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