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