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, u8 genmask)
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                     nft_active_genmask(chain, genmask))
2715                         return chain;
2716         }
2717         return ERR_PTR(-ENOENT);
2718 }
2719
2720 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2721                               const struct nlattr * const nla[])
2722 {
2723         struct nftables_pernet *nft_net = nft_pernet(info->net);
2724         struct netlink_ext_ack *extack = info->extack;
2725         u8 genmask = nft_genmask_next(info->net);
2726         u8 family = info->nfmsg->nfgen_family;
2727         struct nft_chain *chain = NULL;
2728         struct net *net = info->net;
2729         const struct nlattr *attr;
2730         struct nft_table *table;
2731         u8 policy = NF_ACCEPT;
2732         struct nft_ctx ctx;
2733         u64 handle = 0;
2734         u32 flags = 0;
2735
2736         lockdep_assert_held(&nft_net->commit_mutex);
2737
2738         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2739                                  NETLINK_CB(skb).portid);
2740         if (IS_ERR(table)) {
2741                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2742                 return PTR_ERR(table);
2743         }
2744
2745         chain = NULL;
2746         attr = nla[NFTA_CHAIN_NAME];
2747
2748         if (nla[NFTA_CHAIN_HANDLE]) {
2749                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2750                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2751                 if (IS_ERR(chain)) {
2752                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2753                         return PTR_ERR(chain);
2754                 }
2755                 attr = nla[NFTA_CHAIN_HANDLE];
2756         } else if (nla[NFTA_CHAIN_NAME]) {
2757                 chain = nft_chain_lookup(net, table, attr, genmask);
2758                 if (IS_ERR(chain)) {
2759                         if (PTR_ERR(chain) != -ENOENT) {
2760                                 NL_SET_BAD_ATTR(extack, attr);
2761                                 return PTR_ERR(chain);
2762                         }
2763                         chain = NULL;
2764                 }
2765         } else if (!nla[NFTA_CHAIN_ID]) {
2766                 return -EINVAL;
2767         }
2768
2769         if (nla[NFTA_CHAIN_POLICY]) {
2770                 if (chain != NULL &&
2771                     !nft_is_base_chain(chain)) {
2772                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2773                         return -EOPNOTSUPP;
2774                 }
2775
2776                 if (chain == NULL &&
2777                     nla[NFTA_CHAIN_HOOK] == NULL) {
2778                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2779                         return -EOPNOTSUPP;
2780                 }
2781
2782                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2783                 switch (policy) {
2784                 case NF_DROP:
2785                 case NF_ACCEPT:
2786                         break;
2787                 default:
2788                         return -EINVAL;
2789                 }
2790         }
2791
2792         if (nla[NFTA_CHAIN_FLAGS])
2793                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2794         else if (chain)
2795                 flags = chain->flags;
2796
2797         if (flags & ~NFT_CHAIN_FLAGS)
2798                 return -EOPNOTSUPP;
2799
2800         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2801
2802         if (chain != NULL) {
2803                 if (chain->flags & NFT_CHAIN_BINDING)
2804                         return -EINVAL;
2805
2806                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2807                         NL_SET_BAD_ATTR(extack, attr);
2808                         return -EEXIST;
2809                 }
2810                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2811                         return -EOPNOTSUPP;
2812
2813                 flags |= chain->flags & NFT_CHAIN_BASE;
2814                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2815                                           extack);
2816         }
2817
2818         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2819 }
2820
2821 static int nft_delchain_hook(struct nft_ctx *ctx,
2822                              struct nft_base_chain *basechain,
2823                              struct netlink_ext_ack *extack)
2824 {
2825         const struct nft_chain *chain = &basechain->chain;
2826         const struct nlattr * const *nla = ctx->nla;
2827         struct nft_chain_hook chain_hook = {};
2828         struct nft_hook *this, *hook;
2829         LIST_HEAD(chain_del_list);
2830         struct nft_trans *trans;
2831         int err;
2832
2833         err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2834                                    ctx->family, chain->flags, extack);
2835         if (err < 0)
2836                 return err;
2837
2838         list_for_each_entry(this, &chain_hook.list, list) {
2839                 hook = nft_hook_list_find(&basechain->hook_list, this);
2840                 if (!hook) {
2841                         err = -ENOENT;
2842                         goto err_chain_del_hook;
2843                 }
2844                 list_move(&hook->list, &chain_del_list);
2845         }
2846
2847         trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2848                                 sizeof(struct nft_trans_chain));
2849         if (!trans) {
2850                 err = -ENOMEM;
2851                 goto err_chain_del_hook;
2852         }
2853
2854         nft_trans_basechain(trans) = basechain;
2855         nft_trans_chain_update(trans) = true;
2856         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2857         list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2858         nft_chain_release_hook(&chain_hook);
2859
2860         nft_trans_commit_list_add_tail(ctx->net, trans);
2861
2862         return 0;
2863
2864 err_chain_del_hook:
2865         list_splice(&chain_del_list, &basechain->hook_list);
2866         nft_chain_release_hook(&chain_hook);
2867
2868         return err;
2869 }
2870
2871 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2872                               const struct nlattr * const nla[])
2873 {
2874         struct netlink_ext_ack *extack = info->extack;
2875         u8 genmask = nft_genmask_next(info->net);
2876         u8 family = info->nfmsg->nfgen_family;
2877         struct net *net = info->net;
2878         const struct nlattr *attr;
2879         struct nft_table *table;
2880         struct nft_chain *chain;
2881         struct nft_rule *rule;
2882         struct nft_ctx ctx;
2883         u64 handle;
2884         u32 use;
2885         int err;
2886
2887         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2888                                  NETLINK_CB(skb).portid);
2889         if (IS_ERR(table)) {
2890                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2891                 return PTR_ERR(table);
2892         }
2893
2894         if (nla[NFTA_CHAIN_HANDLE]) {
2895                 attr = nla[NFTA_CHAIN_HANDLE];
2896                 handle = be64_to_cpu(nla_get_be64(attr));
2897                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2898         } else {
2899                 attr = nla[NFTA_CHAIN_NAME];
2900                 chain = nft_chain_lookup(net, table, attr, genmask);
2901         }
2902         if (IS_ERR(chain)) {
2903                 if (PTR_ERR(chain) == -ENOENT &&
2904                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2905                         return 0;
2906
2907                 NL_SET_BAD_ATTR(extack, attr);
2908                 return PTR_ERR(chain);
2909         }
2910
2911         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2912
2913         if (nla[NFTA_CHAIN_HOOK]) {
2914                 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2915                         return -EOPNOTSUPP;
2916
2917                 if (nft_is_base_chain(chain)) {
2918                         struct nft_base_chain *basechain = nft_base_chain(chain);
2919
2920                         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2921                                 return nft_delchain_hook(&ctx, basechain, extack);
2922                 }
2923         }
2924
2925         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2926             chain->use > 0)
2927                 return -EBUSY;
2928
2929         use = chain->use;
2930         list_for_each_entry(rule, &chain->rules, list) {
2931                 if (!nft_is_active_next(net, rule))
2932                         continue;
2933                 use--;
2934
2935                 err = nft_delrule(&ctx, rule);
2936                 if (err < 0)
2937                         return err;
2938         }
2939
2940         /* There are rules and elements that are still holding references to us,
2941          * we cannot do a recursive removal in this case.
2942          */
2943         if (use > 0) {
2944                 NL_SET_BAD_ATTR(extack, attr);
2945                 return -EBUSY;
2946         }
2947
2948         return nft_delchain(&ctx);
2949 }
2950
2951 /*
2952  * Expressions
2953  */
2954
2955 /**
2956  *      nft_register_expr - register nf_tables expr type
2957  *      @type: expr type
2958  *
2959  *      Registers the expr type for use with nf_tables. Returns zero on
2960  *      success or a negative errno code otherwise.
2961  */
2962 int nft_register_expr(struct nft_expr_type *type)
2963 {
2964         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2965         if (type->family == NFPROTO_UNSPEC)
2966                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2967         else
2968                 list_add_rcu(&type->list, &nf_tables_expressions);
2969         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2970         return 0;
2971 }
2972 EXPORT_SYMBOL_GPL(nft_register_expr);
2973
2974 /**
2975  *      nft_unregister_expr - unregister nf_tables expr type
2976  *      @type: expr type
2977  *
2978  *      Unregisters the expr typefor use with nf_tables.
2979  */
2980 void nft_unregister_expr(struct nft_expr_type *type)
2981 {
2982         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2983         list_del_rcu(&type->list);
2984         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2985 }
2986 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2987
2988 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2989                                                        struct nlattr *nla)
2990 {
2991         const struct nft_expr_type *type, *candidate = NULL;
2992
2993         list_for_each_entry(type, &nf_tables_expressions, list) {
2994                 if (!nla_strcmp(nla, type->name)) {
2995                         if (!type->family && !candidate)
2996                                 candidate = type;
2997                         else if (type->family == family)
2998                                 candidate = type;
2999                 }
3000         }
3001         return candidate;
3002 }
3003
3004 #ifdef CONFIG_MODULES
3005 static int nft_expr_type_request_module(struct net *net, u8 family,
3006                                         struct nlattr *nla)
3007 {
3008         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3009                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3010                 return -EAGAIN;
3011
3012         return 0;
3013 }
3014 #endif
3015
3016 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3017                                                      u8 family,
3018                                                      struct nlattr *nla)
3019 {
3020         const struct nft_expr_type *type;
3021
3022         if (nla == NULL)
3023                 return ERR_PTR(-EINVAL);
3024
3025         type = __nft_expr_type_get(family, nla);
3026         if (type != NULL && try_module_get(type->owner))
3027                 return type;
3028
3029         lockdep_nfnl_nft_mutex_not_held();
3030 #ifdef CONFIG_MODULES
3031         if (type == NULL) {
3032                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3033                         return ERR_PTR(-EAGAIN);
3034
3035                 if (nft_request_module(net, "nft-expr-%.*s",
3036                                        nla_len(nla),
3037                                        (char *)nla_data(nla)) == -EAGAIN)
3038                         return ERR_PTR(-EAGAIN);
3039         }
3040 #endif
3041         return ERR_PTR(-ENOENT);
3042 }
3043
3044 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3045         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
3046                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
3047         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
3048 };
3049
3050 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3051                                     const struct nft_expr *expr, bool reset)
3052 {
3053         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3054                 goto nla_put_failure;
3055
3056         if (expr->ops->dump) {
3057                 struct nlattr *data = nla_nest_start_noflag(skb,
3058                                                             NFTA_EXPR_DATA);
3059                 if (data == NULL)
3060                         goto nla_put_failure;
3061                 if (expr->ops->dump(skb, expr, reset) < 0)
3062                         goto nla_put_failure;
3063                 nla_nest_end(skb, data);
3064         }
3065
3066         return skb->len;
3067
3068 nla_put_failure:
3069         return -1;
3070 };
3071
3072 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3073                   const struct nft_expr *expr, bool reset)
3074 {
3075         struct nlattr *nest;
3076
3077         nest = nla_nest_start_noflag(skb, attr);
3078         if (!nest)
3079                 goto nla_put_failure;
3080         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3081                 goto nla_put_failure;
3082         nla_nest_end(skb, nest);
3083         return 0;
3084
3085 nla_put_failure:
3086         return -1;
3087 }
3088
3089 struct nft_expr_info {
3090         const struct nft_expr_ops       *ops;
3091         const struct nlattr             *attr;
3092         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
3093 };
3094
3095 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3096                                 const struct nlattr *nla,
3097                                 struct nft_expr_info *info)
3098 {
3099         const struct nft_expr_type *type;
3100         const struct nft_expr_ops *ops;
3101         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3102         int err;
3103
3104         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3105                                           nft_expr_policy, NULL);
3106         if (err < 0)
3107                 return err;
3108
3109         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3110         if (IS_ERR(type))
3111                 return PTR_ERR(type);
3112
3113         if (tb[NFTA_EXPR_DATA]) {
3114                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3115                                                   tb[NFTA_EXPR_DATA],
3116                                                   type->policy, NULL);
3117                 if (err < 0)
3118                         goto err1;
3119         } else
3120                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3121
3122         if (type->select_ops != NULL) {
3123                 ops = type->select_ops(ctx,
3124                                        (const struct nlattr * const *)info->tb);
3125                 if (IS_ERR(ops)) {
3126                         err = PTR_ERR(ops);
3127 #ifdef CONFIG_MODULES
3128                         if (err == -EAGAIN)
3129                                 if (nft_expr_type_request_module(ctx->net,
3130                                                                  ctx->family,
3131                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
3132                                         err = -ENOENT;
3133 #endif
3134                         goto err1;
3135                 }
3136         } else
3137                 ops = type->ops;
3138
3139         info->attr = nla;
3140         info->ops = ops;
3141
3142         return 0;
3143
3144 err1:
3145         module_put(type->owner);
3146         return err;
3147 }
3148
3149 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3150                          struct nft_expr_info *info)
3151 {
3152         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3153         const struct nft_expr_type *type;
3154         int err;
3155
3156         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3157                                           nft_expr_policy, NULL);
3158         if (err < 0)
3159                 return err;
3160
3161         if (!tb[NFTA_EXPR_DATA])
3162                 return -EINVAL;
3163
3164         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3165         if (!type)
3166                 return -ENOENT;
3167
3168         if (!type->inner_ops)
3169                 return -EOPNOTSUPP;
3170
3171         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3172                                           tb[NFTA_EXPR_DATA],
3173                                           type->policy, NULL);
3174         if (err < 0)
3175                 goto err_nla_parse;
3176
3177         info->attr = nla;
3178         info->ops = type->inner_ops;
3179
3180         return 0;
3181
3182 err_nla_parse:
3183         return err;
3184 }
3185
3186 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3187                              const struct nft_expr_info *expr_info,
3188                              struct nft_expr *expr)
3189 {
3190         const struct nft_expr_ops *ops = expr_info->ops;
3191         int err;
3192
3193         expr->ops = ops;
3194         if (ops->init) {
3195                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3196                 if (err < 0)
3197                         goto err1;
3198         }
3199
3200         return 0;
3201 err1:
3202         expr->ops = NULL;
3203         return err;
3204 }
3205
3206 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3207                                    struct nft_expr *expr)
3208 {
3209         const struct nft_expr_type *type = expr->ops->type;
3210
3211         if (expr->ops->destroy)
3212                 expr->ops->destroy(ctx, expr);
3213         module_put(type->owner);
3214 }
3215
3216 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3217                                       const struct nlattr *nla)
3218 {
3219         struct nft_expr_info expr_info;
3220         struct nft_expr *expr;
3221         struct module *owner;
3222         int err;
3223
3224         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3225         if (err < 0)
3226                 goto err_expr_parse;
3227
3228         err = -EOPNOTSUPP;
3229         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3230                 goto err_expr_stateful;
3231
3232         err = -ENOMEM;
3233         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3234         if (expr == NULL)
3235                 goto err_expr_stateful;
3236
3237         err = nf_tables_newexpr(ctx, &expr_info, expr);
3238         if (err < 0)
3239                 goto err_expr_new;
3240
3241         return expr;
3242 err_expr_new:
3243         kfree(expr);
3244 err_expr_stateful:
3245         owner = expr_info.ops->type->owner;
3246         if (expr_info.ops->type->release_ops)
3247                 expr_info.ops->type->release_ops(expr_info.ops);
3248
3249         module_put(owner);
3250 err_expr_parse:
3251         return ERR_PTR(err);
3252 }
3253
3254 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3255 {
3256         int err;
3257
3258         if (src->ops->clone) {
3259                 dst->ops = src->ops;
3260                 err = src->ops->clone(dst, src);
3261                 if (err < 0)
3262                         return err;
3263         } else {
3264                 memcpy(dst, src, src->ops->size);
3265         }
3266
3267         __module_get(src->ops->type->owner);
3268
3269         return 0;
3270 }
3271
3272 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3273 {
3274         nf_tables_expr_destroy(ctx, expr);
3275         kfree(expr);
3276 }
3277
3278 /*
3279  * Rules
3280  */
3281
3282 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3283                                           u64 handle)
3284 {
3285         struct nft_rule *rule;
3286
3287         // FIXME: this sucks
3288         list_for_each_entry_rcu(rule, &chain->rules, list) {
3289                 if (handle == rule->handle)
3290                         return rule;
3291         }
3292
3293         return ERR_PTR(-ENOENT);
3294 }
3295
3296 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3297                                         const struct nlattr *nla)
3298 {
3299         if (nla == NULL)
3300                 return ERR_PTR(-EINVAL);
3301
3302         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3303 }
3304
3305 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3306         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3307                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3308         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3309                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3310         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3311         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3312         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3313         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3314         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3315                                     .len = NFT_USERDATA_MAXLEN },
3316         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3317         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3318         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3319 };
3320
3321 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3322                                     u32 portid, u32 seq, int event,
3323                                     u32 flags, int family,
3324                                     const struct nft_table *table,
3325                                     const struct nft_chain *chain,
3326                                     const struct nft_rule *rule, u64 handle,
3327                                     bool reset)
3328 {
3329         struct nlmsghdr *nlh;
3330         const struct nft_expr *expr, *next;
3331         struct nlattr *list;
3332         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3333
3334         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3335                            nft_base_seq(net));
3336         if (!nlh)
3337                 goto nla_put_failure;
3338
3339         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3340                 goto nla_put_failure;
3341         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3342                 goto nla_put_failure;
3343         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3344                          NFTA_RULE_PAD))
3345                 goto nla_put_failure;
3346
3347         if (event != NFT_MSG_DELRULE && handle) {
3348                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3349                                  NFTA_RULE_PAD))
3350                         goto nla_put_failure;
3351         }
3352
3353         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3354                 nft_flow_rule_stats(chain, rule);
3355
3356         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3357         if (list == NULL)
3358                 goto nla_put_failure;
3359         nft_rule_for_each_expr(expr, next, rule) {
3360                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3361                         goto nla_put_failure;
3362         }
3363         nla_nest_end(skb, list);
3364
3365         if (rule->udata) {
3366                 struct nft_userdata *udata = nft_userdata(rule);
3367                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3368                             udata->data) < 0)
3369                         goto nla_put_failure;
3370         }
3371
3372         nlmsg_end(skb, nlh);
3373         return 0;
3374
3375 nla_put_failure:
3376         nlmsg_trim(skb, nlh);
3377         return -1;
3378 }
3379
3380 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3381                                   const struct nft_rule *rule, int event)
3382 {
3383         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3384         const struct nft_rule *prule;
3385         struct sk_buff *skb;
3386         u64 handle = 0;
3387         u16 flags = 0;
3388         int err;
3389
3390         if (!ctx->report &&
3391             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3392                 return;
3393
3394         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3395         if (skb == NULL)
3396                 goto err;
3397
3398         if (event == NFT_MSG_NEWRULE &&
3399             !list_is_first(&rule->list, &ctx->chain->rules) &&
3400             !list_is_last(&rule->list, &ctx->chain->rules)) {
3401                 prule = list_prev_entry(rule, list);
3402                 handle = prule->handle;
3403         }
3404         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3405                 flags |= NLM_F_APPEND;
3406         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3407                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3408
3409         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3410                                        event, flags, ctx->family, ctx->table,
3411                                        ctx->chain, rule, handle, false);
3412         if (err < 0) {
3413                 kfree_skb(skb);
3414                 goto err;
3415         }
3416
3417         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3418         return;
3419 err:
3420         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3421 }
3422
3423 struct nft_rule_dump_ctx {
3424         char *table;
3425         char *chain;
3426 };
3427
3428 static int __nf_tables_dump_rules(struct sk_buff *skb,
3429                                   unsigned int *idx,
3430                                   struct netlink_callback *cb,
3431                                   const struct nft_table *table,
3432                                   const struct nft_chain *chain,
3433                                   bool reset)
3434 {
3435         struct net *net = sock_net(skb->sk);
3436         const struct nft_rule *rule, *prule;
3437         unsigned int s_idx = cb->args[0];
3438         u64 handle;
3439
3440         prule = NULL;
3441         list_for_each_entry_rcu(rule, &chain->rules, list) {
3442                 if (!nft_is_active(net, rule))
3443                         goto cont_skip;
3444                 if (*idx < s_idx)
3445                         goto cont;
3446                 if (*idx > s_idx) {
3447                         memset(&cb->args[1], 0,
3448                                         sizeof(cb->args) - sizeof(cb->args[0]));
3449                 }
3450                 if (prule)
3451                         handle = prule->handle;
3452                 else
3453                         handle = 0;
3454
3455                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3456                                         cb->nlh->nlmsg_seq,
3457                                         NFT_MSG_NEWRULE,
3458                                         NLM_F_MULTI | NLM_F_APPEND,
3459                                         table->family,
3460                                         table, chain, rule, handle, reset) < 0)
3461                         return 1;
3462
3463                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3464 cont:
3465                 prule = rule;
3466 cont_skip:
3467                 (*idx)++;
3468         }
3469         return 0;
3470 }
3471
3472 static int nf_tables_dump_rules(struct sk_buff *skb,
3473                                 struct netlink_callback *cb)
3474 {
3475         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3476         const struct nft_rule_dump_ctx *ctx = cb->data;
3477         struct nft_table *table;
3478         const struct nft_chain *chain;
3479         unsigned int idx = 0;
3480         struct net *net = sock_net(skb->sk);
3481         int family = nfmsg->nfgen_family;
3482         struct nftables_pernet *nft_net;
3483         bool reset = false;
3484
3485         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3486                 reset = true;
3487
3488         rcu_read_lock();
3489         nft_net = nft_pernet(net);
3490         cb->seq = READ_ONCE(nft_net->base_seq);
3491
3492         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3493                 if (family != NFPROTO_UNSPEC && family != table->family)
3494                         continue;
3495
3496                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3497                         continue;
3498
3499                 if (ctx && ctx->table && ctx->chain) {
3500                         struct rhlist_head *list, *tmp;
3501
3502                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3503                                                nft_chain_ht_params);
3504                         if (!list)
3505                                 goto done;
3506
3507                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3508                                 if (!nft_is_active(net, chain))
3509                                         continue;
3510                                 __nf_tables_dump_rules(skb, &idx,
3511                                                        cb, table, chain, reset);
3512                                 break;
3513                         }
3514                         goto done;
3515                 }
3516
3517                 list_for_each_entry_rcu(chain, &table->chains, list) {
3518                         if (__nf_tables_dump_rules(skb, &idx,
3519                                                    cb, table, chain, reset))
3520                                 goto done;
3521                 }
3522
3523                 if (ctx && ctx->table)
3524                         break;
3525         }
3526 done:
3527         rcu_read_unlock();
3528
3529         cb->args[0] = idx;
3530         return skb->len;
3531 }
3532
3533 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3534 {
3535         const struct nlattr * const *nla = cb->data;
3536         struct nft_rule_dump_ctx *ctx = NULL;
3537
3538         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3539                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3540                 if (!ctx)
3541                         return -ENOMEM;
3542
3543                 if (nla[NFTA_RULE_TABLE]) {
3544                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3545                                                         GFP_ATOMIC);
3546                         if (!ctx->table) {
3547                                 kfree(ctx);
3548                                 return -ENOMEM;
3549                         }
3550                 }
3551                 if (nla[NFTA_RULE_CHAIN]) {
3552                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3553                                                 GFP_ATOMIC);
3554                         if (!ctx->chain) {
3555                                 kfree(ctx->table);
3556                                 kfree(ctx);
3557                                 return -ENOMEM;
3558                         }
3559                 }
3560         }
3561
3562         cb->data = ctx;
3563         return 0;
3564 }
3565
3566 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3567 {
3568         struct nft_rule_dump_ctx *ctx = cb->data;
3569
3570         if (ctx) {
3571                 kfree(ctx->table);
3572                 kfree(ctx->chain);
3573                 kfree(ctx);
3574         }
3575         return 0;
3576 }
3577
3578 /* called with rcu_read_lock held */
3579 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3580                              const struct nlattr * const nla[])
3581 {
3582         struct netlink_ext_ack *extack = info->extack;
3583         u8 genmask = nft_genmask_cur(info->net);
3584         u8 family = info->nfmsg->nfgen_family;
3585         const struct nft_chain *chain;
3586         const struct nft_rule *rule;
3587         struct net *net = info->net;
3588         struct nft_table *table;
3589         struct sk_buff *skb2;
3590         bool reset = false;
3591         int err;
3592
3593         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3594                 struct netlink_dump_control c = {
3595                         .start= nf_tables_dump_rules_start,
3596                         .dump = nf_tables_dump_rules,
3597                         .done = nf_tables_dump_rules_done,
3598                         .module = THIS_MODULE,
3599                         .data = (void *)nla,
3600                 };
3601
3602                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3603         }
3604
3605         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3606         if (IS_ERR(table)) {
3607                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3608                 return PTR_ERR(table);
3609         }
3610
3611         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3612         if (IS_ERR(chain)) {
3613                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3614                 return PTR_ERR(chain);
3615         }
3616
3617         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3618         if (IS_ERR(rule)) {
3619                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3620                 return PTR_ERR(rule);
3621         }
3622
3623         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3624         if (!skb2)
3625                 return -ENOMEM;
3626
3627         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3628                 reset = true;
3629
3630         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3631                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3632                                        family, table, chain, rule, 0, reset);
3633         if (err < 0)
3634                 goto err_fill_rule_info;
3635
3636         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3637
3638 err_fill_rule_info:
3639         kfree_skb(skb2);
3640         return err;
3641 }
3642
3643 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3644 {
3645         struct nft_expr *expr, *next;
3646
3647         /*
3648          * Careful: some expressions might not be initialized in case this
3649          * is called on error from nf_tables_newrule().
3650          */
3651         expr = nft_expr_first(rule);
3652         while (nft_expr_more(rule, expr)) {
3653                 next = nft_expr_next(expr);
3654                 nf_tables_expr_destroy(ctx, expr);
3655                 expr = next;
3656         }
3657         kfree(rule);
3658 }
3659
3660 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3661 {
3662         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3663         nf_tables_rule_destroy(ctx, rule);
3664 }
3665
3666 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3667 {
3668         struct nft_expr *expr, *last;
3669         const struct nft_data *data;
3670         struct nft_rule *rule;
3671         int err;
3672
3673         if (ctx->level == NFT_JUMP_STACK_SIZE)
3674                 return -EMLINK;
3675
3676         list_for_each_entry(rule, &chain->rules, list) {
3677                 if (!nft_is_active_next(ctx->net, rule))
3678                         continue;
3679
3680                 nft_rule_for_each_expr(expr, last, rule) {
3681                         if (!expr->ops->validate)
3682                                 continue;
3683
3684                         err = expr->ops->validate(ctx, expr, &data);
3685                         if (err < 0)
3686                                 return err;
3687                 }
3688         }
3689
3690         return 0;
3691 }
3692 EXPORT_SYMBOL_GPL(nft_chain_validate);
3693
3694 static int nft_table_validate(struct net *net, const struct nft_table *table)
3695 {
3696         struct nft_chain *chain;
3697         struct nft_ctx ctx = {
3698                 .net    = net,
3699                 .family = table->family,
3700         };
3701         int err;
3702
3703         list_for_each_entry(chain, &table->chains, list) {
3704                 if (!nft_is_base_chain(chain))
3705                         continue;
3706
3707                 ctx.chain = chain;
3708                 err = nft_chain_validate(&ctx, chain);
3709                 if (err < 0)
3710                         return err;
3711
3712                 cond_resched();
3713         }
3714
3715         return 0;
3716 }
3717
3718 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3719                          const struct nft_set_iter *iter,
3720                          struct nft_set_elem *elem)
3721 {
3722         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3723         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3724         const struct nft_data *data;
3725         int err;
3726
3727         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3728             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3729                 return 0;
3730
3731         data = nft_set_ext_data(ext);
3732         switch (data->verdict.code) {
3733         case NFT_JUMP:
3734         case NFT_GOTO:
3735                 pctx->level++;
3736                 err = nft_chain_validate(ctx, data->verdict.chain);
3737                 if (err < 0)
3738                         return err;
3739                 pctx->level--;
3740                 break;
3741         default:
3742                 break;
3743         }
3744
3745         return 0;
3746 }
3747
3748 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3749 {
3750         u8 genmask = nft_genmask_next(ctx->net);
3751         struct nft_set_elem_catchall *catchall;
3752         struct nft_set_elem elem;
3753         struct nft_set_ext *ext;
3754         int ret = 0;
3755
3756         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3757                 ext = nft_set_elem_ext(set, catchall->elem);
3758                 if (!nft_set_elem_active(ext, genmask))
3759                         continue;
3760
3761                 elem.priv = catchall->elem;
3762                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3763                 if (ret < 0)
3764                         return ret;
3765         }
3766
3767         return ret;
3768 }
3769
3770 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3771                                              const struct nft_chain *chain,
3772                                              const struct nlattr *nla);
3773
3774 #define NFT_RULE_MAXEXPRS       128
3775
3776 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3777                              const struct nlattr * const nla[])
3778 {
3779         struct nftables_pernet *nft_net = nft_pernet(info->net);
3780         struct netlink_ext_ack *extack = info->extack;
3781         unsigned int size, i, n, ulen = 0, usize = 0;
3782         u8 genmask = nft_genmask_next(info->net);
3783         struct nft_rule *rule, *old_rule = NULL;
3784         struct nft_expr_info *expr_info = NULL;
3785         u8 family = info->nfmsg->nfgen_family;
3786         struct nft_flow_rule *flow = NULL;
3787         struct net *net = info->net;
3788         struct nft_userdata *udata;
3789         struct nft_table *table;
3790         struct nft_chain *chain;
3791         struct nft_trans *trans;
3792         u64 handle, pos_handle;
3793         struct nft_expr *expr;
3794         struct nft_ctx ctx;
3795         struct nlattr *tmp;
3796         int err, rem;
3797
3798         lockdep_assert_held(&nft_net->commit_mutex);
3799
3800         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3801                                  NETLINK_CB(skb).portid);
3802         if (IS_ERR(table)) {
3803                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3804                 return PTR_ERR(table);
3805         }
3806
3807         if (nla[NFTA_RULE_CHAIN]) {
3808                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3809                                          genmask);
3810                 if (IS_ERR(chain)) {
3811                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3812                         return PTR_ERR(chain);
3813                 }
3814
3815         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3816                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3817                                               genmask);
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 (nft_chain_is_bound(chain))
3827                 return -EOPNOTSUPP;
3828
3829         if (nla[NFTA_RULE_HANDLE]) {
3830                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3831                 rule = __nft_rule_lookup(chain, handle);
3832                 if (IS_ERR(rule)) {
3833                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3834                         return PTR_ERR(rule);
3835                 }
3836
3837                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3838                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3839                         return -EEXIST;
3840                 }
3841                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3842                         old_rule = rule;
3843                 else
3844                         return -EOPNOTSUPP;
3845         } else {
3846                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3847                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3848                         return -EINVAL;
3849                 handle = nf_tables_alloc_handle(table);
3850
3851                 if (nla[NFTA_RULE_POSITION]) {
3852                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3853                         old_rule = __nft_rule_lookup(chain, pos_handle);
3854                         if (IS_ERR(old_rule)) {
3855                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3856                                 return PTR_ERR(old_rule);
3857                         }
3858                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3859                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3860                         if (IS_ERR(old_rule)) {
3861                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3862                                 return PTR_ERR(old_rule);
3863                         }
3864                 }
3865         }
3866
3867         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3868
3869         n = 0;
3870         size = 0;
3871         if (nla[NFTA_RULE_EXPRESSIONS]) {
3872                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3873                                            sizeof(struct nft_expr_info),
3874                                            GFP_KERNEL);
3875                 if (!expr_info)
3876                         return -ENOMEM;
3877
3878                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3879                         err = -EINVAL;
3880                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3881                                 goto err_release_expr;
3882                         if (n == NFT_RULE_MAXEXPRS)
3883                                 goto err_release_expr;
3884                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3885                         if (err < 0) {
3886                                 NL_SET_BAD_ATTR(extack, tmp);
3887                                 goto err_release_expr;
3888                         }
3889                         size += expr_info[n].ops->size;
3890                         n++;
3891                 }
3892         }
3893         /* Check for overflow of dlen field */
3894         err = -EFBIG;
3895         if (size >= 1 << 12)
3896                 goto err_release_expr;
3897
3898         if (nla[NFTA_RULE_USERDATA]) {
3899                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3900                 if (ulen > 0)
3901                         usize = sizeof(struct nft_userdata) + ulen;
3902         }
3903
3904         err = -ENOMEM;
3905         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3906         if (rule == NULL)
3907                 goto err_release_expr;
3908
3909         nft_activate_next(net, rule);
3910
3911         rule->handle = handle;
3912         rule->dlen   = size;
3913         rule->udata  = ulen ? 1 : 0;
3914
3915         if (ulen) {
3916                 udata = nft_userdata(rule);
3917                 udata->len = ulen - 1;
3918                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3919         }
3920
3921         expr = nft_expr_first(rule);
3922         for (i = 0; i < n; i++) {
3923                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3924                 if (err < 0) {
3925                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3926                         goto err_release_rule;
3927                 }
3928
3929                 if (expr_info[i].ops->validate)
3930                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
3931
3932                 expr_info[i].ops = NULL;
3933                 expr = nft_expr_next(expr);
3934         }
3935
3936         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3937                 flow = nft_flow_rule_create(net, rule);
3938                 if (IS_ERR(flow)) {
3939                         err = PTR_ERR(flow);
3940                         goto err_release_rule;
3941                 }
3942         }
3943
3944         if (!nft_use_inc(&chain->use)) {
3945                 err = -EMFILE;
3946                 goto err_release_rule;
3947         }
3948
3949         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3950                 err = nft_delrule(&ctx, old_rule);
3951                 if (err < 0)
3952                         goto err_destroy_flow_rule;
3953
3954                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3955                 if (trans == NULL) {
3956                         err = -ENOMEM;
3957                         goto err_destroy_flow_rule;
3958                 }
3959                 list_add_tail_rcu(&rule->list, &old_rule->list);
3960         } else {
3961                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3962                 if (!trans) {
3963                         err = -ENOMEM;
3964                         goto err_destroy_flow_rule;
3965                 }
3966
3967                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3968                         if (old_rule)
3969                                 list_add_rcu(&rule->list, &old_rule->list);
3970                         else
3971                                 list_add_tail_rcu(&rule->list, &chain->rules);
3972                  } else {
3973                         if (old_rule)
3974                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3975                         else
3976                                 list_add_rcu(&rule->list, &chain->rules);
3977                 }
3978         }
3979         kvfree(expr_info);
3980
3981         if (flow)
3982                 nft_trans_flow_rule(trans) = flow;
3983
3984         if (table->validate_state == NFT_VALIDATE_DO)
3985                 return nft_table_validate(net, table);
3986
3987         return 0;
3988
3989 err_destroy_flow_rule:
3990         nft_use_dec_restore(&chain->use);
3991         if (flow)
3992                 nft_flow_rule_destroy(flow);
3993 err_release_rule:
3994         nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
3995         nf_tables_rule_destroy(&ctx, rule);
3996 err_release_expr:
3997         for (i = 0; i < n; i++) {
3998                 if (expr_info[i].ops) {
3999                         module_put(expr_info[i].ops->type->owner);
4000                         if (expr_info[i].ops->type->release_ops)
4001                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4002                 }
4003         }
4004         kvfree(expr_info);
4005
4006         return err;
4007 }
4008
4009 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4010                                              const struct nft_chain *chain,
4011                                              const struct nlattr *nla)
4012 {
4013         struct nftables_pernet *nft_net = nft_pernet(net);
4014         u32 id = ntohl(nla_get_be32(nla));
4015         struct nft_trans *trans;
4016
4017         list_for_each_entry(trans, &nft_net->commit_list, list) {
4018                 if (trans->msg_type == NFT_MSG_NEWRULE &&
4019                     trans->ctx.chain == chain &&
4020                     id == nft_trans_rule_id(trans))
4021                         return nft_trans_rule(trans);
4022         }
4023         return ERR_PTR(-ENOENT);
4024 }
4025
4026 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4027                              const struct nlattr * const nla[])
4028 {
4029         struct netlink_ext_ack *extack = info->extack;
4030         u8 genmask = nft_genmask_next(info->net);
4031         u8 family = info->nfmsg->nfgen_family;
4032         struct nft_chain *chain = NULL;
4033         struct net *net = info->net;
4034         struct nft_table *table;
4035         struct nft_rule *rule;
4036         struct nft_ctx ctx;
4037         int err = 0;
4038
4039         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4040                                  NETLINK_CB(skb).portid);
4041         if (IS_ERR(table)) {
4042                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4043                 return PTR_ERR(table);
4044         }
4045
4046         if (nla[NFTA_RULE_CHAIN]) {
4047                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4048                                          genmask);
4049                 if (IS_ERR(chain)) {
4050                         if (PTR_ERR(chain) == -ENOENT &&
4051                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4052                                 return 0;
4053
4054                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4055                         return PTR_ERR(chain);
4056                 }
4057                 if (nft_chain_is_bound(chain))
4058                         return -EOPNOTSUPP;
4059         }
4060
4061         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4062
4063         if (chain) {
4064                 if (nla[NFTA_RULE_HANDLE]) {
4065                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4066                         if (IS_ERR(rule)) {
4067                                 if (PTR_ERR(rule) == -ENOENT &&
4068                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4069                                         return 0;
4070
4071                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4072                                 return PTR_ERR(rule);
4073                         }
4074
4075                         err = nft_delrule(&ctx, rule);
4076                 } else if (nla[NFTA_RULE_ID]) {
4077                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4078                         if (IS_ERR(rule)) {
4079                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4080                                 return PTR_ERR(rule);
4081                         }
4082
4083                         err = nft_delrule(&ctx, rule);
4084                 } else {
4085                         err = nft_delrule_by_chain(&ctx);
4086                 }
4087         } else {
4088                 list_for_each_entry(chain, &table->chains, list) {
4089                         if (!nft_is_active_next(net, chain))
4090                                 continue;
4091                         if (nft_chain_is_bound(chain))
4092                                 continue;
4093
4094                         ctx.chain = chain;
4095                         err = nft_delrule_by_chain(&ctx);
4096                         if (err < 0)
4097                                 break;
4098                 }
4099         }
4100
4101         return err;
4102 }
4103
4104 /*
4105  * Sets
4106  */
4107 static const struct nft_set_type *nft_set_types[] = {
4108         &nft_set_hash_fast_type,
4109         &nft_set_hash_type,
4110         &nft_set_rhash_type,
4111         &nft_set_bitmap_type,
4112         &nft_set_rbtree_type,
4113 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4114         &nft_set_pipapo_avx2_type,
4115 #endif
4116         &nft_set_pipapo_type,
4117 };
4118
4119 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
4120                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4121                                  NFT_SET_EVAL)
4122
4123 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4124 {
4125         return (flags & type->features) == (flags & NFT_SET_FEATURES);
4126 }
4127
4128 /*
4129  * Select a set implementation based on the data characteristics and the
4130  * given policy. The total memory use might not be known if no size is
4131  * given, in that case the amount of memory per element is used.
4132  */
4133 static const struct nft_set_ops *
4134 nft_select_set_ops(const struct nft_ctx *ctx,
4135                    const struct nlattr * const nla[],
4136                    const struct nft_set_desc *desc)
4137 {
4138         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4139         const struct nft_set_ops *ops, *bops;
4140         struct nft_set_estimate est, best;
4141         const struct nft_set_type *type;
4142         u32 flags = 0;
4143         int i;
4144
4145         lockdep_assert_held(&nft_net->commit_mutex);
4146         lockdep_nfnl_nft_mutex_not_held();
4147
4148         if (nla[NFTA_SET_FLAGS] != NULL)
4149                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4150
4151         bops        = NULL;
4152         best.size   = ~0;
4153         best.lookup = ~0;
4154         best.space  = ~0;
4155
4156         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4157                 type = nft_set_types[i];
4158                 ops = &type->ops;
4159
4160                 if (!nft_set_ops_candidate(type, flags))
4161                         continue;
4162                 if (!ops->estimate(desc, flags, &est))
4163                         continue;
4164
4165                 switch (desc->policy) {
4166                 case NFT_SET_POL_PERFORMANCE:
4167                         if (est.lookup < best.lookup)
4168                                 break;
4169                         if (est.lookup == best.lookup &&
4170                             est.space < best.space)
4171                                 break;
4172                         continue;
4173                 case NFT_SET_POL_MEMORY:
4174                         if (!desc->size) {
4175                                 if (est.space < best.space)
4176                                         break;
4177                                 if (est.space == best.space &&
4178                                     est.lookup < best.lookup)
4179                                         break;
4180                         } else if (est.size < best.size || !bops) {
4181                                 break;
4182                         }
4183                         continue;
4184                 default:
4185                         break;
4186                 }
4187
4188                 bops = ops;
4189                 best = est;
4190         }
4191
4192         if (bops != NULL)
4193                 return bops;
4194
4195         return ERR_PTR(-EOPNOTSUPP);
4196 }
4197
4198 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4199         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4200                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4201         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4202                                             .len = NFT_SET_MAXNAMELEN - 1 },
4203         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4204         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4205         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4206         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4207         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4208         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4209         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4210         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4211         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4212         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4213         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4214                                             .len  = NFT_USERDATA_MAXLEN },
4215         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4216         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4217         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4218         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
4219 };
4220
4221 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4222         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4223         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
4224 };
4225
4226 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4227                                       const struct nlattr *nla, u8 genmask)
4228 {
4229         struct nft_set *set;
4230
4231         if (nla == NULL)
4232                 return ERR_PTR(-EINVAL);
4233
4234         list_for_each_entry_rcu(set, &table->sets, list) {
4235                 if (!nla_strcmp(nla, set->name) &&
4236                     nft_active_genmask(set, genmask))
4237                         return set;
4238         }
4239         return ERR_PTR(-ENOENT);
4240 }
4241
4242 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4243                                                const struct nlattr *nla,
4244                                                u8 genmask)
4245 {
4246         struct nft_set *set;
4247
4248         list_for_each_entry(set, &table->sets, list) {
4249                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4250                     nft_active_genmask(set, genmask))
4251                         return set;
4252         }
4253         return ERR_PTR(-ENOENT);
4254 }
4255
4256 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4257                                            const struct nft_table *table,
4258                                            const struct nlattr *nla, u8 genmask)
4259 {
4260         struct nftables_pernet *nft_net = nft_pernet(net);
4261         u32 id = ntohl(nla_get_be32(nla));
4262         struct nft_trans *trans;
4263
4264         list_for_each_entry(trans, &nft_net->commit_list, list) {
4265                 if (trans->msg_type == NFT_MSG_NEWSET) {
4266                         struct nft_set *set = nft_trans_set(trans);
4267
4268                         if (id == nft_trans_set_id(trans) &&
4269                             set->table == table &&
4270                             nft_active_genmask(set, genmask))
4271                                 return set;
4272                 }
4273         }
4274         return ERR_PTR(-ENOENT);
4275 }
4276
4277 struct nft_set *nft_set_lookup_global(const struct net *net,
4278                                       const struct nft_table *table,
4279                                       const struct nlattr *nla_set_name,
4280                                       const struct nlattr *nla_set_id,
4281                                       u8 genmask)
4282 {
4283         struct nft_set *set;
4284
4285         set = nft_set_lookup(table, nla_set_name, genmask);
4286         if (IS_ERR(set)) {
4287                 if (!nla_set_id)
4288                         return set;
4289
4290                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4291         }
4292         return set;
4293 }
4294 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4295
4296 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4297                                     const char *name)
4298 {
4299         const struct nft_set *i;
4300         const char *p;
4301         unsigned long *inuse;
4302         unsigned int n = 0, min = 0;
4303
4304         p = strchr(name, '%');
4305         if (p != NULL) {
4306                 if (p[1] != 'd' || strchr(p + 2, '%'))
4307                         return -EINVAL;
4308
4309                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4310                 if (inuse == NULL)
4311                         return -ENOMEM;
4312 cont:
4313                 list_for_each_entry(i, &ctx->table->sets, list) {
4314                         int tmp;
4315
4316                         if (!nft_is_active_next(ctx->net, i))
4317                                 continue;
4318                         if (!sscanf(i->name, name, &tmp))
4319                                 continue;
4320                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4321                                 continue;
4322
4323                         set_bit(tmp - min, inuse);
4324                 }
4325
4326                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4327                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4328                         min += BITS_PER_BYTE * PAGE_SIZE;
4329                         memset(inuse, 0, PAGE_SIZE);
4330                         goto cont;
4331                 }
4332                 free_page((unsigned long)inuse);
4333         }
4334
4335         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4336         if (!set->name)
4337                 return -ENOMEM;
4338
4339         list_for_each_entry(i, &ctx->table->sets, list) {
4340                 if (!nft_is_active_next(ctx->net, i))
4341                         continue;
4342                 if (!strcmp(set->name, i->name)) {
4343                         kfree(set->name);
4344                         set->name = NULL;
4345                         return -ENFILE;
4346                 }
4347         }
4348         return 0;
4349 }
4350
4351 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4352 {
4353         u64 ms = be64_to_cpu(nla_get_be64(nla));
4354         u64 max = (u64)(~((u64)0));
4355
4356         max = div_u64(max, NSEC_PER_MSEC);
4357         if (ms >= max)
4358                 return -ERANGE;
4359
4360         ms *= NSEC_PER_MSEC;
4361         *result = nsecs_to_jiffies64(ms);
4362         return 0;
4363 }
4364
4365 __be64 nf_jiffies64_to_msecs(u64 input)
4366 {
4367         return cpu_to_be64(jiffies64_to_msecs(input));
4368 }
4369
4370 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4371                                      const struct nft_set *set)
4372 {
4373         struct nlattr *concat, *field;
4374         int i;
4375
4376         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4377         if (!concat)
4378                 return -ENOMEM;
4379
4380         for (i = 0; i < set->field_count; i++) {
4381                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4382                 if (!field)
4383                         return -ENOMEM;
4384
4385                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4386                                  htonl(set->field_len[i])))
4387                         return -ENOMEM;
4388
4389                 nla_nest_end(skb, field);
4390         }
4391
4392         nla_nest_end(skb, concat);
4393
4394         return 0;
4395 }
4396
4397 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4398                               const struct nft_set *set, u16 event, u16 flags)
4399 {
4400         u64 timeout = READ_ONCE(set->timeout);
4401         u32 gc_int = READ_ONCE(set->gc_int);
4402         u32 portid = ctx->portid;
4403         struct nlmsghdr *nlh;
4404         struct nlattr *nest;
4405         u32 seq = ctx->seq;
4406         int i;
4407
4408         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4409         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4410                            NFNETLINK_V0, nft_base_seq(ctx->net));
4411         if (!nlh)
4412                 goto nla_put_failure;
4413
4414         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4415                 goto nla_put_failure;
4416         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4417                 goto nla_put_failure;
4418         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4419                          NFTA_SET_PAD))
4420                 goto nla_put_failure;
4421
4422         if (event == NFT_MSG_DELSET) {
4423                 nlmsg_end(skb, nlh);
4424                 return 0;
4425         }
4426
4427         if (set->flags != 0)
4428                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4429                         goto nla_put_failure;
4430
4431         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4432                 goto nla_put_failure;
4433         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4434                 goto nla_put_failure;
4435         if (set->flags & NFT_SET_MAP) {
4436                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4437                         goto nla_put_failure;
4438                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4439                         goto nla_put_failure;
4440         }
4441         if (set->flags & NFT_SET_OBJECT &&
4442             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4443                 goto nla_put_failure;
4444
4445         if (timeout &&
4446             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4447                          nf_jiffies64_to_msecs(timeout),
4448                          NFTA_SET_PAD))
4449                 goto nla_put_failure;
4450         if (gc_int &&
4451             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4452                 goto nla_put_failure;
4453
4454         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4455                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4456                         goto nla_put_failure;
4457         }
4458
4459         if (set->udata &&
4460             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4461                 goto nla_put_failure;
4462
4463         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4464         if (!nest)
4465                 goto nla_put_failure;
4466         if (set->size &&
4467             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4468                 goto nla_put_failure;
4469
4470         if (set->field_count > 1 &&
4471             nf_tables_fill_set_concat(skb, set))
4472                 goto nla_put_failure;
4473
4474         nla_nest_end(skb, nest);
4475
4476         if (set->num_exprs == 1) {
4477                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4478                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4479                         goto nla_put_failure;
4480
4481                 nla_nest_end(skb, nest);
4482         } else if (set->num_exprs > 1) {
4483                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4484                 if (nest == NULL)
4485                         goto nla_put_failure;
4486
4487                 for (i = 0; i < set->num_exprs; i++) {
4488                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4489                                           set->exprs[i], false) < 0)
4490                                 goto nla_put_failure;
4491                 }
4492                 nla_nest_end(skb, nest);
4493         }
4494
4495         nlmsg_end(skb, nlh);
4496         return 0;
4497
4498 nla_put_failure:
4499         nlmsg_trim(skb, nlh);
4500         return -1;
4501 }
4502
4503 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4504                                  const struct nft_set *set, int event,
4505                                  gfp_t gfp_flags)
4506 {
4507         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4508         u32 portid = ctx->portid;
4509         struct sk_buff *skb;
4510         u16 flags = 0;
4511         int err;
4512
4513         if (!ctx->report &&
4514             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4515                 return;
4516
4517         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4518         if (skb == NULL)
4519                 goto err;
4520
4521         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4522                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4523
4524         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4525         if (err < 0) {
4526                 kfree_skb(skb);
4527                 goto err;
4528         }
4529
4530         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4531         return;
4532 err:
4533         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4534 }
4535
4536 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4537 {
4538         const struct nft_set *set;
4539         unsigned int idx, s_idx = cb->args[0];
4540         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4541         struct net *net = sock_net(skb->sk);
4542         struct nft_ctx *ctx = cb->data, ctx_set;
4543         struct nftables_pernet *nft_net;
4544
4545         if (cb->args[1])
4546                 return skb->len;
4547
4548         rcu_read_lock();
4549         nft_net = nft_pernet(net);
4550         cb->seq = READ_ONCE(nft_net->base_seq);
4551
4552         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4553                 if (ctx->family != NFPROTO_UNSPEC &&
4554                     ctx->family != table->family)
4555                         continue;
4556
4557                 if (ctx->table && ctx->table != table)
4558                         continue;
4559
4560                 if (cur_table) {
4561                         if (cur_table != table)
4562                                 continue;
4563
4564                         cur_table = NULL;
4565                 }
4566                 idx = 0;
4567                 list_for_each_entry_rcu(set, &table->sets, list) {
4568                         if (idx < s_idx)
4569                                 goto cont;
4570                         if (!nft_is_active(net, set))
4571                                 goto cont;
4572
4573                         ctx_set = *ctx;
4574                         ctx_set.table = table;
4575                         ctx_set.family = table->family;
4576
4577                         if (nf_tables_fill_set(skb, &ctx_set, set,
4578                                                NFT_MSG_NEWSET,
4579                                                NLM_F_MULTI) < 0) {
4580                                 cb->args[0] = idx;
4581                                 cb->args[2] = (unsigned long) table;
4582                                 goto done;
4583                         }
4584                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4585 cont:
4586                         idx++;
4587                 }
4588                 if (s_idx)
4589                         s_idx = 0;
4590         }
4591         cb->args[1] = 1;
4592 done:
4593         rcu_read_unlock();
4594         return skb->len;
4595 }
4596
4597 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4598 {
4599         struct nft_ctx *ctx_dump = NULL;
4600
4601         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4602         if (ctx_dump == NULL)
4603                 return -ENOMEM;
4604
4605         cb->data = ctx_dump;
4606         return 0;
4607 }
4608
4609 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4610 {
4611         kfree(cb->data);
4612         return 0;
4613 }
4614
4615 /* called with rcu_read_lock held */
4616 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4617                             const struct nlattr * const nla[])
4618 {
4619         struct netlink_ext_ack *extack = info->extack;
4620         u8 genmask = nft_genmask_cur(info->net);
4621         u8 family = info->nfmsg->nfgen_family;
4622         struct nft_table *table = NULL;
4623         struct net *net = info->net;
4624         const struct nft_set *set;
4625         struct sk_buff *skb2;
4626         struct nft_ctx ctx;
4627         int err;
4628
4629         if (nla[NFTA_SET_TABLE]) {
4630                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4631                                          genmask, 0);
4632                 if (IS_ERR(table)) {
4633                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4634                         return PTR_ERR(table);
4635                 }
4636         }
4637
4638         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4639
4640         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4641                 struct netlink_dump_control c = {
4642                         .start = nf_tables_dump_sets_start,
4643                         .dump = nf_tables_dump_sets,
4644                         .done = nf_tables_dump_sets_done,
4645                         .data = &ctx,
4646                         .module = THIS_MODULE,
4647                 };
4648
4649                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4650         }
4651
4652         /* Only accept unspec with dump */
4653         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4654                 return -EAFNOSUPPORT;
4655         if (!nla[NFTA_SET_TABLE])
4656                 return -EINVAL;
4657
4658         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4659         if (IS_ERR(set))
4660                 return PTR_ERR(set);
4661
4662         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4663         if (skb2 == NULL)
4664                 return -ENOMEM;
4665
4666         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4667         if (err < 0)
4668                 goto err_fill_set_info;
4669
4670         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4671
4672 err_fill_set_info:
4673         kfree_skb(skb2);
4674         return err;
4675 }
4676
4677 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4678         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4679 };
4680
4681 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4682                                      struct nft_set_desc *desc)
4683 {
4684         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4685         u32 len;
4686         int err;
4687
4688         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4689                 return -E2BIG;
4690
4691         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4692                                           nft_concat_policy, NULL);
4693         if (err < 0)
4694                 return err;
4695
4696         if (!tb[NFTA_SET_FIELD_LEN])
4697                 return -EINVAL;
4698
4699         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4700         if (!len || len > U8_MAX)
4701                 return -EINVAL;
4702
4703         desc->field_len[desc->field_count++] = len;
4704
4705         return 0;
4706 }
4707
4708 static int nft_set_desc_concat(struct nft_set_desc *desc,
4709                                const struct nlattr *nla)
4710 {
4711         struct nlattr *attr;
4712         u32 num_regs = 0;
4713         int rem, err, i;
4714
4715         nla_for_each_nested(attr, nla, rem) {
4716                 if (nla_type(attr) != NFTA_LIST_ELEM)
4717                         return -EINVAL;
4718
4719                 err = nft_set_desc_concat_parse(attr, desc);
4720                 if (err < 0)
4721                         return err;
4722         }
4723
4724         for (i = 0; i < desc->field_count; i++)
4725                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4726
4727         if (num_regs > NFT_REG32_COUNT)
4728                 return -E2BIG;
4729
4730         return 0;
4731 }
4732
4733 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4734                                     const struct nlattr *nla)
4735 {
4736         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4737         int err;
4738
4739         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4740                                           nft_set_desc_policy, NULL);
4741         if (err < 0)
4742                 return err;
4743
4744         if (da[NFTA_SET_DESC_SIZE] != NULL)
4745                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4746         if (da[NFTA_SET_DESC_CONCAT])
4747                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4748
4749         return err;
4750 }
4751
4752 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4753                               const struct nlattr * const *nla,
4754                               struct nft_expr **exprs, int *num_exprs,
4755                               u32 flags)
4756 {
4757         struct nft_expr *expr;
4758         int err, i;
4759
4760         if (nla[NFTA_SET_EXPR]) {
4761                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4762                 if (IS_ERR(expr)) {
4763                         err = PTR_ERR(expr);
4764                         goto err_set_expr_alloc;
4765                 }
4766                 exprs[0] = expr;
4767                 (*num_exprs)++;
4768         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4769                 struct nlattr *tmp;
4770                 int left;
4771
4772                 if (!(flags & NFT_SET_EXPR)) {
4773                         err = -EINVAL;
4774                         goto err_set_expr_alloc;
4775                 }
4776                 i = 0;
4777                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4778                         if (i == NFT_SET_EXPR_MAX) {
4779                                 err = -E2BIG;
4780                                 goto err_set_expr_alloc;
4781                         }
4782                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4783                                 err = -EINVAL;
4784                                 goto err_set_expr_alloc;
4785                         }
4786                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4787                         if (IS_ERR(expr)) {
4788                                 err = PTR_ERR(expr);
4789                                 goto err_set_expr_alloc;
4790                         }
4791                         exprs[i++] = expr;
4792                         (*num_exprs)++;
4793                 }
4794         }
4795
4796         return 0;
4797
4798 err_set_expr_alloc:
4799         for (i = 0; i < *num_exprs; i++)
4800                 nft_expr_destroy(ctx, exprs[i]);
4801
4802         return err;
4803 }
4804
4805 static bool nft_set_is_same(const struct nft_set *set,
4806                             const struct nft_set_desc *desc,
4807                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4808 {
4809         int i;
4810
4811         if (set->ktype != desc->ktype ||
4812             set->dtype != desc->dtype ||
4813             set->flags != flags ||
4814             set->klen != desc->klen ||
4815             set->dlen != desc->dlen ||
4816             set->field_count != desc->field_count ||
4817             set->num_exprs != num_exprs)
4818                 return false;
4819
4820         for (i = 0; i < desc->field_count; i++) {
4821                 if (set->field_len[i] != desc->field_len[i])
4822                         return false;
4823         }
4824
4825         for (i = 0; i < num_exprs; i++) {
4826                 if (set->exprs[i]->ops != exprs[i]->ops)
4827                         return false;
4828         }
4829
4830         return true;
4831 }
4832
4833 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4834                             const struct nlattr * const nla[])
4835 {
4836         struct netlink_ext_ack *extack = info->extack;
4837         u8 genmask = nft_genmask_next(info->net);
4838         u8 family = info->nfmsg->nfgen_family;
4839         const struct nft_set_ops *ops;
4840         struct net *net = info->net;
4841         struct nft_set_desc desc;
4842         struct nft_table *table;
4843         unsigned char *udata;
4844         struct nft_set *set;
4845         struct nft_ctx ctx;
4846         size_t alloc_size;
4847         int num_exprs = 0;
4848         char *name;
4849         int err, i;
4850         u16 udlen;
4851         u32 flags;
4852         u64 size;
4853
4854         if (nla[NFTA_SET_TABLE] == NULL ||
4855             nla[NFTA_SET_NAME] == NULL ||
4856             nla[NFTA_SET_KEY_LEN] == NULL ||
4857             nla[NFTA_SET_ID] == NULL)
4858                 return -EINVAL;
4859
4860         memset(&desc, 0, sizeof(desc));
4861
4862         desc.ktype = NFT_DATA_VALUE;
4863         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4864                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4865                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4866                         return -EINVAL;
4867         }
4868
4869         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4870         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4871                 return -EINVAL;
4872
4873         flags = 0;
4874         if (nla[NFTA_SET_FLAGS] != NULL) {
4875                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4876                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4877                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4878                               NFT_SET_MAP | NFT_SET_EVAL |
4879                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4880                         return -EOPNOTSUPP;
4881                 /* Only one of these operations is supported */
4882                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4883                              (NFT_SET_MAP | NFT_SET_OBJECT))
4884                         return -EOPNOTSUPP;
4885                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4886                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4887                         return -EOPNOTSUPP;
4888         }
4889
4890         desc.dtype = 0;
4891         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4892                 if (!(flags & NFT_SET_MAP))
4893                         return -EINVAL;
4894
4895                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4896                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4897                     desc.dtype != NFT_DATA_VERDICT)
4898                         return -EINVAL;
4899
4900                 if (desc.dtype != NFT_DATA_VERDICT) {
4901                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4902                                 return -EINVAL;
4903                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4904                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4905                                 return -EINVAL;
4906                 } else
4907                         desc.dlen = sizeof(struct nft_verdict);
4908         } else if (flags & NFT_SET_MAP)
4909                 return -EINVAL;
4910
4911         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4912                 if (!(flags & NFT_SET_OBJECT))
4913                         return -EINVAL;
4914
4915                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4916                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4917                     desc.objtype > NFT_OBJECT_MAX)
4918                         return -EOPNOTSUPP;
4919         } else if (flags & NFT_SET_OBJECT)
4920                 return -EINVAL;
4921         else
4922                 desc.objtype = NFT_OBJECT_UNSPEC;
4923
4924         desc.timeout = 0;
4925         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4926                 if (!(flags & NFT_SET_TIMEOUT))
4927                         return -EINVAL;
4928
4929                 if (flags & NFT_SET_ANONYMOUS)
4930                         return -EOPNOTSUPP;
4931
4932                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4933                 if (err)
4934                         return err;
4935         }
4936         desc.gc_int = 0;
4937         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4938                 if (!(flags & NFT_SET_TIMEOUT))
4939                         return -EINVAL;
4940
4941                 if (flags & NFT_SET_ANONYMOUS)
4942                         return -EOPNOTSUPP;
4943
4944                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4945         }
4946
4947         desc.policy = NFT_SET_POL_PERFORMANCE;
4948         if (nla[NFTA_SET_POLICY] != NULL)
4949                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4950
4951         if (nla[NFTA_SET_DESC] != NULL) {
4952                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4953                 if (err < 0)
4954                         return err;
4955
4956                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4957                         return -EINVAL;
4958         } else if (flags & NFT_SET_CONCAT) {
4959                 return -EINVAL;
4960         }
4961
4962         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4963                 desc.expr = true;
4964
4965         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4966                                  NETLINK_CB(skb).portid);
4967         if (IS_ERR(table)) {
4968                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4969                 return PTR_ERR(table);
4970         }
4971
4972         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4973
4974         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4975         if (IS_ERR(set)) {
4976                 if (PTR_ERR(set) != -ENOENT) {
4977                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4978                         return PTR_ERR(set);
4979                 }
4980         } else {
4981                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4982
4983                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4984                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4985                         return -EEXIST;
4986                 }
4987                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4988                         return -EOPNOTSUPP;
4989
4990                 if (nft_set_is_anonymous(set))
4991                         return -EOPNOTSUPP;
4992
4993                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4994                 if (err < 0)
4995                         return err;
4996
4997                 err = 0;
4998                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4999                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5000                         err = -EEXIST;
5001                 }
5002
5003                 for (i = 0; i < num_exprs; i++)
5004                         nft_expr_destroy(&ctx, exprs[i]);
5005
5006                 if (err < 0)
5007                         return err;
5008
5009                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5010         }
5011
5012         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5013                 return -ENOENT;
5014
5015         ops = nft_select_set_ops(&ctx, nla, &desc);
5016         if (IS_ERR(ops))
5017                 return PTR_ERR(ops);
5018
5019         udlen = 0;
5020         if (nla[NFTA_SET_USERDATA])
5021                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5022
5023         size = 0;
5024         if (ops->privsize != NULL)
5025                 size = ops->privsize(nla, &desc);
5026         alloc_size = sizeof(*set) + size + udlen;
5027         if (alloc_size < size || alloc_size > INT_MAX)
5028                 return -ENOMEM;
5029
5030         if (!nft_use_inc(&table->use))
5031                 return -EMFILE;
5032
5033         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5034         if (!set) {
5035                 err = -ENOMEM;
5036                 goto err_alloc;
5037         }
5038
5039         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5040         if (!name) {
5041                 err = -ENOMEM;
5042                 goto err_set_name;
5043         }
5044
5045         err = nf_tables_set_alloc_name(&ctx, set, name);
5046         kfree(name);
5047         if (err < 0)
5048                 goto err_set_name;
5049
5050         udata = NULL;
5051         if (udlen) {
5052                 udata = set->data + size;
5053                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5054         }
5055
5056         INIT_LIST_HEAD(&set->bindings);
5057         INIT_LIST_HEAD(&set->catchall_list);
5058         set->table = table;
5059         write_pnet(&set->net, net);
5060         set->ops = ops;
5061         set->ktype = desc.ktype;
5062         set->klen = desc.klen;
5063         set->dtype = desc.dtype;
5064         set->objtype = desc.objtype;
5065         set->dlen = desc.dlen;
5066         set->flags = flags;
5067         set->size = desc.size;
5068         set->policy = desc.policy;
5069         set->udlen = udlen;
5070         set->udata = udata;
5071         set->timeout = desc.timeout;
5072         set->gc_int = desc.gc_int;
5073
5074         set->field_count = desc.field_count;
5075         for (i = 0; i < desc.field_count; i++)
5076                 set->field_len[i] = desc.field_len[i];
5077
5078         err = ops->init(set, &desc, nla);
5079         if (err < 0)
5080                 goto err_set_init;
5081
5082         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5083         if (err < 0)
5084                 goto err_set_destroy;
5085
5086         set->num_exprs = num_exprs;
5087         set->handle = nf_tables_alloc_handle(table);
5088         INIT_LIST_HEAD(&set->pending_update);
5089
5090         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5091         if (err < 0)
5092                 goto err_set_expr_alloc;
5093
5094         list_add_tail_rcu(&set->list, &table->sets);
5095
5096         return 0;
5097
5098 err_set_expr_alloc:
5099         for (i = 0; i < set->num_exprs; i++)
5100                 nft_expr_destroy(&ctx, set->exprs[i]);
5101 err_set_destroy:
5102         ops->destroy(&ctx, set);
5103 err_set_init:
5104         kfree(set->name);
5105 err_set_name:
5106         kvfree(set);
5107 err_alloc:
5108         nft_use_dec_restore(&table->use);
5109
5110         return err;
5111 }
5112
5113 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5114                                      struct nft_set *set)
5115 {
5116         struct nft_set_elem_catchall *next, *catchall;
5117
5118         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5119                 list_del_rcu(&catchall->list);
5120                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5121                 kfree_rcu(catchall, rcu);
5122         }
5123 }
5124
5125 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5126 {
5127         int i;
5128
5129         if (WARN_ON(set->use > 0))
5130                 return;
5131
5132         for (i = 0; i < set->num_exprs; i++)
5133                 nft_expr_destroy(ctx, set->exprs[i]);
5134
5135         set->ops->destroy(ctx, set);
5136         nft_set_catchall_destroy(ctx, set);
5137         kfree(set->name);
5138         kvfree(set);
5139 }
5140
5141 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5142                             const struct nlattr * const nla[])
5143 {
5144         struct netlink_ext_ack *extack = info->extack;
5145         u8 genmask = nft_genmask_next(info->net);
5146         u8 family = info->nfmsg->nfgen_family;
5147         struct net *net = info->net;
5148         const struct nlattr *attr;
5149         struct nft_table *table;
5150         struct nft_set *set;
5151         struct nft_ctx ctx;
5152
5153         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5154                 return -EAFNOSUPPORT;
5155
5156         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5157                                  genmask, NETLINK_CB(skb).portid);
5158         if (IS_ERR(table)) {
5159                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5160                 return PTR_ERR(table);
5161         }
5162
5163         if (nla[NFTA_SET_HANDLE]) {
5164                 attr = nla[NFTA_SET_HANDLE];
5165                 set = nft_set_lookup_byhandle(table, attr, genmask);
5166         } else {
5167                 attr = nla[NFTA_SET_NAME];
5168                 set = nft_set_lookup(table, attr, genmask);
5169         }
5170
5171         if (IS_ERR(set)) {
5172                 if (PTR_ERR(set) == -ENOENT &&
5173                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5174                         return 0;
5175
5176                 NL_SET_BAD_ATTR(extack, attr);
5177                 return PTR_ERR(set);
5178         }
5179         if (set->use ||
5180             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5181              atomic_read(&set->nelems) > 0)) {
5182                 NL_SET_BAD_ATTR(extack, attr);
5183                 return -EBUSY;
5184         }
5185
5186         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5187
5188         return nft_delset(&ctx, set);
5189 }
5190
5191 static int nft_validate_register_store(const struct nft_ctx *ctx,
5192                                        enum nft_registers reg,
5193                                        const struct nft_data *data,
5194                                        enum nft_data_types type,
5195                                        unsigned int len);
5196
5197 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5198                                      struct nft_set *set,
5199                                      struct nft_set_elem *elem)
5200 {
5201         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5202         enum nft_registers dreg;
5203
5204         dreg = nft_type_to_reg(set->dtype);
5205         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5206                                            set->dtype == NFT_DATA_VERDICT ?
5207                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5208                                            set->dlen);
5209 }
5210
5211 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5212                                         struct nft_set *set,
5213                                         const struct nft_set_iter *iter,
5214                                         struct nft_set_elem *elem)
5215 {
5216         return nft_setelem_data_validate(ctx, set, elem);
5217 }
5218
5219 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5220                                        struct nft_set *set)
5221 {
5222         u8 genmask = nft_genmask_next(ctx->net);
5223         struct nft_set_elem_catchall *catchall;
5224         struct nft_set_elem elem;
5225         struct nft_set_ext *ext;
5226         int ret = 0;
5227
5228         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5229                 ext = nft_set_elem_ext(set, catchall->elem);
5230                 if (!nft_set_elem_active(ext, genmask))
5231                         continue;
5232
5233                 elem.priv = catchall->elem;
5234                 ret = nft_setelem_data_validate(ctx, set, &elem);
5235                 if (ret < 0)
5236                         break;
5237         }
5238
5239         return ret;
5240 }
5241
5242 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5243                        struct nft_set_binding *binding)
5244 {
5245         struct nft_set_binding *i;
5246         struct nft_set_iter iter;
5247
5248         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5249                 return -EBUSY;
5250
5251         if (binding->flags & NFT_SET_MAP) {
5252                 /* If the set is already bound to the same chain all
5253                  * jumps are already validated for that chain.
5254                  */
5255                 list_for_each_entry(i, &set->bindings, list) {
5256                         if (i->flags & NFT_SET_MAP &&
5257                             i->chain == binding->chain)
5258                                 goto bind;
5259                 }
5260
5261                 iter.genmask    = nft_genmask_next(ctx->net);
5262                 iter.skip       = 0;
5263                 iter.count      = 0;
5264                 iter.err        = 0;
5265                 iter.fn         = nf_tables_bind_check_setelem;
5266
5267                 set->ops->walk(ctx, set, &iter);
5268                 if (!iter.err)
5269                         iter.err = nft_set_catchall_bind_check(ctx, set);
5270
5271                 if (iter.err < 0)
5272                         return iter.err;
5273         }
5274 bind:
5275         if (!nft_use_inc(&set->use))
5276                 return -EMFILE;
5277
5278         binding->chain = ctx->chain;
5279         list_add_tail_rcu(&binding->list, &set->bindings);
5280         nft_set_trans_bind(ctx, set);
5281
5282         return 0;
5283 }
5284 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5285
5286 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5287                                  struct nft_set_binding *binding, bool event)
5288 {
5289         list_del_rcu(&binding->list);
5290
5291         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5292                 list_del_rcu(&set->list);
5293                 if (event)
5294                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5295                                              GFP_KERNEL);
5296         }
5297 }
5298
5299 static void nft_setelem_data_activate(const struct net *net,
5300                                       const struct nft_set *set,
5301                                       struct nft_set_elem *elem);
5302
5303 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5304                                 struct nft_set *set,
5305                                 const struct nft_set_iter *iter,
5306                                 struct nft_set_elem *elem)
5307 {
5308         nft_setelem_data_activate(ctx->net, set, elem);
5309
5310         return 0;
5311 }
5312
5313 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5314                                       struct nft_set *set)
5315 {
5316         u8 genmask = nft_genmask_next(ctx->net);
5317         struct nft_set_elem_catchall *catchall;
5318         struct nft_set_elem elem;
5319         struct nft_set_ext *ext;
5320
5321         list_for_each_entry(catchall, &set->catchall_list, list) {
5322                 ext = nft_set_elem_ext(set, catchall->elem);
5323                 if (!nft_set_elem_active(ext, genmask))
5324                         continue;
5325
5326                 elem.priv = catchall->elem;
5327                 nft_setelem_data_activate(ctx->net, set, &elem);
5328                 break;
5329         }
5330 }
5331
5332 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5333 {
5334         struct nft_set_iter iter = {
5335                 .genmask        = nft_genmask_next(ctx->net),
5336                 .fn             = nft_mapelem_activate,
5337         };
5338
5339         set->ops->walk(ctx, set, &iter);
5340         WARN_ON_ONCE(iter.err);
5341
5342         nft_map_catchall_activate(ctx, set);
5343 }
5344
5345 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5346 {
5347         if (nft_set_is_anonymous(set)) {
5348                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5349                         nft_map_activate(ctx, set);
5350
5351                 nft_clear(ctx->net, set);
5352         }
5353
5354         nft_use_inc_restore(&set->use);
5355 }
5356 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5357
5358 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5359                               struct nft_set_binding *binding,
5360                               enum nft_trans_phase phase)
5361 {
5362         switch (phase) {
5363         case NFT_TRANS_PREPARE_ERROR:
5364                 nft_set_trans_unbind(ctx, set);
5365                 if (nft_set_is_anonymous(set))
5366                         nft_deactivate_next(ctx->net, set);
5367                 else
5368                         list_del_rcu(&binding->list);
5369
5370                 nft_use_dec(&set->use);
5371                 break;
5372         case NFT_TRANS_PREPARE:
5373                 if (nft_set_is_anonymous(set)) {
5374                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5375                                 nft_map_deactivate(ctx, set);
5376
5377                         nft_deactivate_next(ctx->net, set);
5378                 }
5379                 nft_use_dec(&set->use);
5380                 return;
5381         case NFT_TRANS_ABORT:
5382         case NFT_TRANS_RELEASE:
5383                 if (nft_set_is_anonymous(set) &&
5384                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5385                         nft_map_deactivate(ctx, set);
5386
5387                 nft_use_dec(&set->use);
5388                 fallthrough;
5389         default:
5390                 nf_tables_unbind_set(ctx, set, binding,
5391                                      phase == NFT_TRANS_COMMIT);
5392         }
5393 }
5394 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5395
5396 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5397 {
5398         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5399                 nft_set_destroy(ctx, set);
5400 }
5401 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5402
5403 const struct nft_set_ext_type nft_set_ext_types[] = {
5404         [NFT_SET_EXT_KEY]               = {
5405                 .align  = __alignof__(u32),
5406         },
5407         [NFT_SET_EXT_DATA]              = {
5408                 .align  = __alignof__(u32),
5409         },
5410         [NFT_SET_EXT_EXPRESSIONS]       = {
5411                 .align  = __alignof__(struct nft_set_elem_expr),
5412         },
5413         [NFT_SET_EXT_OBJREF]            = {
5414                 .len    = sizeof(struct nft_object *),
5415                 .align  = __alignof__(struct nft_object *),
5416         },
5417         [NFT_SET_EXT_FLAGS]             = {
5418                 .len    = sizeof(u8),
5419                 .align  = __alignof__(u8),
5420         },
5421         [NFT_SET_EXT_TIMEOUT]           = {
5422                 .len    = sizeof(u64),
5423                 .align  = __alignof__(u64),
5424         },
5425         [NFT_SET_EXT_EXPIRATION]        = {
5426                 .len    = sizeof(u64),
5427                 .align  = __alignof__(u64),
5428         },
5429         [NFT_SET_EXT_USERDATA]          = {
5430                 .len    = sizeof(struct nft_userdata),
5431                 .align  = __alignof__(struct nft_userdata),
5432         },
5433         [NFT_SET_EXT_KEY_END]           = {
5434                 .align  = __alignof__(u32),
5435         },
5436 };
5437
5438 /*
5439  * Set elements
5440  */
5441
5442 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5443         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5444         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5445         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5446         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5447         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5448         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5449                                             .len = NFT_USERDATA_MAXLEN },
5450         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5451         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5452                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5453         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5454         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5455 };
5456
5457 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5458         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5459                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5460         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5461                                             .len = NFT_SET_MAXNAMELEN - 1 },
5462         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5463         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5464 };
5465
5466 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5467                                   const struct nft_set *set,
5468                                   const struct nft_set_ext *ext,
5469                                   bool reset)
5470 {
5471         struct nft_set_elem_expr *elem_expr;
5472         u32 size, num_exprs = 0;
5473         struct nft_expr *expr;
5474         struct nlattr *nest;
5475
5476         elem_expr = nft_set_ext_expr(ext);
5477         nft_setelem_expr_foreach(expr, elem_expr, size)
5478                 num_exprs++;
5479
5480         if (num_exprs == 1) {
5481                 expr = nft_setelem_expr_at(elem_expr, 0);
5482                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5483                         return -1;
5484
5485                 return 0;
5486         } else if (num_exprs > 1) {
5487                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5488                 if (nest == NULL)
5489                         goto nla_put_failure;
5490
5491                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5492                         expr = nft_setelem_expr_at(elem_expr, size);
5493                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5494                                 goto nla_put_failure;
5495                 }
5496                 nla_nest_end(skb, nest);
5497         }
5498         return 0;
5499
5500 nla_put_failure:
5501         return -1;
5502 }
5503
5504 static int nf_tables_fill_setelem(struct sk_buff *skb,
5505                                   const struct nft_set *set,
5506                                   const struct nft_set_elem *elem,
5507                                   bool reset)
5508 {
5509         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5510         unsigned char *b = skb_tail_pointer(skb);
5511         struct nlattr *nest;
5512         u64 timeout = 0;
5513
5514         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5515         if (nest == NULL)
5516                 goto nla_put_failure;
5517
5518         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5519             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5520                           NFT_DATA_VALUE, set->klen) < 0)
5521                 goto nla_put_failure;
5522
5523         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5524             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5525                           NFT_DATA_VALUE, set->klen) < 0)
5526                 goto nla_put_failure;
5527
5528         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5529             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5530                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5531                           set->dlen) < 0)
5532                 goto nla_put_failure;
5533
5534         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5535             nft_set_elem_expr_dump(skb, set, ext, reset))
5536                 goto nla_put_failure;
5537
5538         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5539             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5540                            (*nft_set_ext_obj(ext))->key.name) < 0)
5541                 goto nla_put_failure;
5542
5543         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5544             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5545                          htonl(*nft_set_ext_flags(ext))))
5546                 goto nla_put_failure;
5547
5548         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) {
5549                 timeout = *nft_set_ext_timeout(ext);
5550                 if (nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5551                                  nf_jiffies64_to_msecs(timeout),
5552                                  NFTA_SET_ELEM_PAD))
5553                         goto nla_put_failure;
5554         } else if (set->flags & NFT_SET_TIMEOUT) {
5555                 timeout = READ_ONCE(set->timeout);
5556         }
5557
5558         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5559                 u64 expires, now = get_jiffies_64();
5560
5561                 expires = *nft_set_ext_expiration(ext);
5562                 if (time_before64(now, expires))
5563                         expires -= now;
5564                 else
5565                         expires = 0;
5566
5567                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5568                                  nf_jiffies64_to_msecs(expires),
5569                                  NFTA_SET_ELEM_PAD))
5570                         goto nla_put_failure;
5571
5572                 if (reset)
5573                         *nft_set_ext_expiration(ext) = now + timeout;
5574         }
5575
5576         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5577                 struct nft_userdata *udata;
5578
5579                 udata = nft_set_ext_userdata(ext);
5580                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5581                             udata->len + 1, udata->data))
5582                         goto nla_put_failure;
5583         }
5584
5585         nla_nest_end(skb, nest);
5586         return 0;
5587
5588 nla_put_failure:
5589         nlmsg_trim(skb, b);
5590         return -EMSGSIZE;
5591 }
5592
5593 struct nft_set_dump_args {
5594         const struct netlink_callback   *cb;
5595         struct nft_set_iter             iter;
5596         struct sk_buff                  *skb;
5597         bool                            reset;
5598 };
5599
5600 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5601                                   struct nft_set *set,
5602                                   const struct nft_set_iter *iter,
5603                                   struct nft_set_elem *elem)
5604 {
5605         struct nft_set_dump_args *args;
5606
5607         args = container_of(iter, struct nft_set_dump_args, iter);
5608         return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5609 }
5610
5611 struct nft_set_dump_ctx {
5612         const struct nft_set    *set;
5613         struct nft_ctx          ctx;
5614 };
5615
5616 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5617                                  const struct nft_set *set, bool reset)
5618 {
5619         struct nft_set_elem_catchall *catchall;
5620         u8 genmask = nft_genmask_cur(net);
5621         struct nft_set_elem elem;
5622         struct nft_set_ext *ext;
5623         int ret = 0;
5624
5625         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5626                 ext = nft_set_elem_ext(set, catchall->elem);
5627                 if (!nft_set_elem_active(ext, genmask) ||
5628                     nft_set_elem_expired(ext))
5629                         continue;
5630
5631                 elem.priv = catchall->elem;
5632                 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5633                 break;
5634         }
5635
5636         return ret;
5637 }
5638
5639 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5640 {
5641         struct nft_set_dump_ctx *dump_ctx = cb->data;
5642         struct net *net = sock_net(skb->sk);
5643         struct nftables_pernet *nft_net;
5644         struct nft_table *table;
5645         struct nft_set *set;
5646         struct nft_set_dump_args args;
5647         bool set_found = false;
5648         struct nlmsghdr *nlh;
5649         struct nlattr *nest;
5650         bool reset = false;
5651         u32 portid, seq;
5652         int event;
5653
5654         rcu_read_lock();
5655         nft_net = nft_pernet(net);
5656         cb->seq = READ_ONCE(nft_net->base_seq);
5657
5658         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5659                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5660                     dump_ctx->ctx.family != table->family)
5661                         continue;
5662
5663                 if (table != dump_ctx->ctx.table)
5664                         continue;
5665
5666                 list_for_each_entry_rcu(set, &table->sets, list) {
5667                         if (set == dump_ctx->set) {
5668                                 set_found = true;
5669                                 break;
5670                         }
5671                 }
5672                 break;
5673         }
5674
5675         if (!set_found) {
5676                 rcu_read_unlock();
5677                 return -ENOENT;
5678         }
5679
5680         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5681         portid = NETLINK_CB(cb->skb).portid;
5682         seq    = cb->nlh->nlmsg_seq;
5683
5684         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5685                            table->family, NFNETLINK_V0, nft_base_seq(net));
5686         if (!nlh)
5687                 goto nla_put_failure;
5688
5689         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5690                 goto nla_put_failure;
5691         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5692                 goto nla_put_failure;
5693
5694         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5695         if (nest == NULL)
5696                 goto nla_put_failure;
5697
5698         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5699                 reset = true;
5700
5701         args.cb                 = cb;
5702         args.skb                = skb;
5703         args.reset              = reset;
5704         args.iter.genmask       = nft_genmask_cur(net);
5705         args.iter.skip          = cb->args[0];
5706         args.iter.count         = 0;
5707         args.iter.err           = 0;
5708         args.iter.fn            = nf_tables_dump_setelem;
5709         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5710
5711         if (!args.iter.err && args.iter.count == cb->args[0])
5712                 args.iter.err = nft_set_catchall_dump(net, skb, set, reset);
5713         rcu_read_unlock();
5714
5715         nla_nest_end(skb, nest);
5716         nlmsg_end(skb, nlh);
5717
5718         if (args.iter.err && args.iter.err != -EMSGSIZE)
5719                 return args.iter.err;
5720         if (args.iter.count == cb->args[0])
5721                 return 0;
5722
5723         cb->args[0] = args.iter.count;
5724         return skb->len;
5725
5726 nla_put_failure:
5727         rcu_read_unlock();
5728         return -ENOSPC;
5729 }
5730
5731 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5732 {
5733         struct nft_set_dump_ctx *dump_ctx = cb->data;
5734
5735         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5736
5737         return cb->data ? 0 : -ENOMEM;
5738 }
5739
5740 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5741 {
5742         kfree(cb->data);
5743         return 0;
5744 }
5745
5746 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5747                                        const struct nft_ctx *ctx, u32 seq,
5748                                        u32 portid, int event, u16 flags,
5749                                        const struct nft_set *set,
5750                                        const struct nft_set_elem *elem,
5751                                        bool reset)
5752 {
5753         struct nlmsghdr *nlh;
5754         struct nlattr *nest;
5755         int err;
5756
5757         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5758         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5759                            NFNETLINK_V0, nft_base_seq(ctx->net));
5760         if (!nlh)
5761                 goto nla_put_failure;
5762
5763         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5764                 goto nla_put_failure;
5765         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5766                 goto nla_put_failure;
5767
5768         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5769         if (nest == NULL)
5770                 goto nla_put_failure;
5771
5772         err = nf_tables_fill_setelem(skb, set, elem, reset);
5773         if (err < 0)
5774                 goto nla_put_failure;
5775
5776         nla_nest_end(skb, nest);
5777
5778         nlmsg_end(skb, nlh);
5779         return 0;
5780
5781 nla_put_failure:
5782         nlmsg_trim(skb, nlh);
5783         return -1;
5784 }
5785
5786 static int nft_setelem_parse_flags(const struct nft_set *set,
5787                                    const struct nlattr *attr, u32 *flags)
5788 {
5789         if (attr == NULL)
5790                 return 0;
5791
5792         *flags = ntohl(nla_get_be32(attr));
5793         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5794                 return -EOPNOTSUPP;
5795         if (!(set->flags & NFT_SET_INTERVAL) &&
5796             *flags & NFT_SET_ELEM_INTERVAL_END)
5797                 return -EINVAL;
5798         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5799             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5800                 return -EINVAL;
5801
5802         return 0;
5803 }
5804
5805 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5806                                  struct nft_data *key, struct nlattr *attr)
5807 {
5808         struct nft_data_desc desc = {
5809                 .type   = NFT_DATA_VALUE,
5810                 .size   = NFT_DATA_VALUE_MAXLEN,
5811                 .len    = set->klen,
5812         };
5813
5814         return nft_data_init(ctx, key, &desc, attr);
5815 }
5816
5817 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5818                                   struct nft_data_desc *desc,
5819                                   struct nft_data *data,
5820                                   struct nlattr *attr)
5821 {
5822         u32 dtype;
5823
5824         if (set->dtype == NFT_DATA_VERDICT)
5825                 dtype = NFT_DATA_VERDICT;
5826         else
5827                 dtype = NFT_DATA_VALUE;
5828
5829         desc->type = dtype;
5830         desc->size = NFT_DATA_VALUE_MAXLEN;
5831         desc->len = set->dlen;
5832         desc->flags = NFT_DATA_DESC_SETELEM;
5833
5834         return nft_data_init(ctx, data, desc, attr);
5835 }
5836
5837 static void *nft_setelem_catchall_get(const struct net *net,
5838                                       const struct nft_set *set)
5839 {
5840         struct nft_set_elem_catchall *catchall;
5841         u8 genmask = nft_genmask_cur(net);
5842         struct nft_set_ext *ext;
5843         void *priv = NULL;
5844
5845         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5846                 ext = nft_set_elem_ext(set, catchall->elem);
5847                 if (!nft_set_elem_active(ext, genmask) ||
5848                     nft_set_elem_expired(ext))
5849                         continue;
5850
5851                 priv = catchall->elem;
5852                 break;
5853         }
5854
5855         return priv;
5856 }
5857
5858 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5859                            struct nft_set_elem *elem, u32 flags)
5860 {
5861         void *priv;
5862
5863         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5864                 priv = set->ops->get(ctx->net, set, elem, flags);
5865                 if (IS_ERR(priv))
5866                         return PTR_ERR(priv);
5867         } else {
5868                 priv = nft_setelem_catchall_get(ctx->net, set);
5869                 if (!priv)
5870                         return -ENOENT;
5871         }
5872         elem->priv = priv;
5873
5874         return 0;
5875 }
5876
5877 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5878                             const struct nlattr *attr, bool reset)
5879 {
5880         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5881         struct nft_set_elem elem;
5882         struct sk_buff *skb;
5883         uint32_t flags = 0;
5884         int err;
5885
5886         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5887                                           nft_set_elem_policy, NULL);
5888         if (err < 0)
5889                 return err;
5890
5891         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5892         if (err < 0)
5893                 return err;
5894
5895         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5896                 return -EINVAL;
5897
5898         if (nla[NFTA_SET_ELEM_KEY]) {
5899                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5900                                             nla[NFTA_SET_ELEM_KEY]);
5901                 if (err < 0)
5902                         return err;
5903         }
5904
5905         if (nla[NFTA_SET_ELEM_KEY_END]) {
5906                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5907                                             nla[NFTA_SET_ELEM_KEY_END]);
5908                 if (err < 0)
5909                         return err;
5910         }
5911
5912         err = nft_setelem_get(ctx, set, &elem, flags);
5913         if (err < 0)
5914                 return err;
5915
5916         err = -ENOMEM;
5917         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5918         if (skb == NULL)
5919                 return err;
5920
5921         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5922                                           NFT_MSG_NEWSETELEM, 0, set, &elem,
5923                                           reset);
5924         if (err < 0)
5925                 goto err_fill_setelem;
5926
5927         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5928
5929 err_fill_setelem:
5930         kfree_skb(skb);
5931         return err;
5932 }
5933
5934 /* called with rcu_read_lock held */
5935 static int nf_tables_getsetelem(struct sk_buff *skb,
5936                                 const struct nfnl_info *info,
5937                                 const struct nlattr * const nla[])
5938 {
5939         struct netlink_ext_ack *extack = info->extack;
5940         u8 genmask = nft_genmask_cur(info->net);
5941         u8 family = info->nfmsg->nfgen_family;
5942         struct net *net = info->net;
5943         struct nft_table *table;
5944         struct nft_set *set;
5945         struct nlattr *attr;
5946         struct nft_ctx ctx;
5947         bool reset = false;
5948         int rem, err = 0;
5949
5950         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5951                                  genmask, 0);
5952         if (IS_ERR(table)) {
5953                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5954                 return PTR_ERR(table);
5955         }
5956
5957         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5958         if (IS_ERR(set))
5959                 return PTR_ERR(set);
5960
5961         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5962
5963         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5964                 struct netlink_dump_control c = {
5965                         .start = nf_tables_dump_set_start,
5966                         .dump = nf_tables_dump_set,
5967                         .done = nf_tables_dump_set_done,
5968                         .module = THIS_MODULE,
5969                 };
5970                 struct nft_set_dump_ctx dump_ctx = {
5971                         .set = set,
5972                         .ctx = ctx,
5973                 };
5974
5975                 c.data = &dump_ctx;
5976                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5977         }
5978
5979         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5980                 return -EINVAL;
5981
5982         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5983                 reset = true;
5984
5985         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5986                 err = nft_get_set_elem(&ctx, set, attr, reset);
5987                 if (err < 0) {
5988                         NL_SET_BAD_ATTR(extack, attr);
5989                         break;
5990                 }
5991         }
5992
5993         return err;
5994 }
5995
5996 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5997                                      const struct nft_set *set,
5998                                      const struct nft_set_elem *elem,
5999                                      int event)
6000 {
6001         struct nftables_pernet *nft_net;
6002         struct net *net = ctx->net;
6003         u32 portid = ctx->portid;
6004         struct sk_buff *skb;
6005         u16 flags = 0;
6006         int err;
6007
6008         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6009                 return;
6010
6011         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6012         if (skb == NULL)
6013                 goto err;
6014
6015         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6016                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6017
6018         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6019                                           set, elem, false);
6020         if (err < 0) {
6021                 kfree_skb(skb);
6022                 goto err;
6023         }
6024
6025         nft_net = nft_pernet(net);
6026         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6027         return;
6028 err:
6029         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6030 }
6031
6032 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6033                                               int msg_type,
6034                                               struct nft_set *set)
6035 {
6036         struct nft_trans *trans;
6037
6038         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6039         if (trans == NULL)
6040                 return NULL;
6041
6042         nft_trans_elem_set(trans) = set;
6043         return trans;
6044 }
6045
6046 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6047                                          const struct nft_set *set,
6048                                          const struct nlattr *attr)
6049 {
6050         struct nft_expr *expr;
6051         int err;
6052
6053         expr = nft_expr_init(ctx, attr);
6054         if (IS_ERR(expr))
6055                 return expr;
6056
6057         err = -EOPNOTSUPP;
6058         if (expr->ops->type->flags & NFT_EXPR_GC) {
6059                 if (set->flags & NFT_SET_TIMEOUT)
6060                         goto err_set_elem_expr;
6061                 if (!set->ops->gc_init)
6062                         goto err_set_elem_expr;
6063                 set->ops->gc_init(set);
6064         }
6065
6066         return expr;
6067
6068 err_set_elem_expr:
6069         nft_expr_destroy(ctx, expr);
6070         return ERR_PTR(err);
6071 }
6072
6073 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6074 {
6075         len += nft_set_ext_types[id].len;
6076         if (len > tmpl->ext_len[id] ||
6077             len > U8_MAX)
6078                 return -1;
6079
6080         return 0;
6081 }
6082
6083 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6084                               void *to, const void *from, u32 len)
6085 {
6086         if (nft_set_ext_check(tmpl, id, len) < 0)
6087                 return -1;
6088
6089         memcpy(to, from, len);
6090
6091         return 0;
6092 }
6093
6094 void *nft_set_elem_init(const struct nft_set *set,
6095                         const struct nft_set_ext_tmpl *tmpl,
6096                         const u32 *key, const u32 *key_end,
6097                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6098 {
6099         struct nft_set_ext *ext;
6100         void *elem;
6101
6102         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6103         if (elem == NULL)
6104                 return ERR_PTR(-ENOMEM);
6105
6106         ext = nft_set_elem_ext(set, elem);
6107         nft_set_ext_init(ext, tmpl);
6108
6109         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6110             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6111                                nft_set_ext_key(ext), key, set->klen) < 0)
6112                 goto err_ext_check;
6113
6114         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6115             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6116                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6117                 goto err_ext_check;
6118
6119         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6120             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6121                                nft_set_ext_data(ext), data, set->dlen) < 0)
6122                 goto err_ext_check;
6123
6124         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6125                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6126                 if (expiration == 0)
6127                         *nft_set_ext_expiration(ext) += timeout;
6128         }
6129         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6130                 *nft_set_ext_timeout(ext) = timeout;
6131
6132         return elem;
6133
6134 err_ext_check:
6135         kfree(elem);
6136
6137         return ERR_PTR(-EINVAL);
6138 }
6139
6140 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6141                                         struct nft_expr *expr)
6142 {
6143         if (expr->ops->destroy_clone) {
6144                 expr->ops->destroy_clone(ctx, expr);
6145                 module_put(expr->ops->type->owner);
6146         } else {
6147                 nf_tables_expr_destroy(ctx, expr);
6148         }
6149 }
6150
6151 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6152                                       struct nft_set_elem_expr *elem_expr)
6153 {
6154         struct nft_expr *expr;
6155         u32 size;
6156
6157         nft_setelem_expr_foreach(expr, elem_expr, size)
6158                 __nft_set_elem_expr_destroy(ctx, expr);
6159 }
6160
6161 /* Drop references and destroy. Called from gc, dynset and abort path. */
6162 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6163                           bool destroy_expr)
6164 {
6165         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6166         struct nft_ctx ctx = {
6167                 .net    = read_pnet(&set->net),
6168                 .family = set->table->family,
6169         };
6170
6171         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6172         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6173                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6174         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6175                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6176
6177         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6178                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6179         kfree(elem);
6180 }
6181 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6182
6183 /* Destroy element. References have been already dropped in the preparation
6184  * path via nft_setelem_data_deactivate().
6185  */
6186 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6187                                 const struct nft_set *set, void *elem)
6188 {
6189         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6190
6191         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6192                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6193
6194         kfree(elem);
6195 }
6196
6197 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6198                             struct nft_expr *expr_array[])
6199 {
6200         struct nft_expr *expr;
6201         int err, i, k;
6202
6203         for (i = 0; i < set->num_exprs; i++) {
6204                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6205                 if (!expr)
6206                         goto err_expr;
6207
6208                 err = nft_expr_clone(expr, set->exprs[i]);
6209                 if (err < 0) {
6210                         kfree(expr);
6211                         goto err_expr;
6212                 }
6213                 expr_array[i] = expr;
6214         }
6215
6216         return 0;
6217
6218 err_expr:
6219         for (k = i - 1; k >= 0; k--)
6220                 nft_expr_destroy(ctx, expr_array[k]);
6221
6222         return -ENOMEM;
6223 }
6224
6225 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6226                                    const struct nft_set_ext_tmpl *tmpl,
6227                                    const struct nft_set_ext *ext,
6228                                    struct nft_expr *expr_array[],
6229                                    u32 num_exprs)
6230 {
6231         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6232         u32 len = sizeof(struct nft_set_elem_expr);
6233         struct nft_expr *expr;
6234         int i, err;
6235
6236         if (num_exprs == 0)
6237                 return 0;
6238
6239         for (i = 0; i < num_exprs; i++)
6240                 len += expr_array[i]->ops->size;
6241
6242         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6243                 return -EINVAL;
6244
6245         for (i = 0; i < num_exprs; i++) {
6246                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6247                 err = nft_expr_clone(expr, expr_array[i]);
6248                 if (err < 0)
6249                         goto err_elem_expr_setup;
6250
6251                 elem_expr->size += expr_array[i]->ops->size;
6252                 nft_expr_destroy(ctx, expr_array[i]);
6253                 expr_array[i] = NULL;
6254         }
6255
6256         return 0;
6257
6258 err_elem_expr_setup:
6259         for (; i < num_exprs; i++) {
6260                 nft_expr_destroy(ctx, expr_array[i]);
6261                 expr_array[i] = NULL;
6262         }
6263
6264         return -ENOMEM;
6265 }
6266
6267 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6268                                             const struct nft_set *set)
6269 {
6270         struct nft_set_elem_catchall *catchall;
6271         u8 genmask = nft_genmask_cur(net);
6272         struct nft_set_ext *ext;
6273
6274         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6275                 ext = nft_set_elem_ext(set, catchall->elem);
6276                 if (nft_set_elem_active(ext, genmask) &&
6277                     !nft_set_elem_expired(ext))
6278                         return ext;
6279         }
6280
6281         return NULL;
6282 }
6283 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6284
6285 void *nft_set_catchall_gc(const struct nft_set *set)
6286 {
6287         struct nft_set_elem_catchall *catchall, *next;
6288         struct nft_set_ext *ext;
6289         void *elem = NULL;
6290
6291         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6292                 ext = nft_set_elem_ext(set, catchall->elem);
6293
6294                 if (!nft_set_elem_expired(ext) ||
6295                     nft_set_elem_mark_busy(ext))
6296                         continue;
6297
6298                 elem = catchall->elem;
6299                 list_del_rcu(&catchall->list);
6300                 kfree_rcu(catchall, rcu);
6301                 break;
6302         }
6303
6304         return elem;
6305 }
6306 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
6307
6308 static int nft_setelem_catchall_insert(const struct net *net,
6309                                        struct nft_set *set,
6310                                        const struct nft_set_elem *elem,
6311                                        struct nft_set_ext **pext)
6312 {
6313         struct nft_set_elem_catchall *catchall;
6314         u8 genmask = nft_genmask_next(net);
6315         struct nft_set_ext *ext;
6316
6317         list_for_each_entry(catchall, &set->catchall_list, list) {
6318                 ext = nft_set_elem_ext(set, catchall->elem);
6319                 if (nft_set_elem_active(ext, genmask)) {
6320                         *pext = ext;
6321                         return -EEXIST;
6322                 }
6323         }
6324
6325         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6326         if (!catchall)
6327                 return -ENOMEM;
6328
6329         catchall->elem = elem->priv;
6330         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6331
6332         return 0;
6333 }
6334
6335 static int nft_setelem_insert(const struct net *net,
6336                               struct nft_set *set,
6337                               const struct nft_set_elem *elem,
6338                               struct nft_set_ext **ext, unsigned int flags)
6339 {
6340         int ret;
6341
6342         if (flags & NFT_SET_ELEM_CATCHALL)
6343                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6344         else
6345                 ret = set->ops->insert(net, set, elem, ext);
6346
6347         return ret;
6348 }
6349
6350 static bool nft_setelem_is_catchall(const struct nft_set *set,
6351                                     const struct nft_set_elem *elem)
6352 {
6353         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6354
6355         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6356             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6357                 return true;
6358
6359         return false;
6360 }
6361
6362 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6363                                  struct nft_set_elem *elem)
6364 {
6365         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6366
6367         if (nft_setelem_is_catchall(set, elem)) {
6368                 nft_set_elem_change_active(net, set, ext);
6369                 nft_set_elem_clear_busy(ext);
6370         } else {
6371                 set->ops->activate(net, set, elem);
6372         }
6373 }
6374
6375 static int nft_setelem_catchall_deactivate(const struct net *net,
6376                                            struct nft_set *set,
6377                                            struct nft_set_elem *elem)
6378 {
6379         struct nft_set_elem_catchall *catchall;
6380         struct nft_set_ext *ext;
6381
6382         list_for_each_entry(catchall, &set->catchall_list, list) {
6383                 ext = nft_set_elem_ext(set, catchall->elem);
6384                 if (!nft_is_active(net, ext) ||
6385                     nft_set_elem_mark_busy(ext))
6386                         continue;
6387
6388                 kfree(elem->priv);
6389                 elem->priv = catchall->elem;
6390                 nft_set_elem_change_active(net, set, ext);
6391                 return 0;
6392         }
6393
6394         return -ENOENT;
6395 }
6396
6397 static int __nft_setelem_deactivate(const struct net *net,
6398                                     struct nft_set *set,
6399                                     struct nft_set_elem *elem)
6400 {
6401         void *priv;
6402
6403         priv = set->ops->deactivate(net, set, elem);
6404         if (!priv)
6405                 return -ENOENT;
6406
6407         kfree(elem->priv);
6408         elem->priv = priv;
6409         set->ndeact++;
6410
6411         return 0;
6412 }
6413
6414 static int nft_setelem_deactivate(const struct net *net,
6415                                   struct nft_set *set,
6416                                   struct nft_set_elem *elem, u32 flags)
6417 {
6418         int ret;
6419
6420         if (flags & NFT_SET_ELEM_CATCHALL)
6421                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6422         else
6423                 ret = __nft_setelem_deactivate(net, set, elem);
6424
6425         return ret;
6426 }
6427
6428 static void nft_setelem_catchall_remove(const struct net *net,
6429                                         const struct nft_set *set,
6430                                         const struct nft_set_elem *elem)
6431 {
6432         struct nft_set_elem_catchall *catchall, *next;
6433
6434         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6435                 if (catchall->elem == elem->priv) {
6436                         list_del_rcu(&catchall->list);
6437                         kfree_rcu(catchall, rcu);
6438                         break;
6439                 }
6440         }
6441 }
6442
6443 static void nft_setelem_remove(const struct net *net,
6444                                const struct nft_set *set,
6445                                const struct nft_set_elem *elem)
6446 {
6447         if (nft_setelem_is_catchall(set, elem))
6448                 nft_setelem_catchall_remove(net, set, elem);
6449         else
6450                 set->ops->remove(net, set, elem);
6451 }
6452
6453 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6454                                       struct nlattr **nla, u32 flags)
6455 {
6456         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6457                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6458                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6459                         return false;
6460
6461                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6462                     flags & NFT_SET_ELEM_CATCHALL)
6463                         return false;
6464         } else {
6465                 if (nla[NFTA_SET_ELEM_KEY_END])
6466                         return false;
6467         }
6468
6469         return true;
6470 }
6471
6472 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6473                             const struct nlattr *attr, u32 nlmsg_flags)
6474 {
6475         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6476         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6477         u8 genmask = nft_genmask_next(ctx->net);
6478         u32 flags = 0, size = 0, num_exprs = 0;
6479         struct nft_set_ext_tmpl tmpl;
6480         struct nft_set_ext *ext, *ext2;
6481         struct nft_set_elem elem;
6482         struct nft_set_binding *binding;
6483         struct nft_object *obj = NULL;
6484         struct nft_userdata *udata;
6485         struct nft_data_desc desc;
6486         enum nft_registers dreg;
6487         struct nft_trans *trans;
6488         u64 timeout;
6489         u64 expiration;
6490         int err, i;
6491         u8 ulen;
6492
6493         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6494                                           nft_set_elem_policy, NULL);
6495         if (err < 0)
6496                 return err;
6497
6498         nft_set_ext_prepare(&tmpl);
6499
6500         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6501         if (err < 0)
6502                 return err;
6503
6504         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6505             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6506                 return -EINVAL;
6507
6508         if (flags != 0) {
6509                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6510                 if (err < 0)
6511                         return err;
6512         }
6513
6514         if (set->flags & NFT_SET_MAP) {
6515                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6516                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6517                         return -EINVAL;
6518         } else {
6519                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6520                         return -EINVAL;
6521         }
6522
6523         if (set->flags & NFT_SET_OBJECT) {
6524                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6525                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6526                         return -EINVAL;
6527         } else {
6528                 if (nla[NFTA_SET_ELEM_OBJREF])
6529                         return -EINVAL;
6530         }
6531
6532         if (!nft_setelem_valid_key_end(set, nla, flags))
6533                 return -EINVAL;
6534
6535         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6536              (nla[NFTA_SET_ELEM_DATA] ||
6537               nla[NFTA_SET_ELEM_OBJREF] ||
6538               nla[NFTA_SET_ELEM_TIMEOUT] ||
6539               nla[NFTA_SET_ELEM_EXPIRATION] ||
6540               nla[NFTA_SET_ELEM_USERDATA] ||
6541               nla[NFTA_SET_ELEM_EXPR] ||
6542               nla[NFTA_SET_ELEM_KEY_END] ||
6543               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6544                 return -EINVAL;
6545
6546         timeout = 0;
6547         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6548                 if (!(set->flags & NFT_SET_TIMEOUT))
6549                         return -EINVAL;
6550                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6551                                             &timeout);
6552                 if (err)
6553                         return err;
6554         } else if (set->flags & NFT_SET_TIMEOUT &&
6555                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6556                 timeout = READ_ONCE(set->timeout);
6557         }
6558
6559         expiration = 0;
6560         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6561                 if (!(set->flags & NFT_SET_TIMEOUT))
6562                         return -EINVAL;
6563                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6564                                             &expiration);
6565                 if (err)
6566                         return err;
6567         }
6568
6569         if (nla[NFTA_SET_ELEM_EXPR]) {
6570                 struct nft_expr *expr;
6571
6572                 if (set->num_exprs && set->num_exprs != 1)
6573                         return -EOPNOTSUPP;
6574
6575                 expr = nft_set_elem_expr_alloc(ctx, set,
6576                                                nla[NFTA_SET_ELEM_EXPR]);
6577                 if (IS_ERR(expr))
6578                         return PTR_ERR(expr);
6579
6580                 expr_array[0] = expr;
6581                 num_exprs = 1;
6582
6583                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6584                         err = -EOPNOTSUPP;
6585                         goto err_set_elem_expr;
6586                 }
6587         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6588                 struct nft_expr *expr;
6589                 struct nlattr *tmp;
6590                 int left;
6591
6592                 i = 0;
6593                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6594                         if (i == NFT_SET_EXPR_MAX ||
6595                             (set->num_exprs && set->num_exprs == i)) {
6596                                 err = -E2BIG;
6597                                 goto err_set_elem_expr;
6598                         }
6599                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6600                                 err = -EINVAL;
6601                                 goto err_set_elem_expr;
6602                         }
6603                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6604                         if (IS_ERR(expr)) {
6605                                 err = PTR_ERR(expr);
6606                                 goto err_set_elem_expr;
6607                         }
6608                         expr_array[i] = expr;
6609                         num_exprs++;
6610
6611                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6612                                 err = -EOPNOTSUPP;
6613                                 goto err_set_elem_expr;
6614                         }
6615                         i++;
6616                 }
6617                 if (set->num_exprs && set->num_exprs != i) {
6618                         err = -EOPNOTSUPP;
6619                         goto err_set_elem_expr;
6620                 }
6621         } else if (set->num_exprs > 0 &&
6622                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6623                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6624                 if (err < 0)
6625                         goto err_set_elem_expr_clone;
6626
6627                 num_exprs = set->num_exprs;
6628         }
6629
6630         if (nla[NFTA_SET_ELEM_KEY]) {
6631                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6632                                             nla[NFTA_SET_ELEM_KEY]);
6633                 if (err < 0)
6634                         goto err_set_elem_expr;
6635
6636                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6637                 if (err < 0)
6638                         goto err_parse_key;
6639         }
6640
6641         if (nla[NFTA_SET_ELEM_KEY_END]) {
6642                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6643                                             nla[NFTA_SET_ELEM_KEY_END]);
6644                 if (err < 0)
6645                         goto err_parse_key;
6646
6647                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6648                 if (err < 0)
6649                         goto err_parse_key_end;
6650         }
6651
6652         if (timeout > 0) {
6653                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6654                 if (err < 0)
6655                         goto err_parse_key_end;
6656
6657                 if (timeout != READ_ONCE(set->timeout)) {
6658                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6659                         if (err < 0)
6660                                 goto err_parse_key_end;
6661                 }
6662         }
6663
6664         if (num_exprs) {
6665                 for (i = 0; i < num_exprs; i++)
6666                         size += expr_array[i]->ops->size;
6667
6668                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6669                                              sizeof(struct nft_set_elem_expr) + size);
6670                 if (err < 0)
6671                         goto err_parse_key_end;
6672         }
6673
6674         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6675                 obj = nft_obj_lookup(ctx->net, ctx->table,
6676                                      nla[NFTA_SET_ELEM_OBJREF],
6677                                      set->objtype, genmask);
6678                 if (IS_ERR(obj)) {
6679                         err = PTR_ERR(obj);
6680                         obj = NULL;
6681                         goto err_parse_key_end;
6682                 }
6683
6684                 if (!nft_use_inc(&obj->use)) {
6685                         err = -EMFILE;
6686                         obj = NULL;
6687                         goto err_parse_key_end;
6688                 }
6689
6690                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6691                 if (err < 0)
6692                         goto err_parse_key_end;
6693         }
6694
6695         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6696                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6697                                              nla[NFTA_SET_ELEM_DATA]);
6698                 if (err < 0)
6699                         goto err_parse_key_end;
6700
6701                 dreg = nft_type_to_reg(set->dtype);
6702                 list_for_each_entry(binding, &set->bindings, list) {
6703                         struct nft_ctx bind_ctx = {
6704                                 .net    = ctx->net,
6705                                 .family = ctx->family,
6706                                 .table  = ctx->table,
6707                                 .chain  = (struct nft_chain *)binding->chain,
6708                         };
6709
6710                         if (!(binding->flags & NFT_SET_MAP))
6711                                 continue;
6712
6713                         err = nft_validate_register_store(&bind_ctx, dreg,
6714                                                           &elem.data.val,
6715                                                           desc.type, desc.len);
6716                         if (err < 0)
6717                                 goto err_parse_data;
6718
6719                         if (desc.type == NFT_DATA_VERDICT &&
6720                             (elem.data.val.verdict.code == NFT_GOTO ||
6721                              elem.data.val.verdict.code == NFT_JUMP))
6722                                 nft_validate_state_update(ctx->table,
6723                                                           NFT_VALIDATE_NEED);
6724                 }
6725
6726                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6727                 if (err < 0)
6728                         goto err_parse_data;
6729         }
6730
6731         /* The full maximum length of userdata can exceed the maximum
6732          * offset value (U8_MAX) for following extensions, therefor it
6733          * must be the last extension added.
6734          */
6735         ulen = 0;
6736         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6737                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6738                 if (ulen > 0) {
6739                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6740                                                      ulen);
6741                         if (err < 0)
6742                                 goto err_parse_data;
6743                 }
6744         }
6745
6746         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6747                                       elem.key_end.val.data, elem.data.val.data,
6748                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6749         if (IS_ERR(elem.priv)) {
6750                 err = PTR_ERR(elem.priv);
6751                 goto err_parse_data;
6752         }
6753
6754         ext = nft_set_elem_ext(set, elem.priv);
6755         if (flags)
6756                 *nft_set_ext_flags(ext) = flags;
6757
6758         if (obj)
6759                 *nft_set_ext_obj(ext) = obj;
6760
6761         if (ulen > 0) {
6762                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6763                         err = -EINVAL;
6764                         goto err_elem_free;
6765                 }
6766                 udata = nft_set_ext_userdata(ext);
6767                 udata->len = ulen - 1;
6768                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6769         }
6770         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6771         if (err < 0)
6772                 goto err_elem_free;
6773
6774         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6775         if (trans == NULL) {
6776                 err = -ENOMEM;
6777                 goto err_elem_free;
6778         }
6779
6780         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6781
6782         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6783         if (err) {
6784                 if (err == -EEXIST) {
6785                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6786                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6787                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6788                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6789                                 goto err_element_clash;
6790                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6791                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6792                              memcmp(nft_set_ext_data(ext),
6793                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6794                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6795                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6796                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6797                                 goto err_element_clash;
6798                         else if (!(nlmsg_flags & NLM_F_EXCL))
6799                                 err = 0;
6800                 } else if (err == -ENOTEMPTY) {
6801                         /* ENOTEMPTY reports overlapping between this element
6802                          * and an existing one.
6803                          */
6804                         err = -EEXIST;
6805                 }
6806                 goto err_element_clash;
6807         }
6808
6809         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6810                 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6811
6812                 if (!atomic_add_unless(&set->nelems, 1, max)) {
6813                         err = -ENFILE;
6814                         goto err_set_full;
6815                 }
6816         }
6817
6818         nft_trans_elem(trans) = elem;
6819         nft_trans_commit_list_add_tail(ctx->net, trans);
6820         return 0;
6821
6822 err_set_full:
6823         nft_setelem_remove(ctx->net, set, &elem);
6824 err_element_clash:
6825         kfree(trans);
6826 err_elem_free:
6827         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6828 err_parse_data:
6829         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6830                 nft_data_release(&elem.data.val, desc.type);
6831 err_parse_key_end:
6832         if (obj)
6833                 nft_use_dec_restore(&obj->use);
6834
6835         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6836 err_parse_key:
6837         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6838 err_set_elem_expr:
6839         for (i = 0; i < num_exprs && expr_array[i]; i++)
6840                 nft_expr_destroy(ctx, expr_array[i]);
6841 err_set_elem_expr_clone:
6842         return err;
6843 }
6844
6845 static int nf_tables_newsetelem(struct sk_buff *skb,
6846                                 const struct nfnl_info *info,
6847                                 const struct nlattr * const nla[])
6848 {
6849         struct netlink_ext_ack *extack = info->extack;
6850         u8 genmask = nft_genmask_next(info->net);
6851         u8 family = info->nfmsg->nfgen_family;
6852         struct net *net = info->net;
6853         const struct nlattr *attr;
6854         struct nft_table *table;
6855         struct nft_set *set;
6856         struct nft_ctx ctx;
6857         int rem, err;
6858
6859         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6860                 return -EINVAL;
6861
6862         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6863                                  genmask, NETLINK_CB(skb).portid);
6864         if (IS_ERR(table)) {
6865                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6866                 return PTR_ERR(table);
6867         }
6868
6869         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6870                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6871         if (IS_ERR(set))
6872                 return PTR_ERR(set);
6873
6874         if (!list_empty(&set->bindings) &&
6875             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6876                 return -EBUSY;
6877
6878         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6879
6880         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6881                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6882                 if (err < 0) {
6883                         NL_SET_BAD_ATTR(extack, attr);
6884                         return err;
6885                 }
6886         }
6887
6888         if (table->validate_state == NFT_VALIDATE_DO)
6889                 return nft_table_validate(net, table);
6890
6891         return 0;
6892 }
6893
6894 /**
6895  *      nft_data_hold - hold a nft_data item
6896  *
6897  *      @data: struct nft_data to release
6898  *      @type: type of data
6899  *
6900  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6901  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6902  *      NFT_GOTO verdicts. This function must be called on active data objects
6903  *      from the second phase of the commit protocol.
6904  */
6905 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6906 {
6907         struct nft_chain *chain;
6908
6909         if (type == NFT_DATA_VERDICT) {
6910                 switch (data->verdict.code) {
6911                 case NFT_JUMP:
6912                 case NFT_GOTO:
6913                         chain = data->verdict.chain;
6914                         nft_use_inc_restore(&chain->use);
6915                         break;
6916                 }
6917         }
6918 }
6919
6920 static void nft_setelem_data_activate(const struct net *net,
6921                                       const struct nft_set *set,
6922                                       struct nft_set_elem *elem)
6923 {
6924         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6925
6926         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6927                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6928         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6929                 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
6930 }
6931
6932 static void nft_setelem_data_deactivate(const struct net *net,
6933                                         const struct nft_set *set,
6934                                         struct nft_set_elem *elem)
6935 {
6936         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6937
6938         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6939                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6940         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6941                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6942 }
6943
6944 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6945                            const struct nlattr *attr)
6946 {
6947         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6948         struct nft_set_ext_tmpl tmpl;
6949         struct nft_set_elem elem;
6950         struct nft_set_ext *ext;
6951         struct nft_trans *trans;
6952         u32 flags = 0;
6953         int err;
6954
6955         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6956                                           nft_set_elem_policy, NULL);
6957         if (err < 0)
6958                 return err;
6959
6960         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6961         if (err < 0)
6962                 return err;
6963
6964         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6965                 return -EINVAL;
6966
6967         if (!nft_setelem_valid_key_end(set, nla, flags))
6968                 return -EINVAL;
6969
6970         nft_set_ext_prepare(&tmpl);
6971
6972         if (flags != 0) {
6973                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6974                 if (err < 0)
6975                         return err;
6976         }
6977
6978         if (nla[NFTA_SET_ELEM_KEY]) {
6979                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6980                                             nla[NFTA_SET_ELEM_KEY]);
6981                 if (err < 0)
6982                         return err;
6983
6984                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6985                 if (err < 0)
6986                         goto fail_elem;
6987         }
6988
6989         if (nla[NFTA_SET_ELEM_KEY_END]) {
6990                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6991                                             nla[NFTA_SET_ELEM_KEY_END]);
6992                 if (err < 0)
6993                         goto fail_elem;
6994
6995                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6996                 if (err < 0)
6997                         goto fail_elem_key_end;
6998         }
6999
7000         err = -ENOMEM;
7001         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7002                                       elem.key_end.val.data, NULL, 0, 0,
7003                                       GFP_KERNEL_ACCOUNT);
7004         if (IS_ERR(elem.priv)) {
7005                 err = PTR_ERR(elem.priv);
7006                 goto fail_elem_key_end;
7007         }
7008
7009         ext = nft_set_elem_ext(set, elem.priv);
7010         if (flags)
7011                 *nft_set_ext_flags(ext) = flags;
7012
7013         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7014         if (trans == NULL)
7015                 goto fail_trans;
7016
7017         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7018         if (err < 0)
7019                 goto fail_ops;
7020
7021         nft_setelem_data_deactivate(ctx->net, set, &elem);
7022
7023         nft_trans_elem(trans) = elem;
7024         nft_trans_commit_list_add_tail(ctx->net, trans);
7025         return 0;
7026
7027 fail_ops:
7028         kfree(trans);
7029 fail_trans:
7030         kfree(elem.priv);
7031 fail_elem_key_end:
7032         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7033 fail_elem:
7034         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7035         return err;
7036 }
7037
7038 static int nft_setelem_flush(const struct nft_ctx *ctx,
7039                              struct nft_set *set,
7040                              const struct nft_set_iter *iter,
7041                              struct nft_set_elem *elem)
7042 {
7043         struct nft_trans *trans;
7044         int err;
7045
7046         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7047                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
7048         if (!trans)
7049                 return -ENOMEM;
7050
7051         if (!set->ops->flush(ctx->net, set, elem->priv)) {
7052                 err = -ENOENT;
7053                 goto err1;
7054         }
7055         set->ndeact++;
7056
7057         nft_setelem_data_deactivate(ctx->net, set, elem);
7058         nft_trans_elem_set(trans) = set;
7059         nft_trans_elem(trans) = *elem;
7060         nft_trans_commit_list_add_tail(ctx->net, trans);
7061
7062         return 0;
7063 err1:
7064         kfree(trans);
7065         return err;
7066 }
7067
7068 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7069                                     struct nft_set *set,
7070                                     struct nft_set_elem *elem)
7071 {
7072         struct nft_trans *trans;
7073
7074         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7075                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
7076         if (!trans)
7077                 return -ENOMEM;
7078
7079         nft_setelem_data_deactivate(ctx->net, set, elem);
7080         nft_trans_elem_set(trans) = set;
7081         nft_trans_elem(trans) = *elem;
7082         nft_trans_commit_list_add_tail(ctx->net, trans);
7083
7084         return 0;
7085 }
7086
7087 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7088                                   struct nft_set *set)
7089 {
7090         u8 genmask = nft_genmask_next(ctx->net);
7091         struct nft_set_elem_catchall *catchall;
7092         struct nft_set_elem elem;
7093         struct nft_set_ext *ext;
7094         int ret = 0;
7095
7096         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7097                 ext = nft_set_elem_ext(set, catchall->elem);
7098                 if (!nft_set_elem_active(ext, genmask) ||
7099                     nft_set_elem_mark_busy(ext))
7100                         continue;
7101
7102                 elem.priv = catchall->elem;
7103                 ret = __nft_set_catchall_flush(ctx, set, &elem);
7104                 if (ret < 0)
7105                         break;
7106         }
7107
7108         return ret;
7109 }
7110
7111 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7112 {
7113         struct nft_set_iter iter = {
7114                 .genmask        = genmask,
7115                 .fn             = nft_setelem_flush,
7116         };
7117
7118         set->ops->walk(ctx, set, &iter);
7119         if (!iter.err)
7120                 iter.err = nft_set_catchall_flush(ctx, set);
7121
7122         return iter.err;
7123 }
7124
7125 static int nf_tables_delsetelem(struct sk_buff *skb,
7126                                 const struct nfnl_info *info,
7127                                 const struct nlattr * const nla[])
7128 {
7129         struct netlink_ext_ack *extack = info->extack;
7130         u8 genmask = nft_genmask_next(info->net);
7131         u8 family = info->nfmsg->nfgen_family;
7132         struct net *net = info->net;
7133         const struct nlattr *attr;
7134         struct nft_table *table;
7135         struct nft_set *set;
7136         struct nft_ctx ctx;
7137         int rem, err = 0;
7138
7139         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7140                                  genmask, NETLINK_CB(skb).portid);
7141         if (IS_ERR(table)) {
7142                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7143                 return PTR_ERR(table);
7144         }
7145
7146         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7147         if (IS_ERR(set))
7148                 return PTR_ERR(set);
7149
7150         if (!list_empty(&set->bindings) &&
7151             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7152                 return -EBUSY;
7153
7154         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7155
7156         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7157                 return nft_set_flush(&ctx, set, genmask);
7158
7159         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7160                 err = nft_del_setelem(&ctx, set, attr);
7161                 if (err == -ENOENT &&
7162                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7163                         continue;
7164
7165                 if (err < 0) {
7166                         NL_SET_BAD_ATTR(extack, attr);
7167                         break;
7168                 }
7169         }
7170         return err;
7171 }
7172
7173 void nft_set_gc_batch_release(struct rcu_head *rcu)
7174 {
7175         struct nft_set_gc_batch *gcb;
7176         unsigned int i;
7177
7178         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
7179         for (i = 0; i < gcb->head.cnt; i++)
7180                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
7181         kfree(gcb);
7182 }
7183
7184 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
7185                                                 gfp_t gfp)
7186 {
7187         struct nft_set_gc_batch *gcb;
7188
7189         gcb = kzalloc(sizeof(*gcb), gfp);
7190         if (gcb == NULL)
7191                 return gcb;
7192         gcb->head.set = set;
7193         return gcb;
7194 }
7195
7196 /*
7197  * Stateful objects
7198  */
7199
7200 /**
7201  *      nft_register_obj- register nf_tables stateful object type
7202  *      @obj_type: object type
7203  *
7204  *      Registers the object type for use with nf_tables. Returns zero on
7205  *      success or a negative errno code otherwise.
7206  */
7207 int nft_register_obj(struct nft_object_type *obj_type)
7208 {
7209         if (obj_type->type == NFT_OBJECT_UNSPEC)
7210                 return -EINVAL;
7211
7212         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7213         list_add_rcu(&obj_type->list, &nf_tables_objects);
7214         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7215         return 0;
7216 }
7217 EXPORT_SYMBOL_GPL(nft_register_obj);
7218
7219 /**
7220  *      nft_unregister_obj - unregister nf_tables object type
7221  *      @obj_type: object type
7222  *
7223  *      Unregisters the object type for use with nf_tables.
7224  */
7225 void nft_unregister_obj(struct nft_object_type *obj_type)
7226 {
7227         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7228         list_del_rcu(&obj_type->list);
7229         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7230 }
7231 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7232
7233 struct nft_object *nft_obj_lookup(const struct net *net,
7234                                   const struct nft_table *table,
7235                                   const struct nlattr *nla, u32 objtype,
7236                                   u8 genmask)
7237 {
7238         struct nft_object_hash_key k = { .table = table };
7239         char search[NFT_OBJ_MAXNAMELEN];
7240         struct rhlist_head *tmp, *list;
7241         struct nft_object *obj;
7242
7243         nla_strscpy(search, nla, sizeof(search));
7244         k.name = search;
7245
7246         WARN_ON_ONCE(!rcu_read_lock_held() &&
7247                      !lockdep_commit_lock_is_held(net));
7248
7249         rcu_read_lock();
7250         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7251         if (!list)
7252                 goto out;
7253
7254         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7255                 if (objtype == obj->ops->type->type &&
7256                     nft_active_genmask(obj, genmask)) {
7257                         rcu_read_unlock();
7258                         return obj;
7259                 }
7260         }
7261 out:
7262         rcu_read_unlock();
7263         return ERR_PTR(-ENOENT);
7264 }
7265 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7266
7267 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7268                                                   const struct nlattr *nla,
7269                                                   u32 objtype, u8 genmask)
7270 {
7271         struct nft_object *obj;
7272
7273         list_for_each_entry(obj, &table->objects, list) {
7274                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7275                     objtype == obj->ops->type->type &&
7276                     nft_active_genmask(obj, genmask))
7277                         return obj;
7278         }
7279         return ERR_PTR(-ENOENT);
7280 }
7281
7282 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7283         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7284                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7285         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7286                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7287         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7288         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7289         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7290         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7291                                     .len = NFT_USERDATA_MAXLEN },
7292 };
7293
7294 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7295                                        const struct nft_object_type *type,
7296                                        const struct nlattr *attr)
7297 {
7298         struct nlattr **tb;
7299         const struct nft_object_ops *ops;
7300         struct nft_object *obj;
7301         int err = -ENOMEM;
7302
7303         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7304         if (!tb)
7305                 goto err1;
7306
7307         if (attr) {
7308                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7309                                                   type->policy, NULL);
7310                 if (err < 0)
7311                         goto err2;
7312         } else {
7313                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7314         }
7315
7316         if (type->select_ops) {
7317                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7318                 if (IS_ERR(ops)) {
7319                         err = PTR_ERR(ops);
7320                         goto err2;
7321                 }
7322         } else {
7323                 ops = type->ops;
7324         }
7325
7326         err = -ENOMEM;
7327         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7328         if (!obj)
7329                 goto err2;
7330
7331         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7332         if (err < 0)
7333                 goto err3;
7334
7335         obj->ops = ops;
7336
7337         kfree(tb);
7338         return obj;
7339 err3:
7340         kfree(obj);
7341 err2:
7342         kfree(tb);
7343 err1:
7344         return ERR_PTR(err);
7345 }
7346
7347 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7348                            struct nft_object *obj, bool reset)
7349 {
7350         struct nlattr *nest;
7351
7352         nest = nla_nest_start_noflag(skb, attr);
7353         if (!nest)
7354                 goto nla_put_failure;
7355         if (obj->ops->dump(skb, obj, reset) < 0)
7356                 goto nla_put_failure;
7357         nla_nest_end(skb, nest);
7358         return 0;
7359
7360 nla_put_failure:
7361         return -1;
7362 }
7363
7364 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7365 {
7366         const struct nft_object_type *type;
7367
7368         list_for_each_entry(type, &nf_tables_objects, list) {
7369                 if (objtype == type->type)
7370                         return type;
7371         }
7372         return NULL;
7373 }
7374
7375 static const struct nft_object_type *
7376 nft_obj_type_get(struct net *net, u32 objtype)
7377 {
7378         const struct nft_object_type *type;
7379
7380         type = __nft_obj_type_get(objtype);
7381         if (type != NULL && try_module_get(type->owner))
7382                 return type;
7383
7384         lockdep_nfnl_nft_mutex_not_held();
7385 #ifdef CONFIG_MODULES
7386         if (type == NULL) {
7387                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7388                         return ERR_PTR(-EAGAIN);
7389         }
7390 #endif
7391         return ERR_PTR(-ENOENT);
7392 }
7393
7394 static int nf_tables_updobj(const struct nft_ctx *ctx,
7395                             const struct nft_object_type *type,
7396                             const struct nlattr *attr,
7397                             struct nft_object *obj)
7398 {
7399         struct nft_object *newobj;
7400         struct nft_trans *trans;
7401         int err = -ENOMEM;
7402
7403         if (!try_module_get(type->owner))
7404                 return -ENOENT;
7405
7406         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7407                                 sizeof(struct nft_trans_obj));
7408         if (!trans)
7409                 goto err_trans;
7410
7411         newobj = nft_obj_init(ctx, type, attr);
7412         if (IS_ERR(newobj)) {
7413                 err = PTR_ERR(newobj);
7414                 goto err_free_trans;
7415         }
7416
7417         nft_trans_obj(trans) = obj;
7418         nft_trans_obj_update(trans) = true;
7419         nft_trans_obj_newobj(trans) = newobj;
7420         nft_trans_commit_list_add_tail(ctx->net, trans);
7421
7422         return 0;
7423
7424 err_free_trans:
7425         kfree(trans);
7426 err_trans:
7427         module_put(type->owner);
7428         return err;
7429 }
7430
7431 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7432                             const struct nlattr * const nla[])
7433 {
7434         struct netlink_ext_ack *extack = info->extack;
7435         u8 genmask = nft_genmask_next(info->net);
7436         u8 family = info->nfmsg->nfgen_family;
7437         const struct nft_object_type *type;
7438         struct net *net = info->net;
7439         struct nft_table *table;
7440         struct nft_object *obj;
7441         struct nft_ctx ctx;
7442         u32 objtype;
7443         int err;
7444
7445         if (!nla[NFTA_OBJ_TYPE] ||
7446             !nla[NFTA_OBJ_NAME] ||
7447             !nla[NFTA_OBJ_DATA])
7448                 return -EINVAL;
7449
7450         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7451                                  NETLINK_CB(skb).portid);
7452         if (IS_ERR(table)) {
7453                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7454                 return PTR_ERR(table);
7455         }
7456
7457         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7458         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7459         if (IS_ERR(obj)) {
7460                 err = PTR_ERR(obj);
7461                 if (err != -ENOENT) {
7462                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7463                         return err;
7464                 }
7465         } else {
7466                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7467                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7468                         return -EEXIST;
7469                 }
7470                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7471                         return -EOPNOTSUPP;
7472
7473                 type = __nft_obj_type_get(objtype);
7474                 if (WARN_ON_ONCE(!type))
7475                         return -ENOENT;
7476
7477                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7478
7479                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7480         }
7481
7482         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7483
7484         if (!nft_use_inc(&table->use))
7485                 return -EMFILE;
7486
7487         type = nft_obj_type_get(net, objtype);
7488         if (IS_ERR(type)) {
7489                 err = PTR_ERR(type);
7490                 goto err_type;
7491         }
7492
7493         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7494         if (IS_ERR(obj)) {
7495                 err = PTR_ERR(obj);
7496                 goto err_init;
7497         }
7498         obj->key.table = table;
7499         obj->handle = nf_tables_alloc_handle(table);
7500
7501         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7502         if (!obj->key.name) {
7503                 err = -ENOMEM;
7504                 goto err_strdup;
7505         }
7506
7507         if (nla[NFTA_OBJ_USERDATA]) {
7508                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7509                 if (obj->udata == NULL)
7510                         goto err_userdata;
7511
7512                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7513         }
7514
7515         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7516         if (err < 0)
7517                 goto err_trans;
7518
7519         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7520                               nft_objname_ht_params);
7521         if (err < 0)
7522                 goto err_obj_ht;
7523
7524         list_add_tail_rcu(&obj->list, &table->objects);
7525
7526         return 0;
7527 err_obj_ht:
7528         /* queued in transaction log */
7529         INIT_LIST_HEAD(&obj->list);
7530         return err;
7531 err_trans:
7532         kfree(obj->udata);
7533 err_userdata:
7534         kfree(obj->key.name);
7535 err_strdup:
7536         if (obj->ops->destroy)
7537                 obj->ops->destroy(&ctx, obj);
7538         kfree(obj);
7539 err_init:
7540         module_put(type->owner);
7541 err_type:
7542         nft_use_dec_restore(&table->use);
7543
7544         return err;
7545 }
7546
7547 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7548                                    u32 portid, u32 seq, int event, u32 flags,
7549                                    int family, const struct nft_table *table,
7550                                    struct nft_object *obj, bool reset)
7551 {
7552         struct nlmsghdr *nlh;
7553
7554         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7555         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7556                            NFNETLINK_V0, nft_base_seq(net));
7557         if (!nlh)
7558                 goto nla_put_failure;
7559
7560         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7561             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7562             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7563                          NFTA_OBJ_PAD))
7564                 goto nla_put_failure;
7565
7566         if (event == NFT_MSG_DELOBJ) {
7567                 nlmsg_end(skb, nlh);
7568                 return 0;
7569         }
7570
7571         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7572             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7573             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7574                 goto nla_put_failure;
7575
7576         if (obj->udata &&
7577             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7578                 goto nla_put_failure;
7579
7580         nlmsg_end(skb, nlh);
7581         return 0;
7582
7583 nla_put_failure:
7584         nlmsg_trim(skb, nlh);
7585         return -1;
7586 }
7587
7588 struct nft_obj_filter {
7589         char            *table;
7590         u32             type;
7591 };
7592
7593 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7594 {
7595         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7596         const struct nft_table *table;
7597         unsigned int idx = 0, s_idx = cb->args[0];
7598         struct nft_obj_filter *filter = cb->data;
7599         struct net *net = sock_net(skb->sk);
7600         int family = nfmsg->nfgen_family;
7601         struct nftables_pernet *nft_net;
7602         struct nft_object *obj;
7603         bool reset = false;
7604
7605         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7606                 reset = true;
7607
7608         rcu_read_lock();
7609         nft_net = nft_pernet(net);
7610         cb->seq = READ_ONCE(nft_net->base_seq);
7611
7612         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7613                 if (family != NFPROTO_UNSPEC && family != table->family)
7614                         continue;
7615
7616                 list_for_each_entry_rcu(obj, &table->objects, list) {
7617                         if (!nft_is_active(net, obj))
7618                                 goto cont;
7619                         if (idx < s_idx)
7620                                 goto cont;
7621                         if (idx > s_idx)
7622                                 memset(&cb->args[1], 0,
7623                                        sizeof(cb->args) - sizeof(cb->args[0]));
7624                         if (filter && filter->table &&
7625                             strcmp(filter->table, table->name))
7626                                 goto cont;
7627                         if (filter &&
7628                             filter->type != NFT_OBJECT_UNSPEC &&
7629                             obj->ops->type->type != filter->type)
7630                                 goto cont;
7631                         if (reset) {
7632                                 char *buf = kasprintf(GFP_ATOMIC,
7633                                                       "%s:%u",
7634                                                       table->name,
7635                                                       nft_net->base_seq);
7636
7637                                 audit_log_nfcfg(buf,
7638                                                 family,
7639                                                 obj->handle,
7640                                                 AUDIT_NFT_OP_OBJ_RESET,
7641                                                 GFP_ATOMIC);
7642                                 kfree(buf);
7643                         }
7644
7645                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7646                                                     cb->nlh->nlmsg_seq,
7647                                                     NFT_MSG_NEWOBJ,
7648                                                     NLM_F_MULTI | NLM_F_APPEND,
7649                                                     table->family, table,
7650                                                     obj, reset) < 0)
7651                                 goto done;
7652
7653                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7654 cont:
7655                         idx++;
7656                 }
7657         }
7658 done:
7659         rcu_read_unlock();
7660
7661         cb->args[0] = idx;
7662         return skb->len;
7663 }
7664
7665 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7666 {
7667         const struct nlattr * const *nla = cb->data;
7668         struct nft_obj_filter *filter = NULL;
7669
7670         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7671                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7672                 if (!filter)
7673                         return -ENOMEM;
7674
7675                 if (nla[NFTA_OBJ_TABLE]) {
7676                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7677                         if (!filter->table) {
7678                                 kfree(filter);
7679                                 return -ENOMEM;
7680                         }
7681                 }
7682
7683                 if (nla[NFTA_OBJ_TYPE])
7684                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7685         }
7686
7687         cb->data = filter;
7688         return 0;
7689 }
7690
7691 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7692 {
7693         struct nft_obj_filter *filter = cb->data;
7694
7695         if (filter) {
7696                 kfree(filter->table);
7697                 kfree(filter);
7698         }
7699
7700         return 0;
7701 }
7702
7703 /* called with rcu_read_lock held */
7704 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7705                             const struct nlattr * const nla[])
7706 {
7707         struct netlink_ext_ack *extack = info->extack;
7708         u8 genmask = nft_genmask_cur(info->net);
7709         u8 family = info->nfmsg->nfgen_family;
7710         const struct nft_table *table;
7711         struct net *net = info->net;
7712         struct nft_object *obj;
7713         struct sk_buff *skb2;
7714         bool reset = false;
7715         u32 objtype;
7716         int err;
7717
7718         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7719                 struct netlink_dump_control c = {
7720                         .start = nf_tables_dump_obj_start,
7721                         .dump = nf_tables_dump_obj,
7722                         .done = nf_tables_dump_obj_done,
7723                         .module = THIS_MODULE,
7724                         .data = (void *)nla,
7725                 };
7726
7727                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7728         }
7729
7730         if (!nla[NFTA_OBJ_NAME] ||
7731             !nla[NFTA_OBJ_TYPE])
7732                 return -EINVAL;
7733
7734         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7735         if (IS_ERR(table)) {
7736                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7737                 return PTR_ERR(table);
7738         }
7739
7740         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7741         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7742         if (IS_ERR(obj)) {
7743                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7744                 return PTR_ERR(obj);
7745         }
7746
7747         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7748         if (!skb2)
7749                 return -ENOMEM;
7750
7751         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7752                 reset = true;
7753
7754         if (reset) {
7755                 const struct nftables_pernet *nft_net;
7756                 char *buf;
7757
7758                 nft_net = nft_pernet(net);
7759                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7760
7761                 audit_log_nfcfg(buf,
7762                                 family,
7763                                 obj->handle,
7764                                 AUDIT_NFT_OP_OBJ_RESET,
7765                                 GFP_ATOMIC);
7766                 kfree(buf);
7767         }
7768
7769         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7770                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7771                                       family, table, obj, reset);
7772         if (err < 0)
7773                 goto err_fill_obj_info;
7774
7775         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7776
7777 err_fill_obj_info:
7778         kfree_skb(skb2);
7779         return err;
7780 }
7781
7782 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7783 {
7784         if (obj->ops->destroy)
7785                 obj->ops->destroy(ctx, obj);
7786
7787         module_put(obj->ops->type->owner);
7788         kfree(obj->key.name);
7789         kfree(obj->udata);
7790         kfree(obj);
7791 }
7792
7793 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7794                             const struct nlattr * const nla[])
7795 {
7796         struct netlink_ext_ack *extack = info->extack;
7797         u8 genmask = nft_genmask_next(info->net);
7798         u8 family = info->nfmsg->nfgen_family;
7799         struct net *net = info->net;
7800         const struct nlattr *attr;
7801         struct nft_table *table;
7802         struct nft_object *obj;
7803         struct nft_ctx ctx;
7804         u32 objtype;
7805
7806         if (!nla[NFTA_OBJ_TYPE] ||
7807             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7808                 return -EINVAL;
7809
7810         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7811                                  NETLINK_CB(skb).portid);
7812         if (IS_ERR(table)) {
7813                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7814                 return PTR_ERR(table);
7815         }
7816
7817         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7818         if (nla[NFTA_OBJ_HANDLE]) {
7819                 attr = nla[NFTA_OBJ_HANDLE];
7820                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7821         } else {
7822                 attr = nla[NFTA_OBJ_NAME];
7823                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7824         }
7825
7826         if (IS_ERR(obj)) {
7827                 if (PTR_ERR(obj) == -ENOENT &&
7828                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7829                         return 0;
7830
7831                 NL_SET_BAD_ATTR(extack, attr);
7832                 return PTR_ERR(obj);
7833         }
7834         if (obj->use > 0) {
7835                 NL_SET_BAD_ATTR(extack, attr);
7836                 return -EBUSY;
7837         }
7838
7839         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7840
7841         return nft_delobj(&ctx, obj);
7842 }
7843
7844 void nft_obj_notify(struct net *net, const struct nft_table *table,
7845                     struct nft_object *obj, u32 portid, u32 seq, int event,
7846                     u16 flags, int family, int report, gfp_t gfp)
7847 {
7848         struct nftables_pernet *nft_net = nft_pernet(net);
7849         struct sk_buff *skb;
7850         int err;
7851         char *buf = kasprintf(gfp, "%s:%u",
7852                               table->name, nft_net->base_seq);
7853
7854         audit_log_nfcfg(buf,
7855                         family,
7856                         obj->handle,
7857                         event == NFT_MSG_NEWOBJ ?
7858                                  AUDIT_NFT_OP_OBJ_REGISTER :
7859                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7860                         gfp);
7861         kfree(buf);
7862
7863         if (!report &&
7864             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7865                 return;
7866
7867         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7868         if (skb == NULL)
7869                 goto err;
7870
7871         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7872                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7873                                       family, table, obj, false);
7874         if (err < 0) {
7875                 kfree_skb(skb);
7876                 goto err;
7877         }
7878
7879         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7880         return;
7881 err:
7882         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7883 }
7884 EXPORT_SYMBOL_GPL(nft_obj_notify);
7885
7886 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7887                                  struct nft_object *obj, int event)
7888 {
7889         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7890                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7891 }
7892
7893 /*
7894  * Flow tables
7895  */
7896 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7897 {
7898         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7899         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7900         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7901 }
7902 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7903
7904 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7905 {
7906         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7907         list_del_rcu(&type->list);
7908         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7909 }
7910 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7911
7912 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7913         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7914                                             .len = NFT_NAME_MAXLEN - 1 },
7915         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7916                                             .len = NFT_NAME_MAXLEN - 1 },
7917         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7918         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7919         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7920 };
7921
7922 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7923                                            const struct nlattr *nla, u8 genmask)
7924 {
7925         struct nft_flowtable *flowtable;
7926
7927         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7928                 if (!nla_strcmp(nla, flowtable->name) &&
7929                     nft_active_genmask(flowtable, genmask))
7930                         return flowtable;
7931         }
7932         return ERR_PTR(-ENOENT);
7933 }
7934 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7935
7936 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7937                                     struct nft_flowtable *flowtable,
7938                                     enum nft_trans_phase phase)
7939 {
7940         switch (phase) {
7941         case NFT_TRANS_PREPARE_ERROR:
7942         case NFT_TRANS_PREPARE:
7943         case NFT_TRANS_ABORT:
7944         case NFT_TRANS_RELEASE:
7945                 nft_use_dec(&flowtable->use);
7946                 fallthrough;
7947         default:
7948                 return;
7949         }
7950 }
7951 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7952
7953 static struct nft_flowtable *
7954 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7955                               const struct nlattr *nla, u8 genmask)
7956 {
7957        struct nft_flowtable *flowtable;
7958
7959        list_for_each_entry(flowtable, &table->flowtables, list) {
7960                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7961                    nft_active_genmask(flowtable, genmask))
7962                        return flowtable;
7963        }
7964        return ERR_PTR(-ENOENT);
7965 }
7966
7967 struct nft_flowtable_hook {
7968         u32                     num;
7969         int                     priority;
7970         struct list_head        list;
7971 };
7972
7973 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7974         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7975         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7976         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7977 };
7978
7979 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7980                                     const struct nlattr * const nla[],
7981                                     struct nft_flowtable_hook *flowtable_hook,
7982                                     struct nft_flowtable *flowtable,
7983                                     struct netlink_ext_ack *extack, bool add)
7984 {
7985         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7986         struct nft_hook *hook;
7987         int hooknum, priority;
7988         int err;
7989
7990         INIT_LIST_HEAD(&flowtable_hook->list);
7991
7992         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
7993                                           nla[NFTA_FLOWTABLE_HOOK],
7994                                           nft_flowtable_hook_policy, NULL);
7995         if (err < 0)
7996                 return err;
7997
7998         if (add) {
7999                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8000                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8001                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8002                         return -ENOENT;
8003                 }
8004
8005                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8006                 if (hooknum != NF_NETDEV_INGRESS)
8007                         return -EOPNOTSUPP;
8008
8009                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8010
8011                 flowtable_hook->priority        = priority;
8012                 flowtable_hook->num             = hooknum;
8013         } else {
8014                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8015                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8016                         if (hooknum != flowtable->hooknum)
8017                                 return -EOPNOTSUPP;
8018                 }
8019
8020                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8021                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8022                         if (priority != flowtable->data.priority)
8023                                 return -EOPNOTSUPP;
8024                 }
8025
8026                 flowtable_hook->priority        = flowtable->data.priority;
8027                 flowtable_hook->num             = flowtable->hooknum;
8028         }
8029
8030         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8031                 err = nf_tables_parse_netdev_hooks(ctx->net,
8032                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
8033                                                    &flowtable_hook->list,
8034                                                    extack);
8035                 if (err < 0)
8036                         return err;
8037         }
8038
8039         list_for_each_entry(hook, &flowtable_hook->list, list) {
8040                 hook->ops.pf            = NFPROTO_NETDEV;
8041                 hook->ops.hooknum       = flowtable_hook->num;
8042                 hook->ops.priority      = flowtable_hook->priority;
8043                 hook->ops.priv          = &flowtable->data;
8044                 hook->ops.hook          = flowtable->data.type->hook;
8045         }
8046
8047         return err;
8048 }
8049
8050 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8051 {
8052         const struct nf_flowtable_type *type;
8053
8054         list_for_each_entry(type, &nf_tables_flowtables, list) {
8055                 if (family == type->family)
8056                         return type;
8057         }
8058         return NULL;
8059 }
8060
8061 static const struct nf_flowtable_type *
8062 nft_flowtable_type_get(struct net *net, u8 family)
8063 {
8064         const struct nf_flowtable_type *type;
8065
8066         type = __nft_flowtable_type_get(family);
8067         if (type != NULL && try_module_get(type->owner))
8068                 return type;
8069
8070         lockdep_nfnl_nft_mutex_not_held();
8071 #ifdef CONFIG_MODULES
8072         if (type == NULL) {
8073                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8074                         return ERR_PTR(-EAGAIN);
8075         }
8076 #endif
8077         return ERR_PTR(-ENOENT);
8078 }
8079
8080 /* Only called from error and netdev event paths. */
8081 static void nft_unregister_flowtable_hook(struct net *net,
8082                                           struct nft_flowtable *flowtable,
8083                                           struct nft_hook *hook)
8084 {
8085         nf_unregister_net_hook(net, &hook->ops);
8086         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8087                                     FLOW_BLOCK_UNBIND);
8088 }
8089
8090 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8091                                                  struct list_head *hook_list,
8092                                                  bool release_netdev)
8093 {
8094         struct nft_hook *hook, *next;
8095
8096         list_for_each_entry_safe(hook, next, hook_list, list) {
8097                 nf_unregister_net_hook(net, &hook->ops);
8098                 if (release_netdev) {
8099                         list_del(&hook->list);
8100                         kfree_rcu(hook, rcu);
8101                 }
8102         }
8103 }
8104
8105 static void nft_unregister_flowtable_net_hooks(struct net *net,
8106                                                struct list_head *hook_list)
8107 {
8108         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8109 }
8110
8111 static int nft_register_flowtable_net_hooks(struct net *net,
8112                                             struct nft_table *table,
8113                                             struct list_head *hook_list,
8114                                             struct nft_flowtable *flowtable)
8115 {
8116         struct nft_hook *hook, *hook2, *next;
8117         struct nft_flowtable *ft;
8118         int err, i = 0;
8119
8120         list_for_each_entry(hook, hook_list, list) {
8121                 list_for_each_entry(ft, &table->flowtables, list) {
8122                         if (!nft_is_active_next(net, ft))
8123                                 continue;
8124
8125                         list_for_each_entry(hook2, &ft->hook_list, list) {
8126                                 if (hook->ops.dev == hook2->ops.dev &&
8127                                     hook->ops.pf == hook2->ops.pf) {
8128                                         err = -EEXIST;
8129                                         goto err_unregister_net_hooks;
8130                                 }
8131                         }
8132                 }
8133
8134                 err = flowtable->data.type->setup(&flowtable->data,
8135                                                   hook->ops.dev,
8136                                                   FLOW_BLOCK_BIND);
8137                 if (err < 0)
8138                         goto err_unregister_net_hooks;
8139
8140                 err = nf_register_net_hook(net, &hook->ops);
8141                 if (err < 0) {
8142                         flowtable->data.type->setup(&flowtable->data,
8143                                                     hook->ops.dev,
8144                                                     FLOW_BLOCK_UNBIND);
8145                         goto err_unregister_net_hooks;
8146                 }
8147
8148                 i++;
8149         }
8150
8151         return 0;
8152
8153 err_unregister_net_hooks:
8154         list_for_each_entry_safe(hook, next, hook_list, list) {
8155                 if (i-- <= 0)
8156                         break;
8157
8158                 nft_unregister_flowtable_hook(net, flowtable, hook);
8159                 list_del_rcu(&hook->list);
8160                 kfree_rcu(hook, rcu);
8161         }
8162
8163         return err;
8164 }
8165
8166 static void nft_hooks_destroy(struct list_head *hook_list)
8167 {
8168         struct nft_hook *hook, *next;
8169
8170         list_for_each_entry_safe(hook, next, hook_list, list) {
8171                 list_del_rcu(&hook->list);
8172                 kfree_rcu(hook, rcu);
8173         }
8174 }
8175
8176 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8177                                 struct nft_flowtable *flowtable,
8178                                 struct netlink_ext_ack *extack)
8179 {
8180         const struct nlattr * const *nla = ctx->nla;
8181         struct nft_flowtable_hook flowtable_hook;
8182         struct nft_hook *hook, *next;
8183         struct nft_trans *trans;
8184         bool unregister = false;
8185         u32 flags;
8186         int err;
8187
8188         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8189                                        extack, false);
8190         if (err < 0)
8191                 return err;
8192
8193         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8194                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8195                         list_del(&hook->list);
8196                         kfree(hook);
8197                 }
8198         }
8199
8200         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8201                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8202                 if (flags & ~NFT_FLOWTABLE_MASK) {
8203                         err = -EOPNOTSUPP;
8204                         goto err_flowtable_update_hook;
8205                 }
8206                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8207                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8208                         err = -EOPNOTSUPP;
8209                         goto err_flowtable_update_hook;
8210                 }
8211         } else {
8212                 flags = flowtable->data.flags;
8213         }
8214
8215         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8216                                                &flowtable_hook.list, flowtable);
8217         if (err < 0)
8218                 goto err_flowtable_update_hook;
8219
8220         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8221                                 sizeof(struct nft_trans_flowtable));
8222         if (!trans) {
8223                 unregister = true;
8224                 err = -ENOMEM;
8225                 goto err_flowtable_update_hook;
8226         }
8227
8228         nft_trans_flowtable_flags(trans) = flags;
8229         nft_trans_flowtable(trans) = flowtable;
8230         nft_trans_flowtable_update(trans) = true;
8231         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8232         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8233
8234         nft_trans_commit_list_add_tail(ctx->net, trans);
8235
8236         return 0;
8237
8238 err_flowtable_update_hook:
8239         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8240                 if (unregister)
8241                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8242                 list_del_rcu(&hook->list);
8243                 kfree_rcu(hook, rcu);
8244         }
8245
8246         return err;
8247
8248 }
8249
8250 static int nf_tables_newflowtable(struct sk_buff *skb,
8251                                   const struct nfnl_info *info,
8252                                   const struct nlattr * const nla[])
8253 {
8254         struct netlink_ext_ack *extack = info->extack;
8255         struct nft_flowtable_hook flowtable_hook;
8256         u8 genmask = nft_genmask_next(info->net);
8257         u8 family = info->nfmsg->nfgen_family;
8258         const struct nf_flowtable_type *type;
8259         struct nft_flowtable *flowtable;
8260         struct nft_hook *hook, *next;
8261         struct net *net = info->net;
8262         struct nft_table *table;
8263         struct nft_ctx ctx;
8264         int err;
8265
8266         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8267             !nla[NFTA_FLOWTABLE_NAME] ||
8268             !nla[NFTA_FLOWTABLE_HOOK])
8269                 return -EINVAL;
8270
8271         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8272                                  genmask, NETLINK_CB(skb).portid);
8273         if (IS_ERR(table)) {
8274                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8275                 return PTR_ERR(table);
8276         }
8277
8278         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8279                                          genmask);
8280         if (IS_ERR(flowtable)) {
8281                 err = PTR_ERR(flowtable);
8282                 if (err != -ENOENT) {
8283                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8284                         return err;
8285                 }
8286         } else {
8287                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8288                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8289                         return -EEXIST;
8290                 }
8291
8292                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8293
8294                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8295         }
8296
8297         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8298
8299         if (!nft_use_inc(&table->use))
8300                 return -EMFILE;
8301
8302         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8303         if (!flowtable) {
8304                 err = -ENOMEM;
8305                 goto flowtable_alloc;
8306         }
8307
8308         flowtable->table = table;
8309         flowtable->handle = nf_tables_alloc_handle(table);
8310         INIT_LIST_HEAD(&flowtable->hook_list);
8311
8312         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8313         if (!flowtable->name) {
8314                 err = -ENOMEM;
8315                 goto err1;
8316         }
8317
8318         type = nft_flowtable_type_get(net, family);
8319         if (IS_ERR(type)) {
8320                 err = PTR_ERR(type);
8321                 goto err2;
8322         }
8323
8324         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8325                 flowtable->data.flags =
8326                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8327                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8328                         err = -EOPNOTSUPP;
8329                         goto err3;
8330                 }
8331         }
8332
8333         write_pnet(&flowtable->data.net, net);
8334         flowtable->data.type = type;
8335         err = type->init(&flowtable->data);
8336         if (err < 0)
8337                 goto err3;
8338
8339         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8340                                        extack, true);
8341         if (err < 0)
8342                 goto err4;
8343
8344         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8345         flowtable->data.priority = flowtable_hook.priority;
8346         flowtable->hooknum = flowtable_hook.num;
8347
8348         err = nft_register_flowtable_net_hooks(ctx.net, table,
8349                                                &flowtable->hook_list,
8350                                                flowtable);
8351         if (err < 0) {
8352                 nft_hooks_destroy(&flowtable->hook_list);
8353                 goto err4;
8354         }
8355
8356         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8357         if (err < 0)
8358                 goto err5;
8359
8360         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8361
8362         return 0;
8363 err5:
8364         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8365                 nft_unregister_flowtable_hook(net, flowtable, hook);
8366                 list_del_rcu(&hook->list);
8367                 kfree_rcu(hook, rcu);
8368         }
8369 err4:
8370         flowtable->data.type->free(&flowtable->data);
8371 err3:
8372         module_put(type->owner);
8373 err2:
8374         kfree(flowtable->name);
8375 err1:
8376         kfree(flowtable);
8377 flowtable_alloc:
8378         nft_use_dec_restore(&table->use);
8379
8380         return err;
8381 }
8382
8383 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8384 {
8385         struct nft_hook *this, *next;
8386
8387         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8388                 list_del(&this->list);
8389                 kfree(this);
8390         }
8391 }
8392
8393 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8394                                  struct nft_flowtable *flowtable,
8395                                  struct netlink_ext_ack *extack)
8396 {
8397         const struct nlattr * const *nla = ctx->nla;
8398         struct nft_flowtable_hook flowtable_hook;
8399         LIST_HEAD(flowtable_del_list);
8400         struct nft_hook *this, *hook;
8401         struct nft_trans *trans;
8402         int err;
8403
8404         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8405                                        extack, false);
8406         if (err < 0)
8407                 return err;
8408
8409         list_for_each_entry(this, &flowtable_hook.list, list) {
8410                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8411                 if (!hook) {
8412                         err = -ENOENT;
8413                         goto err_flowtable_del_hook;
8414                 }
8415                 list_move(&hook->list, &flowtable_del_list);
8416         }
8417
8418         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8419                                 sizeof(struct nft_trans_flowtable));
8420         if (!trans) {
8421                 err = -ENOMEM;
8422                 goto err_flowtable_del_hook;
8423         }
8424
8425         nft_trans_flowtable(trans) = flowtable;
8426         nft_trans_flowtable_update(trans) = true;
8427         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8428         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8429         nft_flowtable_hook_release(&flowtable_hook);
8430
8431         nft_trans_commit_list_add_tail(ctx->net, trans);
8432
8433         return 0;
8434
8435 err_flowtable_del_hook:
8436         list_splice(&flowtable_del_list, &flowtable->hook_list);
8437         nft_flowtable_hook_release(&flowtable_hook);
8438
8439         return err;
8440 }
8441
8442 static int nf_tables_delflowtable(struct sk_buff *skb,
8443                                   const struct nfnl_info *info,
8444                                   const struct nlattr * const nla[])
8445 {
8446         struct netlink_ext_ack *extack = info->extack;
8447         u8 genmask = nft_genmask_next(info->net);
8448         u8 family = info->nfmsg->nfgen_family;
8449         struct nft_flowtable *flowtable;
8450         struct net *net = info->net;
8451         const struct nlattr *attr;
8452         struct nft_table *table;
8453         struct nft_ctx ctx;
8454
8455         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8456             (!nla[NFTA_FLOWTABLE_NAME] &&
8457              !nla[NFTA_FLOWTABLE_HANDLE]))
8458                 return -EINVAL;
8459
8460         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8461                                  genmask, NETLINK_CB(skb).portid);
8462         if (IS_ERR(table)) {
8463                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8464                 return PTR_ERR(table);
8465         }
8466
8467         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8468                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8469                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8470         } else {
8471                 attr = nla[NFTA_FLOWTABLE_NAME];
8472                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8473         }
8474
8475         if (IS_ERR(flowtable)) {
8476                 if (PTR_ERR(flowtable) == -ENOENT &&
8477                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8478                         return 0;
8479
8480                 NL_SET_BAD_ATTR(extack, attr);
8481                 return PTR_ERR(flowtable);
8482         }
8483
8484         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8485
8486         if (nla[NFTA_FLOWTABLE_HOOK])
8487                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8488
8489         if (flowtable->use > 0) {
8490                 NL_SET_BAD_ATTR(extack, attr);
8491                 return -EBUSY;
8492         }
8493
8494         return nft_delflowtable(&ctx, flowtable);
8495 }
8496
8497 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8498                                          u32 portid, u32 seq, int event,
8499                                          u32 flags, int family,
8500                                          struct nft_flowtable *flowtable,
8501                                          struct list_head *hook_list)
8502 {
8503         struct nlattr *nest, *nest_devs;
8504         struct nft_hook *hook;
8505         struct nlmsghdr *nlh;
8506
8507         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8508         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8509                            NFNETLINK_V0, nft_base_seq(net));
8510         if (!nlh)
8511                 goto nla_put_failure;
8512
8513         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8514             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8515             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8516                          NFTA_FLOWTABLE_PAD))
8517                 goto nla_put_failure;
8518
8519         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8520                 nlmsg_end(skb, nlh);
8521                 return 0;
8522         }
8523
8524         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8525             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8526                 goto nla_put_failure;
8527
8528         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8529         if (!nest)
8530                 goto nla_put_failure;
8531         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8532             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8533                 goto nla_put_failure;
8534
8535         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8536         if (!nest_devs)
8537                 goto nla_put_failure;
8538
8539         if (!hook_list)
8540                 hook_list = &flowtable->hook_list;
8541
8542         list_for_each_entry_rcu(hook, hook_list, list) {
8543                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8544                         goto nla_put_failure;
8545         }
8546         nla_nest_end(skb, nest_devs);
8547         nla_nest_end(skb, nest);
8548
8549         nlmsg_end(skb, nlh);
8550         return 0;
8551
8552 nla_put_failure:
8553         nlmsg_trim(skb, nlh);
8554         return -1;
8555 }
8556
8557 struct nft_flowtable_filter {
8558         char            *table;
8559 };
8560
8561 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8562                                     struct netlink_callback *cb)
8563 {
8564         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8565         struct nft_flowtable_filter *filter = cb->data;
8566         unsigned int idx = 0, s_idx = cb->args[0];
8567         struct net *net = sock_net(skb->sk);
8568         int family = nfmsg->nfgen_family;
8569         struct nft_flowtable *flowtable;
8570         struct nftables_pernet *nft_net;
8571         const struct nft_table *table;
8572
8573         rcu_read_lock();
8574         nft_net = nft_pernet(net);
8575         cb->seq = READ_ONCE(nft_net->base_seq);
8576
8577         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8578                 if (family != NFPROTO_UNSPEC && family != table->family)
8579                         continue;
8580
8581                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8582                         if (!nft_is_active(net, flowtable))
8583                                 goto cont;
8584                         if (idx < s_idx)
8585                                 goto cont;
8586                         if (idx > s_idx)
8587                                 memset(&cb->args[1], 0,
8588                                        sizeof(cb->args) - sizeof(cb->args[0]));
8589                         if (filter && filter->table &&
8590                             strcmp(filter->table, table->name))
8591                                 goto cont;
8592
8593                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8594                                                           cb->nlh->nlmsg_seq,
8595                                                           NFT_MSG_NEWFLOWTABLE,
8596                                                           NLM_F_MULTI | NLM_F_APPEND,
8597                                                           table->family,
8598                                                           flowtable, NULL) < 0)
8599                                 goto done;
8600
8601                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8602 cont:
8603                         idx++;
8604                 }
8605         }
8606 done:
8607         rcu_read_unlock();
8608
8609         cb->args[0] = idx;
8610         return skb->len;
8611 }
8612
8613 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8614 {
8615         const struct nlattr * const *nla = cb->data;
8616         struct nft_flowtable_filter *filter = NULL;
8617
8618         if (nla[NFTA_FLOWTABLE_TABLE]) {
8619                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8620                 if (!filter)
8621                         return -ENOMEM;
8622
8623                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8624                                            GFP_ATOMIC);
8625                 if (!filter->table) {
8626                         kfree(filter);
8627                         return -ENOMEM;
8628                 }
8629         }
8630
8631         cb->data = filter;
8632         return 0;
8633 }
8634
8635 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8636 {
8637         struct nft_flowtable_filter *filter = cb->data;
8638
8639         if (!filter)
8640                 return 0;
8641
8642         kfree(filter->table);
8643         kfree(filter);
8644
8645         return 0;
8646 }
8647
8648 /* called with rcu_read_lock held */
8649 static int nf_tables_getflowtable(struct sk_buff *skb,
8650                                   const struct nfnl_info *info,
8651                                   const struct nlattr * const nla[])
8652 {
8653         u8 genmask = nft_genmask_cur(info->net);
8654         u8 family = info->nfmsg->nfgen_family;
8655         struct nft_flowtable *flowtable;
8656         const struct nft_table *table;
8657         struct net *net = info->net;
8658         struct sk_buff *skb2;
8659         int err;
8660
8661         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8662                 struct netlink_dump_control c = {
8663                         .start = nf_tables_dump_flowtable_start,
8664                         .dump = nf_tables_dump_flowtable,
8665                         .done = nf_tables_dump_flowtable_done,
8666                         .module = THIS_MODULE,
8667                         .data = (void *)nla,
8668                 };
8669
8670                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8671         }
8672
8673         if (!nla[NFTA_FLOWTABLE_NAME])
8674                 return -EINVAL;
8675
8676         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8677                                  genmask, 0);
8678         if (IS_ERR(table))
8679                 return PTR_ERR(table);
8680
8681         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8682                                          genmask);
8683         if (IS_ERR(flowtable))
8684                 return PTR_ERR(flowtable);
8685
8686         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8687         if (!skb2)
8688                 return -ENOMEM;
8689
8690         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8691                                             info->nlh->nlmsg_seq,
8692                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8693                                             flowtable, NULL);
8694         if (err < 0)
8695                 goto err_fill_flowtable_info;
8696
8697         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8698
8699 err_fill_flowtable_info:
8700         kfree_skb(skb2);
8701         return err;
8702 }
8703
8704 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8705                                        struct nft_flowtable *flowtable,
8706                                        struct list_head *hook_list, int event)
8707 {
8708         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8709         struct sk_buff *skb;
8710         u16 flags = 0;
8711         int err;
8712
8713         if (!ctx->report &&
8714             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8715                 return;
8716
8717         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8718         if (skb == NULL)
8719                 goto err;
8720
8721         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8722                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8723
8724         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8725                                             ctx->seq, event, flags,
8726                                             ctx->family, flowtable, hook_list);
8727         if (err < 0) {
8728                 kfree_skb(skb);
8729                 goto err;
8730         }
8731
8732         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8733         return;
8734 err:
8735         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8736 }
8737
8738 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8739 {
8740         struct nft_hook *hook, *next;
8741
8742         flowtable->data.type->free(&flowtable->data);
8743         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8744                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8745                                             FLOW_BLOCK_UNBIND);
8746                 list_del_rcu(&hook->list);
8747                 kfree(hook);
8748         }
8749         kfree(flowtable->name);
8750         module_put(flowtable->data.type->owner);
8751         kfree(flowtable);
8752 }
8753
8754 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8755                                    u32 portid, u32 seq)
8756 {
8757         struct nftables_pernet *nft_net = nft_pernet(net);
8758         struct nlmsghdr *nlh;
8759         char buf[TASK_COMM_LEN];
8760         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8761
8762         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8763                            NFNETLINK_V0, nft_base_seq(net));
8764         if (!nlh)
8765                 goto nla_put_failure;
8766
8767         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8768             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8769             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8770                 goto nla_put_failure;
8771
8772         nlmsg_end(skb, nlh);
8773         return 0;
8774
8775 nla_put_failure:
8776         nlmsg_trim(skb, nlh);
8777         return -EMSGSIZE;
8778 }
8779
8780 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8781                                 struct nft_flowtable *flowtable)
8782 {
8783         struct nft_hook *hook;
8784
8785         list_for_each_entry(hook, &flowtable->hook_list, list) {
8786                 if (hook->ops.dev != dev)
8787                         continue;
8788
8789                 /* flow_offload_netdev_event() cleans up entries for us. */
8790                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8791                 list_del_rcu(&hook->list);
8792                 kfree_rcu(hook, rcu);
8793                 break;
8794         }
8795 }
8796
8797 static int nf_tables_flowtable_event(struct notifier_block *this,
8798                                      unsigned long event, void *ptr)
8799 {
8800         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8801         struct nft_flowtable *flowtable;
8802         struct nftables_pernet *nft_net;
8803         struct nft_table *table;
8804         struct net *net;
8805
8806         if (event != NETDEV_UNREGISTER)
8807                 return 0;
8808
8809         net = dev_net(dev);
8810         nft_net = nft_pernet(net);
8811         mutex_lock(&nft_net->commit_mutex);
8812         list_for_each_entry(table, &nft_net->tables, list) {
8813                 list_for_each_entry(flowtable, &table->flowtables, list) {
8814                         nft_flowtable_event(event, dev, flowtable);
8815                 }
8816         }
8817         mutex_unlock(&nft_net->commit_mutex);
8818
8819         return NOTIFY_DONE;
8820 }
8821
8822 static struct notifier_block nf_tables_flowtable_notifier = {
8823         .notifier_call  = nf_tables_flowtable_event,
8824 };
8825
8826 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8827                                  int event)
8828 {
8829         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8830         struct sk_buff *skb2;
8831         int err;
8832
8833         if (!nlmsg_report(nlh) &&
8834             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8835                 return;
8836
8837         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8838         if (skb2 == NULL)
8839                 goto err;
8840
8841         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8842                                       nlh->nlmsg_seq);
8843         if (err < 0) {
8844                 kfree_skb(skb2);
8845                 goto err;
8846         }
8847
8848         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8849                        nlmsg_report(nlh), GFP_KERNEL);
8850         return;
8851 err:
8852         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8853                           -ENOBUFS);
8854 }
8855
8856 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8857                             const struct nlattr * const nla[])
8858 {
8859         struct sk_buff *skb2;
8860         int err;
8861
8862         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8863         if (skb2 == NULL)
8864                 return -ENOMEM;
8865
8866         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8867                                       info->nlh->nlmsg_seq);
8868         if (err < 0)
8869                 goto err_fill_gen_info;
8870
8871         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8872
8873 err_fill_gen_info:
8874         kfree_skb(skb2);
8875         return err;
8876 }
8877
8878 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8879         [NFT_MSG_NEWTABLE] = {
8880                 .call           = nf_tables_newtable,
8881                 .type           = NFNL_CB_BATCH,
8882                 .attr_count     = NFTA_TABLE_MAX,
8883                 .policy         = nft_table_policy,
8884         },
8885         [NFT_MSG_GETTABLE] = {
8886                 .call           = nf_tables_gettable,
8887                 .type           = NFNL_CB_RCU,
8888                 .attr_count     = NFTA_TABLE_MAX,
8889                 .policy         = nft_table_policy,
8890         },
8891         [NFT_MSG_DELTABLE] = {
8892                 .call           = nf_tables_deltable,
8893                 .type           = NFNL_CB_BATCH,
8894                 .attr_count     = NFTA_TABLE_MAX,
8895                 .policy         = nft_table_policy,
8896         },
8897         [NFT_MSG_DESTROYTABLE] = {
8898                 .call           = nf_tables_deltable,
8899                 .type           = NFNL_CB_BATCH,
8900                 .attr_count     = NFTA_TABLE_MAX,
8901                 .policy         = nft_table_policy,
8902         },
8903         [NFT_MSG_NEWCHAIN] = {
8904                 .call           = nf_tables_newchain,
8905                 .type           = NFNL_CB_BATCH,
8906                 .attr_count     = NFTA_CHAIN_MAX,
8907                 .policy         = nft_chain_policy,
8908         },
8909         [NFT_MSG_GETCHAIN] = {
8910                 .call           = nf_tables_getchain,
8911                 .type           = NFNL_CB_RCU,
8912                 .attr_count     = NFTA_CHAIN_MAX,
8913                 .policy         = nft_chain_policy,
8914         },
8915         [NFT_MSG_DELCHAIN] = {
8916                 .call           = nf_tables_delchain,
8917                 .type           = NFNL_CB_BATCH,
8918                 .attr_count     = NFTA_CHAIN_MAX,
8919                 .policy         = nft_chain_policy,
8920         },
8921         [NFT_MSG_DESTROYCHAIN] = {
8922                 .call           = nf_tables_delchain,
8923                 .type           = NFNL_CB_BATCH,
8924                 .attr_count     = NFTA_CHAIN_MAX,
8925                 .policy         = nft_chain_policy,
8926         },
8927         [NFT_MSG_NEWRULE] = {
8928                 .call           = nf_tables_newrule,
8929                 .type           = NFNL_CB_BATCH,
8930                 .attr_count     = NFTA_RULE_MAX,
8931                 .policy         = nft_rule_policy,
8932         },
8933         [NFT_MSG_GETRULE] = {
8934                 .call           = nf_tables_getrule,
8935                 .type           = NFNL_CB_RCU,
8936                 .attr_count     = NFTA_RULE_MAX,
8937                 .policy         = nft_rule_policy,
8938         },
8939         [NFT_MSG_GETRULE_RESET] = {
8940                 .call           = nf_tables_getrule,
8941                 .type           = NFNL_CB_RCU,
8942                 .attr_count     = NFTA_RULE_MAX,
8943                 .policy         = nft_rule_policy,
8944         },
8945         [NFT_MSG_DELRULE] = {
8946                 .call           = nf_tables_delrule,
8947                 .type           = NFNL_CB_BATCH,
8948                 .attr_count     = NFTA_RULE_MAX,
8949                 .policy         = nft_rule_policy,
8950         },
8951         [NFT_MSG_DESTROYRULE] = {
8952                 .call           = nf_tables_delrule,
8953                 .type           = NFNL_CB_BATCH,
8954                 .attr_count     = NFTA_RULE_MAX,
8955                 .policy         = nft_rule_policy,
8956         },
8957         [NFT_MSG_NEWSET] = {
8958                 .call           = nf_tables_newset,
8959                 .type           = NFNL_CB_BATCH,
8960                 .attr_count     = NFTA_SET_MAX,
8961                 .policy         = nft_set_policy,
8962         },
8963         [NFT_MSG_GETSET] = {
8964                 .call           = nf_tables_getset,
8965                 .type           = NFNL_CB_RCU,
8966                 .attr_count     = NFTA_SET_MAX,
8967                 .policy         = nft_set_policy,
8968         },
8969         [NFT_MSG_DELSET] = {
8970                 .call           = nf_tables_delset,
8971                 .type           = NFNL_CB_BATCH,
8972                 .attr_count     = NFTA_SET_MAX,
8973                 .policy         = nft_set_policy,
8974         },
8975         [NFT_MSG_DESTROYSET] = {
8976                 .call           = nf_tables_delset,
8977                 .type           = NFNL_CB_BATCH,
8978                 .attr_count     = NFTA_SET_MAX,
8979                 .policy         = nft_set_policy,
8980         },
8981         [NFT_MSG_NEWSETELEM] = {
8982                 .call           = nf_tables_newsetelem,
8983                 .type           = NFNL_CB_BATCH,
8984                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8985                 .policy         = nft_set_elem_list_policy,
8986         },
8987         [NFT_MSG_GETSETELEM] = {
8988                 .call           = nf_tables_getsetelem,
8989                 .type           = NFNL_CB_RCU,
8990                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8991                 .policy         = nft_set_elem_list_policy,
8992         },
8993         [NFT_MSG_GETSETELEM_RESET] = {
8994                 .call           = nf_tables_getsetelem,
8995                 .type           = NFNL_CB_RCU,
8996                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8997                 .policy         = nft_set_elem_list_policy,
8998         },
8999         [NFT_MSG_DELSETELEM] = {
9000                 .call           = nf_tables_delsetelem,
9001                 .type           = NFNL_CB_BATCH,
9002                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9003                 .policy         = nft_set_elem_list_policy,
9004         },
9005         [NFT_MSG_DESTROYSETELEM] = {
9006                 .call           = nf_tables_delsetelem,
9007                 .type           = NFNL_CB_BATCH,
9008                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9009                 .policy         = nft_set_elem_list_policy,
9010         },
9011         [NFT_MSG_GETGEN] = {
9012                 .call           = nf_tables_getgen,
9013                 .type           = NFNL_CB_RCU,
9014         },
9015         [NFT_MSG_NEWOBJ] = {
9016                 .call           = nf_tables_newobj,
9017                 .type           = NFNL_CB_BATCH,
9018                 .attr_count     = NFTA_OBJ_MAX,
9019                 .policy         = nft_obj_policy,
9020         },
9021         [NFT_MSG_GETOBJ] = {
9022                 .call           = nf_tables_getobj,
9023                 .type           = NFNL_CB_RCU,
9024                 .attr_count     = NFTA_OBJ_MAX,
9025                 .policy         = nft_obj_policy,
9026         },
9027         [NFT_MSG_DELOBJ] = {
9028                 .call           = nf_tables_delobj,
9029                 .type           = NFNL_CB_BATCH,
9030                 .attr_count     = NFTA_OBJ_MAX,
9031                 .policy         = nft_obj_policy,
9032         },
9033         [NFT_MSG_DESTROYOBJ] = {
9034                 .call           = nf_tables_delobj,
9035                 .type           = NFNL_CB_BATCH,
9036                 .attr_count     = NFTA_OBJ_MAX,
9037                 .policy         = nft_obj_policy,
9038         },
9039         [NFT_MSG_GETOBJ_RESET] = {
9040                 .call           = nf_tables_getobj,
9041                 .type           = NFNL_CB_RCU,
9042                 .attr_count     = NFTA_OBJ_MAX,
9043                 .policy         = nft_obj_policy,
9044         },
9045         [NFT_MSG_NEWFLOWTABLE] = {
9046                 .call           = nf_tables_newflowtable,
9047                 .type           = NFNL_CB_BATCH,
9048                 .attr_count     = NFTA_FLOWTABLE_MAX,
9049                 .policy         = nft_flowtable_policy,
9050         },
9051         [NFT_MSG_GETFLOWTABLE] = {
9052                 .call           = nf_tables_getflowtable,
9053                 .type           = NFNL_CB_RCU,
9054                 .attr_count     = NFTA_FLOWTABLE_MAX,
9055                 .policy         = nft_flowtable_policy,
9056         },
9057         [NFT_MSG_DELFLOWTABLE] = {
9058                 .call           = nf_tables_delflowtable,
9059                 .type           = NFNL_CB_BATCH,
9060                 .attr_count     = NFTA_FLOWTABLE_MAX,
9061                 .policy         = nft_flowtable_policy,
9062         },
9063         [NFT_MSG_DESTROYFLOWTABLE] = {
9064                 .call           = nf_tables_delflowtable,
9065                 .type           = NFNL_CB_BATCH,
9066                 .attr_count     = NFTA_FLOWTABLE_MAX,
9067                 .policy         = nft_flowtable_policy,
9068         },
9069 };
9070
9071 static int nf_tables_validate(struct net *net)
9072 {
9073         struct nftables_pernet *nft_net = nft_pernet(net);
9074         struct nft_table *table;
9075
9076         list_for_each_entry(table, &nft_net->tables, list) {
9077                 switch (table->validate_state) {
9078                 case NFT_VALIDATE_SKIP:
9079                         continue;
9080                 case NFT_VALIDATE_NEED:
9081                         nft_validate_state_update(table, NFT_VALIDATE_DO);
9082                         fallthrough;
9083                 case NFT_VALIDATE_DO:
9084                         if (nft_table_validate(net, table) < 0)
9085                                 return -EAGAIN;
9086
9087                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9088                 }
9089
9090                 break;
9091         }
9092
9093         return 0;
9094 }
9095
9096 /* a drop policy has to be deferred until all rules have been activated,
9097  * otherwise a large ruleset that contains a drop-policy base chain will
9098  * cause all packets to get dropped until the full transaction has been
9099  * processed.
9100  *
9101  * We defer the drop policy until the transaction has been finalized.
9102  */
9103 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9104 {
9105         struct nft_base_chain *basechain;
9106
9107         if (nft_trans_chain_policy(trans) != NF_DROP)
9108                 return;
9109
9110         if (!nft_is_base_chain(trans->ctx.chain))
9111                 return;
9112
9113         basechain = nft_base_chain(trans->ctx.chain);
9114         basechain->policy = NF_DROP;
9115 }
9116
9117 static void nft_chain_commit_update(struct nft_trans *trans)
9118 {
9119         struct nft_base_chain *basechain;
9120
9121         if (nft_trans_chain_name(trans)) {
9122                 rhltable_remove(&trans->ctx.table->chains_ht,
9123                                 &trans->ctx.chain->rhlhead,
9124                                 nft_chain_ht_params);
9125                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9126                 rhltable_insert_key(&trans->ctx.table->chains_ht,
9127                                     trans->ctx.chain->name,
9128                                     &trans->ctx.chain->rhlhead,
9129                                     nft_chain_ht_params);
9130         }
9131
9132         if (!nft_is_base_chain(trans->ctx.chain))
9133                 return;
9134
9135         nft_chain_stats_replace(trans);
9136
9137         basechain = nft_base_chain(trans->ctx.chain);
9138
9139         switch (nft_trans_chain_policy(trans)) {
9140         case NF_DROP:
9141         case NF_ACCEPT:
9142                 basechain->policy = nft_trans_chain_policy(trans);
9143                 break;
9144         }
9145 }
9146
9147 static void nft_obj_commit_update(struct nft_trans *trans)
9148 {
9149         struct nft_object *newobj;
9150         struct nft_object *obj;
9151
9152         obj = nft_trans_obj(trans);
9153         newobj = nft_trans_obj_newobj(trans);
9154
9155         if (obj->ops->update)
9156                 obj->ops->update(obj, newobj);
9157
9158         nft_obj_destroy(&trans->ctx, newobj);
9159 }
9160
9161 static void nft_commit_release(struct nft_trans *trans)
9162 {
9163         switch (trans->msg_type) {
9164         case NFT_MSG_DELTABLE:
9165         case NFT_MSG_DESTROYTABLE:
9166                 nf_tables_table_destroy(&trans->ctx);
9167                 break;
9168         case NFT_MSG_NEWCHAIN:
9169                 free_percpu(nft_trans_chain_stats(trans));
9170                 kfree(nft_trans_chain_name(trans));
9171                 break;
9172         case NFT_MSG_DELCHAIN:
9173         case NFT_MSG_DESTROYCHAIN:
9174                 if (nft_trans_chain_update(trans))
9175                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9176                 else
9177                         nf_tables_chain_destroy(&trans->ctx);
9178                 break;
9179         case NFT_MSG_DELRULE:
9180         case NFT_MSG_DESTROYRULE:
9181                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9182                 break;
9183         case NFT_MSG_DELSET:
9184         case NFT_MSG_DESTROYSET:
9185                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9186                 break;
9187         case NFT_MSG_DELSETELEM:
9188         case NFT_MSG_DESTROYSETELEM:
9189                 nf_tables_set_elem_destroy(&trans->ctx,
9190                                            nft_trans_elem_set(trans),
9191                                            nft_trans_elem(trans).priv);
9192                 break;
9193         case NFT_MSG_DELOBJ:
9194         case NFT_MSG_DESTROYOBJ:
9195                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9196                 break;
9197         case NFT_MSG_DELFLOWTABLE:
9198         case NFT_MSG_DESTROYFLOWTABLE:
9199                 if (nft_trans_flowtable_update(trans))
9200                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9201                 else
9202                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9203                 break;
9204         }
9205
9206         if (trans->put_net)
9207                 put_net(trans->ctx.net);
9208
9209         kfree(trans);
9210 }
9211
9212 static void nf_tables_trans_destroy_work(struct work_struct *w)
9213 {
9214         struct nft_trans *trans, *next;
9215         LIST_HEAD(head);
9216
9217         spin_lock(&nf_tables_destroy_list_lock);
9218         list_splice_init(&nf_tables_destroy_list, &head);
9219         spin_unlock(&nf_tables_destroy_list_lock);
9220
9221         if (list_empty(&head))
9222                 return;
9223
9224         synchronize_rcu();
9225
9226         list_for_each_entry_safe(trans, next, &head, list) {
9227                 nft_trans_list_del(trans);
9228                 nft_commit_release(trans);
9229         }
9230 }
9231
9232 void nf_tables_trans_destroy_flush_work(void)
9233 {
9234         flush_work(&trans_destroy_work);
9235 }
9236 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9237
9238 static bool nft_expr_reduce(struct nft_regs_track *track,
9239                             const struct nft_expr *expr)
9240 {
9241         return false;
9242 }
9243
9244 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9245 {
9246         const struct nft_expr *expr, *last;
9247         struct nft_regs_track track = {};
9248         unsigned int size, data_size;
9249         void *data, *data_boundary;
9250         struct nft_rule_dp *prule;
9251         struct nft_rule *rule;
9252
9253         /* already handled or inactive chain? */
9254         if (chain->blob_next || !nft_is_active_next(net, chain))
9255                 return 0;
9256
9257         data_size = 0;
9258         list_for_each_entry(rule, &chain->rules, list) {
9259                 if (nft_is_active_next(net, rule)) {
9260                         data_size += sizeof(*prule) + rule->dlen;
9261                         if (data_size > INT_MAX)
9262                                 return -ENOMEM;
9263                 }
9264         }
9265
9266         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9267         if (!chain->blob_next)
9268                 return -ENOMEM;
9269
9270         data = (void *)chain->blob_next->data;
9271         data_boundary = data + data_size;
9272         size = 0;
9273
9274         list_for_each_entry(rule, &chain->rules, list) {
9275                 if (!nft_is_active_next(net, rule))
9276                         continue;
9277
9278                 prule = (struct nft_rule_dp *)data;
9279                 data += offsetof(struct nft_rule_dp, data);
9280                 if (WARN_ON_ONCE(data > data_boundary))
9281                         return -ENOMEM;
9282
9283                 size = 0;
9284                 track.last = nft_expr_last(rule);
9285                 nft_rule_for_each_expr(expr, last, rule) {
9286                         track.cur = expr;
9287
9288                         if (nft_expr_reduce(&track, expr)) {
9289                                 expr = track.cur;
9290                                 continue;
9291                         }
9292
9293                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9294                                 return -ENOMEM;
9295
9296                         memcpy(data + size, expr, expr->ops->size);
9297                         size += expr->ops->size;
9298                 }
9299                 if (WARN_ON_ONCE(size >= 1 << 12))
9300                         return -ENOMEM;
9301
9302                 prule->handle = rule->handle;
9303                 prule->dlen = size;
9304                 prule->is_last = 0;
9305
9306                 data += size;
9307                 size = 0;
9308                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9309         }
9310
9311         if (WARN_ON_ONCE(data > data_boundary))
9312                 return -ENOMEM;
9313
9314         prule = (struct nft_rule_dp *)data;
9315         nft_last_rule(chain, prule);
9316
9317         return 0;
9318 }
9319
9320 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9321 {
9322         struct nftables_pernet *nft_net = nft_pernet(net);
9323         struct nft_trans *trans, *next;
9324
9325         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9326                 struct nft_chain *chain = trans->ctx.chain;
9327
9328                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9329                     trans->msg_type == NFT_MSG_DELRULE) {
9330                         kvfree(chain->blob_next);
9331                         chain->blob_next = NULL;
9332                 }
9333         }
9334 }
9335
9336 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9337 {
9338         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9339
9340         kvfree(l->blob);
9341 }
9342
9343 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9344 {
9345         struct nft_rule_dp_last *last;
9346
9347         /* last rule trailer is after end marker */
9348         last = (void *)blob + sizeof(*blob) + blob->size;
9349         last->blob = blob;
9350
9351         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9352 }
9353
9354 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9355 {
9356         struct nft_rule_blob *g0, *g1;
9357         bool next_genbit;
9358
9359         next_genbit = nft_gencursor_next(net);
9360
9361         g0 = rcu_dereference_protected(chain->blob_gen_0,
9362                                        lockdep_commit_lock_is_held(net));
9363         g1 = rcu_dereference_protected(chain->blob_gen_1,
9364                                        lockdep_commit_lock_is_held(net));
9365
9366         /* No changes to this chain? */
9367         if (chain->blob_next == NULL) {
9368                 /* chain had no change in last or next generation */
9369                 if (g0 == g1)
9370                         return;
9371                 /*
9372                  * chain had no change in this generation; make sure next
9373                  * one uses same rules as current generation.
9374                  */
9375                 if (next_genbit) {
9376                         rcu_assign_pointer(chain->blob_gen_1, g0);
9377                         nf_tables_commit_chain_free_rules_old(g1);
9378                 } else {
9379                         rcu_assign_pointer(chain->blob_gen_0, g1);
9380                         nf_tables_commit_chain_free_rules_old(g0);
9381                 }
9382
9383                 return;
9384         }
9385
9386         if (next_genbit)
9387                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9388         else
9389                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9390
9391         chain->blob_next = NULL;
9392
9393         if (g0 == g1)
9394                 return;
9395
9396         if (next_genbit)
9397                 nf_tables_commit_chain_free_rules_old(g1);
9398         else
9399                 nf_tables_commit_chain_free_rules_old(g0);
9400 }
9401
9402 static void nft_obj_del(struct nft_object *obj)
9403 {
9404         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9405         list_del_rcu(&obj->list);
9406 }
9407
9408 void nft_chain_del(struct nft_chain *chain)
9409 {
9410         struct nft_table *table = chain->table;
9411
9412         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9413                                      nft_chain_ht_params));
9414         list_del_rcu(&chain->list);
9415 }
9416
9417 static void nf_tables_module_autoload_cleanup(struct net *net)
9418 {
9419         struct nftables_pernet *nft_net = nft_pernet(net);
9420         struct nft_module_request *req, *next;
9421
9422         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9423         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9424                 WARN_ON_ONCE(!req->done);
9425                 list_del(&req->list);
9426                 kfree(req);
9427         }
9428 }
9429
9430 static void nf_tables_commit_release(struct net *net)
9431 {
9432         struct nftables_pernet *nft_net = nft_pernet(net);
9433         struct nft_trans *trans;
9434
9435         /* all side effects have to be made visible.
9436          * For example, if a chain named 'foo' has been deleted, a
9437          * new transaction must not find it anymore.
9438          *
9439          * Memory reclaim happens asynchronously from work queue
9440          * to prevent expensive synchronize_rcu() in commit phase.
9441          */
9442         if (list_empty(&nft_net->commit_list)) {
9443                 nf_tables_module_autoload_cleanup(net);
9444                 mutex_unlock(&nft_net->commit_mutex);
9445                 return;
9446         }
9447
9448         trans = list_last_entry(&nft_net->commit_list,
9449                                 struct nft_trans, list);
9450         get_net(trans->ctx.net);
9451         WARN_ON_ONCE(trans->put_net);
9452
9453         trans->put_net = true;
9454         spin_lock(&nf_tables_destroy_list_lock);
9455         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9456         spin_unlock(&nf_tables_destroy_list_lock);
9457
9458         nf_tables_module_autoload_cleanup(net);
9459         schedule_work(&trans_destroy_work);
9460
9461         mutex_unlock(&nft_net->commit_mutex);
9462 }
9463
9464 static void nft_commit_notify(struct net *net, u32 portid)
9465 {
9466         struct nftables_pernet *nft_net = nft_pernet(net);
9467         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9468         unsigned char *data;
9469         int len;
9470
9471         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9472                 if (!batch_skb) {
9473 new_batch:
9474                         batch_skb = skb;
9475                         len = NLMSG_GOODSIZE - skb->len;
9476                         list_del(&skb->list);
9477                         continue;
9478                 }
9479                 len -= skb->len;
9480                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9481                         data = skb_put(batch_skb, skb->len);
9482                         memcpy(data, skb->data, skb->len);
9483                         list_del(&skb->list);
9484                         kfree_skb(skb);
9485                         continue;
9486                 }
9487                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9488                                NFT_CB(batch_skb).report, GFP_KERNEL);
9489                 goto new_batch;
9490         }
9491
9492         if (batch_skb) {
9493                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9494                                NFT_CB(batch_skb).report, GFP_KERNEL);
9495         }
9496
9497         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9498 }
9499
9500 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9501                                         struct nft_table *table)
9502 {
9503         struct nft_audit_data *adp;
9504
9505         list_for_each_entry(adp, adl, list) {
9506                 if (adp->table == table)
9507                         return 0;
9508         }
9509         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9510         if (!adp)
9511                 return -ENOMEM;
9512         adp->table = table;
9513         list_add(&adp->list, adl);
9514         return 0;
9515 }
9516
9517 static void nf_tables_commit_audit_free(struct list_head *adl)
9518 {
9519         struct nft_audit_data *adp, *adn;
9520
9521         list_for_each_entry_safe(adp, adn, adl, list) {
9522                 list_del(&adp->list);
9523                 kfree(adp);
9524         }
9525 }
9526
9527 static void nf_tables_commit_audit_collect(struct list_head *adl,
9528                                            struct nft_table *table, u32 op)
9529 {
9530         struct nft_audit_data *adp;
9531
9532         list_for_each_entry(adp, adl, list) {
9533                 if (adp->table == table)
9534                         goto found;
9535         }
9536         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9537         return;
9538 found:
9539         adp->entries++;
9540         if (!adp->op || adp->op > op)
9541                 adp->op = op;
9542 }
9543
9544 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9545
9546 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9547 {
9548         struct nft_audit_data *adp, *adn;
9549         char aubuf[AUNFTABLENAMELEN];
9550
9551         list_for_each_entry_safe(adp, adn, adl, list) {
9552                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9553                          generation);
9554                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9555                                 nft2audit_op[adp->op], GFP_KERNEL);
9556                 list_del(&adp->list);
9557                 kfree(adp);
9558         }
9559 }
9560
9561 static void nft_set_commit_update(struct list_head *set_update_list)
9562 {
9563         struct nft_set *set, *next;
9564
9565         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9566                 list_del_init(&set->pending_update);
9567
9568                 if (!set->ops->commit)
9569                         continue;
9570
9571                 set->ops->commit(set);
9572         }
9573 }
9574
9575 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9576 {
9577         struct nftables_pernet *nft_net = nft_pernet(net);
9578         struct nft_trans *trans, *next;
9579         LIST_HEAD(set_update_list);
9580         struct nft_trans_elem *te;
9581         struct nft_chain *chain;
9582         struct nft_table *table;
9583         unsigned int base_seq;
9584         LIST_HEAD(adl);
9585         int err;
9586
9587         if (list_empty(&nft_net->commit_list)) {
9588                 mutex_unlock(&nft_net->commit_mutex);
9589                 return 0;
9590         }
9591
9592         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9593                 switch (trans->msg_type) {
9594                 case NFT_MSG_NEWSET:
9595                         if (!nft_trans_set_update(trans) &&
9596                             nft_set_is_anonymous(nft_trans_set(trans)) &&
9597                             !nft_trans_set_bound(trans)) {
9598                                 pr_warn_once("nftables ruleset with unbound set\n");
9599                                 return -EINVAL;
9600                         }
9601                         break;
9602                 case NFT_MSG_NEWCHAIN:
9603                         if (!nft_trans_chain_update(trans) &&
9604                             nft_chain_binding(nft_trans_chain(trans)) &&
9605                             !nft_trans_chain_bound(trans)) {
9606                                 pr_warn_once("nftables ruleset with unbound chain\n");
9607                                 return -EINVAL;
9608                         }
9609                         break;
9610                 }
9611         }
9612
9613         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9614         if (nf_tables_validate(net) < 0)
9615                 return -EAGAIN;
9616
9617         err = nft_flow_rule_offload_commit(net);
9618         if (err < 0)
9619                 return err;
9620
9621         /* 1.  Allocate space for next generation rules_gen_X[] */
9622         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9623                 int ret;
9624
9625                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9626                 if (ret) {
9627                         nf_tables_commit_chain_prepare_cancel(net);
9628                         nf_tables_commit_audit_free(&adl);
9629                         return ret;
9630                 }
9631                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9632                     trans->msg_type == NFT_MSG_DELRULE) {
9633                         chain = trans->ctx.chain;
9634
9635                         ret = nf_tables_commit_chain_prepare(net, chain);
9636                         if (ret < 0) {
9637                                 nf_tables_commit_chain_prepare_cancel(net);
9638                                 nf_tables_commit_audit_free(&adl);
9639                                 return ret;
9640                         }
9641                 }
9642         }
9643
9644         /* step 2.  Make rules_gen_X visible to packet path */
9645         list_for_each_entry(table, &nft_net->tables, list) {
9646                 list_for_each_entry(chain, &table->chains, list)
9647                         nf_tables_commit_chain(net, chain);
9648         }
9649
9650         /*
9651          * Bump generation counter, invalidate any dump in progress.
9652          * Cannot fail after this point.
9653          */
9654         base_seq = READ_ONCE(nft_net->base_seq);
9655         while (++base_seq == 0)
9656                 ;
9657
9658         WRITE_ONCE(nft_net->base_seq, base_seq);
9659
9660         /* step 3. Start new generation, rules_gen_X now in use. */
9661         net->nft.gencursor = nft_gencursor_next(net);
9662
9663         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9664                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9665                                                trans->msg_type);
9666                 switch (trans->msg_type) {
9667                 case NFT_MSG_NEWTABLE:
9668                         if (nft_trans_table_update(trans)) {
9669                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9670                                         nft_trans_destroy(trans);
9671                                         break;
9672                                 }
9673                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9674                                         nf_tables_table_disable(net, trans->ctx.table);
9675
9676                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9677                         } else {
9678                                 nft_clear(net, trans->ctx.table);
9679                         }
9680                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9681                         nft_trans_destroy(trans);
9682                         break;
9683                 case NFT_MSG_DELTABLE:
9684                 case NFT_MSG_DESTROYTABLE:
9685                         list_del_rcu(&trans->ctx.table->list);
9686                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
9687                         break;
9688                 case NFT_MSG_NEWCHAIN:
9689                         if (nft_trans_chain_update(trans)) {
9690                                 nft_chain_commit_update(trans);
9691                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9692                                                        &nft_trans_chain_hooks(trans));
9693                                 list_splice(&nft_trans_chain_hooks(trans),
9694                                             &nft_trans_basechain(trans)->hook_list);
9695                                 /* trans destroyed after rcu grace period */
9696                         } else {
9697                                 nft_chain_commit_drop_policy(trans);
9698                                 nft_clear(net, trans->ctx.chain);
9699                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9700                                 nft_trans_destroy(trans);
9701                         }
9702                         break;
9703                 case NFT_MSG_DELCHAIN:
9704                 case NFT_MSG_DESTROYCHAIN:
9705                         if (nft_trans_chain_update(trans)) {
9706                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9707                                                        &nft_trans_chain_hooks(trans));
9708                                 nft_netdev_unregister_hooks(net,
9709                                                             &nft_trans_chain_hooks(trans),
9710                                                             true);
9711                         } else {
9712                                 nft_chain_del(trans->ctx.chain);
9713                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9714                                                        NULL);
9715                                 nf_tables_unregister_hook(trans->ctx.net,
9716                                                           trans->ctx.table,
9717                                                           trans->ctx.chain);
9718                         }
9719                         break;
9720                 case NFT_MSG_NEWRULE:
9721                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9722                         nf_tables_rule_notify(&trans->ctx,
9723                                               nft_trans_rule(trans),
9724                                               NFT_MSG_NEWRULE);
9725                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9726                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9727
9728                         nft_trans_destroy(trans);
9729                         break;
9730                 case NFT_MSG_DELRULE:
9731                 case NFT_MSG_DESTROYRULE:
9732                         list_del_rcu(&nft_trans_rule(trans)->list);
9733                         nf_tables_rule_notify(&trans->ctx,
9734                                               nft_trans_rule(trans),
9735                                               trans->msg_type);
9736                         nft_rule_expr_deactivate(&trans->ctx,
9737                                                  nft_trans_rule(trans),
9738                                                  NFT_TRANS_COMMIT);
9739
9740                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9741                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9742                         break;
9743                 case NFT_MSG_NEWSET:
9744                         if (nft_trans_set_update(trans)) {
9745                                 struct nft_set *set = nft_trans_set(trans);
9746
9747                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9748                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9749
9750                                 if (nft_trans_set_size(trans))
9751                                         WRITE_ONCE(set->size, nft_trans_set_size(trans));
9752                         } else {
9753                                 nft_clear(net, nft_trans_set(trans));
9754                                 /* This avoids hitting -EBUSY when deleting the table
9755                                  * from the transaction.
9756                                  */
9757                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9758                                     !list_empty(&nft_trans_set(trans)->bindings))
9759                                         nft_use_dec(&trans->ctx.table->use);
9760                         }
9761                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9762                                              NFT_MSG_NEWSET, GFP_KERNEL);
9763                         nft_trans_destroy(trans);
9764                         break;
9765                 case NFT_MSG_DELSET:
9766                 case NFT_MSG_DESTROYSET:
9767                         list_del_rcu(&nft_trans_set(trans)->list);
9768                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9769                                              trans->msg_type, GFP_KERNEL);
9770                         break;
9771                 case NFT_MSG_NEWSETELEM:
9772                         te = (struct nft_trans_elem *)trans->data;
9773
9774                         nft_setelem_activate(net, te->set, &te->elem);
9775                         nf_tables_setelem_notify(&trans->ctx, te->set,
9776                                                  &te->elem,
9777                                                  NFT_MSG_NEWSETELEM);
9778                         if (te->set->ops->commit &&
9779                             list_empty(&te->set->pending_update)) {
9780                                 list_add_tail(&te->set->pending_update,
9781                                               &set_update_list);
9782                         }
9783                         nft_trans_destroy(trans);
9784                         break;
9785                 case NFT_MSG_DELSETELEM:
9786                 case NFT_MSG_DESTROYSETELEM:
9787                         te = (struct nft_trans_elem *)trans->data;
9788
9789                         nf_tables_setelem_notify(&trans->ctx, te->set,
9790                                                  &te->elem,
9791                                                  trans->msg_type);
9792                         nft_setelem_remove(net, te->set, &te->elem);
9793                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9794                                 atomic_dec(&te->set->nelems);
9795                                 te->set->ndeact--;
9796                         }
9797                         if (te->set->ops->commit &&
9798                             list_empty(&te->set->pending_update)) {
9799                                 list_add_tail(&te->set->pending_update,
9800                                               &set_update_list);
9801                         }
9802                         break;
9803                 case NFT_MSG_NEWOBJ:
9804                         if (nft_trans_obj_update(trans)) {
9805                                 nft_obj_commit_update(trans);
9806                                 nf_tables_obj_notify(&trans->ctx,
9807                                                      nft_trans_obj(trans),
9808                                                      NFT_MSG_NEWOBJ);
9809                         } else {
9810                                 nft_clear(net, nft_trans_obj(trans));
9811                                 nf_tables_obj_notify(&trans->ctx,
9812                                                      nft_trans_obj(trans),
9813                                                      NFT_MSG_NEWOBJ);
9814                                 nft_trans_destroy(trans);
9815                         }
9816                         break;
9817                 case NFT_MSG_DELOBJ:
9818                 case NFT_MSG_DESTROYOBJ:
9819                         nft_obj_del(nft_trans_obj(trans));
9820                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9821                                              trans->msg_type);
9822                         break;
9823                 case NFT_MSG_NEWFLOWTABLE:
9824                         if (nft_trans_flowtable_update(trans)) {
9825                                 nft_trans_flowtable(trans)->data.flags =
9826                                         nft_trans_flowtable_flags(trans);
9827                                 nf_tables_flowtable_notify(&trans->ctx,
9828                                                            nft_trans_flowtable(trans),
9829                                                            &nft_trans_flowtable_hooks(trans),
9830                                                            NFT_MSG_NEWFLOWTABLE);
9831                                 list_splice(&nft_trans_flowtable_hooks(trans),
9832                                             &nft_trans_flowtable(trans)->hook_list);
9833                         } else {
9834                                 nft_clear(net, nft_trans_flowtable(trans));
9835                                 nf_tables_flowtable_notify(&trans->ctx,
9836                                                            nft_trans_flowtable(trans),
9837                                                            NULL,
9838                                                            NFT_MSG_NEWFLOWTABLE);
9839                         }
9840                         nft_trans_destroy(trans);
9841                         break;
9842                 case NFT_MSG_DELFLOWTABLE:
9843                 case NFT_MSG_DESTROYFLOWTABLE:
9844                         if (nft_trans_flowtable_update(trans)) {
9845                                 nf_tables_flowtable_notify(&trans->ctx,
9846                                                            nft_trans_flowtable(trans),
9847                                                            &nft_trans_flowtable_hooks(trans),
9848                                                            trans->msg_type);
9849                                 nft_unregister_flowtable_net_hooks(net,
9850                                                                    &nft_trans_flowtable_hooks(trans));
9851                         } else {
9852                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9853                                 nf_tables_flowtable_notify(&trans->ctx,
9854                                                            nft_trans_flowtable(trans),
9855                                                            NULL,
9856                                                            trans->msg_type);
9857                                 nft_unregister_flowtable_net_hooks(net,
9858                                                 &nft_trans_flowtable(trans)->hook_list);
9859                         }
9860                         break;
9861                 }
9862         }
9863
9864         nft_set_commit_update(&set_update_list);
9865
9866         nft_commit_notify(net, NETLINK_CB(skb).portid);
9867         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9868         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9869         nf_tables_commit_release(net);
9870
9871         return 0;
9872 }
9873
9874 static void nf_tables_module_autoload(struct net *net)
9875 {
9876         struct nftables_pernet *nft_net = nft_pernet(net);
9877         struct nft_module_request *req, *next;
9878         LIST_HEAD(module_list);
9879
9880         list_splice_init(&nft_net->module_list, &module_list);
9881         mutex_unlock(&nft_net->commit_mutex);
9882         list_for_each_entry_safe(req, next, &module_list, list) {
9883                 request_module("%s", req->module);
9884                 req->done = true;
9885         }
9886         mutex_lock(&nft_net->commit_mutex);
9887         list_splice(&module_list, &nft_net->module_list);
9888 }
9889
9890 static void nf_tables_abort_release(struct nft_trans *trans)
9891 {
9892         switch (trans->msg_type) {
9893         case NFT_MSG_NEWTABLE:
9894                 nf_tables_table_destroy(&trans->ctx);
9895                 break;
9896         case NFT_MSG_NEWCHAIN:
9897                 if (nft_trans_chain_update(trans))
9898                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9899                 else
9900                         nf_tables_chain_destroy(&trans->ctx);
9901                 break;
9902         case NFT_MSG_NEWRULE:
9903                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9904                 break;
9905         case NFT_MSG_NEWSET:
9906                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9907                 break;
9908         case NFT_MSG_NEWSETELEM:
9909                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9910                                      nft_trans_elem(trans).priv, true);
9911                 break;
9912         case NFT_MSG_NEWOBJ:
9913                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9914                 break;
9915         case NFT_MSG_NEWFLOWTABLE:
9916                 if (nft_trans_flowtable_update(trans))
9917                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9918                 else
9919                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9920                 break;
9921         }
9922         kfree(trans);
9923 }
9924
9925 static void nft_set_abort_update(struct list_head *set_update_list)
9926 {
9927         struct nft_set *set, *next;
9928
9929         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9930                 list_del_init(&set->pending_update);
9931
9932                 if (!set->ops->abort)
9933                         continue;
9934
9935                 set->ops->abort(set);
9936         }
9937 }
9938
9939 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9940 {
9941         struct nftables_pernet *nft_net = nft_pernet(net);
9942         struct nft_trans *trans, *next;
9943         LIST_HEAD(set_update_list);
9944         struct nft_trans_elem *te;
9945
9946         if (action == NFNL_ABORT_VALIDATE &&
9947             nf_tables_validate(net) < 0)
9948                 return -EAGAIN;
9949
9950         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9951                                          list) {
9952                 switch (trans->msg_type) {
9953                 case NFT_MSG_NEWTABLE:
9954                         if (nft_trans_table_update(trans)) {
9955                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9956                                         nft_trans_destroy(trans);
9957                                         break;
9958                                 }
9959                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9960                                         nf_tables_table_disable(net, trans->ctx.table);
9961                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9962                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9963                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9964                                 }
9965                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9966                                 nft_trans_destroy(trans);
9967                         } else {
9968                                 list_del_rcu(&trans->ctx.table->list);
9969                         }
9970                         break;
9971                 case NFT_MSG_DELTABLE:
9972                 case NFT_MSG_DESTROYTABLE:
9973                         nft_clear(trans->ctx.net, trans->ctx.table);
9974                         nft_trans_destroy(trans);
9975                         break;
9976                 case NFT_MSG_NEWCHAIN:
9977                         if (nft_trans_chain_update(trans)) {
9978                                 nft_netdev_unregister_hooks(net,
9979                                                             &nft_trans_chain_hooks(trans),
9980                                                             true);
9981                                 free_percpu(nft_trans_chain_stats(trans));
9982                                 kfree(nft_trans_chain_name(trans));
9983                                 nft_trans_destroy(trans);
9984                         } else {
9985                                 if (nft_trans_chain_bound(trans)) {
9986                                         nft_trans_destroy(trans);
9987                                         break;
9988                                 }
9989                                 nft_use_dec_restore(&trans->ctx.table->use);
9990                                 nft_chain_del(trans->ctx.chain);
9991                                 nf_tables_unregister_hook(trans->ctx.net,
9992                                                           trans->ctx.table,
9993                                                           trans->ctx.chain);
9994                         }
9995                         break;
9996                 case NFT_MSG_DELCHAIN:
9997                 case NFT_MSG_DESTROYCHAIN:
9998                         if (nft_trans_chain_update(trans)) {
9999                                 list_splice(&nft_trans_chain_hooks(trans),
10000                                             &nft_trans_basechain(trans)->hook_list);
10001                         } else {
10002                                 nft_use_inc_restore(&trans->ctx.table->use);
10003                                 nft_clear(trans->ctx.net, trans->ctx.chain);
10004                         }
10005                         nft_trans_destroy(trans);
10006                         break;
10007                 case NFT_MSG_NEWRULE:
10008                         if (nft_trans_rule_bound(trans)) {
10009                                 nft_trans_destroy(trans);
10010                                 break;
10011                         }
10012                         nft_use_dec_restore(&trans->ctx.chain->use);
10013                         list_del_rcu(&nft_trans_rule(trans)->list);
10014                         nft_rule_expr_deactivate(&trans->ctx,
10015                                                  nft_trans_rule(trans),
10016                                                  NFT_TRANS_ABORT);
10017                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10018                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10019                         break;
10020                 case NFT_MSG_DELRULE:
10021                 case NFT_MSG_DESTROYRULE:
10022                         nft_use_inc_restore(&trans->ctx.chain->use);
10023                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10024                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10025                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10026                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10027
10028                         nft_trans_destroy(trans);
10029                         break;
10030                 case NFT_MSG_NEWSET:
10031                         if (nft_trans_set_update(trans)) {
10032                                 nft_trans_destroy(trans);
10033                                 break;
10034                         }
10035                         nft_use_dec_restore(&trans->ctx.table->use);
10036                         if (nft_trans_set_bound(trans)) {
10037                                 nft_trans_destroy(trans);
10038                                 break;
10039                         }
10040                         list_del_rcu(&nft_trans_set(trans)->list);
10041                         break;
10042                 case NFT_MSG_DELSET:
10043                 case NFT_MSG_DESTROYSET:
10044                         nft_use_inc_restore(&trans->ctx.table->use);
10045                         nft_clear(trans->ctx.net, nft_trans_set(trans));
10046                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10047                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10048
10049                         nft_trans_destroy(trans);
10050                         break;
10051                 case NFT_MSG_NEWSETELEM:
10052                         if (nft_trans_elem_set_bound(trans)) {
10053                                 nft_trans_destroy(trans);
10054                                 break;
10055                         }
10056                         te = (struct nft_trans_elem *)trans->data;
10057                         nft_setelem_remove(net, te->set, &te->elem);
10058                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10059                                 atomic_dec(&te->set->nelems);
10060
10061                         if (te->set->ops->abort &&
10062                             list_empty(&te->set->pending_update)) {
10063                                 list_add_tail(&te->set->pending_update,
10064                                               &set_update_list);
10065                         }
10066                         break;
10067                 case NFT_MSG_DELSETELEM:
10068                 case NFT_MSG_DESTROYSETELEM:
10069                         te = (struct nft_trans_elem *)trans->data;
10070
10071                         nft_setelem_data_activate(net, te->set, &te->elem);
10072                         nft_setelem_activate(net, te->set, &te->elem);
10073                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10074                                 te->set->ndeact--;
10075
10076                         if (te->set->ops->abort &&
10077                             list_empty(&te->set->pending_update)) {
10078                                 list_add_tail(&te->set->pending_update,
10079                                               &set_update_list);
10080                         }
10081                         nft_trans_destroy(trans);
10082                         break;
10083                 case NFT_MSG_NEWOBJ:
10084                         if (nft_trans_obj_update(trans)) {
10085                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10086                                 nft_trans_destroy(trans);
10087                         } else {
10088                                 nft_use_dec_restore(&trans->ctx.table->use);
10089                                 nft_obj_del(nft_trans_obj(trans));
10090                         }
10091                         break;
10092                 case NFT_MSG_DELOBJ:
10093                 case NFT_MSG_DESTROYOBJ:
10094                         nft_use_inc_restore(&trans->ctx.table->use);
10095                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
10096                         nft_trans_destroy(trans);
10097                         break;
10098                 case NFT_MSG_NEWFLOWTABLE:
10099                         if (nft_trans_flowtable_update(trans)) {
10100                                 nft_unregister_flowtable_net_hooks(net,
10101                                                 &nft_trans_flowtable_hooks(trans));
10102                         } else {
10103                                 nft_use_dec_restore(&trans->ctx.table->use);
10104                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10105                                 nft_unregister_flowtable_net_hooks(net,
10106                                                 &nft_trans_flowtable(trans)->hook_list);
10107                         }
10108                         break;
10109                 case NFT_MSG_DELFLOWTABLE:
10110                 case NFT_MSG_DESTROYFLOWTABLE:
10111                         if (nft_trans_flowtable_update(trans)) {
10112                                 list_splice(&nft_trans_flowtable_hooks(trans),
10113                                             &nft_trans_flowtable(trans)->hook_list);
10114                         } else {
10115                                 nft_use_inc_restore(&trans->ctx.table->use);
10116                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10117                         }
10118                         nft_trans_destroy(trans);
10119                         break;
10120                 }
10121         }
10122
10123         nft_set_abort_update(&set_update_list);
10124
10125         synchronize_rcu();
10126
10127         list_for_each_entry_safe_reverse(trans, next,
10128                                          &nft_net->commit_list, list) {
10129                 nft_trans_list_del(trans);
10130                 nf_tables_abort_release(trans);
10131         }
10132
10133         if (action == NFNL_ABORT_AUTOLOAD)
10134                 nf_tables_module_autoload(net);
10135         else
10136                 nf_tables_module_autoload_cleanup(net);
10137
10138         return 0;
10139 }
10140
10141 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10142                            enum nfnl_abort_action action)
10143 {
10144         struct nftables_pernet *nft_net = nft_pernet(net);
10145         int ret = __nf_tables_abort(net, action);
10146
10147         mutex_unlock(&nft_net->commit_mutex);
10148
10149         return ret;
10150 }
10151
10152 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10153 {
10154         struct nftables_pernet *nft_net = nft_pernet(net);
10155         bool genid_ok;
10156
10157         mutex_lock(&nft_net->commit_mutex);
10158
10159         genid_ok = genid == 0 || nft_net->base_seq == genid;
10160         if (!genid_ok)
10161                 mutex_unlock(&nft_net->commit_mutex);
10162
10163         /* else, commit mutex has to be released by commit or abort function */
10164         return genid_ok;
10165 }
10166
10167 static const struct nfnetlink_subsystem nf_tables_subsys = {
10168         .name           = "nf_tables",
10169         .subsys_id      = NFNL_SUBSYS_NFTABLES,
10170         .cb_count       = NFT_MSG_MAX,
10171         .cb             = nf_tables_cb,
10172         .commit         = nf_tables_commit,
10173         .abort          = nf_tables_abort,
10174         .valid_genid    = nf_tables_valid_genid,
10175         .owner          = THIS_MODULE,
10176 };
10177
10178 int nft_chain_validate_dependency(const struct nft_chain *chain,
10179                                   enum nft_chain_types type)
10180 {
10181         const struct nft_base_chain *basechain;
10182
10183         if (nft_is_base_chain(chain)) {
10184                 basechain = nft_base_chain(chain);
10185                 if (basechain->type->type != type)
10186                         return -EOPNOTSUPP;
10187         }
10188         return 0;
10189 }
10190 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10191
10192 int nft_chain_validate_hooks(const struct nft_chain *chain,
10193                              unsigned int hook_flags)
10194 {
10195         struct nft_base_chain *basechain;
10196
10197         if (nft_is_base_chain(chain)) {
10198                 basechain = nft_base_chain(chain);
10199
10200                 if ((1 << basechain->ops.hooknum) & hook_flags)
10201                         return 0;
10202
10203                 return -EOPNOTSUPP;
10204         }
10205
10206         return 0;
10207 }
10208 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10209
10210 /*
10211  * Loop detection - walk through the ruleset beginning at the destination chain
10212  * of a new jump until either the source chain is reached (loop) or all
10213  * reachable chains have been traversed.
10214  *
10215  * The loop check is performed whenever a new jump verdict is added to an
10216  * expression or verdict map or a verdict map is bound to a new chain.
10217  */
10218
10219 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10220                                  const struct nft_chain *chain);
10221
10222 static int nft_check_loops(const struct nft_ctx *ctx,
10223                            const struct nft_set_ext *ext)
10224 {
10225         const struct nft_data *data;
10226         int ret;
10227
10228         data = nft_set_ext_data(ext);
10229         switch (data->verdict.code) {
10230         case NFT_JUMP:
10231         case NFT_GOTO:
10232                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10233                 break;
10234         default:
10235                 ret = 0;
10236                 break;
10237         }
10238
10239         return ret;
10240 }
10241
10242 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10243                                         struct nft_set *set,
10244                                         const struct nft_set_iter *iter,
10245                                         struct nft_set_elem *elem)
10246 {
10247         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10248
10249         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10250             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10251                 return 0;
10252
10253         return nft_check_loops(ctx, ext);
10254 }
10255
10256 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10257                                   struct nft_set *set)
10258 {
10259         u8 genmask = nft_genmask_next(ctx->net);
10260         struct nft_set_elem_catchall *catchall;
10261         struct nft_set_ext *ext;
10262         int ret = 0;
10263
10264         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10265                 ext = nft_set_elem_ext(set, catchall->elem);
10266                 if (!nft_set_elem_active(ext, genmask))
10267                         continue;
10268
10269                 ret = nft_check_loops(ctx, ext);
10270                 if (ret < 0)
10271                         return ret;
10272         }
10273
10274         return ret;
10275 }
10276
10277 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10278                                  const struct nft_chain *chain)
10279 {
10280         const struct nft_rule *rule;
10281         const struct nft_expr *expr, *last;
10282         struct nft_set *set;
10283         struct nft_set_binding *binding;
10284         struct nft_set_iter iter;
10285
10286         if (ctx->chain == chain)
10287                 return -ELOOP;
10288
10289         list_for_each_entry(rule, &chain->rules, list) {
10290                 nft_rule_for_each_expr(expr, last, rule) {
10291                         struct nft_immediate_expr *priv;
10292                         const struct nft_data *data;
10293                         int err;
10294
10295                         if (strcmp(expr->ops->type->name, "immediate"))
10296                                 continue;
10297
10298                         priv = nft_expr_priv(expr);
10299                         if (priv->dreg != NFT_REG_VERDICT)
10300                                 continue;
10301
10302                         data = &priv->data;
10303                         switch (data->verdict.code) {
10304                         case NFT_JUMP:
10305                         case NFT_GOTO:
10306                                 err = nf_tables_check_loops(ctx,
10307                                                         data->verdict.chain);
10308                                 if (err < 0)
10309                                         return err;
10310                                 break;
10311                         default:
10312                                 break;
10313                         }
10314                 }
10315         }
10316
10317         list_for_each_entry(set, &ctx->table->sets, list) {
10318                 if (!nft_is_active_next(ctx->net, set))
10319                         continue;
10320                 if (!(set->flags & NFT_SET_MAP) ||
10321                     set->dtype != NFT_DATA_VERDICT)
10322                         continue;
10323
10324                 list_for_each_entry(binding, &set->bindings, list) {
10325                         if (!(binding->flags & NFT_SET_MAP) ||
10326                             binding->chain != chain)
10327                                 continue;
10328
10329                         iter.genmask    = nft_genmask_next(ctx->net);
10330                         iter.skip       = 0;
10331                         iter.count      = 0;
10332                         iter.err        = 0;
10333                         iter.fn         = nf_tables_loop_check_setelem;
10334
10335                         set->ops->walk(ctx, set, &iter);
10336                         if (!iter.err)
10337                                 iter.err = nft_set_catchall_loops(ctx, set);
10338
10339                         if (iter.err < 0)
10340                                 return iter.err;
10341                 }
10342         }
10343
10344         return 0;
10345 }
10346
10347 /**
10348  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
10349  *
10350  *      @attr: netlink attribute to fetch value from
10351  *      @max: maximum value to be stored in dest
10352  *      @dest: pointer to the variable
10353  *
10354  *      Parse, check and store a given u32 netlink attribute into variable.
10355  *      This function returns -ERANGE if the value goes over maximum value.
10356  *      Otherwise a 0 is returned and the attribute value is stored in the
10357  *      destination variable.
10358  */
10359 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10360 {
10361         u32 val;
10362
10363         val = ntohl(nla_get_be32(attr));
10364         if (val > max)
10365                 return -ERANGE;
10366
10367         *dest = val;
10368         return 0;
10369 }
10370 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10371
10372 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10373 {
10374         unsigned int reg;
10375
10376         reg = ntohl(nla_get_be32(attr));
10377         switch (reg) {
10378         case NFT_REG_VERDICT...NFT_REG_4:
10379                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10380                 break;
10381         case NFT_REG32_00...NFT_REG32_15:
10382                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10383                 break;
10384         default:
10385                 return -ERANGE;
10386         }
10387
10388         return 0;
10389 }
10390
10391 /**
10392  *      nft_dump_register - dump a register value to a netlink attribute
10393  *
10394  *      @skb: socket buffer
10395  *      @attr: attribute number
10396  *      @reg: register number
10397  *
10398  *      Construct a netlink attribute containing the register number. For
10399  *      compatibility reasons, register numbers being a multiple of 4 are
10400  *      translated to the corresponding 128 bit register numbers.
10401  */
10402 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10403 {
10404         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10405                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10406         else
10407                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10408
10409         return nla_put_be32(skb, attr, htonl(reg));
10410 }
10411 EXPORT_SYMBOL_GPL(nft_dump_register);
10412
10413 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10414 {
10415         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10416                 return -EINVAL;
10417         if (len == 0)
10418                 return -EINVAL;
10419         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10420                 return -ERANGE;
10421
10422         return 0;
10423 }
10424
10425 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10426 {
10427         u32 reg;
10428         int err;
10429
10430         err = nft_parse_register(attr, &reg);
10431         if (err < 0)
10432                 return err;
10433
10434         err = nft_validate_register_load(reg, len);
10435         if (err < 0)
10436                 return err;
10437
10438         *sreg = reg;
10439         return 0;
10440 }
10441 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10442
10443 static int nft_validate_register_store(const struct nft_ctx *ctx,
10444                                        enum nft_registers reg,
10445                                        const struct nft_data *data,
10446                                        enum nft_data_types type,
10447                                        unsigned int len)
10448 {
10449         int err;
10450
10451         switch (reg) {
10452         case NFT_REG_VERDICT:
10453                 if (type != NFT_DATA_VERDICT)
10454                         return -EINVAL;
10455
10456                 if (data != NULL &&
10457                     (data->verdict.code == NFT_GOTO ||
10458                      data->verdict.code == NFT_JUMP)) {
10459                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10460                         if (err < 0)
10461                                 return err;
10462                 }
10463
10464                 return 0;
10465         default:
10466                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10467                         return -EINVAL;
10468                 if (len == 0)
10469                         return -EINVAL;
10470                 if (reg * NFT_REG32_SIZE + len >
10471                     sizeof_field(struct nft_regs, data))
10472                         return -ERANGE;
10473
10474                 if (data != NULL && type != NFT_DATA_VALUE)
10475                         return -EINVAL;
10476                 return 0;
10477         }
10478 }
10479
10480 int nft_parse_register_store(const struct nft_ctx *ctx,
10481                              const struct nlattr *attr, u8 *dreg,
10482                              const struct nft_data *data,
10483                              enum nft_data_types type, unsigned int len)
10484 {
10485         int err;
10486         u32 reg;
10487
10488         err = nft_parse_register(attr, &reg);
10489         if (err < 0)
10490                 return err;
10491
10492         err = nft_validate_register_store(ctx, reg, data, type, len);
10493         if (err < 0)
10494                 return err;
10495
10496         *dreg = reg;
10497         return 0;
10498 }
10499 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10500
10501 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10502         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10503         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10504                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10505         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10506 };
10507
10508 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10509                             struct nft_data_desc *desc, const struct nlattr *nla)
10510 {
10511         u8 genmask = nft_genmask_next(ctx->net);
10512         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10513         struct nft_chain *chain;
10514         int err;
10515
10516         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10517                                           nft_verdict_policy, NULL);
10518         if (err < 0)
10519                 return err;
10520
10521         if (!tb[NFTA_VERDICT_CODE])
10522                 return -EINVAL;
10523
10524         /* zero padding hole for memcmp */
10525         memset(data, 0, sizeof(*data));
10526         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10527
10528         switch (data->verdict.code) {
10529         default:
10530                 switch (data->verdict.code & NF_VERDICT_MASK) {
10531                 case NF_ACCEPT:
10532                 case NF_DROP:
10533                 case NF_QUEUE:
10534                         break;
10535                 default:
10536                         return -EINVAL;
10537                 }
10538                 fallthrough;
10539         case NFT_CONTINUE:
10540         case NFT_BREAK:
10541         case NFT_RETURN:
10542                 break;
10543         case NFT_JUMP:
10544         case NFT_GOTO:
10545                 if (tb[NFTA_VERDICT_CHAIN]) {
10546                         chain = nft_chain_lookup(ctx->net, ctx->table,
10547                                                  tb[NFTA_VERDICT_CHAIN],
10548                                                  genmask);
10549                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10550                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10551                                                       tb[NFTA_VERDICT_CHAIN_ID],
10552                                                       genmask);
10553                         if (IS_ERR(chain))
10554                                 return PTR_ERR(chain);
10555                 } else {
10556                         return -EINVAL;
10557                 }
10558
10559                 if (IS_ERR(chain))
10560                         return PTR_ERR(chain);
10561                 if (nft_is_base_chain(chain))
10562                         return -EOPNOTSUPP;
10563                 if (nft_chain_is_bound(chain))
10564                         return -EINVAL;
10565                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10566                     chain->flags & NFT_CHAIN_BINDING)
10567                         return -EINVAL;
10568                 if (!nft_use_inc(&chain->use))
10569                         return -EMFILE;
10570
10571                 data->verdict.chain = chain;
10572                 break;
10573         }
10574
10575         desc->len = sizeof(data->verdict);
10576
10577         return 0;
10578 }
10579
10580 static void nft_verdict_uninit(const struct nft_data *data)
10581 {
10582         struct nft_chain *chain;
10583
10584         switch (data->verdict.code) {
10585         case NFT_JUMP:
10586         case NFT_GOTO:
10587                 chain = data->verdict.chain;
10588                 nft_use_dec(&chain->use);
10589                 break;
10590         }
10591 }
10592
10593 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10594 {
10595         struct nlattr *nest;
10596
10597         nest = nla_nest_start_noflag(skb, type);
10598         if (!nest)
10599                 goto nla_put_failure;
10600
10601         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10602                 goto nla_put_failure;
10603
10604         switch (v->code) {
10605         case NFT_JUMP:
10606         case NFT_GOTO:
10607                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10608                                    v->chain->name))
10609                         goto nla_put_failure;
10610         }
10611         nla_nest_end(skb, nest);
10612         return 0;
10613
10614 nla_put_failure:
10615         return -1;
10616 }
10617
10618 static int nft_value_init(const struct nft_ctx *ctx,
10619                           struct nft_data *data, struct nft_data_desc *desc,
10620                           const struct nlattr *nla)
10621 {
10622         unsigned int len;
10623
10624         len = nla_len(nla);
10625         if (len == 0)
10626                 return -EINVAL;
10627         if (len > desc->size)
10628                 return -EOVERFLOW;
10629         if (desc->len) {
10630                 if (len != desc->len)
10631                         return -EINVAL;
10632         } else {
10633                 desc->len = len;
10634         }
10635
10636         nla_memcpy(data->data, nla, len);
10637
10638         return 0;
10639 }
10640
10641 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10642                           unsigned int len)
10643 {
10644         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10645 }
10646
10647 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10648         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10649         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10650 };
10651
10652 /**
10653  *      nft_data_init - parse nf_tables data netlink attributes
10654  *
10655  *      @ctx: context of the expression using the data
10656  *      @data: destination struct nft_data
10657  *      @desc: data description
10658  *      @nla: netlink attribute containing data
10659  *
10660  *      Parse the netlink data attributes and initialize a struct nft_data.
10661  *      The type and length of data are returned in the data description.
10662  *
10663  *      The caller can indicate that it only wants to accept data of type
10664  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10665  */
10666 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10667                   struct nft_data_desc *desc, const struct nlattr *nla)
10668 {
10669         struct nlattr *tb[NFTA_DATA_MAX + 1];
10670         int err;
10671
10672         if (WARN_ON_ONCE(!desc->size))
10673                 return -EINVAL;
10674
10675         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10676                                           nft_data_policy, NULL);
10677         if (err < 0)
10678                 return err;
10679
10680         if (tb[NFTA_DATA_VALUE]) {
10681                 if (desc->type != NFT_DATA_VALUE)
10682                         return -EINVAL;
10683
10684                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10685         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10686                 if (desc->type != NFT_DATA_VERDICT)
10687                         return -EINVAL;
10688
10689                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10690         } else {
10691                 err = -EINVAL;
10692         }
10693
10694         return err;
10695 }
10696 EXPORT_SYMBOL_GPL(nft_data_init);
10697
10698 /**
10699  *      nft_data_release - release a nft_data item
10700  *
10701  *      @data: struct nft_data to release
10702  *      @type: type of data
10703  *
10704  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10705  *      all others need to be released by calling this function.
10706  */
10707 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10708 {
10709         if (type < NFT_DATA_VERDICT)
10710                 return;
10711         switch (type) {
10712         case NFT_DATA_VERDICT:
10713                 return nft_verdict_uninit(data);
10714         default:
10715                 WARN_ON(1);
10716         }
10717 }
10718 EXPORT_SYMBOL_GPL(nft_data_release);
10719
10720 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10721                   enum nft_data_types type, unsigned int len)
10722 {
10723         struct nlattr *nest;
10724         int err;
10725
10726         nest = nla_nest_start_noflag(skb, attr);
10727         if (nest == NULL)
10728                 return -1;
10729
10730         switch (type) {
10731         case NFT_DATA_VALUE:
10732                 err = nft_value_dump(skb, data, len);
10733                 break;
10734         case NFT_DATA_VERDICT:
10735                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10736                 break;
10737         default:
10738                 err = -EINVAL;
10739                 WARN_ON(1);
10740         }
10741
10742         nla_nest_end(skb, nest);
10743         return err;
10744 }
10745 EXPORT_SYMBOL_GPL(nft_data_dump);
10746
10747 int __nft_release_basechain(struct nft_ctx *ctx)
10748 {
10749         struct nft_rule *rule, *nr;
10750
10751         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10752                 return 0;
10753
10754         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10755         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10756                 list_del(&rule->list);
10757                 nft_use_dec(&ctx->chain->use);
10758                 nf_tables_rule_release(ctx, rule);
10759         }
10760         nft_chain_del(ctx->chain);
10761         nft_use_dec(&ctx->table->use);
10762         nf_tables_chain_destroy(ctx);
10763
10764         return 0;
10765 }
10766 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10767
10768 static void __nft_release_hook(struct net *net, struct nft_table *table)
10769 {
10770         struct nft_flowtable *flowtable;
10771         struct nft_chain *chain;
10772
10773         list_for_each_entry(chain, &table->chains, list)
10774                 __nf_tables_unregister_hook(net, table, chain, true);
10775         list_for_each_entry(flowtable, &table->flowtables, list)
10776                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10777                                                      true);
10778 }
10779
10780 static void __nft_release_hooks(struct net *net)
10781 {
10782         struct nftables_pernet *nft_net = nft_pernet(net);
10783         struct nft_table *table;
10784
10785         list_for_each_entry(table, &nft_net->tables, list) {
10786                 if (nft_table_has_owner(table))
10787                         continue;
10788
10789                 __nft_release_hook(net, table);
10790         }
10791 }
10792
10793 static void __nft_release_table(struct net *net, struct nft_table *table)
10794 {
10795         struct nft_flowtable *flowtable, *nf;
10796         struct nft_chain *chain, *nc;
10797         struct nft_object *obj, *ne;
10798         struct nft_rule *rule, *nr;
10799         struct nft_set *set, *ns;
10800         struct nft_ctx ctx = {
10801                 .net    = net,
10802                 .family = NFPROTO_NETDEV,
10803         };
10804
10805         ctx.family = table->family;
10806         ctx.table = table;
10807         list_for_each_entry(chain, &table->chains, list) {
10808                 if (nft_chain_is_bound(chain))
10809                         continue;
10810
10811                 ctx.chain = chain;
10812                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10813                         list_del(&rule->list);
10814                         nft_use_dec(&chain->use);
10815                         nf_tables_rule_release(&ctx, rule);
10816                 }
10817         }
10818         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10819                 list_del(&flowtable->list);
10820                 nft_use_dec(&table->use);
10821                 nf_tables_flowtable_destroy(flowtable);
10822         }
10823         list_for_each_entry_safe(set, ns, &table->sets, list) {
10824                 list_del(&set->list);
10825                 nft_use_dec(&table->use);
10826                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10827                         nft_map_deactivate(&ctx, set);
10828
10829                 nft_set_destroy(&ctx, set);
10830         }
10831         list_for_each_entry_safe(obj, ne, &table->objects, list) {
10832                 nft_obj_del(obj);
10833                 nft_use_dec(&table->use);
10834                 nft_obj_destroy(&ctx, obj);
10835         }
10836         list_for_each_entry_safe(chain, nc, &table->chains, list) {
10837                 ctx.chain = chain;
10838                 nft_chain_del(chain);
10839                 nft_use_dec(&table->use);
10840                 nf_tables_chain_destroy(&ctx);
10841         }
10842         nf_tables_table_destroy(&ctx);
10843 }
10844
10845 static void __nft_release_tables(struct net *net)
10846 {
10847         struct nftables_pernet *nft_net = nft_pernet(net);
10848         struct nft_table *table, *nt;
10849
10850         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10851                 if (nft_table_has_owner(table))
10852                         continue;
10853
10854                 list_del(&table->list);
10855
10856                 __nft_release_table(net, table);
10857         }
10858 }
10859
10860 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10861                             void *ptr)
10862 {
10863         struct nft_table *table, *to_delete[8];
10864         struct nftables_pernet *nft_net;
10865         struct netlink_notify *n = ptr;
10866         struct net *net = n->net;
10867         unsigned int deleted;
10868         bool restart = false;
10869
10870         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10871                 return NOTIFY_DONE;
10872
10873         nft_net = nft_pernet(net);
10874         deleted = 0;
10875         mutex_lock(&nft_net->commit_mutex);
10876         if (!list_empty(&nf_tables_destroy_list))
10877                 rcu_barrier();
10878 again:
10879         list_for_each_entry(table, &nft_net->tables, list) {
10880                 if (nft_table_has_owner(table) &&
10881                     n->portid == table->nlpid) {
10882                         __nft_release_hook(net, table);
10883                         list_del_rcu(&table->list);
10884                         to_delete[deleted++] = table;
10885                         if (deleted >= ARRAY_SIZE(to_delete))
10886                                 break;
10887                 }
10888         }
10889         if (deleted) {
10890                 restart = deleted >= ARRAY_SIZE(to_delete);
10891                 synchronize_rcu();
10892                 while (deleted)
10893                         __nft_release_table(net, to_delete[--deleted]);
10894
10895                 if (restart)
10896                         goto again;
10897         }
10898         mutex_unlock(&nft_net->commit_mutex);
10899
10900         return NOTIFY_DONE;
10901 }
10902
10903 static struct notifier_block nft_nl_notifier = {
10904         .notifier_call  = nft_rcv_nl_event,
10905 };
10906
10907 static int __net_init nf_tables_init_net(struct net *net)
10908 {
10909         struct nftables_pernet *nft_net = nft_pernet(net);
10910
10911         INIT_LIST_HEAD(&nft_net->tables);
10912         INIT_LIST_HEAD(&nft_net->commit_list);
10913         INIT_LIST_HEAD(&nft_net->binding_list);
10914         INIT_LIST_HEAD(&nft_net->module_list);
10915         INIT_LIST_HEAD(&nft_net->notify_list);
10916         mutex_init(&nft_net->commit_mutex);
10917         nft_net->base_seq = 1;
10918
10919         return 0;
10920 }
10921
10922 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10923 {
10924         struct nftables_pernet *nft_net = nft_pernet(net);
10925
10926         mutex_lock(&nft_net->commit_mutex);
10927         __nft_release_hooks(net);
10928         mutex_unlock(&nft_net->commit_mutex);
10929 }
10930
10931 static void __net_exit nf_tables_exit_net(struct net *net)
10932 {
10933         struct nftables_pernet *nft_net = nft_pernet(net);
10934
10935         mutex_lock(&nft_net->commit_mutex);
10936         if (!list_empty(&nft_net->commit_list) ||
10937             !list_empty(&nft_net->module_list))
10938                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10939         __nft_release_tables(net);
10940         mutex_unlock(&nft_net->commit_mutex);
10941         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10942         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10943         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10944 }
10945
10946 static struct pernet_operations nf_tables_net_ops = {
10947         .init           = nf_tables_init_net,
10948         .pre_exit       = nf_tables_pre_exit_net,
10949         .exit           = nf_tables_exit_net,
10950         .id             = &nf_tables_net_id,
10951         .size           = sizeof(struct nftables_pernet),
10952 };
10953
10954 static int __init nf_tables_module_init(void)
10955 {
10956         int err;
10957
10958         err = register_pernet_subsys(&nf_tables_net_ops);
10959         if (err < 0)
10960                 return err;
10961
10962         err = nft_chain_filter_init();
10963         if (err < 0)
10964                 goto err_chain_filter;
10965
10966         err = nf_tables_core_module_init();
10967         if (err < 0)
10968                 goto err_core_module;
10969
10970         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10971         if (err < 0)
10972                 goto err_netdev_notifier;
10973
10974         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10975         if (err < 0)
10976                 goto err_rht_objname;
10977
10978         err = nft_offload_init();
10979         if (err < 0)
10980                 goto err_offload;
10981
10982         err = netlink_register_notifier(&nft_nl_notifier);
10983         if (err < 0)
10984                 goto err_netlink_notifier;
10985
10986         /* must be last */
10987         err = nfnetlink_subsys_register(&nf_tables_subsys);
10988         if (err < 0)
10989                 goto err_nfnl_subsys;
10990
10991         nft_chain_route_init();
10992
10993         return err;
10994
10995 err_nfnl_subsys:
10996         netlink_unregister_notifier(&nft_nl_notifier);
10997 err_netlink_notifier:
10998         nft_offload_exit();
10999 err_offload:
11000         rhltable_destroy(&nft_objname_ht);
11001 err_rht_objname:
11002         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11003 err_netdev_notifier:
11004         nf_tables_core_module_exit();
11005 err_core_module:
11006         nft_chain_filter_fini();
11007 err_chain_filter:
11008         unregister_pernet_subsys(&nf_tables_net_ops);
11009         return err;
11010 }
11011
11012 static void __exit nf_tables_module_exit(void)
11013 {
11014         nfnetlink_subsys_unregister(&nf_tables_subsys);
11015         netlink_unregister_notifier(&nft_nl_notifier);
11016         nft_offload_exit();
11017         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11018         nft_chain_filter_fini();
11019         nft_chain_route_fini();
11020         unregister_pernet_subsys(&nf_tables_net_ops);
11021         cancel_work_sync(&trans_destroy_work);
11022         rcu_barrier();
11023         rhltable_destroy(&nft_objname_ht);
11024         nf_tables_core_module_exit();
11025 }
11026
11027 module_init(nf_tables_module_init);
11028 module_exit(nf_tables_module_exit);
11029
11030 MODULE_LICENSE("GPL");
11031 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11032 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);