net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35
  36 enum {
  37         NFT_VALIDATE_SKIP       = 0,
  38         NFT_VALIDATE_NEED,
  39         NFT_VALIDATE_DO,
  40 };
  41
  42 static struct rhltable nft_objname_ht;
  43
  44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  47
  48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  51
  52 static const struct rhashtable_params nft_chain_ht_params = {
  53         .head_offset            = offsetof(struct nft_chain, rhlhead),
  54         .key_offset             = offsetof(struct nft_chain, name),
  55         .hashfn                 = nft_chain_hash,
  56         .obj_hashfn             = nft_chain_hash_obj,
  57         .obj_cmpfn              = nft_chain_hash_cmp,
  58         .automatic_shrinking    = true,
  59 };
  60
  61 static const struct rhashtable_params nft_objname_ht_params = {
  62         .head_offset            = offsetof(struct nft_object, rhlhead),
  63         .key_offset             = offsetof(struct nft_object, key),
  64         .hashfn                 = nft_objname_hash,
  65         .obj_hashfn             = nft_objname_hash_obj,
  66         .obj_cmpfn              = nft_objname_hash_cmp,
  67         .automatic_shrinking    = true,
  68 };
  69
  70 struct nft_audit_data {
  71         struct nft_table *table;
  72         int entries;
  73         int op;
  74         struct list_head list;
  75 };
  76
  77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  78         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  79         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  80         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  81         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  82         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  84         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  85         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  87         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  88         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  90         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  91         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  93         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  94         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  97         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
  99         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 100         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 101         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 102         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 103 };
 104
 105 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
 106 {
 107         struct nftables_pernet *nft_net = nft_pernet(net);
 108
 109         switch (nft_net->validate_state) {
 110         case NFT_VALIDATE_SKIP:
 111                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 112                 break;
 113         case NFT_VALIDATE_NEED:
 114                 break;
 115         case NFT_VALIDATE_DO:
 116                 if (new_validate_state == NFT_VALIDATE_NEED)
 117                         return;
 118         }
 119
 120         nft_net->validate_state = new_validate_state;
 121 }
 122 static void nf_tables_trans_destroy_work(struct work_struct *w);
 123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 124
 125 static void nft_ctx_init(struct nft_ctx *ctx,
 126                          struct net *net,
 127                          const struct sk_buff *skb,
 128                          const struct nlmsghdr *nlh,
 129                          u8 family,
 130                          struct nft_table *table,
 131                          struct nft_chain *chain,
 132                          const struct nlattr * const *nla)
 133 {
 134         ctx->net        = net;
 135         ctx->family     = family;
 136         ctx->level      = 0;
 137         ctx->table      = table;
 138         ctx->chain      = chain;
 139         ctx->nla        = nla;
 140         ctx->portid     = NETLINK_CB(skb).portid;
 141         ctx->report     = nlmsg_report(nlh);
 142         ctx->flags      = nlh->nlmsg_flags;
 143         ctx->seq        = nlh->nlmsg_seq;
 144 }
 145
 146 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 147                                              int msg_type, u32 size, gfp_t gfp)
 148 {
 149         struct nft_trans *trans;
 150
 151         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 152         if (trans == NULL)
 153                 return NULL;
 154
 155         INIT_LIST_HEAD(&trans->list);
 156         INIT_LIST_HEAD(&trans->binding_list);
 157         trans->msg_type = msg_type;
 158         trans->ctx      = *ctx;
 159
 160         return trans;
 161 }
 162
 163 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 164                                          int msg_type, u32 size)
 165 {
 166         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 167 }
 168
 169 static void nft_trans_list_del(struct nft_trans *trans)
 170 {
 171         list_del(&trans->list);
 172         list_del(&trans->binding_list);
 173 }
 174
 175 static void nft_trans_destroy(struct nft_trans *trans)
 176 {
 177         nft_trans_list_del(trans);
 178         kfree(trans);
 179 }
 180
 181 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
 182                                  bool bind)
 183 {
 184         struct nftables_pernet *nft_net;
 185         struct net *net = ctx->net;
 186         struct nft_trans *trans;
 187
 188         if (!nft_set_is_anonymous(set))
 189                 return;
 190
 191         nft_net = nft_pernet(net);
 192         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 193                 switch (trans->msg_type) {
 194                 case NFT_MSG_NEWSET:
 195                         if (nft_trans_set(trans) == set)
 196                                 nft_trans_set_bound(trans) = bind;
 197                         break;
 198                 case NFT_MSG_NEWSETELEM:
 199                         if (nft_trans_elem_set(trans) == set)
 200                                 nft_trans_elem_set_bound(trans) = bind;
 201                         break;
 202                 }
 203         }
 204 }
 205
 206 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 207 {
 208         return __nft_set_trans_bind(ctx, set, true);
 209 }
 210
 211 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
 212 {
 213         return __nft_set_trans_bind(ctx, set, false);
 214 }
 215
 216 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
 217                                    struct nft_chain *chain, bool bind)
 218 {
 219         struct nftables_pernet *nft_net;
 220         struct net *net = ctx->net;
 221         struct nft_trans *trans;
 222
 223         if (!nft_chain_binding(chain))
 224                 return;
 225
 226         nft_net = nft_pernet(net);
 227         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 228                 switch (trans->msg_type) {
 229                 case NFT_MSG_NEWCHAIN:
 230                         if (nft_trans_chain(trans) == chain)
 231                                 nft_trans_chain_bound(trans) = bind;
 232                         break;
 233                 case NFT_MSG_NEWRULE:
 234                         if (trans->ctx.chain == chain)
 235                                 nft_trans_rule_bound(trans) = bind;
 236                         break;
 237                 }
 238         }
 239 }
 240
 241 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
 242                                  struct nft_chain *chain)
 243 {
 244         __nft_chain_trans_bind(ctx, chain, true);
 245 }
 246
 247 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 248 {
 249         if (!nft_chain_binding(chain))
 250                 return 0;
 251
 252         if (nft_chain_binding(ctx->chain))
 253                 return -EOPNOTSUPP;
 254
 255         if (chain->bound)
 256                 return -EBUSY;
 257
 258         chain->bound = true;
 259         chain->use++;
 260         nft_chain_trans_bind(ctx, chain);
 261
 262         return 0;
 263 }
 264
 265 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 266 {
 267         __nft_chain_trans_bind(ctx, chain, false);
 268 }
 269
 270 static int nft_netdev_register_hooks(struct net *net,
 271                                      struct list_head *hook_list)
 272 {
 273         struct nft_hook *hook;
 274         int err, j;
 275
 276         j = 0;
 277         list_for_each_entry(hook, hook_list, list) {
 278                 err = nf_register_net_hook(net, &hook->ops);
 279                 if (err < 0)
 280                         goto err_register;
 281
 282                 j++;
 283         }
 284         return 0;
 285
 286 err_register:
 287         list_for_each_entry(hook, hook_list, list) {
 288                 if (j-- <= 0)
 289                         break;
 290
 291                 nf_unregister_net_hook(net, &hook->ops);
 292         }
 293         return err;
 294 }
 295
 296 static void nft_netdev_unregister_hooks(struct net *net,
 297                                         struct list_head *hook_list,
 298                                         bool release_netdev)
 299 {
 300         struct nft_hook *hook, *next;
 301
 302         list_for_each_entry_safe(hook, next, hook_list, list) {
 303                 nf_unregister_net_hook(net, &hook->ops);
 304                 if (release_netdev) {
 305                         list_del(&hook->list);
 306                         kfree_rcu(hook, rcu);
 307                 }
 308         }
 309 }
 310
 311 static int nf_tables_register_hook(struct net *net,
 312                                    const struct nft_table *table,
 313                                    struct nft_chain *chain)
 314 {
 315         struct nft_base_chain *basechain;
 316         const struct nf_hook_ops *ops;
 317
 318         if (table->flags & NFT_TABLE_F_DORMANT ||
 319             !nft_is_base_chain(chain))
 320                 return 0;
 321
 322         basechain = nft_base_chain(chain);
 323         ops = &basechain->ops;
 324
 325         if (basechain->type->ops_register)
 326                 return basechain->type->ops_register(net, ops);
 327
 328         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 329                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 330
 331         return nf_register_net_hook(net, &basechain->ops);
 332 }
 333
 334 static void __nf_tables_unregister_hook(struct net *net,
 335                                         const struct nft_table *table,
 336                                         struct nft_chain *chain,
 337                                         bool release_netdev)
 338 {
 339         struct nft_base_chain *basechain;
 340         const struct nf_hook_ops *ops;
 341
 342         if (table->flags & NFT_TABLE_F_DORMANT ||
 343             !nft_is_base_chain(chain))
 344                 return;
 345         basechain = nft_base_chain(chain);
 346         ops = &basechain->ops;
 347
 348         if (basechain->type->ops_unregister)
 349                 return basechain->type->ops_unregister(net, ops);
 350
 351         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 352                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 353                                             release_netdev);
 354         else
 355                 nf_unregister_net_hook(net, &basechain->ops);
 356 }
 357
 358 static void nf_tables_unregister_hook(struct net *net,
 359                                       const struct nft_table *table,
 360                                       struct nft_chain *chain)
 361 {
 362         return __nf_tables_unregister_hook(net, table, chain, false);
 363 }
 364
 365 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 366 {
 367         struct nftables_pernet *nft_net = nft_pernet(net);
 368
 369         switch (trans->msg_type) {
 370         case NFT_MSG_NEWSET:
 371                 if (!nft_trans_set_update(trans) &&
 372                     nft_set_is_anonymous(nft_trans_set(trans)))
 373                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 374                 break;
 375         case NFT_MSG_NEWCHAIN:
 376                 if (!nft_trans_chain_update(trans) &&
 377                     nft_chain_binding(nft_trans_chain(trans)))
 378                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 379                 break;
 380         }
 381
 382         list_add_tail(&trans->list, &nft_net->commit_list);
 383 }
 384
 385 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 386 {
 387         struct nft_trans *trans;
 388
 389         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 390         if (trans == NULL)
 391                 return -ENOMEM;
 392
 393         if (msg_type == NFT_MSG_NEWTABLE)
 394                 nft_activate_next(ctx->net, ctx->table);
 395
 396         nft_trans_commit_list_add_tail(ctx->net, trans);
 397         return 0;
 398 }
 399
 400 static int nft_deltable(struct nft_ctx *ctx)
 401 {
 402         int err;
 403
 404         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 405         if (err < 0)
 406                 return err;
 407
 408         nft_deactivate_next(ctx->net, ctx->table);
 409         return err;
 410 }
 411
 412 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 413 {
 414         struct nft_trans *trans;
 415
 416         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 417         if (trans == NULL)
 418                 return ERR_PTR(-ENOMEM);
 419
 420         if (msg_type == NFT_MSG_NEWCHAIN) {
 421                 nft_activate_next(ctx->net, ctx->chain);
 422
 423                 if (ctx->nla[NFTA_CHAIN_ID]) {
 424                         nft_trans_chain_id(trans) =
 425                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 426                 }
 427         }
 428         nft_trans_chain(trans) = ctx->chain;
 429         nft_trans_commit_list_add_tail(ctx->net, trans);
 430
 431         return trans;
 432 }
 433
 434 static int nft_delchain(struct nft_ctx *ctx)
 435 {
 436         struct nft_trans *trans;
 437
 438         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 439         if (IS_ERR(trans))
 440                 return PTR_ERR(trans);
 441
 442         ctx->table->use--;
 443         nft_deactivate_next(ctx->net, ctx->chain);
 444
 445         return 0;
 446 }
 447
 448 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
 449 {
 450         struct nft_expr *expr;
 451
 452         expr = nft_expr_first(rule);
 453         while (nft_expr_more(rule, expr)) {
 454                 if (expr->ops->activate)
 455                         expr->ops->activate(ctx, expr);
 456
 457                 expr = nft_expr_next(expr);
 458         }
 459 }
 460
 461 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
 462                               enum nft_trans_phase phase)
 463 {
 464         struct nft_expr *expr;
 465
 466         expr = nft_expr_first(rule);
 467         while (nft_expr_more(rule, expr)) {
 468                 if (expr->ops->deactivate)
 469                         expr->ops->deactivate(ctx, expr, phase);
 470
 471                 expr = nft_expr_next(expr);
 472         }
 473 }
 474
 475 static int
 476 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 477 {
 478         /* You cannot delete the same rule twice */
 479         if (nft_is_active_next(ctx->net, rule)) {
 480                 nft_deactivate_next(ctx->net, rule);
 481                 ctx->chain->use--;
 482                 return 0;
 483         }
 484         return -ENOENT;
 485 }
 486
 487 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 488                                             struct nft_rule *rule)
 489 {
 490         struct nft_trans *trans;
 491
 492         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 493         if (trans == NULL)
 494                 return NULL;
 495
 496         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 497                 nft_trans_rule_id(trans) =
 498                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 499         }
 500         nft_trans_rule(trans) = rule;
 501         nft_trans_commit_list_add_tail(ctx->net, trans);
 502
 503         return trans;
 504 }
 505
 506 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 507 {
 508         struct nft_flow_rule *flow;
 509         struct nft_trans *trans;
 510         int err;
 511
 512         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 513         if (trans == NULL)
 514                 return -ENOMEM;
 515
 516         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 517                 flow = nft_flow_rule_create(ctx->net, rule);
 518                 if (IS_ERR(flow)) {
 519                         nft_trans_destroy(trans);
 520                         return PTR_ERR(flow);
 521                 }
 522
 523                 nft_trans_flow_rule(trans) = flow;
 524         }
 525
 526         err = nf_tables_delrule_deactivate(ctx, rule);
 527         if (err < 0) {
 528                 nft_trans_destroy(trans);
 529                 return err;
 530         }
 531         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 532
 533         return 0;
 534 }
 535
 536 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 537 {
 538         struct nft_rule *rule;
 539         int err;
 540
 541         list_for_each_entry(rule, &ctx->chain->rules, list) {
 542                 if (!nft_is_active_next(ctx->net, rule))
 543                         continue;
 544
 545                 err = nft_delrule(ctx, rule);
 546                 if (err < 0)
 547                         return err;
 548         }
 549         return 0;
 550 }
 551
 552 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 553                                struct nft_set *set,
 554                                const struct nft_set_desc *desc)
 555 {
 556         struct nft_trans *trans;
 557
 558         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 559         if (trans == NULL)
 560                 return -ENOMEM;
 561
 562         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 563                 nft_trans_set_id(trans) =
 564                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 565                 nft_activate_next(ctx->net, set);
 566         }
 567         nft_trans_set(trans) = set;
 568         if (desc) {
 569                 nft_trans_set_update(trans) = true;
 570                 nft_trans_set_gc_int(trans) = desc->gc_int;
 571                 nft_trans_set_timeout(trans) = desc->timeout;
 572         }
 573         nft_trans_commit_list_add_tail(ctx->net, trans);
 574
 575         return 0;
 576 }
 577
 578 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 579                              struct nft_set *set)
 580 {
 581         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 582 }
 583
 584 static void nft_setelem_data_deactivate(const struct net *net,
 585                                         const struct nft_set *set,
 586                                         struct nft_set_elem *elem);
 587
 588 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
 589                                   struct nft_set *set,
 590                                   const struct nft_set_iter *iter,
 591                                   struct nft_set_elem *elem)
 592 {
 593         nft_setelem_data_deactivate(ctx->net, set, elem);
 594
 595         return 0;
 596 }
 597
 598 struct nft_set_elem_catchall {
 599         struct list_head        list;
 600         struct rcu_head         rcu;
 601         void                    *elem;
 602 };
 603
 604 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
 605                                         struct nft_set *set)
 606 {
 607         u8 genmask = nft_genmask_next(ctx->net);
 608         struct nft_set_elem_catchall *catchall;
 609         struct nft_set_elem elem;
 610         struct nft_set_ext *ext;
 611
 612         list_for_each_entry(catchall, &set->catchall_list, list) {
 613                 ext = nft_set_elem_ext(set, catchall->elem);
 614                 if (!nft_set_elem_active(ext, genmask))
 615                         continue;
 616
 617                 elem.priv = catchall->elem;
 618                 nft_setelem_data_deactivate(ctx->net, set, &elem);
 619                 break;
 620         }
 621 }
 622
 623 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
 624 {
 625         struct nft_set_iter iter = {
 626                 .genmask        = nft_genmask_next(ctx->net),
 627                 .fn             = nft_mapelem_deactivate,
 628         };
 629
 630         set->ops->walk(ctx, set, &iter);
 631         WARN_ON_ONCE(iter.err);
 632
 633         nft_map_catchall_deactivate(ctx, set);
 634 }
 635
 636 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 637 {
 638         int err;
 639
 640         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 641         if (err < 0)
 642                 return err;
 643
 644         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
 645                 nft_map_deactivate(ctx, set);
 646
 647         nft_deactivate_next(ctx->net, set);
 648         ctx->table->use--;
 649
 650         return err;
 651 }
 652
 653 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 654                              struct nft_object *obj)
 655 {
 656         struct nft_trans *trans;
 657
 658         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 659         if (trans == NULL)
 660                 return -ENOMEM;
 661
 662         if (msg_type == NFT_MSG_NEWOBJ)
 663                 nft_activate_next(ctx->net, obj);
 664
 665         nft_trans_obj(trans) = obj;
 666         nft_trans_commit_list_add_tail(ctx->net, trans);
 667
 668         return 0;
 669 }
 670
 671 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 672 {
 673         int err;
 674
 675         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 676         if (err < 0)
 677                 return err;
 678
 679         nft_deactivate_next(ctx->net, obj);
 680         ctx->table->use--;
 681
 682         return err;
 683 }
 684
 685 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 686                                    struct nft_flowtable *flowtable)
 687 {
 688         struct nft_trans *trans;
 689
 690         trans = nft_trans_alloc(ctx, msg_type,
 691                                 sizeof(struct nft_trans_flowtable));
 692         if (trans == NULL)
 693                 return -ENOMEM;
 694
 695         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 696                 nft_activate_next(ctx->net, flowtable);
 697
 698         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 699         nft_trans_flowtable(trans) = flowtable;
 700         nft_trans_commit_list_add_tail(ctx->net, trans);
 701
 702         return 0;
 703 }
 704
 705 static int nft_delflowtable(struct nft_ctx *ctx,
 706                             struct nft_flowtable *flowtable)
 707 {
 708         int err;
 709
 710         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 711         if (err < 0)
 712                 return err;
 713
 714         nft_deactivate_next(ctx->net, flowtable);
 715         ctx->table->use--;
 716
 717         return err;
 718 }
 719
 720 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 721 {
 722         int i;
 723
 724         for (i = track->regs[dreg].num_reg; i > 0; i--)
 725                 __nft_reg_track_cancel(track, dreg - i);
 726 }
 727
 728 static void __nft_reg_track_update(struct nft_regs_track *track,
 729                                    const struct nft_expr *expr,
 730                                    u8 dreg, u8 num_reg)
 731 {
 732         track->regs[dreg].selector = expr;
 733         track->regs[dreg].bitwise = NULL;
 734         track->regs[dreg].num_reg = num_reg;
 735 }
 736
 737 void nft_reg_track_update(struct nft_regs_track *track,
 738                           const struct nft_expr *expr, u8 dreg, u8 len)
 739 {
 740         unsigned int regcount;
 741         int i;
 742
 743         __nft_reg_track_clobber(track, dreg);
 744
 745         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 746         for (i = 0; i < regcount; i++, dreg++)
 747                 __nft_reg_track_update(track, expr, dreg, i);
 748 }
 749 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 750
 751 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 752 {
 753         unsigned int regcount;
 754         int i;
 755
 756         __nft_reg_track_clobber(track, dreg);
 757
 758         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 759         for (i = 0; i < regcount; i++, dreg++)
 760                 __nft_reg_track_cancel(track, dreg);
 761 }
 762 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 763
 764 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 765 {
 766         track->regs[dreg].selector = NULL;
 767         track->regs[dreg].bitwise = NULL;
 768         track->regs[dreg].num_reg = 0;
 769 }
 770 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 771
 772 /*
 773  * Tables
 774  */
 775
 776 static struct nft_table *nft_table_lookup(const struct net *net,
 777                                           const struct nlattr *nla,
 778                                           u8 family, u8 genmask, u32 nlpid)
 779 {
 780         struct nftables_pernet *nft_net;
 781         struct nft_table *table;
 782
 783         if (nla == NULL)
 784                 return ERR_PTR(-EINVAL);
 785
 786         nft_net = nft_pernet(net);
 787         list_for_each_entry_rcu(table, &nft_net->tables, list,
 788                                 lockdep_is_held(&nft_net->commit_mutex)) {
 789                 if (!nla_strcmp(nla, table->name) &&
 790                     table->family == family &&
 791                     nft_active_genmask(table, genmask)) {
 792                         if (nft_table_has_owner(table) &&
 793                             nlpid && table->nlpid != nlpid)
 794                                 return ERR_PTR(-EPERM);
 795
 796                         return table;
 797                 }
 798         }
 799
 800         return ERR_PTR(-ENOENT);
 801 }
 802
 803 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 804                                                    const struct nlattr *nla,
 805                                                    u8 genmask, u32 nlpid)
 806 {
 807         struct nftables_pernet *nft_net;
 808         struct nft_table *table;
 809
 810         nft_net = nft_pernet(net);
 811         list_for_each_entry(table, &nft_net->tables, list) {
 812                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 813                     nft_active_genmask(table, genmask)) {
 814                         if (nft_table_has_owner(table) &&
 815                             nlpid && table->nlpid != nlpid)
 816                                 return ERR_PTR(-EPERM);
 817
 818                         return table;
 819                 }
 820         }
 821
 822         return ERR_PTR(-ENOENT);
 823 }
 824
 825 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 826 {
 827         return ++table->hgenerator;
 828 }
 829
 830 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 831
 832 static const struct nft_chain_type *
 833 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 834 {
 835         if (family >= NFPROTO_NUMPROTO ||
 836             type >= NFT_CHAIN_T_MAX)
 837                 return NULL;
 838
 839         return chain_type[family][type];
 840 }
 841
 842 static const struct nft_chain_type *
 843 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 844 {
 845         const struct nft_chain_type *type;
 846         int i;
 847
 848         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 849                 type = __nft_chain_type_get(family, i);
 850                 if (!type)
 851                         continue;
 852                 if (!nla_strcmp(nla, type->name))
 853                         return type;
 854         }
 855         return NULL;
 856 }
 857
 858 struct nft_module_request {
 859         struct list_head        list;
 860         char                    module[MODULE_NAME_LEN];
 861         bool                    done;
 862 };
 863
 864 #ifdef CONFIG_MODULES
 865 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 866                                       ...)
 867 {
 868         char module_name[MODULE_NAME_LEN];
 869         struct nftables_pernet *nft_net;
 870         struct nft_module_request *req;
 871         va_list args;
 872         int ret;
 873
 874         va_start(args, fmt);
 875         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 876         va_end(args);
 877         if (ret >= MODULE_NAME_LEN)
 878                 return 0;
 879
 880         nft_net = nft_pernet(net);
 881         list_for_each_entry(req, &nft_net->module_list, list) {
 882                 if (!strcmp(req->module, module_name)) {
 883                         if (req->done)
 884                                 return 0;
 885
 886                         /* A request to load this module already exists. */
 887                         return -EAGAIN;
 888                 }
 889         }
 890
 891         req = kmalloc(sizeof(*req), GFP_KERNEL);
 892         if (!req)
 893                 return -ENOMEM;
 894
 895         req->done = false;
 896         strscpy(req->module, module_name, MODULE_NAME_LEN);
 897         list_add_tail(&req->list, &nft_net->module_list);
 898
 899         return -EAGAIN;
 900 }
 901 EXPORT_SYMBOL_GPL(nft_request_module);
 902 #endif
 903
 904 static void lockdep_nfnl_nft_mutex_not_held(void)
 905 {
 906 #ifdef CONFIG_PROVE_LOCKING
 907         if (debug_locks)
 908                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 909 #endif
 910 }
 911
 912 static const struct nft_chain_type *
 913 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 914                             u8 family, bool autoload)
 915 {
 916         const struct nft_chain_type *type;
 917
 918         type = __nf_tables_chain_type_lookup(nla, family);
 919         if (type != NULL)
 920                 return type;
 921
 922         lockdep_nfnl_nft_mutex_not_held();
 923 #ifdef CONFIG_MODULES
 924         if (autoload) {
 925                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 926                                        nla_len(nla),
 927                                        (const char *)nla_data(nla)) == -EAGAIN)
 928                         return ERR_PTR(-EAGAIN);
 929         }
 930 #endif
 931         return ERR_PTR(-ENOENT);
 932 }
 933
 934 static __be16 nft_base_seq(const struct net *net)
 935 {
 936         struct nftables_pernet *nft_net = nft_pernet(net);
 937
 938         return htons(nft_net->base_seq & 0xffff);
 939 }
 940
 941 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 942         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 943                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 944         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 945         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 946         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 947                                     .len = NFT_USERDATA_MAXLEN }
 948 };
 949
 950 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 951                                      u32 portid, u32 seq, int event, u32 flags,
 952                                      int family, const struct nft_table *table)
 953 {
 954         struct nlmsghdr *nlh;
 955
 956         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 957         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 958                            NFNETLINK_V0, nft_base_seq(net));
 959         if (!nlh)
 960                 goto nla_put_failure;
 961
 962         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 963             nla_put_be32(skb, NFTA_TABLE_FLAGS,
 964                          htonl(table->flags & NFT_TABLE_F_MASK)) ||
 965             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 966             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 967                          NFTA_TABLE_PAD))
 968                 goto nla_put_failure;
 969         if (nft_table_has_owner(table) &&
 970             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 971                 goto nla_put_failure;
 972
 973         if (table->udata) {
 974                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 975                         goto nla_put_failure;
 976         }
 977
 978         nlmsg_end(skb, nlh);
 979         return 0;
 980
 981 nla_put_failure:
 982         nlmsg_trim(skb, nlh);
 983         return -1;
 984 }
 985
 986 struct nftnl_skb_parms {
 987         bool report;
 988 };
 989 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 990
 991 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 992                                struct list_head *notify_list)
 993 {
 994         NFT_CB(skb).report = report;
 995         list_add_tail(&skb->list, notify_list);
 996 }
 997
 998 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 999 {
1000         struct nftables_pernet *nft_net;
1001         struct sk_buff *skb;
1002         u16 flags = 0;
1003         int err;
1004
1005         if (!ctx->report &&
1006             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1007                 return;
1008
1009         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1010         if (skb == NULL)
1011                 goto err;
1012
1013         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1014                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1015
1016         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1017                                         event, flags, ctx->family, ctx->table);
1018         if (err < 0) {
1019                 kfree_skb(skb);
1020                 goto err;
1021         }
1022
1023         nft_net = nft_pernet(ctx->net);
1024         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1025         return;
1026 err:
1027         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1028 }
1029
1030 static int nf_tables_dump_tables(struct sk_buff *skb,
1031                                  struct netlink_callback *cb)
1032 {
1033         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1034         struct nftables_pernet *nft_net;
1035         const struct nft_table *table;
1036         unsigned int idx = 0, s_idx = cb->args[0];
1037         struct net *net = sock_net(skb->sk);
1038         int family = nfmsg->nfgen_family;
1039
1040         rcu_read_lock();
1041         nft_net = nft_pernet(net);
1042         cb->seq = READ_ONCE(nft_net->base_seq);
1043
1044         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1045                 if (family != NFPROTO_UNSPEC && family != table->family)
1046                         continue;
1047
1048                 if (idx < s_idx)
1049                         goto cont;
1050                 if (idx > s_idx)
1051                         memset(&cb->args[1], 0,
1052                                sizeof(cb->args) - sizeof(cb->args[0]));
1053                 if (!nft_is_active(net, table))
1054                         continue;
1055                 if (nf_tables_fill_table_info(skb, net,
1056                                               NETLINK_CB(cb->skb).portid,
1057                                               cb->nlh->nlmsg_seq,
1058                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
1059                                               table->family, table) < 0)
1060                         goto done;
1061
1062                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1063 cont:
1064                 idx++;
1065         }
1066 done:
1067         rcu_read_unlock();
1068         cb->args[0] = idx;
1069         return skb->len;
1070 }
1071
1072 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1073                                       const struct nlmsghdr *nlh,
1074                                       struct netlink_dump_control *c)
1075 {
1076         int err;
1077
1078         if (!try_module_get(THIS_MODULE))
1079                 return -EINVAL;
1080
1081         rcu_read_unlock();
1082         err = netlink_dump_start(nlsk, skb, nlh, c);
1083         rcu_read_lock();
1084         module_put(THIS_MODULE);
1085
1086         return err;
1087 }
1088
1089 /* called with rcu_read_lock held */
1090 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1091                               const struct nlattr * const nla[])
1092 {
1093         struct netlink_ext_ack *extack = info->extack;
1094         u8 genmask = nft_genmask_cur(info->net);
1095         u8 family = info->nfmsg->nfgen_family;
1096         const struct nft_table *table;
1097         struct net *net = info->net;
1098         struct sk_buff *skb2;
1099         int err;
1100
1101         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1102                 struct netlink_dump_control c = {
1103                         .dump = nf_tables_dump_tables,
1104                         .module = THIS_MODULE,
1105                 };
1106
1107                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1108         }
1109
1110         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1111         if (IS_ERR(table)) {
1112                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1113                 return PTR_ERR(table);
1114         }
1115
1116         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1117         if (!skb2)
1118                 return -ENOMEM;
1119
1120         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1121                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1122                                         0, family, table);
1123         if (err < 0)
1124                 goto err_fill_table_info;
1125
1126         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1127
1128 err_fill_table_info:
1129         kfree_skb(skb2);
1130         return err;
1131 }
1132
1133 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1134 {
1135         struct nft_chain *chain;
1136         u32 i = 0;
1137
1138         list_for_each_entry(chain, &table->chains, list) {
1139                 if (!nft_is_active_next(net, chain))
1140                         continue;
1141                 if (!nft_is_base_chain(chain))
1142                         continue;
1143
1144                 if (cnt && i++ == cnt)
1145                         break;
1146
1147                 nf_tables_unregister_hook(net, table, chain);
1148         }
1149 }
1150
1151 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1152 {
1153         struct nft_chain *chain;
1154         int err, i = 0;
1155
1156         list_for_each_entry(chain, &table->chains, list) {
1157                 if (!nft_is_active_next(net, chain))
1158                         continue;
1159                 if (!nft_is_base_chain(chain))
1160                         continue;
1161
1162                 err = nf_tables_register_hook(net, table, chain);
1163                 if (err < 0)
1164                         goto err_register_hooks;
1165
1166                 i++;
1167         }
1168         return 0;
1169
1170 err_register_hooks:
1171         if (i)
1172                 nft_table_disable(net, table, i);
1173         return err;
1174 }
1175
1176 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1177 {
1178         table->flags &= ~NFT_TABLE_F_DORMANT;
1179         nft_table_disable(net, table, 0);
1180         table->flags |= NFT_TABLE_F_DORMANT;
1181 }
1182
1183 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1184 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1185 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1186 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1187                                          __NFT_TABLE_F_WAS_AWAKEN)
1188
1189 static int nf_tables_updtable(struct nft_ctx *ctx)
1190 {
1191         struct nft_trans *trans;
1192         u32 flags;
1193         int ret;
1194
1195         if (!ctx->nla[NFTA_TABLE_FLAGS])
1196                 return 0;
1197
1198         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1199         if (flags & ~NFT_TABLE_F_MASK)
1200                 return -EOPNOTSUPP;
1201
1202         if (flags == ctx->table->flags)
1203                 return 0;
1204
1205         if ((nft_table_has_owner(ctx->table) &&
1206              !(flags & NFT_TABLE_F_OWNER)) ||
1207             (!nft_table_has_owner(ctx->table) &&
1208              flags & NFT_TABLE_F_OWNER))
1209                 return -EOPNOTSUPP;
1210
1211         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1212                                 sizeof(struct nft_trans_table));
1213         if (trans == NULL)
1214                 return -ENOMEM;
1215
1216         if ((flags & NFT_TABLE_F_DORMANT) &&
1217             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1218                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1219                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1220                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1221         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1222                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1223                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1224                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1225                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1226                         if (ret < 0)
1227                                 goto err_register_hooks;
1228
1229                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1230                 }
1231         }
1232
1233         nft_trans_table_update(trans) = true;
1234         nft_trans_commit_list_add_tail(ctx->net, trans);
1235
1236         return 0;
1237
1238 err_register_hooks:
1239         nft_trans_destroy(trans);
1240         return ret;
1241 }
1242
1243 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1244 {
1245         const char *name = data;
1246
1247         return jhash(name, strlen(name), seed);
1248 }
1249
1250 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1251 {
1252         const struct nft_chain *chain = data;
1253
1254         return nft_chain_hash(chain->name, 0, seed);
1255 }
1256
1257 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1258                               const void *ptr)
1259 {
1260         const struct nft_chain *chain = ptr;
1261         const char *name = arg->key;
1262
1263         return strcmp(chain->name, name);
1264 }
1265
1266 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1267 {
1268         const struct nft_object_hash_key *k = data;
1269
1270         seed ^= hash_ptr(k->table, 32);
1271
1272         return jhash(k->name, strlen(k->name), seed);
1273 }
1274
1275 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1276 {
1277         const struct nft_object *obj = data;
1278
1279         return nft_objname_hash(&obj->key, 0, seed);
1280 }
1281
1282 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1283                                 const void *ptr)
1284 {
1285         const struct nft_object_hash_key *k = arg->key;
1286         const struct nft_object *obj = ptr;
1287
1288         if (obj->key.table != k->table)
1289                 return -1;
1290
1291         return strcmp(obj->key.name, k->name);
1292 }
1293
1294 static bool nft_supported_family(u8 family)
1295 {
1296         return false
1297 #ifdef CONFIG_NF_TABLES_INET
1298                 || family == NFPROTO_INET
1299 #endif
1300 #ifdef CONFIG_NF_TABLES_IPV4
1301                 || family == NFPROTO_IPV4
1302 #endif
1303 #ifdef CONFIG_NF_TABLES_ARP
1304                 || family == NFPROTO_ARP
1305 #endif
1306 #ifdef CONFIG_NF_TABLES_NETDEV
1307                 || family == NFPROTO_NETDEV
1308 #endif
1309 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1310                 || family == NFPROTO_BRIDGE
1311 #endif
1312 #ifdef CONFIG_NF_TABLES_IPV6
1313                 || family == NFPROTO_IPV6
1314 #endif
1315                 ;
1316 }
1317
1318 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1319                               const struct nlattr * const nla[])
1320 {
1321         struct nftables_pernet *nft_net = nft_pernet(info->net);
1322         struct netlink_ext_ack *extack = info->extack;
1323         u8 genmask = nft_genmask_next(info->net);
1324         u8 family = info->nfmsg->nfgen_family;
1325         struct net *net = info->net;
1326         const struct nlattr *attr;
1327         struct nft_table *table;
1328         struct nft_ctx ctx;
1329         u32 flags = 0;
1330         int err;
1331
1332         if (!nft_supported_family(family))
1333                 return -EOPNOTSUPP;
1334
1335         lockdep_assert_held(&nft_net->commit_mutex);
1336         attr = nla[NFTA_TABLE_NAME];
1337         table = nft_table_lookup(net, attr, family, genmask,
1338                                  NETLINK_CB(skb).portid);
1339         if (IS_ERR(table)) {
1340                 if (PTR_ERR(table) != -ENOENT)
1341                         return PTR_ERR(table);
1342         } else {
1343                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1344                         NL_SET_BAD_ATTR(extack, attr);
1345                         return -EEXIST;
1346                 }
1347                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1348                         return -EOPNOTSUPP;
1349
1350                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1351
1352                 return nf_tables_updtable(&ctx);
1353         }
1354
1355         if (nla[NFTA_TABLE_FLAGS]) {
1356                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1357                 if (flags & ~NFT_TABLE_F_MASK)
1358                         return -EOPNOTSUPP;
1359         }
1360
1361         err = -ENOMEM;
1362         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1363         if (table == NULL)
1364                 goto err_kzalloc;
1365
1366         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1367         if (table->name == NULL)
1368                 goto err_strdup;
1369
1370         if (nla[NFTA_TABLE_USERDATA]) {
1371                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1372                 if (table->udata == NULL)
1373                         goto err_table_udata;
1374
1375                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1376         }
1377
1378         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1379         if (err)
1380                 goto err_chain_ht;
1381
1382         INIT_LIST_HEAD(&table->chains);
1383         INIT_LIST_HEAD(&table->sets);
1384         INIT_LIST_HEAD(&table->objects);
1385         INIT_LIST_HEAD(&table->flowtables);
1386         table->family = family;
1387         table->flags = flags;
1388         table->handle = ++nft_net->table_handle;
1389         if (table->flags & NFT_TABLE_F_OWNER)
1390                 table->nlpid = NETLINK_CB(skb).portid;
1391
1392         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1393         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1394         if (err < 0)
1395                 goto err_trans;
1396
1397         list_add_tail_rcu(&table->list, &nft_net->tables);
1398         return 0;
1399 err_trans:
1400         rhltable_destroy(&table->chains_ht);
1401 err_chain_ht:
1402         kfree(table->udata);
1403 err_table_udata:
1404         kfree(table->name);
1405 err_strdup:
1406         kfree(table);
1407 err_kzalloc:
1408         return err;
1409 }
1410
1411 static int nft_flush_table(struct nft_ctx *ctx)
1412 {
1413         struct nft_flowtable *flowtable, *nft;
1414         struct nft_chain *chain, *nc;
1415         struct nft_object *obj, *ne;
1416         struct nft_set *set, *ns;
1417         int err;
1418
1419         list_for_each_entry(chain, &ctx->table->chains, list) {
1420                 if (!nft_is_active_next(ctx->net, chain))
1421                         continue;
1422
1423                 if (nft_chain_is_bound(chain))
1424                         continue;
1425
1426                 ctx->chain = chain;
1427
1428                 err = nft_delrule_by_chain(ctx);
1429                 if (err < 0)
1430                         goto out;
1431         }
1432
1433         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1434                 if (!nft_is_active_next(ctx->net, set))
1435                         continue;
1436
1437                 if (nft_set_is_anonymous(set) &&
1438                     !list_empty(&set->bindings))
1439                         continue;
1440
1441                 err = nft_delset(ctx, set);
1442                 if (err < 0)
1443                         goto out;
1444         }
1445
1446         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1447                 if (!nft_is_active_next(ctx->net, flowtable))
1448                         continue;
1449
1450                 err = nft_delflowtable(ctx, flowtable);
1451                 if (err < 0)
1452                         goto out;
1453         }
1454
1455         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1456                 if (!nft_is_active_next(ctx->net, obj))
1457                         continue;
1458
1459                 err = nft_delobj(ctx, obj);
1460                 if (err < 0)
1461                         goto out;
1462         }
1463
1464         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1465                 if (!nft_is_active_next(ctx->net, chain))
1466                         continue;
1467
1468                 if (nft_chain_is_bound(chain))
1469                         continue;
1470
1471                 ctx->chain = chain;
1472
1473                 err = nft_delchain(ctx);
1474                 if (err < 0)
1475                         goto out;
1476         }
1477
1478         err = nft_deltable(ctx);
1479 out:
1480         return err;
1481 }
1482
1483 static int nft_flush(struct nft_ctx *ctx, int family)
1484 {
1485         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1486         const struct nlattr * const *nla = ctx->nla;
1487         struct nft_table *table, *nt;
1488         int err = 0;
1489
1490         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1491                 if (family != AF_UNSPEC && table->family != family)
1492                         continue;
1493
1494                 ctx->family = table->family;
1495
1496                 if (!nft_is_active_next(ctx->net, table))
1497                         continue;
1498
1499                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1500                         continue;
1501
1502                 if (nla[NFTA_TABLE_NAME] &&
1503                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1504                         continue;
1505
1506                 ctx->table = table;
1507
1508                 err = nft_flush_table(ctx);
1509                 if (err < 0)
1510                         goto out;
1511         }
1512 out:
1513         return err;
1514 }
1515
1516 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1517                               const struct nlattr * const nla[])
1518 {
1519         struct netlink_ext_ack *extack = info->extack;
1520         u8 genmask = nft_genmask_next(info->net);
1521         u8 family = info->nfmsg->nfgen_family;
1522         struct net *net = info->net;
1523         const struct nlattr *attr;
1524         struct nft_table *table;
1525         struct nft_ctx ctx;
1526
1527         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1528         if (family == AF_UNSPEC ||
1529             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1530                 return nft_flush(&ctx, family);
1531
1532         if (nla[NFTA_TABLE_HANDLE]) {
1533                 attr = nla[NFTA_TABLE_HANDLE];
1534                 table = nft_table_lookup_byhandle(net, attr, genmask,
1535                                                   NETLINK_CB(skb).portid);
1536         } else {
1537                 attr = nla[NFTA_TABLE_NAME];
1538                 table = nft_table_lookup(net, attr, family, genmask,
1539                                          NETLINK_CB(skb).portid);
1540         }
1541
1542         if (IS_ERR(table)) {
1543                 NL_SET_BAD_ATTR(extack, attr);
1544                 return PTR_ERR(table);
1545         }
1546
1547         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1548             table->use > 0)
1549                 return -EBUSY;
1550
1551         ctx.family = family;
1552         ctx.table = table;
1553
1554         return nft_flush_table(&ctx);
1555 }
1556
1557 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1558 {
1559         if (WARN_ON(ctx->table->use > 0))
1560                 return;
1561
1562         rhltable_destroy(&ctx->table->chains_ht);
1563         kfree(ctx->table->name);
1564         kfree(ctx->table->udata);
1565         kfree(ctx->table);
1566 }
1567
1568 void nft_register_chain_type(const struct nft_chain_type *ctype)
1569 {
1570         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1571         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1572                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1573                 return;
1574         }
1575         chain_type[ctype->family][ctype->type] = ctype;
1576         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1577 }
1578 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1579
1580 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1581 {
1582         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1583         chain_type[ctype->family][ctype->type] = NULL;
1584         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1585 }
1586 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1587
1588 /*
1589  * Chains
1590  */
1591
1592 static struct nft_chain *
1593 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1594 {
1595         struct nft_chain *chain;
1596
1597         list_for_each_entry(chain, &table->chains, list) {
1598                 if (chain->handle == handle &&
1599                     nft_active_genmask(chain, genmask))
1600                         return chain;
1601         }
1602
1603         return ERR_PTR(-ENOENT);
1604 }
1605
1606 static bool lockdep_commit_lock_is_held(const struct net *net)
1607 {
1608 #ifdef CONFIG_PROVE_LOCKING
1609         struct nftables_pernet *nft_net = nft_pernet(net);
1610
1611         return lockdep_is_held(&nft_net->commit_mutex);
1612 #else
1613         return true;
1614 #endif
1615 }
1616
1617 static struct nft_chain *nft_chain_lookup(struct net *net,
1618                                           struct nft_table *table,
1619                                           const struct nlattr *nla, u8 genmask)
1620 {
1621         char search[NFT_CHAIN_MAXNAMELEN + 1];
1622         struct rhlist_head *tmp, *list;
1623         struct nft_chain *chain;
1624
1625         if (nla == NULL)
1626                 return ERR_PTR(-EINVAL);
1627
1628         nla_strscpy(search, nla, sizeof(search));
1629
1630         WARN_ON(!rcu_read_lock_held() &&
1631                 !lockdep_commit_lock_is_held(net));
1632
1633         chain = ERR_PTR(-ENOENT);
1634         rcu_read_lock();
1635         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1636         if (!list)
1637                 goto out_unlock;
1638
1639         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1640                 if (nft_active_genmask(chain, genmask))
1641                         goto out_unlock;
1642         }
1643         chain = ERR_PTR(-ENOENT);
1644 out_unlock:
1645         rcu_read_unlock();
1646         return chain;
1647 }
1648
1649 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1650         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1651                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1652         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1653         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1654                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1655         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1656         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1657         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1658                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1659         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1660         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1661         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1662         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1663                                     .len = NFT_USERDATA_MAXLEN },
1664 };
1665
1666 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1667         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1668         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1669         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1670                                     .len = IFNAMSIZ - 1 },
1671 };
1672
1673 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1674 {
1675         struct nft_stats *cpu_stats, total;
1676         struct nlattr *nest;
1677         unsigned int seq;
1678         u64 pkts, bytes;
1679         int cpu;
1680
1681         if (!stats)
1682                 return 0;
1683
1684         memset(&total, 0, sizeof(total));
1685         for_each_possible_cpu(cpu) {
1686                 cpu_stats = per_cpu_ptr(stats, cpu);
1687                 do {
1688                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1689                         pkts = cpu_stats->pkts;
1690                         bytes = cpu_stats->bytes;
1691                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1692                 total.pkts += pkts;
1693                 total.bytes += bytes;
1694         }
1695         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1696         if (nest == NULL)
1697                 goto nla_put_failure;
1698
1699         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1700                          NFTA_COUNTER_PAD) ||
1701             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1702                          NFTA_COUNTER_PAD))
1703                 goto nla_put_failure;
1704
1705         nla_nest_end(skb, nest);
1706         return 0;
1707
1708 nla_put_failure:
1709         return -ENOSPC;
1710 }
1711
1712 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1713                                    const struct nft_base_chain *basechain)
1714 {
1715         const struct nf_hook_ops *ops = &basechain->ops;
1716         struct nft_hook *hook, *first = NULL;
1717         struct nlattr *nest, *nest_devs;
1718         int n = 0;
1719
1720         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1721         if (nest == NULL)
1722                 goto nla_put_failure;
1723         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1724                 goto nla_put_failure;
1725         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1726                 goto nla_put_failure;
1727
1728         if (nft_base_chain_netdev(family, ops->hooknum)) {
1729                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1730                 list_for_each_entry(hook, &basechain->hook_list, list) {
1731                         if (!first)
1732                                 first = hook;
1733
1734                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1735                                            hook->ops.dev->name))
1736                                 goto nla_put_failure;
1737                         n++;
1738                 }
1739                 nla_nest_end(skb, nest_devs);
1740
1741                 if (n == 1 &&
1742                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1743                         goto nla_put_failure;
1744         }
1745         nla_nest_end(skb, nest);
1746
1747         return 0;
1748 nla_put_failure:
1749         return -1;
1750 }
1751
1752 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1753                                      u32 portid, u32 seq, int event, u32 flags,
1754                                      int family, const struct nft_table *table,
1755                                      const struct nft_chain *chain)
1756 {
1757         struct nlmsghdr *nlh;
1758
1759         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1760         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1761                            NFNETLINK_V0, nft_base_seq(net));
1762         if (!nlh)
1763                 goto nla_put_failure;
1764
1765         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1766                 goto nla_put_failure;
1767         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1768                          NFTA_CHAIN_PAD))
1769                 goto nla_put_failure;
1770         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1771                 goto nla_put_failure;
1772
1773         if (nft_is_base_chain(chain)) {
1774                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1775                 struct nft_stats __percpu *stats;
1776
1777                 if (nft_dump_basechain_hook(skb, family, basechain))
1778                         goto nla_put_failure;
1779
1780                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1781                                  htonl(basechain->policy)))
1782                         goto nla_put_failure;
1783
1784                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1785                         goto nla_put_failure;
1786
1787                 stats = rcu_dereference_check(basechain->stats,
1788                                               lockdep_commit_lock_is_held(net));
1789                 if (nft_dump_stats(skb, stats))
1790                         goto nla_put_failure;
1791         }
1792
1793         if (chain->flags &&
1794             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1795                 goto nla_put_failure;
1796
1797         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1798                 goto nla_put_failure;
1799
1800         if (chain->udata &&
1801             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1802                 goto nla_put_failure;
1803
1804         nlmsg_end(skb, nlh);
1805         return 0;
1806
1807 nla_put_failure:
1808         nlmsg_trim(skb, nlh);
1809         return -1;
1810 }
1811
1812 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1813 {
1814         struct nftables_pernet *nft_net;
1815         struct sk_buff *skb;
1816         u16 flags = 0;
1817         int err;
1818
1819         if (!ctx->report &&
1820             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1821                 return;
1822
1823         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1824         if (skb == NULL)
1825                 goto err;
1826
1827         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1828                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1829
1830         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1831                                         event, flags, ctx->family, ctx->table,
1832                                         ctx->chain);
1833         if (err < 0) {
1834                 kfree_skb(skb);
1835                 goto err;
1836         }
1837
1838         nft_net = nft_pernet(ctx->net);
1839         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1840         return;
1841 err:
1842         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1843 }
1844
1845 static int nf_tables_dump_chains(struct sk_buff *skb,
1846                                  struct netlink_callback *cb)
1847 {
1848         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1849         unsigned int idx = 0, s_idx = cb->args[0];
1850         struct net *net = sock_net(skb->sk);
1851         int family = nfmsg->nfgen_family;
1852         struct nftables_pernet *nft_net;
1853         const struct nft_table *table;
1854         const struct nft_chain *chain;
1855
1856         rcu_read_lock();
1857         nft_net = nft_pernet(net);
1858         cb->seq = READ_ONCE(nft_net->base_seq);
1859
1860         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1861                 if (family != NFPROTO_UNSPEC && family != table->family)
1862                         continue;
1863
1864                 list_for_each_entry_rcu(chain, &table->chains, list) {
1865                         if (idx < s_idx)
1866                                 goto cont;
1867                         if (idx > s_idx)
1868                                 memset(&cb->args[1], 0,
1869                                        sizeof(cb->args) - sizeof(cb->args[0]));
1870                         if (!nft_is_active(net, chain))
1871                                 continue;
1872                         if (nf_tables_fill_chain_info(skb, net,
1873                                                       NETLINK_CB(cb->skb).portid,
1874                                                       cb->nlh->nlmsg_seq,
1875                                                       NFT_MSG_NEWCHAIN,
1876                                                       NLM_F_MULTI,
1877                                                       table->family, table,
1878                                                       chain) < 0)
1879                                 goto done;
1880
1881                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1882 cont:
1883                         idx++;
1884                 }
1885         }
1886 done:
1887         rcu_read_unlock();
1888         cb->args[0] = idx;
1889         return skb->len;
1890 }
1891
1892 /* called with rcu_read_lock held */
1893 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1894                               const struct nlattr * const nla[])
1895 {
1896         struct netlink_ext_ack *extack = info->extack;
1897         u8 genmask = nft_genmask_cur(info->net);
1898         u8 family = info->nfmsg->nfgen_family;
1899         const struct nft_chain *chain;
1900         struct net *net = info->net;
1901         struct nft_table *table;
1902         struct sk_buff *skb2;
1903         int err;
1904
1905         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1906                 struct netlink_dump_control c = {
1907                         .dump = nf_tables_dump_chains,
1908                         .module = THIS_MODULE,
1909                 };
1910
1911                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1912         }
1913
1914         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1915         if (IS_ERR(table)) {
1916                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1917                 return PTR_ERR(table);
1918         }
1919
1920         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1921         if (IS_ERR(chain)) {
1922                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1923                 return PTR_ERR(chain);
1924         }
1925
1926         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1927         if (!skb2)
1928                 return -ENOMEM;
1929
1930         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1931                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1932                                         0, family, table, chain);
1933         if (err < 0)
1934                 goto err_fill_chain_info;
1935
1936         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1937
1938 err_fill_chain_info:
1939         kfree_skb(skb2);
1940         return err;
1941 }
1942
1943 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1944         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1945         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1946 };
1947
1948 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1949 {
1950         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1951         struct nft_stats __percpu *newstats;
1952         struct nft_stats *stats;
1953         int err;
1954
1955         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1956                                           nft_counter_policy, NULL);
1957         if (err < 0)
1958                 return ERR_PTR(err);
1959
1960         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1961                 return ERR_PTR(-EINVAL);
1962
1963         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1964         if (newstats == NULL)
1965                 return ERR_PTR(-ENOMEM);
1966
1967         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1968          * are not exposed to userspace.
1969          */
1970         preempt_disable();
1971         stats = this_cpu_ptr(newstats);
1972         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1973         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1974         preempt_enable();
1975
1976         return newstats;
1977 }
1978
1979 static void nft_chain_stats_replace(struct nft_trans *trans)
1980 {
1981         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1982
1983         if (!nft_trans_chain_stats(trans))
1984                 return;
1985
1986         nft_trans_chain_stats(trans) =
1987                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1988                                     lockdep_commit_lock_is_held(trans->ctx.net));
1989
1990         if (!nft_trans_chain_stats(trans))
1991                 static_branch_inc(&nft_counters_enabled);
1992 }
1993
1994 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1995 {
1996         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1997         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1998
1999         if (g0 != g1)
2000                 kvfree(g1);
2001         kvfree(g0);
2002
2003         /* should be NULL either via abort or via successful commit */
2004         WARN_ON_ONCE(chain->blob_next);
2005         kvfree(chain->blob_next);
2006 }
2007
2008 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2009 {
2010         struct nft_chain *chain = ctx->chain;
2011         struct nft_hook *hook, *next;
2012
2013         if (WARN_ON(chain->use > 0))
2014                 return;
2015
2016         /* no concurrent access possible anymore */
2017         nf_tables_chain_free_chain_rules(chain);
2018
2019         if (nft_is_base_chain(chain)) {
2020                 struct nft_base_chain *basechain = nft_base_chain(chain);
2021
2022                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2023                         list_for_each_entry_safe(hook, next,
2024                                                  &basechain->hook_list, list) {
2025                                 list_del_rcu(&hook->list);
2026                                 kfree_rcu(hook, rcu);
2027                         }
2028                 }
2029                 module_put(basechain->type->owner);
2030                 if (rcu_access_pointer(basechain->stats)) {
2031                         static_branch_dec(&nft_counters_enabled);
2032                         free_percpu(rcu_dereference_raw(basechain->stats));
2033                 }
2034                 kfree(chain->name);
2035                 kfree(chain->udata);
2036                 kfree(basechain);
2037         } else {
2038                 kfree(chain->name);
2039                 kfree(chain->udata);
2040                 kfree(chain);
2041         }
2042 }
2043
2044 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2045                                               const struct nlattr *attr)
2046 {
2047         struct net_device *dev;
2048         char ifname[IFNAMSIZ];
2049         struct nft_hook *hook;
2050         int err;
2051
2052         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2053         if (!hook) {
2054                 err = -ENOMEM;
2055                 goto err_hook_alloc;
2056         }
2057
2058         nla_strscpy(ifname, attr, IFNAMSIZ);
2059         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2060          * indirectly serializing all the other holders of the commit_mutex with
2061          * the rtnl_mutex.
2062          */
2063         dev = __dev_get_by_name(net, ifname);
2064         if (!dev) {
2065                 err = -ENOENT;
2066                 goto err_hook_dev;
2067         }
2068         hook->ops.dev = dev;
2069
2070         return hook;
2071
2072 err_hook_dev:
2073         kfree(hook);
2074 err_hook_alloc:
2075         return ERR_PTR(err);
2076 }
2077
2078 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2079                                            const struct nft_hook *this)
2080 {
2081         struct nft_hook *hook;
2082
2083         list_for_each_entry(hook, hook_list, list) {
2084                 if (this->ops.dev == hook->ops.dev)
2085                         return hook;
2086         }
2087
2088         return NULL;
2089 }
2090
2091 static int nf_tables_parse_netdev_hooks(struct net *net,
2092                                         const struct nlattr *attr,
2093                                         struct list_head *hook_list)
2094 {
2095         struct nft_hook *hook, *next;
2096         const struct nlattr *tmp;
2097         int rem, n = 0, err;
2098
2099         nla_for_each_nested(tmp, attr, rem) {
2100                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2101                         err = -EINVAL;
2102                         goto err_hook;
2103                 }
2104
2105                 hook = nft_netdev_hook_alloc(net, tmp);
2106                 if (IS_ERR(hook)) {
2107                         err = PTR_ERR(hook);
2108                         goto err_hook;
2109                 }
2110                 if (nft_hook_list_find(hook_list, hook)) {
2111                         kfree(hook);
2112                         err = -EEXIST;
2113                         goto err_hook;
2114                 }
2115                 list_add_tail(&hook->list, hook_list);
2116                 n++;
2117
2118                 if (n == NFT_NETDEVICE_MAX) {
2119                         err = -EFBIG;
2120                         goto err_hook;
2121                 }
2122         }
2123
2124         return 0;
2125
2126 err_hook:
2127         list_for_each_entry_safe(hook, next, hook_list, list) {
2128                 list_del(&hook->list);
2129                 kfree(hook);
2130         }
2131         return err;
2132 }
2133
2134 struct nft_chain_hook {
2135         u32                             num;
2136         s32                             priority;
2137         const struct nft_chain_type     *type;
2138         struct list_head                list;
2139 };
2140
2141 static int nft_chain_parse_netdev(struct net *net,
2142                                   struct nlattr *tb[],
2143                                   struct list_head *hook_list)
2144 {
2145         struct nft_hook *hook;
2146         int err;
2147
2148         if (tb[NFTA_HOOK_DEV]) {
2149                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2150                 if (IS_ERR(hook))
2151                         return PTR_ERR(hook);
2152
2153                 list_add_tail(&hook->list, hook_list);
2154         } else if (tb[NFTA_HOOK_DEVS]) {
2155                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2156                                                    hook_list);
2157                 if (err < 0)
2158                         return err;
2159
2160                 if (list_empty(hook_list))
2161                         return -EINVAL;
2162         } else {
2163                 return -EINVAL;
2164         }
2165
2166         return 0;
2167 }
2168
2169 static int nft_chain_parse_hook(struct net *net,
2170                                 const struct nlattr * const nla[],
2171                                 struct nft_chain_hook *hook, u8 family,
2172                                 struct netlink_ext_ack *extack, bool autoload)
2173 {
2174         struct nftables_pernet *nft_net = nft_pernet(net);
2175         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2176         const struct nft_chain_type *type;
2177         int err;
2178
2179         lockdep_assert_held(&nft_net->commit_mutex);
2180         lockdep_nfnl_nft_mutex_not_held();
2181
2182         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2183                                           nla[NFTA_CHAIN_HOOK],
2184                                           nft_hook_policy, NULL);
2185         if (err < 0)
2186                 return err;
2187
2188         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
2189             ha[NFTA_HOOK_PRIORITY] == NULL)
2190                 return -EINVAL;
2191
2192         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2193         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2194
2195         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2196         if (!type)
2197                 return -EOPNOTSUPP;
2198
2199         if (nla[NFTA_CHAIN_TYPE]) {
2200                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2201                                                    family, autoload);
2202                 if (IS_ERR(type)) {
2203                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2204                         return PTR_ERR(type);
2205                 }
2206         }
2207         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2208                 return -EOPNOTSUPP;
2209
2210         if (type->type == NFT_CHAIN_T_NAT &&
2211             hook->priority <= NF_IP_PRI_CONNTRACK)
2212                 return -EOPNOTSUPP;
2213
2214         if (!try_module_get(type->owner)) {
2215                 if (nla[NFTA_CHAIN_TYPE])
2216                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2217                 return -ENOENT;
2218         }
2219
2220         hook->type = type;
2221
2222         INIT_LIST_HEAD(&hook->list);
2223         if (nft_base_chain_netdev(family, hook->num)) {
2224                 err = nft_chain_parse_netdev(net, ha, &hook->list);
2225                 if (err < 0) {
2226                         module_put(type->owner);
2227                         return err;
2228                 }
2229         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2230                 module_put(type->owner);
2231                 return -EOPNOTSUPP;
2232         }
2233
2234         return 0;
2235 }
2236
2237 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2238 {
2239         struct nft_hook *h, *next;
2240
2241         list_for_each_entry_safe(h, next, &hook->list, list) {
2242                 list_del(&h->list);
2243                 kfree(h);
2244         }
2245         module_put(hook->type->owner);
2246 }
2247
2248 struct nft_rules_old {
2249         struct rcu_head h;
2250         struct nft_rule_blob *blob;
2251 };
2252
2253 static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr)
2254 {
2255         struct nft_rule_dp *prule;
2256
2257         prule = (struct nft_rule_dp *)ptr;
2258         prule->is_last = 1;
2259         /* blob size does not include the trailer rule */
2260 }
2261
2262 static struct nft_rule_blob *nf_tables_chain_alloc_rules(unsigned int size)
2263 {
2264         struct nft_rule_blob *blob;
2265
2266         /* size must include room for the last rule */
2267         if (size < offsetof(struct nft_rule_dp, data))
2268                 return NULL;
2269
2270         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rules_old);
2271         if (size > INT_MAX)
2272                 return NULL;
2273
2274         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2275         if (!blob)
2276                 return NULL;
2277
2278         blob->size = 0;
2279         nft_last_rule(blob, blob->data);
2280
2281         return blob;
2282 }
2283
2284 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2285                                     const struct nft_chain_hook *hook,
2286                                     struct nft_chain *chain)
2287 {
2288         ops->pf                 = family;
2289         ops->hooknum            = hook->num;
2290         ops->priority           = hook->priority;
2291         ops->priv               = chain;
2292         ops->hook               = hook->type->hooks[ops->hooknum];
2293         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2294 }
2295
2296 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2297                               struct nft_chain_hook *hook, u32 flags)
2298 {
2299         struct nft_chain *chain;
2300         struct nft_hook *h;
2301
2302         basechain->type = hook->type;
2303         INIT_LIST_HEAD(&basechain->hook_list);
2304         chain = &basechain->chain;
2305
2306         if (nft_base_chain_netdev(family, hook->num)) {
2307                 list_splice_init(&hook->list, &basechain->hook_list);
2308                 list_for_each_entry(h, &basechain->hook_list, list)
2309                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2310
2311                 basechain->ops.hooknum  = hook->num;
2312                 basechain->ops.priority = hook->priority;
2313         } else {
2314                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2315         }
2316
2317         chain->flags |= NFT_CHAIN_BASE | flags;
2318         basechain->policy = NF_ACCEPT;
2319         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2320             !nft_chain_offload_support(basechain)) {
2321                 list_splice_init(&basechain->hook_list, &hook->list);
2322                 return -EOPNOTSUPP;
2323         }
2324
2325         flow_block_init(&basechain->flow_block);
2326
2327         return 0;
2328 }
2329
2330 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2331 {
2332         int err;
2333
2334         err = rhltable_insert_key(&table->chains_ht, chain->name,
2335                                   &chain->rhlhead, nft_chain_ht_params);
2336         if (err)
2337                 return err;
2338
2339         list_add_tail_rcu(&chain->list, &table->chains);
2340
2341         return 0;
2342 }
2343
2344 static u64 chain_id;
2345
2346 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2347                               u8 policy, u32 flags,
2348                               struct netlink_ext_ack *extack)
2349 {
2350         const struct nlattr * const *nla = ctx->nla;
2351         struct nft_table *table = ctx->table;
2352         struct nft_base_chain *basechain;
2353         struct net *net = ctx->net;
2354         char name[NFT_NAME_MAXLEN];
2355         struct nft_rule_blob *blob;
2356         struct nft_trans *trans;
2357         struct nft_chain *chain;
2358         unsigned int data_size;
2359         int err;
2360
2361         if (table->use == UINT_MAX)
2362                 return -EOVERFLOW;
2363
2364         if (nla[NFTA_CHAIN_HOOK]) {
2365                 struct nft_stats __percpu *stats = NULL;
2366                 struct nft_chain_hook hook;
2367
2368                 if (flags & NFT_CHAIN_BINDING)
2369                         return -EOPNOTSUPP;
2370
2371                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2372                                            true);
2373                 if (err < 0)
2374                         return err;
2375
2376                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2377                 if (basechain == NULL) {
2378                         nft_chain_release_hook(&hook);
2379                         return -ENOMEM;
2380                 }
2381                 chain = &basechain->chain;
2382
2383                 if (nla[NFTA_CHAIN_COUNTERS]) {
2384                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2385                         if (IS_ERR(stats)) {
2386                                 nft_chain_release_hook(&hook);
2387                                 kfree(basechain);
2388                                 return PTR_ERR(stats);
2389                         }
2390                         rcu_assign_pointer(basechain->stats, stats);
2391                 }
2392
2393                 err = nft_basechain_init(basechain, family, &hook, flags);
2394                 if (err < 0) {
2395                         nft_chain_release_hook(&hook);
2396                         kfree(basechain);
2397                         free_percpu(stats);
2398                         return err;
2399                 }
2400                 if (stats)
2401                         static_branch_inc(&nft_counters_enabled);
2402         } else {
2403                 if (flags & NFT_CHAIN_BASE)
2404                         return -EINVAL;
2405                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2406                         return -EOPNOTSUPP;
2407
2408                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2409                 if (chain == NULL)
2410                         return -ENOMEM;
2411
2412                 chain->flags = flags;
2413         }
2414         ctx->chain = chain;
2415
2416         INIT_LIST_HEAD(&chain->rules);
2417         chain->handle = nf_tables_alloc_handle(table);
2418         chain->table = table;
2419
2420         if (nla[NFTA_CHAIN_NAME]) {
2421                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2422         } else {
2423                 if (!(flags & NFT_CHAIN_BINDING)) {
2424                         err = -EINVAL;
2425                         goto err_destroy_chain;
2426                 }
2427
2428                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2429                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2430         }
2431
2432         if (!chain->name) {
2433                 err = -ENOMEM;
2434                 goto err_destroy_chain;
2435         }
2436
2437         if (nla[NFTA_CHAIN_USERDATA]) {
2438                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2439                 if (chain->udata == NULL) {
2440                         err = -ENOMEM;
2441                         goto err_destroy_chain;
2442                 }
2443                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2444         }
2445
2446         data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2447         blob = nf_tables_chain_alloc_rules(data_size);
2448         if (!blob) {
2449                 err = -ENOMEM;
2450                 goto err_destroy_chain;
2451         }
2452
2453         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2454         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2455
2456         err = nf_tables_register_hook(net, table, chain);
2457         if (err < 0)
2458                 goto err_destroy_chain;
2459
2460         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2461         if (IS_ERR(trans)) {
2462                 err = PTR_ERR(trans);
2463                 goto err_unregister_hook;
2464         }
2465
2466         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2467         if (nft_is_base_chain(chain))
2468                 nft_trans_chain_policy(trans) = policy;
2469
2470         err = nft_chain_add(table, chain);
2471         if (err < 0) {
2472                 nft_trans_destroy(trans);
2473                 goto err_unregister_hook;
2474         }
2475
2476         table->use++;
2477
2478         return 0;
2479 err_unregister_hook:
2480         nf_tables_unregister_hook(net, table, chain);
2481 err_destroy_chain:
2482         nf_tables_chain_destroy(ctx);
2483
2484         return err;
2485 }
2486
2487 static bool nft_hook_list_equal(struct list_head *hook_list1,
2488                                 struct list_head *hook_list2)
2489 {
2490         struct nft_hook *hook;
2491         int n = 0, m = 0;
2492
2493         n = 0;
2494         list_for_each_entry(hook, hook_list2, list) {
2495                 if (!nft_hook_list_find(hook_list1, hook))
2496                         return false;
2497
2498                 n++;
2499         }
2500         list_for_each_entry(hook, hook_list1, list)
2501                 m++;
2502
2503         return n == m;
2504 }
2505
2506 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2507                               u32 flags, const struct nlattr *attr,
2508                               struct netlink_ext_ack *extack)
2509 {
2510         const struct nlattr * const *nla = ctx->nla;
2511         struct nft_table *table = ctx->table;
2512         struct nft_chain *chain = ctx->chain;
2513         struct nft_base_chain *basechain;
2514         struct nft_stats *stats = NULL;
2515         struct nft_chain_hook hook;
2516         struct nf_hook_ops *ops;
2517         struct nft_trans *trans;
2518         int err;
2519
2520         if (chain->flags ^ flags)
2521                 return -EOPNOTSUPP;
2522
2523         if (nla[NFTA_CHAIN_HOOK]) {
2524                 if (!nft_is_base_chain(chain)) {
2525                         NL_SET_BAD_ATTR(extack, attr);
2526                         return -EEXIST;
2527                 }
2528                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2529                                            extack, false);
2530                 if (err < 0)
2531                         return err;
2532
2533                 basechain = nft_base_chain(chain);
2534                 if (basechain->type != hook.type) {
2535                         nft_chain_release_hook(&hook);
2536                         NL_SET_BAD_ATTR(extack, attr);
2537                         return -EEXIST;
2538                 }
2539
2540                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2541                         if (!nft_hook_list_equal(&basechain->hook_list,
2542                                                  &hook.list)) {
2543                                 nft_chain_release_hook(&hook);
2544                                 NL_SET_BAD_ATTR(extack, attr);
2545                                 return -EEXIST;
2546                         }
2547                 } else {
2548                         ops = &basechain->ops;
2549                         if (ops->hooknum != hook.num ||
2550                             ops->priority != hook.priority) {
2551                                 nft_chain_release_hook(&hook);
2552                                 NL_SET_BAD_ATTR(extack, attr);
2553                                 return -EEXIST;
2554                         }
2555                 }
2556                 nft_chain_release_hook(&hook);
2557         }
2558
2559         if (nla[NFTA_CHAIN_HANDLE] &&
2560             nla[NFTA_CHAIN_NAME]) {
2561                 struct nft_chain *chain2;
2562
2563                 chain2 = nft_chain_lookup(ctx->net, table,
2564                                           nla[NFTA_CHAIN_NAME], genmask);
2565                 if (!IS_ERR(chain2)) {
2566                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2567                         return -EEXIST;
2568                 }
2569         }
2570
2571         if (nla[NFTA_CHAIN_COUNTERS]) {
2572                 if (!nft_is_base_chain(chain))
2573                         return -EOPNOTSUPP;
2574
2575                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2576                 if (IS_ERR(stats))
2577                         return PTR_ERR(stats);
2578         }
2579
2580         err = -ENOMEM;
2581         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2582                                 sizeof(struct nft_trans_chain));
2583         if (trans == NULL)
2584                 goto err;
2585
2586         nft_trans_chain_stats(trans) = stats;
2587         nft_trans_chain_update(trans) = true;
2588
2589         if (nla[NFTA_CHAIN_POLICY])
2590                 nft_trans_chain_policy(trans) = policy;
2591         else
2592                 nft_trans_chain_policy(trans) = -1;
2593
2594         if (nla[NFTA_CHAIN_HANDLE] &&
2595             nla[NFTA_CHAIN_NAME]) {
2596                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2597                 struct nft_trans *tmp;
2598                 char *name;
2599
2600                 err = -ENOMEM;
2601                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2602                 if (!name)
2603                         goto err;
2604
2605                 err = -EEXIST;
2606                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2607                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2608                             tmp->ctx.table == table &&
2609                             nft_trans_chain_update(tmp) &&
2610                             nft_trans_chain_name(tmp) &&
2611                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2612                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2613                                 kfree(name);
2614                                 goto err;
2615                         }
2616                 }
2617
2618                 nft_trans_chain_name(trans) = name;
2619         }
2620         nft_trans_commit_list_add_tail(ctx->net, trans);
2621
2622         return 0;
2623 err:
2624         free_percpu(stats);
2625         kfree(trans);
2626         return err;
2627 }
2628
2629 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2630                                                const struct nft_table *table,
2631                                                const struct nlattr *nla)
2632 {
2633         struct nftables_pernet *nft_net = nft_pernet(net);
2634         u32 id = ntohl(nla_get_be32(nla));
2635         struct nft_trans *trans;
2636
2637         list_for_each_entry(trans, &nft_net->commit_list, list) {
2638                 struct nft_chain *chain = trans->ctx.chain;
2639
2640                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2641                     chain->table == table &&
2642                     id == nft_trans_chain_id(trans))
2643                         return chain;
2644         }
2645         return ERR_PTR(-ENOENT);
2646 }
2647
2648 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2649                               const struct nlattr * const nla[])
2650 {
2651         struct nftables_pernet *nft_net = nft_pernet(info->net);
2652         struct netlink_ext_ack *extack = info->extack;
2653         u8 genmask = nft_genmask_next(info->net);
2654         u8 family = info->nfmsg->nfgen_family;
2655         struct nft_chain *chain = NULL;
2656         struct net *net = info->net;
2657         const struct nlattr *attr;
2658         struct nft_table *table;
2659         u8 policy = NF_ACCEPT;
2660         struct nft_ctx ctx;
2661         u64 handle = 0;
2662         u32 flags = 0;
2663
2664         lockdep_assert_held(&nft_net->commit_mutex);
2665
2666         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2667                                  NETLINK_CB(skb).portid);
2668         if (IS_ERR(table)) {
2669                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2670                 return PTR_ERR(table);
2671         }
2672
2673         chain = NULL;
2674         attr = nla[NFTA_CHAIN_NAME];
2675
2676         if (nla[NFTA_CHAIN_HANDLE]) {
2677                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2678                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2679                 if (IS_ERR(chain)) {
2680                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2681                         return PTR_ERR(chain);
2682                 }
2683                 attr = nla[NFTA_CHAIN_HANDLE];
2684         } else if (nla[NFTA_CHAIN_NAME]) {
2685                 chain = nft_chain_lookup(net, table, attr, genmask);
2686                 if (IS_ERR(chain)) {
2687                         if (PTR_ERR(chain) != -ENOENT) {
2688                                 NL_SET_BAD_ATTR(extack, attr);
2689                                 return PTR_ERR(chain);
2690                         }
2691                         chain = NULL;
2692                 }
2693         } else if (!nla[NFTA_CHAIN_ID]) {
2694                 return -EINVAL;
2695         }
2696
2697         if (nla[NFTA_CHAIN_POLICY]) {
2698                 if (chain != NULL &&
2699                     !nft_is_base_chain(chain)) {
2700                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2701                         return -EOPNOTSUPP;
2702                 }
2703
2704                 if (chain == NULL &&
2705                     nla[NFTA_CHAIN_HOOK] == NULL) {
2706                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2707                         return -EOPNOTSUPP;
2708                 }
2709
2710                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2711                 switch (policy) {
2712                 case NF_DROP:
2713                 case NF_ACCEPT:
2714                         break;
2715                 default:
2716                         return -EINVAL;
2717                 }
2718         }
2719
2720         if (nla[NFTA_CHAIN_FLAGS])
2721                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2722         else if (chain)
2723                 flags = chain->flags;
2724
2725         if (flags & ~NFT_CHAIN_FLAGS)
2726                 return -EOPNOTSUPP;
2727
2728         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2729
2730         if (chain != NULL) {
2731                 if (chain->flags & NFT_CHAIN_BINDING)
2732                         return -EINVAL;
2733
2734                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2735                         NL_SET_BAD_ATTR(extack, attr);
2736                         return -EEXIST;
2737                 }
2738                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2739                         return -EOPNOTSUPP;
2740
2741                 flags |= chain->flags & NFT_CHAIN_BASE;
2742                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2743                                           extack);
2744         }
2745
2746         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2747 }
2748
2749 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2750                               const struct nlattr * const nla[])
2751 {
2752         struct netlink_ext_ack *extack = info->extack;
2753         u8 genmask = nft_genmask_next(info->net);
2754         u8 family = info->nfmsg->nfgen_family;
2755         struct net *net = info->net;
2756         const struct nlattr *attr;
2757         struct nft_table *table;
2758         struct nft_chain *chain;
2759         struct nft_rule *rule;
2760         struct nft_ctx ctx;
2761         u64 handle;
2762         u32 use;
2763         int err;
2764
2765         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2766                                  NETLINK_CB(skb).portid);
2767         if (IS_ERR(table)) {
2768                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2769                 return PTR_ERR(table);
2770         }
2771
2772         if (nla[NFTA_CHAIN_HANDLE]) {
2773                 attr = nla[NFTA_CHAIN_HANDLE];
2774                 handle = be64_to_cpu(nla_get_be64(attr));
2775                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2776         } else {
2777                 attr = nla[NFTA_CHAIN_NAME];
2778                 chain = nft_chain_lookup(net, table, attr, genmask);
2779         }
2780         if (IS_ERR(chain)) {
2781                 NL_SET_BAD_ATTR(extack, attr);
2782                 return PTR_ERR(chain);
2783         }
2784
2785         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2786             chain->use > 0)
2787                 return -EBUSY;
2788
2789         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2790
2791         use = chain->use;
2792         list_for_each_entry(rule, &chain->rules, list) {
2793                 if (!nft_is_active_next(net, rule))
2794                         continue;
2795                 use--;
2796
2797                 err = nft_delrule(&ctx, rule);
2798                 if (err < 0)
2799                         return err;
2800         }
2801
2802         /* There are rules and elements that are still holding references to us,
2803          * we cannot do a recursive removal in this case.
2804          */
2805         if (use > 0) {
2806                 NL_SET_BAD_ATTR(extack, attr);
2807                 return -EBUSY;
2808         }
2809
2810         return nft_delchain(&ctx);
2811 }
2812
2813 /*
2814  * Expressions
2815  */
2816
2817 /**
2818  *      nft_register_expr - register nf_tables expr type
2819  *      @type: expr type
2820  *
2821  *      Registers the expr type for use with nf_tables. Returns zero on
2822  *      success or a negative errno code otherwise.
2823  */
2824 int nft_register_expr(struct nft_expr_type *type)
2825 {
2826         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2827         if (type->family == NFPROTO_UNSPEC)
2828                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2829         else
2830                 list_add_rcu(&type->list, &nf_tables_expressions);
2831         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2832         return 0;
2833 }
2834 EXPORT_SYMBOL_GPL(nft_register_expr);
2835
2836 /**
2837  *      nft_unregister_expr - unregister nf_tables expr type
2838  *      @type: expr type
2839  *
2840  *      Unregisters the expr typefor use with nf_tables.
2841  */
2842 void nft_unregister_expr(struct nft_expr_type *type)
2843 {
2844         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2845         list_del_rcu(&type->list);
2846         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2847 }
2848 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2849
2850 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2851                                                        struct nlattr *nla)
2852 {
2853         const struct nft_expr_type *type, *candidate = NULL;
2854
2855         list_for_each_entry(type, &nf_tables_expressions, list) {
2856                 if (!nla_strcmp(nla, type->name)) {
2857                         if (!type->family && !candidate)
2858                                 candidate = type;
2859                         else if (type->family == family)
2860                                 candidate = type;
2861                 }
2862         }
2863         return candidate;
2864 }
2865
2866 #ifdef CONFIG_MODULES
2867 static int nft_expr_type_request_module(struct net *net, u8 family,
2868                                         struct nlattr *nla)
2869 {
2870         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2871                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2872                 return -EAGAIN;
2873
2874         return 0;
2875 }
2876 #endif
2877
2878 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2879                                                      u8 family,
2880                                                      struct nlattr *nla)
2881 {
2882         const struct nft_expr_type *type;
2883
2884         if (nla == NULL)
2885                 return ERR_PTR(-EINVAL);
2886
2887         type = __nft_expr_type_get(family, nla);
2888         if (type != NULL && try_module_get(type->owner))
2889                 return type;
2890
2891         lockdep_nfnl_nft_mutex_not_held();
2892 #ifdef CONFIG_MODULES
2893         if (type == NULL) {
2894                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2895                         return ERR_PTR(-EAGAIN);
2896
2897                 if (nft_request_module(net, "nft-expr-%.*s",
2898                                        nla_len(nla),
2899                                        (char *)nla_data(nla)) == -EAGAIN)
2900                         return ERR_PTR(-EAGAIN);
2901         }
2902 #endif
2903         return ERR_PTR(-ENOENT);
2904 }
2905
2906 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2907         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2908                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2909         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2910 };
2911
2912 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2913                                     const struct nft_expr *expr)
2914 {
2915         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2916                 goto nla_put_failure;
2917
2918         if (expr->ops->dump) {
2919                 struct nlattr *data = nla_nest_start_noflag(skb,
2920                                                             NFTA_EXPR_DATA);
2921                 if (data == NULL)
2922                         goto nla_put_failure;
2923                 if (expr->ops->dump(skb, expr) < 0)
2924                         goto nla_put_failure;
2925                 nla_nest_end(skb, data);
2926         }
2927
2928         return skb->len;
2929
2930 nla_put_failure:
2931         return -1;
2932 };
2933
2934 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2935                   const struct nft_expr *expr)
2936 {
2937         struct nlattr *nest;
2938
2939         nest = nla_nest_start_noflag(skb, attr);
2940         if (!nest)
2941                 goto nla_put_failure;
2942         if (nf_tables_fill_expr_info(skb, expr) < 0)
2943                 goto nla_put_failure;
2944         nla_nest_end(skb, nest);
2945         return 0;
2946
2947 nla_put_failure:
2948         return -1;
2949 }
2950
2951 struct nft_expr_info {
2952         const struct nft_expr_ops       *ops;
2953         const struct nlattr             *attr;
2954         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2955 };
2956
2957 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2958                                 const struct nlattr *nla,
2959                                 struct nft_expr_info *info)
2960 {
2961         const struct nft_expr_type *type;
2962         const struct nft_expr_ops *ops;
2963         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2964         int err;
2965
2966         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2967                                           nft_expr_policy, NULL);
2968         if (err < 0)
2969                 return err;
2970
2971         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2972         if (IS_ERR(type))
2973                 return PTR_ERR(type);
2974
2975         if (tb[NFTA_EXPR_DATA]) {
2976                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2977                                                   tb[NFTA_EXPR_DATA],
2978                                                   type->policy, NULL);
2979                 if (err < 0)
2980                         goto err1;
2981         } else
2982                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2983
2984         if (type->select_ops != NULL) {
2985                 ops = type->select_ops(ctx,
2986                                        (const struct nlattr * const *)info->tb);
2987                 if (IS_ERR(ops)) {
2988                         err = PTR_ERR(ops);
2989 #ifdef CONFIG_MODULES
2990                         if (err == -EAGAIN)
2991                                 if (nft_expr_type_request_module(ctx->net,
2992                                                                  ctx->family,
2993                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2994                                         err = -ENOENT;
2995 #endif
2996                         goto err1;
2997                 }
2998         } else
2999                 ops = type->ops;
3000
3001         info->attr = nla;
3002         info->ops = ops;
3003
3004         return 0;
3005
3006 err1:
3007         module_put(type->owner);
3008         return err;
3009 }
3010
3011 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3012                              const struct nft_expr_info *expr_info,
3013                              struct nft_expr *expr)
3014 {
3015         const struct nft_expr_ops *ops = expr_info->ops;
3016         int err;
3017
3018         expr->ops = ops;
3019         if (ops->init) {
3020                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3021                 if (err < 0)
3022                         goto err1;
3023         }
3024
3025         return 0;
3026 err1:
3027         expr->ops = NULL;
3028         return err;
3029 }
3030
3031 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3032                                    struct nft_expr *expr)
3033 {
3034         const struct nft_expr_type *type = expr->ops->type;
3035
3036         if (expr->ops->destroy)
3037                 expr->ops->destroy(ctx, expr);
3038         module_put(type->owner);
3039 }
3040
3041 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3042                                       const struct nlattr *nla)
3043 {
3044         struct nft_expr_info expr_info;
3045         struct nft_expr *expr;
3046         struct module *owner;
3047         int err;
3048
3049         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3050         if (err < 0)
3051                 goto err_expr_parse;
3052
3053         err = -EOPNOTSUPP;
3054         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3055                 goto err_expr_stateful;
3056
3057         err = -ENOMEM;
3058         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3059         if (expr == NULL)
3060                 goto err_expr_stateful;
3061
3062         err = nf_tables_newexpr(ctx, &expr_info, expr);
3063         if (err < 0)
3064                 goto err_expr_new;
3065
3066         return expr;
3067 err_expr_new:
3068         kfree(expr);
3069 err_expr_stateful:
3070         owner = expr_info.ops->type->owner;
3071         if (expr_info.ops->type->release_ops)
3072                 expr_info.ops->type->release_ops(expr_info.ops);
3073
3074         module_put(owner);
3075 err_expr_parse:
3076         return ERR_PTR(err);
3077 }
3078
3079 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3080 {
3081         int err;
3082
3083         if (src->ops->clone) {
3084                 dst->ops = src->ops;
3085                 err = src->ops->clone(dst, src);
3086                 if (err < 0)
3087                         return err;
3088         } else {
3089                 memcpy(dst, src, src->ops->size);
3090         }
3091
3092         __module_get(src->ops->type->owner);
3093
3094         return 0;
3095 }
3096
3097 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3098 {
3099         nf_tables_expr_destroy(ctx, expr);
3100         kfree(expr);
3101 }
3102
3103 /*
3104  * Rules
3105  */
3106
3107 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3108                                           u64 handle)
3109 {
3110         struct nft_rule *rule;
3111
3112         // FIXME: this sucks
3113         list_for_each_entry_rcu(rule, &chain->rules, list) {
3114                 if (handle == rule->handle)
3115                         return rule;
3116         }
3117
3118         return ERR_PTR(-ENOENT);
3119 }
3120
3121 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3122                                         const struct nlattr *nla)
3123 {
3124         if (nla == NULL)
3125                 return ERR_PTR(-EINVAL);
3126
3127         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3128 }
3129
3130 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3131         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3132                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3133         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3134                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3135         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3136         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3137         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3138         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3139         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3140                                     .len = NFT_USERDATA_MAXLEN },
3141         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3142         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3143         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3144 };
3145
3146 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3147                                     u32 portid, u32 seq, int event,
3148                                     u32 flags, int family,
3149                                     const struct nft_table *table,
3150                                     const struct nft_chain *chain,
3151                                     const struct nft_rule *rule, u64 handle)
3152 {
3153         struct nlmsghdr *nlh;
3154         const struct nft_expr *expr, *next;
3155         struct nlattr *list;
3156         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3157
3158         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3159                            nft_base_seq(net));
3160         if (!nlh)
3161                 goto nla_put_failure;
3162
3163         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3164                 goto nla_put_failure;
3165         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3166                 goto nla_put_failure;
3167         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3168                          NFTA_RULE_PAD))
3169                 goto nla_put_failure;
3170
3171         if (event != NFT_MSG_DELRULE && handle) {
3172                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3173                                  NFTA_RULE_PAD))
3174                         goto nla_put_failure;
3175         }
3176
3177         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3178                 nft_flow_rule_stats(chain, rule);
3179
3180         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3181         if (list == NULL)
3182                 goto nla_put_failure;
3183         nft_rule_for_each_expr(expr, next, rule) {
3184                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
3185                         goto nla_put_failure;
3186         }
3187         nla_nest_end(skb, list);
3188
3189         if (rule->udata) {
3190                 struct nft_userdata *udata = nft_userdata(rule);
3191                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3192                             udata->data) < 0)
3193                         goto nla_put_failure;
3194         }
3195
3196         nlmsg_end(skb, nlh);
3197         return 0;
3198
3199 nla_put_failure:
3200         nlmsg_trim(skb, nlh);
3201         return -1;
3202 }
3203
3204 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3205                                   const struct nft_rule *rule, int event)
3206 {
3207         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3208         const struct nft_rule *prule;
3209         struct sk_buff *skb;
3210         u64 handle = 0;
3211         u16 flags = 0;
3212         int err;
3213
3214         if (!ctx->report &&
3215             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3216                 return;
3217
3218         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3219         if (skb == NULL)
3220                 goto err;
3221
3222         if (event == NFT_MSG_NEWRULE &&
3223             !list_is_first(&rule->list, &ctx->chain->rules) &&
3224             !list_is_last(&rule->list, &ctx->chain->rules)) {
3225                 prule = list_prev_entry(rule, list);
3226                 handle = prule->handle;
3227         }
3228         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3229                 flags |= NLM_F_APPEND;
3230         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3231                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3232
3233         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3234                                        event, flags, ctx->family, ctx->table,
3235                                        ctx->chain, rule, handle);
3236         if (err < 0) {
3237                 kfree_skb(skb);
3238                 goto err;
3239         }
3240
3241         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3242         return;
3243 err:
3244         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3245 }
3246
3247 struct nft_rule_dump_ctx {
3248         char *table;
3249         char *chain;
3250 };
3251
3252 static int __nf_tables_dump_rules(struct sk_buff *skb,
3253                                   unsigned int *idx,
3254                                   struct netlink_callback *cb,
3255                                   const struct nft_table *table,
3256                                   const struct nft_chain *chain)
3257 {
3258         struct net *net = sock_net(skb->sk);
3259         const struct nft_rule *rule, *prule;
3260         unsigned int s_idx = cb->args[0];
3261         u64 handle;
3262
3263         prule = NULL;
3264         list_for_each_entry_rcu(rule, &chain->rules, list) {
3265                 if (!nft_is_active(net, rule))
3266                         goto cont_skip;
3267                 if (*idx < s_idx)
3268                         goto cont;
3269                 if (*idx > s_idx) {
3270                         memset(&cb->args[1], 0,
3271                                         sizeof(cb->args) - sizeof(cb->args[0]));
3272                 }
3273                 if (prule)
3274                         handle = prule->handle;
3275                 else
3276                         handle = 0;
3277
3278                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3279                                         cb->nlh->nlmsg_seq,
3280                                         NFT_MSG_NEWRULE,
3281                                         NLM_F_MULTI | NLM_F_APPEND,
3282                                         table->family,
3283                                         table, chain, rule, handle) < 0)
3284                         return 1;
3285
3286                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3287 cont:
3288                 prule = rule;
3289 cont_skip:
3290                 (*idx)++;
3291         }
3292         return 0;
3293 }
3294
3295 static int nf_tables_dump_rules(struct sk_buff *skb,
3296                                 struct netlink_callback *cb)
3297 {
3298         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3299         const struct nft_rule_dump_ctx *ctx = cb->data;
3300         struct nft_table *table;
3301         const struct nft_chain *chain;
3302         unsigned int idx = 0;
3303         struct net *net = sock_net(skb->sk);
3304         int family = nfmsg->nfgen_family;
3305         struct nftables_pernet *nft_net;
3306
3307         rcu_read_lock();
3308         nft_net = nft_pernet(net);
3309         cb->seq = READ_ONCE(nft_net->base_seq);
3310
3311         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3312                 if (family != NFPROTO_UNSPEC && family != table->family)
3313                         continue;
3314
3315                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3316                         continue;
3317
3318                 if (ctx && ctx->table && ctx->chain) {
3319                         struct rhlist_head *list, *tmp;
3320
3321                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3322                                                nft_chain_ht_params);
3323                         if (!list)
3324                                 goto done;
3325
3326                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3327                                 if (!nft_is_active(net, chain))
3328                                         continue;
3329                                 __nf_tables_dump_rules(skb, &idx,
3330                                                        cb, table, chain);
3331                                 break;
3332                         }
3333                         goto done;
3334                 }
3335
3336                 list_for_each_entry_rcu(chain, &table->chains, list) {
3337                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3338                                 goto done;
3339                 }
3340
3341                 if (ctx && ctx->table)
3342                         break;
3343         }
3344 done:
3345         rcu_read_unlock();
3346
3347         cb->args[0] = idx;
3348         return skb->len;
3349 }
3350
3351 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3352 {
3353         const struct nlattr * const *nla = cb->data;
3354         struct nft_rule_dump_ctx *ctx = NULL;
3355
3356         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3357                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3358                 if (!ctx)
3359                         return -ENOMEM;
3360
3361                 if (nla[NFTA_RULE_TABLE]) {
3362                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3363                                                         GFP_ATOMIC);
3364                         if (!ctx->table) {
3365                                 kfree(ctx);
3366                                 return -ENOMEM;
3367                         }
3368                 }
3369                 if (nla[NFTA_RULE_CHAIN]) {
3370                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3371                                                 GFP_ATOMIC);
3372                         if (!ctx->chain) {
3373                                 kfree(ctx->table);
3374                                 kfree(ctx);
3375                                 return -ENOMEM;
3376                         }
3377                 }
3378         }
3379
3380         cb->data = ctx;
3381         return 0;
3382 }
3383
3384 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3385 {
3386         struct nft_rule_dump_ctx *ctx = cb->data;
3387
3388         if (ctx) {
3389                 kfree(ctx->table);
3390                 kfree(ctx->chain);
3391                 kfree(ctx);
3392         }
3393         return 0;
3394 }
3395
3396 /* called with rcu_read_lock held */
3397 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3398                              const struct nlattr * const nla[])
3399 {
3400         struct netlink_ext_ack *extack = info->extack;
3401         u8 genmask = nft_genmask_cur(info->net);
3402         u8 family = info->nfmsg->nfgen_family;
3403         const struct nft_chain *chain;
3404         const struct nft_rule *rule;
3405         struct net *net = info->net;
3406         struct nft_table *table;
3407         struct sk_buff *skb2;
3408         int err;
3409
3410         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3411                 struct netlink_dump_control c = {
3412                         .start= nf_tables_dump_rules_start,
3413                         .dump = nf_tables_dump_rules,
3414                         .done = nf_tables_dump_rules_done,
3415                         .module = THIS_MODULE,
3416                         .data = (void *)nla,
3417                 };
3418
3419                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3420         }
3421
3422         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3423         if (IS_ERR(table)) {
3424                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3425                 return PTR_ERR(table);
3426         }
3427
3428         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3429         if (IS_ERR(chain)) {
3430                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3431                 return PTR_ERR(chain);
3432         }
3433
3434         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3435         if (IS_ERR(rule)) {
3436                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3437                 return PTR_ERR(rule);
3438         }
3439
3440         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3441         if (!skb2)
3442                 return -ENOMEM;
3443
3444         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3445                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3446                                        family, table, chain, rule, 0);
3447         if (err < 0)
3448                 goto err_fill_rule_info;
3449
3450         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3451
3452 err_fill_rule_info:
3453         kfree_skb(skb2);
3454         return err;
3455 }
3456
3457 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3458 {
3459         struct nft_expr *expr, *next;
3460
3461         /*
3462          * Careful: some expressions might not be initialized in case this
3463          * is called on error from nf_tables_newrule().
3464          */
3465         expr = nft_expr_first(rule);
3466         while (nft_expr_more(rule, expr)) {
3467                 next = nft_expr_next(expr);
3468                 nf_tables_expr_destroy(ctx, expr);
3469                 expr = next;
3470         }
3471         kfree(rule);
3472 }
3473
3474 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3475 {
3476         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3477         nf_tables_rule_destroy(ctx, rule);
3478 }
3479
3480 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3481 {
3482         struct nft_expr *expr, *last;
3483         const struct nft_data *data;
3484         struct nft_rule *rule;
3485         int err;
3486
3487         if (ctx->level == NFT_JUMP_STACK_SIZE)
3488                 return -EMLINK;
3489
3490         list_for_each_entry(rule, &chain->rules, list) {
3491                 if (!nft_is_active_next(ctx->net, rule))
3492                         continue;
3493
3494                 nft_rule_for_each_expr(expr, last, rule) {
3495                         if (!expr->ops->validate)
3496                                 continue;
3497
3498                         err = expr->ops->validate(ctx, expr, &data);
3499                         if (err < 0)
3500                                 return err;
3501                 }
3502
3503                 cond_resched();
3504         }
3505
3506         return 0;
3507 }
3508 EXPORT_SYMBOL_GPL(nft_chain_validate);
3509
3510 static int nft_table_validate(struct net *net, const struct nft_table *table)
3511 {
3512         struct nft_chain *chain;
3513         struct nft_ctx ctx = {
3514                 .net    = net,
3515                 .family = table->family,
3516         };
3517         int err;
3518
3519         list_for_each_entry(chain, &table->chains, list) {
3520                 if (!nft_is_base_chain(chain))
3521                         continue;
3522
3523                 ctx.chain = chain;
3524                 err = nft_chain_validate(&ctx, chain);
3525                 if (err < 0)
3526                         return err;
3527         }
3528
3529         return 0;
3530 }
3531
3532 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3533                          const struct nft_set_iter *iter,
3534                          struct nft_set_elem *elem)
3535 {
3536         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3537         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3538         const struct nft_data *data;
3539         int err;
3540
3541         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3542             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3543                 return 0;
3544
3545         data = nft_set_ext_data(ext);
3546         switch (data->verdict.code) {
3547         case NFT_JUMP:
3548         case NFT_GOTO:
3549                 pctx->level++;
3550                 err = nft_chain_validate(ctx, data->verdict.chain);
3551                 if (err < 0)
3552                         return err;
3553                 pctx->level--;
3554                 break;
3555         default:
3556                 break;
3557         }
3558
3559         return 0;
3560 }
3561
3562 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3563 {
3564         u8 genmask = nft_genmask_next(ctx->net);
3565         struct nft_set_elem_catchall *catchall;
3566         struct nft_set_elem elem;
3567         struct nft_set_ext *ext;
3568         int ret = 0;
3569
3570         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3571                 ext = nft_set_elem_ext(set, catchall->elem);
3572                 if (!nft_set_elem_active(ext, genmask))
3573                         continue;
3574
3575                 elem.priv = catchall->elem;
3576                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3577                 if (ret < 0)
3578                         return ret;
3579         }
3580
3581         return ret;
3582 }
3583
3584 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3585                                              const struct nft_chain *chain,
3586                                              const struct nlattr *nla);
3587
3588 #define NFT_RULE_MAXEXPRS       128
3589
3590 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3591                              const struct nlattr * const nla[])
3592 {
3593         struct nftables_pernet *nft_net = nft_pernet(info->net);
3594         struct netlink_ext_ack *extack = info->extack;
3595         unsigned int size, i, n, ulen = 0, usize = 0;
3596         u8 genmask = nft_genmask_next(info->net);
3597         struct nft_rule *rule, *old_rule = NULL;
3598         struct nft_expr_info *expr_info = NULL;
3599         u8 family = info->nfmsg->nfgen_family;
3600         struct nft_flow_rule *flow = NULL;
3601         struct net *net = info->net;
3602         struct nft_userdata *udata;
3603         struct nft_table *table;
3604         struct nft_chain *chain;
3605         struct nft_trans *trans;
3606         u64 handle, pos_handle;
3607         struct nft_expr *expr;
3608         struct nft_ctx ctx;
3609         struct nlattr *tmp;
3610         int err, rem;
3611
3612         lockdep_assert_held(&nft_net->commit_mutex);
3613
3614         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3615                                  NETLINK_CB(skb).portid);
3616         if (IS_ERR(table)) {
3617                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3618                 return PTR_ERR(table);
3619         }
3620
3621         if (nla[NFTA_RULE_CHAIN]) {
3622                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3623                                          genmask);
3624                 if (IS_ERR(chain)) {
3625                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3626                         return PTR_ERR(chain);
3627                 }
3628                 if (nft_chain_is_bound(chain))
3629                         return -EOPNOTSUPP;
3630
3631         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3632                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3633                 if (IS_ERR(chain)) {
3634                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3635                         return PTR_ERR(chain);
3636                 }
3637         } else {
3638                 return -EINVAL;
3639         }
3640
3641         if (nla[NFTA_RULE_HANDLE]) {
3642                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3643                 rule = __nft_rule_lookup(chain, handle);
3644                 if (IS_ERR(rule)) {
3645                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3646                         return PTR_ERR(rule);
3647                 }
3648
3649                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3650                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3651                         return -EEXIST;
3652                 }
3653                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3654                         old_rule = rule;
3655                 else
3656                         return -EOPNOTSUPP;
3657         } else {
3658                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3659                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3660                         return -EINVAL;
3661                 handle = nf_tables_alloc_handle(table);
3662
3663                 if (chain->use == UINT_MAX)
3664                         return -EOVERFLOW;
3665
3666                 if (nla[NFTA_RULE_POSITION]) {
3667                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3668                         old_rule = __nft_rule_lookup(chain, pos_handle);
3669                         if (IS_ERR(old_rule)) {
3670                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3671                                 return PTR_ERR(old_rule);
3672                         }
3673                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3674                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3675                         if (IS_ERR(old_rule)) {
3676                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3677                                 return PTR_ERR(old_rule);
3678                         }
3679                 }
3680         }
3681
3682         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3683
3684         n = 0;
3685         size = 0;
3686         if (nla[NFTA_RULE_EXPRESSIONS]) {
3687                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3688                                            sizeof(struct nft_expr_info),
3689                                            GFP_KERNEL);
3690                 if (!expr_info)
3691                         return -ENOMEM;
3692
3693                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3694                         err = -EINVAL;
3695                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3696                                 goto err_release_expr;
3697                         if (n == NFT_RULE_MAXEXPRS)
3698                                 goto err_release_expr;
3699                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3700                         if (err < 0) {
3701                                 NL_SET_BAD_ATTR(extack, tmp);
3702                                 goto err_release_expr;
3703                         }
3704                         size += expr_info[n].ops->size;
3705                         n++;
3706                 }
3707         }
3708         /* Check for overflow of dlen field */
3709         err = -EFBIG;
3710         if (size >= 1 << 12)
3711                 goto err_release_expr;
3712
3713         if (nla[NFTA_RULE_USERDATA]) {
3714                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3715                 if (ulen > 0)
3716                         usize = sizeof(struct nft_userdata) + ulen;
3717         }
3718
3719         err = -ENOMEM;
3720         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3721         if (rule == NULL)
3722                 goto err_release_expr;
3723
3724         nft_activate_next(net, rule);
3725
3726         rule->handle = handle;
3727         rule->dlen   = size;
3728         rule->udata  = ulen ? 1 : 0;
3729
3730         if (ulen) {
3731                 udata = nft_userdata(rule);
3732                 udata->len = ulen - 1;
3733                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3734         }
3735
3736         expr = nft_expr_first(rule);
3737         for (i = 0; i < n; i++) {
3738                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3739                 if (err < 0) {
3740                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3741                         goto err_release_rule;
3742                 }
3743
3744                 if (expr_info[i].ops->validate)
3745                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3746
3747                 expr_info[i].ops = NULL;
3748                 expr = nft_expr_next(expr);
3749         }
3750
3751         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3752                 flow = nft_flow_rule_create(net, rule);
3753                 if (IS_ERR(flow)) {
3754                         err = PTR_ERR(flow);
3755                         goto err_release_rule;
3756                 }
3757         }
3758
3759         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3760                 err = nft_delrule(&ctx, old_rule);
3761                 if (err < 0)
3762                         goto err_destroy_flow_rule;
3763
3764                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3765                 if (trans == NULL) {
3766                         err = -ENOMEM;
3767                         goto err_destroy_flow_rule;
3768                 }
3769                 list_add_tail_rcu(&rule->list, &old_rule->list);
3770         } else {
3771                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3772                 if (!trans) {
3773                         err = -ENOMEM;
3774                         goto err_destroy_flow_rule;
3775                 }
3776
3777                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3778                         if (old_rule)
3779                                 list_add_rcu(&rule->list, &old_rule->list);
3780                         else
3781                                 list_add_tail_rcu(&rule->list, &chain->rules);
3782                  } else {
3783                         if (old_rule)
3784                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3785                         else
3786                                 list_add_rcu(&rule->list, &chain->rules);
3787                 }
3788         }
3789         kvfree(expr_info);
3790         chain->use++;
3791
3792         if (flow)
3793                 nft_trans_flow_rule(trans) = flow;
3794
3795         if (nft_net->validate_state == NFT_VALIDATE_DO)
3796                 return nft_table_validate(net, table);
3797
3798         return 0;
3799
3800 err_destroy_flow_rule:
3801         if (flow)
3802                 nft_flow_rule_destroy(flow);
3803 err_release_rule:
3804         nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
3805         nf_tables_rule_destroy(&ctx, rule);
3806 err_release_expr:
3807         for (i = 0; i < n; i++) {
3808                 if (expr_info[i].ops) {
3809                         module_put(expr_info[i].ops->type->owner);
3810                         if (expr_info[i].ops->type->release_ops)
3811                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3812                 }
3813         }
3814         kvfree(expr_info);
3815
3816         return err;
3817 }
3818
3819 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3820                                              const struct nft_chain *chain,
3821                                              const struct nlattr *nla)
3822 {
3823         struct nftables_pernet *nft_net = nft_pernet(net);
3824         u32 id = ntohl(nla_get_be32(nla));
3825         struct nft_trans *trans;
3826
3827         list_for_each_entry(trans, &nft_net->commit_list, list) {
3828                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3829                     trans->ctx.chain == chain &&
3830                     id == nft_trans_rule_id(trans))
3831                         return nft_trans_rule(trans);
3832         }
3833         return ERR_PTR(-ENOENT);
3834 }
3835
3836 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3837                              const struct nlattr * const nla[])
3838 {
3839         struct netlink_ext_ack *extack = info->extack;
3840         u8 genmask = nft_genmask_next(info->net);
3841         u8 family = info->nfmsg->nfgen_family;
3842         struct nft_chain *chain = NULL;
3843         struct net *net = info->net;
3844         struct nft_table *table;
3845         struct nft_rule *rule;
3846         struct nft_ctx ctx;
3847         int err = 0;
3848
3849         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3850                                  NETLINK_CB(skb).portid);
3851         if (IS_ERR(table)) {
3852                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3853                 return PTR_ERR(table);
3854         }
3855
3856         if (nla[NFTA_RULE_CHAIN]) {
3857                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3858                                          genmask);
3859                 if (IS_ERR(chain)) {
3860                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3861                         return PTR_ERR(chain);
3862                 }
3863                 if (nft_chain_is_bound(chain))
3864                         return -EOPNOTSUPP;
3865         }
3866
3867         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3868
3869         if (chain) {
3870                 if (nla[NFTA_RULE_HANDLE]) {
3871                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3872                         if (IS_ERR(rule)) {
3873                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3874                                 return PTR_ERR(rule);
3875                         }
3876
3877                         err = nft_delrule(&ctx, rule);
3878                 } else if (nla[NFTA_RULE_ID]) {
3879                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3880                         if (IS_ERR(rule)) {
3881                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3882                                 return PTR_ERR(rule);
3883                         }
3884
3885                         err = nft_delrule(&ctx, rule);
3886                 } else {
3887                         err = nft_delrule_by_chain(&ctx);
3888                 }
3889         } else {
3890                 list_for_each_entry(chain, &table->chains, list) {
3891                         if (!nft_is_active_next(net, chain))
3892                                 continue;
3893
3894                         ctx.chain = chain;
3895                         err = nft_delrule_by_chain(&ctx);
3896                         if (err < 0)
3897                                 break;
3898                 }
3899         }
3900
3901         return err;
3902 }
3903
3904 /*
3905  * Sets
3906  */
3907 static const struct nft_set_type *nft_set_types[] = {
3908         &nft_set_hash_fast_type,
3909         &nft_set_hash_type,
3910         &nft_set_rhash_type,
3911         &nft_set_bitmap_type,
3912         &nft_set_rbtree_type,
3913 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3914         &nft_set_pipapo_avx2_type,
3915 #endif
3916         &nft_set_pipapo_type,
3917 };
3918
3919 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3920                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3921                                  NFT_SET_EVAL)
3922
3923 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3924 {
3925         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3926 }
3927
3928 /*
3929  * Select a set implementation based on the data characteristics and the
3930  * given policy. The total memory use might not be known if no size is
3931  * given, in that case the amount of memory per element is used.
3932  */
3933 static const struct nft_set_ops *
3934 nft_select_set_ops(const struct nft_ctx *ctx,
3935                    const struct nlattr * const nla[],
3936                    const struct nft_set_desc *desc)
3937 {
3938         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3939         const struct nft_set_ops *ops, *bops;
3940         struct nft_set_estimate est, best;
3941         const struct nft_set_type *type;
3942         u32 flags = 0;
3943         int i;
3944
3945         lockdep_assert_held(&nft_net->commit_mutex);
3946         lockdep_nfnl_nft_mutex_not_held();
3947
3948         if (nla[NFTA_SET_FLAGS] != NULL)
3949                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3950
3951         bops        = NULL;
3952         best.size   = ~0;
3953         best.lookup = ~0;
3954         best.space  = ~0;
3955
3956         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3957                 type = nft_set_types[i];
3958                 ops = &type->ops;
3959
3960                 if (!nft_set_ops_candidate(type, flags))
3961                         continue;
3962                 if (!ops->estimate(desc, flags, &est))
3963                         continue;
3964
3965                 switch (desc->policy) {
3966                 case NFT_SET_POL_PERFORMANCE:
3967                         if (est.lookup < best.lookup)
3968                                 break;
3969                         if (est.lookup == best.lookup &&
3970                             est.space < best.space)
3971                                 break;
3972                         continue;
3973                 case NFT_SET_POL_MEMORY:
3974                         if (!desc->size) {
3975                                 if (est.space < best.space)
3976                                         break;
3977                                 if (est.space == best.space &&
3978                                     est.lookup < best.lookup)
3979                                         break;
3980                         } else if (est.size < best.size || !bops) {
3981                                 break;
3982                         }
3983                         continue;
3984                 default:
3985                         break;
3986                 }
3987
3988                 bops = ops;
3989                 best = est;
3990         }
3991
3992         if (bops != NULL)
3993                 return bops;
3994
3995         return ERR_PTR(-EOPNOTSUPP);
3996 }
3997
3998 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3999         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4000                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4001         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4002                                             .len = NFT_SET_MAXNAMELEN - 1 },
4003         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4004         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4005         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4006         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4007         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4008         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4009         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4010         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4011         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4012         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4013         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4014                                             .len  = NFT_USERDATA_MAXLEN },
4015         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4016         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4017         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4018         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
4019 };
4020
4021 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4022         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4023         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
4024 };
4025
4026 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4027                                       const struct nlattr *nla, u8 genmask)
4028 {
4029         struct nft_set *set;
4030
4031         if (nla == NULL)
4032                 return ERR_PTR(-EINVAL);
4033
4034         list_for_each_entry_rcu(set, &table->sets, list) {
4035                 if (!nla_strcmp(nla, set->name) &&
4036                     nft_active_genmask(set, genmask))
4037                         return set;
4038         }
4039         return ERR_PTR(-ENOENT);
4040 }
4041
4042 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4043                                                const struct nlattr *nla,
4044                                                u8 genmask)
4045 {
4046         struct nft_set *set;
4047
4048         list_for_each_entry(set, &table->sets, list) {
4049                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4050                     nft_active_genmask(set, genmask))
4051                         return set;
4052         }
4053         return ERR_PTR(-ENOENT);
4054 }
4055
4056 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4057                                            const struct nft_table *table,
4058                                            const struct nlattr *nla, u8 genmask)
4059 {
4060         struct nftables_pernet *nft_net = nft_pernet(net);
4061         u32 id = ntohl(nla_get_be32(nla));
4062         struct nft_trans *trans;
4063
4064         list_for_each_entry(trans, &nft_net->commit_list, list) {
4065                 if (trans->msg_type == NFT_MSG_NEWSET) {
4066                         struct nft_set *set = nft_trans_set(trans);
4067
4068                         if (id == nft_trans_set_id(trans) &&
4069                             set->table == table &&
4070                             nft_active_genmask(set, genmask))
4071                                 return set;
4072                 }
4073         }
4074         return ERR_PTR(-ENOENT);
4075 }
4076
4077 struct nft_set *nft_set_lookup_global(const struct net *net,
4078                                       const struct nft_table *table,
4079                                       const struct nlattr *nla_set_name,
4080                                       const struct nlattr *nla_set_id,
4081                                       u8 genmask)
4082 {
4083         struct nft_set *set;
4084
4085         set = nft_set_lookup(table, nla_set_name, genmask);
4086         if (IS_ERR(set)) {
4087                 if (!nla_set_id)
4088                         return set;
4089
4090                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4091         }
4092         return set;
4093 }
4094 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4095
4096 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4097                                     const char *name)
4098 {
4099         const struct nft_set *i;
4100         const char *p;
4101         unsigned long *inuse;
4102         unsigned int n = 0, min = 0;
4103
4104         p = strchr(name, '%');
4105         if (p != NULL) {
4106                 if (p[1] != 'd' || strchr(p + 2, '%'))
4107                         return -EINVAL;
4108
4109                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4110                 if (inuse == NULL)
4111                         return -ENOMEM;
4112 cont:
4113                 list_for_each_entry(i, &ctx->table->sets, list) {
4114                         int tmp;
4115
4116                         if (!nft_is_active_next(ctx->net, i))
4117                                 continue;
4118                         if (!sscanf(i->name, name, &tmp))
4119                                 continue;
4120                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4121                                 continue;
4122
4123                         set_bit(tmp - min, inuse);
4124                 }
4125
4126                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4127                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4128                         min += BITS_PER_BYTE * PAGE_SIZE;
4129                         memset(inuse, 0, PAGE_SIZE);
4130                         goto cont;
4131                 }
4132                 free_page((unsigned long)inuse);
4133         }
4134
4135         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4136         if (!set->name)
4137                 return -ENOMEM;
4138
4139         list_for_each_entry(i, &ctx->table->sets, list) {
4140                 if (!nft_is_active_next(ctx->net, i))
4141                         continue;
4142                 if (!strcmp(set->name, i->name)) {
4143                         kfree(set->name);
4144                         set->name = NULL;
4145                         return -ENFILE;
4146                 }
4147         }
4148         return 0;
4149 }
4150
4151 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4152 {
4153         u64 ms = be64_to_cpu(nla_get_be64(nla));
4154         u64 max = (u64)(~((u64)0));
4155
4156         max = div_u64(max, NSEC_PER_MSEC);
4157         if (ms >= max)
4158                 return -ERANGE;
4159
4160         ms *= NSEC_PER_MSEC;
4161         *result = nsecs_to_jiffies64(ms);
4162         return 0;
4163 }
4164
4165 __be64 nf_jiffies64_to_msecs(u64 input)
4166 {
4167         return cpu_to_be64(jiffies64_to_msecs(input));
4168 }
4169
4170 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4171                                      const struct nft_set *set)
4172 {
4173         struct nlattr *concat, *field;
4174         int i;
4175
4176         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4177         if (!concat)
4178                 return -ENOMEM;
4179
4180         for (i = 0; i < set->field_count; i++) {
4181                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4182                 if (!field)
4183                         return -ENOMEM;
4184
4185                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4186                                  htonl(set->field_len[i])))
4187                         return -ENOMEM;
4188
4189                 nla_nest_end(skb, field);
4190         }
4191
4192         nla_nest_end(skb, concat);
4193
4194         return 0;
4195 }
4196
4197 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4198                               const struct nft_set *set, u16 event, u16 flags)
4199 {
4200         u64 timeout = READ_ONCE(set->timeout);
4201         u32 gc_int = READ_ONCE(set->gc_int);
4202         u32 portid = ctx->portid;
4203         struct nlmsghdr *nlh;
4204         struct nlattr *nest;
4205         u32 seq = ctx->seq;
4206         int i;
4207
4208         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4209         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4210                            NFNETLINK_V0, nft_base_seq(ctx->net));
4211         if (!nlh)
4212                 goto nla_put_failure;
4213
4214         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4215                 goto nla_put_failure;
4216         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4217                 goto nla_put_failure;
4218         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4219                          NFTA_SET_PAD))
4220                 goto nla_put_failure;
4221         if (set->flags != 0)
4222                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4223                         goto nla_put_failure;
4224
4225         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4226                 goto nla_put_failure;
4227         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4228                 goto nla_put_failure;
4229         if (set->flags & NFT_SET_MAP) {
4230                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4231                         goto nla_put_failure;
4232                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4233                         goto nla_put_failure;
4234         }
4235         if (set->flags & NFT_SET_OBJECT &&
4236             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4237                 goto nla_put_failure;
4238
4239         if (timeout &&
4240             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4241                          nf_jiffies64_to_msecs(timeout),
4242                          NFTA_SET_PAD))
4243                 goto nla_put_failure;
4244         if (gc_int &&
4245             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4246                 goto nla_put_failure;
4247
4248         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4249                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4250                         goto nla_put_failure;
4251         }
4252
4253         if (set->udata &&
4254             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4255                 goto nla_put_failure;
4256
4257         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4258         if (!nest)
4259                 goto nla_put_failure;
4260         if (set->size &&
4261             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4262                 goto nla_put_failure;
4263
4264         if (set->field_count > 1 &&
4265             nf_tables_fill_set_concat(skb, set))
4266                 goto nla_put_failure;
4267
4268         nla_nest_end(skb, nest);
4269
4270         if (set->num_exprs == 1) {
4271                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4272                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
4273                         goto nla_put_failure;
4274
4275                 nla_nest_end(skb, nest);
4276         } else if (set->num_exprs > 1) {
4277                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4278                 if (nest == NULL)
4279                         goto nla_put_failure;
4280
4281                 for (i = 0; i < set->num_exprs; i++) {
4282                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4283                                           set->exprs[i]) < 0)
4284                                 goto nla_put_failure;
4285                 }
4286                 nla_nest_end(skb, nest);
4287         }
4288
4289         nlmsg_end(skb, nlh);
4290         return 0;
4291
4292 nla_put_failure:
4293         nlmsg_trim(skb, nlh);
4294         return -1;
4295 }
4296
4297 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4298                                  const struct nft_set *set, int event,
4299                                  gfp_t gfp_flags)
4300 {
4301         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4302         u32 portid = ctx->portid;
4303         struct sk_buff *skb;
4304         u16 flags = 0;
4305         int err;
4306
4307         if (!ctx->report &&
4308             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4309                 return;
4310
4311         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4312         if (skb == NULL)
4313                 goto err;
4314
4315         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4316                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4317
4318         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4319         if (err < 0) {
4320                 kfree_skb(skb);
4321                 goto err;
4322         }
4323
4324         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4325         return;
4326 err:
4327         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4328 }
4329
4330 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4331 {
4332         const struct nft_set *set;
4333         unsigned int idx, s_idx = cb->args[0];
4334         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4335         struct net *net = sock_net(skb->sk);
4336         struct nft_ctx *ctx = cb->data, ctx_set;
4337         struct nftables_pernet *nft_net;
4338
4339         if (cb->args[1])
4340                 return skb->len;
4341
4342         rcu_read_lock();
4343         nft_net = nft_pernet(net);
4344         cb->seq = READ_ONCE(nft_net->base_seq);
4345
4346         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4347                 if (ctx->family != NFPROTO_UNSPEC &&
4348                     ctx->family != table->family)
4349                         continue;
4350
4351                 if (ctx->table && ctx->table != table)
4352                         continue;
4353
4354                 if (cur_table) {
4355                         if (cur_table != table)
4356                                 continue;
4357
4358                         cur_table = NULL;
4359                 }
4360                 idx = 0;
4361                 list_for_each_entry_rcu(set, &table->sets, list) {
4362                         if (idx < s_idx)
4363                                 goto cont;
4364                         if (!nft_is_active(net, set))
4365                                 goto cont;
4366
4367                         ctx_set = *ctx;
4368                         ctx_set.table = table;
4369                         ctx_set.family = table->family;
4370
4371                         if (nf_tables_fill_set(skb, &ctx_set, set,
4372                                                NFT_MSG_NEWSET,
4373                                                NLM_F_MULTI) < 0) {
4374                                 cb->args[0] = idx;
4375                                 cb->args[2] = (unsigned long) table;
4376                                 goto done;
4377                         }
4378                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4379 cont:
4380                         idx++;
4381                 }
4382                 if (s_idx)
4383                         s_idx = 0;
4384         }
4385         cb->args[1] = 1;
4386 done:
4387         rcu_read_unlock();
4388         return skb->len;
4389 }
4390
4391 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4392 {
4393         struct nft_ctx *ctx_dump = NULL;
4394
4395         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4396         if (ctx_dump == NULL)
4397                 return -ENOMEM;
4398
4399         cb->data = ctx_dump;
4400         return 0;
4401 }
4402
4403 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4404 {
4405         kfree(cb->data);
4406         return 0;
4407 }
4408
4409 /* called with rcu_read_lock held */
4410 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4411                             const struct nlattr * const nla[])
4412 {
4413         struct netlink_ext_ack *extack = info->extack;
4414         u8 genmask = nft_genmask_cur(info->net);
4415         u8 family = info->nfmsg->nfgen_family;
4416         struct nft_table *table = NULL;
4417         struct net *net = info->net;
4418         const struct nft_set *set;
4419         struct sk_buff *skb2;
4420         struct nft_ctx ctx;
4421         int err;
4422
4423         if (nla[NFTA_SET_TABLE]) {
4424                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4425                                          genmask, 0);
4426                 if (IS_ERR(table)) {
4427                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4428                         return PTR_ERR(table);
4429                 }
4430         }
4431
4432         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4433
4434         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4435                 struct netlink_dump_control c = {
4436                         .start = nf_tables_dump_sets_start,
4437                         .dump = nf_tables_dump_sets,
4438                         .done = nf_tables_dump_sets_done,
4439                         .data = &ctx,
4440                         .module = THIS_MODULE,
4441                 };
4442
4443                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4444         }
4445
4446         /* Only accept unspec with dump */
4447         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4448                 return -EAFNOSUPPORT;
4449         if (!nla[NFTA_SET_TABLE])
4450                 return -EINVAL;
4451
4452         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4453         if (IS_ERR(set))
4454                 return PTR_ERR(set);
4455
4456         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4457         if (skb2 == NULL)
4458                 return -ENOMEM;
4459
4460         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4461         if (err < 0)
4462                 goto err_fill_set_info;
4463
4464         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4465
4466 err_fill_set_info:
4467         kfree_skb(skb2);
4468         return err;
4469 }
4470
4471 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4472         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4473 };
4474
4475 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4476                                      struct nft_set_desc *desc)
4477 {
4478         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4479         u32 len;
4480         int err;
4481
4482         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4483                 return -E2BIG;
4484
4485         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4486                                           nft_concat_policy, NULL);
4487         if (err < 0)
4488                 return err;
4489
4490         if (!tb[NFTA_SET_FIELD_LEN])
4491                 return -EINVAL;
4492
4493         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4494         if (!len || len > U8_MAX)
4495                 return -EINVAL;
4496
4497         desc->field_len[desc->field_count++] = len;
4498
4499         return 0;
4500 }
4501
4502 static int nft_set_desc_concat(struct nft_set_desc *desc,
4503                                const struct nlattr *nla)
4504 {
4505         struct nlattr *attr;
4506         u32 num_regs = 0;
4507         int rem, err, i;
4508
4509         nla_for_each_nested(attr, nla, rem) {
4510                 if (nla_type(attr) != NFTA_LIST_ELEM)
4511                         return -EINVAL;
4512
4513                 err = nft_set_desc_concat_parse(attr, desc);
4514                 if (err < 0)
4515                         return err;
4516         }
4517
4518         for (i = 0; i < desc->field_count; i++)
4519                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4520
4521         if (num_regs > NFT_REG32_COUNT)
4522                 return -E2BIG;
4523
4524         return 0;
4525 }
4526
4527 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4528                                     const struct nlattr *nla)
4529 {
4530         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4531         int err;
4532
4533         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4534                                           nft_set_desc_policy, NULL);
4535         if (err < 0)
4536                 return err;
4537
4538         if (da[NFTA_SET_DESC_SIZE] != NULL)
4539                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4540         if (da[NFTA_SET_DESC_CONCAT])
4541                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4542
4543         return err;
4544 }
4545
4546 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4547                               const struct nlattr * const *nla,
4548                               struct nft_expr **exprs, int *num_exprs,
4549                               u32 flags)
4550 {
4551         struct nft_expr *expr;
4552         int err, i;
4553
4554         if (nla[NFTA_SET_EXPR]) {
4555                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4556                 if (IS_ERR(expr)) {
4557                         err = PTR_ERR(expr);
4558                         goto err_set_expr_alloc;
4559                 }
4560                 exprs[0] = expr;
4561                 (*num_exprs)++;
4562         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4563                 struct nlattr *tmp;
4564                 int left;
4565
4566                 if (!(flags & NFT_SET_EXPR)) {
4567                         err = -EINVAL;
4568                         goto err_set_expr_alloc;
4569                 }
4570                 i = 0;
4571                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4572                         if (i == NFT_SET_EXPR_MAX) {
4573                                 err = -E2BIG;
4574                                 goto err_set_expr_alloc;
4575                         }
4576                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4577                                 err = -EINVAL;
4578                                 goto err_set_expr_alloc;
4579                         }
4580                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4581                         if (IS_ERR(expr)) {
4582                                 err = PTR_ERR(expr);
4583                                 goto err_set_expr_alloc;
4584                         }
4585                         exprs[i++] = expr;
4586                         (*num_exprs)++;
4587                 }
4588         }
4589
4590         return 0;
4591
4592 err_set_expr_alloc:
4593         for (i = 0; i < *num_exprs; i++)
4594                 nft_expr_destroy(ctx, exprs[i]);
4595
4596         return err;
4597 }
4598
4599 static bool nft_set_is_same(const struct nft_set *set,
4600                             const struct nft_set_desc *desc,
4601                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4602 {
4603         int i;
4604
4605         if (set->ktype != desc->ktype ||
4606             set->dtype != desc->dtype ||
4607             set->flags != flags ||
4608             set->klen != desc->klen ||
4609             set->dlen != desc->dlen ||
4610             set->field_count != desc->field_count ||
4611             set->num_exprs != num_exprs)
4612                 return false;
4613
4614         for (i = 0; i < desc->field_count; i++) {
4615                 if (set->field_len[i] != desc->field_len[i])
4616                         return false;
4617         }
4618
4619         for (i = 0; i < num_exprs; i++) {
4620                 if (set->exprs[i]->ops != exprs[i]->ops)
4621                         return false;
4622         }
4623
4624         return true;
4625 }
4626
4627 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4628                             const struct nlattr * const nla[])
4629 {
4630         struct netlink_ext_ack *extack = info->extack;
4631         u8 genmask = nft_genmask_next(info->net);
4632         u8 family = info->nfmsg->nfgen_family;
4633         const struct nft_set_ops *ops;
4634         struct net *net = info->net;
4635         struct nft_set_desc desc;
4636         struct nft_table *table;
4637         unsigned char *udata;
4638         struct nft_set *set;
4639         struct nft_ctx ctx;
4640         size_t alloc_size;
4641         int num_exprs = 0;
4642         char *name;
4643         int err, i;
4644         u16 udlen;
4645         u32 flags;
4646         u64 size;
4647
4648         if (nla[NFTA_SET_TABLE] == NULL ||
4649             nla[NFTA_SET_NAME] == NULL ||
4650             nla[NFTA_SET_KEY_LEN] == NULL ||
4651             nla[NFTA_SET_ID] == NULL)
4652                 return -EINVAL;
4653
4654         memset(&desc, 0, sizeof(desc));
4655
4656         desc.ktype = NFT_DATA_VALUE;
4657         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4658                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4659                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4660                         return -EINVAL;
4661         }
4662
4663         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4664         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4665                 return -EINVAL;
4666
4667         flags = 0;
4668         if (nla[NFTA_SET_FLAGS] != NULL) {
4669                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4670                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4671                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4672                               NFT_SET_MAP | NFT_SET_EVAL |
4673                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4674                         return -EOPNOTSUPP;
4675                 /* Only one of these operations is supported */
4676                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4677                              (NFT_SET_MAP | NFT_SET_OBJECT))
4678                         return -EOPNOTSUPP;
4679                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4680                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4681                         return -EOPNOTSUPP;
4682         }
4683
4684         desc.dtype = 0;
4685         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4686                 if (!(flags & NFT_SET_MAP))
4687                         return -EINVAL;
4688
4689                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4690                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4691                     desc.dtype != NFT_DATA_VERDICT)
4692                         return -EINVAL;
4693
4694                 if (desc.dtype != NFT_DATA_VERDICT) {
4695                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4696                                 return -EINVAL;
4697                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4698                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4699                                 return -EINVAL;
4700                 } else
4701                         desc.dlen = sizeof(struct nft_verdict);
4702         } else if (flags & NFT_SET_MAP)
4703                 return -EINVAL;
4704
4705         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4706                 if (!(flags & NFT_SET_OBJECT))
4707                         return -EINVAL;
4708
4709                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4710                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4711                     desc.objtype > NFT_OBJECT_MAX)
4712                         return -EOPNOTSUPP;
4713         } else if (flags & NFT_SET_OBJECT)
4714                 return -EINVAL;
4715         else
4716                 desc.objtype = NFT_OBJECT_UNSPEC;
4717
4718         desc.timeout = 0;
4719         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4720                 if (!(flags & NFT_SET_TIMEOUT))
4721                         return -EINVAL;
4722
4723                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4724                 if (err)
4725                         return err;
4726         }
4727         desc.gc_int = 0;
4728         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4729                 if (!(flags & NFT_SET_TIMEOUT))
4730                         return -EINVAL;
4731                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4732         }
4733
4734         desc.policy = NFT_SET_POL_PERFORMANCE;
4735         if (nla[NFTA_SET_POLICY] != NULL)
4736                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4737
4738         if (nla[NFTA_SET_DESC] != NULL) {
4739                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4740                 if (err < 0)
4741                         return err;
4742
4743                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4744                         return -EINVAL;
4745         } else if (flags & NFT_SET_CONCAT) {
4746                 return -EINVAL;
4747         }
4748
4749         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4750                 desc.expr = true;
4751
4752         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4753                                  NETLINK_CB(skb).portid);
4754         if (IS_ERR(table)) {
4755                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4756                 return PTR_ERR(table);
4757         }
4758
4759         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4760
4761         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4762         if (IS_ERR(set)) {
4763                 if (PTR_ERR(set) != -ENOENT) {
4764                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4765                         return PTR_ERR(set);
4766                 }
4767         } else {
4768                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4769
4770                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4771                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4772                         return -EEXIST;
4773                 }
4774                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4775                         return -EOPNOTSUPP;
4776
4777                 if (nft_set_is_anonymous(set))
4778                         return -EOPNOTSUPP;
4779
4780                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4781                 if (err < 0)
4782                         return err;
4783
4784                 err = 0;
4785                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4786                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4787                         err = -EEXIST;
4788                 }
4789
4790                 for (i = 0; i < num_exprs; i++)
4791                         nft_expr_destroy(&ctx, exprs[i]);
4792
4793                 if (err < 0)
4794                         return err;
4795
4796                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4797         }
4798
4799         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4800                 return -ENOENT;
4801
4802         ops = nft_select_set_ops(&ctx, nla, &desc);
4803         if (IS_ERR(ops))
4804                 return PTR_ERR(ops);
4805
4806         udlen = 0;
4807         if (nla[NFTA_SET_USERDATA])
4808                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4809
4810         size = 0;
4811         if (ops->privsize != NULL)
4812                 size = ops->privsize(nla, &desc);
4813         alloc_size = sizeof(*set) + size + udlen;
4814         if (alloc_size < size || alloc_size > INT_MAX)
4815                 return -ENOMEM;
4816         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4817         if (!set)
4818                 return -ENOMEM;
4819
4820         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4821         if (!name) {
4822                 err = -ENOMEM;
4823                 goto err_set_name;
4824         }
4825
4826         err = nf_tables_set_alloc_name(&ctx, set, name);
4827         kfree(name);
4828         if (err < 0)
4829                 goto err_set_name;
4830
4831         udata = NULL;
4832         if (udlen) {
4833                 udata = set->data + size;
4834                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4835         }
4836
4837         INIT_LIST_HEAD(&set->bindings);
4838         INIT_LIST_HEAD(&set->catchall_list);
4839         set->table = table;
4840         write_pnet(&set->net, net);
4841         set->ops = ops;
4842         set->ktype = desc.ktype;
4843         set->klen = desc.klen;
4844         set->dtype = desc.dtype;
4845         set->objtype = desc.objtype;
4846         set->dlen = desc.dlen;
4847         set->flags = flags;
4848         set->size = desc.size;
4849         set->policy = desc.policy;
4850         set->udlen = udlen;
4851         set->udata = udata;
4852         set->timeout = desc.timeout;
4853         set->gc_int = desc.gc_int;
4854
4855         set->field_count = desc.field_count;
4856         for (i = 0; i < desc.field_count; i++)
4857                 set->field_len[i] = desc.field_len[i];
4858
4859         err = ops->init(set, &desc, nla);
4860         if (err < 0)
4861                 goto err_set_init;
4862
4863         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4864         if (err < 0)
4865                 goto err_set_destroy;
4866
4867         set->num_exprs = num_exprs;
4868         set->handle = nf_tables_alloc_handle(table);
4869         INIT_LIST_HEAD(&set->pending_update);
4870
4871         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4872         if (err < 0)
4873                 goto err_set_expr_alloc;
4874
4875         list_add_tail_rcu(&set->list, &table->sets);
4876         table->use++;
4877         return 0;
4878
4879 err_set_expr_alloc:
4880         for (i = 0; i < set->num_exprs; i++)
4881                 nft_expr_destroy(&ctx, set->exprs[i]);
4882 err_set_destroy:
4883         ops->destroy(&ctx, set);
4884 err_set_init:
4885         kfree(set->name);
4886 err_set_name:
4887         kvfree(set);
4888         return err;
4889 }
4890
4891 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4892                                      struct nft_set *set)
4893 {
4894         struct nft_set_elem_catchall *next, *catchall;
4895
4896         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4897                 list_del_rcu(&catchall->list);
4898                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
4899                 kfree_rcu(catchall, rcu);
4900         }
4901 }
4902
4903 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4904 {
4905         int i;
4906
4907         if (WARN_ON(set->use > 0))
4908                 return;
4909
4910         for (i = 0; i < set->num_exprs; i++)
4911                 nft_expr_destroy(ctx, set->exprs[i]);
4912
4913         set->ops->destroy(ctx, set);
4914         nft_set_catchall_destroy(ctx, set);
4915         kfree(set->name);
4916         kvfree(set);
4917 }
4918
4919 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4920                             const struct nlattr * const nla[])
4921 {
4922         struct netlink_ext_ack *extack = info->extack;
4923         u8 genmask = nft_genmask_next(info->net);
4924         u8 family = info->nfmsg->nfgen_family;
4925         struct net *net = info->net;
4926         const struct nlattr *attr;
4927         struct nft_table *table;
4928         struct nft_set *set;
4929         struct nft_ctx ctx;
4930
4931         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4932                 return -EAFNOSUPPORT;
4933
4934         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4935                                  genmask, NETLINK_CB(skb).portid);
4936         if (IS_ERR(table)) {
4937                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4938                 return PTR_ERR(table);
4939         }
4940
4941         if (nla[NFTA_SET_HANDLE]) {
4942                 attr = nla[NFTA_SET_HANDLE];
4943                 set = nft_set_lookup_byhandle(table, attr, genmask);
4944         } else {
4945                 attr = nla[NFTA_SET_NAME];
4946                 set = nft_set_lookup(table, attr, genmask);
4947         }
4948
4949         if (IS_ERR(set)) {
4950                 NL_SET_BAD_ATTR(extack, attr);
4951                 return PTR_ERR(set);
4952         }
4953         if (set->use ||
4954             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4955              atomic_read(&set->nelems) > 0)) {
4956                 NL_SET_BAD_ATTR(extack, attr);
4957                 return -EBUSY;
4958         }
4959
4960         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4961
4962         return nft_delset(&ctx, set);
4963 }
4964
4965 static int nft_validate_register_store(const struct nft_ctx *ctx,
4966                                        enum nft_registers reg,
4967                                        const struct nft_data *data,
4968                                        enum nft_data_types type,
4969                                        unsigned int len);
4970
4971 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4972                                      struct nft_set *set,
4973                                      struct nft_set_elem *elem)
4974 {
4975         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4976         enum nft_registers dreg;
4977
4978         dreg = nft_type_to_reg(set->dtype);
4979         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4980                                            set->dtype == NFT_DATA_VERDICT ?
4981                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4982                                            set->dlen);
4983 }
4984
4985 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4986                                         struct nft_set *set,
4987                                         const struct nft_set_iter *iter,
4988                                         struct nft_set_elem *elem)
4989 {
4990         return nft_setelem_data_validate(ctx, set, elem);
4991 }
4992
4993 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4994                                        struct nft_set *set)
4995 {
4996         u8 genmask = nft_genmask_next(ctx->net);
4997         struct nft_set_elem_catchall *catchall;
4998         struct nft_set_elem elem;
4999         struct nft_set_ext *ext;
5000         int ret = 0;
5001
5002         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5003                 ext = nft_set_elem_ext(set, catchall->elem);
5004                 if (!nft_set_elem_active(ext, genmask))
5005                         continue;
5006
5007                 elem.priv = catchall->elem;
5008                 ret = nft_setelem_data_validate(ctx, set, &elem);
5009                 if (ret < 0)
5010                         break;
5011         }
5012
5013         return ret;
5014 }
5015
5016 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5017                        struct nft_set_binding *binding)
5018 {
5019         struct nft_set_binding *i;
5020         struct nft_set_iter iter;
5021
5022         if (set->use == UINT_MAX)
5023                 return -EOVERFLOW;
5024
5025         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5026                 return -EBUSY;
5027
5028         if (binding->flags & NFT_SET_MAP) {
5029                 /* If the set is already bound to the same chain all
5030                  * jumps are already validated for that chain.
5031                  */
5032                 list_for_each_entry(i, &set->bindings, list) {
5033                         if (i->flags & NFT_SET_MAP &&
5034                             i->chain == binding->chain)
5035                                 goto bind;
5036                 }
5037
5038                 iter.genmask    = nft_genmask_next(ctx->net);
5039                 iter.skip       = 0;
5040                 iter.count      = 0;
5041                 iter.err        = 0;
5042                 iter.fn         = nf_tables_bind_check_setelem;
5043
5044                 set->ops->walk(ctx, set, &iter);
5045                 if (!iter.err)
5046                         iter.err = nft_set_catchall_bind_check(ctx, set);
5047
5048                 if (iter.err < 0)
5049                         return iter.err;
5050         }
5051 bind:
5052         binding->chain = ctx->chain;
5053         list_add_tail_rcu(&binding->list, &set->bindings);
5054         nft_set_trans_bind(ctx, set);
5055         set->use++;
5056
5057         return 0;
5058 }
5059 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5060
5061 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5062                                  struct nft_set_binding *binding, bool event)
5063 {
5064         list_del_rcu(&binding->list);
5065
5066         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5067                 list_del_rcu(&set->list);
5068                 if (event)
5069                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5070                                              GFP_KERNEL);
5071         }
5072 }
5073
5074 static void nft_setelem_data_activate(const struct net *net,
5075                                       const struct nft_set *set,
5076                                       struct nft_set_elem *elem);
5077
5078 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5079                                 struct nft_set *set,
5080                                 const struct nft_set_iter *iter,
5081                                 struct nft_set_elem *elem)
5082 {
5083         nft_setelem_data_activate(ctx->net, set, elem);
5084
5085         return 0;
5086 }
5087
5088 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5089                                       struct nft_set *set)
5090 {
5091         u8 genmask = nft_genmask_next(ctx->net);
5092         struct nft_set_elem_catchall *catchall;
5093         struct nft_set_elem elem;
5094         struct nft_set_ext *ext;
5095
5096         list_for_each_entry(catchall, &set->catchall_list, list) {
5097                 ext = nft_set_elem_ext(set, catchall->elem);
5098                 if (!nft_set_elem_active(ext, genmask))
5099                         continue;
5100
5101                 elem.priv = catchall->elem;
5102                 nft_setelem_data_activate(ctx->net, set, &elem);
5103                 break;
5104         }
5105 }
5106
5107 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5108 {
5109         struct nft_set_iter iter = {
5110                 .genmask        = nft_genmask_next(ctx->net),
5111                 .fn             = nft_mapelem_activate,
5112         };
5113
5114         set->ops->walk(ctx, set, &iter);
5115         WARN_ON_ONCE(iter.err);
5116
5117         nft_map_catchall_activate(ctx, set);
5118 }
5119
5120 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5121 {
5122         if (nft_set_is_anonymous(set)) {
5123                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5124                         nft_map_activate(ctx, set);
5125
5126                 nft_clear(ctx->net, set);
5127         }
5128
5129         set->use++;
5130 }
5131 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5132
5133 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5134                               struct nft_set_binding *binding,
5135                               enum nft_trans_phase phase)
5136 {
5137         switch (phase) {
5138         case NFT_TRANS_PREPARE_ERROR:
5139                 nft_set_trans_unbind(ctx, set);
5140                 if (nft_set_is_anonymous(set))
5141                         nft_deactivate_next(ctx->net, set);
5142                 else
5143                         list_del_rcu(&binding->list);
5144
5145                 set->use--;
5146                 break;
5147         case NFT_TRANS_PREPARE:
5148                 if (nft_set_is_anonymous(set)) {
5149                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5150                                 nft_map_deactivate(ctx, set);
5151
5152                         nft_deactivate_next(ctx->net, set);
5153                 }
5154                 set->use--;
5155                 return;
5156         case NFT_TRANS_ABORT:
5157         case NFT_TRANS_RELEASE:
5158                 if (nft_set_is_anonymous(set) &&
5159                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5160                         nft_map_deactivate(ctx, set);
5161
5162                 set->use--;
5163                 fallthrough;
5164         default:
5165                 nf_tables_unbind_set(ctx, set, binding,
5166                                      phase == NFT_TRANS_COMMIT);
5167         }
5168 }
5169 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5170
5171 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5172 {
5173         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5174                 nft_set_destroy(ctx, set);
5175 }
5176 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5177
5178 const struct nft_set_ext_type nft_set_ext_types[] = {
5179         [NFT_SET_EXT_KEY]               = {
5180                 .align  = __alignof__(u32),
5181         },
5182         [NFT_SET_EXT_DATA]              = {
5183                 .align  = __alignof__(u32),
5184         },
5185         [NFT_SET_EXT_EXPRESSIONS]       = {
5186                 .align  = __alignof__(struct nft_set_elem_expr),
5187         },
5188         [NFT_SET_EXT_OBJREF]            = {
5189                 .len    = sizeof(struct nft_object *),
5190                 .align  = __alignof__(struct nft_object *),
5191         },
5192         [NFT_SET_EXT_FLAGS]             = {
5193                 .len    = sizeof(u8),
5194                 .align  = __alignof__(u8),
5195         },
5196         [NFT_SET_EXT_TIMEOUT]           = {
5197                 .len    = sizeof(u64),
5198                 .align  = __alignof__(u64),
5199         },
5200         [NFT_SET_EXT_EXPIRATION]        = {
5201                 .len    = sizeof(u64),
5202                 .align  = __alignof__(u64),
5203         },
5204         [NFT_SET_EXT_USERDATA]          = {
5205                 .len    = sizeof(struct nft_userdata),
5206                 .align  = __alignof__(struct nft_userdata),
5207         },
5208         [NFT_SET_EXT_KEY_END]           = {
5209                 .align  = __alignof__(u32),
5210         },
5211 };
5212
5213 /*
5214  * Set elements
5215  */
5216
5217 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5218         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5219         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5220         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5221         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5222         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5223         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5224                                             .len = NFT_USERDATA_MAXLEN },
5225         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5226         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5227                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5228         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5229         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5230 };
5231
5232 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5233         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5234                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5235         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5236                                             .len = NFT_SET_MAXNAMELEN - 1 },
5237         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5238         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5239 };
5240
5241 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5242                                   const struct nft_set *set,
5243                                   const struct nft_set_ext *ext)
5244 {
5245         struct nft_set_elem_expr *elem_expr;
5246         u32 size, num_exprs = 0;
5247         struct nft_expr *expr;
5248         struct nlattr *nest;
5249
5250         elem_expr = nft_set_ext_expr(ext);
5251         nft_setelem_expr_foreach(expr, elem_expr, size)
5252                 num_exprs++;
5253
5254         if (num_exprs == 1) {
5255                 expr = nft_setelem_expr_at(elem_expr, 0);
5256                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
5257                         return -1;
5258
5259                 return 0;
5260         } else if (num_exprs > 1) {
5261                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5262                 if (nest == NULL)
5263                         goto nla_put_failure;
5264
5265                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5266                         expr = nft_setelem_expr_at(elem_expr, size);
5267                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
5268                                 goto nla_put_failure;
5269                 }
5270                 nla_nest_end(skb, nest);
5271         }
5272         return 0;
5273
5274 nla_put_failure:
5275         return -1;
5276 }
5277
5278 static int nf_tables_fill_setelem(struct sk_buff *skb,
5279                                   const struct nft_set *set,
5280                                   const struct nft_set_elem *elem)
5281 {
5282         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5283         unsigned char *b = skb_tail_pointer(skb);
5284         struct nlattr *nest;
5285
5286         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5287         if (nest == NULL)
5288                 goto nla_put_failure;
5289
5290         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5291             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5292                           NFT_DATA_VALUE, set->klen) < 0)
5293                 goto nla_put_failure;
5294
5295         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5296             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5297                           NFT_DATA_VALUE, set->klen) < 0)
5298                 goto nla_put_failure;
5299
5300         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5301             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5302                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5303                           set->dlen) < 0)
5304                 goto nla_put_failure;
5305
5306         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5307             nft_set_elem_expr_dump(skb, set, ext))
5308                 goto nla_put_failure;
5309
5310         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5311             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5312                            (*nft_set_ext_obj(ext))->key.name) < 0)
5313                 goto nla_put_failure;
5314
5315         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5316             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5317                          htonl(*nft_set_ext_flags(ext))))
5318                 goto nla_put_failure;
5319
5320         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5321             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5322                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5323                          NFTA_SET_ELEM_PAD))
5324                 goto nla_put_failure;
5325
5326         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5327                 u64 expires, now = get_jiffies_64();
5328
5329                 expires = *nft_set_ext_expiration(ext);
5330                 if (time_before64(now, expires))
5331                         expires -= now;
5332                 else
5333                         expires = 0;
5334
5335                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5336                                  nf_jiffies64_to_msecs(expires),
5337                                  NFTA_SET_ELEM_PAD))
5338                         goto nla_put_failure;
5339         }
5340
5341         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5342                 struct nft_userdata *udata;
5343
5344                 udata = nft_set_ext_userdata(ext);
5345                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5346                             udata->len + 1, udata->data))
5347                         goto nla_put_failure;
5348         }
5349
5350         nla_nest_end(skb, nest);
5351         return 0;
5352
5353 nla_put_failure:
5354         nlmsg_trim(skb, b);
5355         return -EMSGSIZE;
5356 }
5357
5358 struct nft_set_dump_args {
5359         const struct netlink_callback   *cb;
5360         struct nft_set_iter             iter;
5361         struct sk_buff                  *skb;
5362 };
5363
5364 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5365                                   struct nft_set *set,
5366                                   const struct nft_set_iter *iter,
5367                                   struct nft_set_elem *elem)
5368 {
5369         struct nft_set_dump_args *args;
5370
5371         args = container_of(iter, struct nft_set_dump_args, iter);
5372         return nf_tables_fill_setelem(args->skb, set, elem);
5373 }
5374
5375 struct nft_set_dump_ctx {
5376         const struct nft_set    *set;
5377         struct nft_ctx          ctx;
5378 };
5379
5380 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5381                                  const struct nft_set *set)
5382 {
5383         struct nft_set_elem_catchall *catchall;
5384         u8 genmask = nft_genmask_cur(net);
5385         struct nft_set_elem elem;
5386         struct nft_set_ext *ext;
5387         int ret = 0;
5388
5389         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5390                 ext = nft_set_elem_ext(set, catchall->elem);
5391                 if (!nft_set_elem_active(ext, genmask) ||
5392                     nft_set_elem_expired(ext))
5393                         continue;
5394
5395                 elem.priv = catchall->elem;
5396                 ret = nf_tables_fill_setelem(skb, set, &elem);
5397                 break;
5398         }
5399
5400         return ret;
5401 }
5402
5403 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5404 {
5405         struct nft_set_dump_ctx *dump_ctx = cb->data;
5406         struct net *net = sock_net(skb->sk);
5407         struct nftables_pernet *nft_net;
5408         struct nft_table *table;
5409         struct nft_set *set;
5410         struct nft_set_dump_args args;
5411         bool set_found = false;
5412         struct nlmsghdr *nlh;
5413         struct nlattr *nest;
5414         u32 portid, seq;
5415         int event;
5416
5417         rcu_read_lock();
5418         nft_net = nft_pernet(net);
5419         cb->seq = READ_ONCE(nft_net->base_seq);
5420
5421         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5422                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5423                     dump_ctx->ctx.family != table->family)
5424                         continue;
5425
5426                 if (table != dump_ctx->ctx.table)
5427                         continue;
5428
5429                 list_for_each_entry_rcu(set, &table->sets, list) {
5430                         if (set == dump_ctx->set) {
5431                                 set_found = true;
5432                                 break;
5433                         }
5434                 }
5435                 break;
5436         }
5437
5438         if (!set_found) {
5439                 rcu_read_unlock();
5440                 return -ENOENT;
5441         }
5442
5443         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5444         portid = NETLINK_CB(cb->skb).portid;
5445         seq    = cb->nlh->nlmsg_seq;
5446
5447         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5448                            table->family, NFNETLINK_V0, nft_base_seq(net));
5449         if (!nlh)
5450                 goto nla_put_failure;
5451
5452         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5453                 goto nla_put_failure;
5454         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5455                 goto nla_put_failure;
5456
5457         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5458         if (nest == NULL)
5459                 goto nla_put_failure;
5460
5461         args.cb                 = cb;
5462         args.skb                = skb;
5463         args.iter.genmask       = nft_genmask_cur(net);
5464         args.iter.skip          = cb->args[0];
5465         args.iter.count         = 0;
5466         args.iter.err           = 0;
5467         args.iter.fn            = nf_tables_dump_setelem;
5468         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5469
5470         if (!args.iter.err && args.iter.count == cb->args[0])
5471                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5472         rcu_read_unlock();
5473
5474         nla_nest_end(skb, nest);
5475         nlmsg_end(skb, nlh);
5476
5477         if (args.iter.err && args.iter.err != -EMSGSIZE)
5478                 return args.iter.err;
5479         if (args.iter.count == cb->args[0])
5480                 return 0;
5481
5482         cb->args[0] = args.iter.count;
5483         return skb->len;
5484
5485 nla_put_failure:
5486         rcu_read_unlock();
5487         return -ENOSPC;
5488 }
5489
5490 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5491 {
5492         struct nft_set_dump_ctx *dump_ctx = cb->data;
5493
5494         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5495
5496         return cb->data ? 0 : -ENOMEM;
5497 }
5498
5499 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5500 {
5501         kfree(cb->data);
5502         return 0;
5503 }
5504
5505 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5506                                        const struct nft_ctx *ctx, u32 seq,
5507                                        u32 portid, int event, u16 flags,
5508                                        const struct nft_set *set,
5509                                        const struct nft_set_elem *elem)
5510 {
5511         struct nlmsghdr *nlh;
5512         struct nlattr *nest;
5513         int err;
5514
5515         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5516         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5517                            NFNETLINK_V0, nft_base_seq(ctx->net));
5518         if (!nlh)
5519                 goto nla_put_failure;
5520
5521         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5522                 goto nla_put_failure;
5523         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5524                 goto nla_put_failure;
5525
5526         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5527         if (nest == NULL)
5528                 goto nla_put_failure;
5529
5530         err = nf_tables_fill_setelem(skb, set, elem);
5531         if (err < 0)
5532                 goto nla_put_failure;
5533
5534         nla_nest_end(skb, nest);
5535
5536         nlmsg_end(skb, nlh);
5537         return 0;
5538
5539 nla_put_failure:
5540         nlmsg_trim(skb, nlh);
5541         return -1;
5542 }
5543
5544 static int nft_setelem_parse_flags(const struct nft_set *set,
5545                                    const struct nlattr *attr, u32 *flags)
5546 {
5547         if (attr == NULL)
5548                 return 0;
5549
5550         *flags = ntohl(nla_get_be32(attr));
5551         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5552                 return -EOPNOTSUPP;
5553         if (!(set->flags & NFT_SET_INTERVAL) &&
5554             *flags & NFT_SET_ELEM_INTERVAL_END)
5555                 return -EINVAL;
5556         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5557             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5558                 return -EINVAL;
5559
5560         return 0;
5561 }
5562
5563 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5564                                  struct nft_data *key, struct nlattr *attr)
5565 {
5566         struct nft_data_desc desc = {
5567                 .type   = NFT_DATA_VALUE,
5568                 .size   = NFT_DATA_VALUE_MAXLEN,
5569                 .len    = set->klen,
5570         };
5571
5572         return nft_data_init(ctx, key, &desc, attr);
5573 }
5574
5575 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5576                                   struct nft_data_desc *desc,
5577                                   struct nft_data *data,
5578                                   struct nlattr *attr)
5579 {
5580         u32 dtype;
5581
5582         if (set->dtype == NFT_DATA_VERDICT)
5583                 dtype = NFT_DATA_VERDICT;
5584         else
5585                 dtype = NFT_DATA_VALUE;
5586
5587         desc->type = dtype;
5588         desc->size = NFT_DATA_VALUE_MAXLEN;
5589         desc->len = set->dlen;
5590         desc->flags = NFT_DATA_DESC_SETELEM;
5591
5592         return nft_data_init(ctx, data, desc, attr);
5593 }
5594
5595 static void *nft_setelem_catchall_get(const struct net *net,
5596                                       const struct nft_set *set)
5597 {
5598         struct nft_set_elem_catchall *catchall;
5599         u8 genmask = nft_genmask_cur(net);
5600         struct nft_set_ext *ext;
5601         void *priv = NULL;
5602
5603         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5604                 ext = nft_set_elem_ext(set, catchall->elem);
5605                 if (!nft_set_elem_active(ext, genmask) ||
5606                     nft_set_elem_expired(ext))
5607                         continue;
5608
5609                 priv = catchall->elem;
5610                 break;
5611         }
5612
5613         return priv;
5614 }
5615
5616 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5617                            struct nft_set_elem *elem, u32 flags)
5618 {
5619         void *priv;
5620
5621         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5622                 priv = set->ops->get(ctx->net, set, elem, flags);
5623                 if (IS_ERR(priv))
5624                         return PTR_ERR(priv);
5625         } else {
5626                 priv = nft_setelem_catchall_get(ctx->net, set);
5627                 if (!priv)
5628                         return -ENOENT;
5629         }
5630         elem->priv = priv;
5631
5632         return 0;
5633 }
5634
5635 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5636                             const struct nlattr *attr)
5637 {
5638         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5639         struct nft_set_elem elem;
5640         struct sk_buff *skb;
5641         uint32_t flags = 0;
5642         int err;
5643
5644         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5645                                           nft_set_elem_policy, NULL);
5646         if (err < 0)
5647                 return err;
5648
5649         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5650         if (err < 0)
5651                 return err;
5652
5653         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5654                 return -EINVAL;
5655
5656         if (nla[NFTA_SET_ELEM_KEY]) {
5657                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5658                                             nla[NFTA_SET_ELEM_KEY]);
5659                 if (err < 0)
5660                         return err;
5661         }
5662
5663         if (nla[NFTA_SET_ELEM_KEY_END]) {
5664                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5665                                             nla[NFTA_SET_ELEM_KEY_END]);
5666                 if (err < 0)
5667                         return err;
5668         }
5669
5670         err = nft_setelem_get(ctx, set, &elem, flags);
5671         if (err < 0)
5672                 return err;
5673
5674         err = -ENOMEM;
5675         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5676         if (skb == NULL)
5677                 return err;
5678
5679         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5680                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5681         if (err < 0)
5682                 goto err_fill_setelem;
5683
5684         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5685
5686 err_fill_setelem:
5687         kfree_skb(skb);
5688         return err;
5689 }
5690
5691 /* called with rcu_read_lock held */
5692 static int nf_tables_getsetelem(struct sk_buff *skb,
5693                                 const struct nfnl_info *info,
5694                                 const struct nlattr * const nla[])
5695 {
5696         struct netlink_ext_ack *extack = info->extack;
5697         u8 genmask = nft_genmask_cur(info->net);
5698         u8 family = info->nfmsg->nfgen_family;
5699         struct net *net = info->net;
5700         struct nft_table *table;
5701         struct nft_set *set;
5702         struct nlattr *attr;
5703         struct nft_ctx ctx;
5704         int rem, err = 0;
5705
5706         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5707                                  genmask, 0);
5708         if (IS_ERR(table)) {
5709                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5710                 return PTR_ERR(table);
5711         }
5712
5713         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5714         if (IS_ERR(set))
5715                 return PTR_ERR(set);
5716
5717         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5718
5719         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5720                 struct netlink_dump_control c = {
5721                         .start = nf_tables_dump_set_start,
5722                         .dump = nf_tables_dump_set,
5723                         .done = nf_tables_dump_set_done,
5724                         .module = THIS_MODULE,
5725                 };
5726                 struct nft_set_dump_ctx dump_ctx = {
5727                         .set = set,
5728                         .ctx = ctx,
5729                 };
5730
5731                 c.data = &dump_ctx;
5732                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5733         }
5734
5735         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5736                 return -EINVAL;
5737
5738         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5739                 err = nft_get_set_elem(&ctx, set, attr);
5740                 if (err < 0) {
5741                         NL_SET_BAD_ATTR(extack, attr);
5742                         break;
5743                 }
5744         }
5745
5746         return err;
5747 }
5748
5749 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5750                                      const struct nft_set *set,
5751                                      const struct nft_set_elem *elem,
5752                                      int event)
5753 {
5754         struct nftables_pernet *nft_net;
5755         struct net *net = ctx->net;
5756         u32 portid = ctx->portid;
5757         struct sk_buff *skb;
5758         u16 flags = 0;
5759         int err;
5760
5761         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5762                 return;
5763
5764         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5765         if (skb == NULL)
5766                 goto err;
5767
5768         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5769                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5770
5771         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5772                                           set, elem);
5773         if (err < 0) {
5774                 kfree_skb(skb);
5775                 goto err;
5776         }
5777
5778         nft_net = nft_pernet(net);
5779         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5780         return;
5781 err:
5782         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5783 }
5784
5785 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5786                                               int msg_type,
5787                                               struct nft_set *set)
5788 {
5789         struct nft_trans *trans;
5790
5791         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5792         if (trans == NULL)
5793                 return NULL;
5794
5795         nft_trans_elem_set(trans) = set;
5796         return trans;
5797 }
5798
5799 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5800                                          const struct nft_set *set,
5801                                          const struct nlattr *attr)
5802 {
5803         struct nft_expr *expr;
5804         int err;
5805
5806         expr = nft_expr_init(ctx, attr);
5807         if (IS_ERR(expr))
5808                 return expr;
5809
5810         err = -EOPNOTSUPP;
5811         if (expr->ops->type->flags & NFT_EXPR_GC) {
5812                 if (set->flags & NFT_SET_TIMEOUT)
5813                         goto err_set_elem_expr;
5814                 if (!set->ops->gc_init)
5815                         goto err_set_elem_expr;
5816                 set->ops->gc_init(set);
5817         }
5818
5819         return expr;
5820
5821 err_set_elem_expr:
5822         nft_expr_destroy(ctx, expr);
5823         return ERR_PTR(err);
5824 }
5825
5826 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5827 {
5828         len += nft_set_ext_types[id].len;
5829         if (len > tmpl->ext_len[id] ||
5830             len > U8_MAX)
5831                 return -1;
5832
5833         return 0;
5834 }
5835
5836 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5837                               void *to, const void *from, u32 len)
5838 {
5839         if (nft_set_ext_check(tmpl, id, len) < 0)
5840                 return -1;
5841
5842         memcpy(to, from, len);
5843
5844         return 0;
5845 }
5846
5847 void *nft_set_elem_init(const struct nft_set *set,
5848                         const struct nft_set_ext_tmpl *tmpl,
5849                         const u32 *key, const u32 *key_end,
5850                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5851 {
5852         struct nft_set_ext *ext;
5853         void *elem;
5854
5855         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5856         if (elem == NULL)
5857                 return ERR_PTR(-ENOMEM);
5858
5859         ext = nft_set_elem_ext(set, elem);
5860         nft_set_ext_init(ext, tmpl);
5861
5862         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5863             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5864                                nft_set_ext_key(ext), key, set->klen) < 0)
5865                 goto err_ext_check;
5866
5867         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5868             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5869                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5870                 goto err_ext_check;
5871
5872         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5873             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5874                                nft_set_ext_data(ext), data, set->dlen) < 0)
5875                 goto err_ext_check;
5876
5877         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5878                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5879                 if (expiration == 0)
5880                         *nft_set_ext_expiration(ext) += timeout;
5881         }
5882         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5883                 *nft_set_ext_timeout(ext) = timeout;
5884
5885         return elem;
5886
5887 err_ext_check:
5888         kfree(elem);
5889
5890         return ERR_PTR(-EINVAL);
5891 }
5892
5893 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5894                                         struct nft_expr *expr)
5895 {
5896         if (expr->ops->destroy_clone) {
5897                 expr->ops->destroy_clone(ctx, expr);
5898                 module_put(expr->ops->type->owner);
5899         } else {
5900                 nf_tables_expr_destroy(ctx, expr);
5901         }
5902 }
5903
5904 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5905                                       struct nft_set_elem_expr *elem_expr)
5906 {
5907         struct nft_expr *expr;
5908         u32 size;
5909
5910         nft_setelem_expr_foreach(expr, elem_expr, size)
5911                 __nft_set_elem_expr_destroy(ctx, expr);
5912 }
5913
5914 /* Drop references and destroy. Called from gc, dynset and abort path. */
5915 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5916                           bool destroy_expr)
5917 {
5918         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5919         struct nft_ctx ctx = {
5920                 .net    = read_pnet(&set->net),
5921                 .family = set->table->family,
5922         };
5923
5924         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5925         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5926                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5927         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5928                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5929
5930         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5931                 (*nft_set_ext_obj(ext))->use--;
5932         kfree(elem);
5933 }
5934 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5935
5936 /* Destroy element. References have been already dropped in the preparation
5937  * path via nft_setelem_data_deactivate().
5938  */
5939 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5940                                 const struct nft_set *set, void *elem)
5941 {
5942         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5943
5944         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5945                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5946
5947         kfree(elem);
5948 }
5949
5950 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5951                             struct nft_expr *expr_array[])
5952 {
5953         struct nft_expr *expr;
5954         int err, i, k;
5955
5956         for (i = 0; i < set->num_exprs; i++) {
5957                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5958                 if (!expr)
5959                         goto err_expr;
5960
5961                 err = nft_expr_clone(expr, set->exprs[i]);
5962                 if (err < 0) {
5963                         kfree(expr);
5964                         goto err_expr;
5965                 }
5966                 expr_array[i] = expr;
5967         }
5968
5969         return 0;
5970
5971 err_expr:
5972         for (k = i - 1; k >= 0; k--)
5973                 nft_expr_destroy(ctx, expr_array[k]);
5974
5975         return -ENOMEM;
5976 }
5977
5978 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5979                                    const struct nft_set_ext_tmpl *tmpl,
5980                                    const struct nft_set_ext *ext,
5981                                    struct nft_expr *expr_array[],
5982                                    u32 num_exprs)
5983 {
5984         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5985         u32 len = sizeof(struct nft_set_elem_expr);
5986         struct nft_expr *expr;
5987         int i, err;
5988
5989         if (num_exprs == 0)
5990                 return 0;
5991
5992         for (i = 0; i < num_exprs; i++)
5993                 len += expr_array[i]->ops->size;
5994
5995         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5996                 return -EINVAL;
5997
5998         for (i = 0; i < num_exprs; i++) {
5999                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6000                 err = nft_expr_clone(expr, expr_array[i]);
6001                 if (err < 0)
6002                         goto err_elem_expr_setup;
6003
6004                 elem_expr->size += expr_array[i]->ops->size;
6005                 nft_expr_destroy(ctx, expr_array[i]);
6006                 expr_array[i] = NULL;
6007         }
6008
6009         return 0;
6010
6011 err_elem_expr_setup:
6012         for (; i < num_exprs; i++) {
6013                 nft_expr_destroy(ctx, expr_array[i]);
6014                 expr_array[i] = NULL;
6015         }
6016
6017         return -ENOMEM;
6018 }
6019
6020 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6021                                             const struct nft_set *set)
6022 {
6023         struct nft_set_elem_catchall *catchall;
6024         u8 genmask = nft_genmask_cur(net);
6025         struct nft_set_ext *ext;
6026
6027         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6028                 ext = nft_set_elem_ext(set, catchall->elem);
6029                 if (nft_set_elem_active(ext, genmask) &&
6030                     !nft_set_elem_expired(ext))
6031                         return ext;
6032         }
6033
6034         return NULL;
6035 }
6036 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6037
6038 void *nft_set_catchall_gc(const struct nft_set *set)
6039 {
6040         struct nft_set_elem_catchall *catchall, *next;
6041         struct nft_set_ext *ext;
6042         void *elem = NULL;
6043
6044         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6045                 ext = nft_set_elem_ext(set, catchall->elem);
6046
6047                 if (!nft_set_elem_expired(ext) ||
6048                     nft_set_elem_mark_busy(ext))
6049                         continue;
6050
6051                 elem = catchall->elem;
6052                 list_del_rcu(&catchall->list);
6053                 kfree_rcu(catchall, rcu);
6054                 break;
6055         }
6056
6057         return elem;
6058 }
6059 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
6060
6061 static int nft_setelem_catchall_insert(const struct net *net,
6062                                        struct nft_set *set,
6063                                        const struct nft_set_elem *elem,
6064                                        struct nft_set_ext **pext)
6065 {
6066         struct nft_set_elem_catchall *catchall;
6067         u8 genmask = nft_genmask_next(net);
6068         struct nft_set_ext *ext;
6069
6070         list_for_each_entry(catchall, &set->catchall_list, list) {
6071                 ext = nft_set_elem_ext(set, catchall->elem);
6072                 if (nft_set_elem_active(ext, genmask)) {
6073                         *pext = ext;
6074                         return -EEXIST;
6075                 }
6076         }
6077
6078         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6079         if (!catchall)
6080                 return -ENOMEM;
6081
6082         catchall->elem = elem->priv;
6083         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6084
6085         return 0;
6086 }
6087
6088 static int nft_setelem_insert(const struct net *net,
6089                               struct nft_set *set,
6090                               const struct nft_set_elem *elem,
6091                               struct nft_set_ext **ext, unsigned int flags)
6092 {
6093         int ret;
6094
6095         if (flags & NFT_SET_ELEM_CATCHALL)
6096                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6097         else
6098                 ret = set->ops->insert(net, set, elem, ext);
6099
6100         return ret;
6101 }
6102
6103 static bool nft_setelem_is_catchall(const struct nft_set *set,
6104                                     const struct nft_set_elem *elem)
6105 {
6106         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6107
6108         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6109             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6110                 return true;
6111
6112         return false;
6113 }
6114
6115 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6116                                  struct nft_set_elem *elem)
6117 {
6118         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6119
6120         if (nft_setelem_is_catchall(set, elem)) {
6121                 nft_set_elem_change_active(net, set, ext);
6122                 nft_set_elem_clear_busy(ext);
6123         } else {
6124                 set->ops->activate(net, set, elem);
6125         }
6126 }
6127
6128 static int nft_setelem_catchall_deactivate(const struct net *net,
6129                                            struct nft_set *set,
6130                                            struct nft_set_elem *elem)
6131 {
6132         struct nft_set_elem_catchall *catchall;
6133         struct nft_set_ext *ext;
6134
6135         list_for_each_entry(catchall, &set->catchall_list, list) {
6136                 ext = nft_set_elem_ext(set, catchall->elem);
6137                 if (!nft_is_active(net, ext) ||
6138                     nft_set_elem_mark_busy(ext))
6139                         continue;
6140
6141                 kfree(elem->priv);
6142                 elem->priv = catchall->elem;
6143                 nft_set_elem_change_active(net, set, ext);
6144                 return 0;
6145         }
6146
6147         return -ENOENT;
6148 }
6149
6150 static int __nft_setelem_deactivate(const struct net *net,
6151                                     struct nft_set *set,
6152                                     struct nft_set_elem *elem)
6153 {
6154         void *priv;
6155
6156         priv = set->ops->deactivate(net, set, elem);
6157         if (!priv)
6158                 return -ENOENT;
6159
6160         kfree(elem->priv);
6161         elem->priv = priv;
6162         set->ndeact++;
6163
6164         return 0;
6165 }
6166
6167 static int nft_setelem_deactivate(const struct net *net,
6168                                   struct nft_set *set,
6169                                   struct nft_set_elem *elem, u32 flags)
6170 {
6171         int ret;
6172
6173         if (flags & NFT_SET_ELEM_CATCHALL)
6174                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6175         else
6176                 ret = __nft_setelem_deactivate(net, set, elem);
6177
6178         return ret;
6179 }
6180
6181 static void nft_setelem_catchall_remove(const struct net *net,
6182                                         const struct nft_set *set,
6183                                         const struct nft_set_elem *elem)
6184 {
6185         struct nft_set_elem_catchall *catchall, *next;
6186
6187         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6188                 if (catchall->elem == elem->priv) {
6189                         list_del_rcu(&catchall->list);
6190                         kfree_rcu(catchall, rcu);
6191                         break;
6192                 }
6193         }
6194 }
6195
6196 static void nft_setelem_remove(const struct net *net,
6197                                const struct nft_set *set,
6198                                const struct nft_set_elem *elem)
6199 {
6200         if (nft_setelem_is_catchall(set, elem))
6201                 nft_setelem_catchall_remove(net, set, elem);
6202         else
6203                 set->ops->remove(net, set, elem);
6204 }
6205
6206 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6207                                       struct nlattr **nla, u32 flags)
6208 {
6209         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6210                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6211                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6212                         return false;
6213
6214                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6215                     flags & NFT_SET_ELEM_CATCHALL)
6216                         return false;
6217         } else {
6218                 if (nla[NFTA_SET_ELEM_KEY_END])
6219                         return false;
6220         }
6221
6222         return true;
6223 }
6224
6225 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6226                             const struct nlattr *attr, u32 nlmsg_flags)
6227 {
6228         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6229         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6230         u8 genmask = nft_genmask_next(ctx->net);
6231         u32 flags = 0, size = 0, num_exprs = 0;
6232         struct nft_set_ext_tmpl tmpl;
6233         struct nft_set_ext *ext, *ext2;
6234         struct nft_set_elem elem;
6235         struct nft_set_binding *binding;
6236         struct nft_object *obj = NULL;
6237         struct nft_userdata *udata;
6238         struct nft_data_desc desc;
6239         enum nft_registers dreg;
6240         struct nft_trans *trans;
6241         u64 timeout;
6242         u64 expiration;
6243         int err, i;
6244         u8 ulen;
6245
6246         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6247                                           nft_set_elem_policy, NULL);
6248         if (err < 0)
6249                 return err;
6250
6251         nft_set_ext_prepare(&tmpl);
6252
6253         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6254         if (err < 0)
6255                 return err;
6256
6257         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6258             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6259                 return -EINVAL;
6260
6261         if (flags != 0) {
6262                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6263                 if (err < 0)
6264                         return err;
6265         }
6266
6267         if (set->flags & NFT_SET_MAP) {
6268                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6269                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6270                         return -EINVAL;
6271         } else {
6272                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6273                         return -EINVAL;
6274         }
6275
6276         if (set->flags & NFT_SET_OBJECT) {
6277                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6278                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6279                         return -EINVAL;
6280         } else {
6281                 if (nla[NFTA_SET_ELEM_OBJREF])
6282                         return -EINVAL;
6283         }
6284
6285         if (!nft_setelem_valid_key_end(set, nla, flags))
6286                 return -EINVAL;
6287
6288         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6289              (nla[NFTA_SET_ELEM_DATA] ||
6290               nla[NFTA_SET_ELEM_OBJREF] ||
6291               nla[NFTA_SET_ELEM_TIMEOUT] ||
6292               nla[NFTA_SET_ELEM_EXPIRATION] ||
6293               nla[NFTA_SET_ELEM_USERDATA] ||
6294               nla[NFTA_SET_ELEM_EXPR] ||
6295               nla[NFTA_SET_ELEM_KEY_END] ||
6296               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6297                 return -EINVAL;
6298
6299         timeout = 0;
6300         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6301                 if (!(set->flags & NFT_SET_TIMEOUT))
6302                         return -EINVAL;
6303                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6304                                             &timeout);
6305                 if (err)
6306                         return err;
6307         } else if (set->flags & NFT_SET_TIMEOUT &&
6308                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6309                 timeout = READ_ONCE(set->timeout);
6310         }
6311
6312         expiration = 0;
6313         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6314                 if (!(set->flags & NFT_SET_TIMEOUT))
6315                         return -EINVAL;
6316                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6317                                             &expiration);
6318                 if (err)
6319                         return err;
6320         }
6321
6322         if (nla[NFTA_SET_ELEM_EXPR]) {
6323                 struct nft_expr *expr;
6324
6325                 if (set->num_exprs && set->num_exprs != 1)
6326                         return -EOPNOTSUPP;
6327
6328                 expr = nft_set_elem_expr_alloc(ctx, set,
6329                                                nla[NFTA_SET_ELEM_EXPR]);
6330                 if (IS_ERR(expr))
6331                         return PTR_ERR(expr);
6332
6333                 expr_array[0] = expr;
6334                 num_exprs = 1;
6335
6336                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6337                         err = -EOPNOTSUPP;
6338                         goto err_set_elem_expr;
6339                 }
6340         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6341                 struct nft_expr *expr;
6342                 struct nlattr *tmp;
6343                 int left;
6344
6345                 i = 0;
6346                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6347                         if (i == NFT_SET_EXPR_MAX ||
6348                             (set->num_exprs && set->num_exprs == i)) {
6349                                 err = -E2BIG;
6350                                 goto err_set_elem_expr;
6351                         }
6352                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6353                                 err = -EINVAL;
6354                                 goto err_set_elem_expr;
6355                         }
6356                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6357                         if (IS_ERR(expr)) {
6358                                 err = PTR_ERR(expr);
6359                                 goto err_set_elem_expr;
6360                         }
6361                         expr_array[i] = expr;
6362                         num_exprs++;
6363
6364                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6365                                 err = -EOPNOTSUPP;
6366                                 goto err_set_elem_expr;
6367                         }
6368                         i++;
6369                 }
6370                 if (set->num_exprs && set->num_exprs != i) {
6371                         err = -EOPNOTSUPP;
6372                         goto err_set_elem_expr;
6373                 }
6374         } else if (set->num_exprs > 0 &&
6375                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6376                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6377                 if (err < 0)
6378                         goto err_set_elem_expr_clone;
6379
6380                 num_exprs = set->num_exprs;
6381         }
6382
6383         if (nla[NFTA_SET_ELEM_KEY]) {
6384                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6385                                             nla[NFTA_SET_ELEM_KEY]);
6386                 if (err < 0)
6387                         goto err_set_elem_expr;
6388
6389                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6390                 if (err < 0)
6391                         goto err_parse_key;
6392         }
6393
6394         if (nla[NFTA_SET_ELEM_KEY_END]) {
6395                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6396                                             nla[NFTA_SET_ELEM_KEY_END]);
6397                 if (err < 0)
6398                         goto err_parse_key;
6399
6400                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6401                 if (err < 0)
6402                         goto err_parse_key_end;
6403         }
6404
6405         if (timeout > 0) {
6406                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6407                 if (err < 0)
6408                         goto err_parse_key_end;
6409
6410                 if (timeout != READ_ONCE(set->timeout)) {
6411                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6412                         if (err < 0)
6413                                 goto err_parse_key_end;
6414                 }
6415         }
6416
6417         if (num_exprs) {
6418                 for (i = 0; i < num_exprs; i++)
6419                         size += expr_array[i]->ops->size;
6420
6421                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6422                                              sizeof(struct nft_set_elem_expr) + size);
6423                 if (err < 0)
6424                         goto err_parse_key_end;
6425         }
6426
6427         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6428                 obj = nft_obj_lookup(ctx->net, ctx->table,
6429                                      nla[NFTA_SET_ELEM_OBJREF],
6430                                      set->objtype, genmask);
6431                 if (IS_ERR(obj)) {
6432                         err = PTR_ERR(obj);
6433                         goto err_parse_key_end;
6434                 }
6435                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6436                 if (err < 0)
6437                         goto err_parse_key_end;
6438         }
6439
6440         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6441                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6442                                              nla[NFTA_SET_ELEM_DATA]);
6443                 if (err < 0)
6444                         goto err_parse_key_end;
6445
6446                 dreg = nft_type_to_reg(set->dtype);
6447                 list_for_each_entry(binding, &set->bindings, list) {
6448                         struct nft_ctx bind_ctx = {
6449                                 .net    = ctx->net,
6450                                 .family = ctx->family,
6451                                 .table  = ctx->table,
6452                                 .chain  = (struct nft_chain *)binding->chain,
6453                         };
6454
6455                         if (!(binding->flags & NFT_SET_MAP))
6456                                 continue;
6457
6458                         err = nft_validate_register_store(&bind_ctx, dreg,
6459                                                           &elem.data.val,
6460                                                           desc.type, desc.len);
6461                         if (err < 0)
6462                                 goto err_parse_data;
6463
6464                         if (desc.type == NFT_DATA_VERDICT &&
6465                             (elem.data.val.verdict.code == NFT_GOTO ||
6466                              elem.data.val.verdict.code == NFT_JUMP))
6467                                 nft_validate_state_update(ctx->net,
6468                                                           NFT_VALIDATE_NEED);
6469                 }
6470
6471                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6472                 if (err < 0)
6473                         goto err_parse_data;
6474         }
6475
6476         /* The full maximum length of userdata can exceed the maximum
6477          * offset value (U8_MAX) for following extensions, therefor it
6478          * must be the last extension added.
6479          */
6480         ulen = 0;
6481         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6482                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6483                 if (ulen > 0) {
6484                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6485                                                      ulen);
6486                         if (err < 0)
6487                                 goto err_parse_data;
6488                 }
6489         }
6490
6491         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6492                                       elem.key_end.val.data, elem.data.val.data,
6493                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6494         if (IS_ERR(elem.priv)) {
6495                 err = PTR_ERR(elem.priv);
6496                 goto err_parse_data;
6497         }
6498
6499         ext = nft_set_elem_ext(set, elem.priv);
6500         if (flags)
6501                 *nft_set_ext_flags(ext) = flags;
6502
6503         if (ulen > 0) {
6504                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6505                         err = -EINVAL;
6506                         goto err_elem_userdata;
6507                 }
6508                 udata = nft_set_ext_userdata(ext);
6509                 udata->len = ulen - 1;
6510                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6511         }
6512         if (obj) {
6513                 *nft_set_ext_obj(ext) = obj;
6514                 obj->use++;
6515         }
6516         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6517         if (err < 0)
6518                 goto err_elem_free;
6519
6520         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6521         if (trans == NULL) {
6522                 err = -ENOMEM;
6523                 goto err_elem_free;
6524         }
6525
6526         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6527
6528         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6529         if (err) {
6530                 if (err == -EEXIST) {
6531                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6532                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6533                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6534                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6535                                 goto err_element_clash;
6536                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6537                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6538                              memcmp(nft_set_ext_data(ext),
6539                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6540                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6541                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6542                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6543                                 goto err_element_clash;
6544                         else if (!(nlmsg_flags & NLM_F_EXCL))
6545                                 err = 0;
6546                 } else if (err == -ENOTEMPTY) {
6547                         /* ENOTEMPTY reports overlapping between this element
6548                          * and an existing one.
6549                          */
6550                         err = -EEXIST;
6551                 }
6552                 goto err_element_clash;
6553         }
6554
6555         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6556             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6557                 err = -ENFILE;
6558                 goto err_set_full;
6559         }
6560
6561         nft_trans_elem(trans) = elem;
6562         nft_trans_commit_list_add_tail(ctx->net, trans);
6563         return 0;
6564
6565 err_set_full:
6566         nft_setelem_remove(ctx->net, set, &elem);
6567 err_element_clash:
6568         kfree(trans);
6569 err_elem_free:
6570         if (obj)
6571                 obj->use--;
6572 err_elem_userdata:
6573         nft_set_elem_destroy(set, elem.priv, true);
6574 err_parse_data:
6575         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6576                 nft_data_release(&elem.data.val, desc.type);
6577 err_parse_key_end:
6578         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6579 err_parse_key:
6580         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6581 err_set_elem_expr:
6582         for (i = 0; i < num_exprs && expr_array[i]; i++)
6583                 nft_expr_destroy(ctx, expr_array[i]);
6584 err_set_elem_expr_clone:
6585         return err;
6586 }
6587
6588 static int nf_tables_newsetelem(struct sk_buff *skb,
6589                                 const struct nfnl_info *info,
6590                                 const struct nlattr * const nla[])
6591 {
6592         struct nftables_pernet *nft_net = nft_pernet(info->net);
6593         struct netlink_ext_ack *extack = info->extack;
6594         u8 genmask = nft_genmask_next(info->net);
6595         u8 family = info->nfmsg->nfgen_family;
6596         struct net *net = info->net;
6597         const struct nlattr *attr;
6598         struct nft_table *table;
6599         struct nft_set *set;
6600         struct nft_ctx ctx;
6601         int rem, err;
6602
6603         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6604                 return -EINVAL;
6605
6606         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6607                                  genmask, NETLINK_CB(skb).portid);
6608         if (IS_ERR(table)) {
6609                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6610                 return PTR_ERR(table);
6611         }
6612
6613         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6614                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6615         if (IS_ERR(set))
6616                 return PTR_ERR(set);
6617
6618         if (!list_empty(&set->bindings) &&
6619             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6620                 return -EBUSY;
6621
6622         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6623
6624         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6625                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6626                 if (err < 0) {
6627                         NL_SET_BAD_ATTR(extack, attr);
6628                         return err;
6629                 }
6630         }
6631
6632         if (nft_net->validate_state == NFT_VALIDATE_DO)
6633                 return nft_table_validate(net, table);
6634
6635         return 0;
6636 }
6637
6638 /**
6639  *      nft_data_hold - hold a nft_data item
6640  *
6641  *      @data: struct nft_data to release
6642  *      @type: type of data
6643  *
6644  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6645  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6646  *      NFT_GOTO verdicts. This function must be called on active data objects
6647  *      from the second phase of the commit protocol.
6648  */
6649 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6650 {
6651         struct nft_chain *chain;
6652
6653         if (type == NFT_DATA_VERDICT) {
6654                 switch (data->verdict.code) {
6655                 case NFT_JUMP:
6656                 case NFT_GOTO:
6657                         chain = data->verdict.chain;
6658                         chain->use++;
6659                         break;
6660                 }
6661         }
6662 }
6663
6664 static void nft_setelem_data_activate(const struct net *net,
6665                                       const struct nft_set *set,
6666                                       struct nft_set_elem *elem)
6667 {
6668         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6669
6670         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6671                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6672         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6673                 (*nft_set_ext_obj(ext))->use++;
6674 }
6675
6676 static void nft_setelem_data_deactivate(const struct net *net,
6677                                         const struct nft_set *set,
6678                                         struct nft_set_elem *elem)
6679 {
6680         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6681
6682         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6683                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6684         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6685                 (*nft_set_ext_obj(ext))->use--;
6686 }
6687
6688 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6689                            const struct nlattr *attr)
6690 {
6691         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6692         struct nft_set_ext_tmpl tmpl;
6693         struct nft_set_elem elem;
6694         struct nft_set_ext *ext;
6695         struct nft_trans *trans;
6696         u32 flags = 0;
6697         int err;
6698
6699         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6700                                           nft_set_elem_policy, NULL);
6701         if (err < 0)
6702                 return err;
6703
6704         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6705         if (err < 0)
6706                 return err;
6707
6708         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6709                 return -EINVAL;
6710
6711         if (!nft_setelem_valid_key_end(set, nla, flags))
6712                 return -EINVAL;
6713
6714         nft_set_ext_prepare(&tmpl);
6715
6716         if (flags != 0) {
6717                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6718                 if (err < 0)
6719                         return err;
6720         }
6721
6722         if (nla[NFTA_SET_ELEM_KEY]) {
6723                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6724                                             nla[NFTA_SET_ELEM_KEY]);
6725                 if (err < 0)
6726                         return err;
6727
6728                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6729                 if (err < 0)
6730                         goto fail_elem;
6731         }
6732
6733         if (nla[NFTA_SET_ELEM_KEY_END]) {
6734                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6735                                             nla[NFTA_SET_ELEM_KEY_END]);
6736                 if (err < 0)
6737                         goto fail_elem;
6738
6739                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6740                 if (err < 0)
6741                         goto fail_elem_key_end;
6742         }
6743
6744         err = -ENOMEM;
6745         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6746                                       elem.key_end.val.data, NULL, 0, 0,
6747                                       GFP_KERNEL_ACCOUNT);
6748         if (IS_ERR(elem.priv)) {
6749                 err = PTR_ERR(elem.priv);
6750                 goto fail_elem_key_end;
6751         }
6752
6753         ext = nft_set_elem_ext(set, elem.priv);
6754         if (flags)
6755                 *nft_set_ext_flags(ext) = flags;
6756
6757         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6758         if (trans == NULL)
6759                 goto fail_trans;
6760
6761         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6762         if (err < 0)
6763                 goto fail_ops;
6764
6765         nft_setelem_data_deactivate(ctx->net, set, &elem);
6766
6767         nft_trans_elem(trans) = elem;
6768         nft_trans_commit_list_add_tail(ctx->net, trans);
6769         return 0;
6770
6771 fail_ops:
6772         kfree(trans);
6773 fail_trans:
6774         kfree(elem.priv);
6775 fail_elem_key_end:
6776         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6777 fail_elem:
6778         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6779         return err;
6780 }
6781
6782 static int nft_setelem_flush(const struct nft_ctx *ctx,
6783                              struct nft_set *set,
6784                              const struct nft_set_iter *iter,
6785                              struct nft_set_elem *elem)
6786 {
6787         struct nft_trans *trans;
6788         int err;
6789
6790         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6791                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6792         if (!trans)
6793                 return -ENOMEM;
6794
6795         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6796                 err = -ENOENT;
6797                 goto err1;
6798         }
6799         set->ndeact++;
6800
6801         nft_setelem_data_deactivate(ctx->net, set, elem);
6802         nft_trans_elem_set(trans) = set;
6803         nft_trans_elem(trans) = *elem;
6804         nft_trans_commit_list_add_tail(ctx->net, trans);
6805
6806         return 0;
6807 err1:
6808         kfree(trans);
6809         return err;
6810 }
6811
6812 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6813                                     struct nft_set *set,
6814                                     struct nft_set_elem *elem)
6815 {
6816         struct nft_trans *trans;
6817
6818         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6819                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6820         if (!trans)
6821                 return -ENOMEM;
6822
6823         nft_setelem_data_deactivate(ctx->net, set, elem);
6824         nft_trans_elem_set(trans) = set;
6825         nft_trans_elem(trans) = *elem;
6826         nft_trans_commit_list_add_tail(ctx->net, trans);
6827
6828         return 0;
6829 }
6830
6831 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6832                                   struct nft_set *set)
6833 {
6834         u8 genmask = nft_genmask_next(ctx->net);
6835         struct nft_set_elem_catchall *catchall;
6836         struct nft_set_elem elem;
6837         struct nft_set_ext *ext;
6838         int ret = 0;
6839
6840         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6841                 ext = nft_set_elem_ext(set, catchall->elem);
6842                 if (!nft_set_elem_active(ext, genmask) ||
6843                     nft_set_elem_mark_busy(ext))
6844                         continue;
6845
6846                 elem.priv = catchall->elem;
6847                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6848                 if (ret < 0)
6849                         break;
6850         }
6851
6852         return ret;
6853 }
6854
6855 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6856 {
6857         struct nft_set_iter iter = {
6858                 .genmask        = genmask,
6859                 .fn             = nft_setelem_flush,
6860         };
6861
6862         set->ops->walk(ctx, set, &iter);
6863         if (!iter.err)
6864                 iter.err = nft_set_catchall_flush(ctx, set);
6865
6866         return iter.err;
6867 }
6868
6869 static int nf_tables_delsetelem(struct sk_buff *skb,
6870                                 const struct nfnl_info *info,
6871                                 const struct nlattr * const nla[])
6872 {
6873         struct netlink_ext_ack *extack = info->extack;
6874         u8 genmask = nft_genmask_next(info->net);
6875         u8 family = info->nfmsg->nfgen_family;
6876         struct net *net = info->net;
6877         const struct nlattr *attr;
6878         struct nft_table *table;
6879         struct nft_set *set;
6880         struct nft_ctx ctx;
6881         int rem, err = 0;
6882
6883         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6884                                  genmask, NETLINK_CB(skb).portid);
6885         if (IS_ERR(table)) {
6886                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6887                 return PTR_ERR(table);
6888         }
6889
6890         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6891         if (IS_ERR(set))
6892                 return PTR_ERR(set);
6893
6894         if (!list_empty(&set->bindings) &&
6895             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6896                 return -EBUSY;
6897
6898         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6899
6900         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6901                 return nft_set_flush(&ctx, set, genmask);
6902
6903         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6904                 err = nft_del_setelem(&ctx, set, attr);
6905                 if (err < 0) {
6906                         NL_SET_BAD_ATTR(extack, attr);
6907                         break;
6908                 }
6909         }
6910         return err;
6911 }
6912
6913 void nft_set_gc_batch_release(struct rcu_head *rcu)
6914 {
6915         struct nft_set_gc_batch *gcb;
6916         unsigned int i;
6917
6918         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6919         for (i = 0; i < gcb->head.cnt; i++)
6920                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6921         kfree(gcb);
6922 }
6923
6924 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6925                                                 gfp_t gfp)
6926 {
6927         struct nft_set_gc_batch *gcb;
6928
6929         gcb = kzalloc(sizeof(*gcb), gfp);
6930         if (gcb == NULL)
6931                 return gcb;
6932         gcb->head.set = set;
6933         return gcb;
6934 }
6935
6936 /*
6937  * Stateful objects
6938  */
6939
6940 /**
6941  *      nft_register_obj- register nf_tables stateful object type
6942  *      @obj_type: object type
6943  *
6944  *      Registers the object type for use with nf_tables. Returns zero on
6945  *      success or a negative errno code otherwise.
6946  */
6947 int nft_register_obj(struct nft_object_type *obj_type)
6948 {
6949         if (obj_type->type == NFT_OBJECT_UNSPEC)
6950                 return -EINVAL;
6951
6952         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6953         list_add_rcu(&obj_type->list, &nf_tables_objects);
6954         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6955         return 0;
6956 }
6957 EXPORT_SYMBOL_GPL(nft_register_obj);
6958
6959 /**
6960  *      nft_unregister_obj - unregister nf_tables object type
6961  *      @obj_type: object type
6962  *
6963  *      Unregisters the object type for use with nf_tables.
6964  */
6965 void nft_unregister_obj(struct nft_object_type *obj_type)
6966 {
6967         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6968         list_del_rcu(&obj_type->list);
6969         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6970 }
6971 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6972
6973 struct nft_object *nft_obj_lookup(const struct net *net,
6974                                   const struct nft_table *table,
6975                                   const struct nlattr *nla, u32 objtype,
6976                                   u8 genmask)
6977 {
6978         struct nft_object_hash_key k = { .table = table };
6979         char search[NFT_OBJ_MAXNAMELEN];
6980         struct rhlist_head *tmp, *list;
6981         struct nft_object *obj;
6982
6983         nla_strscpy(search, nla, sizeof(search));
6984         k.name = search;
6985
6986         WARN_ON_ONCE(!rcu_read_lock_held() &&
6987                      !lockdep_commit_lock_is_held(net));
6988
6989         rcu_read_lock();
6990         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6991         if (!list)
6992                 goto out;
6993
6994         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6995                 if (objtype == obj->ops->type->type &&
6996                     nft_active_genmask(obj, genmask)) {
6997                         rcu_read_unlock();
6998                         return obj;
6999                 }
7000         }
7001 out:
7002         rcu_read_unlock();
7003         return ERR_PTR(-ENOENT);
7004 }
7005 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7006
7007 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7008                                                   const struct nlattr *nla,
7009                                                   u32 objtype, u8 genmask)
7010 {
7011         struct nft_object *obj;
7012
7013         list_for_each_entry(obj, &table->objects, list) {
7014                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7015                     objtype == obj->ops->type->type &&
7016                     nft_active_genmask(obj, genmask))
7017                         return obj;
7018         }
7019         return ERR_PTR(-ENOENT);
7020 }
7021
7022 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7023         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7024                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7025         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7026                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7027         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7028         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7029         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7030         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7031                                     .len = NFT_USERDATA_MAXLEN },
7032 };
7033
7034 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7035                                        const struct nft_object_type *type,
7036                                        const struct nlattr *attr)
7037 {
7038         struct nlattr **tb;
7039         const struct nft_object_ops *ops;
7040         struct nft_object *obj;
7041         int err = -ENOMEM;
7042
7043         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7044         if (!tb)
7045                 goto err1;
7046
7047         if (attr) {
7048                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7049                                                   type->policy, NULL);
7050                 if (err < 0)
7051                         goto err2;
7052         } else {
7053                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7054         }
7055
7056         if (type->select_ops) {
7057                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7058                 if (IS_ERR(ops)) {
7059                         err = PTR_ERR(ops);
7060                         goto err2;
7061                 }
7062         } else {
7063                 ops = type->ops;
7064         }
7065
7066         err = -ENOMEM;
7067         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7068         if (!obj)
7069                 goto err2;
7070
7071         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7072         if (err < 0)
7073                 goto err3;
7074
7075         obj->ops = ops;
7076
7077         kfree(tb);
7078         return obj;
7079 err3:
7080         kfree(obj);
7081 err2:
7082         kfree(tb);
7083 err1:
7084         return ERR_PTR(err);
7085 }
7086
7087 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7088                            struct nft_object *obj, bool reset)
7089 {
7090         struct nlattr *nest;
7091
7092         nest = nla_nest_start_noflag(skb, attr);
7093         if (!nest)
7094                 goto nla_put_failure;
7095         if (obj->ops->dump(skb, obj, reset) < 0)
7096                 goto nla_put_failure;
7097         nla_nest_end(skb, nest);
7098         return 0;
7099
7100 nla_put_failure:
7101         return -1;
7102 }
7103
7104 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7105 {
7106         const struct nft_object_type *type;
7107
7108         list_for_each_entry(type, &nf_tables_objects, list) {
7109                 if (objtype == type->type)
7110                         return type;
7111         }
7112         return NULL;
7113 }
7114
7115 static const struct nft_object_type *
7116 nft_obj_type_get(struct net *net, u32 objtype)
7117 {
7118         const struct nft_object_type *type;
7119
7120         type = __nft_obj_type_get(objtype);
7121         if (type != NULL && try_module_get(type->owner))
7122                 return type;
7123
7124         lockdep_nfnl_nft_mutex_not_held();
7125 #ifdef CONFIG_MODULES
7126         if (type == NULL) {
7127                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7128                         return ERR_PTR(-EAGAIN);
7129         }
7130 #endif
7131         return ERR_PTR(-ENOENT);
7132 }
7133
7134 static int nf_tables_updobj(const struct nft_ctx *ctx,
7135                             const struct nft_object_type *type,
7136                             const struct nlattr *attr,
7137                             struct nft_object *obj)
7138 {
7139         struct nft_object *newobj;
7140         struct nft_trans *trans;
7141         int err = -ENOMEM;
7142
7143         if (!try_module_get(type->owner))
7144                 return -ENOENT;
7145
7146         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7147                                 sizeof(struct nft_trans_obj));
7148         if (!trans)
7149                 goto err_trans;
7150
7151         newobj = nft_obj_init(ctx, type, attr);
7152         if (IS_ERR(newobj)) {
7153                 err = PTR_ERR(newobj);
7154                 goto err_free_trans;
7155         }
7156
7157         nft_trans_obj(trans) = obj;
7158         nft_trans_obj_update(trans) = true;
7159         nft_trans_obj_newobj(trans) = newobj;
7160         nft_trans_commit_list_add_tail(ctx->net, trans);
7161
7162         return 0;
7163
7164 err_free_trans:
7165         kfree(trans);
7166 err_trans:
7167         module_put(type->owner);
7168         return err;
7169 }
7170
7171 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7172                             const struct nlattr * const nla[])
7173 {
7174         struct netlink_ext_ack *extack = info->extack;
7175         u8 genmask = nft_genmask_next(info->net);
7176         u8 family = info->nfmsg->nfgen_family;
7177         const struct nft_object_type *type;
7178         struct net *net = info->net;
7179         struct nft_table *table;
7180         struct nft_object *obj;
7181         struct nft_ctx ctx;
7182         u32 objtype;
7183         int err;
7184
7185         if (!nla[NFTA_OBJ_TYPE] ||
7186             !nla[NFTA_OBJ_NAME] ||
7187             !nla[NFTA_OBJ_DATA])
7188                 return -EINVAL;
7189
7190         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7191                                  NETLINK_CB(skb).portid);
7192         if (IS_ERR(table)) {
7193                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7194                 return PTR_ERR(table);
7195         }
7196
7197         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7198         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7199         if (IS_ERR(obj)) {
7200                 err = PTR_ERR(obj);
7201                 if (err != -ENOENT) {
7202                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7203                         return err;
7204                 }
7205         } else {
7206                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7207                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7208                         return -EEXIST;
7209                 }
7210                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7211                         return -EOPNOTSUPP;
7212
7213                 type = __nft_obj_type_get(objtype);
7214                 if (WARN_ON_ONCE(!type))
7215                         return -ENOENT;
7216
7217                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7218
7219                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7220         }
7221
7222         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7223
7224         type = nft_obj_type_get(net, objtype);
7225         if (IS_ERR(type))
7226                 return PTR_ERR(type);
7227
7228         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7229         if (IS_ERR(obj)) {
7230                 err = PTR_ERR(obj);
7231                 goto err_init;
7232         }
7233         obj->key.table = table;
7234         obj->handle = nf_tables_alloc_handle(table);
7235
7236         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7237         if (!obj->key.name) {
7238                 err = -ENOMEM;
7239                 goto err_strdup;
7240         }
7241
7242         if (nla[NFTA_OBJ_USERDATA]) {
7243                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7244                 if (obj->udata == NULL)
7245                         goto err_userdata;
7246
7247                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7248         }
7249
7250         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7251         if (err < 0)
7252                 goto err_trans;
7253
7254         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7255                               nft_objname_ht_params);
7256         if (err < 0)
7257                 goto err_obj_ht;
7258
7259         list_add_tail_rcu(&obj->list, &table->objects);
7260         table->use++;
7261         return 0;
7262 err_obj_ht:
7263         /* queued in transaction log */
7264         INIT_LIST_HEAD(&obj->list);
7265         return err;
7266 err_trans:
7267         kfree(obj->udata);
7268 err_userdata:
7269         kfree(obj->key.name);
7270 err_strdup:
7271         if (obj->ops->destroy)
7272                 obj->ops->destroy(&ctx, obj);
7273         kfree(obj);
7274 err_init:
7275         module_put(type->owner);
7276         return err;
7277 }
7278
7279 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7280                                    u32 portid, u32 seq, int event, u32 flags,
7281                                    int family, const struct nft_table *table,
7282                                    struct nft_object *obj, bool reset)
7283 {
7284         struct nlmsghdr *nlh;
7285
7286         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7287         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7288                            NFNETLINK_V0, nft_base_seq(net));
7289         if (!nlh)
7290                 goto nla_put_failure;
7291
7292         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7293             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7294             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7295             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7296             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
7297             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7298                          NFTA_OBJ_PAD))
7299                 goto nla_put_failure;
7300
7301         if (obj->udata &&
7302             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7303                 goto nla_put_failure;
7304
7305         nlmsg_end(skb, nlh);
7306         return 0;
7307
7308 nla_put_failure:
7309         nlmsg_trim(skb, nlh);
7310         return -1;
7311 }
7312
7313 struct nft_obj_filter {
7314         char            *table;
7315         u32             type;
7316 };
7317
7318 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7319 {
7320         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7321         const struct nft_table *table;
7322         unsigned int idx = 0, s_idx = cb->args[0];
7323         struct nft_obj_filter *filter = cb->data;
7324         struct net *net = sock_net(skb->sk);
7325         int family = nfmsg->nfgen_family;
7326         struct nftables_pernet *nft_net;
7327         struct nft_object *obj;
7328         bool reset = false;
7329
7330         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7331                 reset = true;
7332
7333         rcu_read_lock();
7334         nft_net = nft_pernet(net);
7335         cb->seq = READ_ONCE(nft_net->base_seq);
7336
7337         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7338                 if (family != NFPROTO_UNSPEC && family != table->family)
7339                         continue;
7340
7341                 list_for_each_entry_rcu(obj, &table->objects, list) {
7342                         if (!nft_is_active(net, obj))
7343                                 goto cont;
7344                         if (idx < s_idx)
7345                                 goto cont;
7346                         if (idx > s_idx)
7347                                 memset(&cb->args[1], 0,
7348                                        sizeof(cb->args) - sizeof(cb->args[0]));
7349                         if (filter && filter->table &&
7350                             strcmp(filter->table, table->name))
7351                                 goto cont;
7352                         if (filter &&
7353                             filter->type != NFT_OBJECT_UNSPEC &&
7354                             obj->ops->type->type != filter->type)
7355                                 goto cont;
7356                         if (reset) {
7357                                 char *buf = kasprintf(GFP_ATOMIC,
7358                                                       "%s:%u",
7359                                                       table->name,
7360                                                       nft_net->base_seq);
7361
7362                                 audit_log_nfcfg(buf,
7363                                                 family,
7364                                                 obj->handle,
7365                                                 AUDIT_NFT_OP_OBJ_RESET,
7366                                                 GFP_ATOMIC);
7367                                 kfree(buf);
7368                         }
7369
7370                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7371                                                     cb->nlh->nlmsg_seq,
7372                                                     NFT_MSG_NEWOBJ,
7373                                                     NLM_F_MULTI | NLM_F_APPEND,
7374                                                     table->family, table,
7375                                                     obj, reset) < 0)
7376                                 goto done;
7377
7378                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7379 cont:
7380                         idx++;
7381                 }
7382         }
7383 done:
7384         rcu_read_unlock();
7385
7386         cb->args[0] = idx;
7387         return skb->len;
7388 }
7389
7390 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7391 {
7392         const struct nlattr * const *nla = cb->data;
7393         struct nft_obj_filter *filter = NULL;
7394
7395         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7396                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7397                 if (!filter)
7398                         return -ENOMEM;
7399
7400                 if (nla[NFTA_OBJ_TABLE]) {
7401                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7402                         if (!filter->table) {
7403                                 kfree(filter);
7404                                 return -ENOMEM;
7405                         }
7406                 }
7407
7408                 if (nla[NFTA_OBJ_TYPE])
7409                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7410         }
7411
7412         cb->data = filter;
7413         return 0;
7414 }
7415
7416 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7417 {
7418         struct nft_obj_filter *filter = cb->data;
7419
7420         if (filter) {
7421                 kfree(filter->table);
7422                 kfree(filter);
7423         }
7424
7425         return 0;
7426 }
7427
7428 /* called with rcu_read_lock held */
7429 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7430                             const struct nlattr * const nla[])
7431 {
7432         struct netlink_ext_ack *extack = info->extack;
7433         u8 genmask = nft_genmask_cur(info->net);
7434         u8 family = info->nfmsg->nfgen_family;
7435         const struct nft_table *table;
7436         struct net *net = info->net;
7437         struct nft_object *obj;
7438         struct sk_buff *skb2;
7439         bool reset = false;
7440         u32 objtype;
7441         int err;
7442
7443         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7444                 struct netlink_dump_control c = {
7445                         .start = nf_tables_dump_obj_start,
7446                         .dump = nf_tables_dump_obj,
7447                         .done = nf_tables_dump_obj_done,
7448                         .module = THIS_MODULE,
7449                         .data = (void *)nla,
7450                 };
7451
7452                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7453         }
7454
7455         if (!nla[NFTA_OBJ_NAME] ||
7456             !nla[NFTA_OBJ_TYPE])
7457                 return -EINVAL;
7458
7459         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7460         if (IS_ERR(table)) {
7461                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7462                 return PTR_ERR(table);
7463         }
7464
7465         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7466         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7467         if (IS_ERR(obj)) {
7468                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7469                 return PTR_ERR(obj);
7470         }
7471
7472         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7473         if (!skb2)
7474                 return -ENOMEM;
7475
7476         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7477                 reset = true;
7478
7479         if (reset) {
7480                 const struct nftables_pernet *nft_net;
7481                 char *buf;
7482
7483                 nft_net = nft_pernet(net);
7484                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7485
7486                 audit_log_nfcfg(buf,
7487                                 family,
7488                                 obj->handle,
7489                                 AUDIT_NFT_OP_OBJ_RESET,
7490                                 GFP_ATOMIC);
7491                 kfree(buf);
7492         }
7493
7494         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7495                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7496                                       family, table, obj, reset);
7497         if (err < 0)
7498                 goto err_fill_obj_info;
7499
7500         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7501
7502 err_fill_obj_info:
7503         kfree_skb(skb2);
7504         return err;
7505 }
7506
7507 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7508 {
7509         if (obj->ops->destroy)
7510                 obj->ops->destroy(ctx, obj);
7511
7512         module_put(obj->ops->type->owner);
7513         kfree(obj->key.name);
7514         kfree(obj->udata);
7515         kfree(obj);
7516 }
7517
7518 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7519                             const struct nlattr * const nla[])
7520 {
7521         struct netlink_ext_ack *extack = info->extack;
7522         u8 genmask = nft_genmask_next(info->net);
7523         u8 family = info->nfmsg->nfgen_family;
7524         struct net *net = info->net;
7525         const struct nlattr *attr;
7526         struct nft_table *table;
7527         struct nft_object *obj;
7528         struct nft_ctx ctx;
7529         u32 objtype;
7530
7531         if (!nla[NFTA_OBJ_TYPE] ||
7532             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7533                 return -EINVAL;
7534
7535         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7536                                  NETLINK_CB(skb).portid);
7537         if (IS_ERR(table)) {
7538                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7539                 return PTR_ERR(table);
7540         }
7541
7542         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7543         if (nla[NFTA_OBJ_HANDLE]) {
7544                 attr = nla[NFTA_OBJ_HANDLE];
7545                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7546         } else {
7547                 attr = nla[NFTA_OBJ_NAME];
7548                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7549         }
7550
7551         if (IS_ERR(obj)) {
7552                 NL_SET_BAD_ATTR(extack, attr);
7553                 return PTR_ERR(obj);
7554         }
7555         if (obj->use > 0) {
7556                 NL_SET_BAD_ATTR(extack, attr);
7557                 return -EBUSY;
7558         }
7559
7560         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7561
7562         return nft_delobj(&ctx, obj);
7563 }
7564
7565 void nft_obj_notify(struct net *net, const struct nft_table *table,
7566                     struct nft_object *obj, u32 portid, u32 seq, int event,
7567                     u16 flags, int family, int report, gfp_t gfp)
7568 {
7569         struct nftables_pernet *nft_net = nft_pernet(net);
7570         struct sk_buff *skb;
7571         int err;
7572         char *buf = kasprintf(gfp, "%s:%u",
7573                               table->name, nft_net->base_seq);
7574
7575         audit_log_nfcfg(buf,
7576                         family,
7577                         obj->handle,
7578                         event == NFT_MSG_NEWOBJ ?
7579                                  AUDIT_NFT_OP_OBJ_REGISTER :
7580                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7581                         gfp);
7582         kfree(buf);
7583
7584         if (!report &&
7585             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7586                 return;
7587
7588         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7589         if (skb == NULL)
7590                 goto err;
7591
7592         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7593                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7594                                       family, table, obj, false);
7595         if (err < 0) {
7596                 kfree_skb(skb);
7597                 goto err;
7598         }
7599
7600         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7601         return;
7602 err:
7603         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7604 }
7605 EXPORT_SYMBOL_GPL(nft_obj_notify);
7606
7607 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7608                                  struct nft_object *obj, int event)
7609 {
7610         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7611                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7612 }
7613
7614 /*
7615  * Flow tables
7616  */
7617 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7618 {
7619         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7620         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7621         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7622 }
7623 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7624
7625 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7626 {
7627         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7628         list_del_rcu(&type->list);
7629         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7630 }
7631 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7632
7633 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7634         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7635                                             .len = NFT_NAME_MAXLEN - 1 },
7636         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7637                                             .len = NFT_NAME_MAXLEN - 1 },
7638         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7639         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7640         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7641 };
7642
7643 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7644                                            const struct nlattr *nla, u8 genmask)
7645 {
7646         struct nft_flowtable *flowtable;
7647
7648         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7649                 if (!nla_strcmp(nla, flowtable->name) &&
7650                     nft_active_genmask(flowtable, genmask))
7651                         return flowtable;
7652         }
7653         return ERR_PTR(-ENOENT);
7654 }
7655 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7656
7657 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7658                                     struct nft_flowtable *flowtable,
7659                                     enum nft_trans_phase phase)
7660 {
7661         switch (phase) {
7662         case NFT_TRANS_PREPARE_ERROR:
7663         case NFT_TRANS_PREPARE:
7664         case NFT_TRANS_ABORT:
7665         case NFT_TRANS_RELEASE:
7666                 flowtable->use--;
7667                 fallthrough;
7668         default:
7669                 return;
7670         }
7671 }
7672 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7673
7674 static struct nft_flowtable *
7675 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7676                               const struct nlattr *nla, u8 genmask)
7677 {
7678        struct nft_flowtable *flowtable;
7679
7680        list_for_each_entry(flowtable, &table->flowtables, list) {
7681                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7682                    nft_active_genmask(flowtable, genmask))
7683                        return flowtable;
7684        }
7685        return ERR_PTR(-ENOENT);
7686 }
7687
7688 struct nft_flowtable_hook {
7689         u32                     num;
7690         int                     priority;
7691         struct list_head        list;
7692 };
7693
7694 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7695         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7696         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7697         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7698 };
7699
7700 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7701                                     const struct nlattr *attr,
7702                                     struct nft_flowtable_hook *flowtable_hook,
7703                                     struct nft_flowtable *flowtable, bool add)
7704 {
7705         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7706         struct nft_hook *hook;
7707         int hooknum, priority;
7708         int err;
7709
7710         INIT_LIST_HEAD(&flowtable_hook->list);
7711
7712         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7713                                           nft_flowtable_hook_policy, NULL);
7714         if (err < 0)
7715                 return err;
7716
7717         if (add) {
7718                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7719                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7720                         return -EINVAL;
7721
7722                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7723                 if (hooknum != NF_NETDEV_INGRESS)
7724                         return -EOPNOTSUPP;
7725
7726                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7727
7728                 flowtable_hook->priority        = priority;
7729                 flowtable_hook->num             = hooknum;
7730         } else {
7731                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7732                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7733                         if (hooknum != flowtable->hooknum)
7734                                 return -EOPNOTSUPP;
7735                 }
7736
7737                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7738                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7739                         if (priority != flowtable->data.priority)
7740                                 return -EOPNOTSUPP;
7741                 }
7742
7743                 flowtable_hook->priority        = flowtable->data.priority;
7744                 flowtable_hook->num             = flowtable->hooknum;
7745         }
7746
7747         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7748                 err = nf_tables_parse_netdev_hooks(ctx->net,
7749                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7750                                                    &flowtable_hook->list);
7751                 if (err < 0)
7752                         return err;
7753         }
7754
7755         list_for_each_entry(hook, &flowtable_hook->list, list) {
7756                 hook->ops.pf            = NFPROTO_NETDEV;
7757                 hook->ops.hooknum       = flowtable_hook->num;
7758                 hook->ops.priority      = flowtable_hook->priority;
7759                 hook->ops.priv          = &flowtable->data;
7760                 hook->ops.hook          = flowtable->data.type->hook;
7761         }
7762
7763         return err;
7764 }
7765
7766 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7767 {
7768         const struct nf_flowtable_type *type;
7769
7770         list_for_each_entry(type, &nf_tables_flowtables, list) {
7771                 if (family == type->family)
7772                         return type;
7773         }
7774         return NULL;
7775 }
7776
7777 static const struct nf_flowtable_type *
7778 nft_flowtable_type_get(struct net *net, u8 family)
7779 {
7780         const struct nf_flowtable_type *type;
7781
7782         type = __nft_flowtable_type_get(family);
7783         if (type != NULL && try_module_get(type->owner))
7784                 return type;
7785
7786         lockdep_nfnl_nft_mutex_not_held();
7787 #ifdef CONFIG_MODULES
7788         if (type == NULL) {
7789                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7790                         return ERR_PTR(-EAGAIN);
7791         }
7792 #endif
7793         return ERR_PTR(-ENOENT);
7794 }
7795
7796 /* Only called from error and netdev event paths. */
7797 static void nft_unregister_flowtable_hook(struct net *net,
7798                                           struct nft_flowtable *flowtable,
7799                                           struct nft_hook *hook)
7800 {
7801         nf_unregister_net_hook(net, &hook->ops);
7802         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7803                                     FLOW_BLOCK_UNBIND);
7804 }
7805
7806 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7807                                                  struct list_head *hook_list,
7808                                                  bool release_netdev)
7809 {
7810         struct nft_hook *hook, *next;
7811
7812         list_for_each_entry_safe(hook, next, hook_list, list) {
7813                 nf_unregister_net_hook(net, &hook->ops);
7814                 if (release_netdev) {
7815                         list_del(&hook->list);
7816                         kfree_rcu(hook, rcu);
7817                 }
7818         }
7819 }
7820
7821 static void nft_unregister_flowtable_net_hooks(struct net *net,
7822                                                struct list_head *hook_list)
7823 {
7824         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7825 }
7826
7827 static int nft_register_flowtable_net_hooks(struct net *net,
7828                                             struct nft_table *table,
7829                                             struct list_head *hook_list,
7830                                             struct nft_flowtable *flowtable)
7831 {
7832         struct nft_hook *hook, *hook2, *next;
7833         struct nft_flowtable *ft;
7834         int err, i = 0;
7835
7836         list_for_each_entry(hook, hook_list, list) {
7837                 list_for_each_entry(ft, &table->flowtables, list) {
7838                         if (!nft_is_active_next(net, ft))
7839                                 continue;
7840
7841                         list_for_each_entry(hook2, &ft->hook_list, list) {
7842                                 if (hook->ops.dev == hook2->ops.dev &&
7843                                     hook->ops.pf == hook2->ops.pf) {
7844                                         err = -EEXIST;
7845                                         goto err_unregister_net_hooks;
7846                                 }
7847                         }
7848                 }
7849
7850                 err = flowtable->data.type->setup(&flowtable->data,
7851                                                   hook->ops.dev,
7852                                                   FLOW_BLOCK_BIND);
7853                 if (err < 0)
7854                         goto err_unregister_net_hooks;
7855
7856                 err = nf_register_net_hook(net, &hook->ops);
7857                 if (err < 0) {
7858                         flowtable->data.type->setup(&flowtable->data,
7859                                                     hook->ops.dev,
7860                                                     FLOW_BLOCK_UNBIND);
7861                         goto err_unregister_net_hooks;
7862                 }
7863
7864                 i++;
7865         }
7866
7867         return 0;
7868
7869 err_unregister_net_hooks:
7870         list_for_each_entry_safe(hook, next, hook_list, list) {
7871                 if (i-- <= 0)
7872                         break;
7873
7874                 nft_unregister_flowtable_hook(net, flowtable, hook);
7875                 list_del_rcu(&hook->list);
7876                 kfree_rcu(hook, rcu);
7877         }
7878
7879         return err;
7880 }
7881
7882 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7883 {
7884         struct nft_hook *hook, *next;
7885
7886         list_for_each_entry_safe(hook, next, hook_list, list) {
7887                 list_del_rcu(&hook->list);
7888                 kfree_rcu(hook, rcu);
7889         }
7890 }
7891
7892 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7893                                 struct nft_flowtable *flowtable)
7894 {
7895         const struct nlattr * const *nla = ctx->nla;
7896         struct nft_flowtable_hook flowtable_hook;
7897         struct nft_hook *hook, *next;
7898         struct nft_trans *trans;
7899         bool unregister = false;
7900         u32 flags;
7901         int err;
7902
7903         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7904                                        &flowtable_hook, flowtable, false);
7905         if (err < 0)
7906                 return err;
7907
7908         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7909                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7910                         list_del(&hook->list);
7911                         kfree(hook);
7912                 }
7913         }
7914
7915         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7916                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7917                 if (flags & ~NFT_FLOWTABLE_MASK) {
7918                         err = -EOPNOTSUPP;
7919                         goto err_flowtable_update_hook;
7920                 }
7921                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7922                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7923                         err = -EOPNOTSUPP;
7924                         goto err_flowtable_update_hook;
7925                 }
7926         } else {
7927                 flags = flowtable->data.flags;
7928         }
7929
7930         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7931                                                &flowtable_hook.list, flowtable);
7932         if (err < 0)
7933                 goto err_flowtable_update_hook;
7934
7935         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7936                                 sizeof(struct nft_trans_flowtable));
7937         if (!trans) {
7938                 unregister = true;
7939                 err = -ENOMEM;
7940                 goto err_flowtable_update_hook;
7941         }
7942
7943         nft_trans_flowtable_flags(trans) = flags;
7944         nft_trans_flowtable(trans) = flowtable;
7945         nft_trans_flowtable_update(trans) = true;
7946         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7947         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7948
7949         nft_trans_commit_list_add_tail(ctx->net, trans);
7950
7951         return 0;
7952
7953 err_flowtable_update_hook:
7954         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7955                 if (unregister)
7956                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7957                 list_del_rcu(&hook->list);
7958                 kfree_rcu(hook, rcu);
7959         }
7960
7961         return err;
7962
7963 }
7964
7965 static int nf_tables_newflowtable(struct sk_buff *skb,
7966                                   const struct nfnl_info *info,
7967                                   const struct nlattr * const nla[])
7968 {
7969         struct netlink_ext_ack *extack = info->extack;
7970         struct nft_flowtable_hook flowtable_hook;
7971         u8 genmask = nft_genmask_next(info->net);
7972         u8 family = info->nfmsg->nfgen_family;
7973         const struct nf_flowtable_type *type;
7974         struct nft_flowtable *flowtable;
7975         struct nft_hook *hook, *next;
7976         struct net *net = info->net;
7977         struct nft_table *table;
7978         struct nft_ctx ctx;
7979         int err;
7980
7981         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7982             !nla[NFTA_FLOWTABLE_NAME] ||
7983             !nla[NFTA_FLOWTABLE_HOOK])
7984                 return -EINVAL;
7985
7986         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7987                                  genmask, NETLINK_CB(skb).portid);
7988         if (IS_ERR(table)) {
7989                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7990                 return PTR_ERR(table);
7991         }
7992
7993         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7994                                          genmask);
7995         if (IS_ERR(flowtable)) {
7996                 err = PTR_ERR(flowtable);
7997                 if (err != -ENOENT) {
7998                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7999                         return err;
8000                 }
8001         } else {
8002                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8003                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8004                         return -EEXIST;
8005                 }
8006
8007                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8008
8009                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
8010         }
8011
8012         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8013
8014         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8015         if (!flowtable)
8016                 return -ENOMEM;
8017
8018         flowtable->table = table;
8019         flowtable->handle = nf_tables_alloc_handle(table);
8020         INIT_LIST_HEAD(&flowtable->hook_list);
8021
8022         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8023         if (!flowtable->name) {
8024                 err = -ENOMEM;
8025                 goto err1;
8026         }
8027
8028         type = nft_flowtable_type_get(net, family);
8029         if (IS_ERR(type)) {
8030                 err = PTR_ERR(type);
8031                 goto err2;
8032         }
8033
8034         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8035                 flowtable->data.flags =
8036                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8037                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8038                         err = -EOPNOTSUPP;
8039                         goto err3;
8040                 }
8041         }
8042
8043         write_pnet(&flowtable->data.net, net);
8044         flowtable->data.type = type;
8045         err = type->init(&flowtable->data);
8046         if (err < 0)
8047                 goto err3;
8048
8049         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
8050                                        &flowtable_hook, flowtable, true);
8051         if (err < 0)
8052                 goto err4;
8053
8054         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8055         flowtable->data.priority = flowtable_hook.priority;
8056         flowtable->hooknum = flowtable_hook.num;
8057
8058         err = nft_register_flowtable_net_hooks(ctx.net, table,
8059                                                &flowtable->hook_list,
8060                                                flowtable);
8061         if (err < 0) {
8062                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
8063                 goto err4;
8064         }
8065
8066         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8067         if (err < 0)
8068                 goto err5;
8069
8070         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8071         table->use++;
8072
8073         return 0;
8074 err5:
8075         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8076                 nft_unregister_flowtable_hook(net, flowtable, hook);
8077                 list_del_rcu(&hook->list);
8078                 kfree_rcu(hook, rcu);
8079         }
8080 err4:
8081         flowtable->data.type->free(&flowtable->data);
8082 err3:
8083         module_put(type->owner);
8084 err2:
8085         kfree(flowtable->name);
8086 err1:
8087         kfree(flowtable);
8088         return err;
8089 }
8090
8091 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8092 {
8093         struct nft_hook *this, *next;
8094
8095         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8096                 list_del(&this->list);
8097                 kfree(this);
8098         }
8099 }
8100
8101 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8102                                  struct nft_flowtable *flowtable)
8103 {
8104         const struct nlattr * const *nla = ctx->nla;
8105         struct nft_flowtable_hook flowtable_hook;
8106         LIST_HEAD(flowtable_del_list);
8107         struct nft_hook *this, *hook;
8108         struct nft_trans *trans;
8109         int err;
8110
8111         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
8112                                        &flowtable_hook, flowtable, false);
8113         if (err < 0)
8114                 return err;
8115
8116         list_for_each_entry(this, &flowtable_hook.list, list) {
8117                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8118                 if (!hook) {
8119                         err = -ENOENT;
8120                         goto err_flowtable_del_hook;
8121                 }
8122                 list_move(&hook->list, &flowtable_del_list);
8123         }
8124
8125         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8126                                 sizeof(struct nft_trans_flowtable));
8127         if (!trans) {
8128                 err = -ENOMEM;
8129                 goto err_flowtable_del_hook;
8130         }
8131
8132         nft_trans_flowtable(trans) = flowtable;
8133         nft_trans_flowtable_update(trans) = true;
8134         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8135         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8136         nft_flowtable_hook_release(&flowtable_hook);
8137
8138         nft_trans_commit_list_add_tail(ctx->net, trans);
8139
8140         return 0;
8141
8142 err_flowtable_del_hook:
8143         list_splice(&flowtable_del_list, &flowtable->hook_list);
8144         nft_flowtable_hook_release(&flowtable_hook);
8145
8146         return err;
8147 }
8148
8149 static int nf_tables_delflowtable(struct sk_buff *skb,
8150                                   const struct nfnl_info *info,
8151                                   const struct nlattr * const nla[])
8152 {
8153         struct netlink_ext_ack *extack = info->extack;
8154         u8 genmask = nft_genmask_next(info->net);
8155         u8 family = info->nfmsg->nfgen_family;
8156         struct nft_flowtable *flowtable;
8157         struct net *net = info->net;
8158         const struct nlattr *attr;
8159         struct nft_table *table;
8160         struct nft_ctx ctx;
8161
8162         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8163             (!nla[NFTA_FLOWTABLE_NAME] &&
8164              !nla[NFTA_FLOWTABLE_HANDLE]))
8165                 return -EINVAL;
8166
8167         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8168                                  genmask, NETLINK_CB(skb).portid);
8169         if (IS_ERR(table)) {
8170                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8171                 return PTR_ERR(table);
8172         }
8173
8174         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8175                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8176                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8177         } else {
8178                 attr = nla[NFTA_FLOWTABLE_NAME];
8179                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8180         }
8181
8182         if (IS_ERR(flowtable)) {
8183                 NL_SET_BAD_ATTR(extack, attr);
8184                 return PTR_ERR(flowtable);
8185         }
8186
8187         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8188
8189         if (nla[NFTA_FLOWTABLE_HOOK])
8190                 return nft_delflowtable_hook(&ctx, flowtable);
8191
8192         if (flowtable->use > 0) {
8193                 NL_SET_BAD_ATTR(extack, attr);
8194                 return -EBUSY;
8195         }
8196
8197         return nft_delflowtable(&ctx, flowtable);
8198 }
8199
8200 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8201                                          u32 portid, u32 seq, int event,
8202                                          u32 flags, int family,
8203                                          struct nft_flowtable *flowtable,
8204                                          struct list_head *hook_list)
8205 {
8206         struct nlattr *nest, *nest_devs;
8207         struct nft_hook *hook;
8208         struct nlmsghdr *nlh;
8209
8210         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8211         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8212                            NFNETLINK_V0, nft_base_seq(net));
8213         if (!nlh)
8214                 goto nla_put_failure;
8215
8216         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8217             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8218             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8219             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8220                          NFTA_FLOWTABLE_PAD) ||
8221             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8222                 goto nla_put_failure;
8223
8224         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8225         if (!nest)
8226                 goto nla_put_failure;
8227         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8228             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8229                 goto nla_put_failure;
8230
8231         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8232         if (!nest_devs)
8233                 goto nla_put_failure;
8234
8235         list_for_each_entry_rcu(hook, hook_list, list) {
8236                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8237                         goto nla_put_failure;
8238         }
8239         nla_nest_end(skb, nest_devs);
8240         nla_nest_end(skb, nest);
8241
8242         nlmsg_end(skb, nlh);
8243         return 0;
8244
8245 nla_put_failure:
8246         nlmsg_trim(skb, nlh);
8247         return -1;
8248 }
8249
8250 struct nft_flowtable_filter {
8251         char            *table;
8252 };
8253
8254 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8255                                     struct netlink_callback *cb)
8256 {
8257         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8258         struct nft_flowtable_filter *filter = cb->data;
8259         unsigned int idx = 0, s_idx = cb->args[0];
8260         struct net *net = sock_net(skb->sk);
8261         int family = nfmsg->nfgen_family;
8262         struct nft_flowtable *flowtable;
8263         struct nftables_pernet *nft_net;
8264         const struct nft_table *table;
8265
8266         rcu_read_lock();
8267         nft_net = nft_pernet(net);
8268         cb->seq = READ_ONCE(nft_net->base_seq);
8269
8270         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8271                 if (family != NFPROTO_UNSPEC && family != table->family)
8272                         continue;
8273
8274                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8275                         if (!nft_is_active(net, flowtable))
8276                                 goto cont;
8277                         if (idx < s_idx)
8278                                 goto cont;
8279                         if (idx > s_idx)
8280                                 memset(&cb->args[1], 0,
8281                                        sizeof(cb->args) - sizeof(cb->args[0]));
8282                         if (filter && filter->table &&
8283                             strcmp(filter->table, table->name))
8284                                 goto cont;
8285
8286                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8287                                                           cb->nlh->nlmsg_seq,
8288                                                           NFT_MSG_NEWFLOWTABLE,
8289                                                           NLM_F_MULTI | NLM_F_APPEND,
8290                                                           table->family,
8291                                                           flowtable,
8292                                                           &flowtable->hook_list) < 0)
8293                                 goto done;
8294
8295                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8296 cont:
8297                         idx++;
8298                 }
8299         }
8300 done:
8301         rcu_read_unlock();
8302
8303         cb->args[0] = idx;
8304         return skb->len;
8305 }
8306
8307 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8308 {
8309         const struct nlattr * const *nla = cb->data;
8310         struct nft_flowtable_filter *filter = NULL;
8311
8312         if (nla[NFTA_FLOWTABLE_TABLE]) {
8313                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8314                 if (!filter)
8315                         return -ENOMEM;
8316
8317                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8318                                            GFP_ATOMIC);
8319                 if (!filter->table) {
8320                         kfree(filter);
8321                         return -ENOMEM;
8322                 }
8323         }
8324
8325         cb->data = filter;
8326         return 0;
8327 }
8328
8329 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8330 {
8331         struct nft_flowtable_filter *filter = cb->data;
8332
8333         if (!filter)
8334                 return 0;
8335
8336         kfree(filter->table);
8337         kfree(filter);
8338
8339         return 0;
8340 }
8341
8342 /* called with rcu_read_lock held */
8343 static int nf_tables_getflowtable(struct sk_buff *skb,
8344                                   const struct nfnl_info *info,
8345                                   const struct nlattr * const nla[])
8346 {
8347         u8 genmask = nft_genmask_cur(info->net);
8348         u8 family = info->nfmsg->nfgen_family;
8349         struct nft_flowtable *flowtable;
8350         const struct nft_table *table;
8351         struct net *net = info->net;
8352         struct sk_buff *skb2;
8353         int err;
8354
8355         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8356                 struct netlink_dump_control c = {
8357                         .start = nf_tables_dump_flowtable_start,
8358                         .dump = nf_tables_dump_flowtable,
8359                         .done = nf_tables_dump_flowtable_done,
8360                         .module = THIS_MODULE,
8361                         .data = (void *)nla,
8362                 };
8363
8364                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8365         }
8366
8367         if (!nla[NFTA_FLOWTABLE_NAME])
8368                 return -EINVAL;
8369
8370         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8371                                  genmask, 0);
8372         if (IS_ERR(table))
8373                 return PTR_ERR(table);
8374
8375         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8376                                          genmask);
8377         if (IS_ERR(flowtable))
8378                 return PTR_ERR(flowtable);
8379
8380         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8381         if (!skb2)
8382                 return -ENOMEM;
8383
8384         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8385                                             info->nlh->nlmsg_seq,
8386                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8387                                             flowtable, &flowtable->hook_list);
8388         if (err < 0)
8389                 goto err_fill_flowtable_info;
8390
8391         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8392
8393 err_fill_flowtable_info:
8394         kfree_skb(skb2);
8395         return err;
8396 }
8397
8398 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8399                                        struct nft_flowtable *flowtable,
8400                                        struct list_head *hook_list,
8401                                        int event)
8402 {
8403         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8404         struct sk_buff *skb;
8405         u16 flags = 0;
8406         int err;
8407
8408         if (!ctx->report &&
8409             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8410                 return;
8411
8412         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8413         if (skb == NULL)
8414                 goto err;
8415
8416         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8417                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8418
8419         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8420                                             ctx->seq, event, flags,
8421                                             ctx->family, flowtable, hook_list);
8422         if (err < 0) {
8423                 kfree_skb(skb);
8424                 goto err;
8425         }
8426
8427         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8428         return;
8429 err:
8430         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8431 }
8432
8433 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8434 {
8435         struct nft_hook *hook, *next;
8436
8437         flowtable->data.type->free(&flowtable->data);
8438         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8439                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8440                                             FLOW_BLOCK_UNBIND);
8441                 list_del_rcu(&hook->list);
8442                 kfree(hook);
8443         }
8444         kfree(flowtable->name);
8445         module_put(flowtable->data.type->owner);
8446         kfree(flowtable);
8447 }
8448
8449 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8450                                    u32 portid, u32 seq)
8451 {
8452         struct nftables_pernet *nft_net = nft_pernet(net);
8453         struct nlmsghdr *nlh;
8454         char buf[TASK_COMM_LEN];
8455         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8456
8457         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8458                            NFNETLINK_V0, nft_base_seq(net));
8459         if (!nlh)
8460                 goto nla_put_failure;
8461
8462         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8463             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8464             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8465                 goto nla_put_failure;
8466
8467         nlmsg_end(skb, nlh);
8468         return 0;
8469
8470 nla_put_failure:
8471         nlmsg_trim(skb, nlh);
8472         return -EMSGSIZE;
8473 }
8474
8475 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8476                                 struct nft_flowtable *flowtable)
8477 {
8478         struct nft_hook *hook;
8479
8480         list_for_each_entry(hook, &flowtable->hook_list, list) {
8481                 if (hook->ops.dev != dev)
8482                         continue;
8483
8484                 /* flow_offload_netdev_event() cleans up entries for us. */
8485                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8486                 list_del_rcu(&hook->list);
8487                 kfree_rcu(hook, rcu);
8488                 break;
8489         }
8490 }
8491
8492 static int nf_tables_flowtable_event(struct notifier_block *this,
8493                                      unsigned long event, void *ptr)
8494 {
8495         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8496         struct nft_flowtable *flowtable;
8497         struct nftables_pernet *nft_net;
8498         struct nft_table *table;
8499         struct net *net;
8500
8501         if (event != NETDEV_UNREGISTER)
8502                 return 0;
8503
8504         net = dev_net(dev);
8505         nft_net = nft_pernet(net);
8506         mutex_lock(&nft_net->commit_mutex);
8507         list_for_each_entry(table, &nft_net->tables, list) {
8508                 list_for_each_entry(flowtable, &table->flowtables, list) {
8509                         nft_flowtable_event(event, dev, flowtable);
8510                 }
8511         }
8512         mutex_unlock(&nft_net->commit_mutex);
8513
8514         return NOTIFY_DONE;
8515 }
8516
8517 static struct notifier_block nf_tables_flowtable_notifier = {
8518         .notifier_call  = nf_tables_flowtable_event,
8519 };
8520
8521 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8522                                  int event)
8523 {
8524         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8525         struct sk_buff *skb2;
8526         int err;
8527
8528         if (!nlmsg_report(nlh) &&
8529             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8530                 return;
8531
8532         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8533         if (skb2 == NULL)
8534                 goto err;
8535
8536         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8537                                       nlh->nlmsg_seq);
8538         if (err < 0) {
8539                 kfree_skb(skb2);
8540                 goto err;
8541         }
8542
8543         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8544                        nlmsg_report(nlh), GFP_KERNEL);
8545         return;
8546 err:
8547         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8548                           -ENOBUFS);
8549 }
8550
8551 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8552                             const struct nlattr * const nla[])
8553 {
8554         struct sk_buff *skb2;
8555         int err;
8556
8557         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8558         if (skb2 == NULL)
8559                 return -ENOMEM;
8560
8561         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8562                                       info->nlh->nlmsg_seq);
8563         if (err < 0)
8564                 goto err_fill_gen_info;
8565
8566         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8567
8568 err_fill_gen_info:
8569         kfree_skb(skb2);
8570         return err;
8571 }
8572
8573 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8574         [NFT_MSG_NEWTABLE] = {
8575                 .call           = nf_tables_newtable,
8576                 .type           = NFNL_CB_BATCH,
8577                 .attr_count     = NFTA_TABLE_MAX,
8578                 .policy         = nft_table_policy,
8579         },
8580         [NFT_MSG_GETTABLE] = {
8581                 .call           = nf_tables_gettable,
8582                 .type           = NFNL_CB_RCU,
8583                 .attr_count     = NFTA_TABLE_MAX,
8584                 .policy         = nft_table_policy,
8585         },
8586         [NFT_MSG_DELTABLE] = {
8587                 .call           = nf_tables_deltable,
8588                 .type           = NFNL_CB_BATCH,
8589                 .attr_count     = NFTA_TABLE_MAX,
8590                 .policy         = nft_table_policy,
8591         },
8592         [NFT_MSG_NEWCHAIN] = {
8593                 .call           = nf_tables_newchain,
8594                 .type           = NFNL_CB_BATCH,
8595                 .attr_count     = NFTA_CHAIN_MAX,
8596                 .policy         = nft_chain_policy,
8597         },
8598         [NFT_MSG_GETCHAIN] = {
8599                 .call           = nf_tables_getchain,
8600                 .type           = NFNL_CB_RCU,
8601                 .attr_count     = NFTA_CHAIN_MAX,
8602                 .policy         = nft_chain_policy,
8603         },
8604         [NFT_MSG_DELCHAIN] = {
8605                 .call           = nf_tables_delchain,
8606                 .type           = NFNL_CB_BATCH,
8607                 .attr_count     = NFTA_CHAIN_MAX,
8608                 .policy         = nft_chain_policy,
8609         },
8610         [NFT_MSG_NEWRULE] = {
8611                 .call           = nf_tables_newrule,
8612                 .type           = NFNL_CB_BATCH,
8613                 .attr_count     = NFTA_RULE_MAX,
8614                 .policy         = nft_rule_policy,
8615         },
8616         [NFT_MSG_GETRULE] = {
8617                 .call           = nf_tables_getrule,
8618                 .type           = NFNL_CB_RCU,
8619                 .attr_count     = NFTA_RULE_MAX,
8620                 .policy         = nft_rule_policy,
8621         },
8622         [NFT_MSG_DELRULE] = {
8623                 .call           = nf_tables_delrule,
8624                 .type           = NFNL_CB_BATCH,
8625                 .attr_count     = NFTA_RULE_MAX,
8626                 .policy         = nft_rule_policy,
8627         },
8628         [NFT_MSG_NEWSET] = {
8629                 .call           = nf_tables_newset,
8630                 .type           = NFNL_CB_BATCH,
8631                 .attr_count     = NFTA_SET_MAX,
8632                 .policy         = nft_set_policy,
8633         },
8634         [NFT_MSG_GETSET] = {
8635                 .call           = nf_tables_getset,
8636                 .type           = NFNL_CB_RCU,
8637                 .attr_count     = NFTA_SET_MAX,
8638                 .policy         = nft_set_policy,
8639         },
8640         [NFT_MSG_DELSET] = {
8641                 .call           = nf_tables_delset,
8642                 .type           = NFNL_CB_BATCH,
8643                 .attr_count     = NFTA_SET_MAX,
8644                 .policy         = nft_set_policy,
8645         },
8646         [NFT_MSG_NEWSETELEM] = {
8647                 .call           = nf_tables_newsetelem,
8648                 .type           = NFNL_CB_BATCH,
8649                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8650                 .policy         = nft_set_elem_list_policy,
8651         },
8652         [NFT_MSG_GETSETELEM] = {
8653                 .call           = nf_tables_getsetelem,
8654                 .type           = NFNL_CB_RCU,
8655                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8656                 .policy         = nft_set_elem_list_policy,
8657         },
8658         [NFT_MSG_DELSETELEM] = {
8659                 .call           = nf_tables_delsetelem,
8660                 .type           = NFNL_CB_BATCH,
8661                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8662                 .policy         = nft_set_elem_list_policy,
8663         },
8664         [NFT_MSG_GETGEN] = {
8665                 .call           = nf_tables_getgen,
8666                 .type           = NFNL_CB_RCU,
8667         },
8668         [NFT_MSG_NEWOBJ] = {
8669                 .call           = nf_tables_newobj,
8670                 .type           = NFNL_CB_BATCH,
8671                 .attr_count     = NFTA_OBJ_MAX,
8672                 .policy         = nft_obj_policy,
8673         },
8674         [NFT_MSG_GETOBJ] = {
8675                 .call           = nf_tables_getobj,
8676                 .type           = NFNL_CB_RCU,
8677                 .attr_count     = NFTA_OBJ_MAX,
8678                 .policy         = nft_obj_policy,
8679         },
8680         [NFT_MSG_DELOBJ] = {
8681                 .call           = nf_tables_delobj,
8682                 .type           = NFNL_CB_BATCH,
8683                 .attr_count     = NFTA_OBJ_MAX,
8684                 .policy         = nft_obj_policy,
8685         },
8686         [NFT_MSG_GETOBJ_RESET] = {
8687                 .call           = nf_tables_getobj,
8688                 .type           = NFNL_CB_RCU,
8689                 .attr_count     = NFTA_OBJ_MAX,
8690                 .policy         = nft_obj_policy,
8691         },
8692         [NFT_MSG_NEWFLOWTABLE] = {
8693                 .call           = nf_tables_newflowtable,
8694                 .type           = NFNL_CB_BATCH,
8695                 .attr_count     = NFTA_FLOWTABLE_MAX,
8696                 .policy         = nft_flowtable_policy,
8697         },
8698         [NFT_MSG_GETFLOWTABLE] = {
8699                 .call           = nf_tables_getflowtable,
8700                 .type           = NFNL_CB_RCU,
8701                 .attr_count     = NFTA_FLOWTABLE_MAX,
8702                 .policy         = nft_flowtable_policy,
8703         },
8704         [NFT_MSG_DELFLOWTABLE] = {
8705                 .call           = nf_tables_delflowtable,
8706                 .type           = NFNL_CB_BATCH,
8707                 .attr_count     = NFTA_FLOWTABLE_MAX,
8708                 .policy         = nft_flowtable_policy,
8709         },
8710 };
8711
8712 static int nf_tables_validate(struct net *net)
8713 {
8714         struct nftables_pernet *nft_net = nft_pernet(net);
8715         struct nft_table *table;
8716
8717         switch (nft_net->validate_state) {
8718         case NFT_VALIDATE_SKIP:
8719                 break;
8720         case NFT_VALIDATE_NEED:
8721                 nft_validate_state_update(net, NFT_VALIDATE_DO);
8722                 fallthrough;
8723         case NFT_VALIDATE_DO:
8724                 list_for_each_entry(table, &nft_net->tables, list) {
8725                         if (nft_table_validate(net, table) < 0)
8726                                 return -EAGAIN;
8727                 }
8728
8729                 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8730                 break;
8731         }
8732
8733         return 0;
8734 }
8735
8736 /* a drop policy has to be deferred until all rules have been activated,
8737  * otherwise a large ruleset that contains a drop-policy base chain will
8738  * cause all packets to get dropped until the full transaction has been
8739  * processed.
8740  *
8741  * We defer the drop policy until the transaction has been finalized.
8742  */
8743 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8744 {
8745         struct nft_base_chain *basechain;
8746
8747         if (nft_trans_chain_policy(trans) != NF_DROP)
8748                 return;
8749
8750         if (!nft_is_base_chain(trans->ctx.chain))
8751                 return;
8752
8753         basechain = nft_base_chain(trans->ctx.chain);
8754         basechain->policy = NF_DROP;
8755 }
8756
8757 static void nft_chain_commit_update(struct nft_trans *trans)
8758 {
8759         struct nft_base_chain *basechain;
8760
8761         if (nft_trans_chain_name(trans)) {
8762                 rhltable_remove(&trans->ctx.table->chains_ht,
8763                                 &trans->ctx.chain->rhlhead,
8764                                 nft_chain_ht_params);
8765                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8766                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8767                                     trans->ctx.chain->name,
8768                                     &trans->ctx.chain->rhlhead,
8769                                     nft_chain_ht_params);
8770         }
8771
8772         if (!nft_is_base_chain(trans->ctx.chain))
8773                 return;
8774
8775         nft_chain_stats_replace(trans);
8776
8777         basechain = nft_base_chain(trans->ctx.chain);
8778
8779         switch (nft_trans_chain_policy(trans)) {
8780         case NF_DROP:
8781         case NF_ACCEPT:
8782                 basechain->policy = nft_trans_chain_policy(trans);
8783                 break;
8784         }
8785 }
8786
8787 static void nft_obj_commit_update(struct nft_trans *trans)
8788 {
8789         struct nft_object *newobj;
8790         struct nft_object *obj;
8791
8792         obj = nft_trans_obj(trans);
8793         newobj = nft_trans_obj_newobj(trans);
8794
8795         if (obj->ops->update)
8796                 obj->ops->update(obj, newobj);
8797
8798         nft_obj_destroy(&trans->ctx, newobj);
8799 }
8800
8801 static void nft_commit_release(struct nft_trans *trans)
8802 {
8803         switch (trans->msg_type) {
8804         case NFT_MSG_DELTABLE:
8805                 nf_tables_table_destroy(&trans->ctx);
8806                 break;
8807         case NFT_MSG_NEWCHAIN:
8808                 free_percpu(nft_trans_chain_stats(trans));
8809                 kfree(nft_trans_chain_name(trans));
8810                 break;
8811         case NFT_MSG_DELCHAIN:
8812                 nf_tables_chain_destroy(&trans->ctx);
8813                 break;
8814         case NFT_MSG_DELRULE:
8815                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8816                 break;
8817         case NFT_MSG_DELSET:
8818                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8819                 break;
8820         case NFT_MSG_DELSETELEM:
8821                 nf_tables_set_elem_destroy(&trans->ctx,
8822                                            nft_trans_elem_set(trans),
8823                                            nft_trans_elem(trans).priv);
8824                 break;
8825         case NFT_MSG_DELOBJ:
8826                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8827                 break;
8828         case NFT_MSG_DELFLOWTABLE:
8829                 if (nft_trans_flowtable_update(trans))
8830                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8831                 else
8832                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8833                 break;
8834         }
8835
8836         if (trans->put_net)
8837                 put_net(trans->ctx.net);
8838
8839         kfree(trans);
8840 }
8841
8842 static void nf_tables_trans_destroy_work(struct work_struct *w)
8843 {
8844         struct nft_trans *trans, *next;
8845         LIST_HEAD(head);
8846
8847         spin_lock(&nf_tables_destroy_list_lock);
8848         list_splice_init(&nf_tables_destroy_list, &head);
8849         spin_unlock(&nf_tables_destroy_list_lock);
8850
8851         if (list_empty(&head))
8852                 return;
8853
8854         synchronize_rcu();
8855
8856         list_for_each_entry_safe(trans, next, &head, list) {
8857                 nft_trans_list_del(trans);
8858                 nft_commit_release(trans);
8859         }
8860 }
8861
8862 void nf_tables_trans_destroy_flush_work(void)
8863 {
8864         flush_work(&trans_destroy_work);
8865 }
8866 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8867
8868 static bool nft_expr_reduce(struct nft_regs_track *track,
8869                             const struct nft_expr *expr)
8870 {
8871         return false;
8872 }
8873
8874 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8875 {
8876         const struct nft_expr *expr, *last;
8877         struct nft_regs_track track = {};
8878         unsigned int size, data_size;
8879         void *data, *data_boundary;
8880         struct nft_rule_dp *prule;
8881         struct nft_rule *rule;
8882
8883         /* already handled or inactive chain? */
8884         if (chain->blob_next || !nft_is_active_next(net, chain))
8885                 return 0;
8886
8887         data_size = 0;
8888         list_for_each_entry(rule, &chain->rules, list) {
8889                 if (nft_is_active_next(net, rule)) {
8890                         data_size += sizeof(*prule) + rule->dlen;
8891                         if (data_size > INT_MAX)
8892                                 return -ENOMEM;
8893                 }
8894         }
8895         data_size += offsetof(struct nft_rule_dp, data);        /* last rule */
8896
8897         chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8898         if (!chain->blob_next)
8899                 return -ENOMEM;
8900
8901         data = (void *)chain->blob_next->data;
8902         data_boundary = data + data_size;
8903         size = 0;
8904
8905         list_for_each_entry(rule, &chain->rules, list) {
8906                 if (!nft_is_active_next(net, rule))
8907                         continue;
8908
8909                 prule = (struct nft_rule_dp *)data;
8910                 data += offsetof(struct nft_rule_dp, data);
8911                 if (WARN_ON_ONCE(data > data_boundary))
8912                         return -ENOMEM;
8913
8914                 size = 0;
8915                 track.last = nft_expr_last(rule);
8916                 nft_rule_for_each_expr(expr, last, rule) {
8917                         track.cur = expr;
8918
8919                         if (nft_expr_reduce(&track, expr)) {
8920                                 expr = track.cur;
8921                                 continue;
8922                         }
8923
8924                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
8925                                 return -ENOMEM;
8926
8927                         memcpy(data + size, expr, expr->ops->size);
8928                         size += expr->ops->size;
8929                 }
8930                 if (WARN_ON_ONCE(size >= 1 << 12))
8931                         return -ENOMEM;
8932
8933                 prule->handle = rule->handle;
8934                 prule->dlen = size;
8935                 prule->is_last = 0;
8936
8937                 data += size;
8938                 size = 0;
8939                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8940         }
8941
8942         prule = (struct nft_rule_dp *)data;
8943         data += offsetof(struct nft_rule_dp, data);
8944         if (WARN_ON_ONCE(data > data_boundary))
8945                 return -ENOMEM;
8946
8947         nft_last_rule(chain->blob_next, prule);
8948
8949         return 0;
8950 }
8951
8952 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8953 {
8954         struct nftables_pernet *nft_net = nft_pernet(net);
8955         struct nft_trans *trans, *next;
8956
8957         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8958                 struct nft_chain *chain = trans->ctx.chain;
8959
8960                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8961                     trans->msg_type == NFT_MSG_DELRULE) {
8962                         kvfree(chain->blob_next);
8963                         chain->blob_next = NULL;
8964                 }
8965         }
8966 }
8967
8968 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8969 {
8970         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8971
8972         kvfree(o->blob);
8973 }
8974
8975 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8976 {
8977         struct nft_rules_old *old;
8978
8979         /* rcu_head is after end marker */
8980         old = (void *)blob + sizeof(*blob) + blob->size;
8981         old->blob = blob;
8982
8983         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8984 }
8985
8986 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8987 {
8988         struct nft_rule_blob *g0, *g1;
8989         bool next_genbit;
8990
8991         next_genbit = nft_gencursor_next(net);
8992
8993         g0 = rcu_dereference_protected(chain->blob_gen_0,
8994                                        lockdep_commit_lock_is_held(net));
8995         g1 = rcu_dereference_protected(chain->blob_gen_1,
8996                                        lockdep_commit_lock_is_held(net));
8997
8998         /* No changes to this chain? */
8999         if (chain->blob_next == NULL) {
9000                 /* chain had no change in last or next generation */
9001                 if (g0 == g1)
9002                         return;
9003                 /*
9004                  * chain had no change in this generation; make sure next
9005                  * one uses same rules as current generation.
9006                  */
9007                 if (next_genbit) {
9008                         rcu_assign_pointer(chain->blob_gen_1, g0);
9009                         nf_tables_commit_chain_free_rules_old(g1);
9010                 } else {
9011                         rcu_assign_pointer(chain->blob_gen_0, g1);
9012                         nf_tables_commit_chain_free_rules_old(g0);
9013                 }
9014
9015                 return;
9016         }
9017
9018         if (next_genbit)
9019                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9020         else
9021                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9022
9023         chain->blob_next = NULL;
9024
9025         if (g0 == g1)
9026                 return;
9027
9028         if (next_genbit)
9029                 nf_tables_commit_chain_free_rules_old(g1);
9030         else
9031                 nf_tables_commit_chain_free_rules_old(g0);
9032 }
9033
9034 static void nft_obj_del(struct nft_object *obj)
9035 {
9036         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9037         list_del_rcu(&obj->list);
9038 }
9039
9040 void nft_chain_del(struct nft_chain *chain)
9041 {
9042         struct nft_table *table = chain->table;
9043
9044         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9045                                      nft_chain_ht_params));
9046         list_del_rcu(&chain->list);
9047 }
9048
9049 static void nf_tables_module_autoload_cleanup(struct net *net)
9050 {
9051         struct nftables_pernet *nft_net = nft_pernet(net);
9052         struct nft_module_request *req, *next;
9053
9054         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9055         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9056                 WARN_ON_ONCE(!req->done);
9057                 list_del(&req->list);
9058                 kfree(req);
9059         }
9060 }
9061
9062 static void nf_tables_commit_release(struct net *net)
9063 {
9064         struct nftables_pernet *nft_net = nft_pernet(net);
9065         struct nft_trans *trans;
9066
9067         /* all side effects have to be made visible.
9068          * For example, if a chain named 'foo' has been deleted, a
9069          * new transaction must not find it anymore.
9070          *
9071          * Memory reclaim happens asynchronously from work queue
9072          * to prevent expensive synchronize_rcu() in commit phase.
9073          */
9074         if (list_empty(&nft_net->commit_list)) {
9075                 nf_tables_module_autoload_cleanup(net);
9076                 mutex_unlock(&nft_net->commit_mutex);
9077                 return;
9078         }
9079
9080         trans = list_last_entry(&nft_net->commit_list,
9081                                 struct nft_trans, list);
9082         get_net(trans->ctx.net);
9083         WARN_ON_ONCE(trans->put_net);
9084
9085         trans->put_net = true;
9086         spin_lock(&nf_tables_destroy_list_lock);
9087         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9088         spin_unlock(&nf_tables_destroy_list_lock);
9089
9090         nf_tables_module_autoload_cleanup(net);
9091         schedule_work(&trans_destroy_work);
9092
9093         mutex_unlock(&nft_net->commit_mutex);
9094 }
9095
9096 static void nft_commit_notify(struct net *net, u32 portid)
9097 {
9098         struct nftables_pernet *nft_net = nft_pernet(net);
9099         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9100         unsigned char *data;
9101         int len;
9102
9103         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9104                 if (!batch_skb) {
9105 new_batch:
9106                         batch_skb = skb;
9107                         len = NLMSG_GOODSIZE - skb->len;
9108                         list_del(&skb->list);
9109                         continue;
9110                 }
9111                 len -= skb->len;
9112                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9113                         data = skb_put(batch_skb, skb->len);
9114                         memcpy(data, skb->data, skb->len);
9115                         list_del(&skb->list);
9116                         kfree_skb(skb);
9117                         continue;
9118                 }
9119                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9120                                NFT_CB(batch_skb).report, GFP_KERNEL);
9121                 goto new_batch;
9122         }
9123
9124         if (batch_skb) {
9125                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9126                                NFT_CB(batch_skb).report, GFP_KERNEL);
9127         }
9128
9129         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9130 }
9131
9132 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9133                                         struct nft_table *table)
9134 {
9135         struct nft_audit_data *adp;
9136
9137         list_for_each_entry(adp, adl, list) {
9138                 if (adp->table == table)
9139                         return 0;
9140         }
9141         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9142         if (!adp)
9143                 return -ENOMEM;
9144         adp->table = table;
9145         list_add(&adp->list, adl);
9146         return 0;
9147 }
9148
9149 static void nf_tables_commit_audit_free(struct list_head *adl)
9150 {
9151         struct nft_audit_data *adp, *adn;
9152
9153         list_for_each_entry_safe(adp, adn, adl, list) {
9154                 list_del(&adp->list);
9155                 kfree(adp);
9156         }
9157 }
9158
9159 static void nf_tables_commit_audit_collect(struct list_head *adl,
9160                                            struct nft_table *table, u32 op)
9161 {
9162         struct nft_audit_data *adp;
9163
9164         list_for_each_entry(adp, adl, list) {
9165                 if (adp->table == table)
9166                         goto found;
9167         }
9168         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9169         return;
9170 found:
9171         adp->entries++;
9172         if (!adp->op || adp->op > op)
9173                 adp->op = op;
9174 }
9175
9176 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9177
9178 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9179 {
9180         struct nft_audit_data *adp, *adn;
9181         char aubuf[AUNFTABLENAMELEN];
9182
9183         list_for_each_entry_safe(adp, adn, adl, list) {
9184                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9185                          generation);
9186                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9187                                 nft2audit_op[adp->op], GFP_KERNEL);
9188                 list_del(&adp->list);
9189                 kfree(adp);
9190         }
9191 }
9192
9193 static void nft_set_commit_update(struct list_head *set_update_list)
9194 {
9195         struct nft_set *set, *next;
9196
9197         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9198                 list_del_init(&set->pending_update);
9199
9200                 if (!set->ops->commit)
9201                         continue;
9202
9203                 set->ops->commit(set);
9204         }
9205 }
9206
9207 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9208 {
9209         struct nftables_pernet *nft_net = nft_pernet(net);
9210         struct nft_trans *trans, *next;
9211         LIST_HEAD(set_update_list);
9212         struct nft_trans_elem *te;
9213         struct nft_chain *chain;
9214         struct nft_table *table;
9215         unsigned int base_seq;
9216         LIST_HEAD(adl);
9217         int err;
9218
9219         if (list_empty(&nft_net->commit_list)) {
9220                 mutex_unlock(&nft_net->commit_mutex);
9221                 return 0;
9222         }
9223
9224         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9225                 switch (trans->msg_type) {
9226                 case NFT_MSG_NEWSET:
9227                         if (!nft_trans_set_update(trans) &&
9228                             nft_set_is_anonymous(nft_trans_set(trans)) &&
9229                             !nft_trans_set_bound(trans)) {
9230                                 pr_warn_once("nftables ruleset with unbound set\n");
9231                                 return -EINVAL;
9232                         }
9233                         break;
9234                 case NFT_MSG_NEWCHAIN:
9235                         if (!nft_trans_chain_update(trans) &&
9236                             nft_chain_binding(nft_trans_chain(trans)) &&
9237                             !nft_trans_chain_bound(trans)) {
9238                                 pr_warn_once("nftables ruleset with unbound chain\n");
9239                                 return -EINVAL;
9240                         }
9241                         break;
9242                 }
9243         }
9244
9245         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9246         if (nf_tables_validate(net) < 0)
9247                 return -EAGAIN;
9248
9249         err = nft_flow_rule_offload_commit(net);
9250         if (err < 0)
9251                 return err;
9252
9253         /* 1.  Allocate space for next generation rules_gen_X[] */
9254         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9255                 int ret;
9256
9257                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9258                 if (ret) {
9259                         nf_tables_commit_chain_prepare_cancel(net);
9260                         nf_tables_commit_audit_free(&adl);
9261                         return ret;
9262                 }
9263                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9264                     trans->msg_type == NFT_MSG_DELRULE) {
9265                         chain = trans->ctx.chain;
9266
9267                         ret = nf_tables_commit_chain_prepare(net, chain);
9268                         if (ret < 0) {
9269                                 nf_tables_commit_chain_prepare_cancel(net);
9270                                 nf_tables_commit_audit_free(&adl);
9271                                 return ret;
9272                         }
9273                 }
9274         }
9275
9276         /* step 2.  Make rules_gen_X visible to packet path */
9277         list_for_each_entry(table, &nft_net->tables, list) {
9278                 list_for_each_entry(chain, &table->chains, list)
9279                         nf_tables_commit_chain(net, chain);
9280         }
9281
9282         /*
9283          * Bump generation counter, invalidate any dump in progress.
9284          * Cannot fail after this point.
9285          */
9286         base_seq = READ_ONCE(nft_net->base_seq);
9287         while (++base_seq == 0)
9288                 ;
9289
9290         WRITE_ONCE(nft_net->base_seq, base_seq);
9291
9292         /* step 3. Start new generation, rules_gen_X now in use. */
9293         net->nft.gencursor = nft_gencursor_next(net);
9294
9295         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9296                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9297                                                trans->msg_type);
9298                 switch (trans->msg_type) {
9299                 case NFT_MSG_NEWTABLE:
9300                         if (nft_trans_table_update(trans)) {
9301                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9302                                         nft_trans_destroy(trans);
9303                                         break;
9304                                 }
9305                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9306                                         nf_tables_table_disable(net, trans->ctx.table);
9307
9308                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9309                         } else {
9310                                 nft_clear(net, trans->ctx.table);
9311                         }
9312                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9313                         nft_trans_destroy(trans);
9314                         break;
9315                 case NFT_MSG_DELTABLE:
9316                         list_del_rcu(&trans->ctx.table->list);
9317                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
9318                         break;
9319                 case NFT_MSG_NEWCHAIN:
9320                         if (nft_trans_chain_update(trans)) {
9321                                 nft_chain_commit_update(trans);
9322                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9323                                 /* trans destroyed after rcu grace period */
9324                         } else {
9325                                 nft_chain_commit_drop_policy(trans);
9326                                 nft_clear(net, trans->ctx.chain);
9327                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9328                                 nft_trans_destroy(trans);
9329                         }
9330                         break;
9331                 case NFT_MSG_DELCHAIN:
9332                         nft_chain_del(trans->ctx.chain);
9333                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
9334                         nf_tables_unregister_hook(trans->ctx.net,
9335                                                   trans->ctx.table,
9336                                                   trans->ctx.chain);
9337                         break;
9338                 case NFT_MSG_NEWRULE:
9339                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9340                         nf_tables_rule_notify(&trans->ctx,
9341                                               nft_trans_rule(trans),
9342                                               NFT_MSG_NEWRULE);
9343                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9344                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9345
9346                         nft_trans_destroy(trans);
9347                         break;
9348                 case NFT_MSG_DELRULE:
9349                         list_del_rcu(&nft_trans_rule(trans)->list);
9350                         nf_tables_rule_notify(&trans->ctx,
9351                                               nft_trans_rule(trans),
9352                                               NFT_MSG_DELRULE);
9353                         nft_rule_expr_deactivate(&trans->ctx,
9354                                                  nft_trans_rule(trans),
9355                                                  NFT_TRANS_COMMIT);
9356
9357                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9358                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9359                         break;
9360                 case NFT_MSG_NEWSET:
9361                         if (nft_trans_set_update(trans)) {
9362                                 struct nft_set *set = nft_trans_set(trans);
9363
9364                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9365                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9366                         } else {
9367                                 nft_clear(net, nft_trans_set(trans));
9368                                 /* This avoids hitting -EBUSY when deleting the table
9369                                  * from the transaction.
9370                                  */
9371                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9372                                     !list_empty(&nft_trans_set(trans)->bindings))
9373                                         trans->ctx.table->use--;
9374                         }
9375                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9376                                              NFT_MSG_NEWSET, GFP_KERNEL);
9377                         nft_trans_destroy(trans);
9378                         break;
9379                 case NFT_MSG_DELSET:
9380                         list_del_rcu(&nft_trans_set(trans)->list);
9381                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9382                                              NFT_MSG_DELSET, GFP_KERNEL);
9383                         break;
9384                 case NFT_MSG_NEWSETELEM:
9385                         te = (struct nft_trans_elem *)trans->data;
9386
9387                         nft_setelem_activate(net, te->set, &te->elem);
9388                         nf_tables_setelem_notify(&trans->ctx, te->set,
9389                                                  &te->elem,
9390                                                  NFT_MSG_NEWSETELEM);
9391                         if (te->set->ops->commit &&
9392                             list_empty(&te->set->pending_update)) {
9393                                 list_add_tail(&te->set->pending_update,
9394                                               &set_update_list);
9395                         }
9396                         nft_trans_destroy(trans);
9397                         break;
9398                 case NFT_MSG_DELSETELEM:
9399                         te = (struct nft_trans_elem *)trans->data;
9400
9401                         nf_tables_setelem_notify(&trans->ctx, te->set,
9402                                                  &te->elem,
9403                                                  NFT_MSG_DELSETELEM);
9404                         nft_setelem_remove(net, te->set, &te->elem);
9405                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9406                                 atomic_dec(&te->set->nelems);
9407                                 te->set->ndeact--;
9408                         }
9409                         if (te->set->ops->commit &&
9410                             list_empty(&te->set->pending_update)) {
9411                                 list_add_tail(&te->set->pending_update,
9412                                               &set_update_list);
9413                         }
9414                         break;
9415                 case NFT_MSG_NEWOBJ:
9416                         if (nft_trans_obj_update(trans)) {
9417                                 nft_obj_commit_update(trans);
9418                                 nf_tables_obj_notify(&trans->ctx,
9419                                                      nft_trans_obj(trans),
9420                                                      NFT_MSG_NEWOBJ);
9421                         } else {
9422                                 nft_clear(net, nft_trans_obj(trans));
9423                                 nf_tables_obj_notify(&trans->ctx,
9424                                                      nft_trans_obj(trans),
9425                                                      NFT_MSG_NEWOBJ);
9426                                 nft_trans_destroy(trans);
9427                         }
9428                         break;
9429                 case NFT_MSG_DELOBJ:
9430                         nft_obj_del(nft_trans_obj(trans));
9431                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9432                                              NFT_MSG_DELOBJ);
9433                         break;
9434                 case NFT_MSG_NEWFLOWTABLE:
9435                         if (nft_trans_flowtable_update(trans)) {
9436                                 nft_trans_flowtable(trans)->data.flags =
9437                                         nft_trans_flowtable_flags(trans);
9438                                 nf_tables_flowtable_notify(&trans->ctx,
9439                                                            nft_trans_flowtable(trans),
9440                                                            &nft_trans_flowtable_hooks(trans),
9441                                                            NFT_MSG_NEWFLOWTABLE);
9442                                 list_splice(&nft_trans_flowtable_hooks(trans),
9443                                             &nft_trans_flowtable(trans)->hook_list);
9444                         } else {
9445                                 nft_clear(net, nft_trans_flowtable(trans));
9446                                 nf_tables_flowtable_notify(&trans->ctx,
9447                                                            nft_trans_flowtable(trans),
9448                                                            &nft_trans_flowtable(trans)->hook_list,
9449                                                            NFT_MSG_NEWFLOWTABLE);
9450                         }
9451                         nft_trans_destroy(trans);
9452                         break;
9453                 case NFT_MSG_DELFLOWTABLE:
9454                         if (nft_trans_flowtable_update(trans)) {
9455                                 nf_tables_flowtable_notify(&trans->ctx,
9456                                                            nft_trans_flowtable(trans),
9457                                                            &nft_trans_flowtable_hooks(trans),
9458                                                            NFT_MSG_DELFLOWTABLE);
9459                                 nft_unregister_flowtable_net_hooks(net,
9460                                                                    &nft_trans_flowtable_hooks(trans));
9461                         } else {
9462                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9463                                 nf_tables_flowtable_notify(&trans->ctx,
9464                                                            nft_trans_flowtable(trans),
9465                                                            &nft_trans_flowtable(trans)->hook_list,
9466                                                            NFT_MSG_DELFLOWTABLE);
9467                                 nft_unregister_flowtable_net_hooks(net,
9468                                                 &nft_trans_flowtable(trans)->hook_list);
9469                         }
9470                         break;
9471                 }
9472         }
9473
9474         nft_set_commit_update(&set_update_list);
9475
9476         nft_commit_notify(net, NETLINK_CB(skb).portid);
9477         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9478         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9479         nf_tables_commit_release(net);
9480
9481         return 0;
9482 }
9483
9484 static void nf_tables_module_autoload(struct net *net)
9485 {
9486         struct nftables_pernet *nft_net = nft_pernet(net);
9487         struct nft_module_request *req, *next;
9488         LIST_HEAD(module_list);
9489
9490         list_splice_init(&nft_net->module_list, &module_list);
9491         mutex_unlock(&nft_net->commit_mutex);
9492         list_for_each_entry_safe(req, next, &module_list, list) {
9493                 request_module("%s", req->module);
9494                 req->done = true;
9495         }
9496         mutex_lock(&nft_net->commit_mutex);
9497         list_splice(&module_list, &nft_net->module_list);
9498 }
9499
9500 static void nf_tables_abort_release(struct nft_trans *trans)
9501 {
9502         switch (trans->msg_type) {
9503         case NFT_MSG_NEWTABLE:
9504                 nf_tables_table_destroy(&trans->ctx);
9505                 break;
9506         case NFT_MSG_NEWCHAIN:
9507                 nf_tables_chain_destroy(&trans->ctx);
9508                 break;
9509         case NFT_MSG_NEWRULE:
9510                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9511                 break;
9512         case NFT_MSG_NEWSET:
9513                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9514                 break;
9515         case NFT_MSG_NEWSETELEM:
9516                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9517                                      nft_trans_elem(trans).priv, true);
9518                 break;
9519         case NFT_MSG_NEWOBJ:
9520                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9521                 break;
9522         case NFT_MSG_NEWFLOWTABLE:
9523                 if (nft_trans_flowtable_update(trans))
9524                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9525                 else
9526                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9527                 break;
9528         }
9529         kfree(trans);
9530 }
9531
9532 static void nft_set_abort_update(struct list_head *set_update_list)
9533 {
9534         struct nft_set *set, *next;
9535
9536         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9537                 list_del_init(&set->pending_update);
9538
9539                 if (!set->ops->abort)
9540                         continue;
9541
9542                 set->ops->abort(set);
9543         }
9544 }
9545
9546 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9547 {
9548         struct nftables_pernet *nft_net = nft_pernet(net);
9549         struct nft_trans *trans, *next;
9550         LIST_HEAD(set_update_list);
9551         struct nft_trans_elem *te;
9552
9553         if (action == NFNL_ABORT_VALIDATE &&
9554             nf_tables_validate(net) < 0)
9555                 return -EAGAIN;
9556
9557         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9558                                          list) {
9559                 switch (trans->msg_type) {
9560                 case NFT_MSG_NEWTABLE:
9561                         if (nft_trans_table_update(trans)) {
9562                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9563                                         nft_trans_destroy(trans);
9564                                         break;
9565                                 }
9566                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9567                                         nf_tables_table_disable(net, trans->ctx.table);
9568                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9569                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9570                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9571                                 }
9572                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9573                                 nft_trans_destroy(trans);
9574                         } else {
9575                                 list_del_rcu(&trans->ctx.table->list);
9576                         }
9577                         break;
9578                 case NFT_MSG_DELTABLE:
9579                         nft_clear(trans->ctx.net, trans->ctx.table);
9580                         nft_trans_destroy(trans);
9581                         break;
9582                 case NFT_MSG_NEWCHAIN:
9583                         if (nft_trans_chain_update(trans)) {
9584                                 free_percpu(nft_trans_chain_stats(trans));
9585                                 kfree(nft_trans_chain_name(trans));
9586                                 nft_trans_destroy(trans);
9587                         } else {
9588                                 if (nft_trans_chain_bound(trans)) {
9589                                         nft_trans_destroy(trans);
9590                                         break;
9591                                 }
9592                                 trans->ctx.table->use--;
9593                                 nft_chain_del(trans->ctx.chain);
9594                                 nf_tables_unregister_hook(trans->ctx.net,
9595                                                           trans->ctx.table,
9596                                                           trans->ctx.chain);
9597                         }
9598                         break;
9599                 case NFT_MSG_DELCHAIN:
9600                         trans->ctx.table->use++;
9601                         nft_clear(trans->ctx.net, trans->ctx.chain);
9602                         nft_trans_destroy(trans);
9603                         break;
9604                 case NFT_MSG_NEWRULE:
9605                         if (nft_trans_rule_bound(trans)) {
9606                                 nft_trans_destroy(trans);
9607                                 break;
9608                         }
9609                         trans->ctx.chain->use--;
9610                         list_del_rcu(&nft_trans_rule(trans)->list);
9611                         nft_rule_expr_deactivate(&trans->ctx,
9612                                                  nft_trans_rule(trans),
9613                                                  NFT_TRANS_ABORT);
9614                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9615                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9616                         break;
9617                 case NFT_MSG_DELRULE:
9618                         trans->ctx.chain->use++;
9619                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9620                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9621                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9622                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9623
9624                         nft_trans_destroy(trans);
9625                         break;
9626                 case NFT_MSG_NEWSET:
9627                         if (nft_trans_set_update(trans)) {
9628                                 nft_trans_destroy(trans);
9629                                 break;
9630                         }
9631                         trans->ctx.table->use--;
9632                         if (nft_trans_set_bound(trans)) {
9633                                 nft_trans_destroy(trans);
9634                                 break;
9635                         }
9636                         list_del_rcu(&nft_trans_set(trans)->list);
9637                         break;
9638                 case NFT_MSG_DELSET:
9639                         trans->ctx.table->use++;
9640                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9641                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
9642                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
9643
9644                         nft_trans_destroy(trans);
9645                         break;
9646                 case NFT_MSG_NEWSETELEM:
9647                         if (nft_trans_elem_set_bound(trans)) {
9648                                 nft_trans_destroy(trans);
9649                                 break;
9650                         }
9651                         te = (struct nft_trans_elem *)trans->data;
9652                         nft_setelem_remove(net, te->set, &te->elem);
9653                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9654                                 atomic_dec(&te->set->nelems);
9655
9656                         if (te->set->ops->abort &&
9657                             list_empty(&te->set->pending_update)) {
9658                                 list_add_tail(&te->set->pending_update,
9659                                               &set_update_list);
9660                         }
9661                         break;
9662                 case NFT_MSG_DELSETELEM:
9663                         te = (struct nft_trans_elem *)trans->data;
9664
9665                         nft_setelem_data_activate(net, te->set, &te->elem);
9666                         nft_setelem_activate(net, te->set, &te->elem);
9667                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9668                                 te->set->ndeact--;
9669
9670                         if (te->set->ops->abort &&
9671                             list_empty(&te->set->pending_update)) {
9672                                 list_add_tail(&te->set->pending_update,
9673                                               &set_update_list);
9674                         }
9675                         nft_trans_destroy(trans);
9676                         break;
9677                 case NFT_MSG_NEWOBJ:
9678                         if (nft_trans_obj_update(trans)) {
9679                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9680                                 nft_trans_destroy(trans);
9681                         } else {
9682                                 trans->ctx.table->use--;
9683                                 nft_obj_del(nft_trans_obj(trans));
9684                         }
9685                         break;
9686                 case NFT_MSG_DELOBJ:
9687                         trans->ctx.table->use++;
9688                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9689                         nft_trans_destroy(trans);
9690                         break;
9691                 case NFT_MSG_NEWFLOWTABLE:
9692                         if (nft_trans_flowtable_update(trans)) {
9693                                 nft_unregister_flowtable_net_hooks(net,
9694                                                 &nft_trans_flowtable_hooks(trans));
9695                         } else {
9696                                 trans->ctx.table->use--;
9697                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9698                                 nft_unregister_flowtable_net_hooks(net,
9699                                                 &nft_trans_flowtable(trans)->hook_list);
9700                         }
9701                         break;
9702                 case NFT_MSG_DELFLOWTABLE:
9703                         if (nft_trans_flowtable_update(trans)) {
9704                                 list_splice(&nft_trans_flowtable_hooks(trans),
9705                                             &nft_trans_flowtable(trans)->hook_list);
9706                         } else {
9707                                 trans->ctx.table->use++;
9708                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9709                         }
9710                         nft_trans_destroy(trans);
9711                         break;
9712                 }
9713         }
9714
9715         nft_set_abort_update(&set_update_list);
9716
9717         synchronize_rcu();
9718
9719         list_for_each_entry_safe_reverse(trans, next,
9720                                          &nft_net->commit_list, list) {
9721                 nft_trans_list_del(trans);
9722                 nf_tables_abort_release(trans);
9723         }
9724
9725         if (action == NFNL_ABORT_AUTOLOAD)
9726                 nf_tables_module_autoload(net);
9727         else
9728                 nf_tables_module_autoload_cleanup(net);
9729
9730         return 0;
9731 }
9732
9733 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9734                            enum nfnl_abort_action action)
9735 {
9736         struct nftables_pernet *nft_net = nft_pernet(net);
9737         int ret = __nf_tables_abort(net, action);
9738
9739         mutex_unlock(&nft_net->commit_mutex);
9740
9741         return ret;
9742 }
9743
9744 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9745 {
9746         struct nftables_pernet *nft_net = nft_pernet(net);
9747         bool genid_ok;
9748
9749         mutex_lock(&nft_net->commit_mutex);
9750
9751         genid_ok = genid == 0 || nft_net->base_seq == genid;
9752         if (!genid_ok)
9753                 mutex_unlock(&nft_net->commit_mutex);
9754
9755         /* else, commit mutex has to be released by commit or abort function */
9756         return genid_ok;
9757 }
9758
9759 static const struct nfnetlink_subsystem nf_tables_subsys = {
9760         .name           = "nf_tables",
9761         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9762         .cb_count       = NFT_MSG_MAX,
9763         .cb             = nf_tables_cb,
9764         .commit         = nf_tables_commit,
9765         .abort          = nf_tables_abort,
9766         .valid_genid    = nf_tables_valid_genid,
9767         .owner          = THIS_MODULE,
9768 };
9769
9770 int nft_chain_validate_dependency(const struct nft_chain *chain,
9771                                   enum nft_chain_types type)
9772 {
9773         const struct nft_base_chain *basechain;
9774
9775         if (nft_is_base_chain(chain)) {
9776                 basechain = nft_base_chain(chain);
9777                 if (basechain->type->type != type)
9778                         return -EOPNOTSUPP;
9779         }
9780         return 0;
9781 }
9782 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9783
9784 int nft_chain_validate_hooks(const struct nft_chain *chain,
9785                              unsigned int hook_flags)
9786 {
9787         struct nft_base_chain *basechain;
9788
9789         if (nft_is_base_chain(chain)) {
9790                 basechain = nft_base_chain(chain);
9791
9792                 if ((1 << basechain->ops.hooknum) & hook_flags)
9793                         return 0;
9794
9795                 return -EOPNOTSUPP;
9796         }
9797
9798         return 0;
9799 }
9800 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9801
9802 /*
9803  * Loop detection - walk through the ruleset beginning at the destination chain
9804  * of a new jump until either the source chain is reached (loop) or all
9805  * reachable chains have been traversed.
9806  *
9807  * The loop check is performed whenever a new jump verdict is added to an
9808  * expression or verdict map or a verdict map is bound to a new chain.
9809  */
9810
9811 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9812                                  const struct nft_chain *chain);
9813
9814 static int nft_check_loops(const struct nft_ctx *ctx,
9815                            const struct nft_set_ext *ext)
9816 {
9817         const struct nft_data *data;
9818         int ret;
9819
9820         data = nft_set_ext_data(ext);
9821         switch (data->verdict.code) {
9822         case NFT_JUMP:
9823         case NFT_GOTO:
9824                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9825                 break;
9826         default:
9827                 ret = 0;
9828                 break;
9829         }
9830
9831         return ret;
9832 }
9833
9834 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9835                                         struct nft_set *set,
9836                                         const struct nft_set_iter *iter,
9837                                         struct nft_set_elem *elem)
9838 {
9839         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9840
9841         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9842             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9843                 return 0;
9844
9845         return nft_check_loops(ctx, ext);
9846 }
9847
9848 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9849                                   struct nft_set *set)
9850 {
9851         u8 genmask = nft_genmask_next(ctx->net);
9852         struct nft_set_elem_catchall *catchall;
9853         struct nft_set_ext *ext;
9854         int ret = 0;
9855
9856         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9857                 ext = nft_set_elem_ext(set, catchall->elem);
9858                 if (!nft_set_elem_active(ext, genmask))
9859                         continue;
9860
9861                 ret = nft_check_loops(ctx, ext);
9862                 if (ret < 0)
9863                         return ret;
9864         }
9865
9866         return ret;
9867 }
9868
9869 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9870                                  const struct nft_chain *chain)
9871 {
9872         const struct nft_rule *rule;
9873         const struct nft_expr *expr, *last;
9874         struct nft_set *set;
9875         struct nft_set_binding *binding;
9876         struct nft_set_iter iter;
9877
9878         if (ctx->chain == chain)
9879                 return -ELOOP;
9880
9881         list_for_each_entry(rule, &chain->rules, list) {
9882                 nft_rule_for_each_expr(expr, last, rule) {
9883                         struct nft_immediate_expr *priv;
9884                         const struct nft_data *data;
9885                         int err;
9886
9887                         if (strcmp(expr->ops->type->name, "immediate"))
9888                                 continue;
9889
9890                         priv = nft_expr_priv(expr);
9891                         if (priv->dreg != NFT_REG_VERDICT)
9892                                 continue;
9893
9894                         data = &priv->data;
9895                         switch (data->verdict.code) {
9896                         case NFT_JUMP:
9897                         case NFT_GOTO:
9898                                 err = nf_tables_check_loops(ctx,
9899                                                         data->verdict.chain);
9900                                 if (err < 0)
9901                                         return err;
9902                                 break;
9903                         default:
9904                                 break;
9905                         }
9906                 }
9907         }
9908
9909         list_for_each_entry(set, &ctx->table->sets, list) {
9910                 if (!nft_is_active_next(ctx->net, set))
9911                         continue;
9912                 if (!(set->flags & NFT_SET_MAP) ||
9913                     set->dtype != NFT_DATA_VERDICT)
9914                         continue;
9915
9916                 list_for_each_entry(binding, &set->bindings, list) {
9917                         if (!(binding->flags & NFT_SET_MAP) ||
9918                             binding->chain != chain)
9919                                 continue;
9920
9921                         iter.genmask    = nft_genmask_next(ctx->net);
9922                         iter.skip       = 0;
9923                         iter.count      = 0;
9924                         iter.err        = 0;
9925                         iter.fn         = nf_tables_loop_check_setelem;
9926
9927                         set->ops->walk(ctx, set, &iter);
9928                         if (!iter.err)
9929                                 iter.err = nft_set_catchall_loops(ctx, set);
9930
9931                         if (iter.err < 0)
9932                                 return iter.err;
9933                 }
9934         }
9935
9936         return 0;
9937 }
9938
9939 /**
9940  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9941  *
9942  *      @attr: netlink attribute to fetch value from
9943  *      @max: maximum value to be stored in dest
9944  *      @dest: pointer to the variable
9945  *
9946  *      Parse, check and store a given u32 netlink attribute into variable.
9947  *      This function returns -ERANGE if the value goes over maximum value.
9948  *      Otherwise a 0 is returned and the attribute value is stored in the
9949  *      destination variable.
9950  */
9951 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9952 {
9953         u32 val;
9954
9955         val = ntohl(nla_get_be32(attr));
9956         if (val > max)
9957                 return -ERANGE;
9958
9959         *dest = val;
9960         return 0;
9961 }
9962 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9963
9964 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9965 {
9966         unsigned int reg;
9967
9968         reg = ntohl(nla_get_be32(attr));
9969         switch (reg) {
9970         case NFT_REG_VERDICT...NFT_REG_4:
9971                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9972                 break;
9973         case NFT_REG32_00...NFT_REG32_15:
9974                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9975                 break;
9976         default:
9977                 return -ERANGE;
9978         }
9979
9980         return 0;
9981 }
9982
9983 /**
9984  *      nft_dump_register - dump a register value to a netlink attribute
9985  *
9986  *      @skb: socket buffer
9987  *      @attr: attribute number
9988  *      @reg: register number
9989  *
9990  *      Construct a netlink attribute containing the register number. For
9991  *      compatibility reasons, register numbers being a multiple of 4 are
9992  *      translated to the corresponding 128 bit register numbers.
9993  */
9994 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9995 {
9996         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9997                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9998         else
9999                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10000
10001         return nla_put_be32(skb, attr, htonl(reg));
10002 }
10003 EXPORT_SYMBOL_GPL(nft_dump_register);
10004
10005 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10006 {
10007         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10008                 return -EINVAL;
10009         if (len == 0)
10010                 return -EINVAL;
10011         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10012                 return -ERANGE;
10013
10014         return 0;
10015 }
10016
10017 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10018 {
10019         u32 reg;
10020         int err;
10021
10022         err = nft_parse_register(attr, &reg);
10023         if (err < 0)
10024                 return err;
10025
10026         err = nft_validate_register_load(reg, len);
10027         if (err < 0)
10028                 return err;
10029
10030         *sreg = reg;
10031         return 0;
10032 }
10033 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10034
10035 static int nft_validate_register_store(const struct nft_ctx *ctx,
10036                                        enum nft_registers reg,
10037                                        const struct nft_data *data,
10038                                        enum nft_data_types type,
10039                                        unsigned int len)
10040 {
10041         int err;
10042
10043         switch (reg) {
10044         case NFT_REG_VERDICT:
10045                 if (type != NFT_DATA_VERDICT)
10046                         return -EINVAL;
10047
10048                 if (data != NULL &&
10049                     (data->verdict.code == NFT_GOTO ||
10050                      data->verdict.code == NFT_JUMP)) {
10051                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10052                         if (err < 0)
10053                                 return err;
10054                 }
10055
10056                 return 0;
10057         default:
10058                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10059                         return -EINVAL;
10060                 if (len == 0)
10061                         return -EINVAL;
10062                 if (reg * NFT_REG32_SIZE + len >
10063                     sizeof_field(struct nft_regs, data))
10064                         return -ERANGE;
10065
10066                 if (data != NULL && type != NFT_DATA_VALUE)
10067                         return -EINVAL;
10068                 return 0;
10069         }
10070 }
10071
10072 int nft_parse_register_store(const struct nft_ctx *ctx,
10073                              const struct nlattr *attr, u8 *dreg,
10074                              const struct nft_data *data,
10075                              enum nft_data_types type, unsigned int len)
10076 {
10077         int err;
10078         u32 reg;
10079
10080         err = nft_parse_register(attr, &reg);
10081         if (err < 0)
10082                 return err;
10083
10084         err = nft_validate_register_store(ctx, reg, data, type, len);
10085         if (err < 0)
10086                 return err;
10087
10088         *dreg = reg;
10089         return 0;
10090 }
10091 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10092
10093 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10094         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10095         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10096                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10097         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10098 };
10099
10100 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10101                             struct nft_data_desc *desc, const struct nlattr *nla)
10102 {
10103         u8 genmask = nft_genmask_next(ctx->net);
10104         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10105         struct nft_chain *chain;
10106         int err;
10107
10108         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10109                                           nft_verdict_policy, NULL);
10110         if (err < 0)
10111                 return err;
10112
10113         if (!tb[NFTA_VERDICT_CODE])
10114                 return -EINVAL;
10115         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10116
10117         switch (data->verdict.code) {
10118         default:
10119                 switch (data->verdict.code & NF_VERDICT_MASK) {
10120                 case NF_ACCEPT:
10121                 case NF_DROP:
10122                 case NF_QUEUE:
10123                         break;
10124                 default:
10125                         return -EINVAL;
10126                 }
10127                 fallthrough;
10128         case NFT_CONTINUE:
10129         case NFT_BREAK:
10130         case NFT_RETURN:
10131                 break;
10132         case NFT_JUMP:
10133         case NFT_GOTO:
10134                 if (tb[NFTA_VERDICT_CHAIN]) {
10135                         chain = nft_chain_lookup(ctx->net, ctx->table,
10136                                                  tb[NFTA_VERDICT_CHAIN],
10137                                                  genmask);
10138                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10139                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10140                                                       tb[NFTA_VERDICT_CHAIN_ID]);
10141                         if (IS_ERR(chain))
10142                                 return PTR_ERR(chain);
10143                 } else {
10144                         return -EINVAL;
10145                 }
10146
10147                 if (IS_ERR(chain))
10148                         return PTR_ERR(chain);
10149                 if (nft_is_base_chain(chain))
10150                         return -EOPNOTSUPP;
10151                 if (nft_chain_is_bound(chain))
10152                         return -EINVAL;
10153                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10154                     chain->flags & NFT_CHAIN_BINDING)
10155                         return -EINVAL;
10156
10157                 chain->use++;
10158                 data->verdict.chain = chain;
10159                 break;
10160         }
10161
10162         desc->len = sizeof(data->verdict);
10163
10164         return 0;
10165 }
10166
10167 static void nft_verdict_uninit(const struct nft_data *data)
10168 {
10169         struct nft_chain *chain;
10170
10171         switch (data->verdict.code) {
10172         case NFT_JUMP:
10173         case NFT_GOTO:
10174                 chain = data->verdict.chain;
10175                 chain->use--;
10176                 break;
10177         }
10178 }
10179
10180 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10181 {
10182         struct nlattr *nest;
10183
10184         nest = nla_nest_start_noflag(skb, type);
10185         if (!nest)
10186                 goto nla_put_failure;
10187
10188         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10189                 goto nla_put_failure;
10190
10191         switch (v->code) {
10192         case NFT_JUMP:
10193         case NFT_GOTO:
10194                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10195                                    v->chain->name))
10196                         goto nla_put_failure;
10197         }
10198         nla_nest_end(skb, nest);
10199         return 0;
10200
10201 nla_put_failure:
10202         return -1;
10203 }
10204
10205 static int nft_value_init(const struct nft_ctx *ctx,
10206                           struct nft_data *data, struct nft_data_desc *desc,
10207                           const struct nlattr *nla)
10208 {
10209         unsigned int len;
10210
10211         len = nla_len(nla);
10212         if (len == 0)
10213                 return -EINVAL;
10214         if (len > desc->size)
10215                 return -EOVERFLOW;
10216         if (desc->len) {
10217                 if (len != desc->len)
10218                         return -EINVAL;
10219         } else {
10220                 desc->len = len;
10221         }
10222
10223         nla_memcpy(data->data, nla, len);
10224
10225         return 0;
10226 }
10227
10228 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10229                           unsigned int len)
10230 {
10231         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10232 }
10233
10234 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10235         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10236         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10237 };
10238
10239 /**
10240  *      nft_data_init - parse nf_tables data netlink attributes
10241  *
10242  *      @ctx: context of the expression using the data
10243  *      @data: destination struct nft_data
10244  *      @desc: data description
10245  *      @nla: netlink attribute containing data
10246  *
10247  *      Parse the netlink data attributes and initialize a struct nft_data.
10248  *      The type and length of data are returned in the data description.
10249  *
10250  *      The caller can indicate that it only wants to accept data of type
10251  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10252  */
10253 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10254                   struct nft_data_desc *desc, const struct nlattr *nla)
10255 {
10256         struct nlattr *tb[NFTA_DATA_MAX + 1];
10257         int err;
10258
10259         if (WARN_ON_ONCE(!desc->size))
10260                 return -EINVAL;
10261
10262         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10263                                           nft_data_policy, NULL);
10264         if (err < 0)
10265                 return err;
10266
10267         if (tb[NFTA_DATA_VALUE]) {
10268                 if (desc->type != NFT_DATA_VALUE)
10269                         return -EINVAL;
10270
10271                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10272         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10273                 if (desc->type != NFT_DATA_VERDICT)
10274                         return -EINVAL;
10275
10276                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10277         } else {
10278                 err = -EINVAL;
10279         }
10280
10281         return err;
10282 }
10283 EXPORT_SYMBOL_GPL(nft_data_init);
10284
10285 /**
10286  *      nft_data_release - release a nft_data item
10287  *
10288  *      @data: struct nft_data to release
10289  *      @type: type of data
10290  *
10291  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10292  *      all others need to be released by calling this function.
10293  */
10294 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10295 {
10296         if (type < NFT_DATA_VERDICT)
10297                 return;
10298         switch (type) {
10299         case NFT_DATA_VERDICT:
10300                 return nft_verdict_uninit(data);
10301         default:
10302                 WARN_ON(1);
10303         }
10304 }
10305 EXPORT_SYMBOL_GPL(nft_data_release);
10306
10307 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10308                   enum nft_data_types type, unsigned int len)
10309 {
10310         struct nlattr *nest;
10311         int err;
10312
10313         nest = nla_nest_start_noflag(skb, attr);
10314         if (nest == NULL)
10315                 return -1;
10316
10317         switch (type) {
10318         case NFT_DATA_VALUE:
10319                 err = nft_value_dump(skb, data, len);
10320                 break;
10321         case NFT_DATA_VERDICT:
10322                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10323                 break;
10324         default:
10325                 err = -EINVAL;
10326                 WARN_ON(1);
10327         }
10328
10329         nla_nest_end(skb, nest);
10330         return err;
10331 }
10332 EXPORT_SYMBOL_GPL(nft_data_dump);
10333
10334 int __nft_release_basechain(struct nft_ctx *ctx)
10335 {
10336         struct nft_rule *rule, *nr;
10337
10338         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10339                 return 0;
10340
10341         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10342         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10343                 list_del(&rule->list);
10344                 ctx->chain->use--;
10345                 nf_tables_rule_release(ctx, rule);
10346         }
10347         nft_chain_del(ctx->chain);
10348         ctx->table->use--;
10349         nf_tables_chain_destroy(ctx);
10350
10351         return 0;
10352 }
10353 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10354
10355 static void __nft_release_hook(struct net *net, struct nft_table *table)
10356 {
10357         struct nft_flowtable *flowtable;
10358         struct nft_chain *chain;
10359
10360         list_for_each_entry(chain, &table->chains, list)
10361                 __nf_tables_unregister_hook(net, table, chain, true);
10362         list_for_each_entry(flowtable, &table->flowtables, list)
10363                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10364                                                      true);
10365 }
10366
10367 static void __nft_release_hooks(struct net *net)
10368 {
10369         struct nftables_pernet *nft_net = nft_pernet(net);
10370         struct nft_table *table;
10371
10372         list_for_each_entry(table, &nft_net->tables, list) {
10373                 if (nft_table_has_owner(table))
10374                         continue;
10375
10376                 __nft_release_hook(net, table);
10377         }
10378 }
10379
10380 static void __nft_release_table(struct net *net, struct nft_table *table)
10381 {
10382         struct nft_flowtable *flowtable, *nf;
10383         struct nft_chain *chain, *nc;
10384         struct nft_object *obj, *ne;
10385         struct nft_rule *rule, *nr;
10386         struct nft_set *set, *ns;
10387         struct nft_ctx ctx = {
10388                 .net    = net,
10389                 .family = NFPROTO_NETDEV,
10390         };
10391
10392         ctx.family = table->family;
10393         ctx.table = table;
10394         list_for_each_entry(chain, &table->chains, list) {
10395                 ctx.chain = chain;
10396                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10397                         list_del(&rule->list);
10398                         chain->use--;
10399                         nf_tables_rule_release(&ctx, rule);
10400                 }
10401         }
10402         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10403                 list_del(&flowtable->list);
10404                 table->use--;
10405                 nf_tables_flowtable_destroy(flowtable);
10406         }
10407         list_for_each_entry_safe(set, ns, &table->sets, list) {
10408                 list_del(&set->list);
10409                 table->use--;
10410                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10411                         nft_map_deactivate(&ctx, set);
10412
10413                 nft_set_destroy(&ctx, set);
10414         }
10415         list_for_each_entry_safe(obj, ne, &table->objects, list) {
10416                 nft_obj_del(obj);
10417                 table->use--;
10418                 nft_obj_destroy(&ctx, obj);
10419         }
10420         list_for_each_entry_safe(chain, nc, &table->chains, list) {
10421                 ctx.chain = chain;
10422                 nft_chain_del(chain);
10423                 table->use--;
10424                 nf_tables_chain_destroy(&ctx);
10425         }
10426         nf_tables_table_destroy(&ctx);
10427 }
10428
10429 static void __nft_release_tables(struct net *net)
10430 {
10431         struct nftables_pernet *nft_net = nft_pernet(net);
10432         struct nft_table *table, *nt;
10433
10434         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10435                 if (nft_table_has_owner(table))
10436                         continue;
10437
10438                 list_del(&table->list);
10439
10440                 __nft_release_table(net, table);
10441         }
10442 }
10443
10444 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10445                             void *ptr)
10446 {
10447         struct nft_table *table, *to_delete[8];
10448         struct nftables_pernet *nft_net;
10449         struct netlink_notify *n = ptr;
10450         struct net *net = n->net;
10451         unsigned int deleted;
10452         bool restart = false;
10453
10454         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10455                 return NOTIFY_DONE;
10456
10457         nft_net = nft_pernet(net);
10458         deleted = 0;
10459         mutex_lock(&nft_net->commit_mutex);
10460         if (!list_empty(&nf_tables_destroy_list))
10461                 rcu_barrier();
10462 again:
10463         list_for_each_entry(table, &nft_net->tables, list) {
10464                 if (nft_table_has_owner(table) &&
10465                     n->portid == table->nlpid) {
10466                         __nft_release_hook(net, table);
10467                         list_del_rcu(&table->list);
10468                         to_delete[deleted++] = table;
10469                         if (deleted >= ARRAY_SIZE(to_delete))
10470                                 break;
10471                 }
10472         }
10473         if (deleted) {
10474                 restart = deleted >= ARRAY_SIZE(to_delete);
10475                 synchronize_rcu();
10476                 while (deleted)
10477                         __nft_release_table(net, to_delete[--deleted]);
10478
10479                 if (restart)
10480                         goto again;
10481         }
10482         mutex_unlock(&nft_net->commit_mutex);
10483
10484         return NOTIFY_DONE;
10485 }
10486
10487 static struct notifier_block nft_nl_notifier = {
10488         .notifier_call  = nft_rcv_nl_event,
10489 };
10490
10491 static int __net_init nf_tables_init_net(struct net *net)
10492 {
10493         struct nftables_pernet *nft_net = nft_pernet(net);
10494
10495         INIT_LIST_HEAD(&nft_net->tables);
10496         INIT_LIST_HEAD(&nft_net->commit_list);
10497         INIT_LIST_HEAD(&nft_net->binding_list);
10498         INIT_LIST_HEAD(&nft_net->module_list);
10499         INIT_LIST_HEAD(&nft_net->notify_list);
10500         mutex_init(&nft_net->commit_mutex);
10501         nft_net->base_seq = 1;
10502         nft_net->validate_state = NFT_VALIDATE_SKIP;
10503
10504         return 0;
10505 }
10506
10507 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10508 {
10509         struct nftables_pernet *nft_net = nft_pernet(net);
10510
10511         mutex_lock(&nft_net->commit_mutex);
10512         __nft_release_hooks(net);
10513         mutex_unlock(&nft_net->commit_mutex);
10514 }
10515
10516 static void __net_exit nf_tables_exit_net(struct net *net)
10517 {
10518         struct nftables_pernet *nft_net = nft_pernet(net);
10519
10520         mutex_lock(&nft_net->commit_mutex);
10521         if (!list_empty(&nft_net->commit_list) ||
10522             !list_empty(&nft_net->module_list))
10523                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10524         __nft_release_tables(net);
10525         mutex_unlock(&nft_net->commit_mutex);
10526         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10527         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10528         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10529 }
10530
10531 static struct pernet_operations nf_tables_net_ops = {
10532         .init           = nf_tables_init_net,
10533         .pre_exit       = nf_tables_pre_exit_net,
10534         .exit           = nf_tables_exit_net,
10535         .id             = &nf_tables_net_id,
10536         .size           = sizeof(struct nftables_pernet),
10537 };
10538
10539 static int __init nf_tables_module_init(void)
10540 {
10541         int err;
10542
10543         err = register_pernet_subsys(&nf_tables_net_ops);
10544         if (err < 0)
10545                 return err;
10546
10547         err = nft_chain_filter_init();
10548         if (err < 0)
10549                 goto err_chain_filter;
10550
10551         err = nf_tables_core_module_init();
10552         if (err < 0)
10553                 goto err_core_module;
10554
10555         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10556         if (err < 0)
10557                 goto err_netdev_notifier;
10558
10559         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10560         if (err < 0)
10561                 goto err_rht_objname;
10562
10563         err = nft_offload_init();
10564         if (err < 0)
10565                 goto err_offload;
10566
10567         err = netlink_register_notifier(&nft_nl_notifier);
10568         if (err < 0)
10569                 goto err_netlink_notifier;
10570
10571         /* must be last */
10572         err = nfnetlink_subsys_register(&nf_tables_subsys);
10573         if (err < 0)
10574                 goto err_nfnl_subsys;
10575
10576         nft_chain_route_init();
10577
10578         return err;
10579
10580 err_nfnl_subsys:
10581         netlink_unregister_notifier(&nft_nl_notifier);
10582 err_netlink_notifier:
10583         nft_offload_exit();
10584 err_offload:
10585         rhltable_destroy(&nft_objname_ht);
10586 err_rht_objname:
10587         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10588 err_netdev_notifier:
10589         nf_tables_core_module_exit();
10590 err_core_module:
10591         nft_chain_filter_fini();
10592 err_chain_filter:
10593         unregister_pernet_subsys(&nf_tables_net_ops);
10594         return err;
10595 }
10596
10597 static void __exit nf_tables_module_exit(void)
10598 {
10599         nfnetlink_subsys_unregister(&nf_tables_subsys);
10600         netlink_unregister_notifier(&nft_nl_notifier);
10601         nft_offload_exit();
10602         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10603         nft_chain_filter_fini();
10604         nft_chain_route_fini();
10605         unregister_pernet_subsys(&nf_tables_net_ops);
10606         cancel_work_sync(&trans_destroy_work);
10607         rcu_barrier();
10608         rhltable_destroy(&nft_objname_ht);
10609         nf_tables_core_module_exit();
10610 }
10611
10612 module_init(nf_tables_module_init);
10613 module_exit(nf_tables_module_exit);
10614
10615 MODULE_LICENSE("GPL");
10616 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10617 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);