, flags,
8766                                             ctx->family, flowtable, hook_list);
8767         if (err < 0) {
8768                 kfree_skb(skb);
8769                 goto err;
8770         }
8771
8772         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8773         return;
8774 err:
8775         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8776 }
8777
8778 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8779 {
8780         struct nft_hook *hook, *next;
8781
8782         flowtable->data.type->free(&flowtable->data);
8783         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8784                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8785                                             FLOW_BLOCK_UNBIND);
8786                 list_del_rcu(&hook->list);
8787                 kfree(hook);
8788         }
8789         kfree(flowtable->name);
8790         module_put(flowtable->data.type->owner);
8791         kfree(flowtable);
8792 }
8793
8794 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8795                                    u32 portid, u32 seq)
8796 {
8797         struct nftables_pernet *nft_net = nft_pernet(net);
8798         struct nlmsghdr *nlh;
8799         char buf[TASK_COMM_LEN];
8800         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8801
8802         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8803                            NFNETLINK_V0, nft_base_seq(net));
8804         if (!nlh)
8805                 goto nla_put_failure;
8806
8807         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8808             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8809             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8810                 goto nla_put_failure;
8811
8812         nlmsg_end(skb, nlh);
8813         return 0;
8814
8815 nla_put_failure:
8816         nlmsg_trim(skb, nlh);
8817         return -EMSGSIZE;
8818 }
8819
8820 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8821                                 struct nft_flowtable *flowtable)
8822 {
8823         struct nft_hook *hook;
8824
8825         list_for_each_entry(hook, &flowtable->hook_list, list) {
8826                 if (hook->ops.dev != dev)
8827                         continue;
8828
8829                 /* flow_offload_netdev_event() cleans up entries for us. */
8830                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8831                 list_del_rcu(&hook->list);
8832                 kfree_rcu(hook, rcu);
8833                 break;
8834         }
8835 }
8836
8837 static int nf_tables_flowtable_event(struct notifier_block *this,
8838                                      unsigned long event, void *ptr)
8839 {
8840         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8841         struct nft_flowtable *flowtable;
8842         struct nftables_pernet *nft_net;
8843         struct nft_table *table;
8844         struct net *net;
8845
8846         if (event != NETDEV_UNREGISTER)
8847                 return 0;
8848
8849         net = dev_net(dev);
8850         nft_net = nft_pernet(net);
8851         mutex_lock(&nft_net->commit_mutex);
8852         list_for_each_entry(table, &nft_net->tables, list) {
8853                 list_for_each_entry(flowtable, &table->flowtables, list) {
8854                         nft_flowtable_event(event, dev, flowtable);
8855                 }
8856         }
8857         mutex_unlock(&nft_net->commit_mutex);
8858
8859         return NOTIFY_DONE;
8860 }
8861
8862 static struct notifier_block nf_tables_flowtable_notifier = {
8863         .notifier_call  = nf_tables_flowtable_event,
8864 };
8865
8866 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8867                                  int event)
8868 {
8869         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8870         struct sk_buff *skb2;
8871         int err;
8872
8873         if (!nlmsg_report(nlh) &&
8874             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8875                 return;
8876
8877         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8878         if (skb2 == NULL)
8879                 goto err;
8880
8881         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8882                                       nlh->nlmsg_seq);
8883         if (err < 0) {
8884                 kfree_skb(skb2);
8885                 goto err;
8886         }
8887
8888         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8889                        nlmsg_report(nlh), GFP_KERNEL);
8890         return;
8891 err:
8892         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8893                           -ENOBUFS);
8894 }
8895
8896 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8897                             const struct nlattr * const nla[])
8898 {
8899         struct sk_buff *skb2;
8900         int err;
8901
8902         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8903         if (skb2 == NULL)
8904                 return -ENOMEM;
8905
8906         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8907                                       info->nlh->nlmsg_seq);
8908         if (err < 0)
8909                 goto err_fill_gen_info;
8910
8911         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8912
8913 err_fill_gen_info:
8914         kfree_skb(skb2);
8915         return err;
8916 }
8917
8918 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8919         [NFT_MSG_NEWTABLE] = {
8920                 .call           = nf_tables_newtable,
8921                 .type           = NFNL_CB_BATCH,
8922                 .attr_count     = NFTA_TABLE_MAX,
8923                 .policy         = nft_table_policy,
8924         },
8925         [NFT_MSG_GETTABLE] = {
8926                 .call           = nf_tables_gettable,
8927                 .type           = NFNL_CB_RCU,
8928                 .attr_count     = NFTA_TABLE_MAX,
8929                 .policy         = nft_table_policy,
8930         },
8931         [NFT_MSG_DELTABLE] = {
8932                 .call           = nf_tables_deltable,
8933                 .type           = NFNL_CB_BATCH,
8934                 .attr_count     = NFTA_TABLE_MAX,
8935                 .policy         = nft_table_policy,
8936         },
8937         [NFT_MSG_DESTROYTABLE] = {
8938                 .call           = nf_tables_deltable,
8939                 .type           = NFNL_CB_BATCH,
8940                 .attr_count     = NFTA_TABLE_MAX,
8941                 .policy         = nft_table_policy,
8942         },
8943         [NFT_MSG_NEWCHAIN] = {
8944                 .call           = nf_tables_newchain,
8945                 .type           = NFNL_CB_BATCH,
8946                 .attr_count     = NFTA_CHAIN_MAX,
8947                 .policy         = nft_chain_policy,
8948         },
8949         [NFT_MSG_GETCHAIN] = {
8950                 .call           = nf_tables_getchain,
8951                 .type           = NFNL_CB_RCU,
8952                 .attr_count     = NFTA_CHAIN_MAX,
8953                 .policy         = nft_chain_policy,
8954         },
8955         [NFT_MSG_DELCHAIN] = {
8956                 .call           = nf_tables_delchain,
8957                 .type           = NFNL_CB_BATCH,
8958                 .attr_count     = NFTA_CHAIN_MAX,
8959                 .policy         = nft_chain_policy,
8960         },
8961         [NFT_MSG_DESTROYCHAIN] = {
8962                 .call           = nf_tables_delchain,
8963                 .type           = NFNL_CB_BATCH,
8964                 .attr_count     = NFTA_CHAIN_MAX,
8965                 .policy         = nft_chain_policy,
8966         },
8967         [NFT_MSG_NEWRULE] = {
8968                 .call           = nf_tables_newrule,
8969                 .type           = NFNL_CB_BATCH,
8970                 .attr_count     = NFTA_RULE_MAX,
8971                 .policy         = nft_rule_policy,
8972         },
8973         [NFT_MSG_GETRULE] = {
8974                 .call           = nf_tables_getrule,
8975                 .type           = NFNL_CB_RCU,
8976                 .attr_count     = NFTA_RULE_MAX,
8977                 .policy         = nft_rule_policy,
8978         },
8979         [NFT_MSG_GETRULE_RESET] = {
8980                 .call           = nf_tables_getrule,
8981                 .type           = NFNL_CB_RCU,
8982                 .attr_count     = NFTA_RULE_MAX,
8983                 .policy         = nft_rule_policy,
8984         },
8985         [NFT_MSG_DELRULE] = {
8986                 .call           = nf_tables_delrule,
8987                 .type           = NFNL_CB_BATCH,
8988                 .attr_count     = NFTA_RULE_MAX,
8989                 .policy         = nft_rule_policy,
8990         },
8991         [NFT_MSG_DESTROYRULE] = {
8992                 .call           = nf_tables_delrule,
8993                 .type           = NFNL_CB_BATCH,
8994                 .attr_count     = NFTA_RULE_MAX,
8995                 .policy         = nft_rule_policy,
8996         },
8997         [NFT_MSG_NEWSET] = {
8998                 .call           = nf_tables_newset,
8999                 .type           = NFNL_CB_BATCH,
9000                 .attr_count     = NFTA_SET_MAX,
9001                 .policy         = nft_set_policy,
9002         },
9003         [NFT_MSG_GETSET] = {
9004                 .call           = nf_tables_getset,
9005                 .type           = NFNL_CB_RCU,
9006                 .attr_count     = NFTA_SET_MAX,
9007                 .policy         = nft_set_policy,
9008         },
9009         [NFT_MSG_DELSET] = {
9010                 .call           = nf_tables_delset,
9011                 .type           = NFNL_CB_BATCH,
9012                 .attr_count     = NFTA_SET_MAX,
9013                 .policy         = nft_set_policy,
9014         },
9015         [NFT_MSG_DESTROYSET] = {
9016                 .call           = nf_tables_delset,
9017                 .type           = NFNL_CB_BATCH,
9018                 .attr_count     = NFTA_SET_MAX,
9019                 .policy         = nft_set_policy,
9020         },
9021         [NFT_MSG_NEWSETELEM] = {
9022                 .call           = nf_tables_newsetelem,
9023                 .type           = NFNL_CB_BATCH,
9024                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9025                 .policy         = nft_set_elem_list_policy,
9026         },
9027         [NFT_MSG_GETSETELEM] = {
9028                 .call           = nf_tables_getsetelem,
9029                 .type           = NFNL_CB_RCU,
9030                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9031                 .policy         = nft_set_elem_list_policy,
9032         },
9033         [NFT_MSG_GETSETELEM_RESET] = {
9034                 .call           = nf_tables_getsetelem,
9035                 .type           = NFNL_CB_RCU,
9036                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9037                 .policy         = nft_set_elem_list_policy,
9038         },
9039         [NFT_MSG_DELSETELEM] = {
9040                 .call           = nf_tables_delsetelem,
9041                 .type           = NFNL_CB_BATCH,
9042                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9043                 .policy         = nft_set_elem_list_policy,
9044         },
9045         [NFT_MSG_DESTROYSETELEM] = {
9046                 .call           = nf_tables_delsetelem,
9047                 .type           = NFNL_CB_BATCH,
9048                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9049                 .policy         = nft_set_elem_list_policy,
9050         },
9051         [NFT_MSG_GETGEN] = {
9052                 .call           = nf_tables_getgen,
9053                 .type           = NFNL_CB_RCU,
9054         },
9055         [NFT_MSG_NEWOBJ] = {
9056                 .call           = nf_tables_newobj,
9057                 .type           = NFNL_CB_BATCH,
9058                 .attr_count     = NFTA_OBJ_MAX,
9059                 .policy         = nft_obj_policy,
9060         },
9061         [NFT_MSG_GETOBJ] = {
9062                 .call           = nf_tables_getobj,
9063                 .type           = NFNL_CB_RCU,
9064                 .attr_count     = NFTA_OBJ_MAX,
9065                 .policy         = nft_obj_policy,
9066         },
9067         [NFT_MSG_DELOBJ] = {
9068                 .call           = nf_tables_delobj,
9069                 .type           = NFNL_CB_BATCH,
9070                 .attr_count     = NFTA_OBJ_MAX,
9071                 .policy         = nft_obj_policy,
9072         },
9073         [NFT_MSG_DESTROYOBJ] = {
9074                 .call           = nf_tables_delobj,
9075                 .type           = NFNL_CB_BATCH,
9076                 .attr_count     = NFTA_OBJ_MAX,
9077                 .policy         = nft_obj_policy,
9078         },
9079         [NFT_MSG_GETOBJ_RESET] = {
9080                 .call           = nf_tables_getobj,
9081                 .type           = NFNL_CB_RCU,
9082                 .attr_count     = NFTA_OBJ_MAX,
9083                 .policy         = nft_obj_policy,
9084         },
9085         [NFT_MSG_NEWFLOWTABLE] = {
9086                 .call           = nf_tables_newflowtable,
9087                 .type           = NFNL_CB_BATCH,
9088                 .attr_count     = NFTA_FLOWTABLE_MAX,
9089                 .policy         = nft_flowtable_policy,
9090         },
9091         [NFT_MSG_GETFLOWTABLE] = {
9092                 .call           = nf_tables_getflowtable,
9093                 .type           = NFNL_CB_RCU,
9094                 .attr_count     = NFTA_FLOWTABLE_MAX,
9095                 .policy         = nft_flowtable_policy,
9096         },
9097         [NFT_MSG_DELFLOWTABLE] = {
9098                 .call           = nf_tables_delflowtable,
9099                 .type           = NFNL_CB_BATCH,
9100                 .attr_count     = NFTA_FLOWTABLE_MAX,
9101                 .policy         = nft_flowtable_policy,
9102         },
9103         [NFT_MSG_DESTROYFLOWTABLE] = {
9104                 .call           = nf_tables_delflowtable,
9105                 .type           = NFNL_CB_BATCH,
9106                 .attr_count     = NFTA_FLOWTABLE_MAX,
9107                 .policy         = nft_flowtable_policy,
9108         },
9109 };
9110
9111 static int nf_tables_validate(struct net *net)
9112 {
9113         struct nftables_pernet *nft_net = nft_pernet(net);
9114         struct nft_table *table;
9115
9116         list_for_each_entry(table, &nft_net->tables, list) {
9117                 switch (table->validate_state) {
9118                 case NFT_VALIDATE_SKIP:
9119                         continue;
9120                 case NFT_VALIDATE_NEED:
9121                         nft_validate_state_update(table, NFT_VALIDATE_DO);
9122                         fallthrough;
9123                 case NFT_VALIDATE_DO:
9124                         if (nft_table_validate(net, table) < 0)
9125                                 return -EAGAIN;
9126
9127                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9128                         break;
9129                 }
9130         }
9131
9132         return 0;
9133 }
9134
9135 /* a drop policy has to be deferred until all rules have been activated,
9136  * otherwise a large ruleset that contains a drop-policy base chain will
9137  * cause all packets to get dropped until the full transaction has been
9138  * processed.
9139  *
9140  * We defer the drop policy until the transaction has been finalized.
9141  */
9142 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9143 {
9144         struct nft_base_chain *basechain;
9145
9146         if (nft_trans_chain_policy(trans) != NF_DROP)
9147                 return;
9148
9149         if (!nft_is_base_chain(trans->ctx.chain))
9150                 return;
9151
9152         basechain = nft_base_chain(trans->ctx.chain);
9153         basechain->policy = NF_DROP;
9154 }
9155
9156 static void nft_chain_commit_update(struct nft_trans *trans)
9157 {
9158         struct nft_base_chain *basechain;
9159
9160         if (nft_trans_chain_name(trans)) {
9161                 rhltable_remove(&trans->ctx.table->chains_ht,
9162                                 &trans->ctx.chain->rhlhead,
9163                                 nft_chain_ht_params);
9164                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9165                 rhltable_insert_key(&trans->ctx.table->chains_ht,
9166                                     trans->ctx.chain->name,
9167                                     &trans->ctx.chain->rhlhead,
9168                                     nft_chain_ht_params);
9169         }
9170
9171         if (!nft_is_base_chain(trans->ctx.chain))
9172                 return;
9173
9174         nft_chain_stats_replace(trans);
9175
9176         basechain = nft_base_chain(trans->ctx.chain);
9177
9178         switch (nft_trans_chain_policy(trans)) {
9179         case NF_DROP:
9180         case NF_ACCEPT:
9181                 basechain->policy = nft_trans_chain_policy(trans);
9182                 break;
9183         }
9184 }
9185
9186 static void nft_obj_commit_update(struct nft_trans *trans)
9187 {
9188         struct nft_object *newobj;
9189         struct nft_object *obj;
9190
9191         obj = nft_trans_obj(trans);
9192         newobj = nft_trans_obj_newobj(trans);
9193
9194         if (obj->ops->update)
9195                 obj->ops->update(obj, newobj);
9196
9197         nft_obj_destroy(&trans->ctx, newobj);
9198 }
9199
9200 static void nft_commit_release(struct nft_trans *trans)
9201 {
9202         switch (trans->msg_type) {
9203         case NFT_MSG_DELTABLE:
9204         case NFT_MSG_DESTROYTABLE:
9205                 nf_tables_table_destroy(&trans->ctx);
9206                 break;
9207         case NFT_MSG_NEWCHAIN:
9208                 free_percpu(nft_trans_chain_stats(trans));
9209                 kfree(nft_trans_chain_name(trans));
9210                 break;
9211         case NFT_MSG_DELCHAIN:
9212         case NFT_MSG_DESTROYCHAIN:
9213                 if (nft_trans_chain_update(trans))
9214                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9215                 else
9216                         nf_tables_chain_destroy(&trans->ctx);
9217                 break;
9218         case NFT_MSG_DELRULE:
9219         case NFT_MSG_DESTROYRULE:
9220                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9221                 break;
9222         case NFT_MSG_DELSET:
9223         case NFT_MSG_DESTROYSET:
9224                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9225                 break;
9226         case NFT_MSG_DELSETELEM:
9227         case NFT_MSG_DESTROYSETELEM:
9228                 nf_tables_set_elem_destroy(&trans->ctx,
9229                                            nft_trans_elem_set(trans),
9230                                            nft_trans_elem(trans).priv);
9231                 break;
9232         case NFT_MSG_DELOBJ:
9233         case NFT_MSG_DESTROYOBJ:
9234                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9235                 break;
9236         case NFT_MSG_DELFLOWTABLE:
9237         case NFT_MSG_DESTROYFLOWTABLE:
9238                 if (nft_trans_flowtable_update(trans))
9239                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9240                 else
9241                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9242                 break;
9243         }
9244
9245         if (trans->put_net)
9246                 put_net(trans->ctx.net);
9247
9248         kfree(trans);
9249 }
9250
9251 static void nf_tables_trans_destroy_work(struct work_struct *w)
9252 {
9253         struct nft_trans *trans, *next;
9254         LIST_HEAD(head);
9255
9256         spin_lock(&nf_tables_destroy_list_lock);
9257         list_splice_init(&nf_tables_destroy_list, &head);
9258         spin_unlock(&nf_tables_destroy_list_lock);
9259
9260         if (list_empty(&head))
9261                 return;
9262
9263         synchronize_rcu();
9264
9265         list_for_each_entry_safe(trans, next, &head, list) {
9266                 nft_trans_list_del(trans);
9267                 nft_commit_release(trans);
9268         }
9269 }
9270
9271 void nf_tables_trans_destroy_flush_work(void)
9272 {
9273         flush_work(&trans_destroy_work);
9274 }
9275 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9276
9277 static bool nft_expr_reduce(struct nft_regs_track *track,
9278                             const struct nft_expr *expr)
9279 {
9280         return false;
9281 }
9282
9283 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9284 {
9285         const struct nft_expr *expr, *last;
9286         struct nft_regs_track track = {};
9287         unsigned int size, data_size;
9288         void *data, *data_boundary;
9289         struct nft_rule_dp *prule;
9290         struct nft_rule *rule;
9291
9292         /* already handled or inactive chain? */
9293         if (chain->blob_next || !nft_is_active_next(net, chain))
9294                 return 0;
9295
9296         data_size = 0;
9297         list_for_each_entry(rule, &chain->rules, list) {
9298                 if (nft_is_active_next(net, rule)) {
9299                         data_size += sizeof(*prule) + rule->dlen;
9300                         if (data_size > INT_MAX)
9301                                 return -ENOMEM;
9302                 }
9303         }
9304
9305         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9306         if (!chain->blob_next)
9307                 return -ENOMEM;
9308
9309         data = (void *)chain->blob_next->data;
9310         data_boundary = data + data_size;
9311         size = 0;
9312
9313         list_for_each_entry(rule, &chain->rules, list) {
9314                 if (!nft_is_active_next(net, rule))
9315                         continue;
9316
9317                 prule = (struct nft_rule_dp *)data;
9318                 data += offsetof(struct nft_rule_dp, data);
9319                 if (WARN_ON_ONCE(data > data_boundary))
9320                         return -ENOMEM;
9321
9322                 size = 0;
9323                 track.last = nft_expr_last(rule);
9324                 nft_rule_for_each_expr(expr, last, rule) {
9325                         track.cur = expr;
9326
9327                         if (nft_expr_reduce(&track, expr)) {
9328                                 expr = track.cur;
9329                                 continue;
9330                         }
9331
9332                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9333                                 return -ENOMEM;
9334
9335                         memcpy(data + size, expr, expr->ops->size);
9336                         size += expr->ops->size;
9337                 }
9338                 if (WARN_ON_ONCE(size >= 1 << 12))
9339                         return -ENOMEM;
9340
9341                 prule->handle = rule->handle;
9342                 prule->dlen = size;
9343                 prule->is_last = 0;
9344
9345                 data += size;
9346                 size = 0;
9347                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9348         }
9349
9350         if (WARN_ON_ONCE(data > data_boundary))
9351                 return -ENOMEM;
9352
9353         prule = (struct nft_rule_dp *)data;
9354         nft_last_rule(chain, prule);
9355
9356         return 0;
9357 }
9358
9359 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9360 {
9361         struct nftables_pernet *nft_net = nft_pernet(net);
9362         struct nft_trans *trans, *next;
9363
9364         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9365                 struct nft_chain *chain = trans->ctx.chain;
9366
9367                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9368                     trans->msg_type == NFT_MSG_DELRULE) {
9369                         kvfree(chain->blob_next);
9370                         chain->blob_next = NULL;
9371                 }
9372         }
9373 }
9374
9375 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9376 {
9377         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9378
9379         kvfree(l->blob);
9380 }
9381
9382 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9383 {
9384         struct nft_rule_dp_last *last;
9385
9386         /* last rule trailer is after end marker */
9387         last = (void *)blob + sizeof(*blob) + blob->size;
9388         last->blob = blob;
9389
9390         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9391 }
9392
9393 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9394 {
9395         struct nft_rule_blob *g0, *g1;
9396         bool next_genbit;
9397
9398         next_genbit = nft_gencursor_next(net);
9399
9400         g0 = rcu_dereference_protected(chain->blob_gen_0,
9401                                        lockdep_commit_lock_is_held(net));
9402         g1 = rcu_dereference_protected(chain->blob_gen_1,
9403                                        lockdep_commit_lock_is_held(net));
9404
9405         /* No changes to this chain? */
9406         if (chain->blob_next == NULL) {
9407                 /* chain had no change in last or next generation */
9408                 if (g0 == g1)
9409                         return;
9410                 /*
9411                  * chain had no change in this generation; make sure next
9412                  * one uses same rules as current generation.
9413                  */
9414                 if (next_genbit) {
9415                         rcu_assign_pointer(chain->blob_gen_1, g0);
9416                         nf_tables_commit_chain_free_rules_old(g1);
9417                 } else {
9418                         rcu_assign_pointer(chain->blob_gen_0, g1);
9419                         nf_tables_commit_chain_free_rules_old(g0);
9420                 }
9421
9422                 return;
9423         }
9424
9425         if (next_genbit)
9426                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9427         else
9428                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9429
9430         chain->blob_next = NULL;
9431
9432         if (g0 == g1)
9433                 return;
9434
9435         if (next_genbit)
9436                 nf_tables_commit_chain_free_rules_old(g1);
9437         else
9438                 nf_tables_commit_chain_free_rules_old(g0);
9439 }
9440
9441 static void nft_obj_del(struct nft_object *obj)
9442 {
9443         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9444         list_del_rcu(&obj->list);
9445 }
9446
9447 void nft_chain_del(struct nft_chain *chain)
9448 {
9449         struct nft_table *table = chain->table;
9450
9451         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9452                                      nft_chain_ht_params));
9453         list_del_rcu(&chain->list);
9454 }
9455
9456 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9457                                         struct nft_trans_gc *trans)
9458 {
9459         void **priv = trans->priv;
9460         unsigned int i;
9461
9462         for (i = 0; i < trans->count; i++) {
9463                 struct nft_set_elem elem = {
9464                         .priv = priv[i],
9465                 };
9466
9467                 nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9468                 nft_setelem_remove(ctx->net, trans->set, &elem);
9469         }
9470 }
9471
9472 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9473 {
9474         nft_set_put(trans->set);
9475         put_net(trans->net);
9476         kfree(trans);
9477 }
9478
9479 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9480 {
9481         struct nft_set_elem elem = {};
9482         struct nft_trans_gc *trans;
9483         struct nft_ctx ctx = {};
9484         unsigned int i;
9485
9486         trans = container_of(rcu, struct nft_trans_gc, rcu);
9487         ctx.net = read_pnet(&trans->set->net);
9488
9489         for (i = 0; i < trans->count; i++) {
9490                 elem.priv = trans->priv[i];
9491                 if (!nft_setelem_is_catchall(trans->set, &elem))
9492                         atomic_dec(&trans->set->nelems);
9493
9494                 nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9495         }
9496
9497         nft_trans_gc_destroy(trans);
9498 }
9499
9500 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9501 {
9502         struct nftables_pernet *nft_net;
9503         struct nft_ctx ctx = {};
9504
9505         nft_net = nft_pernet(trans->net);
9506
9507         mutex_lock(&nft_net->commit_mutex);
9508
9509         /* Check for race with transaction, otherwise this batch refers to
9510          * stale objects that might not be there anymore. Skip transaction if
9511          * set has been destroyed from control plane transaction in case gc
9512          * worker loses race.
9513          */
9514         if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9515                 mutex_unlock(&nft_net->commit_mutex);
9516                 return false;
9517         }
9518
9519         ctx.net = trans->net;
9520         ctx.table = trans->set->table;
9521
9522         nft_trans_gc_setelem_remove(&ctx, trans);
9523         mutex_unlock(&nft_net->commit_mutex);
9524
9525         return true;
9526 }
9527
9528 static void nft_trans_gc_work(struct work_struct *work)
9529 {
9530         struct nft_trans_gc *trans, *next;
9531         LIST_HEAD(trans_gc_list);
9532
9533         spin_lock(&nf_tables_gc_list_lock);
9534         list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9535         spin_unlock(&nf_tables_gc_list_lock);
9536
9537         list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9538                 list_del(&trans->list);
9539                 if (!nft_trans_gc_work_done(trans)) {
9540                         nft_trans_gc_destroy(trans);
9541                         continue;
9542                 }
9543                 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9544         }
9545 }
9546
9547 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9548                                         unsigned int gc_seq, gfp_t gfp)
9549 {
9550         struct net *net = read_pnet(&set->net);
9551         struct nft_trans_gc *trans;
9552
9553         trans = kzalloc(sizeof(*trans), gfp);
9554         if (!trans)
9555                 return NULL;
9556
9557         trans->net = maybe_get_net(net);
9558         if (!trans->net) {
9559                 kfree(trans);
9560                 return NULL;
9561         }
9562
9563         refcount_inc(&set->refs);
9564         trans->set = set;
9565         trans->seq = gc_seq;
9566
9567         return trans;
9568 }
9569
9570 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9571 {
9572         trans->priv[trans->count++] = priv;
9573 }
9574
9575 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9576 {
9577         spin_lock(&nf_tables_gc_list_lock);
9578         list_add_tail(&trans->list, &nf_tables_gc_list);
9579         spin_unlock(&nf_tables_gc_list_lock);
9580
9581         schedule_work(&trans_gc_work);
9582 }
9583
9584 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9585 {
9586         return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9587 }
9588
9589 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9590                                               unsigned int gc_seq, gfp_t gfp)
9591 {
9592         struct nft_set *set;
9593
9594         if (nft_trans_gc_space(gc))
9595                 return gc;
9596
9597         set = gc->set;
9598         nft_trans_gc_queue_work(gc);
9599
9600         return nft_trans_gc_alloc(set, gc_seq, gfp);
9601 }
9602
9603 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9604 {
9605         if (trans->count == 0) {
9606                 nft_trans_gc_destroy(trans);
9607                 return;
9608         }
9609
9610         nft_trans_gc_queue_work(trans);
9611 }
9612
9613 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9614 {
9615         struct nft_set *set;
9616
9617         if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9618                 return NULL;
9619
9620         if (nft_trans_gc_space(gc))
9621                 return gc;
9622
9623         set = gc->set;
9624         call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9625
9626         return nft_trans_gc_alloc(set, 0, gfp);
9627 }
9628
9629 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9630 {
9631         WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9632
9633         if (trans->count == 0) {
9634                 nft_trans_gc_destroy(trans);
9635                 return;
9636         }
9637
9638         call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9639 }
9640
9641 static struct nft_trans_gc *nft_trans_gc_catchall(struct nft_trans_gc *gc,
9642                                                   unsigned int gc_seq,
9643                                                   bool sync)
9644 {
9645         struct nft_set_elem_catchall *catchall;
9646         const struct nft_set *set = gc->set;
9647         struct nft_set_ext *ext;
9648
9649         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9650                 ext = nft_set_elem_ext(set, catchall->elem);
9651
9652                 if (!nft_set_elem_expired(ext))
9653                         continue;
9654                 if (nft_set_elem_is_dead(ext))
9655                         goto dead_elem;
9656
9657                 nft_set_elem_dead(ext);
9658 dead_elem:
9659                 if (sync)
9660                         gc = nft_trans_gc_queue_sync(gc, GFP_ATOMIC);
9661                 else
9662                         gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9663
9664                 if (!gc)
9665                         return NULL;
9666
9667                 nft_trans_gc_elem_add(gc, catchall->elem);
9668         }
9669
9670         return gc;
9671 }
9672
9673 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9674                                                  unsigned int gc_seq)
9675 {
9676         return nft_trans_gc_catchall(gc, gc_seq, false);
9677 }
9678
9679 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9680 {
9681         return nft_trans_gc_catchall(gc, 0, true);
9682 }
9683
9684 static void nf_tables_module_autoload_cleanup(struct net *net)
9685 {
9686         struct nftables_pernet *nft_net = nft_pernet(net);
9687         struct nft_module_request *req, *next;
9688
9689         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9690         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9691                 WARN_ON_ONCE(!req->done);
9692                 list_del(&req->list);
9693                 kfree(req);
9694         }
9695 }
9696
9697 static void nf_tables_commit_release(struct net *net)
9698 {
9699         struct nftables_pernet *nft_net = nft_pernet(net);
9700         struct nft_trans *trans;
9701
9702         /* all side effects have to be made visible.
9703          * For example, if a chain named 'foo' has been deleted, a
9704          * new transaction must not find it anymore.
9705          *
9706          * Memory reclaim happens asynchronously from work queue
9707          * to prevent expensive synchronize_rcu() in commit phase.
9708          */
9709         if (list_empty(&nft_net->commit_list)) {
9710                 nf_tables_module_autoload_cleanup(net);
9711                 mutex_unlock(&nft_net->commit_mutex);
9712                 return;
9713         }
9714
9715         trans = list_last_entry(&nft_net->commit_list,
9716                                 struct nft_trans, list);
9717         get_net(trans->ctx.net);
9718         WARN_ON_ONCE(trans->put_net);
9719
9720         trans->put_net = true;
9721         spin_lock(&nf_tables_destroy_list_lock);
9722         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9723         spin_unlock(&nf_tables_destroy_list_lock);
9724
9725         nf_tables_module_autoload_cleanup(net);
9726         schedule_work(&trans_destroy_work);
9727
9728         mutex_unlock(&nft_net->commit_mutex);
9729 }
9730
9731 static void nft_commit_notify(struct net *net, u32 portid)
9732 {
9733         struct nftables_pernet *nft_net = nft_pernet(net);
9734         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9735         unsigned char *data;
9736         int len;
9737
9738         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9739                 if (!batch_skb) {
9740 new_batch:
9741                         batch_skb = skb;
9742                         len = NLMSG_GOODSIZE - skb->len;
9743                         list_del(&skb->list);
9744                         continue;
9745                 }
9746                 len -= skb->len;
9747                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9748                         data = skb_put(batch_skb, skb->len);
9749                         memcpy(data, skb->data, skb->len);
9750                         list_del(&skb->list);
9751                         kfree_skb(skb);
9752                         continue;
9753                 }
9754                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9755                                NFT_CB(batch_skb).report, GFP_KERNEL);
9756                 goto new_batch;
9757         }
9758
9759         if (batch_skb) {
9760                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9761                                NFT_CB(batch_skb).report, GFP_KERNEL);
9762         }
9763
9764         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9765 }
9766
9767 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9768                                         struct nft_table *table)
9769 {
9770         struct nft_audit_data *adp;
9771
9772         list_for_each_entry(adp, adl, list) {
9773                 if (adp->table == table)
9774                         return 0;
9775         }
9776         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9777         if (!adp)
9778                 return -ENOMEM;
9779         adp->table = table;
9780         list_add(&adp->list, adl);
9781         return 0;
9782 }
9783
9784 static void nf_tables_commit_audit_free(struct list_head *adl)
9785 {
9786         struct nft_audit_data *adp, *adn;
9787
9788         list_for_each_entry_safe(adp, adn, adl, list) {
9789                 list_del(&adp->list);
9790                 kfree(adp);
9791         }
9792 }
9793
9794 static void nf_tables_commit_audit_collect(struct list_head *adl,
9795                                            struct nft_table *table, u32 op)
9796 {
9797         struct nft_audit_data *adp;
9798
9799         list_for_each_entry(adp, adl, list) {
9800                 if (adp->table == table)
9801                         goto found;
9802         }
9803         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9804         return;
9805 found:
9806         adp->entries++;
9807         if (!adp->op || adp->op > op)
9808                 adp->op = op;
9809 }
9810
9811 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9812
9813 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9814 {
9815         struct nft_audit_data *adp, *adn;
9816         char aubuf[AUNFTABLENAMELEN];
9817
9818         list_for_each_entry_safe(adp, adn, adl, list) {
9819                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9820                          generation);
9821                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9822                                 nft2audit_op[adp->op], GFP_KERNEL);
9823                 list_del(&adp->list);
9824                 kfree(adp);
9825         }
9826 }
9827
9828 static void nft_set_commit_update(struct list_head *set_update_list)
9829 {
9830         struct nft_set *set, *next;
9831
9832         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9833                 list_del_init(&set->pending_update);
9834
9835                 if (!set->ops->commit)
9836                         continue;
9837
9838                 set->ops->commit(set);
9839         }
9840 }
9841
9842 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
9843 {
9844         unsigned int gc_seq;
9845
9846         /* Bump gc counter, it becomes odd, this is the busy mark. */
9847         gc_seq = READ_ONCE(nft_net->gc_seq);
9848         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9849
9850         return gc_seq;
9851 }
9852
9853 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
9854 {
9855         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9856 }
9857
9858 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9859 {
9860         struct nftables_pernet *nft_net = nft_pernet(net);
9861         struct nft_trans *trans, *next;
9862         unsigned int base_seq, gc_seq;
9863         LIST_HEAD(set_update_list);
9864         struct nft_trans_elem *te;
9865         struct nft_chain *chain;
9866         struct nft_table *table;
9867         LIST_HEAD(adl);
9868         int err;
9869
9870         if (list_empty(&nft_net->commit_list)) {
9871                 mutex_unlock(&nft_net->commit_mutex);
9872                 return 0;
9873         }
9874
9875         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9876                 switch (trans->msg_type) {
9877                 case NFT_MSG_NEWSET:
9878                         if (!nft_trans_set_update(trans) &&
9879                             nft_set_is_anonymous(nft_trans_set(trans)) &&
9880                             !nft_trans_set_bound(trans)) {
9881                                 pr_warn_once("nftables ruleset with unbound set\n");
9882                                 return -EINVAL;
9883                         }
9884                         break;
9885                 case NFT_MSG_NEWCHAIN:
9886                         if (!nft_trans_chain_update(trans) &&
9887                             nft_chain_binding(nft_trans_chain(trans)) &&
9888                             !nft_trans_chain_bound(trans)) {
9889                                 pr_warn_once("nftables ruleset with unbound chain\n");
9890                                 return -EINVAL;
9891                         }
9892                         break;
9893                 }
9894         }
9895
9896         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9897         if (nf_tables_validate(net) < 0) {
9898                 nft_net->validate_state = NFT_VALIDATE_DO;
9899                 return -EAGAIN;
9900         }
9901
9902         err = nft_flow_rule_offload_commit(net);
9903         if (err < 0)
9904                 return err;
9905
9906         /* 1.  Allocate space for next generation rules_gen_X[] */
9907         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9908                 int ret;
9909
9910                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9911                 if (ret) {
9912                         nf_tables_commit_chain_prepare_cancel(net);
9913                         nf_tables_commit_audit_free(&adl);
9914                         return ret;
9915                 }
9916                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9917                     trans->msg_type == NFT_MSG_DELRULE) {
9918                         chain = trans->ctx.chain;
9919
9920                         ret = nf_tables_commit_chain_prepare(net, chain);
9921                         if (ret < 0) {
9922                                 nf_tables_commit_chain_prepare_cancel(net);
9923                                 nf_tables_commit_audit_free(&adl);
9924                                 return ret;
9925                         }
9926                 }
9927         }
9928
9929         /* step 2.  Make rules_gen_X visible to packet path */
9930         list_for_each_entry(table, &nft_net->tables, list) {
9931                 list_for_each_entry(chain, &table->chains, list)
9932                         nf_tables_commit_chain(net, chain);
9933         }
9934
9935         /*
9936          * Bump generation counter, invalidate any dump in progress.
9937          * Cannot fail after this point.
9938          */
9939         base_seq = READ_ONCE(nft_net->base_seq);
9940         while (++base_seq == 0)
9941                 ;
9942
9943         WRITE_ONCE(nft_net->base_seq, base_seq);
9944
9945         gc_seq = nft_gc_seq_begin(nft_net);
9946
9947         /* step 3. Start new generation, rules_gen_X now in use. */
9948         net->nft.gencursor = nft_gencursor_next(net);
9949
9950         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9951                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9952                                                trans->msg_type);
9953                 switch (trans->msg_type) {
9954                 case NFT_MSG_NEWTABLE:
9955                         if (nft_trans_table_update(trans)) {
9956                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9957                                         nft_trans_destroy(trans);
9958                                         break;
9959                                 }
9960                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9961                                         nf_tables_table_disable(net, trans->ctx.table);
9962
9963                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9964                         } else {
9965                                 nft_clear(net, trans->ctx.table);
9966                         }
9967                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9968                         nft_trans_destroy(trans);
9969                         break;
9970                 case NFT_MSG_DELTABLE:
9971                 case NFT_MSG_DESTROYTABLE:
9972                         list_del_rcu(&trans->ctx.table->list);
9973                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
9974                         break;
9975                 case NFT_MSG_NEWCHAIN:
9976                         if (nft_trans_chain_update(trans)) {
9977                                 nft_chain_commit_update(trans);
9978                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9979                                                        &nft_trans_chain_hooks(trans));
9980                                 list_splice(&nft_trans_chain_hooks(trans),
9981                                             &nft_trans_basechain(trans)->hook_list);
9982                                 /* trans destroyed after rcu grace period */
9983                         } else {
9984                                 nft_chain_commit_drop_policy(trans);
9985                                 nft_clear(net, trans->ctx.chain);
9986                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9987                                 nft_trans_destroy(trans);
9988                         }
9989                         break;
9990                 case NFT_MSG_DELCHAIN:
9991                 case NFT_MSG_DESTROYCHAIN:
9992                         if (nft_trans_chain_update(trans)) {
9993                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9994                                                        &nft_trans_chain_hooks(trans));
9995                                 nft_netdev_unregister_hooks(net,
9996                                                             &nft_trans_chain_hooks(trans),
9997                                                             true);
9998                         } else {
9999                                 nft_chain_del(trans->ctx.chain);
10000                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10001                                                        NULL);
10002                                 nf_tables_unregister_hook(trans->ctx.net,
10003                                                           trans->ctx.table,
10004                                                           trans->ctx.chain);
10005                         }
10006                         break;
10007                 case NFT_MSG_NEWRULE:
10008                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10009                         nf_tables_rule_notify(&trans->ctx,
10010                                               nft_trans_rule(trans),
10011                                               NFT_MSG_NEWRULE);
10012                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10013                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10014
10015                         nft_trans_destroy(trans);
10016                         break;
10017                 case NFT_MSG_DELRULE:
10018                 case NFT_MSG_DESTROYRULE:
10019                         list_del_rcu(&nft_trans_rule(trans)->list);
10020                         nf_tables_rule_notify(&trans->ctx,
10021                                               nft_trans_rule(trans),
10022                                               trans->msg_type);
10023                         nft_rule_expr_deactivate(&trans->ctx,
10024                                                  nft_trans_rule(trans),
10025                                                  NFT_TRANS_COMMIT);
10026
10027                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10028                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10029                         break;
10030                 case NFT_MSG_NEWSET:
10031                         if (nft_trans_set_update(trans)) {
10032                                 struct nft_set *set = nft_trans_set(trans);
10033
10034                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10035                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10036
10037                                 if (nft_trans_set_size(trans))
10038                                         WRITE_ONCE(set->size, nft_trans_set_size(trans));
10039                         } else {
10040                                 nft_clear(net, nft_trans_set(trans));
10041                                 /* This avoids hitting -EBUSY when deleting the table
10042                                  * from the transaction.
10043                                  */
10044                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10045                                     !list_empty(&nft_trans_set(trans)->bindings))
10046                                         nft_use_dec(&trans->ctx.table->use);
10047                         }
10048                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10049                                              NFT_MSG_NEWSET, GFP_KERNEL);
10050                         nft_trans_destroy(trans);
10051                         break;
10052                 case NFT_MSG_DELSET:
10053                 case NFT_MSG_DESTROYSET:
10054                         nft_trans_set(trans)->dead = 1;
10055                         list_del_rcu(&nft_trans_set(trans)->list);
10056                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10057                                              trans->msg_type, GFP_KERNEL);
10058                         break;
10059                 case NFT_MSG_NEWSETELEM:
10060                         te = (struct nft_trans_elem *)trans->data;
10061
10062                         nft_setelem_activate(net, te->set, &te->elem);
10063                         nf_tables_setelem_notify(&trans->ctx, te->set,
10064                                                  &te->elem,
10065                                                  NFT_MSG_NEWSETELEM);
10066                         if (te->set->ops->commit &&
10067                             list_empty(&te->set->pending_update)) {
10068                                 list_add_tail(&te->set->pending_update,
10069                                               &set_update_list);
10070                         }
10071                         nft_trans_destroy(trans);
10072                         break;
10073                 case NFT_MSG_DELSETELEM:
10074                 case NFT_MSG_DESTROYSETELEM:
10075                         te = (struct nft_trans_elem *)trans->data;
10076
10077                         nf_tables_setelem_notify(&trans->ctx, te->set,
10078                                                  &te->elem,
10079                                                  trans->msg_type);
10080                         nft_setelem_remove(net, te->set, &te->elem);
10081                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
10082                                 atomic_dec(&te->set->nelems);
10083                                 te->set->ndeact--;
10084                         }
10085                         if (te->set->ops->commit &&
10086                             list_empty(&te->set->pending_update)) {
10087                                 list_add_tail(&te->set->pending_update,
10088                                               &set_update_list);
10089                         }
10090                         break;
10091                 case NFT_MSG_NEWOBJ:
10092                         if (nft_trans_obj_update(trans)) {
10093                                 nft_obj_commit_update(trans);
10094                                 nf_tables_obj_notify(&trans->ctx,
10095                                                      nft_trans_obj(trans),
10096                                                      NFT_MSG_NEWOBJ);
10097                         } else {
10098                                 nft_clear(net, nft_trans_obj(trans));
10099                                 nf_tables_obj_notify(&trans->ctx,
10100                                                      nft_trans_obj(trans),
10101                                                      NFT_MSG_NEWOBJ);
10102                                 nft_trans_destroy(trans);
10103                         }
10104                         break;
10105                 case NFT_MSG_DELOBJ:
10106                 case NFT_MSG_DESTROYOBJ:
10107                         nft_obj_del(nft_trans_obj(trans));
10108                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10109                                              trans->msg_type);
10110                         break;
10111                 case NFT_MSG_NEWFLOWTABLE:
10112                         if (nft_trans_flowtable_update(trans)) {
10113                                 nft_trans_flowtable(trans)->data.flags =
10114                                         nft_trans_flowtable_flags(trans);
10115                                 nf_tables_flowtable_notify(&trans->ctx,
10116                                                            nft_trans_flowtable(trans),
10117                                                            &nft_trans_flowtable_hooks(trans),
10118                                                            NFT_MSG_NEWFLOWTABLE);
10119                                 list_splice(&nft_trans_flowtable_hooks(trans),
10120                                             &nft_trans_flowtable(trans)->hook_list);
10121                         } else {
10122                                 nft_clear(net, nft_trans_flowtable(trans));
10123                                 nf_tables_flowtable_notify(&trans->ctx,
10124                                                            nft_trans_flowtable(trans),
10125                                                            NULL,
10126                                                            NFT_MSG_NEWFLOWTABLE);
10127                         }
10128                         nft_trans_destroy(trans);
10129                         break;
10130                 case NFT_MSG_DELFLOWTABLE:
10131                 case NFT_MSG_DESTROYFLOWTABLE:
10132                         if (nft_trans_flowtable_update(trans)) {
10133                                 nf_tables_flowtable_notify(&trans->ctx,
10134                                                            nft_trans_flowtable(trans),
10135                                                            &nft_trans_flowtable_hooks(trans),
10136                                                            trans->msg_type);
10137                                 nft_unregister_flowtable_net_hooks(net,
10138                                                                    &nft_trans_flowtable_hooks(trans));
10139                         } else {
10140                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10141                                 nf_tables_flowtable_notify(&trans->ctx,
10142                                                            nft_trans_flowtable(trans),
10143                                                            NULL,
10144                                                            trans->msg_type);
10145                                 nft_unregister_flowtable_net_hooks(net,
10146                                                 &nft_trans_flowtable(trans)->hook_list);
10147                         }
10148                         break;
10149                 }
10150         }
10151
10152         nft_set_commit_update(&set_update_list);
10153
10154         nft_commit_notify(net, NETLINK_CB(skb).portid);
10155         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10156         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10157
10158         nft_gc_seq_end(nft_net, gc_seq);
10159         nft_net->validate_state = NFT_VALIDATE_SKIP;
10160         nf_tables_commit_release(net);
10161
10162         return 0;
10163 }
10164
10165 static void nf_tables_module_autoload(struct net *net)
10166 {
10167         struct nftables_pernet *nft_net = nft_pernet(net);
10168         struct nft_module_request *req, *next;
10169         LIST_HEAD(module_list);
10170
10171         list_splice_init(&nft_net->module_list, &module_list);
10172         mutex_unlock(&nft_net->commit_mutex);
10173         list_for_each_entry_safe(req, next, &module_list, list) {
10174                 request_module("%s", req->module);
10175                 req->done = true;
10176         }
10177         mutex_lock(&nft_net->commit_mutex);
10178         list_splice(&module_list, &nft_net->module_list);
10179 }
10180
10181 static void nf_tables_abort_release(struct nft_trans *trans)
10182 {
10183         switch (trans->msg_type) {
10184         case NFT_MSG_NEWTABLE:
10185                 nf_tables_table_destroy(&trans->ctx);
10186                 break;
10187         case NFT_MSG_NEWCHAIN:
10188                 if (nft_trans_chain_update(trans))
10189                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10190                 else
10191                         nf_tables_chain_destroy(&trans->ctx);
10192                 break;
10193         case NFT_MSG_NEWRULE:
10194                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10195                 break;
10196         case NFT_MSG_NEWSET:
10197                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10198                 break;
10199         case NFT_MSG_NEWSETELEM:
10200                 nft_set_elem_destroy(nft_trans_elem_set(trans),
10201                                      nft_trans_elem(trans).priv, true);
10202                 break;
10203         case NFT_MSG_NEWOBJ:
10204                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10205                 break;
10206         case NFT_MSG_NEWFLOWTABLE:
10207                 if (nft_trans_flowtable_update(trans))
10208                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10209                 else
10210                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10211                 break;
10212         }
10213         kfree(trans);
10214 }
10215
10216 static void nft_set_abort_update(struct list_head *set_update_list)
10217 {
10218         struct nft_set *set, *next;
10219
10220         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10221                 list_del_init(&set->pending_update);
10222
10223                 if (!set->ops->abort)
10224                         continue;
10225
10226                 set->ops->abort(set);
10227         }
10228 }
10229
10230 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10231 {
10232         struct nftables_pernet *nft_net = nft_pernet(net);
10233         struct nft_trans *trans, *next;
10234         LIST_HEAD(set_update_list);
10235         struct nft_trans_elem *te;
10236
10237         if (action == NFNL_ABORT_VALIDATE &&
10238             nf_tables_validate(net) < 0)
10239                 return -EAGAIN;
10240
10241         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10242                                          list) {
10243                 switch (trans->msg_type) {
10244                 case NFT_MSG_NEWTABLE:
10245                         if (nft_trans_table_update(trans)) {
10246                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10247                                         nft_trans_destroy(trans);
10248                                         break;
10249                                 }
10250                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10251                                         nf_tables_table_disable(net, trans->ctx.table);
10252                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10253                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10254                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10255                                 }
10256                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10257                                 nft_trans_destroy(trans);
10258                         } else {
10259                                 list_del_rcu(&trans->ctx.table->list);
10260                         }
10261                         break;
10262                 case NFT_MSG_DELTABLE:
10263                 case NFT_MSG_DESTROYTABLE:
10264                         nft_clear(trans->ctx.net, trans->ctx.table);
10265                         nft_trans_destroy(trans);
10266                         break;
10267                 case NFT_MSG_NEWCHAIN:
10268                         if (nft_trans_chain_update(trans)) {
10269                                 nft_netdev_unregister_hooks(net,
10270                                                             &nft_trans_chain_hooks(trans),
10271                                                             true);
10272                                 free_percpu(nft_trans_chain_stats(trans));
10273                                 kfree(nft_trans_chain_name(trans));
10274                                 nft_trans_destroy(trans);
10275                         } else {
10276                                 if (nft_trans_chain_bound(trans)) {
10277                                         nft_trans_destroy(trans);
10278                                         break;
10279                                 }
10280                                 nft_use_dec_restore(&trans->ctx.table->use);
10281                                 nft_chain_del(trans->ctx.chain);
10282                                 nf_tables_unregister_hook(trans->ctx.net,
10283                                                           trans->ctx.table,
10284                                                           trans->ctx.chain);
10285                         }
10286                         break;
10287                 case NFT_MSG_DELCHAIN:
10288                 case NFT_MSG_DESTROYCHAIN:
10289                         if (nft_trans_chain_update(trans)) {
10290                                 list_splice(&nft_trans_chain_hooks(trans),
10291                                             &nft_trans_basechain(trans)->hook_list);
10292                         } else {
10293                                 nft_use_inc_restore(&trans->ctx.table->use);
10294                                 nft_clear(trans->ctx.net, trans->ctx.chain);
10295                         }
10296                         nft_trans_destroy(trans);
10297                         break;
10298                 case NFT_MSG_NEWRULE:
10299                         if (nft_trans_rule_bound(trans)) {
10300                                 nft_trans_destroy(trans);
10301                                 break;
10302                         }
10303                         nft_use_dec_restore(&trans->ctx.chain->use);
10304                         list_del_rcu(&nft_trans_rule(trans)->list);
10305                         nft_rule_expr_deactivate(&trans->ctx,
10306                                                  nft_trans_rule(trans),
10307                                                  NFT_TRANS_ABORT);
10308                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10309                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10310                         break;
10311                 case NFT_MSG_DELRULE:
10312                 case NFT_MSG_DESTROYRULE:
10313                         nft_use_inc_restore(&trans->ctx.chain->use);
10314                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10315                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10316                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10317                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10318
10319                         nft_trans_destroy(trans);
10320                         break;
10321                 case NFT_MSG_NEWSET:
10322                         if (nft_trans_set_update(trans)) {
10323                                 nft_trans_destroy(trans);
10324                                 break;
10325                         }
10326                         nft_use_dec_restore(&trans->ctx.table->use);
10327                         if (nft_trans_set_bound(trans)) {
10328                                 nft_trans_destroy(trans);
10329                                 break;
10330                         }
10331                         list_del_rcu(&nft_trans_set(trans)->list);
10332                         break;
10333                 case NFT_MSG_DELSET:
10334                 case NFT_MSG_DESTROYSET:
10335                         nft_use_inc_restore(&trans->ctx.table->use);
10336                         nft_clear(trans->ctx.net, nft_trans_set(trans));
10337                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10338                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10339
10340                         nft_trans_destroy(trans);
10341                         break;
10342                 case NFT_MSG_NEWSETELEM:
10343                         if (nft_trans_elem_set_bound(trans)) {
10344                                 nft_trans_destroy(trans);
10345                                 break;
10346                         }
10347                         te = (struct nft_trans_elem *)trans->data;
10348                         nft_setelem_remove(net, te->set, &te->elem);
10349                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10350                                 atomic_dec(&te->set->nelems);
10351
10352                         if (te->set->ops->abort &&
10353                             list_empty(&te->set->pending_update)) {
10354                                 list_add_tail(&te->set->pending_update,
10355                                               &set_update_list);
10356                         }
10357                         break;
10358                 case NFT_MSG_DELSETELEM:
10359                 case NFT_MSG_DESTROYSETELEM:
10360                         te = (struct nft_trans_elem *)trans->data;
10361
10362                         nft_setelem_data_activate(net, te->set, &te->elem);
10363                         nft_setelem_activate(net, te->set, &te->elem);
10364                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10365                                 te->set->ndeact--;
10366
10367                         if (te->set->ops->abort &&
10368                             list_empty(&te->set->pending_update)) {
10369                                 list_add_tail(&te->set->pending_update,
10370                                               &set_update_list);
10371                         }
10372                         nft_trans_destroy(trans);
10373                         break;
10374                 case NFT_MSG_NEWOBJ:
10375                         if (nft_trans_obj_update(trans)) {
10376                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10377                                 nft_trans_destroy(trans);
10378                         } else {
10379                                 nft_use_dec_restore(&trans->ctx.table->use);
10380                                 nft_obj_del(nft_trans_obj(trans));
10381                         }
10382                         break;
10383                 case NFT_MSG_DELOBJ:
10384                 case NFT_MSG_DESTROYOBJ:
10385                         nft_use_inc_restore(&trans->ctx.table->use);
10386                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
10387                         nft_trans_destroy(trans);
10388                         break;
10389                 case NFT_MSG_NEWFLOWTABLE:
10390                         if (nft_trans_flowtable_update(trans)) {
10391                                 nft_unregister_flowtable_net_hooks(net,
10392                                                 &nft_trans_flowtable_hooks(trans));
10393                         } else {
10394                                 nft_use_dec_restore(&trans->ctx.table->use);
10395                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10396                                 nft_unregister_flowtable_net_hooks(net,
10397                                                 &nft_trans_flowtable(trans)->hook_list);
10398                         }
10399                         break;
10400                 case NFT_MSG_DELFLOWTABLE:
10401                 case NFT_MSG_DESTROYFLOWTABLE:
10402                         if (nft_trans_flowtable_update(trans)) {
10403                                 list_splice(&nft_trans_flowtable_hooks(trans),
10404                                             &nft_trans_flowtable(trans)->hook_list);
10405                         } else {
10406                                 nft_use_inc_restore(&trans->ctx.table->use);
10407                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10408                         }
10409                         nft_trans_destroy(trans);
10410                         break;
10411                 }
10412         }
10413
10414         nft_set_abort_update(&set_update_list);
10415
10416         synchronize_rcu();
10417
10418         list_for_each_entry_safe_reverse(trans, next,
10419                                          &nft_net->commit_list, list) {
10420                 nft_trans_list_del(trans);
10421                 nf_tables_abort_release(trans);
10422         }
10423
10424         if (action == NFNL_ABORT_AUTOLOAD)
10425                 nf_tables_module_autoload(net);
10426         else
10427                 nf_tables_module_autoload_cleanup(net);
10428
10429         return 0;
10430 }
10431
10432 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10433                            enum nfnl_abort_action action)
10434 {
10435         struct nftables_pernet *nft_net = nft_pernet(net);
10436         unsigned int gc_seq;
10437         int ret;
10438
10439         gc_seq = nft_gc_seq_begin(nft_net);
10440         ret = __nf_tables_abort(net, action);
10441         nft_gc_seq_end(nft_net, gc_seq);
10442         mutex_unlock(&nft_net->commit_mutex);
10443
10444         return ret;
10445 }
10446
10447 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10448 {
10449         struct nftables_pernet *nft_net = nft_pernet(net);
10450         bool genid_ok;
10451
10452         mutex_lock(&nft_net->commit_mutex);
10453
10454         genid_ok = genid == 0 || nft_net->base_seq == genid;
10455         if (!genid_ok)
10456                 mutex_unlock(&nft_net->commit_mutex);
10457
10458         /* else, commit mutex has to be released by commit or abort function */
10459         return genid_ok;
10460 }
10461
10462 static const struct nfnetlink_subsystem nf_tables_subsys = {
10463         .name           = "nf_tables",
10464         .subsys_id      = NFNL_SUBSYS_NFTABLES,
10465         .cb_count       = NFT_MSG_MAX,
10466         .cb             = nf_tables_cb,
10467         .commit         = nf_tables_commit,
10468         .abort          = nf_tables_abort,
10469         .valid_genid    = nf_tables_valid_genid,
10470         .owner          = THIS_MODULE,
10471 };
10472
10473 int nft_chain_validate_dependency(const struct nft_chain *chain,
10474                                   enum nft_chain_types type)
10475 {
10476         const struct nft_base_chain *basechain;
10477
10478         if (nft_is_base_chain(chain)) {
10479                 basechain = nft_base_chain(chain);
10480                 if (basechain->type->type != type)
10481                         return -EOPNOTSUPP;
10482         }
10483         return 0;
10484 }
10485 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10486
10487 int nft_chain_validate_hooks(const struct nft_chain *chain,
10488                              unsigned int hook_flags)
10489 {
10490         struct nft_base_chain *basechain;
10491
10492         if (nft_is_base_chain(chain)) {
10493                 basechain = nft_base_chain(chain);
10494
10495                 if ((1 << basechain->ops.hooknum) & hook_flags)
10496                         return 0;
10497
10498                 return -EOPNOTSUPP;
10499         }
10500
10501         return 0;
10502 }
10503 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10504
10505 /*
10506  * Loop detection - walk through the ruleset beginning at the destination chain
10507  * of a new jump until either the source chain is reached (loop) or all
10508  * reachable chains have been traversed.
10509  *
10510  * The loop check is performed whenever a new jump verdict is added to an
10511  * expression or verdict map or a verdict map is bound to a new chain.
10512  */
10513
10514 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10515                                  const struct nft_chain *chain);
10516
10517 static int nft_check_loops(const struct nft_ctx *ctx,
10518                            const struct nft_set_ext *ext)
10519 {
10520         const struct nft_data *data;
10521         int ret;
10522
10523         data = nft_set_ext_data(ext);
10524         switch (data->verdict.code) {
10525         case NFT_JUMP:
10526         case NFT_GOTO:
10527                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10528                 break;
10529         default:
10530                 ret = 0;
10531                 break;
10532         }
10533
10534         return ret;
10535 }
10536
10537 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10538                                         struct nft_set *set,
10539                                         const struct nft_set_iter *iter,
10540                                         struct nft_set_elem *elem)
10541 {
10542         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10543
10544         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10545             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10546                 return 0;
10547
10548         return nft_check_loops(ctx, ext);
10549 }
10550
10551 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10552                                   struct nft_set *set)
10553 {
10554         u8 genmask = nft_genmask_next(ctx->net);
10555         struct nft_set_elem_catchall *catchall;
10556         struct nft_set_ext *ext;
10557         int ret = 0;
10558
10559         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10560                 ext = nft_set_elem_ext(set, catchall->elem);
10561                 if (!nft_set_elem_active(ext, genmask))
10562                         continue;
10563
10564                 ret = nft_check_loops(ctx, ext);
10565                 if (ret < 0)
10566                         return ret;
10567         }
10568
10569         return ret;
10570 }
10571
10572 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10573                                  const struct nft_chain *chain)
10574 {
10575         const struct nft_rule *rule;
10576         const struct nft_expr *expr, *last;
10577         struct nft_set *set;
10578         struct nft_set_binding *binding;
10579         struct nft_set_iter iter;
10580
10581         if (ctx->chain == chain)
10582                 return -ELOOP;
10583
10584         if (fatal_signal_pending(current))
10585                 return -EINTR;
10586
10587         list_for_each_entry(rule, &chain->rules, list) {
10588                 nft_rule_for_each_expr(expr, last, rule) {
10589                         struct nft_immediate_expr *priv;
10590                         const struct nft_data *data;
10591                         int err;
10592
10593                         if (strcmp(expr->ops->type->name, "immediate"))
10594                                 continue;
10595
10596                         priv = nft_expr_priv(expr);
10597                         if (priv->dreg != NFT_REG_VERDICT)
10598                                 continue;
10599
10600                         data = &priv->data;
10601                         switch (data->verdict.code) {
10602                         case NFT_JUMP:
10603                         case NFT_GOTO:
10604                                 err = nf_tables_check_loops(ctx,
10605                                                         data->verdict.chain);
10606                                 if (err < 0)
10607                                         return err;
10608                                 break;
10609                         default:
10610                                 break;
10611                         }
10612                 }
10613         }
10614
10615         list_for_each_entry(set, &ctx->table->sets, list) {
10616                 if (!nft_is_active_next(ctx->net, set))
10617                         continue;
10618                 if (!(set->flags & NFT_SET_MAP) ||
10619                     set->dtype != NFT_DATA_VERDICT)
10620                         continue;
10621
10622                 list_for_each_entry(binding, &set->bindings, list) {
10623                         if (!(binding->flags & NFT_SET_MAP) ||
10624                             binding->chain != chain)
10625                                 continue;
10626
10627                         iter.genmask    = nft_genmask_next(ctx->net);
10628                         iter.skip       = 0;
10629                         iter.count      = 0;
10630                         iter.err        = 0;
10631                         iter.fn         = nf_tables_loop_check_setelem;
10632
10633                         set->ops->walk(ctx, set, &iter);
10634                         if (!iter.err)
10635                                 iter.err = nft_set_catchall_loops(ctx, set);
10636
10637                         if (iter.err < 0)
10638                                 return iter.err;
10639                 }
10640         }
10641
10642         return 0;
10643 }
10644
10645 /**
10646  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
10647  *
10648  *      @attr: netlink attribute to fetch value from
10649  *      @max: maximum value to be stored in dest
10650  *      @dest: pointer to the variable
10651  *
10652  *      Parse, check and store a given u32 netlink attribute into variable.
10653  *      This function returns -ERANGE if the value goes over maximum value.
10654  *      Otherwise a 0 is returned and the attribute value is stored in the
10655  *      destination variable.
10656  */
10657 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10658 {
10659         u32 val;
10660
10661         val = ntohl(nla_get_be32(attr));
10662         if (val > max)
10663                 return -ERANGE;
10664
10665         *dest = val;
10666         return 0;
10667 }
10668 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10669
10670 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10671 {
10672         unsigned int reg;
10673
10674         reg = ntohl(nla_get_be32(attr));
10675         switch (reg) {
10676         case NFT_REG_VERDICT...NFT_REG_4:
10677                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10678                 break;
10679         case NFT_REG32_00...NFT_REG32_15:
10680                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10681                 break;
10682         default:
10683                 return -ERANGE;
10684         }
10685
10686         return 0;
10687 }
10688
10689 /**
10690  *      nft_dump_register - dump a register value to a netlink attribute
10691  *
10692  *      @skb: socket buffer
10693  *      @attr: attribute number
10694  *      @reg: register number
10695  *
10696  *      Construct a netlink attribute containing the register number. For
10697  *      compatibility reasons, register numbers being a multiple of 4 are
10698  *      translated to the corresponding 128 bit register numbers.
10699  */
10700 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10701 {
10702         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10703                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10704         else
10705                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10706
10707         return nla_put_be32(skb, attr, htonl(reg));
10708 }
10709 EXPORT_SYMBOL_GPL(nft_dump_register);
10710
10711 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10712 {
10713         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10714                 return -EINVAL;
10715         if (len == 0)
10716                 return -EINVAL;
10717         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10718                 return -ERANGE;
10719
10720         return 0;
10721 }
10722
10723 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10724 {
10725         u32 reg;
10726         int err;
10727
10728         err = nft_parse_register(attr, &reg);
10729         if (err < 0)
10730                 return err;
10731
10732         err = nft_validate_register_load(reg, len);
10733         if (err < 0)
10734                 return err;
10735
10736         *sreg = reg;
10737         return 0;
10738 }
10739 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10740
10741 static int nft_validate_register_store(const struct nft_ctx *ctx,
10742                                        enum nft_registers reg,
10743                                        const struct nft_data *data,
10744                                        enum nft_data_types type,
10745                                        unsigned int len)
10746 {
10747         int err;
10748
10749         switch (reg) {
10750         case NFT_REG_VERDICT:
10751                 if (type != NFT_DATA_VERDICT)
10752                         return -EINVAL;
10753
10754                 if (data != NULL &&
10755                     (data->verdict.code == NFT_GOTO ||
10756                      data->verdict.code == NFT_JUMP)) {
10757                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10758                         if (err < 0)
10759                                 return err;
10760                 }
10761
10762                 return 0;
10763         default:
10764                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10765                         return -EINVAL;
10766                 if (len == 0)
10767                         return -EINVAL;
10768                 if (reg * NFT_REG32_SIZE + len >
10769                     sizeof_field(struct nft_regs, data))
10770                         return -ERANGE;
10771
10772                 if (data != NULL && type != NFT_DATA_VALUE)
10773                         return -EINVAL;
10774                 return 0;
10775         }
10776 }
10777
10778 int nft_parse_register_store(const struct nft_ctx *ctx,
10779                              const struct nlattr *attr, u8 *dreg,
10780                              const struct nft_data *data,
10781                              enum nft_data_types type, unsigned int len)
10782 {
10783         int err;
10784         u32 reg;
10785
10786         err = nft_parse_register(attr, &reg);
10787         if (err < 0)
10788                 return err;
10789
10790         err = nft_validate_register_store(ctx, reg, data, type, len);
10791         if (err < 0)
10792                 return err;
10793
10794         *dreg = reg;
10795         return 0;
10796 }
10797 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10798
10799 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10800         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10801         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10802                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10803         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10804 };
10805
10806 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10807                             struct nft_data_desc *desc, const struct nlattr *nla)
10808 {
10809         u8 genmask = nft_genmask_next(ctx->net);
10810         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10811         struct nft_chain *chain;
10812         int err;
10813
10814         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10815                                           nft_verdict_policy, NULL);
10816         if (err < 0)
10817                 return err;
10818
10819         if (!tb[NFTA_VERDICT_CODE])
10820                 return -EINVAL;
10821
10822         /* zero padding hole for memcmp */
10823         memset(data, 0, sizeof(*data));
10824         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10825
10826         switch (data->verdict.code) {
10827         default:
10828                 switch (data->verdict.code & NF_VERDICT_MASK) {
10829                 case NF_ACCEPT:
10830                 case NF_DROP:
10831                 case NF_QUEUE:
10832                         break;
10833                 default:
10834                         return -EINVAL;
10835                 }
10836                 fallthrough;
10837         case NFT_CONTINUE:
10838         case NFT_BREAK:
10839         case NFT_RETURN:
10840                 break;
10841         case NFT_JUMP:
10842         case NFT_GOTO:
10843                 if (tb[NFTA_VERDICT_CHAIN]) {
10844                         chain = nft_chain_lookup(ctx->net, ctx->table,
10845                                                  tb[NFTA_VERDICT_CHAIN],
10846                                                  genmask);
10847                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10848                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10849                                                       tb[NFTA_VERDICT_CHAIN_ID],
10850                                                       genmask);
10851                         if (IS_ERR(chain))
10852                                 return PTR_ERR(chain);
10853                 } else {
10854                         return -EINVAL;
10855                 }
10856
10857                 if (IS_ERR(chain))
10858                         return PTR_ERR(chain);
10859                 if (nft_is_base_chain(chain))
10860                         return -EOPNOTSUPP;
10861                 if (nft_chain_is_bound(chain))
10862                         return -EINVAL;
10863                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10864                     chain->flags & NFT_CHAIN_BINDING)
10865                         return -EINVAL;
10866                 if (!nft_use_inc(&chain->use))
10867                         return -EMFILE;
10868
10869                 data->verdict.chain = chain;
10870                 break;
10871         }
10872
10873         desc->len = sizeof(data->verdict);
10874
10875         return 0;
10876 }
10877
10878 static void nft_verdict_uninit(const struct nft_data *data)
10879 {
10880         struct nft_chain *chain;
10881
10882         switch (data->verdict.code) {
10883         case NFT_JUMP:
10884         case NFT_GOTO:
10885                 chain = data->verdict.chain;
10886                 nft_use_dec(&chain->use);
10887                 break;
10888         }
10889 }
10890
10891 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10892 {
10893         struct nlattr *nest;
10894
10895         nest = nla_nest_start_noflag(skb, type);
10896         if (!nest)
10897                 goto nla_put_failure;
10898
10899         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10900                 goto nla_put_failure;
10901
10902         switch (v->code) {
10903         case NFT_JUMP:
10904         case NFT_GOTO:
10905                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10906                                    v->chain->name))
10907                         goto nla_put_failure;
10908         }
10909         nla_nest_end(skb, nest);
10910         return 0;
10911
10912 nla_put_failure:
10913         return -1;
10914 }
10915
10916 static int nft_value_init(const struct nft_ctx *ctx,
10917                           struct nft_data *data, struct nft_data_desc *desc,
10918                           const struct nlattr *nla)
10919 {
10920         unsigned int len;
10921
10922         len = nla_len(nla);
10923         if (len == 0)
10924                 return -EINVAL;
10925         if (len > desc->size)
10926                 return -EOVERFLOW;
10927         if (desc->len) {
10928                 if (len != desc->len)
10929                         return -EINVAL;
10930         } else {
10931                 desc->len = len;
10932         }
10933
10934         nla_memcpy(data->data, nla, len);
10935
10936         return 0;
10937 }
10938
10939 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10940                           unsigned int len)
10941 {
10942         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10943 }
10944
10945 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10946         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10947         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10948 };
10949
10950 /**
10951  *      nft_data_init - parse nf_tables data netlink attributes
10952  *
10953  *      @ctx: context of the expression using the data
10954  *      @data: destination struct nft_data
10955  *      @desc: data description
10956  *      @nla: netlink attribute containing data
10957  *
10958  *      Parse the netlink data attributes and initialize a struct nft_data.
10959  *      The type and length of data are returned in the data description.
10960  *
10961  *      The caller can indicate that it only wants to accept data of type
10962  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10963  */
10964 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10965                   struct nft_data_desc *desc, const struct nlattr *nla)
10966 {
10967         struct nlattr *tb[NFTA_DATA_MAX + 1];
10968         int err;
10969
10970         if (WARN_ON_ONCE(!desc->size))
10971                 return -EINVAL;
10972
10973         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10974                                           nft_data_policy, NULL);
10975         if (err < 0)
10976                 return err;
10977
10978         if (tb[NFTA_DATA_VALUE]) {
10979                 if (desc->type != NFT_DATA_VALUE)
10980                         return -EINVAL;
10981
10982                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10983         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10984                 if (desc->type != NFT_DATA_VERDICT)
10985                         return -EINVAL;
10986
10987                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10988         } else {
10989                 err = -EINVAL;
10990         }
10991
10992         return err;
10993 }
10994 EXPORT_SYMBOL_GPL(nft_data_init);
10995
10996 /**
10997  *      nft_data_release - release a nft_data item
10998  *
10999  *      @data: struct nft_data to release
11000  *      @type: type of data
11001  *
11002  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11003  *      all others need to be released by calling this function.
11004  */
11005 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11006 {
11007         if (type < NFT_DATA_VERDICT)
11008                 return;
11009         switch (type) {
11010         case NFT_DATA_VERDICT:
11011                 return nft_verdict_uninit(data);
11012         default:
11013                 WARN_ON(1);
11014         }
11015 }
11016 EXPORT_SYMBOL_GPL(nft_data_release);
11017
11018 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11019                   enum nft_data_types type, unsigned int len)
11020 {
11021         struct nlattr *nest;
11022         int err;
11023
11024         nest = nla_nest_start_noflag(skb, attr);
11025         if (nest == NULL)
11026                 return -1;
11027
11028         switch (type) {
11029         case NFT_DATA_VALUE:
11030                 err = nft_value_dump(skb, data, len);
11031                 break;
11032         case NFT_DATA_VERDICT:
11033                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11034                 break;
11035         default:
11036                 err = -EINVAL;
11037                 WARN_ON(1);
11038         }
11039
11040         nla_nest_end(skb, nest);
11041         return err;
11042 }
11043 EXPORT_SYMBOL_GPL(nft_data_dump);
11044
11045 int __nft_release_basechain(struct nft_ctx *ctx)
11046 {
11047         struct nft_rule *rule, *nr;
11048
11049         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11050                 return 0;
11051
11052         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11053         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11054                 list_del(&rule->list);
11055                 nft_use_dec(&ctx->chain->use);
11056                 nf_tables_rule_release(ctx, rule);
11057         }
11058         nft_chain_del(ctx->chain);
11059         nft_use_dec(&ctx->table->use);
11060         nf_tables_chain_destroy(ctx);
11061
11062         return 0;
11063 }
11064 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11065
11066 static void __nft_release_hook(struct net *net, struct nft_table *table)
11067 {
11068         struct nft_flowtable *flowtable;
11069         struct nft_chain *chain;
11070
11071         list_for_each_entry(chain, &table->chains, list)
11072                 __nf_tables_unregister_hook(net, table, chain, true);
11073         list_for_each_entry(flowtable, &table->flowtables, list)
11074                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11075                                                      true);
11076 }
11077
11078 static void __nft_release_hooks(struct net *net)
11079 {
11080         struct nftables_pernet *nft_net = nft_pernet(net);
11081         struct nft_table *table;
11082
11083         list_for_each_entry(table, &nft_net->tables, list) {
11084                 if (nft_table_has_owner(table))
11085                         continue;
11086
11087                 __nft_release_hook(net, table);
11088         }
11089 }
11090
11091 static void __nft_release_table(struct net *net, struct nft_table *table)
11092 {
11093         struct nft_flowtable *flowtable, *nf;
11094         struct nft_chain *chain, *nc;
11095         struct nft_object *obj, *ne;
11096         struct nft_rule *rule, *nr;
11097         struct nft_set *set, *ns;
11098         struct nft_ctx ctx = {
11099                 .net    = net,
11100                 .family = NFPROTO_NETDEV,
11101         };
11102
11103         ctx.family = table->family;
11104         ctx.table = table;
11105         list_for_each_entry(chain, &table->chains, list) {
11106                 if (nft_chain_binding(chain))
11107                         continue;
11108
11109                 ctx.chain = chain;
11110                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11111                         list_del(&rule->list);
11112                         nft_use_dec(&chain->use);
11113                         nf_tables_rule_release(&ctx, rule);
11114                 }
11115         }
11116         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11117                 list_del(&flowtable->list);
11118                 nft_use_dec(&table->use);
11119                 nf_tables_flowtable_destroy(flowtable);
11120         }
11121         list_for_each_entry_safe(set, ns, &table->sets, list) {
11122                 list_del(&set->list);
11123                 nft_use_dec(&table->use);
11124                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11125                         nft_map_deactivate(&ctx, set);
11126
11127                 nft_set_destroy(&ctx, set);
11128         }
11129         list_for_each_entry_safe(obj, ne, &table->objects, list) {
11130                 nft_obj_del(obj);
11131                 nft_use_dec(&table->use);
11132                 nft_obj_destroy(&ctx, obj);
11133         }
11134         list_for_each_entry_safe(chain, nc, &table->chains, list) {
11135                 ctx.chain = chain;
11136                 nft_chain_del(chain);
11137                 nft_use_dec(&table->use);
11138                 nf_tables_chain_destroy(&ctx);
11139         }
11140         nf_tables_table_destroy(&ctx);
11141 }
11142
11143 static void __nft_release_tables(struct net *net)
11144 {
11145         struct nftables_pernet *nft_net = nft_pernet(net);
11146         struct nft_table *table, *nt;
11147
11148         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11149                 if (nft_table_has_owner(table))
11150                         continue;
11151
11152                 list_del(&table->list);
11153
11154                 __nft_release_table(net, table);
11155         }
11156 }
11157
11158 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11159                             void *ptr)
11160 {
11161         struct nft_table *table, *to_delete[8];
11162         struct nftables_pernet *nft_net;
11163         struct netlink_notify *n = ptr;
11164         struct net *net = n->net;
11165         unsigned int deleted;
11166         bool restart = false;
11167         unsigned int gc_seq;
11168
11169         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11170                 return NOTIFY_DONE;
11171
11172         nft_net = nft_pernet(net);
11173         deleted = 0;
11174         mutex_lock(&nft_net->commit_mutex);
11175
11176         gc_seq = nft_gc_seq_begin(nft_net);
11177
11178         if (!list_empty(&nf_tables_destroy_list))
11179                 nf_tables_trans_destroy_flush_work();
11180 again:
11181         list_for_each_entry(table, &nft_net->tables, list) {
11182                 if (nft_table_has_owner(table) &&
11183                     n->portid == table->nlpid) {
11184                         __nft_release_hook(net, table);
11185                         list_del_rcu(&table->list);
11186                         to_delete[deleted++] = table;
11187                         if (deleted >= ARRAY_SIZE(to_delete))
11188                                 break;
11189                 }
11190         }
11191         if (deleted) {
11192                 restart = deleted >= ARRAY_SIZE(to_delete);
11193                 synchronize_rcu();
11194                 while (deleted)
11195                         __nft_release_table(net, to_delete[--deleted]);
11196
11197                 if (restart)
11198                         goto again;
11199         }
11200         nft_gc_seq_end(nft_net, gc_seq);
11201
11202         mutex_unlock(&nft_net->commit_mutex);
11203
11204         return NOTIFY_DONE;
11205 }
11206
11207 static struct notifier_block nft_nl_notifier = {
11208         .notifier_call  = nft_rcv_nl_event,
11209 };
11210
11211 static int __net_init nf_tables_init_net(struct net *net)
11212 {
11213         struct nftables_pernet *nft_net = nft_pernet(net);
11214
11215         INIT_LIST_HEAD(&nft_net->tables);
11216         INIT_LIST_HEAD(&nft_net->commit_list);
11217         INIT_LIST_HEAD(&nft_net->binding_list);
11218         INIT_LIST_HEAD(&nft_net->module_list);
11219         INIT_LIST_HEAD(&nft_net->notify_list);
11220         mutex_init(&nft_net->commit_mutex);
11221         nft_net->base_seq = 1;
11222         nft_net->gc_seq = 0;
11223         nft_net->validate_state = NFT_VALIDATE_SKIP;
11224
11225         return 0;
11226 }
11227
11228 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11229 {
11230         struct nftables_pernet *nft_net = nft_pernet(net);
11231
11232         mutex_lock(&nft_net->commit_mutex);
11233         __nft_release_hooks(net);
11234         mutex_unlock(&nft_net->commit_mutex);
11235 }
11236
11237 static void __net_exit nf_tables_exit_net(struct net *net)
11238 {
11239         struct nftables_pernet *nft_net = nft_pernet(net);
11240         unsigned int gc_seq;
11241
11242         mutex_lock(&nft_net->commit_mutex);
11243
11244         gc_seq = nft_gc_seq_begin(nft_net);
11245
11246         if (!list_empty(&nft_net->commit_list) ||
11247             !list_empty(&nft_net->module_list))
11248                 __nf_tables_abort(net, NFNL_ABORT_NONE);
11249
11250         __nft_release_tables(net);
11251
11252         nft_gc_seq_end(nft_net, gc_seq);
11253
11254         mutex_unlock(&nft_net->commit_mutex);
11255         WARN_ON_ONCE(!list_empty(&nft_net->tables));
11256         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11257         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11258 }
11259
11260 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11261 {
11262         flush_work(&trans_gc_work);
11263 }
11264
11265 static struct pernet_operations nf_tables_net_ops = {
11266         .init           = nf_tables_init_net,
11267         .pre_exit       = nf_tables_pre_exit_net,
11268         .exit           = nf_tables_exit_net,
11269         .exit_batch     = nf_tables_exit_batch,
11270         .id             = &nf_tables_net_id,
11271         .size           = sizeof(struct nftables_pernet),
11272 };
11273
11274 static int __init nf_tables_module_init(void)
11275 {
11276         int err;
11277
11278         err = register_pernet_subsys(&nf_tables_net_ops);
11279         if (err < 0)
11280                 return err;
11281
11282         err = nft_chain_filter_init();
11283         if (err < 0)
11284                 goto err_chain_filter;
11285
11286         err = nf_tables_core_module_init();
11287         if (err < 0)
11288                 goto err_core_module;
11289
11290         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11291         if (err < 0)
11292                 goto err_netdev_notifier;
11293
11294         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11295         if (err < 0)
11296                 goto err_rht_objname;
11297
11298         err = nft_offload_init();
11299         if (err < 0)
11300                 goto err_offload;
11301
11302         err = netlink_register_notifier(&nft_nl_notifier);
11303         if (err < 0)
11304                 goto err_netlink_notifier;
11305
11306         /* must be last */
11307         err = nfnetlink_subsys_register(&nf_tables_subsys);
11308         if (err < 0)
11309                 goto err_nfnl_subsys;
11310
11311         nft_chain_route_init();
11312
11313         return err;
11314
11315 err_nfnl_subsys:
11316         netlink_unregister_notifier(&nft_nl_notifier);
11317 err_netlink_notifier:
11318         nft_offload_exit();
11319 err_offload:
11320         rhltable_destroy(&nft_objname_ht);
11321 err_rht_objname:
11322         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11323 err_netdev_notifier:
11324         nf_tables_core_module_exit();
11325 err_core_module:
11326         nft_chain_filter_fini();
11327 err_chain_filter:
11328         unregister_pernet_subsys(&nf_tables_net_ops);
11329         return err;
11330 }
11331
11332 static void __exit nf_tables_module_exit(void)
11333 {
11334         nfnetlink_subsys_unregister(&nf_tables_subsys);
11335         netlink_unregister_notifier(&nft_nl_notifier);
11336         nft_offload_exit();
11337         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11338         nft_chain_filter_fini();
11339         nft_chain_route_fini();
11340         unregister_pernet_subsys(&nf_tables_net_ops);
11341         cancel_work_sync(&trans_gc_work);
11342         cancel_work_sync(&trans_destroy_work);
11343         rcu_barrier();
11344         rhltable_destroy(&nft_objname_ht);
11345         nf_tables_core_module_exit();
11346 }
11347
11348 module_init(nf_tables_module_init);
11349 module_exit(nf_tables_module_exit);
11350
11351 MODULE_LICENSE("GPL");
11352 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11353 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);