net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35
  36 enum {
  37         NFT_VALIDATE_SKIP       = 0,
  38         NFT_VALIDATE_NEED,
  39         NFT_VALIDATE_DO,
  40 };
  41
  42 static struct rhltable nft_objname_ht;
  43
  44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  47
  48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  51
  52 static const struct rhashtable_params nft_chain_ht_params = {
  53         .head_offset            = offsetof(struct nft_chain, rhlhead),
  54         .key_offset             = offsetof(struct nft_chain, name),
  55         .hashfn                 = nft_chain_hash,
  56         .obj_hashfn             = nft_chain_hash_obj,
  57         .obj_cmpfn              = nft_chain_hash_cmp,
  58         .automatic_shrinking    = true,
  59 };
  60
  61 static const struct rhashtable_params nft_objname_ht_params = {
  62         .head_offset            = offsetof(struct nft_object, rhlhead),
  63         .key_offset             = offsetof(struct nft_object, key),
  64         .hashfn                 = nft_objname_hash,
  65         .obj_hashfn             = nft_objname_hash_obj,
  66         .obj_cmpfn              = nft_objname_hash_cmp,
  67         .automatic_shrinking    = true,
  68 };
  69
  70 struct nft_audit_data {
  71         struct nft_table *table;
  72         int entries;
  73         int op;
  74         struct list_head list;
  75 };
  76
  77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  78         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  79         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  80         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  81         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  82         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  84         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  85         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  87         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  88         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  90         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  91         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  93         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  94         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  97         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
  99         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 100         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 101         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 102         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 103 };
 104
 105 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
 106 {
 107         struct nftables_pernet *nft_net = nft_pernet(net);
 108
 109         switch (nft_net->validate_state) {
 110         case NFT_VALIDATE_SKIP:
 111                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 112                 break;
 113         case NFT_VALIDATE_NEED:
 114                 break;
 115         case NFT_VALIDATE_DO:
 116                 if (new_validate_state == NFT_VALIDATE_NEED)
 117                         return;
 118         }
 119
 120         nft_net->validate_state = new_validate_state;
 121 }
 122 static void nf_tables_trans_destroy_work(struct work_struct *w);
 123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 124
 125 static void nft_ctx_init(struct nft_ctx *ctx,
 126                          struct net *net,
 127                          const struct sk_buff *skb,
 128                          const struct nlmsghdr *nlh,
 129                          u8 family,
 130                          struct nft_table *table,
 131                          struct nft_chain *chain,
 132                          const struct nlattr * const *nla)
 133 {
 134         ctx->net        = net;
 135         ctx->family     = family;
 136         ctx->level      = 0;
 137         ctx->table      = table;
 138         ctx->chain      = chain;
 139         ctx->nla        = nla;
 140         ctx->portid     = NETLINK_CB(skb).portid;
 141         ctx->report     = nlmsg_report(nlh);
 142         ctx->flags      = nlh->nlmsg_flags;
 143         ctx->seq        = nlh->nlmsg_seq;
 144 }
 145
 146 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 147                                              int msg_type, u32 size, gfp_t gfp)
 148 {
 149         struct nft_trans *trans;
 150
 151         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 152         if (trans == NULL)
 153                 return NULL;
 154
 155         INIT_LIST_HEAD(&trans->list);
 156         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                                const struct nft_set_desc *desc)
 471 {
 472         struct nft_trans *trans;
 473
 474         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 475         if (trans == NULL)
 476                 return -ENOMEM;
 477
 478         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 479                 nft_trans_set_id(trans) =
 480                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 481                 nft_activate_next(ctx->net, set);
 482         }
 483         nft_trans_set(trans) = set;
 484         if (desc) {
 485                 nft_trans_set_update(trans) = true;
 486                 nft_trans_set_gc_int(trans) = desc->gc_int;
 487                 nft_trans_set_timeout(trans) = desc->timeout;
 488         }
 489         nft_trans_commit_list_add_tail(ctx->net, trans);
 490
 491         return 0;
 492 }
 493
 494 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 495                              struct nft_set *set)
 496 {
 497         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 498 }
 499
 500 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 501 {
 502         int err;
 503
 504         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 505         if (err < 0)
 506                 return err;
 507
 508         nft_deactivate_next(ctx->net, set);
 509         ctx->table->use--;
 510
 511         return err;
 512 }
 513
 514 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 515                              struct nft_object *obj)
 516 {
 517         struct nft_trans *trans;
 518
 519         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 520         if (trans == NULL)
 521                 return -ENOMEM;
 522
 523         if (msg_type == NFT_MSG_NEWOBJ)
 524                 nft_activate_next(ctx->net, obj);
 525
 526         nft_trans_obj(trans) = obj;
 527         nft_trans_commit_list_add_tail(ctx->net, trans);
 528
 529         return 0;
 530 }
 531
 532 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 533 {
 534         int err;
 535
 536         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 537         if (err < 0)
 538                 return err;
 539
 540         nft_deactivate_next(ctx->net, obj);
 541         ctx->table->use--;
 542
 543         return err;
 544 }
 545
 546 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 547                                    struct nft_flowtable *flowtable)
 548 {
 549         struct nft_trans *trans;
 550
 551         trans = nft_trans_alloc(ctx, msg_type,
 552                                 sizeof(struct nft_trans_flowtable));
 553         if (trans == NULL)
 554                 return -ENOMEM;
 555
 556         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 557                 nft_activate_next(ctx->net, flowtable);
 558
 559         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 560         nft_trans_flowtable(trans) = flowtable;
 561         nft_trans_commit_list_add_tail(ctx->net, trans);
 562
 563         return 0;
 564 }
 565
 566 static int nft_delflowtable(struct nft_ctx *ctx,
 567                             struct nft_flowtable *flowtable)
 568 {
 569         int err;
 570
 571         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 572         if (err < 0)
 573                 return err;
 574
 575         nft_deactivate_next(ctx->net, flowtable);
 576         ctx->table->use--;
 577
 578         return err;
 579 }
 580
 581 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 582 {
 583         int i;
 584
 585         for (i = track->regs[dreg].num_reg; i > 0; i--)
 586                 __nft_reg_track_cancel(track, dreg - i);
 587 }
 588
 589 static void __nft_reg_track_update(struct nft_regs_track *track,
 590                                    const struct nft_expr *expr,
 591                                    u8 dreg, u8 num_reg)
 592 {
 593         track->regs[dreg].selector = expr;
 594         track->regs[dreg].bitwise = NULL;
 595         track->regs[dreg].num_reg = num_reg;
 596 }
 597
 598 void nft_reg_track_update(struct nft_regs_track *track,
 599                           const struct nft_expr *expr, u8 dreg, u8 len)
 600 {
 601         unsigned int regcount;
 602         int i;
 603
 604         __nft_reg_track_clobber(track, dreg);
 605
 606         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 607         for (i = 0; i < regcount; i++, dreg++)
 608                 __nft_reg_track_update(track, expr, dreg, i);
 609 }
 610 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 611
 612 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 613 {
 614         unsigned int regcount;
 615         int i;
 616
 617         __nft_reg_track_clobber(track, dreg);
 618
 619         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 620         for (i = 0; i < regcount; i++, dreg++)
 621                 __nft_reg_track_cancel(track, dreg);
 622 }
 623 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 624
 625 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 626 {
 627         track->regs[dreg].selector = NULL;
 628         track->regs[dreg].bitwise = NULL;
 629         track->regs[dreg].num_reg = 0;
 630 }
 631 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 632
 633 /*
 634  * Tables
 635  */
 636
 637 static struct nft_table *nft_table_lookup(const struct net *net,
 638                                           const struct nlattr *nla,
 639                                           u8 family, u8 genmask, u32 nlpid)
 640 {
 641         struct nftables_pernet *nft_net;
 642         struct nft_table *table;
 643
 644         if (nla == NULL)
 645                 return ERR_PTR(-EINVAL);
 646
 647         nft_net = nft_pernet(net);
 648         list_for_each_entry_rcu(table, &nft_net->tables, list,
 649                                 lockdep_is_held(&nft_net->commit_mutex)) {
 650                 if (!nla_strcmp(nla, table->name) &&
 651                     table->family == family &&
 652                     nft_active_genmask(table, genmask)) {
 653                         if (nft_table_has_owner(table) &&
 654                             nlpid && table->nlpid != nlpid)
 655                                 return ERR_PTR(-EPERM);
 656
 657                         return table;
 658                 }
 659         }
 660
 661         return ERR_PTR(-ENOENT);
 662 }
 663
 664 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 665                                                    const struct nlattr *nla,
 666                                                    u8 genmask, u32 nlpid)
 667 {
 668         struct nftables_pernet *nft_net;
 669         struct nft_table *table;
 670
 671         nft_net = nft_pernet(net);
 672         list_for_each_entry(table, &nft_net->tables, list) {
 673                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 674                     nft_active_genmask(table, genmask)) {
 675                         if (nft_table_has_owner(table) &&
 676                             nlpid && table->nlpid != nlpid)
 677                                 return ERR_PTR(-EPERM);
 678
 679                         return table;
 680                 }
 681         }
 682
 683         return ERR_PTR(-ENOENT);
 684 }
 685
 686 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 687 {
 688         return ++table->hgenerator;
 689 }
 690
 691 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 692
 693 static const struct nft_chain_type *
 694 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 695 {
 696         if (family >= NFPROTO_NUMPROTO ||
 697             type >= NFT_CHAIN_T_MAX)
 698                 return NULL;
 699
 700         return chain_type[family][type];
 701 }
 702
 703 static const struct nft_chain_type *
 704 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 705 {
 706         const struct nft_chain_type *type;
 707         int i;
 708
 709         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 710                 type = __nft_chain_type_get(family, i);
 711                 if (!type)
 712                         continue;
 713                 if (!nla_strcmp(nla, type->name))
 714                         return type;
 715         }
 716         return NULL;
 717 }
 718
 719 struct nft_module_request {
 720         struct list_head        list;
 721         char                    module[MODULE_NAME_LEN];
 722         bool                    done;
 723 };
 724
 725 #ifdef CONFIG_MODULES
 726 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 727                                       ...)
 728 {
 729         char module_name[MODULE_NAME_LEN];
 730         struct nftables_pernet *nft_net;
 731         struct nft_module_request *req;
 732         va_list args;
 733         int ret;
 734
 735         va_start(args, fmt);
 736         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 737         va_end(args);
 738         if (ret >= MODULE_NAME_LEN)
 739                 return 0;
 740
 741         nft_net = nft_pernet(net);
 742         list_for_each_entry(req, &nft_net->module_list, list) {
 743                 if (!strcmp(req->module, module_name)) {
 744                         if (req->done)
 745                                 return 0;
 746
 747                         /* A request to load this module already exists. */
 748                         return -EAGAIN;
 749                 }
 750         }
 751
 752         req = kmalloc(sizeof(*req), GFP_KERNEL);
 753         if (!req)
 754                 return -ENOMEM;
 755
 756         req->done = false;
 757         strscpy(req->module, module_name, MODULE_NAME_LEN);
 758         list_add_tail(&req->list, &nft_net->module_list);
 759
 760         return -EAGAIN;
 761 }
 762 EXPORT_SYMBOL_GPL(nft_request_module);
 763 #endif
 764
 765 static void lockdep_nfnl_nft_mutex_not_held(void)
 766 {
 767 #ifdef CONFIG_PROVE_LOCKING
 768         if (debug_locks)
 769                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 770 #endif
 771 }
 772
 773 static const struct nft_chain_type *
 774 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 775                             u8 family, bool autoload)
 776 {
 777         const struct nft_chain_type *type;
 778
 779         type = __nf_tables_chain_type_lookup(nla, family);
 780         if (type != NULL)
 781                 return type;
 782
 783         lockdep_nfnl_nft_mutex_not_held();
 784 #ifdef CONFIG_MODULES
 785         if (autoload) {
 786                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 787                                        nla_len(nla),
 788                                        (const char *)nla_data(nla)) == -EAGAIN)
 789                         return ERR_PTR(-EAGAIN);
 790         }
 791 #endif
 792         return ERR_PTR(-ENOENT);
 793 }
 794
 795 static __be16 nft_base_seq(const struct net *net)
 796 {
 797         struct nftables_pernet *nft_net = nft_pernet(net);
 798
 799         return htons(nft_net->base_seq & 0xffff);
 800 }
 801
 802 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 803         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 804                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 805         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 806         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 807         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 808                                     .len = NFT_USERDATA_MAXLEN }
 809 };
 810
 811 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 812                                      u32 portid, u32 seq, int event, u32 flags,
 813                                      int family, const struct nft_table *table)
 814 {
 815         struct nlmsghdr *nlh;
 816
 817         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 818         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 819                            NFNETLINK_V0, nft_base_seq(net));
 820         if (!nlh)
 821                 goto nla_put_failure;
 822
 823         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 824             nla_put_be32(skb, NFTA_TABLE_FLAGS,
 825                          htonl(table->flags & NFT_TABLE_F_MASK)) ||
 826             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 827             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 828                          NFTA_TABLE_PAD))
 829                 goto nla_put_failure;
 830         if (nft_table_has_owner(table) &&
 831             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 832                 goto nla_put_failure;
 833
 834         if (table->udata) {
 835                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 836                         goto nla_put_failure;
 837         }
 838
 839         nlmsg_end(skb, nlh);
 840         return 0;
 841
 842 nla_put_failure:
 843         nlmsg_trim(skb, nlh);
 844         return -1;
 845 }
 846
 847 struct nftnl_skb_parms {
 848         bool report;
 849 };
 850 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 851
 852 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 853                                struct list_head *notify_list)
 854 {
 855         NFT_CB(skb).report = report;
 856         list_add_tail(&skb->list, notify_list);
 857 }
 858
 859 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 860 {
 861         struct nftables_pernet *nft_net;
 862         struct sk_buff *skb;
 863         u16 flags = 0;
 864         int err;
 865
 866         if (!ctx->report &&
 867             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 868                 return;
 869
 870         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 871         if (skb == NULL)
 872                 goto err;
 873
 874         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 875                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 876
 877         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 878                                         event, flags, ctx->family, ctx->table);
 879         if (err < 0) {
 880                 kfree_skb(skb);
 881                 goto err;
 882         }
 883
 884         nft_net = nft_pernet(ctx->net);
 885         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 886         return;
 887 err:
 888         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 889 }
 890
 891 static int nf_tables_dump_tables(struct sk_buff *skb,
 892                                  struct netlink_callback *cb)
 893 {
 894         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 895         struct nftables_pernet *nft_net;
 896         const struct nft_table *table;
 897         unsigned int idx = 0, s_idx = cb->args[0];
 898         struct net *net = sock_net(skb->sk);
 899         int family = nfmsg->nfgen_family;
 900
 901         rcu_read_lock();
 902         nft_net = nft_pernet(net);
 903         cb->seq = READ_ONCE(nft_net->base_seq);
 904
 905         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 906                 if (family != NFPROTO_UNSPEC && family != table->family)
 907                         continue;
 908
 909                 if (idx < s_idx)
 910                         goto cont;
 911                 if (idx > s_idx)
 912                         memset(&cb->args[1], 0,
 913                                sizeof(cb->args) - sizeof(cb->args[0]));
 914                 if (!nft_is_active(net, table))
 915                         continue;
 916                 if (nf_tables_fill_table_info(skb, net,
 917                                               NETLINK_CB(cb->skb).portid,
 918                                               cb->nlh->nlmsg_seq,
 919                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 920                                               table->family, table) < 0)
 921                         goto done;
 922
 923                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 924 cont:
 925                 idx++;
 926         }
 927 done:
 928         rcu_read_unlock();
 929         cb->args[0] = idx;
 930         return skb->len;
 931 }
 932
 933 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 934                                       const struct nlmsghdr *nlh,
 935                                       struct netlink_dump_control *c)
 936 {
 937         int err;
 938
 939         if (!try_module_get(THIS_MODULE))
 940                 return -EINVAL;
 941
 942         rcu_read_unlock();
 943         err = netlink_dump_start(nlsk, skb, nlh, c);
 944         rcu_read_lock();
 945         module_put(THIS_MODULE);
 946
 947         return err;
 948 }
 949
 950 /* called with rcu_read_lock held */
 951 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 952                               const struct nlattr * const nla[])
 953 {
 954         struct netlink_ext_ack *extack = info->extack;
 955         u8 genmask = nft_genmask_cur(info->net);
 956         u8 family = info->nfmsg->nfgen_family;
 957         const struct nft_table *table;
 958         struct net *net = info->net;
 959         struct sk_buff *skb2;
 960         int err;
 961
 962         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 963                 struct netlink_dump_control c = {
 964                         .dump = nf_tables_dump_tables,
 965                         .module = THIS_MODULE,
 966                 };
 967
 968                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 969         }
 970
 971         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 972         if (IS_ERR(table)) {
 973                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 974                 return PTR_ERR(table);
 975         }
 976
 977         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 978         if (!skb2)
 979                 return -ENOMEM;
 980
 981         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 982                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 983                                         0, family, table);
 984         if (err < 0)
 985                 goto err_fill_table_info;
 986
 987         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 988
 989 err_fill_table_info:
 990         kfree_skb(skb2);
 991         return err;
 992 }
 993
 994 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 995 {
 996         struct nft_chain *chain;
 997         u32 i = 0;
 998
 999         list_for_each_entry(chain, &table->chains, list) {
1000                 if (!nft_is_active_next(net, chain))
1001                         continue;
1002                 if (!nft_is_base_chain(chain))
1003                         continue;
1004
1005                 if (cnt && i++ == cnt)
1006                         break;
1007
1008                 nf_tables_unregister_hook(net, table, chain);
1009         }
1010 }
1011
1012 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1013 {
1014         struct nft_chain *chain;
1015         int err, i = 0;
1016
1017         list_for_each_entry(chain, &table->chains, list) {
1018                 if (!nft_is_active_next(net, chain))
1019                         continue;
1020                 if (!nft_is_base_chain(chain))
1021                         continue;
1022
1023                 err = nf_tables_register_hook(net, table, chain);
1024                 if (err < 0)
1025                         goto err_register_hooks;
1026
1027                 i++;
1028         }
1029         return 0;
1030
1031 err_register_hooks:
1032         if (i)
1033                 nft_table_disable(net, table, i);
1034         return err;
1035 }
1036
1037 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1038 {
1039         table->flags &= ~NFT_TABLE_F_DORMANT;
1040         nft_table_disable(net, table, 0);
1041         table->flags |= NFT_TABLE_F_DORMANT;
1042 }
1043
1044 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1045 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1046 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1047 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1048                                          __NFT_TABLE_F_WAS_AWAKEN)
1049
1050 static int nf_tables_updtable(struct nft_ctx *ctx)
1051 {
1052         struct nft_trans *trans;
1053         u32 flags;
1054         int ret;
1055
1056         if (!ctx->nla[NFTA_TABLE_FLAGS])
1057                 return 0;
1058
1059         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1060         if (flags & ~NFT_TABLE_F_MASK)
1061                 return -EOPNOTSUPP;
1062
1063         if (flags == ctx->table->flags)
1064                 return 0;
1065
1066         if ((nft_table_has_owner(ctx->table) &&
1067              !(flags & NFT_TABLE_F_OWNER)) ||
1068             (!nft_table_has_owner(ctx->table) &&
1069              flags & NFT_TABLE_F_OWNER))
1070                 return -EOPNOTSUPP;
1071
1072         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1073                                 sizeof(struct nft_trans_table));
1074         if (trans == NULL)
1075                 return -ENOMEM;
1076
1077         if ((flags & NFT_TABLE_F_DORMANT) &&
1078             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1079                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1080                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1081                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1082         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1083                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1084                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1085                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1086                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1087                         if (ret < 0)
1088                                 goto err_register_hooks;
1089
1090                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1091                 }
1092         }
1093
1094         nft_trans_table_update(trans) = true;
1095         nft_trans_commit_list_add_tail(ctx->net, trans);
1096
1097         return 0;
1098
1099 err_register_hooks:
1100         nft_trans_destroy(trans);
1101         return ret;
1102 }
1103
1104 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1105 {
1106         const char *name = data;
1107
1108         return jhash(name, strlen(name), seed);
1109 }
1110
1111 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1112 {
1113         const struct nft_chain *chain = data;
1114
1115         return nft_chain_hash(chain->name, 0, seed);
1116 }
1117
1118 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1119                               const void *ptr)
1120 {
1121         const struct nft_chain *chain = ptr;
1122         const char *name = arg->key;
1123
1124         return strcmp(chain->name, name);
1125 }
1126
1127 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1128 {
1129         const struct nft_object_hash_key *k = data;
1130
1131         seed ^= hash_ptr(k->table, 32);
1132
1133         return jhash(k->name, strlen(k->name), seed);
1134 }
1135
1136 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1137 {
1138         const struct nft_object *obj = data;
1139
1140         return nft_objname_hash(&obj->key, 0, seed);
1141 }
1142
1143 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1144                                 const void *ptr)
1145 {
1146         const struct nft_object_hash_key *k = arg->key;
1147         const struct nft_object *obj = ptr;
1148
1149         if (obj->key.table != k->table)
1150                 return -1;
1151
1152         return strcmp(obj->key.name, k->name);
1153 }
1154
1155 static bool nft_supported_family(u8 family)
1156 {
1157         return false
1158 #ifdef CONFIG_NF_TABLES_INET
1159                 || family == NFPROTO_INET
1160 #endif
1161 #ifdef CONFIG_NF_TABLES_IPV4
1162                 || family == NFPROTO_IPV4
1163 #endif
1164 #ifdef CONFIG_NF_TABLES_ARP
1165                 || family == NFPROTO_ARP
1166 #endif
1167 #ifdef CONFIG_NF_TABLES_NETDEV
1168                 || family == NFPROTO_NETDEV
1169 #endif
1170 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1171                 || family == NFPROTO_BRIDGE
1172 #endif
1173 #ifdef CONFIG_NF_TABLES_IPV6
1174                 || family == NFPROTO_IPV6
1175 #endif
1176                 ;
1177 }
1178
1179 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1180                               const struct nlattr * const nla[])
1181 {
1182         struct nftables_pernet *nft_net = nft_pernet(info->net);
1183         struct netlink_ext_ack *extack = info->extack;
1184         u8 genmask = nft_genmask_next(info->net);
1185         u8 family = info->nfmsg->nfgen_family;
1186         struct net *net = info->net;
1187         const struct nlattr *attr;
1188         struct nft_table *table;
1189         struct nft_ctx ctx;
1190         u32 flags = 0;
1191         int err;
1192
1193         if (!nft_supported_family(family))
1194                 return -EOPNOTSUPP;
1195
1196         lockdep_assert_held(&nft_net->commit_mutex);
1197         attr = nla[NFTA_TABLE_NAME];
1198         table = nft_table_lookup(net, attr, family, genmask,
1199                                  NETLINK_CB(skb).portid);
1200         if (IS_ERR(table)) {
1201                 if (PTR_ERR(table) != -ENOENT)
1202                         return PTR_ERR(table);
1203         } else {
1204                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1205                         NL_SET_BAD_ATTR(extack, attr);
1206                         return -EEXIST;
1207                 }
1208                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1209                         return -EOPNOTSUPP;
1210
1211                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1212
1213                 return nf_tables_updtable(&ctx);
1214         }
1215
1216         if (nla[NFTA_TABLE_FLAGS]) {
1217                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1218                 if (flags & ~NFT_TABLE_F_MASK)
1219                         return -EOPNOTSUPP;
1220         }
1221
1222         err = -ENOMEM;
1223         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1224         if (table == NULL)
1225                 goto err_kzalloc;
1226
1227         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1228         if (table->name == NULL)
1229                 goto err_strdup;
1230
1231         if (nla[NFTA_TABLE_USERDATA]) {
1232                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1233                 if (table->udata == NULL)
1234                         goto err_table_udata;
1235
1236                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1237         }
1238
1239         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1240         if (err)
1241                 goto err_chain_ht;
1242
1243         INIT_LIST_HEAD(&table->chains);
1244         INIT_LIST_HEAD(&table->sets);
1245         INIT_LIST_HEAD(&table->objects);
1246         INIT_LIST_HEAD(&table->flowtables);
1247         table->family = family;
1248         table->flags = flags;
1249         table->handle = ++nft_net->table_handle;
1250         if (table->flags & NFT_TABLE_F_OWNER)
1251                 table->nlpid = NETLINK_CB(skb).portid;
1252
1253         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1254         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1255         if (err < 0)
1256                 goto err_trans;
1257
1258         list_add_tail_rcu(&table->list, &nft_net->tables);
1259         return 0;
1260 err_trans:
1261         rhltable_destroy(&table->chains_ht);
1262 err_chain_ht:
1263         kfree(table->udata);
1264 err_table_udata:
1265         kfree(table->name);
1266 err_strdup:
1267         kfree(table);
1268 err_kzalloc:
1269         return err;
1270 }
1271
1272 static int nft_flush_table(struct nft_ctx *ctx)
1273 {
1274         struct nft_flowtable *flowtable, *nft;
1275         struct nft_chain *chain, *nc;
1276         struct nft_object *obj, *ne;
1277         struct nft_set *set, *ns;
1278         int err;
1279
1280         list_for_each_entry(chain, &ctx->table->chains, list) {
1281                 if (!nft_is_active_next(ctx->net, chain))
1282                         continue;
1283
1284                 if (nft_chain_is_bound(chain))
1285                         continue;
1286
1287                 ctx->chain = chain;
1288
1289                 err = nft_delrule_by_chain(ctx);
1290                 if (err < 0)
1291                         goto out;
1292         }
1293
1294         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1295                 if (!nft_is_active_next(ctx->net, set))
1296                         continue;
1297
1298                 if (nft_set_is_anonymous(set) &&
1299                     !list_empty(&set->bindings))
1300                         continue;
1301
1302                 err = nft_delset(ctx, set);
1303                 if (err < 0)
1304                         goto out;
1305         }
1306
1307         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1308                 if (!nft_is_active_next(ctx->net, flowtable))
1309                         continue;
1310
1311                 err = nft_delflowtable(ctx, flowtable);
1312                 if (err < 0)
1313                         goto out;
1314         }
1315
1316         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1317                 if (!nft_is_active_next(ctx->net, obj))
1318                         continue;
1319
1320                 err = nft_delobj(ctx, obj);
1321                 if (err < 0)
1322                         goto out;
1323         }
1324
1325         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1326                 if (!nft_is_active_next(ctx->net, chain))
1327                         continue;
1328
1329                 if (nft_chain_is_bound(chain))
1330                         continue;
1331
1332                 ctx->chain = chain;
1333
1334                 err = nft_delchain(ctx);
1335                 if (err < 0)
1336                         goto out;
1337         }
1338
1339         err = nft_deltable(ctx);
1340 out:
1341         return err;
1342 }
1343
1344 static int nft_flush(struct nft_ctx *ctx, int family)
1345 {
1346         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1347         const struct nlattr * const *nla = ctx->nla;
1348         struct nft_table *table, *nt;
1349         int err = 0;
1350
1351         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1352                 if (family != AF_UNSPEC && table->family != family)
1353                         continue;
1354
1355                 ctx->family = table->family;
1356
1357                 if (!nft_is_active_next(ctx->net, table))
1358                         continue;
1359
1360                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1361                         continue;
1362
1363                 if (nla[NFTA_TABLE_NAME] &&
1364                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1365                         continue;
1366
1367                 ctx->table = table;
1368
1369                 err = nft_flush_table(ctx);
1370                 if (err < 0)
1371                         goto out;
1372         }
1373 out:
1374         return err;
1375 }
1376
1377 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1378                               const struct nlattr * const nla[])
1379 {
1380         struct netlink_ext_ack *extack = info->extack;
1381         u8 genmask = nft_genmask_next(info->net);
1382         u8 family = info->nfmsg->nfgen_family;
1383         struct net *net = info->net;
1384         const struct nlattr *attr;
1385         struct nft_table *table;
1386         struct nft_ctx ctx;
1387
1388         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1389         if (family == AF_UNSPEC ||
1390             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1391                 return nft_flush(&ctx, family);
1392
1393         if (nla[NFTA_TABLE_HANDLE]) {
1394                 attr = nla[NFTA_TABLE_HANDLE];
1395                 table = nft_table_lookup_byhandle(net, attr, genmask,
1396                                                   NETLINK_CB(skb).portid);
1397         } else {
1398                 attr = nla[NFTA_TABLE_NAME];
1399                 table = nft_table_lookup(net, attr, family, genmask,
1400                                          NETLINK_CB(skb).portid);
1401         }
1402
1403         if (IS_ERR(table)) {
1404                 if (PTR_ERR(table) == -ENOENT &&
1405                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1406                         return 0;
1407
1408                 NL_SET_BAD_ATTR(extack, attr);
1409                 return PTR_ERR(table);
1410         }
1411
1412         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1413             table->use > 0)
1414                 return -EBUSY;
1415
1416         ctx.family = family;
1417         ctx.table = table;
1418
1419         return nft_flush_table(&ctx);
1420 }
1421
1422 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1423 {
1424         if (WARN_ON(ctx->table->use > 0))
1425                 return;
1426
1427         rhltable_destroy(&ctx->table->chains_ht);
1428         kfree(ctx->table->name);
1429         kfree(ctx->table->udata);
1430         kfree(ctx->table);
1431 }
1432
1433 void nft_register_chain_type(const struct nft_chain_type *ctype)
1434 {
1435         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1436         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1437                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1438                 return;
1439         }
1440         chain_type[ctype->family][ctype->type] = ctype;
1441         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1442 }
1443 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1444
1445 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1446 {
1447         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1448         chain_type[ctype->family][ctype->type] = NULL;
1449         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1450 }
1451 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1452
1453 /*
1454  * Chains
1455  */
1456
1457 static struct nft_chain *
1458 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1459 {
1460         struct nft_chain *chain;
1461
1462         list_for_each_entry(chain, &table->chains, list) {
1463                 if (chain->handle == handle &&
1464                     nft_active_genmask(chain, genmask))
1465                         return chain;
1466         }
1467
1468         return ERR_PTR(-ENOENT);
1469 }
1470
1471 static bool lockdep_commit_lock_is_held(const struct net *net)
1472 {
1473 #ifdef CONFIG_PROVE_LOCKING
1474         struct nftables_pernet *nft_net = nft_pernet(net);
1475
1476         return lockdep_is_held(&nft_net->commit_mutex);
1477 #else
1478         return true;
1479 #endif
1480 }
1481
1482 static struct nft_chain *nft_chain_lookup(struct net *net,
1483                                           struct nft_table *table,
1484                                           const struct nlattr *nla, u8 genmask)
1485 {
1486         char search[NFT_CHAIN_MAXNAMELEN + 1];
1487         struct rhlist_head *tmp, *list;
1488         struct nft_chain *chain;
1489
1490         if (nla == NULL)
1491                 return ERR_PTR(-EINVAL);
1492
1493         nla_strscpy(search, nla, sizeof(search));
1494
1495         WARN_ON(!rcu_read_lock_held() &&
1496                 !lockdep_commit_lock_is_held(net));
1497
1498         chain = ERR_PTR(-ENOENT);
1499         rcu_read_lock();
1500         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1501         if (!list)
1502                 goto out_unlock;
1503
1504         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1505                 if (nft_active_genmask(chain, genmask))
1506                         goto out_unlock;
1507         }
1508         chain = ERR_PTR(-ENOENT);
1509 out_unlock:
1510         rcu_read_unlock();
1511         return chain;
1512 }
1513
1514 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1515         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1516                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1517         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1518         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1519                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1520         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1521         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1522         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1523                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1524         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1525         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1526         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1527         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1528                                     .len = NFT_USERDATA_MAXLEN },
1529 };
1530
1531 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1532         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1533         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1534         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1535                                     .len = IFNAMSIZ - 1 },
1536 };
1537
1538 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1539 {
1540         struct nft_stats *cpu_stats, total;
1541         struct nlattr *nest;
1542         unsigned int seq;
1543         u64 pkts, bytes;
1544         int cpu;
1545
1546         if (!stats)
1547                 return 0;
1548
1549         memset(&total, 0, sizeof(total));
1550         for_each_possible_cpu(cpu) {
1551                 cpu_stats = per_cpu_ptr(stats, cpu);
1552                 do {
1553                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1554                         pkts = cpu_stats->pkts;
1555                         bytes = cpu_stats->bytes;
1556                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1557                 total.pkts += pkts;
1558                 total.bytes += bytes;
1559         }
1560         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1561         if (nest == NULL)
1562                 goto nla_put_failure;
1563
1564         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1565                          NFTA_COUNTER_PAD) ||
1566             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1567                          NFTA_COUNTER_PAD))
1568                 goto nla_put_failure;
1569
1570         nla_nest_end(skb, nest);
1571         return 0;
1572
1573 nla_put_failure:
1574         return -ENOSPC;
1575 }
1576
1577 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1578                                    const struct nft_base_chain *basechain)
1579 {
1580         const struct nf_hook_ops *ops = &basechain->ops;
1581         struct nft_hook *hook, *first = NULL;
1582         struct nlattr *nest, *nest_devs;
1583         int n = 0;
1584
1585         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1586         if (nest == NULL)
1587                 goto nla_put_failure;
1588         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1589                 goto nla_put_failure;
1590         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1591                 goto nla_put_failure;
1592
1593         if (nft_base_chain_netdev(family, ops->hooknum)) {
1594                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1595                 list_for_each_entry(hook, &basechain->hook_list, list) {
1596                         if (!first)
1597                                 first = hook;
1598
1599                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1600                                            hook->ops.dev->name))
1601                                 goto nla_put_failure;
1602                         n++;
1603                 }
1604                 nla_nest_end(skb, nest_devs);
1605
1606                 if (n == 1 &&
1607                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1608                         goto nla_put_failure;
1609         }
1610         nla_nest_end(skb, nest);
1611
1612         return 0;
1613 nla_put_failure:
1614         return -1;
1615 }
1616
1617 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1618                                      u32 portid, u32 seq, int event, u32 flags,
1619                                      int family, const struct nft_table *table,
1620                                      const struct nft_chain *chain)
1621 {
1622         struct nlmsghdr *nlh;
1623
1624         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1625         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1626                            NFNETLINK_V0, nft_base_seq(net));
1627         if (!nlh)
1628                 goto nla_put_failure;
1629
1630         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1631                 goto nla_put_failure;
1632         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1633                          NFTA_CHAIN_PAD))
1634                 goto nla_put_failure;
1635         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1636                 goto nla_put_failure;
1637
1638         if (nft_is_base_chain(chain)) {
1639                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1640                 struct nft_stats __percpu *stats;
1641
1642                 if (nft_dump_basechain_hook(skb, family, basechain))
1643                         goto nla_put_failure;
1644
1645                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1646                                  htonl(basechain->policy)))
1647                         goto nla_put_failure;
1648
1649                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1650                         goto nla_put_failure;
1651
1652                 stats = rcu_dereference_check(basechain->stats,
1653                                               lockdep_commit_lock_is_held(net));
1654                 if (nft_dump_stats(skb, stats))
1655                         goto nla_put_failure;
1656         }
1657
1658         if (chain->flags &&
1659             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1660                 goto nla_put_failure;
1661
1662         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1663                 goto nla_put_failure;
1664
1665         if (chain->udata &&
1666             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1667                 goto nla_put_failure;
1668
1669         nlmsg_end(skb, nlh);
1670         return 0;
1671
1672 nla_put_failure:
1673         nlmsg_trim(skb, nlh);
1674         return -1;
1675 }
1676
1677 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1678 {
1679         struct nftables_pernet *nft_net;
1680         struct sk_buff *skb;
1681         u16 flags = 0;
1682         int err;
1683
1684         if (!ctx->report &&
1685             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1686                 return;
1687
1688         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1689         if (skb == NULL)
1690                 goto err;
1691
1692         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1693                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1694
1695         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1696                                         event, flags, ctx->family, ctx->table,
1697                                         ctx->chain);
1698         if (err < 0) {
1699                 kfree_skb(skb);
1700                 goto err;
1701         }
1702
1703         nft_net = nft_pernet(ctx->net);
1704         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1705         return;
1706 err:
1707         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1708 }
1709
1710 static int nf_tables_dump_chains(struct sk_buff *skb,
1711                                  struct netlink_callback *cb)
1712 {
1713         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1714         unsigned int idx = 0, s_idx = cb->args[0];
1715         struct net *net = sock_net(skb->sk);
1716         int family = nfmsg->nfgen_family;
1717         struct nftables_pernet *nft_net;
1718         const struct nft_table *table;
1719         const struct nft_chain *chain;
1720
1721         rcu_read_lock();
1722         nft_net = nft_pernet(net);
1723         cb->seq = READ_ONCE(nft_net->base_seq);
1724
1725         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1726                 if (family != NFPROTO_UNSPEC && family != table->family)
1727                         continue;
1728
1729                 list_for_each_entry_rcu(chain, &table->chains, list) {
1730                         if (idx < s_idx)
1731                                 goto cont;
1732                         if (idx > s_idx)
1733                                 memset(&cb->args[1], 0,
1734                                        sizeof(cb->args) - sizeof(cb->args[0]));
1735                         if (!nft_is_active(net, chain))
1736                                 continue;
1737                         if (nf_tables_fill_chain_info(skb, net,
1738                                                       NETLINK_CB(cb->skb).portid,
1739                                                       cb->nlh->nlmsg_seq,
1740                                                       NFT_MSG_NEWCHAIN,
1741                                                       NLM_F_MULTI,
1742                                                       table->family, table,
1743                                                       chain) < 0)
1744                                 goto done;
1745
1746                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1747 cont:
1748                         idx++;
1749                 }
1750         }
1751 done:
1752         rcu_read_unlock();
1753         cb->args[0] = idx;
1754         return skb->len;
1755 }
1756
1757 /* called with rcu_read_lock held */
1758 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1759                               const struct nlattr * const nla[])
1760 {
1761         struct netlink_ext_ack *extack = info->extack;
1762         u8 genmask = nft_genmask_cur(info->net);
1763         u8 family = info->nfmsg->nfgen_family;
1764         const struct nft_chain *chain;
1765         struct net *net = info->net;
1766         struct nft_table *table;
1767         struct sk_buff *skb2;
1768         int err;
1769
1770         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1771                 struct netlink_dump_control c = {
1772                         .dump = nf_tables_dump_chains,
1773                         .module = THIS_MODULE,
1774                 };
1775
1776                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1777         }
1778
1779         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1780         if (IS_ERR(table)) {
1781                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1782                 return PTR_ERR(table);
1783         }
1784
1785         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1786         if (IS_ERR(chain)) {
1787                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1788                 return PTR_ERR(chain);
1789         }
1790
1791         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1792         if (!skb2)
1793                 return -ENOMEM;
1794
1795         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1796                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1797                                         0, family, table, chain);
1798         if (err < 0)
1799                 goto err_fill_chain_info;
1800
1801         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1802
1803 err_fill_chain_info:
1804         kfree_skb(skb2);
1805         return err;
1806 }
1807
1808 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1809         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1810         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1811 };
1812
1813 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1814 {
1815         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1816         struct nft_stats __percpu *newstats;
1817         struct nft_stats *stats;
1818         int err;
1819
1820         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1821                                           nft_counter_policy, NULL);
1822         if (err < 0)
1823                 return ERR_PTR(err);
1824
1825         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1826                 return ERR_PTR(-EINVAL);
1827
1828         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1829         if (newstats == NULL)
1830                 return ERR_PTR(-ENOMEM);
1831
1832         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1833          * are not exposed to userspace.
1834          */
1835         preempt_disable();
1836         stats = this_cpu_ptr(newstats);
1837         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1838         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1839         preempt_enable();
1840
1841         return newstats;
1842 }
1843
1844 static void nft_chain_stats_replace(struct nft_trans *trans)
1845 {
1846         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1847
1848         if (!nft_trans_chain_stats(trans))
1849                 return;
1850
1851         nft_trans_chain_stats(trans) =
1852                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1853                                     lockdep_commit_lock_is_held(trans->ctx.net));
1854
1855         if (!nft_trans_chain_stats(trans))
1856                 static_branch_inc(&nft_counters_enabled);
1857 }
1858
1859 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1860 {
1861         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1862         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1863
1864         if (g0 != g1)
1865                 kvfree(g1);
1866         kvfree(g0);
1867
1868         /* should be NULL either via abort or via successful commit */
1869         WARN_ON_ONCE(chain->blob_next);
1870         kvfree(chain->blob_next);
1871 }
1872
1873 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1874 {
1875         struct nft_chain *chain = ctx->chain;
1876         struct nft_hook *hook, *next;
1877
1878         if (WARN_ON(chain->use > 0))
1879                 return;
1880
1881         /* no concurrent access possible anymore */
1882         nf_tables_chain_free_chain_rules(chain);
1883
1884         if (nft_is_base_chain(chain)) {
1885                 struct nft_base_chain *basechain = nft_base_chain(chain);
1886
1887                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1888                         list_for_each_entry_safe(hook, next,
1889                                                  &basechain->hook_list, list) {
1890                                 list_del_rcu(&hook->list);
1891                                 kfree_rcu(hook, rcu);
1892                         }
1893                 }
1894                 module_put(basechain->type->owner);
1895                 if (rcu_access_pointer(basechain->stats)) {
1896                         static_branch_dec(&nft_counters_enabled);
1897                         free_percpu(rcu_dereference_raw(basechain->stats));
1898                 }
1899                 kfree(chain->name);
1900                 kfree(chain->udata);
1901                 kfree(basechain);
1902         } else {
1903                 kfree(chain->name);
1904                 kfree(chain->udata);
1905                 kfree(chain);
1906         }
1907 }
1908
1909 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1910                                               const struct nlattr *attr)
1911 {
1912         struct net_device *dev;
1913         char ifname[IFNAMSIZ];
1914         struct nft_hook *hook;
1915         int err;
1916
1917         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
1918         if (!hook) {
1919                 err = -ENOMEM;
1920                 goto err_hook_alloc;
1921         }
1922
1923         nla_strscpy(ifname, attr, IFNAMSIZ);
1924         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1925          * indirectly serializing all the other holders of the commit_mutex with
1926          * the rtnl_mutex.
1927          */
1928         dev = __dev_get_by_name(net, ifname);
1929         if (!dev) {
1930                 err = -ENOENT;
1931                 goto err_hook_dev;
1932         }
1933         hook->ops.dev = dev;
1934
1935         return hook;
1936
1937 err_hook_dev:
1938         kfree(hook);
1939 err_hook_alloc:
1940         return ERR_PTR(err);
1941 }
1942
1943 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1944                                            const struct nft_hook *this)
1945 {
1946         struct nft_hook *hook;
1947
1948         list_for_each_entry(hook, hook_list, list) {
1949                 if (this->ops.dev == hook->ops.dev)
1950                         return hook;
1951         }
1952
1953         return NULL;
1954 }
1955
1956 static int nf_tables_parse_netdev_hooks(struct net *net,
1957                                         const struct nlattr *attr,
1958                                         struct list_head *hook_list)
1959 {
1960         struct nft_hook *hook, *next;
1961         const struct nlattr *tmp;
1962         int rem, n = 0, err;
1963
1964         nla_for_each_nested(tmp, attr, rem) {
1965                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1966                         err = -EINVAL;
1967                         goto err_hook;
1968                 }
1969
1970                 hook = nft_netdev_hook_alloc(net, tmp);
1971                 if (IS_ERR(hook)) {
1972                         err = PTR_ERR(hook);
1973                         goto err_hook;
1974                 }
1975                 if (nft_hook_list_find(hook_list, hook)) {
1976                         kfree(hook);
1977                         err = -EEXIST;
1978                         goto err_hook;
1979                 }
1980                 list_add_tail(&hook->list, hook_list);
1981                 n++;
1982
1983                 if (n == NFT_NETDEVICE_MAX) {
1984                         err = -EFBIG;
1985                         goto err_hook;
1986                 }
1987         }
1988
1989         return 0;
1990
1991 err_hook:
1992         list_for_each_entry_safe(hook, next, hook_list, list) {
1993                 list_del(&hook->list);
1994                 kfree(hook);
1995         }
1996         return err;
1997 }
1998
1999 struct nft_chain_hook {
2000         u32                             num;
2001         s32                             priority;
2002         const struct nft_chain_type     *type;
2003         struct list_head                list;
2004 };
2005
2006 static int nft_chain_parse_netdev(struct net *net,
2007                                   struct nlattr *tb[],
2008                                   struct list_head *hook_list)
2009 {
2010         struct nft_hook *hook;
2011         int err;
2012
2013         if (tb[NFTA_HOOK_DEV]) {
2014                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2015                 if (IS_ERR(hook))
2016                         return PTR_ERR(hook);
2017
2018                 list_add_tail(&hook->list, hook_list);
2019         } else if (tb[NFTA_HOOK_DEVS]) {
2020                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2021                                                    hook_list);
2022                 if (err < 0)
2023                         return err;
2024
2025                 if (list_empty(hook_list))
2026                         return -EINVAL;
2027         } else {
2028                 return -EINVAL;
2029         }
2030
2031         return 0;
2032 }
2033
2034 static int nft_chain_parse_hook(struct net *net,
2035                                 const struct nlattr * const nla[],
2036                                 struct nft_chain_hook *hook, u8 family,
2037                                 struct netlink_ext_ack *extack, bool autoload)
2038 {
2039         struct nftables_pernet *nft_net = nft_pernet(net);
2040         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2041         const struct nft_chain_type *type;
2042         int err;
2043
2044         lockdep_assert_held(&nft_net->commit_mutex);
2045         lockdep_nfnl_nft_mutex_not_held();
2046
2047         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2048                                           nla[NFTA_CHAIN_HOOK],
2049                                           nft_hook_policy, NULL);
2050         if (err < 0)
2051                 return err;
2052
2053         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
2054             ha[NFTA_HOOK_PRIORITY] == NULL)
2055                 return -EINVAL;
2056
2057         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2058         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2059
2060         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2061         if (!type)
2062                 return -EOPNOTSUPP;
2063
2064         if (nla[NFTA_CHAIN_TYPE]) {
2065                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2066                                                    family, autoload);
2067                 if (IS_ERR(type)) {
2068                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2069                         return PTR_ERR(type);
2070                 }
2071         }
2072         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2073                 return -EOPNOTSUPP;
2074
2075         if (type->type == NFT_CHAIN_T_NAT &&
2076             hook->priority <= NF_IP_PRI_CONNTRACK)
2077                 return -EOPNOTSUPP;
2078
2079         if (!try_module_get(type->owner)) {
2080                 if (nla[NFTA_CHAIN_TYPE])
2081                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2082                 return -ENOENT;
2083         }
2084
2085         hook->type = type;
2086
2087         INIT_LIST_HEAD(&hook->list);
2088         if (nft_base_chain_netdev(family, hook->num)) {
2089                 err = nft_chain_parse_netdev(net, ha, &hook->list);
2090                 if (err < 0) {
2091                         module_put(type->owner);
2092                         return err;
2093                 }
2094         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2095                 module_put(type->owner);
2096                 return -EOPNOTSUPP;
2097         }
2098
2099         return 0;
2100 }
2101
2102 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2103 {
2104         struct nft_hook *h, *next;
2105
2106         list_for_each_entry_safe(h, next, &hook->list, list) {
2107                 list_del(&h->list);
2108                 kfree(h);
2109         }
2110         module_put(hook->type->owner);
2111 }
2112
2113 struct nft_rule_dp_last {
2114         struct nft_rule_dp end; /* end of nft_rule_blob marker */
2115         struct rcu_head h;
2116         struct nft_rule_blob *blob;
2117         const struct nft_chain *chain;  /* for tracing */
2118 };
2119
2120 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2121 {
2122         struct nft_rule_dp_last *lrule;
2123
2124         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2125
2126         lrule = (struct nft_rule_dp_last *)ptr;
2127         lrule->end.is_last = 1;
2128         lrule->chain = chain;
2129         /* blob size does not include the trailer rule */
2130 }
2131
2132 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2133                                                          unsigned int size)
2134 {
2135         struct nft_rule_blob *blob;
2136
2137         if (size > INT_MAX)
2138                 return NULL;
2139
2140         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2141
2142         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2143         if (!blob)
2144                 return NULL;
2145
2146         blob->size = 0;
2147         nft_last_rule(chain, blob->data);
2148
2149         return blob;
2150 }
2151
2152 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2153                                     const struct nft_chain_hook *hook,
2154                                     struct nft_chain *chain)
2155 {
2156         ops->pf                 = family;
2157         ops->hooknum            = hook->num;
2158         ops->priority           = hook->priority;
2159         ops->priv               = chain;
2160         ops->hook               = hook->type->hooks[ops->hooknum];
2161         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2162 }
2163
2164 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2165                               struct nft_chain_hook *hook, u32 flags)
2166 {
2167         struct nft_chain *chain;
2168         struct nft_hook *h;
2169
2170         basechain->type = hook->type;
2171         INIT_LIST_HEAD(&basechain->hook_list);
2172         chain = &basechain->chain;
2173
2174         if (nft_base_chain_netdev(family, hook->num)) {
2175                 list_splice_init(&hook->list, &basechain->hook_list);
2176                 list_for_each_entry(h, &basechain->hook_list, list)
2177                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2178
2179                 basechain->ops.hooknum  = hook->num;
2180                 basechain->ops.priority = hook->priority;
2181         } else {
2182                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2183         }
2184
2185         chain->flags |= NFT_CHAIN_BASE | flags;
2186         basechain->policy = NF_ACCEPT;
2187         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2188             !nft_chain_offload_support(basechain)) {
2189                 list_splice_init(&basechain->hook_list, &hook->list);
2190                 return -EOPNOTSUPP;
2191         }
2192
2193         flow_block_init(&basechain->flow_block);
2194
2195         return 0;
2196 }
2197
2198 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2199 {
2200         int err;
2201
2202         err = rhltable_insert_key(&table->chains_ht, chain->name,
2203                                   &chain->rhlhead, nft_chain_ht_params);
2204         if (err)
2205                 return err;
2206
2207         list_add_tail_rcu(&chain->list, &table->chains);
2208
2209         return 0;
2210 }
2211
2212 static u64 chain_id;
2213
2214 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2215                               u8 policy, u32 flags,
2216                               struct netlink_ext_ack *extack)
2217 {
2218         const struct nlattr * const *nla = ctx->nla;
2219         struct nft_table *table = ctx->table;
2220         struct nft_base_chain *basechain;
2221         struct net *net = ctx->net;
2222         char name[NFT_NAME_MAXLEN];
2223         struct nft_rule_blob *blob;
2224         struct nft_trans *trans;
2225         struct nft_chain *chain;
2226         int err;
2227
2228         if (table->use == UINT_MAX)
2229                 return -EOVERFLOW;
2230
2231         if (nla[NFTA_CHAIN_HOOK]) {
2232                 struct nft_stats __percpu *stats = NULL;
2233                 struct nft_chain_hook hook;
2234
2235                 if (flags & NFT_CHAIN_BINDING)
2236                         return -EOPNOTSUPP;
2237
2238                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2239                                            true);
2240                 if (err < 0)
2241                         return err;
2242
2243                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2244                 if (basechain == NULL) {
2245                         nft_chain_release_hook(&hook);
2246                         return -ENOMEM;
2247                 }
2248                 chain = &basechain->chain;
2249
2250                 if (nla[NFTA_CHAIN_COUNTERS]) {
2251                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2252                         if (IS_ERR(stats)) {
2253                                 nft_chain_release_hook(&hook);
2254                                 kfree(basechain);
2255                                 return PTR_ERR(stats);
2256                         }
2257                         rcu_assign_pointer(basechain->stats, stats);
2258                 }
2259
2260                 err = nft_basechain_init(basechain, family, &hook, flags);
2261                 if (err < 0) {
2262                         nft_chain_release_hook(&hook);
2263                         kfree(basechain);
2264                         free_percpu(stats);
2265                         return err;
2266                 }
2267                 if (stats)
2268                         static_branch_inc(&nft_counters_enabled);
2269         } else {
2270                 if (flags & NFT_CHAIN_BASE)
2271                         return -EINVAL;
2272                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2273                         return -EOPNOTSUPP;
2274
2275                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2276                 if (chain == NULL)
2277                         return -ENOMEM;
2278
2279                 chain->flags = flags;
2280         }
2281         ctx->chain = chain;
2282
2283         INIT_LIST_HEAD(&chain->rules);
2284         chain->handle = nf_tables_alloc_handle(table);
2285         chain->table = table;
2286
2287         if (nla[NFTA_CHAIN_NAME]) {
2288                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2289         } else {
2290                 if (!(flags & NFT_CHAIN_BINDING)) {
2291                         err = -EINVAL;
2292                         goto err_destroy_chain;
2293                 }
2294
2295                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2296                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2297         }
2298
2299         if (!chain->name) {
2300                 err = -ENOMEM;
2301                 goto err_destroy_chain;
2302         }
2303
2304         if (nla[NFTA_CHAIN_USERDATA]) {
2305                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2306                 if (chain->udata == NULL) {
2307                         err = -ENOMEM;
2308                         goto err_destroy_chain;
2309                 }
2310                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2311         }
2312
2313         blob = nf_tables_chain_alloc_rules(chain, 0);
2314         if (!blob) {
2315                 err = -ENOMEM;
2316                 goto err_destroy_chain;
2317         }
2318
2319         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2320         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2321
2322         err = nf_tables_register_hook(net, table, chain);
2323         if (err < 0)
2324                 goto err_destroy_chain;
2325
2326         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2327         if (IS_ERR(trans)) {
2328                 err = PTR_ERR(trans);
2329                 goto err_unregister_hook;
2330         }
2331
2332         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2333         if (nft_is_base_chain(chain))
2334                 nft_trans_chain_policy(trans) = policy;
2335
2336         err = nft_chain_add(table, chain);
2337         if (err < 0) {
2338                 nft_trans_destroy(trans);
2339                 goto err_unregister_hook;
2340         }
2341
2342         table->use++;
2343
2344         return 0;
2345 err_unregister_hook:
2346         nf_tables_unregister_hook(net, table, chain);
2347 err_destroy_chain:
2348         nf_tables_chain_destroy(ctx);
2349
2350         return err;
2351 }
2352
2353 static bool nft_hook_list_equal(struct list_head *hook_list1,
2354                                 struct list_head *hook_list2)
2355 {
2356         struct nft_hook *hook;
2357         int n = 0, m = 0;
2358
2359         n = 0;
2360         list_for_each_entry(hook, hook_list2, list) {
2361                 if (!nft_hook_list_find(hook_list1, hook))
2362                         return false;
2363
2364                 n++;
2365         }
2366         list_for_each_entry(hook, hook_list1, list)
2367                 m++;
2368
2369         return n == m;
2370 }
2371
2372 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2373                               u32 flags, const struct nlattr *attr,
2374                               struct netlink_ext_ack *extack)
2375 {
2376         const struct nlattr * const *nla = ctx->nla;
2377         struct nft_table *table = ctx->table;
2378         struct nft_chain *chain = ctx->chain;
2379         struct nft_base_chain *basechain;
2380         struct nft_stats *stats = NULL;
2381         struct nft_chain_hook hook;
2382         struct nf_hook_ops *ops;
2383         struct nft_trans *trans;
2384         int err;
2385
2386         if (chain->flags ^ flags)
2387                 return -EOPNOTSUPP;
2388
2389         if (nla[NFTA_CHAIN_HOOK]) {
2390                 if (!nft_is_base_chain(chain)) {
2391                         NL_SET_BAD_ATTR(extack, attr);
2392                         return -EEXIST;
2393                 }
2394                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2395                                            extack, false);
2396                 if (err < 0)
2397                         return err;
2398
2399                 basechain = nft_base_chain(chain);
2400                 if (basechain->type != hook.type) {
2401                         nft_chain_release_hook(&hook);
2402                         NL_SET_BAD_ATTR(extack, attr);
2403                         return -EEXIST;
2404                 }
2405
2406                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2407                         if (!nft_hook_list_equal(&basechain->hook_list,
2408                                                  &hook.list)) {
2409                                 nft_chain_release_hook(&hook);
2410                                 NL_SET_BAD_ATTR(extack, attr);
2411                                 return -EEXIST;
2412                         }
2413                 } else {
2414                         ops = &basechain->ops;
2415                         if (ops->hooknum != hook.num ||
2416                             ops->priority != hook.priority) {
2417                                 nft_chain_release_hook(&hook);
2418                                 NL_SET_BAD_ATTR(extack, attr);
2419                                 return -EEXIST;
2420                         }
2421                 }
2422                 nft_chain_release_hook(&hook);
2423         }
2424
2425         if (nla[NFTA_CHAIN_HANDLE] &&
2426             nla[NFTA_CHAIN_NAME]) {
2427                 struct nft_chain *chain2;
2428
2429                 chain2 = nft_chain_lookup(ctx->net, table,
2430                                           nla[NFTA_CHAIN_NAME], genmask);
2431                 if (!IS_ERR(chain2)) {
2432                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2433                         return -EEXIST;
2434                 }
2435         }
2436
2437         if (nla[NFTA_CHAIN_COUNTERS]) {
2438                 if (!nft_is_base_chain(chain))
2439                         return -EOPNOTSUPP;
2440
2441                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2442                 if (IS_ERR(stats))
2443                         return PTR_ERR(stats);
2444         }
2445
2446         err = -ENOMEM;
2447         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2448                                 sizeof(struct nft_trans_chain));
2449         if (trans == NULL)
2450                 goto err;
2451
2452         nft_trans_chain_stats(trans) = stats;
2453         nft_trans_chain_update(trans) = true;
2454
2455         if (nla[NFTA_CHAIN_POLICY])
2456                 nft_trans_chain_policy(trans) = policy;
2457         else
2458                 nft_trans_chain_policy(trans) = -1;
2459
2460         if (nla[NFTA_CHAIN_HANDLE] &&
2461             nla[NFTA_CHAIN_NAME]) {
2462                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2463                 struct nft_trans *tmp;
2464                 char *name;
2465
2466                 err = -ENOMEM;
2467                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2468                 if (!name)
2469                         goto err;
2470
2471                 err = -EEXIST;
2472                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2473                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2474                             tmp->ctx.table == table &&
2475                             nft_trans_chain_update(tmp) &&
2476                             nft_trans_chain_name(tmp) &&
2477                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2478                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2479                                 kfree(name);
2480                                 goto err;
2481                         }
2482                 }
2483
2484                 nft_trans_chain_name(trans) = name;
2485         }
2486         nft_trans_commit_list_add_tail(ctx->net, trans);
2487
2488         return 0;
2489 err:
2490         free_percpu(stats);
2491         kfree(trans);
2492         return err;
2493 }
2494
2495 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2496                                                const struct nft_table *table,
2497                                                const struct nlattr *nla)
2498 {
2499         struct nftables_pernet *nft_net = nft_pernet(net);
2500         u32 id = ntohl(nla_get_be32(nla));
2501         struct nft_trans *trans;
2502
2503         list_for_each_entry(trans, &nft_net->commit_list, list) {
2504                 struct nft_chain *chain = trans->ctx.chain;
2505
2506                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2507                     chain->table == table &&
2508                     id == nft_trans_chain_id(trans))
2509                         return chain;
2510         }
2511         return ERR_PTR(-ENOENT);
2512 }
2513
2514 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2515                               const struct nlattr * const nla[])
2516 {
2517         struct nftables_pernet *nft_net = nft_pernet(info->net);
2518         struct netlink_ext_ack *extack = info->extack;
2519         u8 genmask = nft_genmask_next(info->net);
2520         u8 family = info->nfmsg->nfgen_family;
2521         struct nft_chain *chain = NULL;
2522         struct net *net = info->net;
2523         const struct nlattr *attr;
2524         struct nft_table *table;
2525         u8 policy = NF_ACCEPT;
2526         struct nft_ctx ctx;
2527         u64 handle = 0;
2528         u32 flags = 0;
2529
2530         lockdep_assert_held(&nft_net->commit_mutex);
2531
2532         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2533                                  NETLINK_CB(skb).portid);
2534         if (IS_ERR(table)) {
2535                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2536                 return PTR_ERR(table);
2537         }
2538
2539         chain = NULL;
2540         attr = nla[NFTA_CHAIN_NAME];
2541
2542         if (nla[NFTA_CHAIN_HANDLE]) {
2543                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2544                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2545                 if (IS_ERR(chain)) {
2546                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2547                         return PTR_ERR(chain);
2548                 }
2549                 attr = nla[NFTA_CHAIN_HANDLE];
2550         } else if (nla[NFTA_CHAIN_NAME]) {
2551                 chain = nft_chain_lookup(net, table, attr, genmask);
2552                 if (IS_ERR(chain)) {
2553                         if (PTR_ERR(chain) != -ENOENT) {
2554                                 NL_SET_BAD_ATTR(extack, attr);
2555                                 return PTR_ERR(chain);
2556                         }
2557                         chain = NULL;
2558                 }
2559         } else if (!nla[NFTA_CHAIN_ID]) {
2560                 return -EINVAL;
2561         }
2562
2563         if (nla[NFTA_CHAIN_POLICY]) {
2564                 if (chain != NULL &&
2565                     !nft_is_base_chain(chain)) {
2566                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2567                         return -EOPNOTSUPP;
2568                 }
2569
2570                 if (chain == NULL &&
2571                     nla[NFTA_CHAIN_HOOK] == NULL) {
2572                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2573                         return -EOPNOTSUPP;
2574                 }
2575
2576                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2577                 switch (policy) {
2578                 case NF_DROP:
2579                 case NF_ACCEPT:
2580                         break;
2581                 default:
2582                         return -EINVAL;
2583                 }
2584         }
2585
2586         if (nla[NFTA_CHAIN_FLAGS])
2587                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2588         else if (chain)
2589                 flags = chain->flags;
2590
2591         if (flags & ~NFT_CHAIN_FLAGS)
2592                 return -EOPNOTSUPP;
2593
2594         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2595
2596         if (chain != NULL) {
2597                 if (chain->flags & NFT_CHAIN_BINDING)
2598                         return -EINVAL;
2599
2600                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2601                         NL_SET_BAD_ATTR(extack, attr);
2602                         return -EEXIST;
2603                 }
2604                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2605                         return -EOPNOTSUPP;
2606
2607                 flags |= chain->flags & NFT_CHAIN_BASE;
2608                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2609                                           extack);
2610         }
2611
2612         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2613 }
2614
2615 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2616                               const struct nlattr * const nla[])
2617 {
2618         struct netlink_ext_ack *extack = info->extack;
2619         u8 genmask = nft_genmask_next(info->net);
2620         u8 family = info->nfmsg->nfgen_family;
2621         struct net *net = info->net;
2622         const struct nlattr *attr;
2623         struct nft_table *table;
2624         struct nft_chain *chain;
2625         struct nft_rule *rule;
2626         struct nft_ctx ctx;
2627         u64 handle;
2628         u32 use;
2629         int err;
2630
2631         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2632                                  NETLINK_CB(skb).portid);
2633         if (IS_ERR(table)) {
2634                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2635                 return PTR_ERR(table);
2636         }
2637
2638         if (nla[NFTA_CHAIN_HANDLE]) {
2639                 attr = nla[NFTA_CHAIN_HANDLE];
2640                 handle = be64_to_cpu(nla_get_be64(attr));
2641                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2642         } else {
2643                 attr = nla[NFTA_CHAIN_NAME];
2644                 chain = nft_chain_lookup(net, table, attr, genmask);
2645         }
2646         if (IS_ERR(chain)) {
2647                 if (PTR_ERR(chain) == -ENOENT &&
2648                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2649                         return 0;
2650
2651                 NL_SET_BAD_ATTR(extack, attr);
2652                 return PTR_ERR(chain);
2653         }
2654
2655         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2656             chain->use > 0)
2657                 return -EBUSY;
2658
2659         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2660
2661         use = chain->use;
2662         list_for_each_entry(rule, &chain->rules, list) {
2663                 if (!nft_is_active_next(net, rule))
2664                         continue;
2665                 use--;
2666
2667                 err = nft_delrule(&ctx, rule);
2668                 if (err < 0)
2669                         return err;
2670         }
2671
2672         /* There are rules and elements that are still holding references to us,
2673          * we cannot do a recursive removal in this case.
2674          */
2675         if (use > 0) {
2676                 NL_SET_BAD_ATTR(extack, attr);
2677                 return -EBUSY;
2678         }
2679
2680         return nft_delchain(&ctx);
2681 }
2682
2683 /*
2684  * Expressions
2685  */
2686
2687 /**
2688  *      nft_register_expr - register nf_tables expr type
2689  *      @type: expr type
2690  *
2691  *      Registers the expr type for use with nf_tables. Returns zero on
2692  *      success or a negative errno code otherwise.
2693  */
2694 int nft_register_expr(struct nft_expr_type *type)
2695 {
2696         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2697         if (type->family == NFPROTO_UNSPEC)
2698                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2699         else
2700                 list_add_rcu(&type->list, &nf_tables_expressions);
2701         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2702         return 0;
2703 }
2704 EXPORT_SYMBOL_GPL(nft_register_expr);
2705
2706 /**
2707  *      nft_unregister_expr - unregister nf_tables expr type
2708  *      @type: expr type
2709  *
2710  *      Unregisters the expr typefor use with nf_tables.
2711  */
2712 void nft_unregister_expr(struct nft_expr_type *type)
2713 {
2714         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2715         list_del_rcu(&type->list);
2716         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2717 }
2718 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2719
2720 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2721                                                        struct nlattr *nla)
2722 {
2723         const struct nft_expr_type *type, *candidate = NULL;
2724
2725         list_for_each_entry(type, &nf_tables_expressions, list) {
2726                 if (!nla_strcmp(nla, type->name)) {
2727                         if (!type->family && !candidate)
2728                                 candidate = type;
2729                         else if (type->family == family)
2730                                 candidate = type;
2731                 }
2732         }
2733         return candidate;
2734 }
2735
2736 #ifdef CONFIG_MODULES
2737 static int nft_expr_type_request_module(struct net *net, u8 family,
2738                                         struct nlattr *nla)
2739 {
2740         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2741                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2742                 return -EAGAIN;
2743
2744         return 0;
2745 }
2746 #endif
2747
2748 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2749                                                      u8 family,
2750                                                      struct nlattr *nla)
2751 {
2752         const struct nft_expr_type *type;
2753
2754         if (nla == NULL)
2755                 return ERR_PTR(-EINVAL);
2756
2757         type = __nft_expr_type_get(family, nla);
2758         if (type != NULL && try_module_get(type->owner))
2759                 return type;
2760
2761         lockdep_nfnl_nft_mutex_not_held();
2762 #ifdef CONFIG_MODULES
2763         if (type == NULL) {
2764                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2765                         return ERR_PTR(-EAGAIN);
2766
2767                 if (nft_request_module(net, "nft-expr-%.*s",
2768                                        nla_len(nla),
2769                                        (char *)nla_data(nla)) == -EAGAIN)
2770                         return ERR_PTR(-EAGAIN);
2771         }
2772 #endif
2773         return ERR_PTR(-ENOENT);
2774 }
2775
2776 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2777         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2778                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2779         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2780 };
2781
2782 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2783                                     const struct nft_expr *expr, bool reset)
2784 {
2785         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2786                 goto nla_put_failure;
2787
2788         if (expr->ops->dump) {
2789                 struct nlattr *data = nla_nest_start_noflag(skb,
2790                                                             NFTA_EXPR_DATA);
2791                 if (data == NULL)
2792                         goto nla_put_failure;
2793                 if (expr->ops->dump(skb, expr, reset) < 0)
2794                         goto nla_put_failure;
2795                 nla_nest_end(skb, data);
2796         }
2797
2798         return skb->len;
2799
2800 nla_put_failure:
2801         return -1;
2802 };
2803
2804 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2805                   const struct nft_expr *expr, bool reset)
2806 {
2807         struct nlattr *nest;
2808
2809         nest = nla_nest_start_noflag(skb, attr);
2810         if (!nest)
2811                 goto nla_put_failure;
2812         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
2813                 goto nla_put_failure;
2814         nla_nest_end(skb, nest);
2815         return 0;
2816
2817 nla_put_failure:
2818         return -1;
2819 }
2820
2821 struct nft_expr_info {
2822         const struct nft_expr_ops       *ops;
2823         const struct nlattr             *attr;
2824         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2825 };
2826
2827 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2828                                 const struct nlattr *nla,
2829                                 struct nft_expr_info *info)
2830 {
2831         const struct nft_expr_type *type;
2832         const struct nft_expr_ops *ops;
2833         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2834         int err;
2835
2836         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2837                                           nft_expr_policy, NULL);
2838         if (err < 0)
2839                 return err;
2840
2841         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2842         if (IS_ERR(type))
2843                 return PTR_ERR(type);
2844
2845         if (tb[NFTA_EXPR_DATA]) {
2846                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2847                                                   tb[NFTA_EXPR_DATA],
2848                                                   type->policy, NULL);
2849                 if (err < 0)
2850                         goto err1;
2851         } else
2852                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2853
2854         if (type->select_ops != NULL) {
2855                 ops = type->select_ops(ctx,
2856                                        (const struct nlattr * const *)info->tb);
2857                 if (IS_ERR(ops)) {
2858                         err = PTR_ERR(ops);
2859 #ifdef CONFIG_MODULES
2860                         if (err == -EAGAIN)
2861                                 if (nft_expr_type_request_module(ctx->net,
2862                                                                  ctx->family,
2863                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2864                                         err = -ENOENT;
2865 #endif
2866                         goto err1;
2867                 }
2868         } else
2869                 ops = type->ops;
2870
2871         info->attr = nla;
2872         info->ops = ops;
2873
2874         return 0;
2875
2876 err1:
2877         module_put(type->owner);
2878         return err;
2879 }
2880
2881 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
2882                          struct nft_expr_info *info)
2883 {
2884         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2885         const struct nft_expr_type *type;
2886         int err;
2887
2888         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2889                                           nft_expr_policy, NULL);
2890         if (err < 0)
2891                 return err;
2892
2893         if (!tb[NFTA_EXPR_DATA])
2894                 return -EINVAL;
2895
2896         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
2897         if (!type)
2898                 return -ENOENT;
2899
2900         if (!type->inner_ops)
2901                 return -EOPNOTSUPP;
2902
2903         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2904                                           tb[NFTA_EXPR_DATA],
2905                                           type->policy, NULL);
2906         if (err < 0)
2907                 goto err_nla_parse;
2908
2909         info->attr = nla;
2910         info->ops = type->inner_ops;
2911
2912         return 0;
2913
2914 err_nla_parse:
2915         return err;
2916 }
2917
2918 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2919                              const struct nft_expr_info *expr_info,
2920                              struct nft_expr *expr)
2921 {
2922         const struct nft_expr_ops *ops = expr_info->ops;
2923         int err;
2924
2925         expr->ops = ops;
2926         if (ops->init) {
2927                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2928                 if (err < 0)
2929                         goto err1;
2930         }
2931
2932         return 0;
2933 err1:
2934         expr->ops = NULL;
2935         return err;
2936 }
2937
2938 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2939                                    struct nft_expr *expr)
2940 {
2941         const struct nft_expr_type *type = expr->ops->type;
2942
2943         if (expr->ops->destroy)
2944                 expr->ops->destroy(ctx, expr);
2945         module_put(type->owner);
2946 }
2947
2948 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2949                                       const struct nlattr *nla)
2950 {
2951         struct nft_expr_info expr_info;
2952         struct nft_expr *expr;
2953         struct module *owner;
2954         int err;
2955
2956         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2957         if (err < 0)
2958                 goto err_expr_parse;
2959
2960         err = -EOPNOTSUPP;
2961         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2962                 goto err_expr_stateful;
2963
2964         err = -ENOMEM;
2965         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
2966         if (expr == NULL)
2967                 goto err_expr_stateful;
2968
2969         err = nf_tables_newexpr(ctx, &expr_info, expr);
2970         if (err < 0)
2971                 goto err_expr_new;
2972
2973         return expr;
2974 err_expr_new:
2975         kfree(expr);
2976 err_expr_stateful:
2977         owner = expr_info.ops->type->owner;
2978         if (expr_info.ops->type->release_ops)
2979                 expr_info.ops->type->release_ops(expr_info.ops);
2980
2981         module_put(owner);
2982 err_expr_parse:
2983         return ERR_PTR(err);
2984 }
2985
2986 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2987 {
2988         int err;
2989
2990         if (src->ops->clone) {
2991                 dst->ops = src->ops;
2992                 err = src->ops->clone(dst, src);
2993                 if (err < 0)
2994                         return err;
2995         } else {
2996                 memcpy(dst, src, src->ops->size);
2997         }
2998
2999         __module_get(src->ops->type->owner);
3000
3001         return 0;
3002 }
3003
3004 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3005 {
3006         nf_tables_expr_destroy(ctx, expr);
3007         kfree(expr);
3008 }
3009
3010 /*
3011  * Rules
3012  */
3013
3014 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3015                                           u64 handle)
3016 {
3017         struct nft_rule *rule;
3018
3019         // FIXME: this sucks
3020         list_for_each_entry_rcu(rule, &chain->rules, list) {
3021                 if (handle == rule->handle)
3022                         return rule;
3023         }
3024
3025         return ERR_PTR(-ENOENT);
3026 }
3027
3028 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3029                                         const struct nlattr *nla)
3030 {
3031         if (nla == NULL)
3032                 return ERR_PTR(-EINVAL);
3033
3034         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3035 }
3036
3037 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3038         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3039                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3040         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3041                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3042         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3043         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3044         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3045         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3046         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3047                                     .len = NFT_USERDATA_MAXLEN },
3048         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3049         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3050         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3051 };
3052
3053 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3054                                     u32 portid, u32 seq, int event,
3055                                     u32 flags, int family,
3056                                     const struct nft_table *table,
3057                                     const struct nft_chain *chain,
3058                                     const struct nft_rule *rule, u64 handle,
3059                                     bool reset)
3060 {
3061         struct nlmsghdr *nlh;
3062         const struct nft_expr *expr, *next;
3063         struct nlattr *list;
3064         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3065
3066         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3067                            nft_base_seq(net));
3068         if (!nlh)
3069                 goto nla_put_failure;
3070
3071         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3072                 goto nla_put_failure;
3073         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3074                 goto nla_put_failure;
3075         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3076                          NFTA_RULE_PAD))
3077                 goto nla_put_failure;
3078
3079         if (event != NFT_MSG_DELRULE && handle) {
3080                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3081                                  NFTA_RULE_PAD))
3082                         goto nla_put_failure;
3083         }
3084
3085         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3086                 nft_flow_rule_stats(chain, rule);
3087
3088         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3089         if (list == NULL)
3090                 goto nla_put_failure;
3091         nft_rule_for_each_expr(expr, next, rule) {
3092                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3093                         goto nla_put_failure;
3094         }
3095         nla_nest_end(skb, list);
3096
3097         if (rule->udata) {
3098                 struct nft_userdata *udata = nft_userdata(rule);
3099                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3100                             udata->data) < 0)
3101                         goto nla_put_failure;
3102         }
3103
3104         nlmsg_end(skb, nlh);
3105         return 0;
3106
3107 nla_put_failure:
3108         nlmsg_trim(skb, nlh);
3109         return -1;
3110 }
3111
3112 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3113                                   const struct nft_rule *rule, int event)
3114 {
3115         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3116         const struct nft_rule *prule;
3117         struct sk_buff *skb;
3118         u64 handle = 0;
3119         u16 flags = 0;
3120         int err;
3121
3122         if (!ctx->report &&
3123             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3124                 return;
3125
3126         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3127         if (skb == NULL)
3128                 goto err;
3129
3130         if (event == NFT_MSG_NEWRULE &&
3131             !list_is_first(&rule->list, &ctx->chain->rules) &&
3132             !list_is_last(&rule->list, &ctx->chain->rules)) {
3133                 prule = list_prev_entry(rule, list);
3134                 handle = prule->handle;
3135         }
3136         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3137                 flags |= NLM_F_APPEND;
3138         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3139                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3140
3141         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3142                                        event, flags, ctx->family, ctx->table,
3143                                        ctx->chain, rule, handle, false);
3144         if (err < 0) {
3145                 kfree_skb(skb);
3146                 goto err;
3147         }
3148
3149         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3150         return;
3151 err:
3152         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3153 }
3154
3155 struct nft_rule_dump_ctx {
3156         char *table;
3157         char *chain;
3158 };
3159
3160 static int __nf_tables_dump_rules(struct sk_buff *skb,
3161                                   unsigned int *idx,
3162                                   struct netlink_callback *cb,
3163                                   const struct nft_table *table,
3164                                   const struct nft_chain *chain,
3165                                   bool reset)
3166 {
3167         struct net *net = sock_net(skb->sk);
3168         const struct nft_rule *rule, *prule;
3169         unsigned int s_idx = cb->args[0];
3170         u64 handle;
3171
3172         prule = NULL;
3173         list_for_each_entry_rcu(rule, &chain->rules, list) {
3174                 if (!nft_is_active(net, rule))
3175                         goto cont_skip;
3176                 if (*idx < s_idx)
3177                         goto cont;
3178                 if (*idx > s_idx) {
3179                         memset(&cb->args[1], 0,
3180                                         sizeof(cb->args) - sizeof(cb->args[0]));
3181                 }
3182                 if (prule)
3183                         handle = prule->handle;
3184                 else
3185                         handle = 0;
3186
3187                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3188                                         cb->nlh->nlmsg_seq,
3189                                         NFT_MSG_NEWRULE,
3190                                         NLM_F_MULTI | NLM_F_APPEND,
3191                                         table->family,
3192                                         table, chain, rule, handle, reset) < 0)
3193                         return 1;
3194
3195                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3196 cont:
3197                 prule = rule;
3198 cont_skip:
3199                 (*idx)++;
3200         }
3201         return 0;
3202 }
3203
3204 static int nf_tables_dump_rules(struct sk_buff *skb,
3205                                 struct netlink_callback *cb)
3206 {
3207         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3208         const struct nft_rule_dump_ctx *ctx = cb->data;
3209         struct nft_table *table;
3210         const struct nft_chain *chain;
3211         unsigned int idx = 0;
3212         struct net *net = sock_net(skb->sk);
3213         int family = nfmsg->nfgen_family;
3214         struct nftables_pernet *nft_net;
3215         bool reset = false;
3216
3217         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3218                 reset = true;
3219
3220         rcu_read_lock();
3221         nft_net = nft_pernet(net);
3222         cb->seq = READ_ONCE(nft_net->base_seq);
3223
3224         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3225                 if (family != NFPROTO_UNSPEC && family != table->family)
3226                         continue;
3227
3228                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3229                         continue;
3230
3231                 if (ctx && ctx->table && ctx->chain) {
3232                         struct rhlist_head *list, *tmp;
3233
3234                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3235                                                nft_chain_ht_params);
3236                         if (!list)
3237                                 goto done;
3238
3239                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3240                                 if (!nft_is_active(net, chain))
3241                                         continue;
3242                                 __nf_tables_dump_rules(skb, &idx,
3243                                                        cb, table, chain, reset);
3244                                 break;
3245                         }
3246                         goto done;
3247                 }
3248
3249                 list_for_each_entry_rcu(chain, &table->chains, list) {
3250                         if (__nf_tables_dump_rules(skb, &idx,
3251                                                    cb, table, chain, reset))
3252                                 goto done;
3253                 }
3254
3255                 if (ctx && ctx->table)
3256                         break;
3257         }
3258 done:
3259         rcu_read_unlock();
3260
3261         cb->args[0] = idx;
3262         return skb->len;
3263 }
3264
3265 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3266 {
3267         const struct nlattr * const *nla = cb->data;
3268         struct nft_rule_dump_ctx *ctx = NULL;
3269
3270         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3271                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3272                 if (!ctx)
3273                         return -ENOMEM;
3274
3275                 if (nla[NFTA_RULE_TABLE]) {
3276                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3277                                                         GFP_ATOMIC);
3278                         if (!ctx->table) {
3279                                 kfree(ctx);
3280                                 return -ENOMEM;
3281                         }
3282                 }
3283                 if (nla[NFTA_RULE_CHAIN]) {
3284                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3285                                                 GFP_ATOMIC);
3286                         if (!ctx->chain) {
3287                                 kfree(ctx->table);
3288                                 kfree(ctx);
3289                                 return -ENOMEM;
3290                         }
3291                 }
3292         }
3293
3294         cb->data = ctx;
3295         return 0;
3296 }
3297
3298 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3299 {
3300         struct nft_rule_dump_ctx *ctx = cb->data;
3301
3302         if (ctx) {
3303                 kfree(ctx->table);
3304                 kfree(ctx->chain);
3305                 kfree(ctx);
3306         }
3307         return 0;
3308 }
3309
3310 /* called with rcu_read_lock held */
3311 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3312                              const struct nlattr * const nla[])
3313 {
3314         struct netlink_ext_ack *extack = info->extack;
3315         u8 genmask = nft_genmask_cur(info->net);
3316         u8 family = info->nfmsg->nfgen_family;
3317         const struct nft_chain *chain;
3318         const struct nft_rule *rule;
3319         struct net *net = info->net;
3320         struct nft_table *table;
3321         struct sk_buff *skb2;
3322         bool reset = false;
3323         int err;
3324
3325         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3326                 struct netlink_dump_control c = {
3327                         .start= nf_tables_dump_rules_start,
3328                         .dump = nf_tables_dump_rules,
3329                         .done = nf_tables_dump_rules_done,
3330                         .module = THIS_MODULE,
3331                         .data = (void *)nla,
3332                 };
3333
3334                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3335         }
3336
3337         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3338         if (IS_ERR(table)) {
3339                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3340                 return PTR_ERR(table);
3341         }
3342
3343         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3344         if (IS_ERR(chain)) {
3345                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3346                 return PTR_ERR(chain);
3347         }
3348
3349         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3350         if (IS_ERR(rule)) {
3351                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3352                 return PTR_ERR(rule);
3353         }
3354
3355         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3356         if (!skb2)
3357                 return -ENOMEM;
3358
3359         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3360                 reset = true;
3361
3362         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3363                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3364                                        family, table, chain, rule, 0, reset);
3365         if (err < 0)
3366                 goto err_fill_rule_info;
3367
3368         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3369
3370 err_fill_rule_info:
3371         kfree_skb(skb2);
3372         return err;
3373 }
3374
3375 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3376                                    struct nft_rule *rule)
3377 {
3378         struct nft_expr *expr, *next;
3379
3380         /*
3381          * Careful: some expressions might not be initialized in case this
3382          * is called on error from nf_tables_newrule().
3383          */
3384         expr = nft_expr_first(rule);
3385         while (nft_expr_more(rule, expr)) {
3386                 next = nft_expr_next(expr);
3387                 nf_tables_expr_destroy(ctx, expr);
3388                 expr = next;
3389         }
3390         kfree(rule);
3391 }
3392
3393 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3394 {
3395         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3396         nf_tables_rule_destroy(ctx, rule);
3397 }
3398
3399 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3400 {
3401         struct nft_expr *expr, *last;
3402         const struct nft_data *data;
3403         struct nft_rule *rule;
3404         int err;
3405
3406         if (ctx->level == NFT_JUMP_STACK_SIZE)
3407                 return -EMLINK;
3408
3409         list_for_each_entry(rule, &chain->rules, list) {
3410                 if (!nft_is_active_next(ctx->net, rule))
3411                         continue;
3412
3413                 nft_rule_for_each_expr(expr, last, rule) {
3414                         if (!expr->ops->validate)
3415                                 continue;
3416
3417                         err = expr->ops->validate(ctx, expr, &data);
3418                         if (err < 0)
3419                                 return err;
3420                 }
3421
3422                 cond_resched();
3423         }
3424
3425         return 0;
3426 }
3427 EXPORT_SYMBOL_GPL(nft_chain_validate);
3428
3429 static int nft_table_validate(struct net *net, const struct nft_table *table)
3430 {
3431         struct nft_chain *chain;
3432         struct nft_ctx ctx = {
3433                 .net    = net,
3434                 .family = table->family,
3435         };
3436         int err;
3437
3438         list_for_each_entry(chain, &table->chains, list) {
3439                 if (!nft_is_base_chain(chain))
3440                         continue;
3441
3442                 ctx.chain = chain;
3443                 err = nft_chain_validate(&ctx, chain);
3444                 if (err < 0)
3445                         return err;
3446         }
3447
3448         return 0;
3449 }
3450
3451 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3452                          const struct nft_set_iter *iter,
3453                          struct nft_set_elem *elem)
3454 {
3455         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3456         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3457         const struct nft_data *data;
3458         int err;
3459
3460         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3461             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3462                 return 0;
3463
3464         data = nft_set_ext_data(ext);
3465         switch (data->verdict.code) {
3466         case NFT_JUMP:
3467         case NFT_GOTO:
3468                 pctx->level++;
3469                 err = nft_chain_validate(ctx, data->verdict.chain);
3470                 if (err < 0)
3471                         return err;
3472                 pctx->level--;
3473                 break;
3474         default:
3475                 break;
3476         }
3477
3478         return 0;
3479 }
3480
3481 struct nft_set_elem_catchall {
3482         struct list_head        list;
3483         struct rcu_head         rcu;
3484         void                    *elem;
3485 };
3486
3487 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3488 {
3489         u8 genmask = nft_genmask_next(ctx->net);
3490         struct nft_set_elem_catchall *catchall;
3491         struct nft_set_elem elem;
3492         struct nft_set_ext *ext;
3493         int ret = 0;
3494
3495         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3496                 ext = nft_set_elem_ext(set, catchall->elem);
3497                 if (!nft_set_elem_active(ext, genmask))
3498                         continue;
3499
3500                 elem.priv = catchall->elem;
3501                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3502                 if (ret < 0)
3503                         return ret;
3504         }
3505
3506         return ret;
3507 }
3508
3509 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3510                                              const struct nft_chain *chain,
3511                                              const struct nlattr *nla);
3512
3513 #define NFT_RULE_MAXEXPRS       128
3514
3515 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3516                              const struct nlattr * const nla[])
3517 {
3518         struct nftables_pernet *nft_net = nft_pernet(info->net);
3519         struct netlink_ext_ack *extack = info->extack;
3520         unsigned int size, i, n, ulen = 0, usize = 0;
3521         u8 genmask = nft_genmask_next(info->net);
3522         struct nft_rule *rule, *old_rule = NULL;
3523         struct nft_expr_info *expr_info = NULL;
3524         u8 family = info->nfmsg->nfgen_family;
3525         struct nft_flow_rule *flow = NULL;
3526         struct net *net = info->net;
3527         struct nft_userdata *udata;
3528         struct nft_table *table;
3529         struct nft_chain *chain;
3530         struct nft_trans *trans;
3531         u64 handle, pos_handle;
3532         struct nft_expr *expr;
3533         struct nft_ctx ctx;
3534         struct nlattr *tmp;
3535         int err, rem;
3536
3537         lockdep_assert_held(&nft_net->commit_mutex);
3538
3539         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3540                                  NETLINK_CB(skb).portid);
3541         if (IS_ERR(table)) {
3542                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3543                 return PTR_ERR(table);
3544         }
3545
3546         if (nla[NFTA_RULE_CHAIN]) {
3547                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3548                                          genmask);
3549                 if (IS_ERR(chain)) {
3550                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3551                         return PTR_ERR(chain);
3552                 }
3553                 if (nft_chain_is_bound(chain))
3554                         return -EOPNOTSUPP;
3555
3556         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3557                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3558                 if (IS_ERR(chain)) {
3559                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3560                         return PTR_ERR(chain);
3561                 }
3562         } else {
3563                 return -EINVAL;
3564         }
3565
3566         if (nla[NFTA_RULE_HANDLE]) {
3567                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3568                 rule = __nft_rule_lookup(chain, handle);
3569                 if (IS_ERR(rule)) {
3570                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3571                         return PTR_ERR(rule);
3572                 }
3573
3574                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3575                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3576                         return -EEXIST;
3577                 }
3578                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3579                         old_rule = rule;
3580                 else
3581                         return -EOPNOTSUPP;
3582         } else {
3583                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3584                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3585                         return -EINVAL;
3586                 handle = nf_tables_alloc_handle(table);
3587
3588                 if (chain->use == UINT_MAX)
3589                         return -EOVERFLOW;
3590
3591                 if (nla[NFTA_RULE_POSITION]) {
3592                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3593                         old_rule = __nft_rule_lookup(chain, pos_handle);
3594                         if (IS_ERR(old_rule)) {
3595                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3596                                 return PTR_ERR(old_rule);
3597                         }
3598                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3599                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3600                         if (IS_ERR(old_rule)) {
3601                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3602                                 return PTR_ERR(old_rule);
3603                         }
3604                 }
3605         }
3606
3607         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3608
3609         n = 0;
3610         size = 0;
3611         if (nla[NFTA_RULE_EXPRESSIONS]) {
3612                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3613                                            sizeof(struct nft_expr_info),
3614                                            GFP_KERNEL);
3615                 if (!expr_info)
3616                         return -ENOMEM;
3617
3618                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3619                         err = -EINVAL;
3620                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3621                                 goto err_release_expr;
3622                         if (n == NFT_RULE_MAXEXPRS)
3623                                 goto err_release_expr;
3624                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3625                         if (err < 0) {
3626                                 NL_SET_BAD_ATTR(extack, tmp);
3627                                 goto err_release_expr;
3628                         }
3629                         size += expr_info[n].ops->size;
3630                         n++;
3631                 }
3632         }
3633         /* Check for overflow of dlen field */
3634         err = -EFBIG;
3635         if (size >= 1 << 12)
3636                 goto err_release_expr;
3637
3638         if (nla[NFTA_RULE_USERDATA]) {
3639                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3640                 if (ulen > 0)
3641                         usize = sizeof(struct nft_userdata) + ulen;
3642         }
3643
3644         err = -ENOMEM;
3645         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3646         if (rule == NULL)
3647                 goto err_release_expr;
3648
3649         nft_activate_next(net, rule);
3650
3651         rule->handle = handle;
3652         rule->dlen   = size;
3653         rule->udata  = ulen ? 1 : 0;
3654
3655         if (ulen) {
3656                 udata = nft_userdata(rule);
3657                 udata->len = ulen - 1;
3658                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3659         }
3660
3661         expr = nft_expr_first(rule);
3662         for (i = 0; i < n; i++) {
3663                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3664                 if (err < 0) {
3665                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3666                         goto err_release_rule;
3667                 }
3668
3669                 if (expr_info[i].ops->validate)
3670                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3671
3672                 expr_info[i].ops = NULL;
3673                 expr = nft_expr_next(expr);
3674         }
3675
3676         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3677                 flow = nft_flow_rule_create(net, rule);
3678                 if (IS_ERR(flow)) {
3679                         err = PTR_ERR(flow);
3680                         goto err_release_rule;
3681                 }
3682         }
3683
3684         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3685                 err = nft_delrule(&ctx, old_rule);
3686                 if (err < 0)
3687                         goto err_destroy_flow_rule;
3688
3689                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3690                 if (trans == NULL) {
3691                         err = -ENOMEM;
3692                         goto err_destroy_flow_rule;
3693                 }
3694                 list_add_tail_rcu(&rule->list, &old_rule->list);
3695         } else {
3696                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3697                 if (!trans) {
3698                         err = -ENOMEM;
3699                         goto err_destroy_flow_rule;
3700                 }
3701
3702                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3703                         if (old_rule)
3704                                 list_add_rcu(&rule->list, &old_rule->list);
3705                         else
3706                                 list_add_tail_rcu(&rule->list, &chain->rules);
3707                  } else {
3708                         if (old_rule)
3709                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3710                         else
3711                                 list_add_rcu(&rule->list, &chain->rules);
3712                 }
3713         }
3714         kvfree(expr_info);
3715         chain->use++;
3716
3717         if (flow)
3718                 nft_trans_flow_rule(trans) = flow;
3719
3720         if (nft_net->validate_state == NFT_VALIDATE_DO)
3721                 return nft_table_validate(net, table);
3722
3723         return 0;
3724
3725 err_destroy_flow_rule:
3726         if (flow)
3727                 nft_flow_rule_destroy(flow);
3728 err_release_rule:
3729         nf_tables_rule_release(&ctx, rule);
3730 err_release_expr:
3731         for (i = 0; i < n; i++) {
3732                 if (expr_info[i].ops) {
3733                         module_put(expr_info[i].ops->type->owner);
3734                         if (expr_info[i].ops->type->release_ops)
3735                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3736                 }
3737         }
3738         kvfree(expr_info);
3739
3740         return err;
3741 }
3742
3743 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3744                                              const struct nft_chain *chain,
3745                                              const struct nlattr *nla)
3746 {
3747         struct nftables_pernet *nft_net = nft_pernet(net);
3748         u32 id = ntohl(nla_get_be32(nla));
3749         struct nft_trans *trans;
3750
3751         list_for_each_entry(trans, &nft_net->commit_list, list) {
3752                 struct nft_rule *rule = nft_trans_rule(trans);
3753
3754                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3755                     trans->ctx.chain == chain &&
3756                     id == nft_trans_rule_id(trans))
3757                         return rule;
3758         }
3759         return ERR_PTR(-ENOENT);
3760 }
3761
3762 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3763                              const struct nlattr * const nla[])
3764 {
3765         struct netlink_ext_ack *extack = info->extack;
3766         u8 genmask = nft_genmask_next(info->net);
3767         u8 family = info->nfmsg->nfgen_family;
3768         struct nft_chain *chain = NULL;
3769         struct net *net = info->net;
3770         struct nft_table *table;
3771         struct nft_rule *rule;
3772         struct nft_ctx ctx;
3773         int err = 0;
3774
3775         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3776                                  NETLINK_CB(skb).portid);
3777         if (IS_ERR(table)) {
3778                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3779                 return PTR_ERR(table);
3780         }
3781
3782         if (nla[NFTA_RULE_CHAIN]) {
3783                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3784                                          genmask);
3785                 if (IS_ERR(chain)) {
3786                         if (PTR_ERR(chain) == -ENOENT &&
3787                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3788                                 return 0;
3789
3790                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3791                         return PTR_ERR(chain);
3792                 }
3793                 if (nft_chain_is_bound(chain))
3794                         return -EOPNOTSUPP;
3795         }
3796
3797         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3798
3799         if (chain) {
3800                 if (nla[NFTA_RULE_HANDLE]) {
3801                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3802                         if (IS_ERR(rule)) {
3803                                 if (PTR_ERR(rule) == -ENOENT &&
3804                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3805                                         return 0;
3806
3807                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3808                                 return PTR_ERR(rule);
3809                         }
3810
3811                         err = nft_delrule(&ctx, rule);
3812                 } else if (nla[NFTA_RULE_ID]) {
3813                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3814                         if (IS_ERR(rule)) {
3815                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3816                                 return PTR_ERR(rule);
3817                         }
3818
3819                         err = nft_delrule(&ctx, rule);
3820                 } else {
3821                         err = nft_delrule_by_chain(&ctx);
3822                 }
3823         } else {
3824                 list_for_each_entry(chain, &table->chains, list) {
3825                         if (!nft_is_active_next(net, chain))
3826                                 continue;
3827
3828                         ctx.chain = chain;
3829                         err = nft_delrule_by_chain(&ctx);
3830                         if (err < 0)
3831                                 break;
3832                 }
3833         }
3834
3835         return err;
3836 }
3837
3838 /*
3839  * Sets
3840  */
3841 static const struct nft_set_type *nft_set_types[] = {
3842         &nft_set_hash_fast_type,
3843         &nft_set_hash_type,
3844         &nft_set_rhash_type,
3845         &nft_set_bitmap_type,
3846         &nft_set_rbtree_type,
3847 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3848         &nft_set_pipapo_avx2_type,
3849 #endif
3850         &nft_set_pipapo_type,
3851 };
3852
3853 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3854                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3855                                  NFT_SET_EVAL)
3856
3857 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3858 {
3859         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3860 }
3861
3862 /*
3863  * Select a set implementation based on the data characteristics and the
3864  * given policy. The total memory use might not be known if no size is
3865  * given, in that case the amount of memory per element is used.
3866  */
3867 static const struct nft_set_ops *
3868 nft_select_set_ops(const struct nft_ctx *ctx,
3869                    const struct nlattr * const nla[],
3870                    const struct nft_set_desc *desc)
3871 {
3872         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3873         const struct nft_set_ops *ops, *bops;
3874         struct nft_set_estimate est, best;
3875         const struct nft_set_type *type;
3876         u32 flags = 0;
3877         int i;
3878
3879         lockdep_assert_held(&nft_net->commit_mutex);
3880         lockdep_nfnl_nft_mutex_not_held();
3881
3882         if (nla[NFTA_SET_FLAGS] != NULL)
3883                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3884
3885         bops        = NULL;
3886         best.size   = ~0;
3887         best.lookup = ~0;
3888         best.space  = ~0;
3889
3890         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3891                 type = nft_set_types[i];
3892                 ops = &type->ops;
3893
3894                 if (!nft_set_ops_candidate(type, flags))
3895                         continue;
3896                 if (!ops->estimate(desc, flags, &est))
3897                         continue;
3898
3899                 switch (desc->policy) {
3900                 case NFT_SET_POL_PERFORMANCE:
3901                         if (est.lookup < best.lookup)
3902                                 break;
3903                         if (est.lookup == best.lookup &&
3904                             est.space < best.space)
3905                                 break;
3906                         continue;
3907                 case NFT_SET_POL_MEMORY:
3908                         if (!desc->size) {
3909                                 if (est.space < best.space)
3910                                         break;
3911                                 if (est.space == best.space &&
3912                                     est.lookup < best.lookup)
3913                                         break;
3914                         } else if (est.size < best.size || !bops) {
3915                                 break;
3916                         }
3917                         continue;
3918                 default:
3919                         break;
3920                 }
3921
3922                 bops = ops;
3923                 best = est;
3924         }
3925
3926         if (bops != NULL)
3927                 return bops;
3928
3929         return ERR_PTR(-EOPNOTSUPP);
3930 }
3931
3932 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3933         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3934                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3935         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3936                                             .len = NFT_SET_MAXNAMELEN - 1 },
3937         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3938         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3939         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3940         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3941         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3942         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3943         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3944         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3945         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3946         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3947         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3948                                             .len  = NFT_USERDATA_MAXLEN },
3949         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3950         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3951         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3952         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3953 };
3954
3955 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3956         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3957         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3958 };
3959
3960 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3961                                       const struct nlattr *nla, u8 genmask)
3962 {
3963         struct nft_set *set;
3964
3965         if (nla == NULL)
3966                 return ERR_PTR(-EINVAL);
3967
3968         list_for_each_entry_rcu(set, &table->sets, list) {
3969                 if (!nla_strcmp(nla, set->name) &&
3970                     nft_active_genmask(set, genmask))
3971                         return set;
3972         }
3973         return ERR_PTR(-ENOENT);
3974 }
3975
3976 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3977                                                const struct nlattr *nla,
3978                                                u8 genmask)
3979 {
3980         struct nft_set *set;
3981
3982         list_for_each_entry(set, &table->sets, list) {
3983                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3984                     nft_active_genmask(set, genmask))
3985                         return set;
3986         }
3987         return ERR_PTR(-ENOENT);
3988 }
3989
3990 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3991                                            const struct nft_table *table,
3992                                            const struct nlattr *nla, u8 genmask)
3993 {
3994         struct nftables_pernet *nft_net = nft_pernet(net);
3995         u32 id = ntohl(nla_get_be32(nla));
3996         struct nft_trans *trans;
3997
3998         list_for_each_entry(trans, &nft_net->commit_list, list) {
3999                 if (trans->msg_type == NFT_MSG_NEWSET) {
4000                         struct nft_set *set = nft_trans_set(trans);
4001
4002                         if (id == nft_trans_set_id(trans) &&
4003                             set->table == table &&
4004                             nft_active_genmask(set, genmask))
4005                                 return set;
4006                 }
4007         }
4008         return ERR_PTR(-ENOENT);
4009 }
4010
4011 struct nft_set *nft_set_lookup_global(const struct net *net,
4012                                       const struct nft_table *table,
4013                                       const struct nlattr *nla_set_name,
4014                                       const struct nlattr *nla_set_id,
4015                                       u8 genmask)
4016 {
4017         struct nft_set *set;
4018
4019         set = nft_set_lookup(table, nla_set_name, genmask);
4020         if (IS_ERR(set)) {
4021                 if (!nla_set_id)
4022                         return set;
4023
4024                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4025         }
4026         return set;
4027 }
4028 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4029
4030 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4031                                     const char *name)
4032 {
4033         const struct nft_set *i;
4034         const char *p;
4035         unsigned long *inuse;
4036         unsigned int n = 0, min = 0;
4037
4038         p = strchr(name, '%');
4039         if (p != NULL) {
4040                 if (p[1] != 'd' || strchr(p + 2, '%'))
4041                         return -EINVAL;
4042
4043                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4044                 if (inuse == NULL)
4045                         return -ENOMEM;
4046 cont:
4047                 list_for_each_entry(i, &ctx->table->sets, list) {
4048                         int tmp;
4049
4050                         if (!nft_is_active_next(ctx->net, i))
4051                                 continue;
4052                         if (!sscanf(i->name, name, &tmp))
4053                                 continue;
4054                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4055                                 continue;
4056
4057                         set_bit(tmp - min, inuse);
4058                 }
4059
4060                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4061                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4062                         min += BITS_PER_BYTE * PAGE_SIZE;
4063                         memset(inuse, 0, PAGE_SIZE);
4064                         goto cont;
4065                 }
4066                 free_page((unsigned long)inuse);
4067         }
4068
4069         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4070         if (!set->name)
4071                 return -ENOMEM;
4072
4073         list_for_each_entry(i, &ctx->table->sets, list) {
4074                 if (!nft_is_active_next(ctx->net, i))
4075                         continue;
4076                 if (!strcmp(set->name, i->name)) {
4077                         kfree(set->name);
4078                         set->name = NULL;
4079                         return -ENFILE;
4080                 }
4081         }
4082         return 0;
4083 }
4084
4085 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4086 {
4087         u64 ms = be64_to_cpu(nla_get_be64(nla));
4088         u64 max = (u64)(~((u64)0));
4089
4090         max = div_u64(max, NSEC_PER_MSEC);
4091         if (ms >= max)
4092                 return -ERANGE;
4093
4094         ms *= NSEC_PER_MSEC;
4095         *result = nsecs_to_jiffies64(ms);
4096         return 0;
4097 }
4098
4099 __be64 nf_jiffies64_to_msecs(u64 input)
4100 {
4101         return cpu_to_be64(jiffies64_to_msecs(input));
4102 }
4103
4104 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4105                                      const struct nft_set *set)
4106 {
4107         struct nlattr *concat, *field;
4108         int i;
4109
4110         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4111         if (!concat)
4112                 return -ENOMEM;
4113
4114         for (i = 0; i < set->field_count; i++) {
4115                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4116                 if (!field)
4117                         return -ENOMEM;
4118
4119                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4120                                  htonl(set->field_len[i])))
4121                         return -ENOMEM;
4122
4123                 nla_nest_end(skb, field);
4124         }
4125
4126         nla_nest_end(skb, concat);
4127
4128         return 0;
4129 }
4130
4131 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4132                               const struct nft_set *set, u16 event, u16 flags)
4133 {
4134         u64 timeout = READ_ONCE(set->timeout);
4135         u32 gc_int = READ_ONCE(set->gc_int);
4136         u32 portid = ctx->portid;
4137         struct nlmsghdr *nlh;
4138         struct nlattr *nest;
4139         u32 seq = ctx->seq;
4140         int i;
4141
4142         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4143         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4144                            NFNETLINK_V0, nft_base_seq(ctx->net));
4145         if (!nlh)
4146                 goto nla_put_failure;
4147
4148         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4149                 goto nla_put_failure;
4150         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4151                 goto nla_put_failure;
4152         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4153                          NFTA_SET_PAD))
4154                 goto nla_put_failure;
4155         if (set->flags != 0)
4156                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4157                         goto nla_put_failure;
4158
4159         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4160                 goto nla_put_failure;
4161         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4162                 goto nla_put_failure;
4163         if (set->flags & NFT_SET_MAP) {
4164                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4165                         goto nla_put_failure;
4166                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4167                         goto nla_put_failure;
4168         }
4169         if (set->flags & NFT_SET_OBJECT &&
4170             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4171                 goto nla_put_failure;
4172
4173         if (timeout &&
4174             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4175                          nf_jiffies64_to_msecs(timeout),
4176                          NFTA_SET_PAD))
4177                 goto nla_put_failure;
4178         if (gc_int &&
4179             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4180                 goto nla_put_failure;
4181
4182         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4183                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4184                         goto nla_put_failure;
4185         }
4186
4187         if (set->udata &&
4188             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4189                 goto nla_put_failure;
4190
4191         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4192         if (!nest)
4193                 goto nla_put_failure;
4194         if (set->size &&
4195             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4196                 goto nla_put_failure;
4197
4198         if (set->field_count > 1 &&
4199             nf_tables_fill_set_concat(skb, set))
4200                 goto nla_put_failure;
4201
4202         nla_nest_end(skb, nest);
4203
4204         if (set->num_exprs == 1) {
4205                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4206                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4207                         goto nla_put_failure;
4208
4209                 nla_nest_end(skb, nest);
4210         } else if (set->num_exprs > 1) {
4211                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4212                 if (nest == NULL)
4213                         goto nla_put_failure;
4214
4215                 for (i = 0; i < set->num_exprs; i++) {
4216                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4217                                           set->exprs[i], false) < 0)
4218                                 goto nla_put_failure;
4219                 }
4220                 nla_nest_end(skb, nest);
4221         }
4222
4223         nlmsg_end(skb, nlh);
4224         return 0;
4225
4226 nla_put_failure:
4227         nlmsg_trim(skb, nlh);
4228         return -1;
4229 }
4230
4231 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4232                                  const struct nft_set *set, int event,
4233                                  gfp_t gfp_flags)
4234 {
4235         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4236         u32 portid = ctx->portid;
4237         struct sk_buff *skb;
4238         u16 flags = 0;
4239         int err;
4240
4241         if (!ctx->report &&
4242             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4243                 return;
4244
4245         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4246         if (skb == NULL)
4247                 goto err;
4248
4249         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4250                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4251
4252         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4253         if (err < 0) {
4254                 kfree_skb(skb);
4255                 goto err;
4256         }
4257
4258         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4259         return;
4260 err:
4261         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4262 }
4263
4264 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4265 {
4266         const struct nft_set *set;
4267         unsigned int idx, s_idx = cb->args[0];
4268         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4269         struct net *net = sock_net(skb->sk);
4270         struct nft_ctx *ctx = cb->data, ctx_set;
4271         struct nftables_pernet *nft_net;
4272
4273         if (cb->args[1])
4274                 return skb->len;
4275
4276         rcu_read_lock();
4277         nft_net = nft_pernet(net);
4278         cb->seq = READ_ONCE(nft_net->base_seq);
4279
4280         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4281                 if (ctx->family != NFPROTO_UNSPEC &&
4282                     ctx->family != table->family)
4283                         continue;
4284
4285                 if (ctx->table && ctx->table != table)
4286                         continue;
4287
4288                 if (cur_table) {
4289                         if (cur_table != table)
4290                                 continue;
4291
4292                         cur_table = NULL;
4293                 }
4294                 idx = 0;
4295                 list_for_each_entry_rcu(set, &table->sets, list) {
4296                         if (idx < s_idx)
4297                                 goto cont;
4298                         if (!nft_is_active(net, set))
4299                                 goto cont;
4300
4301                         ctx_set = *ctx;
4302                         ctx_set.table = table;
4303                         ctx_set.family = table->family;
4304
4305                         if (nf_tables_fill_set(skb, &ctx_set, set,
4306                                                NFT_MSG_NEWSET,
4307                                                NLM_F_MULTI) < 0) {
4308                                 cb->args[0] = idx;
4309                                 cb->args[2] = (unsigned long) table;
4310                                 goto done;
4311                         }
4312                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4313 cont:
4314                         idx++;
4315                 }
4316                 if (s_idx)
4317                         s_idx = 0;
4318         }
4319         cb->args[1] = 1;
4320 done:
4321         rcu_read_unlock();
4322         return skb->len;
4323 }
4324
4325 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4326 {
4327         struct nft_ctx *ctx_dump = NULL;
4328
4329         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4330         if (ctx_dump == NULL)
4331                 return -ENOMEM;
4332
4333         cb->data = ctx_dump;
4334         return 0;
4335 }
4336
4337 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4338 {
4339         kfree(cb->data);
4340         return 0;
4341 }
4342
4343 /* called with rcu_read_lock held */
4344 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4345                             const struct nlattr * const nla[])
4346 {
4347         struct netlink_ext_ack *extack = info->extack;
4348         u8 genmask = nft_genmask_cur(info->net);
4349         u8 family = info->nfmsg->nfgen_family;
4350         struct nft_table *table = NULL;
4351         struct net *net = info->net;
4352         const struct nft_set *set;
4353         struct sk_buff *skb2;
4354         struct nft_ctx ctx;
4355         int err;
4356
4357         if (nla[NFTA_SET_TABLE]) {
4358                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4359                                          genmask, 0);
4360                 if (IS_ERR(table)) {
4361                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4362                         return PTR_ERR(table);
4363                 }
4364         }
4365
4366         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4367
4368         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4369                 struct netlink_dump_control c = {
4370                         .start = nf_tables_dump_sets_start,
4371                         .dump = nf_tables_dump_sets,
4372                         .done = nf_tables_dump_sets_done,
4373                         .data = &ctx,
4374                         .module = THIS_MODULE,
4375                 };
4376
4377                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4378         }
4379
4380         /* Only accept unspec with dump */
4381         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4382                 return -EAFNOSUPPORT;
4383         if (!nla[NFTA_SET_TABLE])
4384                 return -EINVAL;
4385
4386         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4387         if (IS_ERR(set))
4388                 return PTR_ERR(set);
4389
4390         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4391         if (skb2 == NULL)
4392                 return -ENOMEM;
4393
4394         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4395         if (err < 0)
4396                 goto err_fill_set_info;
4397
4398         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4399
4400 err_fill_set_info:
4401         kfree_skb(skb2);
4402         return err;
4403 }
4404
4405 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4406         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4407 };
4408
4409 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4410                                      struct nft_set_desc *desc)
4411 {
4412         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4413         u32 len;
4414         int err;
4415
4416         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4417                 return -E2BIG;
4418
4419         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4420                                           nft_concat_policy, NULL);
4421         if (err < 0)
4422                 return err;
4423
4424         if (!tb[NFTA_SET_FIELD_LEN])
4425                 return -EINVAL;
4426
4427         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4428         if (!len || len > U8_MAX)
4429                 return -EINVAL;
4430
4431         desc->field_len[desc->field_count++] = len;
4432
4433         return 0;
4434 }
4435
4436 static int nft_set_desc_concat(struct nft_set_desc *desc,
4437                                const struct nlattr *nla)
4438 {
4439         struct nlattr *attr;
4440         u32 num_regs = 0;
4441         int rem, err, i;
4442
4443         nla_for_each_nested(attr, nla, rem) {
4444                 if (nla_type(attr) != NFTA_LIST_ELEM)
4445                         return -EINVAL;
4446
4447                 err = nft_set_desc_concat_parse(attr, desc);
4448                 if (err < 0)
4449                         return err;
4450         }
4451
4452         for (i = 0; i < desc->field_count; i++)
4453                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4454
4455         if (num_regs > NFT_REG32_COUNT)
4456                 return -E2BIG;
4457
4458         return 0;
4459 }
4460
4461 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4462                                     const struct nlattr *nla)
4463 {
4464         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4465         int err;
4466
4467         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4468                                           nft_set_desc_policy, NULL);
4469         if (err < 0)
4470                 return err;
4471
4472         if (da[NFTA_SET_DESC_SIZE] != NULL)
4473                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4474         if (da[NFTA_SET_DESC_CONCAT])
4475                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4476
4477         return err;
4478 }
4479
4480 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4481                               const struct nlattr * const *nla,
4482                               struct nft_expr **exprs, int *num_exprs,
4483                               u32 flags)
4484 {
4485         struct nft_expr *expr;
4486         int err, i;
4487
4488         if (nla[NFTA_SET_EXPR]) {
4489                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4490                 if (IS_ERR(expr)) {
4491                         err = PTR_ERR(expr);
4492                         goto err_set_expr_alloc;
4493                 }
4494                 exprs[0] = expr;
4495                 (*num_exprs)++;
4496         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4497                 struct nlattr *tmp;
4498                 int left;
4499
4500                 if (!(flags & NFT_SET_EXPR)) {
4501                         err = -EINVAL;
4502                         goto err_set_expr_alloc;
4503                 }
4504                 i = 0;
4505                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4506                         if (i == NFT_SET_EXPR_MAX) {
4507                                 err = -E2BIG;
4508                                 goto err_set_expr_alloc;
4509                         }
4510                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4511                                 err = -EINVAL;
4512                                 goto err_set_expr_alloc;
4513                         }
4514                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4515                         if (IS_ERR(expr)) {
4516                                 err = PTR_ERR(expr);
4517                                 goto err_set_expr_alloc;
4518                         }
4519                         exprs[i++] = expr;
4520                         (*num_exprs)++;
4521                 }
4522         }
4523
4524         return 0;
4525
4526 err_set_expr_alloc:
4527         for (i = 0; i < *num_exprs; i++)
4528                 nft_expr_destroy(ctx, exprs[i]);
4529
4530         return err;
4531 }
4532
4533 static bool nft_set_is_same(const struct nft_set *set,
4534                             const struct nft_set_desc *desc,
4535                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4536 {
4537         int i;
4538
4539         if (set->ktype != desc->ktype ||
4540             set->dtype != desc->dtype ||
4541             set->flags != flags ||
4542             set->klen != desc->klen ||
4543             set->dlen != desc->dlen ||
4544             set->field_count != desc->field_count ||
4545             set->num_exprs != num_exprs)
4546                 return false;
4547
4548         for (i = 0; i < desc->field_count; i++) {
4549                 if (set->field_len[i] != desc->field_len[i])
4550                         return false;
4551         }
4552
4553         for (i = 0; i < num_exprs; i++) {
4554                 if (set->exprs[i]->ops != exprs[i]->ops)
4555                         return false;
4556         }
4557
4558         return true;
4559 }
4560
4561 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4562                             const struct nlattr * const nla[])
4563 {
4564         struct netlink_ext_ack *extack = info->extack;
4565         u8 genmask = nft_genmask_next(info->net);
4566         u8 family = info->nfmsg->nfgen_family;
4567         const struct nft_set_ops *ops;
4568         struct net *net = info->net;
4569         struct nft_set_desc desc;
4570         struct nft_table *table;
4571         unsigned char *udata;
4572         struct nft_set *set;
4573         struct nft_ctx ctx;
4574         size_t alloc_size;
4575         int num_exprs = 0;
4576         char *name;
4577         int err, i;
4578         u16 udlen;
4579         u32 flags;
4580         u64 size;
4581
4582         if (nla[NFTA_SET_TABLE] == NULL ||
4583             nla[NFTA_SET_NAME] == NULL ||
4584             nla[NFTA_SET_KEY_LEN] == NULL ||
4585             nla[NFTA_SET_ID] == NULL)
4586                 return -EINVAL;
4587
4588         memset(&desc, 0, sizeof(desc));
4589
4590         desc.ktype = NFT_DATA_VALUE;
4591         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4592                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4593                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4594                         return -EINVAL;
4595         }
4596
4597         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4598         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4599                 return -EINVAL;
4600
4601         flags = 0;
4602         if (nla[NFTA_SET_FLAGS] != NULL) {
4603                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4604                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4605                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4606                               NFT_SET_MAP | NFT_SET_EVAL |
4607                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4608                         return -EOPNOTSUPP;
4609                 /* Only one of these operations is supported */
4610                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4611                              (NFT_SET_MAP | NFT_SET_OBJECT))
4612                         return -EOPNOTSUPP;
4613                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4614                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4615                         return -EOPNOTSUPP;
4616         }
4617
4618         desc.dtype = 0;
4619         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4620                 if (!(flags & NFT_SET_MAP))
4621                         return -EINVAL;
4622
4623                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4624                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4625                     desc.dtype != NFT_DATA_VERDICT)
4626                         return -EINVAL;
4627
4628                 if (desc.dtype != NFT_DATA_VERDICT) {
4629                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4630                                 return -EINVAL;
4631                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4632                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4633                                 return -EINVAL;
4634                 } else
4635                         desc.dlen = sizeof(struct nft_verdict);
4636         } else if (flags & NFT_SET_MAP)
4637                 return -EINVAL;
4638
4639         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4640                 if (!(flags & NFT_SET_OBJECT))
4641                         return -EINVAL;
4642
4643                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4644                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4645                     desc.objtype > NFT_OBJECT_MAX)
4646                         return -EOPNOTSUPP;
4647         } else if (flags & NFT_SET_OBJECT)
4648                 return -EINVAL;
4649         else
4650                 desc.objtype = NFT_OBJECT_UNSPEC;
4651
4652         desc.timeout = 0;
4653         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4654                 if (!(flags & NFT_SET_TIMEOUT))
4655                         return -EINVAL;
4656
4657                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4658                 if (err)
4659                         return err;
4660         }
4661         desc.gc_int = 0;
4662         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4663                 if (!(flags & NFT_SET_TIMEOUT))
4664                         return -EINVAL;
4665                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4666         }
4667
4668         desc.policy = NFT_SET_POL_PERFORMANCE;
4669         if (nla[NFTA_SET_POLICY] != NULL)
4670                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4671
4672         if (nla[NFTA_SET_DESC] != NULL) {
4673                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4674                 if (err < 0)
4675                         return err;
4676
4677                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4678                         return -EINVAL;
4679         } else if (flags & NFT_SET_CONCAT) {
4680                 return -EINVAL;
4681         }
4682
4683         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4684                 desc.expr = true;
4685
4686         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4687                                  NETLINK_CB(skb).portid);
4688         if (IS_ERR(table)) {
4689                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4690                 return PTR_ERR(table);
4691         }
4692
4693         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4694
4695         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4696         if (IS_ERR(set)) {
4697                 if (PTR_ERR(set) != -ENOENT) {
4698                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4699                         return PTR_ERR(set);
4700                 }
4701         } else {
4702                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4703
4704                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4705                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4706                         return -EEXIST;
4707                 }
4708                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4709                         return -EOPNOTSUPP;
4710
4711                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4712                 if (err < 0)
4713                         return err;
4714
4715                 err = 0;
4716                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4717                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4718                         err = -EEXIST;
4719                 }
4720
4721                 for (i = 0; i < num_exprs; i++)
4722                         nft_expr_destroy(&ctx, exprs[i]);
4723
4724                 if (err < 0)
4725                         return err;
4726
4727                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4728         }
4729
4730         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4731                 return -ENOENT;
4732
4733         ops = nft_select_set_ops(&ctx, nla, &desc);
4734         if (IS_ERR(ops))
4735                 return PTR_ERR(ops);
4736
4737         udlen = 0;
4738         if (nla[NFTA_SET_USERDATA])
4739                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4740
4741         size = 0;
4742         if (ops->privsize != NULL)
4743                 size = ops->privsize(nla, &desc);
4744         alloc_size = sizeof(*set) + size + udlen;
4745         if (alloc_size < size || alloc_size > INT_MAX)
4746                 return -ENOMEM;
4747         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4748         if (!set)
4749                 return -ENOMEM;
4750
4751         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4752         if (!name) {
4753                 err = -ENOMEM;
4754                 goto err_set_name;
4755         }
4756
4757         err = nf_tables_set_alloc_name(&ctx, set, name);
4758         kfree(name);
4759         if (err < 0)
4760                 goto err_set_name;
4761
4762         udata = NULL;
4763         if (udlen) {
4764                 udata = set->data + size;
4765                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4766         }
4767
4768         INIT_LIST_HEAD(&set->bindings);
4769         INIT_LIST_HEAD(&set->catchall_list);
4770         set->table = table;
4771         write_pnet(&set->net, net);
4772         set->ops = ops;
4773         set->ktype = desc.ktype;
4774         set->klen = desc.klen;
4775         set->dtype = desc.dtype;
4776         set->objtype = desc.objtype;
4777         set->dlen = desc.dlen;
4778         set->flags = flags;
4779         set->size = desc.size;
4780         set->policy = desc.policy;
4781         set->udlen = udlen;
4782         set->udata = udata;
4783         set->timeout = desc.timeout;
4784         set->gc_int = desc.gc_int;
4785
4786         set->field_count = desc.field_count;
4787         for (i = 0; i < desc.field_count; i++)
4788                 set->field_len[i] = desc.field_len[i];
4789
4790         err = ops->init(set, &desc, nla);
4791         if (err < 0)
4792                 goto err_set_init;
4793
4794         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4795         if (err < 0)
4796                 goto err_set_destroy;
4797
4798         set->num_exprs = num_exprs;
4799         set->handle = nf_tables_alloc_handle(table);
4800
4801         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4802         if (err < 0)
4803                 goto err_set_expr_alloc;
4804
4805         list_add_tail_rcu(&set->list, &table->sets);
4806         table->use++;
4807         return 0;
4808
4809 err_set_expr_alloc:
4810         for (i = 0; i < set->num_exprs; i++)
4811                 nft_expr_destroy(&ctx, set->exprs[i]);
4812 err_set_destroy:
4813         ops->destroy(set);
4814 err_set_init:
4815         kfree(set->name);
4816 err_set_name:
4817         kvfree(set);
4818         return err;
4819 }
4820
4821 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4822                                      struct nft_set *set)
4823 {
4824         struct nft_set_elem_catchall *next, *catchall;
4825
4826         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4827                 list_del_rcu(&catchall->list);
4828                 nft_set_elem_destroy(set, catchall->elem, true);
4829                 kfree_rcu(catchall, rcu);
4830         }
4831 }
4832
4833 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4834 {
4835         int i;
4836
4837         if (WARN_ON(set->use > 0))
4838                 return;
4839
4840         for (i = 0; i < set->num_exprs; i++)
4841                 nft_expr_destroy(ctx, set->exprs[i]);
4842
4843         set->ops->destroy(set);
4844         nft_set_catchall_destroy(ctx, set);
4845         kfree(set->name);
4846         kvfree(set);
4847 }
4848
4849 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4850                             const struct nlattr * const nla[])
4851 {
4852         struct netlink_ext_ack *extack = info->extack;
4853         u8 genmask = nft_genmask_next(info->net);
4854         u8 family = info->nfmsg->nfgen_family;
4855         struct net *net = info->net;
4856         const struct nlattr *attr;
4857         struct nft_table *table;
4858         struct nft_set *set;
4859         struct nft_ctx ctx;
4860
4861         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4862                 return -EAFNOSUPPORT;
4863
4864         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4865                                  genmask, NETLINK_CB(skb).portid);
4866         if (IS_ERR(table)) {
4867                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4868                 return PTR_ERR(table);
4869         }
4870
4871         if (nla[NFTA_SET_HANDLE]) {
4872                 attr = nla[NFTA_SET_HANDLE];
4873                 set = nft_set_lookup_byhandle(table, attr, genmask);
4874         } else {
4875                 attr = nla[NFTA_SET_NAME];
4876                 set = nft_set_lookup(table, attr, genmask);
4877         }
4878
4879         if (IS_ERR(set)) {
4880                 if (PTR_ERR(set) == -ENOENT &&
4881                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
4882                         return 0;
4883
4884                 NL_SET_BAD_ATTR(extack, attr);
4885                 return PTR_ERR(set);
4886         }
4887         if (set->use ||
4888             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4889              atomic_read(&set->nelems) > 0)) {
4890                 NL_SET_BAD_ATTR(extack, attr);
4891                 return -EBUSY;
4892         }
4893
4894         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4895
4896         return nft_delset(&ctx, set);
4897 }
4898
4899 static int nft_validate_register_store(const struct nft_ctx *ctx,
4900                                        enum nft_registers reg,
4901                                        const struct nft_data *data,
4902                                        enum nft_data_types type,
4903                                        unsigned int len);
4904
4905 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4906                                      struct nft_set *set,
4907                                      struct nft_set_elem *elem)
4908 {
4909         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4910         enum nft_registers dreg;
4911
4912         dreg = nft_type_to_reg(set->dtype);
4913         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4914                                            set->dtype == NFT_DATA_VERDICT ?
4915                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4916                                            set->dlen);
4917 }
4918
4919 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4920                                         struct nft_set *set,
4921                                         const struct nft_set_iter *iter,
4922                                         struct nft_set_elem *elem)
4923 {
4924         return nft_setelem_data_validate(ctx, set, elem);
4925 }
4926
4927 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4928                                        struct nft_set *set)
4929 {
4930         u8 genmask = nft_genmask_next(ctx->net);
4931         struct nft_set_elem_catchall *catchall;
4932         struct nft_set_elem elem;
4933         struct nft_set_ext *ext;
4934         int ret = 0;
4935
4936         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4937                 ext = nft_set_elem_ext(set, catchall->elem);
4938                 if (!nft_set_elem_active(ext, genmask))
4939                         continue;
4940
4941                 elem.priv = catchall->elem;
4942                 ret = nft_setelem_data_validate(ctx, set, &elem);
4943                 if (ret < 0)
4944                         break;
4945         }
4946
4947         return ret;
4948 }
4949
4950 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4951                        struct nft_set_binding *binding)
4952 {
4953         struct nft_set_binding *i;
4954         struct nft_set_iter iter;
4955
4956         if (set->use == UINT_MAX)
4957                 return -EOVERFLOW;
4958
4959         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4960                 return -EBUSY;
4961
4962         if (binding->flags & NFT_SET_MAP) {
4963                 /* If the set is already bound to the same chain all
4964                  * jumps are already validated for that chain.
4965                  */
4966                 list_for_each_entry(i, &set->bindings, list) {
4967                         if (i->flags & NFT_SET_MAP &&
4968                             i->chain == binding->chain)
4969                                 goto bind;
4970                 }
4971
4972                 iter.genmask    = nft_genmask_next(ctx->net);
4973                 iter.skip       = 0;
4974                 iter.count      = 0;
4975                 iter.err        = 0;
4976                 iter.fn         = nf_tables_bind_check_setelem;
4977
4978                 set->ops->walk(ctx, set, &iter);
4979                 if (!iter.err)
4980                         iter.err = nft_set_catchall_bind_check(ctx, set);
4981
4982                 if (iter.err < 0)
4983                         return iter.err;
4984         }
4985 bind:
4986         binding->chain = ctx->chain;
4987         list_add_tail_rcu(&binding->list, &set->bindings);
4988         nft_set_trans_bind(ctx, set);
4989         set->use++;
4990
4991         return 0;
4992 }
4993 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4994
4995 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4996                                  struct nft_set_binding *binding, bool event)
4997 {
4998         list_del_rcu(&binding->list);
4999
5000         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5001                 list_del_rcu(&set->list);
5002                 if (event)
5003                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5004                                              GFP_KERNEL);
5005         }
5006 }
5007
5008 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5009                               struct nft_set_binding *binding,
5010                               enum nft_trans_phase phase)
5011 {
5012         switch (phase) {
5013         case NFT_TRANS_PREPARE:
5014                 set->use--;
5015                 return;
5016         case NFT_TRANS_ABORT:
5017         case NFT_TRANS_RELEASE:
5018                 set->use--;
5019                 fallthrough;
5020         default:
5021                 nf_tables_unbind_set(ctx, set, binding,
5022                                      phase == NFT_TRANS_COMMIT);
5023         }
5024 }
5025 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5026
5027 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5028 {
5029         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5030                 nft_set_destroy(ctx, set);
5031 }
5032 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5033
5034 const struct nft_set_ext_type nft_set_ext_types[] = {
5035         [NFT_SET_EXT_KEY]               = {
5036                 .align  = __alignof__(u32),
5037         },
5038         [NFT_SET_EXT_DATA]              = {
5039                 .align  = __alignof__(u32),
5040         },
5041         [NFT_SET_EXT_EXPRESSIONS]       = {
5042                 .align  = __alignof__(struct nft_set_elem_expr),
5043         },
5044         [NFT_SET_EXT_OBJREF]            = {
5045                 .len    = sizeof(struct nft_object *),
5046                 .align  = __alignof__(struct nft_object *),
5047         },
5048         [NFT_SET_EXT_FLAGS]             = {
5049                 .len    = sizeof(u8),
5050                 .align  = __alignof__(u8),
5051         },
5052         [NFT_SET_EXT_TIMEOUT]           = {
5053                 .len    = sizeof(u64),
5054                 .align  = __alignof__(u64),
5055         },
5056         [NFT_SET_EXT_EXPIRATION]        = {
5057                 .len    = sizeof(u64),
5058                 .align  = __alignof__(u64),
5059         },
5060         [NFT_SET_EXT_USERDATA]          = {
5061                 .len    = sizeof(struct nft_userdata),
5062                 .align  = __alignof__(struct nft_userdata),
5063         },
5064         [NFT_SET_EXT_KEY_END]           = {
5065                 .align  = __alignof__(u32),
5066         },
5067 };
5068
5069 /*
5070  * Set elements
5071  */
5072
5073 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5074         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5075         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5076         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5077         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5078         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5079         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5080                                             .len = NFT_USERDATA_MAXLEN },
5081         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5082         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5083                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5084         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5085         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5086 };
5087
5088 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5089         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5090                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5091         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5092                                             .len = NFT_SET_MAXNAMELEN - 1 },
5093         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5094         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5095 };
5096
5097 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5098                                   const struct nft_set *set,
5099                                   const struct nft_set_ext *ext)
5100 {
5101         struct nft_set_elem_expr *elem_expr;
5102         u32 size, num_exprs = 0;
5103         struct nft_expr *expr;
5104         struct nlattr *nest;
5105
5106         elem_expr = nft_set_ext_expr(ext);
5107         nft_setelem_expr_foreach(expr, elem_expr, size)
5108                 num_exprs++;
5109
5110         if (num_exprs == 1) {
5111                 expr = nft_setelem_expr_at(elem_expr, 0);
5112                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, false) < 0)
5113                         return -1;
5114
5115                 return 0;
5116         } else if (num_exprs > 1) {
5117                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5118                 if (nest == NULL)
5119                         goto nla_put_failure;
5120
5121                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5122                         expr = nft_setelem_expr_at(elem_expr, size);
5123                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, false) < 0)
5124                                 goto nla_put_failure;
5125                 }
5126                 nla_nest_end(skb, nest);
5127         }
5128         return 0;
5129
5130 nla_put_failure:
5131         return -1;
5132 }
5133
5134 static int nf_tables_fill_setelem(struct sk_buff *skb,
5135                                   const struct nft_set *set,
5136                                   const struct nft_set_elem *elem)
5137 {
5138         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5139         unsigned char *b = skb_tail_pointer(skb);
5140         struct nlattr *nest;
5141
5142         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5143         if (nest == NULL)
5144                 goto nla_put_failure;
5145
5146         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5147             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5148                           NFT_DATA_VALUE, set->klen) < 0)
5149                 goto nla_put_failure;
5150
5151         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5152             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5153                           NFT_DATA_VALUE, set->klen) < 0)
5154                 goto nla_put_failure;
5155
5156         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5157             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5158                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5159                           set->dlen) < 0)
5160                 goto nla_put_failure;
5161
5162         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5163             nft_set_elem_expr_dump(skb, set, ext))
5164                 goto nla_put_failure;
5165
5166         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5167             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5168                            (*nft_set_ext_obj(ext))->key.name) < 0)
5169                 goto nla_put_failure;
5170
5171         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5172             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5173                          htonl(*nft_set_ext_flags(ext))))
5174                 goto nla_put_failure;
5175
5176         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5177             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5178                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5179                          NFTA_SET_ELEM_PAD))
5180                 goto nla_put_failure;
5181
5182         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5183                 u64 expires, now = get_jiffies_64();
5184
5185                 expires = *nft_set_ext_expiration(ext);
5186                 if (time_before64(now, expires))
5187                         expires -= now;
5188                 else
5189                         expires = 0;
5190
5191                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5192                                  nf_jiffies64_to_msecs(expires),
5193                                  NFTA_SET_ELEM_PAD))
5194                         goto nla_put_failure;
5195         }
5196
5197         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5198                 struct nft_userdata *udata;
5199
5200                 udata = nft_set_ext_userdata(ext);
5201                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5202                             udata->len + 1, udata->data))
5203                         goto nla_put_failure;
5204         }
5205
5206         nla_nest_end(skb, nest);
5207         return 0;
5208
5209 nla_put_failure:
5210         nlmsg_trim(skb, b);
5211         return -EMSGSIZE;
5212 }
5213
5214 struct nft_set_dump_args {
5215         const struct netlink_callback   *cb;
5216         struct nft_set_iter             iter;
5217         struct sk_buff                  *skb;
5218 };
5219
5220 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5221                                   struct nft_set *set,
5222                                   const struct nft_set_iter *iter,
5223                                   struct nft_set_elem *elem)
5224 {
5225         struct nft_set_dump_args *args;
5226
5227         args = container_of(iter, struct nft_set_dump_args, iter);
5228         return nf_tables_fill_setelem(args->skb, set, elem);
5229 }
5230
5231 struct nft_set_dump_ctx {
5232         const struct nft_set    *set;
5233         struct nft_ctx          ctx;
5234 };
5235
5236 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5237                                  const struct nft_set *set)
5238 {
5239         struct nft_set_elem_catchall *catchall;
5240         u8 genmask = nft_genmask_cur(net);
5241         struct nft_set_elem elem;
5242         struct nft_set_ext *ext;
5243         int ret = 0;
5244
5245         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5246                 ext = nft_set_elem_ext(set, catchall->elem);
5247                 if (!nft_set_elem_active(ext, genmask) ||
5248                     nft_set_elem_expired(ext))
5249                         continue;
5250
5251                 elem.priv = catchall->elem;
5252                 ret = nf_tables_fill_setelem(skb, set, &elem);
5253                 break;
5254         }
5255
5256         return ret;
5257 }
5258
5259 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5260 {
5261         struct nft_set_dump_ctx *dump_ctx = cb->data;
5262         struct net *net = sock_net(skb->sk);
5263         struct nftables_pernet *nft_net;
5264         struct nft_table *table;
5265         struct nft_set *set;
5266         struct nft_set_dump_args args;
5267         bool set_found = false;
5268         struct nlmsghdr *nlh;
5269         struct nlattr *nest;
5270         u32 portid, seq;
5271         int event;
5272
5273         rcu_read_lock();
5274         nft_net = nft_pernet(net);
5275         cb->seq = READ_ONCE(nft_net->base_seq);
5276
5277         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5278                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5279                     dump_ctx->ctx.family != table->family)
5280                         continue;
5281
5282                 if (table != dump_ctx->ctx.table)
5283                         continue;
5284
5285                 list_for_each_entry_rcu(set, &table->sets, list) {
5286                         if (set == dump_ctx->set) {
5287                                 set_found = true;
5288                                 break;
5289                         }
5290                 }
5291                 break;
5292         }
5293
5294         if (!set_found) {
5295                 rcu_read_unlock();
5296                 return -ENOENT;
5297         }
5298
5299         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5300         portid = NETLINK_CB(cb->skb).portid;
5301         seq    = cb->nlh->nlmsg_seq;
5302
5303         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5304                            table->family, NFNETLINK_V0, nft_base_seq(net));
5305         if (!nlh)
5306                 goto nla_put_failure;
5307
5308         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5309                 goto nla_put_failure;
5310         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5311                 goto nla_put_failure;
5312
5313         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5314         if (nest == NULL)
5315                 goto nla_put_failure;
5316
5317         args.cb                 = cb;
5318         args.skb                = skb;
5319         args.iter.genmask       = nft_genmask_cur(net);
5320         args.iter.skip          = cb->args[0];
5321         args.iter.count         = 0;
5322         args.iter.err           = 0;
5323         args.iter.fn            = nf_tables_dump_setelem;
5324         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5325
5326         if (!args.iter.err && args.iter.count == cb->args[0])
5327                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5328         rcu_read_unlock();
5329
5330         nla_nest_end(skb, nest);
5331         nlmsg_end(skb, nlh);
5332
5333         if (args.iter.err && args.iter.err != -EMSGSIZE)
5334                 return args.iter.err;
5335         if (args.iter.count == cb->args[0])
5336                 return 0;
5337
5338         cb->args[0] = args.iter.count;
5339         return skb->len;
5340
5341 nla_put_failure:
5342         rcu_read_unlock();
5343         return -ENOSPC;
5344 }
5345
5346 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5347 {
5348         struct nft_set_dump_ctx *dump_ctx = cb->data;
5349
5350         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5351
5352         return cb->data ? 0 : -ENOMEM;
5353 }
5354
5355 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5356 {
5357         kfree(cb->data);
5358         return 0;
5359 }
5360
5361 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5362                                        const struct nft_ctx *ctx, u32 seq,
5363                                        u32 portid, int event, u16 flags,
5364                                        const struct nft_set *set,
5365                                        const struct nft_set_elem *elem)
5366 {
5367         struct nlmsghdr *nlh;
5368         struct nlattr *nest;
5369         int err;
5370
5371         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5372         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5373                            NFNETLINK_V0, nft_base_seq(ctx->net));
5374         if (!nlh)
5375                 goto nla_put_failure;
5376
5377         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5378                 goto nla_put_failure;
5379         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5380                 goto nla_put_failure;
5381
5382         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5383         if (nest == NULL)
5384                 goto nla_put_failure;
5385
5386         err = nf_tables_fill_setelem(skb, set, elem);
5387         if (err < 0)
5388                 goto nla_put_failure;
5389
5390         nla_nest_end(skb, nest);
5391
5392         nlmsg_end(skb, nlh);
5393         return 0;
5394
5395 nla_put_failure:
5396         nlmsg_trim(skb, nlh);
5397         return -1;
5398 }
5399
5400 static int nft_setelem_parse_flags(const struct nft_set *set,
5401                                    const struct nlattr *attr, u32 *flags)
5402 {
5403         if (attr == NULL)
5404                 return 0;
5405
5406         *flags = ntohl(nla_get_be32(attr));
5407         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5408                 return -EOPNOTSUPP;
5409         if (!(set->flags & NFT_SET_INTERVAL) &&
5410             *flags & NFT_SET_ELEM_INTERVAL_END)
5411                 return -EINVAL;
5412         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5413             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5414                 return -EINVAL;
5415
5416         return 0;
5417 }
5418
5419 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5420                                  struct nft_data *key, struct nlattr *attr)
5421 {
5422         struct nft_data_desc desc = {
5423                 .type   = NFT_DATA_VALUE,
5424                 .size   = NFT_DATA_VALUE_MAXLEN,
5425                 .len    = set->klen,
5426         };
5427
5428         return nft_data_init(ctx, key, &desc, attr);
5429 }
5430
5431 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5432                                   struct nft_data_desc *desc,
5433                                   struct nft_data *data,
5434                                   struct nlattr *attr)
5435 {
5436         u32 dtype;
5437
5438         if (set->dtype == NFT_DATA_VERDICT)
5439                 dtype = NFT_DATA_VERDICT;
5440         else
5441                 dtype = NFT_DATA_VALUE;
5442
5443         desc->type = dtype;
5444         desc->size = NFT_DATA_VALUE_MAXLEN;
5445         desc->len = set->dlen;
5446         desc->flags = NFT_DATA_DESC_SETELEM;
5447
5448         return nft_data_init(ctx, data, desc, attr);
5449 }
5450
5451 static void *nft_setelem_catchall_get(const struct net *net,
5452                                       const struct nft_set *set)
5453 {
5454         struct nft_set_elem_catchall *catchall;
5455         u8 genmask = nft_genmask_cur(net);
5456         struct nft_set_ext *ext;
5457         void *priv = NULL;
5458
5459         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5460                 ext = nft_set_elem_ext(set, catchall->elem);
5461                 if (!nft_set_elem_active(ext, genmask) ||
5462                     nft_set_elem_expired(ext))
5463                         continue;
5464
5465                 priv = catchall->elem;
5466                 break;
5467         }
5468
5469         return priv;
5470 }
5471
5472 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5473                            struct nft_set_elem *elem, u32 flags)
5474 {
5475         void *priv;
5476
5477         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5478                 priv = set->ops->get(ctx->net, set, elem, flags);
5479                 if (IS_ERR(priv))
5480                         return PTR_ERR(priv);
5481         } else {
5482                 priv = nft_setelem_catchall_get(ctx->net, set);
5483                 if (!priv)
5484                         return -ENOENT;
5485         }
5486         elem->priv = priv;
5487
5488         return 0;
5489 }
5490
5491 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5492                             const struct nlattr *attr)
5493 {
5494         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5495         struct nft_set_elem elem;
5496         struct sk_buff *skb;
5497         uint32_t flags = 0;
5498         int err;
5499
5500         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5501                                           nft_set_elem_policy, NULL);
5502         if (err < 0)
5503                 return err;
5504
5505         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5506         if (err < 0)
5507                 return err;
5508
5509         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5510                 return -EINVAL;
5511
5512         if (nla[NFTA_SET_ELEM_KEY]) {
5513                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5514                                             nla[NFTA_SET_ELEM_KEY]);
5515                 if (err < 0)
5516                         return err;
5517         }
5518
5519         if (nla[NFTA_SET_ELEM_KEY_END]) {
5520                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5521                                             nla[NFTA_SET_ELEM_KEY_END]);
5522                 if (err < 0)
5523                         return err;
5524         }
5525
5526         err = nft_setelem_get(ctx, set, &elem, flags);
5527         if (err < 0)
5528                 return err;
5529
5530         err = -ENOMEM;
5531         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5532         if (skb == NULL)
5533                 return err;
5534
5535         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5536                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5537         if (err < 0)
5538                 goto err_fill_setelem;
5539
5540         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5541
5542 err_fill_setelem:
5543         kfree_skb(skb);
5544         return err;
5545 }
5546
5547 /* called with rcu_read_lock held */
5548 static int nf_tables_getsetelem(struct sk_buff *skb,
5549                                 const struct nfnl_info *info,
5550                                 const struct nlattr * const nla[])
5551 {
5552         struct netlink_ext_ack *extack = info->extack;
5553         u8 genmask = nft_genmask_cur(info->net);
5554         u8 family = info->nfmsg->nfgen_family;
5555         struct net *net = info->net;
5556         struct nft_table *table;
5557         struct nft_set *set;
5558         struct nlattr *attr;
5559         struct nft_ctx ctx;
5560         int rem, err = 0;
5561
5562         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5563                                  genmask, 0);
5564         if (IS_ERR(table)) {
5565                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5566                 return PTR_ERR(table);
5567         }
5568
5569         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5570         if (IS_ERR(set))
5571                 return PTR_ERR(set);
5572
5573         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5574
5575         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5576                 struct netlink_dump_control c = {
5577                         .start = nf_tables_dump_set_start,
5578                         .dump = nf_tables_dump_set,
5579                         .done = nf_tables_dump_set_done,
5580                         .module = THIS_MODULE,
5581                 };
5582                 struct nft_set_dump_ctx dump_ctx = {
5583                         .set = set,
5584                         .ctx = ctx,
5585                 };
5586
5587                 c.data = &dump_ctx;
5588                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5589         }
5590
5591         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5592                 return -EINVAL;
5593
5594         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5595                 err = nft_get_set_elem(&ctx, set, attr);
5596                 if (err < 0) {
5597                         NL_SET_BAD_ATTR(extack, attr);
5598                         break;
5599                 }
5600         }
5601
5602         return err;
5603 }
5604
5605 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5606                                      const struct nft_set *set,
5607                                      const struct nft_set_elem *elem,
5608                                      int event)
5609 {
5610         struct nftables_pernet *nft_net;
5611         struct net *net = ctx->net;
5612         u32 portid = ctx->portid;
5613         struct sk_buff *skb;
5614         u16 flags = 0;
5615         int err;
5616
5617         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5618                 return;
5619
5620         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5621         if (skb == NULL)
5622                 goto err;
5623
5624         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5625                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5626
5627         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5628                                           set, elem);
5629         if (err < 0) {
5630                 kfree_skb(skb);
5631                 goto err;
5632         }
5633
5634         nft_net = nft_pernet(net);
5635         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5636         return;
5637 err:
5638         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5639 }
5640
5641 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5642                                               int msg_type,
5643                                               struct nft_set *set)
5644 {
5645         struct nft_trans *trans;
5646
5647         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5648         if (trans == NULL)
5649                 return NULL;
5650
5651         nft_trans_elem_set(trans) = set;
5652         return trans;
5653 }
5654
5655 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5656                                          const struct nft_set *set,
5657                                          const struct nlattr *attr)
5658 {
5659         struct nft_expr *expr;
5660         int err;
5661
5662         expr = nft_expr_init(ctx, attr);
5663         if (IS_ERR(expr))
5664                 return expr;
5665
5666         err = -EOPNOTSUPP;
5667         if (expr->ops->type->flags & NFT_EXPR_GC) {
5668                 if (set->flags & NFT_SET_TIMEOUT)
5669                         goto err_set_elem_expr;
5670                 if (!set->ops->gc_init)
5671                         goto err_set_elem_expr;
5672                 set->ops->gc_init(set);
5673         }
5674
5675         return expr;
5676
5677 err_set_elem_expr:
5678         nft_expr_destroy(ctx, expr);
5679         return ERR_PTR(err);
5680 }
5681
5682 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5683 {
5684         len += nft_set_ext_types[id].len;
5685         if (len > tmpl->ext_len[id] ||
5686             len > U8_MAX)
5687                 return -1;
5688
5689         return 0;
5690 }
5691
5692 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5693                               void *to, const void *from, u32 len)
5694 {
5695         if (nft_set_ext_check(tmpl, id, len) < 0)
5696                 return -1;
5697
5698         memcpy(to, from, len);
5699
5700         return 0;
5701 }
5702
5703 void *nft_set_elem_init(const struct nft_set *set,
5704                         const struct nft_set_ext_tmpl *tmpl,
5705                         const u32 *key, const u32 *key_end,
5706                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5707 {
5708         struct nft_set_ext *ext;
5709         void *elem;
5710
5711         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5712         if (elem == NULL)
5713                 return ERR_PTR(-ENOMEM);
5714
5715         ext = nft_set_elem_ext(set, elem);
5716         nft_set_ext_init(ext, tmpl);
5717
5718         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5719             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5720                                nft_set_ext_key(ext), key, set->klen) < 0)
5721                 goto err_ext_check;
5722
5723         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5724             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5725                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5726                 goto err_ext_check;
5727
5728         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5729             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5730                                nft_set_ext_data(ext), data, set->dlen) < 0)
5731                 goto err_ext_check;
5732
5733         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5734                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5735                 if (expiration == 0)
5736                         *nft_set_ext_expiration(ext) += timeout;
5737         }
5738         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5739                 *nft_set_ext_timeout(ext) = timeout;
5740
5741         return elem;
5742
5743 err_ext_check:
5744         kfree(elem);
5745
5746         return ERR_PTR(-EINVAL);
5747 }
5748
5749 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5750                                         struct nft_expr *expr)
5751 {
5752         if (expr->ops->destroy_clone) {
5753                 expr->ops->destroy_clone(ctx, expr);
5754                 module_put(expr->ops->type->owner);
5755         } else {
5756                 nf_tables_expr_destroy(ctx, expr);
5757         }
5758 }
5759
5760 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5761                                       struct nft_set_elem_expr *elem_expr)
5762 {
5763         struct nft_expr *expr;
5764         u32 size;
5765
5766         nft_setelem_expr_foreach(expr, elem_expr, size)
5767                 __nft_set_elem_expr_destroy(ctx, expr);
5768 }
5769
5770 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5771                           bool destroy_expr)
5772 {
5773         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5774         struct nft_ctx ctx = {
5775                 .net    = read_pnet(&set->net),
5776                 .family = set->table->family,
5777         };
5778
5779         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5780         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5781                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5782         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5783                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5784
5785         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5786                 (*nft_set_ext_obj(ext))->use--;
5787         kfree(elem);
5788 }
5789 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5790
5791 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5792  * with the refcounting from the preparation phase.
5793  */
5794 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5795                                        const struct nft_set *set, void *elem)
5796 {
5797         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5798
5799         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5800                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5801
5802         kfree(elem);
5803 }
5804
5805 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5806                             struct nft_expr *expr_array[])
5807 {
5808         struct nft_expr *expr;
5809         int err, i, k;
5810
5811         for (i = 0; i < set->num_exprs; i++) {
5812                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5813                 if (!expr)
5814                         goto err_expr;
5815
5816                 err = nft_expr_clone(expr, set->exprs[i]);
5817                 if (err < 0) {
5818                         kfree(expr);
5819                         goto err_expr;
5820                 }
5821                 expr_array[i] = expr;
5822         }
5823
5824         return 0;
5825
5826 err_expr:
5827         for (k = i - 1; k >= 0; k--)
5828                 nft_expr_destroy(ctx, expr_array[k]);
5829
5830         return -ENOMEM;
5831 }
5832
5833 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5834                                    const struct nft_set_ext_tmpl *tmpl,
5835                                    const struct nft_set_ext *ext,
5836                                    struct nft_expr *expr_array[],
5837                                    u32 num_exprs)
5838 {
5839         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5840         u32 len = sizeof(struct nft_set_elem_expr);
5841         struct nft_expr *expr;
5842         int i, err;
5843
5844         if (num_exprs == 0)
5845                 return 0;
5846
5847         for (i = 0; i < num_exprs; i++)
5848                 len += expr_array[i]->ops->size;
5849
5850         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5851                 return -EINVAL;
5852
5853         for (i = 0; i < num_exprs; i++) {
5854                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5855                 err = nft_expr_clone(expr, expr_array[i]);
5856                 if (err < 0)
5857                         goto err_elem_expr_setup;
5858
5859                 elem_expr->size += expr_array[i]->ops->size;
5860                 nft_expr_destroy(ctx, expr_array[i]);
5861                 expr_array[i] = NULL;
5862         }
5863
5864         return 0;
5865
5866 err_elem_expr_setup:
5867         for (; i < num_exprs; i++) {
5868                 nft_expr_destroy(ctx, expr_array[i]);
5869                 expr_array[i] = NULL;
5870         }
5871
5872         return -ENOMEM;
5873 }
5874
5875 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5876                                             const struct nft_set *set)
5877 {
5878         struct nft_set_elem_catchall *catchall;
5879         u8 genmask = nft_genmask_cur(net);
5880         struct nft_set_ext *ext;
5881
5882         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5883                 ext = nft_set_elem_ext(set, catchall->elem);
5884                 if (nft_set_elem_active(ext, genmask) &&
5885                     !nft_set_elem_expired(ext))
5886                         return ext;
5887         }
5888
5889         return NULL;
5890 }
5891 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5892
5893 void *nft_set_catchall_gc(const struct nft_set *set)
5894 {
5895         struct nft_set_elem_catchall *catchall, *next;
5896         struct nft_set_ext *ext;
5897         void *elem = NULL;
5898
5899         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5900                 ext = nft_set_elem_ext(set, catchall->elem);
5901
5902                 if (!nft_set_elem_expired(ext) ||
5903                     nft_set_elem_mark_busy(ext))
5904                         continue;
5905
5906                 elem = catchall->elem;
5907                 list_del_rcu(&catchall->list);
5908                 kfree_rcu(catchall, rcu);
5909                 break;
5910         }
5911
5912         return elem;
5913 }
5914 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5915
5916 static int nft_setelem_catchall_insert(const struct net *net,
5917                                        struct nft_set *set,
5918                                        const struct nft_set_elem *elem,
5919                                        struct nft_set_ext **pext)
5920 {
5921         struct nft_set_elem_catchall *catchall;
5922         u8 genmask = nft_genmask_next(net);
5923         struct nft_set_ext *ext;
5924
5925         list_for_each_entry(catchall, &set->catchall_list, list) {
5926                 ext = nft_set_elem_ext(set, catchall->elem);
5927                 if (nft_set_elem_active(ext, genmask)) {
5928                         *pext = ext;
5929                         return -EEXIST;
5930                 }
5931         }
5932
5933         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5934         if (!catchall)
5935                 return -ENOMEM;
5936
5937         catchall->elem = elem->priv;
5938         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5939
5940         return 0;
5941 }
5942
5943 static int nft_setelem_insert(const struct net *net,
5944                               struct nft_set *set,
5945                               const struct nft_set_elem *elem,
5946                               struct nft_set_ext **ext, unsigned int flags)
5947 {
5948         int ret;
5949
5950         if (flags & NFT_SET_ELEM_CATCHALL)
5951                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5952         else
5953                 ret = set->ops->insert(net, set, elem, ext);
5954
5955         return ret;
5956 }
5957
5958 static bool nft_setelem_is_catchall(const struct nft_set *set,
5959                                     const struct nft_set_elem *elem)
5960 {
5961         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5962
5963         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5964             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5965                 return true;
5966
5967         return false;
5968 }
5969
5970 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5971                                  struct nft_set_elem *elem)
5972 {
5973         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5974
5975         if (nft_setelem_is_catchall(set, elem)) {
5976                 nft_set_elem_change_active(net, set, ext);
5977                 nft_set_elem_clear_busy(ext);
5978         } else {
5979                 set->ops->activate(net, set, elem);
5980         }
5981 }
5982
5983 static int nft_setelem_catchall_deactivate(const struct net *net,
5984                                            struct nft_set *set,
5985                                            struct nft_set_elem *elem)
5986 {
5987         struct nft_set_elem_catchall *catchall;
5988         struct nft_set_ext *ext;
5989
5990         list_for_each_entry(catchall, &set->catchall_list, list) {
5991                 ext = nft_set_elem_ext(set, catchall->elem);
5992                 if (!nft_is_active(net, ext) ||
5993                     nft_set_elem_mark_busy(ext))
5994                         continue;
5995
5996                 kfree(elem->priv);
5997                 elem->priv = catchall->elem;
5998                 nft_set_elem_change_active(net, set, ext);
5999                 return 0;
6000         }
6001
6002         return -ENOENT;
6003 }
6004
6005 static int __nft_setelem_deactivate(const struct net *net,
6006                                     struct nft_set *set,
6007                                     struct nft_set_elem *elem)
6008 {
6009         void *priv;
6010
6011         priv = set->ops->deactivate(net, set, elem);
6012         if (!priv)
6013                 return -ENOENT;
6014
6015         kfree(elem->priv);
6016         elem->priv = priv;
6017         set->ndeact++;
6018
6019         return 0;
6020 }
6021
6022 static int nft_setelem_deactivate(const struct net *net,
6023                                   struct nft_set *set,
6024                                   struct nft_set_elem *elem, u32 flags)
6025 {
6026         int ret;
6027
6028         if (flags & NFT_SET_ELEM_CATCHALL)
6029                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6030         else
6031                 ret = __nft_setelem_deactivate(net, set, elem);
6032
6033         return ret;
6034 }
6035
6036 static void nft_setelem_catchall_remove(const struct net *net,
6037                                         const struct nft_set *set,
6038                                         const struct nft_set_elem *elem)
6039 {
6040         struct nft_set_elem_catchall *catchall, *next;
6041
6042         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6043                 if (catchall->elem == elem->priv) {
6044                         list_del_rcu(&catchall->list);
6045                         kfree_rcu(catchall, rcu);
6046                         break;
6047                 }
6048         }
6049 }
6050
6051 static void nft_setelem_remove(const struct net *net,
6052                                const struct nft_set *set,
6053                                const struct nft_set_elem *elem)
6054 {
6055         if (nft_setelem_is_catchall(set, elem))
6056                 nft_setelem_catchall_remove(net, set, elem);
6057         else
6058                 set->ops->remove(net, set, elem);
6059 }
6060
6061 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6062                                       struct nlattr **nla, u32 flags)
6063 {
6064         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6065                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6066                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6067                         return false;
6068
6069                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6070                     flags & NFT_SET_ELEM_CATCHALL)
6071                         return false;
6072         } else {
6073                 if (nla[NFTA_SET_ELEM_KEY_END])
6074                         return false;
6075         }
6076
6077         return true;
6078 }
6079
6080 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6081                             const struct nlattr *attr, u32 nlmsg_flags)
6082 {
6083         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6084         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6085         u8 genmask = nft_genmask_next(ctx->net);
6086         u32 flags = 0, size = 0, num_exprs = 0;
6087         struct nft_set_ext_tmpl tmpl;
6088         struct nft_set_ext *ext, *ext2;
6089         struct nft_set_elem elem;
6090         struct nft_set_binding *binding;
6091         struct nft_object *obj = NULL;
6092         struct nft_userdata *udata;
6093         struct nft_data_desc desc;
6094         enum nft_registers dreg;
6095         struct nft_trans *trans;
6096         u64 timeout;
6097         u64 expiration;
6098         int err, i;
6099         u8 ulen;
6100
6101         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6102                                           nft_set_elem_policy, NULL);
6103         if (err < 0)
6104                 return err;
6105
6106         nft_set_ext_prepare(&tmpl);
6107
6108         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6109         if (err < 0)
6110                 return err;
6111
6112         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6113             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6114                 return -EINVAL;
6115
6116         if (flags != 0) {
6117                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6118                 if (err < 0)
6119                         return err;
6120         }
6121
6122         if (set->flags & NFT_SET_MAP) {
6123                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6124                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6125                         return -EINVAL;
6126         } else {
6127                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6128                         return -EINVAL;
6129         }
6130
6131         if (set->flags & NFT_SET_OBJECT) {
6132                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6133                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6134                         return -EINVAL;
6135         } else {
6136                 if (nla[NFTA_SET_ELEM_OBJREF])
6137                         return -EINVAL;
6138         }
6139
6140         if (!nft_setelem_valid_key_end(set, nla, flags))
6141                 return -EINVAL;
6142
6143         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6144              (nla[NFTA_SET_ELEM_DATA] ||
6145               nla[NFTA_SET_ELEM_OBJREF] ||
6146               nla[NFTA_SET_ELEM_TIMEOUT] ||
6147               nla[NFTA_SET_ELEM_EXPIRATION] ||
6148               nla[NFTA_SET_ELEM_USERDATA] ||
6149               nla[NFTA_SET_ELEM_EXPR] ||
6150               nla[NFTA_SET_ELEM_KEY_END] ||
6151               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6152                 return -EINVAL;
6153
6154         timeout = 0;
6155         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6156                 if (!(set->flags & NFT_SET_TIMEOUT))
6157                         return -EINVAL;
6158                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6159                                             &timeout);
6160                 if (err)
6161                         return err;
6162         } else if (set->flags & NFT_SET_TIMEOUT &&
6163                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6164                 timeout = READ_ONCE(set->timeout);
6165         }
6166
6167         expiration = 0;
6168         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6169                 if (!(set->flags & NFT_SET_TIMEOUT))
6170                         return -EINVAL;
6171                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6172                                             &expiration);
6173                 if (err)
6174                         return err;
6175         }
6176
6177         if (nla[NFTA_SET_ELEM_EXPR]) {
6178                 struct nft_expr *expr;
6179
6180                 if (set->num_exprs && set->num_exprs != 1)
6181                         return -EOPNOTSUPP;
6182
6183                 expr = nft_set_elem_expr_alloc(ctx, set,
6184                                                nla[NFTA_SET_ELEM_EXPR]);
6185                 if (IS_ERR(expr))
6186                         return PTR_ERR(expr);
6187
6188                 expr_array[0] = expr;
6189                 num_exprs = 1;
6190
6191                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6192                         err = -EOPNOTSUPP;
6193                         goto err_set_elem_expr;
6194                 }
6195         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6196                 struct nft_expr *expr;
6197                 struct nlattr *tmp;
6198                 int left;
6199
6200                 i = 0;
6201                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6202                         if (i == NFT_SET_EXPR_MAX ||
6203                             (set->num_exprs && set->num_exprs == i)) {
6204                                 err = -E2BIG;
6205                                 goto err_set_elem_expr;
6206                         }
6207                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6208                                 err = -EINVAL;
6209                                 goto err_set_elem_expr;
6210                         }
6211                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6212                         if (IS_ERR(expr)) {
6213                                 err = PTR_ERR(expr);
6214                                 goto err_set_elem_expr;
6215                         }
6216                         expr_array[i] = expr;
6217                         num_exprs++;
6218
6219                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6220                                 err = -EOPNOTSUPP;
6221                                 goto err_set_elem_expr;
6222                         }
6223                         i++;
6224                 }
6225                 if (set->num_exprs && set->num_exprs != i) {
6226                         err = -EOPNOTSUPP;
6227                         goto err_set_elem_expr;
6228                 }
6229         } else if (set->num_exprs > 0 &&
6230                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6231                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6232                 if (err < 0)
6233                         goto err_set_elem_expr_clone;
6234
6235                 num_exprs = set->num_exprs;
6236         }
6237
6238         if (nla[NFTA_SET_ELEM_KEY]) {
6239                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6240                                             nla[NFTA_SET_ELEM_KEY]);
6241                 if (err < 0)
6242                         goto err_set_elem_expr;
6243
6244                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6245                 if (err < 0)
6246                         goto err_parse_key;
6247         }
6248
6249         if (nla[NFTA_SET_ELEM_KEY_END]) {
6250                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6251                                             nla[NFTA_SET_ELEM_KEY_END]);
6252                 if (err < 0)
6253                         goto err_parse_key;
6254
6255                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6256                 if (err < 0)
6257                         goto err_parse_key_end;
6258         }
6259
6260         if (timeout > 0) {
6261                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6262                 if (err < 0)
6263                         goto err_parse_key_end;
6264
6265                 if (timeout != READ_ONCE(set->timeout)) {
6266                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6267                         if (err < 0)
6268                                 goto err_parse_key_end;
6269                 }
6270         }
6271
6272         if (num_exprs) {
6273                 for (i = 0; i < num_exprs; i++)
6274                         size += expr_array[i]->ops->size;
6275
6276                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6277                                              sizeof(struct nft_set_elem_expr) + size);
6278                 if (err < 0)
6279                         goto err_parse_key_end;
6280         }
6281
6282         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6283                 obj = nft_obj_lookup(ctx->net, ctx->table,
6284                                      nla[NFTA_SET_ELEM_OBJREF],
6285                                      set->objtype, genmask);
6286                 if (IS_ERR(obj)) {
6287                         err = PTR_ERR(obj);
6288                         goto err_parse_key_end;
6289                 }
6290                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6291                 if (err < 0)
6292                         goto err_parse_key_end;
6293         }
6294
6295         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6296                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6297                                              nla[NFTA_SET_ELEM_DATA]);
6298                 if (err < 0)
6299                         goto err_parse_key_end;
6300
6301                 dreg = nft_type_to_reg(set->dtype);
6302                 list_for_each_entry(binding, &set->bindings, list) {
6303                         struct nft_ctx bind_ctx = {
6304                                 .net    = ctx->net,
6305                                 .family = ctx->family,
6306                                 .table  = ctx->table,
6307                                 .chain  = (struct nft_chain *)binding->chain,
6308                         };
6309
6310                         if (!(binding->flags & NFT_SET_MAP))
6311                                 continue;
6312
6313                         err = nft_validate_register_store(&bind_ctx, dreg,
6314                                                           &elem.data.val,
6315                                                           desc.type, desc.len);
6316                         if (err < 0)
6317                                 goto err_parse_data;
6318
6319                         if (desc.type == NFT_DATA_VERDICT &&
6320                             (elem.data.val.verdict.code == NFT_GOTO ||
6321                              elem.data.val.verdict.code == NFT_JUMP))
6322                                 nft_validate_state_update(ctx->net,
6323                                                           NFT_VALIDATE_NEED);
6324                 }
6325
6326                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6327                 if (err < 0)
6328                         goto err_parse_data;
6329         }
6330
6331         /* The full maximum length of userdata can exceed the maximum
6332          * offset value (U8_MAX) for following extensions, therefor it
6333          * must be the last extension added.
6334          */
6335         ulen = 0;
6336         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6337                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6338                 if (ulen > 0) {
6339                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6340                                                      ulen);
6341                         if (err < 0)
6342                                 goto err_parse_data;
6343                 }
6344         }
6345
6346         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6347                                       elem.key_end.val.data, elem.data.val.data,
6348                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6349         if (IS_ERR(elem.priv)) {
6350                 err = PTR_ERR(elem.priv);
6351                 goto err_parse_data;
6352         }
6353
6354         ext = nft_set_elem_ext(set, elem.priv);
6355         if (flags)
6356                 *nft_set_ext_flags(ext) = flags;
6357
6358         if (ulen > 0) {
6359                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6360                         err = -EINVAL;
6361                         goto err_elem_userdata;
6362                 }
6363                 udata = nft_set_ext_userdata(ext);
6364                 udata->len = ulen - 1;
6365                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6366         }
6367         if (obj) {
6368                 *nft_set_ext_obj(ext) = obj;
6369                 obj->use++;
6370         }
6371         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6372         if (err < 0)
6373                 goto err_elem_free;
6374
6375         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6376         if (trans == NULL) {
6377                 err = -ENOMEM;
6378                 goto err_elem_free;
6379         }
6380
6381         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6382
6383         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6384         if (err) {
6385                 if (err == -EEXIST) {
6386                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6387                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6388                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6389                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6390                                 goto err_element_clash;
6391                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6392                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6393                              memcmp(nft_set_ext_data(ext),
6394                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6395                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6396                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6397                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6398                                 goto err_element_clash;
6399                         else if (!(nlmsg_flags & NLM_F_EXCL))
6400                                 err = 0;
6401                 } else if (err == -ENOTEMPTY) {
6402                         /* ENOTEMPTY reports overlapping between this element
6403                          * and an existing one.
6404                          */
6405                         err = -EEXIST;
6406                 }
6407                 goto err_element_clash;
6408         }
6409
6410         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6411             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6412                 err = -ENFILE;
6413                 goto err_set_full;
6414         }
6415
6416         nft_trans_elem(trans) = elem;
6417         nft_trans_commit_list_add_tail(ctx->net, trans);
6418         return 0;
6419
6420 err_set_full:
6421         nft_setelem_remove(ctx->net, set, &elem);
6422 err_element_clash:
6423         kfree(trans);
6424 err_elem_free:
6425         if (obj)
6426                 obj->use--;
6427 err_elem_userdata:
6428         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6429 err_parse_data:
6430         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6431                 nft_data_release(&elem.data.val, desc.type);
6432 err_parse_key_end:
6433         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6434 err_parse_key:
6435         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6436 err_set_elem_expr:
6437         for (i = 0; i < num_exprs && expr_array[i]; i++)
6438                 nft_expr_destroy(ctx, expr_array[i]);
6439 err_set_elem_expr_clone:
6440         return err;
6441 }
6442
6443 static int nf_tables_newsetelem(struct sk_buff *skb,
6444                                 const struct nfnl_info *info,
6445                                 const struct nlattr * const nla[])
6446 {
6447         struct nftables_pernet *nft_net = nft_pernet(info->net);
6448         struct netlink_ext_ack *extack = info->extack;
6449         u8 genmask = nft_genmask_next(info->net);
6450         u8 family = info->nfmsg->nfgen_family;
6451         struct net *net = info->net;
6452         const struct nlattr *attr;
6453         struct nft_table *table;
6454         struct nft_set *set;
6455         struct nft_ctx ctx;
6456         int rem, err;
6457
6458         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6459                 return -EINVAL;
6460
6461         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6462                                  genmask, NETLINK_CB(skb).portid);
6463         if (IS_ERR(table)) {
6464                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6465                 return PTR_ERR(table);
6466         }
6467
6468         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6469                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6470         if (IS_ERR(set))
6471                 return PTR_ERR(set);
6472
6473         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6474                 return -EBUSY;
6475
6476         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6477
6478         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6479                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6480                 if (err < 0) {
6481                         NL_SET_BAD_ATTR(extack, attr);
6482                         return err;
6483                 }
6484         }
6485
6486         if (nft_net->validate_state == NFT_VALIDATE_DO)
6487                 return nft_table_validate(net, table);
6488
6489         return 0;
6490 }
6491
6492 /**
6493  *      nft_data_hold - hold a nft_data item
6494  *
6495  *      @data: struct nft_data to release
6496  *      @type: type of data
6497  *
6498  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6499  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6500  *      NFT_GOTO verdicts. This function must be called on active data objects
6501  *      from the second phase of the commit protocol.
6502  */
6503 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6504 {
6505         struct nft_chain *chain;
6506         struct nft_rule *rule;
6507
6508         if (type == NFT_DATA_VERDICT) {
6509                 switch (data->verdict.code) {
6510                 case NFT_JUMP:
6511                 case NFT_GOTO:
6512                         chain = data->verdict.chain;
6513                         chain->use++;
6514
6515                         if (!nft_chain_is_bound(chain))
6516                                 break;
6517
6518                         chain->table->use++;
6519                         list_for_each_entry(rule, &chain->rules, list)
6520                                 chain->use++;
6521
6522                         nft_chain_add(chain->table, chain);
6523                         break;
6524                 }
6525         }
6526 }
6527
6528 static void nft_setelem_data_activate(const struct net *net,
6529                                       const struct nft_set *set,
6530                                       struct nft_set_elem *elem)
6531 {
6532         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6533
6534         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6535                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6536         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6537                 (*nft_set_ext_obj(ext))->use++;
6538 }
6539
6540 static void nft_setelem_data_deactivate(const struct net *net,
6541                                         const struct nft_set *set,
6542                                         struct nft_set_elem *elem)
6543 {
6544         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6545
6546         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6547                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6548         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6549                 (*nft_set_ext_obj(ext))->use--;
6550 }
6551
6552 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6553                            const struct nlattr *attr)
6554 {
6555         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6556         struct nft_set_ext_tmpl tmpl;
6557         struct nft_set_elem elem;
6558         struct nft_set_ext *ext;
6559         struct nft_trans *trans;
6560         u32 flags = 0;
6561         int err;
6562
6563         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6564                                           nft_set_elem_policy, NULL);
6565         if (err < 0)
6566                 return err;
6567
6568         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6569         if (err < 0)
6570                 return err;
6571
6572         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6573                 return -EINVAL;
6574
6575         if (!nft_setelem_valid_key_end(set, nla, flags))
6576                 return -EINVAL;
6577
6578         nft_set_ext_prepare(&tmpl);
6579
6580         if (flags != 0) {
6581                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6582                 if (err < 0)
6583                         return err;
6584         }
6585
6586         if (nla[NFTA_SET_ELEM_KEY]) {
6587                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6588                                             nla[NFTA_SET_ELEM_KEY]);
6589                 if (err < 0)
6590                         return err;
6591
6592                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6593                 if (err < 0)
6594                         goto fail_elem;
6595         }
6596
6597         if (nla[NFTA_SET_ELEM_KEY_END]) {
6598                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6599                                             nla[NFTA_SET_ELEM_KEY_END]);
6600                 if (err < 0)
6601                         goto fail_elem;
6602
6603                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6604                 if (err < 0)
6605                         goto fail_elem_key_end;
6606         }
6607
6608         err = -ENOMEM;
6609         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6610                                       elem.key_end.val.data, NULL, 0, 0,
6611                                       GFP_KERNEL_ACCOUNT);
6612         if (IS_ERR(elem.priv)) {
6613                 err = PTR_ERR(elem.priv);
6614                 goto fail_elem_key_end;
6615         }
6616
6617         ext = nft_set_elem_ext(set, elem.priv);
6618         if (flags)
6619                 *nft_set_ext_flags(ext) = flags;
6620
6621         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6622         if (trans == NULL)
6623                 goto fail_trans;
6624
6625         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6626         if (err < 0)
6627                 goto fail_ops;
6628
6629         nft_setelem_data_deactivate(ctx->net, set, &elem);
6630
6631         nft_trans_elem(trans) = elem;
6632         nft_trans_commit_list_add_tail(ctx->net, trans);
6633         return 0;
6634
6635 fail_ops:
6636         kfree(trans);
6637 fail_trans:
6638         kfree(elem.priv);
6639 fail_elem_key_end:
6640         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6641 fail_elem:
6642         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6643         return err;
6644 }
6645
6646 static int nft_setelem_flush(const struct nft_ctx *ctx,
6647                              struct nft_set *set,
6648                              const struct nft_set_iter *iter,
6649                              struct nft_set_elem *elem)
6650 {
6651         struct nft_trans *trans;
6652         int err;
6653
6654         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6655                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6656         if (!trans)
6657                 return -ENOMEM;
6658
6659         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6660                 err = -ENOENT;
6661                 goto err1;
6662         }
6663         set->ndeact++;
6664
6665         nft_setelem_data_deactivate(ctx->net, set, elem);
6666         nft_trans_elem_set(trans) = set;
6667         nft_trans_elem(trans) = *elem;
6668         nft_trans_commit_list_add_tail(ctx->net, trans);
6669
6670         return 0;
6671 err1:
6672         kfree(trans);
6673         return err;
6674 }
6675
6676 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6677                                     struct nft_set *set,
6678                                     struct nft_set_elem *elem)
6679 {
6680         struct nft_trans *trans;
6681
6682         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6683                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6684         if (!trans)
6685                 return -ENOMEM;
6686
6687         nft_setelem_data_deactivate(ctx->net, set, elem);
6688         nft_trans_elem_set(trans) = set;
6689         nft_trans_elem(trans) = *elem;
6690         nft_trans_commit_list_add_tail(ctx->net, trans);
6691
6692         return 0;
6693 }
6694
6695 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6696                                   struct nft_set *set)
6697 {
6698         u8 genmask = nft_genmask_next(ctx->net);
6699         struct nft_set_elem_catchall *catchall;
6700         struct nft_set_elem elem;
6701         struct nft_set_ext *ext;
6702         int ret = 0;
6703
6704         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6705                 ext = nft_set_elem_ext(set, catchall->elem);
6706                 if (!nft_set_elem_active(ext, genmask) ||
6707                     nft_set_elem_mark_busy(ext))
6708                         continue;
6709
6710                 elem.priv = catchall->elem;
6711                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6712                 if (ret < 0)
6713                         break;
6714         }
6715
6716         return ret;
6717 }
6718
6719 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6720 {
6721         struct nft_set_iter iter = {
6722                 .genmask        = genmask,
6723                 .fn             = nft_setelem_flush,
6724         };
6725
6726         set->ops->walk(ctx, set, &iter);
6727         if (!iter.err)
6728                 iter.err = nft_set_catchall_flush(ctx, set);
6729
6730         return iter.err;
6731 }
6732
6733 static int nf_tables_delsetelem(struct sk_buff *skb,
6734                                 const struct nfnl_info *info,
6735                                 const struct nlattr * const nla[])
6736 {
6737         struct netlink_ext_ack *extack = info->extack;
6738         u8 genmask = nft_genmask_next(info->net);
6739         u8 family = info->nfmsg->nfgen_family;
6740         struct net *net = info->net;
6741         const struct nlattr *attr;
6742         struct nft_table *table;
6743         struct nft_set *set;
6744         struct nft_ctx ctx;
6745         int rem, err = 0;
6746
6747         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6748                                  genmask, NETLINK_CB(skb).portid);
6749         if (IS_ERR(table)) {
6750                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6751                 return PTR_ERR(table);
6752         }
6753
6754         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6755         if (IS_ERR(set))
6756                 return PTR_ERR(set);
6757         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6758                 return -EBUSY;
6759
6760         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6761
6762         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6763                 return nft_set_flush(&ctx, set, genmask);
6764
6765         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6766                 err = nft_del_setelem(&ctx, set, attr);
6767                 if (err == -ENOENT &&
6768                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
6769                         continue;
6770
6771                 if (err < 0) {
6772                         NL_SET_BAD_ATTR(extack, attr);
6773                         break;
6774                 }
6775         }
6776         return err;
6777 }
6778
6779 void nft_set_gc_batch_release(struct rcu_head *rcu)
6780 {
6781         struct nft_set_gc_batch *gcb;
6782         unsigned int i;
6783
6784         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6785         for (i = 0; i < gcb->head.cnt; i++)
6786                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6787         kfree(gcb);
6788 }
6789
6790 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6791                                                 gfp_t gfp)
6792 {
6793         struct nft_set_gc_batch *gcb;
6794
6795         gcb = kzalloc(sizeof(*gcb), gfp);
6796         if (gcb == NULL)
6797                 return gcb;
6798         gcb->head.set = set;
6799         return gcb;
6800 }
6801
6802 /*
6803  * Stateful objects
6804  */
6805
6806 /**
6807  *      nft_register_obj- register nf_tables stateful object type
6808  *      @obj_type: object type
6809  *
6810  *      Registers the object type for use with nf_tables. Returns zero on
6811  *      success or a negative errno code otherwise.
6812  */
6813 int nft_register_obj(struct nft_object_type *obj_type)
6814 {
6815         if (obj_type->type == NFT_OBJECT_UNSPEC)
6816                 return -EINVAL;
6817
6818         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6819         list_add_rcu(&obj_type->list, &nf_tables_objects);
6820         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6821         return 0;
6822 }
6823 EXPORT_SYMBOL_GPL(nft_register_obj);
6824
6825 /**
6826  *      nft_unregister_obj - unregister nf_tables object type
6827  *      @obj_type: object type
6828  *
6829  *      Unregisters the object type for use with nf_tables.
6830  */
6831 void nft_unregister_obj(struct nft_object_type *obj_type)
6832 {
6833         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6834         list_del_rcu(&obj_type->list);
6835         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6836 }
6837 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6838
6839 struct nft_object *nft_obj_lookup(const struct net *net,
6840                                   const struct nft_table *table,
6841                                   const struct nlattr *nla, u32 objtype,
6842                                   u8 genmask)
6843 {
6844         struct nft_object_hash_key k = { .table = table };
6845         char search[NFT_OBJ_MAXNAMELEN];
6846         struct rhlist_head *tmp, *list;
6847         struct nft_object *obj;
6848
6849         nla_strscpy(search, nla, sizeof(search));
6850         k.name = search;
6851
6852         WARN_ON_ONCE(!rcu_read_lock_held() &&
6853                      !lockdep_commit_lock_is_held(net));
6854
6855         rcu_read_lock();
6856         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6857         if (!list)
6858                 goto out;
6859
6860         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6861                 if (objtype == obj->ops->type->type &&
6862                     nft_active_genmask(obj, genmask)) {
6863                         rcu_read_unlock();
6864                         return obj;
6865                 }
6866         }
6867 out:
6868         rcu_read_unlock();
6869         return ERR_PTR(-ENOENT);
6870 }
6871 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6872
6873 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6874                                                   const struct nlattr *nla,
6875                                                   u32 objtype, u8 genmask)
6876 {
6877         struct nft_object *obj;
6878
6879         list_for_each_entry(obj, &table->objects, list) {
6880                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6881                     objtype == obj->ops->type->type &&
6882                     nft_active_genmask(obj, genmask))
6883                         return obj;
6884         }
6885         return ERR_PTR(-ENOENT);
6886 }
6887
6888 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6889         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6890                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6891         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6892                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6893         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6894         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6895         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6896         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6897                                     .len = NFT_USERDATA_MAXLEN },
6898 };
6899
6900 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6901                                        const struct nft_object_type *type,
6902                                        const struct nlattr *attr)
6903 {
6904         struct nlattr **tb;
6905         const struct nft_object_ops *ops;
6906         struct nft_object *obj;
6907         int err = -ENOMEM;
6908
6909         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6910         if (!tb)
6911                 goto err1;
6912
6913         if (attr) {
6914                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6915                                                   type->policy, NULL);
6916                 if (err < 0)
6917                         goto err2;
6918         } else {
6919                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6920         }
6921
6922         if (type->select_ops) {
6923                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6924                 if (IS_ERR(ops)) {
6925                         err = PTR_ERR(ops);
6926                         goto err2;
6927                 }
6928         } else {
6929                 ops = type->ops;
6930         }
6931
6932         err = -ENOMEM;
6933         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6934         if (!obj)
6935                 goto err2;
6936
6937         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6938         if (err < 0)
6939                 goto err3;
6940
6941         obj->ops = ops;
6942
6943         kfree(tb);
6944         return obj;
6945 err3:
6946         kfree(obj);
6947 err2:
6948         kfree(tb);
6949 err1:
6950         return ERR_PTR(err);
6951 }
6952
6953 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6954                            struct nft_object *obj, bool reset)
6955 {
6956         struct nlattr *nest;
6957
6958         nest = nla_nest_start_noflag(skb, attr);
6959         if (!nest)
6960                 goto nla_put_failure;
6961         if (obj->ops->dump(skb, obj, reset) < 0)
6962                 goto nla_put_failure;
6963         nla_nest_end(skb, nest);
6964         return 0;
6965
6966 nla_put_failure:
6967         return -1;
6968 }
6969
6970 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6971 {
6972         const struct nft_object_type *type;
6973
6974         list_for_each_entry(type, &nf_tables_objects, list) {
6975                 if (objtype == type->type)
6976                         return type;
6977         }
6978         return NULL;
6979 }
6980
6981 static const struct nft_object_type *
6982 nft_obj_type_get(struct net *net, u32 objtype)
6983 {
6984         const struct nft_object_type *type;
6985
6986         type = __nft_obj_type_get(objtype);
6987         if (type != NULL && try_module_get(type->owner))
6988                 return type;
6989
6990         lockdep_nfnl_nft_mutex_not_held();
6991 #ifdef CONFIG_MODULES
6992         if (type == NULL) {
6993                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6994                         return ERR_PTR(-EAGAIN);
6995         }
6996 #endif
6997         return ERR_PTR(-ENOENT);
6998 }
6999
7000 static int nf_tables_updobj(const struct nft_ctx *ctx,
7001                             const struct nft_object_type *type,
7002                             const struct nlattr *attr,
7003                             struct nft_object *obj)
7004 {
7005         struct nft_object *newobj;
7006         struct nft_trans *trans;
7007         int err = -ENOMEM;
7008
7009         if (!try_module_get(type->owner))
7010                 return -ENOENT;
7011
7012         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7013                                 sizeof(struct nft_trans_obj));
7014         if (!trans)
7015                 goto err_trans;
7016
7017         newobj = nft_obj_init(ctx, type, attr);
7018         if (IS_ERR(newobj)) {
7019                 err = PTR_ERR(newobj);
7020                 goto err_free_trans;
7021         }
7022
7023         nft_trans_obj(trans) = obj;
7024         nft_trans_obj_update(trans) = true;
7025         nft_trans_obj_newobj(trans) = newobj;
7026         nft_trans_commit_list_add_tail(ctx->net, trans);
7027
7028         return 0;
7029
7030 err_free_trans:
7031         kfree(trans);
7032 err_trans:
7033         module_put(type->owner);
7034         return err;
7035 }
7036
7037 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7038                             const struct nlattr * const nla[])
7039 {
7040         struct netlink_ext_ack *extack = info->extack;
7041         u8 genmask = nft_genmask_next(info->net);
7042         u8 family = info->nfmsg->nfgen_family;
7043         const struct nft_object_type *type;
7044         struct net *net = info->net;
7045         struct nft_table *table;
7046         struct nft_object *obj;
7047         struct nft_ctx ctx;
7048         u32 objtype;
7049         int err;
7050
7051         if (!nla[NFTA_OBJ_TYPE] ||
7052             !nla[NFTA_OBJ_NAME] ||
7053             !nla[NFTA_OBJ_DATA])
7054                 return -EINVAL;
7055
7056         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7057                                  NETLINK_CB(skb).portid);
7058         if (IS_ERR(table)) {
7059                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7060                 return PTR_ERR(table);
7061         }
7062
7063         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7064         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7065         if (IS_ERR(obj)) {
7066                 err = PTR_ERR(obj);
7067                 if (err != -ENOENT) {
7068                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7069                         return err;
7070                 }
7071         } else {
7072                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7073                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7074                         return -EEXIST;
7075                 }
7076                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7077                         return -EOPNOTSUPP;
7078
7079                 type = __nft_obj_type_get(objtype);
7080                 if (WARN_ON_ONCE(!type))
7081                         return -ENOENT;
7082
7083                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7084
7085                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7086         }
7087
7088         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7089
7090         type = nft_obj_type_get(net, objtype);
7091         if (IS_ERR(type))
7092                 return PTR_ERR(type);
7093
7094         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7095         if (IS_ERR(obj)) {
7096                 err = PTR_ERR(obj);
7097                 goto err_init;
7098         }
7099         obj->key.table = table;
7100         obj->handle = nf_tables_alloc_handle(table);
7101
7102         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7103         if (!obj->key.name) {
7104                 err = -ENOMEM;
7105                 goto err_strdup;
7106         }
7107
7108         if (nla[NFTA_OBJ_USERDATA]) {
7109                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7110                 if (obj->udata == NULL)
7111                         goto err_userdata;
7112
7113                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7114         }
7115
7116         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7117         if (err < 0)
7118                 goto err_trans;
7119
7120         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7121                               nft_objname_ht_params);
7122         if (err < 0)
7123                 goto err_obj_ht;
7124
7125         list_add_tail_rcu(&obj->list, &table->objects);
7126         table->use++;
7127         return 0;
7128 err_obj_ht:
7129         /* queued in transaction log */
7130         INIT_LIST_HEAD(&obj->list);
7131         return err;
7132 err_trans:
7133         kfree(obj->udata);
7134 err_userdata:
7135         kfree(obj->key.name);
7136 err_strdup:
7137         if (obj->ops->destroy)
7138                 obj->ops->destroy(&ctx, obj);
7139         kfree(obj);
7140 err_init:
7141         module_put(type->owner);
7142         return err;
7143 }
7144
7145 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7146                                    u32 portid, u32 seq, int event, u32 flags,
7147                                    int family, const struct nft_table *table,
7148                                    struct nft_object *obj, bool reset)
7149 {
7150         struct nlmsghdr *nlh;
7151
7152         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7153         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7154                            NFNETLINK_V0, nft_base_seq(net));
7155         if (!nlh)
7156                 goto nla_put_failure;
7157
7158         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7159             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7160             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7161             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7162             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
7163             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7164                          NFTA_OBJ_PAD))
7165                 goto nla_put_failure;
7166
7167         if (obj->udata &&
7168             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7169                 goto nla_put_failure;
7170
7171         nlmsg_end(skb, nlh);
7172         return 0;
7173
7174 nla_put_failure:
7175         nlmsg_trim(skb, nlh);
7176         return -1;
7177 }
7178
7179 struct nft_obj_filter {
7180         char            *table;
7181         u32             type;
7182 };
7183
7184 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7185 {
7186         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7187         const struct nft_table *table;
7188         unsigned int idx = 0, s_idx = cb->args[0];
7189         struct nft_obj_filter *filter = cb->data;
7190         struct net *net = sock_net(skb->sk);
7191         int family = nfmsg->nfgen_family;
7192         struct nftables_pernet *nft_net;
7193         struct nft_object *obj;
7194         bool reset = false;
7195
7196         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7197                 reset = true;
7198
7199         rcu_read_lock();
7200         nft_net = nft_pernet(net);
7201         cb->seq = READ_ONCE(nft_net->base_seq);
7202
7203         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7204                 if (family != NFPROTO_UNSPEC && family != table->family)
7205                         continue;
7206
7207                 list_for_each_entry_rcu(obj, &table->objects, list) {
7208                         if (!nft_is_active(net, obj))
7209                                 goto cont;
7210                         if (idx < s_idx)
7211                                 goto cont;
7212                         if (idx > s_idx)
7213                                 memset(&cb->args[1], 0,
7214                                        sizeof(cb->args) - sizeof(cb->args[0]));
7215                         if (filter && filter->table &&
7216                             strcmp(filter->table, table->name))
7217                                 goto cont;
7218                         if (filter &&
7219                             filter->type != NFT_OBJECT_UNSPEC &&
7220                             obj->ops->type->type != filter->type)
7221                                 goto cont;
7222                         if (reset) {
7223                                 char *buf = kasprintf(GFP_ATOMIC,
7224                                                       "%s:%u",
7225                                                       table->name,
7226                                                       nft_net->base_seq);
7227
7228                                 audit_log_nfcfg(buf,
7229                                                 family,
7230                                                 obj->handle,
7231                                                 AUDIT_NFT_OP_OBJ_RESET,
7232                                                 GFP_ATOMIC);
7233                                 kfree(buf);
7234                         }
7235
7236                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7237                                                     cb->nlh->nlmsg_seq,
7238                                                     NFT_MSG_NEWOBJ,
7239                                                     NLM_F_MULTI | NLM_F_APPEND,
7240                                                     table->family, table,
7241                                                     obj, reset) < 0)
7242                                 goto done;
7243
7244                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7245 cont:
7246                         idx++;
7247                 }
7248         }
7249 done:
7250         rcu_read_unlock();
7251
7252         cb->args[0] = idx;
7253         return skb->len;
7254 }
7255
7256 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7257 {
7258         const struct nlattr * const *nla = cb->data;
7259         struct nft_obj_filter *filter = NULL;
7260
7261         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7262                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7263                 if (!filter)
7264                         return -ENOMEM;
7265
7266                 if (nla[NFTA_OBJ_TABLE]) {
7267                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7268                         if (!filter->table) {
7269                                 kfree(filter);
7270                                 return -ENOMEM;
7271                         }
7272                 }
7273
7274                 if (nla[NFTA_OBJ_TYPE])
7275                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7276         }
7277
7278         cb->data = filter;
7279         return 0;
7280 }
7281
7282 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7283 {
7284         struct nft_obj_filter *filter = cb->data;
7285
7286         if (filter) {
7287                 kfree(filter->table);
7288                 kfree(filter);
7289         }
7290
7291         return 0;
7292 }
7293
7294 /* called with rcu_read_lock held */
7295 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7296                             const struct nlattr * const nla[])
7297 {
7298         struct netlink_ext_ack *extack = info->extack;
7299         u8 genmask = nft_genmask_cur(info->net);
7300         u8 family = info->nfmsg->nfgen_family;
7301         const struct nft_table *table;
7302         struct net *net = info->net;
7303         struct nft_object *obj;
7304         struct sk_buff *skb2;
7305         bool reset = false;
7306         u32 objtype;
7307         int err;
7308
7309         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7310                 struct netlink_dump_control c = {
7311                         .start = nf_tables_dump_obj_start,
7312                         .dump = nf_tables_dump_obj,
7313                         .done = nf_tables_dump_obj_done,
7314                         .module = THIS_MODULE,
7315                         .data = (void *)nla,
7316                 };
7317
7318                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7319         }
7320
7321         if (!nla[NFTA_OBJ_NAME] ||
7322             !nla[NFTA_OBJ_TYPE])
7323                 return -EINVAL;
7324
7325         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7326         if (IS_ERR(table)) {
7327                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7328                 return PTR_ERR(table);
7329         }
7330
7331         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7332         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7333         if (IS_ERR(obj)) {
7334                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7335                 return PTR_ERR(obj);
7336         }
7337
7338         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7339         if (!skb2)
7340                 return -ENOMEM;
7341
7342         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7343                 reset = true;
7344
7345         if (reset) {
7346                 const struct nftables_pernet *nft_net;
7347                 char *buf;
7348
7349                 nft_net = nft_pernet(net);
7350                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7351
7352                 audit_log_nfcfg(buf,
7353                                 family,
7354                                 obj->handle,
7355                                 AUDIT_NFT_OP_OBJ_RESET,
7356                                 GFP_ATOMIC);
7357                 kfree(buf);
7358         }
7359
7360         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7361                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7362                                       family, table, obj, reset);
7363         if (err < 0)
7364                 goto err_fill_obj_info;
7365
7366         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7367
7368 err_fill_obj_info:
7369         kfree_skb(skb2);
7370         return err;
7371 }
7372
7373 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7374 {
7375         if (obj->ops->destroy)
7376                 obj->ops->destroy(ctx, obj);
7377
7378         module_put(obj->ops->type->owner);
7379         kfree(obj->key.name);
7380         kfree(obj->udata);
7381         kfree(obj);
7382 }
7383
7384 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7385                             const struct nlattr * const nla[])
7386 {
7387         struct netlink_ext_ack *extack = info->extack;
7388         u8 genmask = nft_genmask_next(info->net);
7389         u8 family = info->nfmsg->nfgen_family;
7390         struct net *net = info->net;
7391         const struct nlattr *attr;
7392         struct nft_table *table;
7393         struct nft_object *obj;
7394         struct nft_ctx ctx;
7395         u32 objtype;
7396
7397         if (!nla[NFTA_OBJ_TYPE] ||
7398             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7399                 return -EINVAL;
7400
7401         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7402                                  NETLINK_CB(skb).portid);
7403         if (IS_ERR(table)) {
7404                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7405                 return PTR_ERR(table);
7406         }
7407
7408         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7409         if (nla[NFTA_OBJ_HANDLE]) {
7410                 attr = nla[NFTA_OBJ_HANDLE];
7411                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7412         } else {
7413                 attr = nla[NFTA_OBJ_NAME];
7414                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7415         }
7416
7417         if (IS_ERR(obj)) {
7418                 if (PTR_ERR(obj) == -ENOENT &&
7419                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7420                         return 0;
7421
7422                 NL_SET_BAD_ATTR(extack, attr);
7423                 return PTR_ERR(obj);
7424         }
7425         if (obj->use > 0) {
7426                 NL_SET_BAD_ATTR(extack, attr);
7427                 return -EBUSY;
7428         }
7429
7430         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7431
7432         return nft_delobj(&ctx, obj);
7433 }
7434
7435 void nft_obj_notify(struct net *net, const struct nft_table *table,
7436                     struct nft_object *obj, u32 portid, u32 seq, int event,
7437                     u16 flags, int family, int report, gfp_t gfp)
7438 {
7439         struct nftables_pernet *nft_net = nft_pernet(net);
7440         struct sk_buff *skb;
7441         int err;
7442         char *buf = kasprintf(gfp, "%s:%u",
7443                               table->name, nft_net->base_seq);
7444
7445         audit_log_nfcfg(buf,
7446                         family,
7447                         obj->handle,
7448                         event == NFT_MSG_NEWOBJ ?
7449                                  AUDIT_NFT_OP_OBJ_REGISTER :
7450                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7451                         gfp);
7452         kfree(buf);
7453
7454         if (!report &&
7455             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7456                 return;
7457
7458         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7459         if (skb == NULL)
7460                 goto err;
7461
7462         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7463                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7464                                       family, table, obj, false);
7465         if (err < 0) {
7466                 kfree_skb(skb);
7467                 goto err;
7468         }
7469
7470         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7471         return;
7472 err:
7473         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7474 }
7475 EXPORT_SYMBOL_GPL(nft_obj_notify);
7476
7477 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7478                                  struct nft_object *obj, int event)
7479 {
7480         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7481                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7482 }
7483
7484 /*
7485  * Flow tables
7486  */
7487 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7488 {
7489         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7490         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7491         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7492 }
7493 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7494
7495 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7496 {
7497         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7498         list_del_rcu(&type->list);
7499         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7500 }
7501 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7502
7503 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7504         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7505                                             .len = NFT_NAME_MAXLEN - 1 },
7506         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7507                                             .len = NFT_NAME_MAXLEN - 1 },
7508         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7509         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7510         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7511 };
7512
7513 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7514                                            const struct nlattr *nla, u8 genmask)
7515 {
7516         struct nft_flowtable *flowtable;
7517
7518         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7519                 if (!nla_strcmp(nla, flowtable->name) &&
7520                     nft_active_genmask(flowtable, genmask))
7521                         return flowtable;
7522         }
7523         return ERR_PTR(-ENOENT);
7524 }
7525 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7526
7527 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7528                                     struct nft_flowtable *flowtable,
7529                                     enum nft_trans_phase phase)
7530 {
7531         switch (phase) {
7532         case NFT_TRANS_PREPARE:
7533         case NFT_TRANS_ABORT:
7534         case NFT_TRANS_RELEASE:
7535                 flowtable->use--;
7536                 fallthrough;
7537         default:
7538                 return;
7539         }
7540 }
7541 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7542
7543 static struct nft_flowtable *
7544 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7545                               const struct nlattr *nla, u8 genmask)
7546 {
7547        struct nft_flowtable *flowtable;
7548
7549        list_for_each_entry(flowtable, &table->flowtables, list) {
7550                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7551                    nft_active_genmask(flowtable, genmask))
7552                        return flowtable;
7553        }
7554        return ERR_PTR(-ENOENT);
7555 }
7556
7557 struct nft_flowtable_hook {
7558         u32                     num;
7559         int                     priority;
7560         struct list_head        list;
7561 };
7562
7563 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7564         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7565         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7566         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7567 };
7568
7569 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7570                                     const struct nlattr *attr,
7571                                     struct nft_flowtable_hook *flowtable_hook,
7572                                     struct nft_flowtable *flowtable, bool add)
7573 {
7574         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7575         struct nft_hook *hook;
7576         int hooknum, priority;
7577         int err;
7578
7579         INIT_LIST_HEAD(&flowtable_hook->list);
7580
7581         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7582                                           nft_flowtable_hook_policy, NULL);
7583         if (err < 0)
7584                 return err;
7585
7586         if (add) {
7587                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7588                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7589                         return -EINVAL;
7590
7591                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7592                 if (hooknum != NF_NETDEV_INGRESS)
7593                         return -EOPNOTSUPP;
7594
7595                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7596
7597                 flowtable_hook->priority        = priority;
7598                 flowtable_hook->num             = hooknum;
7599         } else {
7600                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7601                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7602                         if (hooknum != flowtable->hooknum)
7603                                 return -EOPNOTSUPP;
7604                 }
7605
7606                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7607                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7608                         if (priority != flowtable->data.priority)
7609                                 return -EOPNOTSUPP;
7610                 }
7611
7612                 flowtable_hook->priority        = flowtable->data.priority;
7613                 flowtable_hook->num             = flowtable->hooknum;
7614         }
7615
7616         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7617                 err = nf_tables_parse_netdev_hooks(ctx->net,
7618                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7619                                                    &flowtable_hook->list);
7620                 if (err < 0)
7621                         return err;
7622         }
7623
7624         list_for_each_entry(hook, &flowtable_hook->list, list) {
7625                 hook->ops.pf            = NFPROTO_NETDEV;
7626                 hook->ops.hooknum       = flowtable_hook->num;
7627                 hook->ops.priority      = flowtable_hook->priority;
7628                 hook->ops.priv          = &flowtable->data;
7629                 hook->ops.hook          = flowtable->data.type->hook;
7630         }
7631
7632         return err;
7633 }
7634
7635 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7636 {
7637         const struct nf_flowtable_type *type;
7638
7639         list_for_each_entry(type, &nf_tables_flowtables, list) {
7640                 if (family == type->family)
7641                         return type;
7642         }
7643         return NULL;
7644 }
7645
7646 static const struct nf_flowtable_type *
7647 nft_flowtable_type_get(struct net *net, u8 family)
7648 {
7649         const struct nf_flowtable_type *type;
7650
7651         type = __nft_flowtable_type_get(family);
7652         if (type != NULL && try_module_get(type->owner))
7653                 return type;
7654
7655         lockdep_nfnl_nft_mutex_not_held();
7656 #ifdef CONFIG_MODULES
7657         if (type == NULL) {
7658                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7659                         return ERR_PTR(-EAGAIN);
7660         }
7661 #endif
7662         return ERR_PTR(-ENOENT);
7663 }
7664
7665 /* Only called from error and netdev event paths. */
7666 static void nft_unregister_flowtable_hook(struct net *net,
7667                                           struct nft_flowtable *flowtable,
7668                                           struct nft_hook *hook)
7669 {
7670         nf_unregister_net_hook(net, &hook->ops);
7671         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7672                                     FLOW_BLOCK_UNBIND);
7673 }
7674
7675 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7676                                                  struct list_head *hook_list,
7677                                                  bool release_netdev)
7678 {
7679         struct nft_hook *hook, *next;
7680
7681         list_for_each_entry_safe(hook, next, hook_list, list) {
7682                 nf_unregister_net_hook(net, &hook->ops);
7683                 if (release_netdev) {
7684                         list_del(&hook->list);
7685                         kfree_rcu(hook, rcu);
7686                 }
7687         }
7688 }
7689
7690 static void nft_unregister_flowtable_net_hooks(struct net *net,
7691                                                struct list_head *hook_list)
7692 {
7693         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7694 }
7695
7696 static int nft_register_flowtable_net_hooks(struct net *net,
7697                                             struct nft_table *table,
7698                                             struct list_head *hook_list,
7699                                             struct nft_flowtable *flowtable)
7700 {
7701         struct nft_hook *hook, *hook2, *next;
7702         struct nft_flowtable *ft;
7703         int err, i = 0;
7704
7705         list_for_each_entry(hook, hook_list, list) {
7706                 list_for_each_entry(ft, &table->flowtables, list) {
7707                         if (!nft_is_active_next(net, ft))
7708                                 continue;
7709
7710                         list_for_each_entry(hook2, &ft->hook_list, list) {
7711                                 if (hook->ops.dev == hook2->ops.dev &&
7712                                     hook->ops.pf == hook2->ops.pf) {
7713                                         err = -EEXIST;
7714                                         goto err_unregister_net_hooks;
7715                                 }
7716                         }
7717                 }
7718
7719                 err = flowtable->data.type->setup(&flowtable->data,
7720                                                   hook->ops.dev,
7721                                                   FLOW_BLOCK_BIND);
7722                 if (err < 0)
7723                         goto err_unregister_net_hooks;
7724
7725                 err = nf_register_net_hook(net, &hook->ops);
7726                 if (err < 0) {
7727                         flowtable->data.type->setup(&flowtable->data,
7728                                                     hook->ops.dev,
7729                                                     FLOW_BLOCK_UNBIND);
7730                         goto err_unregister_net_hooks;
7731                 }
7732
7733                 i++;
7734         }
7735
7736         return 0;
7737
7738 err_unregister_net_hooks:
7739         list_for_each_entry_safe(hook, next, hook_list, list) {
7740                 if (i-- <= 0)
7741                         break;
7742
7743                 nft_unregister_flowtable_hook(net, flowtable, hook);
7744                 list_del_rcu(&hook->list);
7745                 kfree_rcu(hook, rcu);
7746         }
7747
7748         return err;
7749 }
7750
7751 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7752 {
7753         struct nft_hook *hook, *next;
7754
7755         list_for_each_entry_safe(hook, next, hook_list, list) {
7756                 list_del_rcu(&hook->list);
7757                 kfree_rcu(hook, rcu);
7758         }
7759 }
7760
7761 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7762                                 struct nft_flowtable *flowtable)
7763 {
7764         const struct nlattr * const *nla = ctx->nla;
7765         struct nft_flowtable_hook flowtable_hook;
7766         struct nft_hook *hook, *next;
7767         struct nft_trans *trans;
7768         bool unregister = false;
7769         u32 flags;
7770         int err;
7771
7772         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7773                                        &flowtable_hook, flowtable, false);
7774         if (err < 0)
7775                 return err;
7776
7777         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7778                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7779                         list_del(&hook->list);
7780                         kfree(hook);
7781                 }
7782         }
7783
7784         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7785                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7786                 if (flags & ~NFT_FLOWTABLE_MASK) {
7787                         err = -EOPNOTSUPP;
7788                         goto err_flowtable_update_hook;
7789                 }
7790                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7791                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7792                         err = -EOPNOTSUPP;
7793                         goto err_flowtable_update_hook;
7794                 }
7795         } else {
7796                 flags = flowtable->data.flags;
7797         }
7798
7799         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7800                                                &flowtable_hook.list, flowtable);
7801         if (err < 0)
7802                 goto err_flowtable_update_hook;
7803
7804         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7805                                 sizeof(struct nft_trans_flowtable));
7806         if (!trans) {
7807                 unregister = true;
7808                 err = -ENOMEM;
7809                 goto err_flowtable_update_hook;
7810         }
7811
7812         nft_trans_flowtable_flags(trans) = flags;
7813         nft_trans_flowtable(trans) = flowtable;
7814         nft_trans_flowtable_update(trans) = true;
7815         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7816         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7817
7818         nft_trans_commit_list_add_tail(ctx->net, trans);
7819
7820         return 0;
7821
7822 err_flowtable_update_hook:
7823         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7824                 if (unregister)
7825                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7826                 list_del_rcu(&hook->list);
7827                 kfree_rcu(hook, rcu);
7828         }
7829
7830         return err;
7831
7832 }
7833
7834 static int nf_tables_newflowtable(struct sk_buff *skb,
7835                                   const struct nfnl_info *info,
7836                                   const struct nlattr * const nla[])
7837 {
7838         struct netlink_ext_ack *extack = info->extack;
7839         struct nft_flowtable_hook flowtable_hook;
7840         u8 genmask = nft_genmask_next(info->net);
7841         u8 family = info->nfmsg->nfgen_family;
7842         const struct nf_flowtable_type *type;
7843         struct nft_flowtable *flowtable;
7844         struct nft_hook *hook, *next;
7845         struct net *net = info->net;
7846         struct nft_table *table;
7847         struct nft_ctx ctx;
7848         int err;
7849
7850         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7851             !nla[NFTA_FLOWTABLE_NAME] ||
7852             !nla[NFTA_FLOWTABLE_HOOK])
7853                 return -EINVAL;
7854
7855         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7856                                  genmask, NETLINK_CB(skb).portid);
7857         if (IS_ERR(table)) {
7858                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7859                 return PTR_ERR(table);
7860         }
7861
7862         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7863                                          genmask);
7864         if (IS_ERR(flowtable)) {
7865                 err = PTR_ERR(flowtable);
7866                 if (err != -ENOENT) {
7867                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7868                         return err;
7869                 }
7870         } else {
7871                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7872                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7873                         return -EEXIST;
7874                 }
7875
7876                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7877
7878                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7879         }
7880
7881         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7882
7883         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7884         if (!flowtable)
7885                 return -ENOMEM;
7886
7887         flowtable->table = table;
7888         flowtable->handle = nf_tables_alloc_handle(table);
7889         INIT_LIST_HEAD(&flowtable->hook_list);
7890
7891         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7892         if (!flowtable->name) {
7893                 err = -ENOMEM;
7894                 goto err1;
7895         }
7896
7897         type = nft_flowtable_type_get(net, family);
7898         if (IS_ERR(type)) {
7899                 err = PTR_ERR(type);
7900                 goto err2;
7901         }
7902
7903         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7904                 flowtable->data.flags =
7905                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7906                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7907                         err = -EOPNOTSUPP;
7908                         goto err3;
7909                 }
7910         }
7911
7912         write_pnet(&flowtable->data.net, net);
7913         flowtable->data.type = type;
7914         err = type->init(&flowtable->data);
7915         if (err < 0)
7916                 goto err3;
7917
7918         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7919                                        &flowtable_hook, flowtable, true);
7920         if (err < 0)
7921                 goto err4;
7922
7923         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7924         flowtable->data.priority = flowtable_hook.priority;
7925         flowtable->hooknum = flowtable_hook.num;
7926
7927         err = nft_register_flowtable_net_hooks(ctx.net, table,
7928                                                &flowtable->hook_list,
7929                                                flowtable);
7930         if (err < 0) {
7931                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7932                 goto err4;
7933         }
7934
7935         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7936         if (err < 0)
7937                 goto err5;
7938
7939         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7940         table->use++;
7941
7942         return 0;
7943 err5:
7944         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7945                 nft_unregister_flowtable_hook(net, flowtable, hook);
7946                 list_del_rcu(&hook->list);
7947                 kfree_rcu(hook, rcu);
7948         }
7949 err4:
7950         flowtable->data.type->free(&flowtable->data);
7951 err3:
7952         module_put(type->owner);
7953 err2:
7954         kfree(flowtable->name);
7955 err1:
7956         kfree(flowtable);
7957         return err;
7958 }
7959
7960 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7961 {
7962         struct nft_hook *this, *next;
7963
7964         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7965                 list_del(&this->list);
7966                 kfree(this);
7967         }
7968 }
7969
7970 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7971                                  struct nft_flowtable *flowtable)
7972 {
7973         const struct nlattr * const *nla = ctx->nla;
7974         struct nft_flowtable_hook flowtable_hook;
7975         LIST_HEAD(flowtable_del_list);
7976         struct nft_hook *this, *hook;
7977         struct nft_trans *trans;
7978         int err;
7979
7980         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7981                                        &flowtable_hook, flowtable, false);
7982         if (err < 0)
7983                 return err;
7984
7985         list_for_each_entry(this, &flowtable_hook.list, list) {
7986                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7987                 if (!hook) {
7988                         err = -ENOENT;
7989                         goto err_flowtable_del_hook;
7990                 }
7991                 list_move(&hook->list, &flowtable_del_list);
7992         }
7993
7994         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7995                                 sizeof(struct nft_trans_flowtable));
7996         if (!trans) {
7997                 err = -ENOMEM;
7998                 goto err_flowtable_del_hook;
7999         }
8000
8001         nft_trans_flowtable(trans) = flowtable;
8002         nft_trans_flowtable_update(trans) = true;
8003         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8004         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8005         nft_flowtable_hook_release(&flowtable_hook);
8006
8007         nft_trans_commit_list_add_tail(ctx->net, trans);
8008
8009         return 0;
8010
8011 err_flowtable_del_hook:
8012         list_splice(&flowtable_del_list, &flowtable->hook_list);
8013         nft_flowtable_hook_release(&flowtable_hook);
8014
8015         return err;
8016 }
8017
8018 static int nf_tables_delflowtable(struct sk_buff *skb,
8019                                   const struct nfnl_info *info,
8020                                   const struct nlattr * const nla[])
8021 {
8022         struct netlink_ext_ack *extack = info->extack;
8023         u8 genmask = nft_genmask_next(info->net);
8024         u8 family = info->nfmsg->nfgen_family;
8025         struct nft_flowtable *flowtable;
8026         struct net *net = info->net;
8027         const struct nlattr *attr;
8028         struct nft_table *table;
8029         struct nft_ctx ctx;
8030
8031         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8032             (!nla[NFTA_FLOWTABLE_NAME] &&
8033              !nla[NFTA_FLOWTABLE_HANDLE]))
8034                 return -EINVAL;
8035
8036         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8037                                  genmask, NETLINK_CB(skb).portid);
8038         if (IS_ERR(table)) {
8039                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8040                 return PTR_ERR(table);
8041         }
8042
8043         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8044                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8045                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8046         } else {
8047                 attr = nla[NFTA_FLOWTABLE_NAME];
8048                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8049         }
8050
8051         if (IS_ERR(flowtable)) {
8052                 if (PTR_ERR(flowtable) == -ENOENT &&
8053                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8054                         return 0;
8055
8056                 NL_SET_BAD_ATTR(extack, attr);
8057                 return PTR_ERR(flowtable);
8058         }
8059
8060         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8061
8062         if (nla[NFTA_FLOWTABLE_HOOK])
8063                 return nft_delflowtable_hook(&ctx, flowtable);
8064
8065         if (flowtable->use > 0) {
8066                 NL_SET_BAD_ATTR(extack, attr);
8067                 return -EBUSY;
8068         }
8069
8070         return nft_delflowtable(&ctx, flowtable);
8071 }
8072
8073 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8074                                          u32 portid, u32 seq, int event,
8075                                          u32 flags, int family,
8076                                          struct nft_flowtable *flowtable,
8077                                          struct list_head *hook_list)
8078 {
8079         struct nlattr *nest, *nest_devs;
8080         struct nft_hook *hook;
8081         struct nlmsghdr *nlh;
8082
8083         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8084         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8085                            NFNETLINK_V0, nft_base_seq(net));
8086         if (!nlh)
8087                 goto nla_put_failure;
8088
8089         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8090             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8091             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8092             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8093                          NFTA_FLOWTABLE_PAD) ||
8094             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8095                 goto nla_put_failure;
8096
8097         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8098         if (!nest)
8099                 goto nla_put_failure;
8100         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8101             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8102                 goto nla_put_failure;
8103
8104         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8105         if (!nest_devs)
8106                 goto nla_put_failure;
8107
8108         list_for_each_entry_rcu(hook, hook_list, list) {
8109                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8110                         goto nla_put_failure;
8111         }
8112         nla_nest_end(skb, nest_devs);
8113         nla_nest_end(skb, nest);
8114
8115         nlmsg_end(skb, nlh);
8116         return 0;
8117
8118 nla_put_failure:
8119         nlmsg_trim(skb, nlh);
8120         return -1;
8121 }
8122
8123 struct nft_flowtable_filter {
8124         char            *table;
8125 };
8126
8127 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8128                                     struct netlink_callback *cb)
8129 {
8130         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8131         struct nft_flowtable_filter *filter = cb->data;
8132         unsigned int idx = 0, s_idx = cb->args[0];
8133         struct net *net = sock_net(skb->sk);
8134         int family = nfmsg->nfgen_family;
8135         struct nft_flowtable *flowtable;
8136         struct nftables_pernet *nft_net;
8137         const struct nft_table *table;
8138
8139         rcu_read_lock();
8140         nft_net = nft_pernet(net);
8141         cb->seq = READ_ONCE(nft_net->base_seq);
8142
8143         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8144                 if (family != NFPROTO_UNSPEC && family != table->family)
8145                         continue;
8146
8147                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8148                         if (!nft_is_active(net, flowtable))
8149                                 goto cont;
8150                         if (idx < s_idx)
8151                                 goto cont;
8152                         if (idx > s_idx)
8153                                 memset(&cb->args[1], 0,
8154                                        sizeof(cb->args) - sizeof(cb->args[0]));
8155                         if (filter && filter->table &&
8156                             strcmp(filter->table, table->name))
8157                                 goto cont;
8158
8159                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8160                                                           cb->nlh->nlmsg_seq,
8161                                                           NFT_MSG_NEWFLOWTABLE,
8162                                                           NLM_F_MULTI | NLM_F_APPEND,
8163                                                           table->family,
8164                                                           flowtable,
8165                                                           &flowtable->hook_list) < 0)
8166                                 goto done;
8167
8168                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8169 cont:
8170                         idx++;
8171                 }
8172         }
8173 done:
8174         rcu_read_unlock();
8175
8176         cb->args[0] = idx;
8177         return skb->len;
8178 }
8179
8180 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8181 {
8182         const struct nlattr * const *nla = cb->data;
8183         struct nft_flowtable_filter *filter = NULL;
8184
8185         if (nla[NFTA_FLOWTABLE_TABLE]) {
8186                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8187                 if (!filter)
8188                         return -ENOMEM;
8189
8190                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8191                                            GFP_ATOMIC);
8192                 if (!filter->table) {
8193                         kfree(filter);
8194                         return -ENOMEM;
8195                 }
8196         }
8197
8198         cb->data = filter;
8199         return 0;
8200 }
8201
8202 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8203 {
8204         struct nft_flowtable_filter *filter = cb->data;
8205
8206         if (!filter)
8207                 return 0;
8208
8209         kfree(filter->table);
8210         kfree(filter);
8211
8212         return 0;
8213 }
8214
8215 /* called with rcu_read_lock held */
8216 static int nf_tables_getflowtable(struct sk_buff *skb,
8217                                   const struct nfnl_info *info,
8218                                   const struct nlattr * const nla[])
8219 {
8220         u8 genmask = nft_genmask_cur(info->net);
8221         u8 family = info->nfmsg->nfgen_family;
8222         struct nft_flowtable *flowtable;
8223         const struct nft_table *table;
8224         struct net *net = info->net;
8225         struct sk_buff *skb2;
8226         int err;
8227
8228         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8229                 struct netlink_dump_control c = {
8230                         .start = nf_tables_dump_flowtable_start,
8231                         .dump = nf_tables_dump_flowtable,
8232                         .done = nf_tables_dump_flowtable_done,
8233                         .module = THIS_MODULE,
8234                         .data = (void *)nla,
8235                 };
8236
8237                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8238         }
8239
8240         if (!nla[NFTA_FLOWTABLE_NAME])
8241                 return -EINVAL;
8242
8243         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8244                                  genmask, 0);
8245         if (IS_ERR(table))
8246                 return PTR_ERR(table);
8247
8248         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8249                                          genmask);
8250         if (IS_ERR(flowtable))
8251                 return PTR_ERR(flowtable);
8252
8253         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8254         if (!skb2)
8255                 return -ENOMEM;
8256
8257         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8258                                             info->nlh->nlmsg_seq,
8259                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8260                                             flowtable, &flowtable->hook_list);
8261         if (err < 0)
8262                 goto err_fill_flowtable_info;
8263
8264         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8265
8266 err_fill_flowtable_info:
8267         kfree_skb(skb2);
8268         return err;
8269 }
8270
8271 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8272                                        struct nft_flowtable *flowtable,
8273                                        struct list_head *hook_list,
8274                                        int event)
8275 {
8276         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8277         struct sk_buff *skb;
8278         u16 flags = 0;
8279         int err;
8280
8281         if (!ctx->report &&
8282             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8283                 return;
8284
8285         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8286         if (skb == NULL)
8287                 goto err;
8288
8289         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8290                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8291
8292         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8293                                             ctx->seq, event, flags,
8294                                             ctx->family, flowtable, hook_list);
8295         if (err < 0) {
8296                 kfree_skb(skb);
8297                 goto err;
8298         }
8299
8300         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8301         return;
8302 err:
8303         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8304 }
8305
8306 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8307 {
8308         struct nft_hook *hook, *next;
8309
8310         flowtable->data.type->free(&flowtable->data);
8311         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8312                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8313                                             FLOW_BLOCK_UNBIND);
8314                 list_del_rcu(&hook->list);
8315                 kfree(hook);
8316         }
8317         kfree(flowtable->name);
8318         module_put(flowtable->data.type->owner);
8319         kfree(flowtable);
8320 }
8321
8322 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8323                                    u32 portid, u32 seq)
8324 {
8325         struct nftables_pernet *nft_net = nft_pernet(net);
8326         struct nlmsghdr *nlh;
8327         char buf[TASK_COMM_LEN];
8328         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8329
8330         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8331                            NFNETLINK_V0, nft_base_seq(net));
8332         if (!nlh)
8333                 goto nla_put_failure;
8334
8335         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8336             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8337             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8338                 goto nla_put_failure;
8339
8340         nlmsg_end(skb, nlh);
8341         return 0;
8342
8343 nla_put_failure:
8344         nlmsg_trim(skb, nlh);
8345         return -EMSGSIZE;
8346 }
8347
8348 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8349                                 struct nft_flowtable *flowtable)
8350 {
8351         struct nft_hook *hook;
8352
8353         list_for_each_entry(hook, &flowtable->hook_list, list) {
8354                 if (hook->ops.dev != dev)
8355                         continue;
8356
8357                 /* flow_offload_netdev_event() cleans up entries for us. */
8358                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8359                 list_del_rcu(&hook->list);
8360                 kfree_rcu(hook, rcu);
8361                 break;
8362         }
8363 }
8364
8365 static int nf_tables_flowtable_event(struct notifier_block *this,
8366                                      unsigned long event, void *ptr)
8367 {
8368         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8369         struct nft_flowtable *flowtable;
8370         struct nftables_pernet *nft_net;
8371         struct nft_table *table;
8372         struct net *net;
8373
8374         if (event != NETDEV_UNREGISTER)
8375                 return 0;
8376
8377         net = dev_net(dev);
8378         nft_net = nft_pernet(net);
8379         mutex_lock(&nft_net->commit_mutex);
8380         list_for_each_entry(table, &nft_net->tables, list) {
8381                 list_for_each_entry(flowtable, &table->flowtables, list) {
8382                         nft_flowtable_event(event, dev, flowtable);
8383                 }
8384         }
8385         mutex_unlock(&nft_net->commit_mutex);
8386
8387         return NOTIFY_DONE;
8388 }
8389
8390 static struct notifier_block nf_tables_flowtable_notifier = {
8391         .notifier_call  = nf_tables_flowtable_event,
8392 };
8393
8394 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8395                                  int event)
8396 {
8397         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8398         struct sk_buff *skb2;
8399         int err;
8400
8401         if (!nlmsg_report(nlh) &&
8402             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8403                 return;
8404
8405         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8406         if (skb2 == NULL)
8407                 goto err;
8408
8409         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8410                                       nlh->nlmsg_seq);
8411         if (err < 0) {
8412                 kfree_skb(skb2);
8413                 goto err;
8414         }
8415
8416         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8417                        nlmsg_report(nlh), GFP_KERNEL);
8418         return;
8419 err:
8420         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8421                           -ENOBUFS);
8422 }
8423
8424 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8425                             const struct nlattr * const nla[])
8426 {
8427         struct sk_buff *skb2;
8428         int err;
8429
8430         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8431         if (skb2 == NULL)
8432                 return -ENOMEM;
8433
8434         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8435                                       info->nlh->nlmsg_seq);
8436         if (err < 0)
8437                 goto err_fill_gen_info;
8438
8439         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8440
8441 err_fill_gen_info:
8442         kfree_skb(skb2);
8443         return err;
8444 }
8445
8446 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8447         [NFT_MSG_NEWTABLE] = {
8448                 .call           = nf_tables_newtable,
8449                 .type           = NFNL_CB_BATCH,
8450                 .attr_count     = NFTA_TABLE_MAX,
8451                 .policy         = nft_table_policy,
8452         },
8453         [NFT_MSG_GETTABLE] = {
8454                 .call           = nf_tables_gettable,
8455                 .type           = NFNL_CB_RCU,
8456                 .attr_count     = NFTA_TABLE_MAX,
8457                 .policy         = nft_table_policy,
8458         },
8459         [NFT_MSG_DELTABLE] = {
8460                 .call           = nf_tables_deltable,
8461                 .type           = NFNL_CB_BATCH,
8462                 .attr_count     = NFTA_TABLE_MAX,
8463                 .policy         = nft_table_policy,
8464         },
8465         [NFT_MSG_DESTROYTABLE] = {
8466                 .call           = nf_tables_deltable,
8467                 .type           = NFNL_CB_BATCH,
8468                 .attr_count     = NFTA_TABLE_MAX,
8469                 .policy         = nft_table_policy,
8470         },
8471         [NFT_MSG_NEWCHAIN] = {
8472                 .call           = nf_tables_newchain,
8473                 .type           = NFNL_CB_BATCH,
8474                 .attr_count     = NFTA_CHAIN_MAX,
8475                 .policy         = nft_chain_policy,
8476         },
8477         [NFT_MSG_GETCHAIN] = {
8478                 .call           = nf_tables_getchain,
8479                 .type           = NFNL_CB_RCU,
8480                 .attr_count     = NFTA_CHAIN_MAX,
8481                 .policy         = nft_chain_policy,
8482         },
8483         [NFT_MSG_DELCHAIN] = {
8484                 .call           = nf_tables_delchain,
8485                 .type           = NFNL_CB_BATCH,
8486                 .attr_count     = NFTA_CHAIN_MAX,
8487                 .policy         = nft_chain_policy,
8488         },
8489         [NFT_MSG_DESTROYCHAIN] = {
8490                 .call           = nf_tables_delchain,
8491                 .type           = NFNL_CB_BATCH,
8492                 .attr_count     = NFTA_CHAIN_MAX,
8493                 .policy         = nft_chain_policy,
8494         },
8495         [NFT_MSG_NEWRULE] = {
8496                 .call           = nf_tables_newrule,
8497                 .type           = NFNL_CB_BATCH,
8498                 .attr_count     = NFTA_RULE_MAX,
8499                 .policy         = nft_rule_policy,
8500         },
8501         [NFT_MSG_GETRULE] = {
8502                 .call           = nf_tables_getrule,
8503                 .type           = NFNL_CB_RCU,
8504                 .attr_count     = NFTA_RULE_MAX,
8505                 .policy         = nft_rule_policy,
8506         },
8507         [NFT_MSG_GETRULE_RESET] = {
8508                 .call           = nf_tables_getrule,
8509                 .type           = NFNL_CB_RCU,
8510                 .attr_count     = NFTA_RULE_MAX,
8511                 .policy         = nft_rule_policy,
8512         },
8513         [NFT_MSG_DELRULE] = {
8514                 .call           = nf_tables_delrule,
8515                 .type           = NFNL_CB_BATCH,
8516                 .attr_count     = NFTA_RULE_MAX,
8517                 .policy         = nft_rule_policy,
8518         },
8519         [NFT_MSG_DESTROYRULE] = {
8520                 .call           = nf_tables_delrule,
8521                 .type           = NFNL_CB_BATCH,
8522                 .attr_count     = NFTA_RULE_MAX,
8523                 .policy         = nft_rule_policy,
8524         },
8525         [NFT_MSG_NEWSET] = {
8526                 .call           = nf_tables_newset,
8527                 .type           = NFNL_CB_BATCH,
8528                 .attr_count     = NFTA_SET_MAX,
8529                 .policy         = nft_set_policy,
8530         },
8531         [NFT_MSG_GETSET] = {
8532                 .call           = nf_tables_getset,
8533                 .type           = NFNL_CB_RCU,
8534                 .attr_count     = NFTA_SET_MAX,
8535                 .policy         = nft_set_policy,
8536         },
8537         [NFT_MSG_DELSET] = {
8538                 .call           = nf_tables_delset,
8539                 .type           = NFNL_CB_BATCH,
8540                 .attr_count     = NFTA_SET_MAX,
8541                 .policy         = nft_set_policy,
8542         },
8543         [NFT_MSG_DESTROYSET] = {
8544                 .call           = nf_tables_delset,
8545                 .type           = NFNL_CB_BATCH,
8546                 .attr_count     = NFTA_SET_MAX,
8547                 .policy         = nft_set_policy,
8548         },
8549         [NFT_MSG_NEWSETELEM] = {
8550                 .call           = nf_tables_newsetelem,
8551                 .type           = NFNL_CB_BATCH,
8552                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8553                 .policy         = nft_set_elem_list_policy,
8554         },
8555         [NFT_MSG_GETSETELEM] = {
8556                 .call           = nf_tables_getsetelem,
8557                 .type           = NFNL_CB_RCU,
8558                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8559                 .policy         = nft_set_elem_list_policy,
8560         },
8561         [NFT_MSG_DELSETELEM] = {
8562                 .call           = nf_tables_delsetelem,
8563                 .type           = NFNL_CB_BATCH,
8564                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8565                 .policy         = nft_set_elem_list_policy,
8566         },
8567         [NFT_MSG_DESTROYSETELEM] = {
8568                 .call           = nf_tables_delsetelem,
8569                 .type           = NFNL_CB_BATCH,
8570                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8571                 .policy         = nft_set_elem_list_policy,
8572         },
8573         [NFT_MSG_GETGEN] = {
8574                 .call           = nf_tables_getgen,
8575                 .type           = NFNL_CB_RCU,
8576         },
8577         [NFT_MSG_NEWOBJ] = {
8578                 .call           = nf_tables_newobj,
8579                 .type           = NFNL_CB_BATCH,
8580                 .attr_count     = NFTA_OBJ_MAX,
8581                 .policy         = nft_obj_policy,
8582         },
8583         [NFT_MSG_GETOBJ] = {
8584                 .call           = nf_tables_getobj,
8585                 .type           = NFNL_CB_RCU,
8586                 .attr_count     = NFTA_OBJ_MAX,
8587                 .policy         = nft_obj_policy,
8588         },
8589         [NFT_MSG_DELOBJ] = {
8590                 .call           = nf_tables_delobj,
8591                 .type           = NFNL_CB_BATCH,
8592                 .attr_count     = NFTA_OBJ_MAX,
8593                 .policy         = nft_obj_policy,
8594         },
8595         [NFT_MSG_DESTROYOBJ] = {
8596                 .call           = nf_tables_delobj,
8597                 .type           = NFNL_CB_BATCH,
8598                 .attr_count     = NFTA_OBJ_MAX,
8599                 .policy         = nft_obj_policy,
8600         },
8601         [NFT_MSG_GETOBJ_RESET] = {
8602                 .call           = nf_tables_getobj,
8603                 .type           = NFNL_CB_RCU,
8604                 .attr_count     = NFTA_OBJ_MAX,
8605                 .policy         = nft_obj_policy,
8606         },
8607         [NFT_MSG_NEWFLOWTABLE] = {
8608                 .call           = nf_tables_newflowtable,
8609                 .type           = NFNL_CB_BATCH,
8610                 .attr_count     = NFTA_FLOWTABLE_MAX,
8611                 .policy         = nft_flowtable_policy,
8612         },
8613         [NFT_MSG_GETFLOWTABLE] = {
8614                 .call           = nf_tables_getflowtable,
8615                 .type           = NFNL_CB_RCU,
8616                 .attr_count     = NFTA_FLOWTABLE_MAX,
8617                 .policy         = nft_flowtable_policy,
8618         },
8619         [NFT_MSG_DELFLOWTABLE] = {
8620                 .call           = nf_tables_delflowtable,
8621                 .type           = NFNL_CB_BATCH,
8622                 .attr_count     = NFTA_FLOWTABLE_MAX,
8623                 .policy         = nft_flowtable_policy,
8624         },
8625         [NFT_MSG_DESTROYFLOWTABLE] = {
8626                 .call           = nf_tables_delflowtable,
8627                 .type           = NFNL_CB_BATCH,
8628                 .attr_count     = NFTA_FLOWTABLE_MAX,
8629                 .policy         = nft_flowtable_policy,
8630         },
8631 };
8632
8633 static int nf_tables_validate(struct net *net)
8634 {
8635         struct nftables_pernet *nft_net = nft_pernet(net);
8636         struct nft_table *table;
8637
8638         switch (nft_net->validate_state) {
8639         case NFT_VALIDATE_SKIP:
8640                 break;
8641         case NFT_VALIDATE_NEED:
8642                 nft_validate_state_update(net, NFT_VALIDATE_DO);
8643                 fallthrough;
8644         case NFT_VALIDATE_DO:
8645                 list_for_each_entry(table, &nft_net->tables, list) {
8646                         if (nft_table_validate(net, table) < 0)
8647                                 return -EAGAIN;
8648                 }
8649                 break;
8650         }
8651
8652         return 0;
8653 }
8654
8655 /* a drop policy has to be deferred until all rules have been activated,
8656  * otherwise a large ruleset that contains a drop-policy base chain will
8657  * cause all packets to get dropped until the full transaction has been
8658  * processed.
8659  *
8660  * We defer the drop policy until the transaction has been finalized.
8661  */
8662 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8663 {
8664         struct nft_base_chain *basechain;
8665
8666         if (nft_trans_chain_policy(trans) != NF_DROP)
8667                 return;
8668
8669         if (!nft_is_base_chain(trans->ctx.chain))
8670                 return;
8671
8672         basechain = nft_base_chain(trans->ctx.chain);
8673         basechain->policy = NF_DROP;
8674 }
8675
8676 static void nft_chain_commit_update(struct nft_trans *trans)
8677 {
8678         struct nft_base_chain *basechain;
8679
8680         if (nft_trans_chain_name(trans)) {
8681                 rhltable_remove(&trans->ctx.table->chains_ht,
8682                                 &trans->ctx.chain->rhlhead,
8683                                 nft_chain_ht_params);
8684                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8685                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8686                                     trans->ctx.chain->name,
8687                                     &trans->ctx.chain->rhlhead,
8688                                     nft_chain_ht_params);
8689         }
8690
8691         if (!nft_is_base_chain(trans->ctx.chain))
8692                 return;
8693
8694         nft_chain_stats_replace(trans);
8695
8696         basechain = nft_base_chain(trans->ctx.chain);
8697
8698         switch (nft_trans_chain_policy(trans)) {
8699         case NF_DROP:
8700         case NF_ACCEPT:
8701                 basechain->policy = nft_trans_chain_policy(trans);
8702                 break;
8703         }
8704 }
8705
8706 static void nft_obj_commit_update(struct nft_trans *trans)
8707 {
8708         struct nft_object *newobj;
8709         struct nft_object *obj;
8710
8711         obj = nft_trans_obj(trans);
8712         newobj = nft_trans_obj_newobj(trans);
8713
8714         if (obj->ops->update)
8715                 obj->ops->update(obj, newobj);
8716
8717         nft_obj_destroy(&trans->ctx, newobj);
8718 }
8719
8720 static void nft_commit_release(struct nft_trans *trans)
8721 {
8722         switch (trans->msg_type) {
8723         case NFT_MSG_DELTABLE:
8724         case NFT_MSG_DESTROYTABLE:
8725                 nf_tables_table_destroy(&trans->ctx);
8726                 break;
8727         case NFT_MSG_NEWCHAIN:
8728                 free_percpu(nft_trans_chain_stats(trans));
8729                 kfree(nft_trans_chain_name(trans));
8730                 break;
8731         case NFT_MSG_DELCHAIN:
8732         case NFT_MSG_DESTROYCHAIN:
8733                 nf_tables_chain_destroy(&trans->ctx);
8734                 break;
8735         case NFT_MSG_DELRULE:
8736         case NFT_MSG_DESTROYRULE:
8737                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8738                 break;
8739         case NFT_MSG_DELSET:
8740         case NFT_MSG_DESTROYSET:
8741                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8742                 break;
8743         case NFT_MSG_DELSETELEM:
8744         case NFT_MSG_DESTROYSETELEM:
8745                 nf_tables_set_elem_destroy(&trans->ctx,
8746                                            nft_trans_elem_set(trans),
8747                                            nft_trans_elem(trans).priv);
8748                 break;
8749         case NFT_MSG_DELOBJ:
8750         case NFT_MSG_DESTROYOBJ:
8751                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8752                 break;
8753         case NFT_MSG_DELFLOWTABLE:
8754         case NFT_MSG_DESTROYFLOWTABLE:
8755                 if (nft_trans_flowtable_update(trans))
8756                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8757                 else
8758                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8759                 break;
8760         }
8761
8762         if (trans->put_net)
8763                 put_net(trans->ctx.net);
8764
8765         kfree(trans);
8766 }
8767
8768 static void nf_tables_trans_destroy_work(struct work_struct *w)
8769 {
8770         struct nft_trans *trans, *next;
8771         LIST_HEAD(head);
8772
8773         spin_lock(&nf_tables_destroy_list_lock);
8774         list_splice_init(&nf_tables_destroy_list, &head);
8775         spin_unlock(&nf_tables_destroy_list_lock);
8776
8777         if (list_empty(&head))
8778                 return;
8779
8780         synchronize_rcu();
8781
8782         list_for_each_entry_safe(trans, next, &head, list) {
8783                 list_del(&trans->list);
8784                 nft_commit_release(trans);
8785         }
8786 }
8787
8788 void nf_tables_trans_destroy_flush_work(void)
8789 {
8790         flush_work(&trans_destroy_work);
8791 }
8792 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8793
8794 static bool nft_expr_reduce(struct nft_regs_track *track,
8795                             const struct nft_expr *expr)
8796 {
8797         return false;
8798 }
8799
8800 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8801 {
8802         const struct nft_expr *expr, *last;
8803         struct nft_regs_track track = {};
8804         unsigned int size, data_size;
8805         void *data, *data_boundary;
8806         struct nft_rule_dp *prule;
8807         struct nft_rule *rule;
8808
8809         /* already handled or inactive chain? */
8810         if (chain->blob_next || !nft_is_active_next(net, chain))
8811                 return 0;
8812
8813         data_size = 0;
8814         list_for_each_entry(rule, &chain->rules, list) {
8815                 if (nft_is_active_next(net, rule)) {
8816                         data_size += sizeof(*prule) + rule->dlen;
8817                         if (data_size > INT_MAX)
8818                                 return -ENOMEM;
8819                 }
8820         }
8821
8822         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
8823         if (!chain->blob_next)
8824                 return -ENOMEM;
8825
8826         data = (void *)chain->blob_next->data;
8827         data_boundary = data + data_size;
8828         size = 0;
8829
8830         list_for_each_entry(rule, &chain->rules, list) {
8831                 if (!nft_is_active_next(net, rule))
8832                         continue;
8833
8834                 prule = (struct nft_rule_dp *)data;
8835                 data += offsetof(struct nft_rule_dp, data);
8836                 if (WARN_ON_ONCE(data > data_boundary))
8837                         return -ENOMEM;
8838
8839                 size = 0;
8840                 track.last = nft_expr_last(rule);
8841                 nft_rule_for_each_expr(expr, last, rule) {
8842                         track.cur = expr;
8843
8844                         if (nft_expr_reduce(&track, expr)) {
8845                                 expr = track.cur;
8846                                 continue;
8847                         }
8848
8849                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8850                                 return -ENOMEM;
8851
8852                         memcpy(data + size, expr, expr->ops->size);
8853                         size += expr->ops->size;
8854                 }
8855                 if (WARN_ON_ONCE(size >= 1 << 12))
8856                         return -ENOMEM;
8857
8858                 prule->handle = rule->handle;
8859                 prule->dlen = size;
8860                 prule->is_last = 0;
8861
8862                 data += size;
8863                 size = 0;
8864                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8865         }
8866
8867         if (WARN_ON_ONCE(data > data_boundary))
8868                 return -ENOMEM;
8869
8870         prule = (struct nft_rule_dp *)data;
8871         nft_last_rule(chain, prule);
8872
8873         return 0;
8874 }
8875
8876 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8877 {
8878         struct nftables_pernet *nft_net = nft_pernet(net);
8879         struct nft_trans *trans, *next;
8880
8881         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8882                 struct nft_chain *chain = trans->ctx.chain;
8883
8884                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8885                     trans->msg_type == NFT_MSG_DELRULE) {
8886                         kvfree(chain->blob_next);
8887                         chain->blob_next = NULL;
8888                 }
8889         }
8890 }
8891
8892 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
8893 {
8894         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
8895
8896         kvfree(l->blob);
8897 }
8898
8899 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8900 {
8901         struct nft_rule_dp_last *last;
8902
8903         /* last rule trailer is after end marker */
8904         last = (void *)blob + sizeof(*blob) + blob->size;
8905         last->blob = blob;
8906
8907         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
8908 }
8909
8910 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8911 {
8912         struct nft_rule_blob *g0, *g1;
8913         bool next_genbit;
8914
8915         next_genbit = nft_gencursor_next(net);
8916
8917         g0 = rcu_dereference_protected(chain->blob_gen_0,
8918                                        lockdep_commit_lock_is_held(net));
8919         g1 = rcu_dereference_protected(chain->blob_gen_1,
8920                                        lockdep_commit_lock_is_held(net));
8921
8922         /* No changes to this chain? */
8923         if (chain->blob_next == NULL) {
8924                 /* chain had no change in last or next generation */
8925                 if (g0 == g1)
8926                         return;
8927                 /*
8928                  * chain had no change in this generation; make sure next
8929                  * one uses same rules as current generation.
8930                  */
8931                 if (next_genbit) {
8932                         rcu_assign_pointer(chain->blob_gen_1, g0);
8933                         nf_tables_commit_chain_free_rules_old(g1);
8934                 } else {
8935                         rcu_assign_pointer(chain->blob_gen_0, g1);
8936                         nf_tables_commit_chain_free_rules_old(g0);
8937                 }
8938
8939                 return;
8940         }
8941
8942         if (next_genbit)
8943                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8944         else
8945                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8946
8947         chain->blob_next = NULL;
8948
8949         if (g0 == g1)
8950                 return;
8951
8952         if (next_genbit)
8953                 nf_tables_commit_chain_free_rules_old(g1);
8954         else
8955                 nf_tables_commit_chain_free_rules_old(g0);
8956 }
8957
8958 static void nft_obj_del(struct nft_object *obj)
8959 {
8960         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8961         list_del_rcu(&obj->list);
8962 }
8963
8964 void nft_chain_del(struct nft_chain *chain)
8965 {
8966         struct nft_table *table = chain->table;
8967
8968         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8969                                      nft_chain_ht_params));
8970         list_del_rcu(&chain->list);
8971 }
8972
8973 static void nf_tables_module_autoload_cleanup(struct net *net)
8974 {
8975         struct nftables_pernet *nft_net = nft_pernet(net);
8976         struct nft_module_request *req, *next;
8977
8978         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8979         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8980                 WARN_ON_ONCE(!req->done);
8981                 list_del(&req->list);
8982                 kfree(req);
8983         }
8984 }
8985
8986 static void nf_tables_commit_release(struct net *net)
8987 {
8988         struct nftables_pernet *nft_net = nft_pernet(net);
8989         struct nft_trans *trans;
8990
8991         /* all side effects have to be made visible.
8992          * For example, if a chain named 'foo' has been deleted, a
8993          * new transaction must not find it anymore.
8994          *
8995          * Memory reclaim happens asynchronously from work queue
8996          * to prevent expensive synchronize_rcu() in commit phase.
8997          */
8998         if (list_empty(&nft_net->commit_list)) {
8999                 nf_tables_module_autoload_cleanup(net);
9000                 mutex_unlock(&nft_net->commit_mutex);
9001                 return;
9002         }
9003
9004         trans = list_last_entry(&nft_net->commit_list,
9005                                 struct nft_trans, list);
9006         get_net(trans->ctx.net);
9007         WARN_ON_ONCE(trans->put_net);
9008
9009         trans->put_net = true;
9010         spin_lock(&nf_tables_destroy_list_lock);
9011         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9012         spin_unlock(&nf_tables_destroy_list_lock);
9013
9014         nf_tables_module_autoload_cleanup(net);
9015         schedule_work(&trans_destroy_work);
9016
9017         mutex_unlock(&nft_net->commit_mutex);
9018 }
9019
9020 static void nft_commit_notify(struct net *net, u32 portid)
9021 {
9022         struct nftables_pernet *nft_net = nft_pernet(net);
9023         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9024         unsigned char *data;
9025         int len;
9026
9027         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9028                 if (!batch_skb) {
9029 new_batch:
9030                         batch_skb = skb;
9031                         len = NLMSG_GOODSIZE - skb->len;
9032                         list_del(&skb->list);
9033                         continue;
9034                 }
9035                 len -= skb->len;
9036                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9037                         data = skb_put(batch_skb, skb->len);
9038                         memcpy(data, skb->data, skb->len);
9039                         list_del(&skb->list);
9040                         kfree_skb(skb);
9041                         continue;
9042                 }
9043                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9044                                NFT_CB(batch_skb).report, GFP_KERNEL);
9045                 goto new_batch;
9046         }
9047
9048         if (batch_skb) {
9049                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9050                                NFT_CB(batch_skb).report, GFP_KERNEL);
9051         }
9052
9053         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9054 }
9055
9056 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9057                                         struct nft_table *table)
9058 {
9059         struct nft_audit_data *adp;
9060
9061         list_for_each_entry(adp, adl, list) {
9062                 if (adp->table == table)
9063                         return 0;
9064         }
9065         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9066         if (!adp)
9067                 return -ENOMEM;
9068         adp->table = table;
9069         list_add(&adp->list, adl);
9070         return 0;
9071 }
9072
9073 static void nf_tables_commit_audit_free(struct list_head *adl)
9074 {
9075         struct nft_audit_data *adp, *adn;
9076
9077         list_for_each_entry_safe(adp, adn, adl, list) {
9078                 list_del(&adp->list);
9079                 kfree(adp);
9080         }
9081 }
9082
9083 static void nf_tables_commit_audit_collect(struct list_head *adl,
9084                                            struct nft_table *table, u32 op)
9085 {
9086         struct nft_audit_data *adp;
9087
9088         list_for_each_entry(adp, adl, list) {
9089                 if (adp->table == table)
9090                         goto found;
9091         }
9092         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9093         return;
9094 found:
9095         adp->entries++;
9096         if (!adp->op || adp->op > op)
9097                 adp->op = op;
9098 }
9099
9100 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9101
9102 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9103 {
9104         struct nft_audit_data *adp, *adn;
9105         char aubuf[AUNFTABLENAMELEN];
9106
9107         list_for_each_entry_safe(adp, adn, adl, list) {
9108                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9109                          generation);
9110                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9111                                 nft2audit_op[adp->op], GFP_KERNEL);
9112                 list_del(&adp->list);
9113                 kfree(adp);
9114         }
9115 }
9116
9117 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9118 {
9119         struct nftables_pernet *nft_net = nft_pernet(net);
9120         struct nft_trans *trans, *next;
9121         struct nft_trans_elem *te;
9122         struct nft_chain *chain;
9123         struct nft_table *table;
9124         unsigned int base_seq;
9125         LIST_HEAD(adl);
9126         int err;
9127
9128         if (list_empty(&nft_net->commit_list)) {
9129                 mutex_unlock(&nft_net->commit_mutex);
9130                 return 0;
9131         }
9132
9133         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9134         if (nf_tables_validate(net) < 0)
9135                 return -EAGAIN;
9136
9137         err = nft_flow_rule_offload_commit(net);
9138         if (err < 0)
9139                 return err;
9140
9141         /* 1.  Allocate space for next generation rules_gen_X[] */
9142         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9143                 int ret;
9144
9145                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9146                 if (ret) {
9147                         nf_tables_commit_chain_prepare_cancel(net);
9148                         nf_tables_commit_audit_free(&adl);
9149                         return ret;
9150                 }
9151                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9152                     trans->msg_type == NFT_MSG_DELRULE) {
9153                         chain = trans->ctx.chain;
9154
9155                         ret = nf_tables_commit_chain_prepare(net, chain);
9156                         if (ret < 0) {
9157                                 nf_tables_commit_chain_prepare_cancel(net);
9158                                 nf_tables_commit_audit_free(&adl);
9159                                 return ret;
9160                         }
9161                 }
9162         }
9163
9164         /* step 2.  Make rules_gen_X visible to packet path */
9165         list_for_each_entry(table, &nft_net->tables, list) {
9166                 list_for_each_entry(chain, &table->chains, list)
9167                         nf_tables_commit_chain(net, chain);
9168         }
9169
9170         /*
9171          * Bump generation counter, invalidate any dump in progress.
9172          * Cannot fail after this point.
9173          */
9174         base_seq = READ_ONCE(nft_net->base_seq);
9175         while (++base_seq == 0)
9176                 ;
9177
9178         WRITE_ONCE(nft_net->base_seq, base_seq);
9179
9180         /* step 3. Start new generation, rules_gen_X now in use. */
9181         net->nft.gencursor = nft_gencursor_next(net);
9182
9183         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9184                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9185                                                trans->msg_type);
9186                 switch (trans->msg_type) {
9187                 case NFT_MSG_NEWTABLE:
9188                         if (nft_trans_table_update(trans)) {
9189                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9190                                         nft_trans_destroy(trans);
9191                                         break;
9192                                 }
9193                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9194                                         nf_tables_table_disable(net, trans->ctx.table);
9195
9196                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9197                         } else {
9198                                 nft_clear(net, trans->ctx.table);
9199                         }
9200                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9201                         nft_trans_destroy(trans);
9202                         break;
9203                 case NFT_MSG_DELTABLE:
9204                 case NFT_MSG_DESTROYTABLE:
9205                         list_del_rcu(&trans->ctx.table->list);
9206                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
9207                         break;
9208                 case NFT_MSG_NEWCHAIN:
9209                         if (nft_trans_chain_update(trans)) {
9210                                 nft_chain_commit_update(trans);
9211                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9212                                 /* trans destroyed after rcu grace period */
9213                         } else {
9214                                 nft_chain_commit_drop_policy(trans);
9215                                 nft_clear(net, trans->ctx.chain);
9216                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9217                                 nft_trans_destroy(trans);
9218                         }
9219                         break;
9220                 case NFT_MSG_DELCHAIN:
9221                 case NFT_MSG_DESTROYCHAIN:
9222                         nft_chain_del(trans->ctx.chain);
9223                         nf_tables_chain_notify(&trans->ctx, trans->msg_type);
9224                         nf_tables_unregister_hook(trans->ctx.net,
9225                                                   trans->ctx.table,
9226                                                   trans->ctx.chain);
9227                         break;
9228                 case NFT_MSG_NEWRULE:
9229                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9230                         nf_tables_rule_notify(&trans->ctx,
9231                                               nft_trans_rule(trans),
9232                                               NFT_MSG_NEWRULE);
9233                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9234                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9235
9236                         nft_trans_destroy(trans);
9237                         break;
9238                 case NFT_MSG_DELRULE:
9239                 case NFT_MSG_DESTROYRULE:
9240                         list_del_rcu(&nft_trans_rule(trans)->list);
9241                         nf_tables_rule_notify(&trans->ctx,
9242                                               nft_trans_rule(trans),
9243                                               trans->msg_type);
9244                         nft_rule_expr_deactivate(&trans->ctx,
9245                                                  nft_trans_rule(trans),
9246                                                  NFT_TRANS_COMMIT);
9247
9248                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9249                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9250                         break;
9251                 case NFT_MSG_NEWSET:
9252                         if (nft_trans_set_update(trans)) {
9253                                 struct nft_set *set = nft_trans_set(trans);
9254
9255                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9256                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9257                         } else {
9258                                 nft_clear(net, nft_trans_set(trans));
9259                                 /* This avoids hitting -EBUSY when deleting the table
9260                                  * from the transaction.
9261                                  */
9262                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9263                                     !list_empty(&nft_trans_set(trans)->bindings))
9264                                         trans->ctx.table->use--;
9265                         }
9266                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9267                                              NFT_MSG_NEWSET, GFP_KERNEL);
9268                         nft_trans_destroy(trans);
9269                         break;
9270                 case NFT_MSG_DELSET:
9271                 case NFT_MSG_DESTROYSET:
9272                         list_del_rcu(&nft_trans_set(trans)->list);
9273                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9274                                              trans->msg_type, GFP_KERNEL);
9275                         break;
9276                 case NFT_MSG_NEWSETELEM:
9277                         te = (struct nft_trans_elem *)trans->data;
9278
9279                         nft_setelem_activate(net, te->set, &te->elem);
9280                         nf_tables_setelem_notify(&trans->ctx, te->set,
9281                                                  &te->elem,
9282                                                  NFT_MSG_NEWSETELEM);
9283                         nft_trans_destroy(trans);
9284                         break;
9285                 case NFT_MSG_DELSETELEM:
9286                 case NFT_MSG_DESTROYSETELEM:
9287                         te = (struct nft_trans_elem *)trans->data;
9288
9289                         nf_tables_setelem_notify(&trans->ctx, te->set,
9290                                                  &te->elem,
9291                                                  trans->msg_type);
9292                         nft_setelem_remove(net, te->set, &te->elem);
9293                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9294                                 atomic_dec(&te->set->nelems);
9295                                 te->set->ndeact--;
9296                         }
9297                         break;
9298                 case NFT_MSG_NEWOBJ:
9299                         if (nft_trans_obj_update(trans)) {
9300                                 nft_obj_commit_update(trans);
9301                                 nf_tables_obj_notify(&trans->ctx,
9302                                                      nft_trans_obj(trans),
9303                                                      NFT_MSG_NEWOBJ);
9304                         } else {
9305                                 nft_clear(net, nft_trans_obj(trans));
9306                                 nf_tables_obj_notify(&trans->ctx,
9307                                                      nft_trans_obj(trans),
9308                                                      NFT_MSG_NEWOBJ);
9309                                 nft_trans_destroy(trans);
9310                         }
9311                         break;
9312                 case NFT_MSG_DELOBJ:
9313                 case NFT_MSG_DESTROYOBJ:
9314                         nft_obj_del(nft_trans_obj(trans));
9315                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9316                                              trans->msg_type);
9317                         break;
9318                 case NFT_MSG_NEWFLOWTABLE:
9319                         if (nft_trans_flowtable_update(trans)) {
9320                                 nft_trans_flowtable(trans)->data.flags =
9321                                         nft_trans_flowtable_flags(trans);
9322                                 nf_tables_flowtable_notify(&trans->ctx,
9323                                                            nft_trans_flowtable(trans),
9324                                                            &nft_trans_flowtable_hooks(trans),
9325                                                            NFT_MSG_NEWFLOWTABLE);
9326                                 list_splice(&nft_trans_flowtable_hooks(trans),
9327                                             &nft_trans_flowtable(trans)->hook_list);
9328                         } else {
9329                                 nft_clear(net, nft_trans_flowtable(trans));
9330                                 nf_tables_flowtable_notify(&trans->ctx,
9331                                                            nft_trans_flowtable(trans),
9332                                                            &nft_trans_flowtable(trans)->hook_list,
9333                                                            NFT_MSG_NEWFLOWTABLE);
9334                         }
9335                         nft_trans_destroy(trans);
9336                         break;
9337                 case NFT_MSG_DELFLOWTABLE:
9338                 case NFT_MSG_DESTROYFLOWTABLE:
9339                         if (nft_trans_flowtable_update(trans)) {
9340                                 nf_tables_flowtable_notify(&trans->ctx,
9341                                                            nft_trans_flowtable(trans),
9342                                                            &nft_trans_flowtable_hooks(trans),
9343                                                            trans->msg_type);
9344                                 nft_unregister_flowtable_net_hooks(net,
9345                                                                    &nft_trans_flowtable_hooks(trans));
9346                         } else {
9347                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9348                                 nf_tables_flowtable_notify(&trans->ctx,
9349                                                            nft_trans_flowtable(trans),
9350                                                            &nft_trans_flowtable(trans)->hook_list,
9351                                                            trans->msg_type);
9352                                 nft_unregister_flowtable_net_hooks(net,
9353                                                 &nft_trans_flowtable(trans)->hook_list);
9354                         }
9355                         break;
9356                 }
9357         }
9358
9359         nft_commit_notify(net, NETLINK_CB(skb).portid);
9360         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9361         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9362         nf_tables_commit_release(net);
9363
9364         return 0;
9365 }
9366
9367 static void nf_tables_module_autoload(struct net *net)
9368 {
9369         struct nftables_pernet *nft_net = nft_pernet(net);
9370         struct nft_module_request *req, *next;
9371         LIST_HEAD(module_list);
9372
9373         list_splice_init(&nft_net->module_list, &module_list);
9374         mutex_unlock(&nft_net->commit_mutex);
9375         list_for_each_entry_safe(req, next, &module_list, list) {
9376                 request_module("%s", req->module);
9377                 req->done = true;
9378         }
9379         mutex_lock(&nft_net->commit_mutex);
9380         list_splice(&module_list, &nft_net->module_list);
9381 }
9382
9383 static void nf_tables_abort_release(struct nft_trans *trans)
9384 {
9385         switch (trans->msg_type) {
9386         case NFT_MSG_NEWTABLE:
9387                 nf_tables_table_destroy(&trans->ctx);
9388                 break;
9389         case NFT_MSG_NEWCHAIN:
9390                 nf_tables_chain_destroy(&trans->ctx);
9391                 break;
9392         case NFT_MSG_NEWRULE:
9393                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9394                 break;
9395         case NFT_MSG_NEWSET:
9396                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9397                 break;
9398         case NFT_MSG_NEWSETELEM:
9399                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9400                                      nft_trans_elem(trans).priv, true);
9401                 break;
9402         case NFT_MSG_NEWOBJ:
9403                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9404                 break;
9405         case NFT_MSG_NEWFLOWTABLE:
9406                 if (nft_trans_flowtable_update(trans))
9407                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9408                 else
9409                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9410                 break;
9411         }
9412         kfree(trans);
9413 }
9414
9415 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9416 {
9417         struct nftables_pernet *nft_net = nft_pernet(net);
9418         struct nft_trans *trans, *next;
9419         struct nft_trans_elem *te;
9420
9421         if (action == NFNL_ABORT_VALIDATE &&
9422             nf_tables_validate(net) < 0)
9423                 return -EAGAIN;
9424
9425         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9426                                          list) {
9427                 switch (trans->msg_type) {
9428                 case NFT_MSG_NEWTABLE:
9429                         if (nft_trans_table_update(trans)) {
9430                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9431                                         nft_trans_destroy(trans);
9432                                         break;
9433                                 }
9434                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9435                                         nf_tables_table_disable(net, trans->ctx.table);
9436                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9437                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9438                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9439                                 }
9440                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9441                                 nft_trans_destroy(trans);
9442                         } else {
9443                                 list_del_rcu(&trans->ctx.table->list);
9444                         }
9445                         break;
9446                 case NFT_MSG_DELTABLE:
9447                 case NFT_MSG_DESTROYTABLE:
9448                         nft_clear(trans->ctx.net, trans->ctx.table);
9449                         nft_trans_destroy(trans);
9450                         break;
9451                 case NFT_MSG_NEWCHAIN:
9452                         if (nft_trans_chain_update(trans)) {
9453                                 free_percpu(nft_trans_chain_stats(trans));
9454                                 kfree(nft_trans_chain_name(trans));
9455                                 nft_trans_destroy(trans);
9456                         } else {
9457                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9458                                         nft_trans_destroy(trans);
9459                                         break;
9460                                 }
9461                                 trans->ctx.table->use--;
9462                                 nft_chain_del(trans->ctx.chain);
9463                                 nf_tables_unregister_hook(trans->ctx.net,
9464                                                           trans->ctx.table,
9465                                                           trans->ctx.chain);
9466                         }
9467                         break;
9468                 case NFT_MSG_DELCHAIN:
9469                 case NFT_MSG_DESTROYCHAIN:
9470                         trans->ctx.table->use++;
9471                         nft_clear(trans->ctx.net, trans->ctx.chain);
9472                         nft_trans_destroy(trans);
9473                         break;
9474                 case NFT_MSG_NEWRULE:
9475                         trans->ctx.chain->use--;
9476                         list_del_rcu(&nft_trans_rule(trans)->list);
9477                         nft_rule_expr_deactivate(&trans->ctx,
9478                                                  nft_trans_rule(trans),
9479                                                  NFT_TRANS_ABORT);
9480                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9481                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9482                         break;
9483                 case NFT_MSG_DELRULE:
9484                 case NFT_MSG_DESTROYRULE:
9485                         trans->ctx.chain->use++;
9486                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9487                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9488                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9489                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9490
9491                         nft_trans_destroy(trans);
9492                         break;
9493                 case NFT_MSG_NEWSET:
9494                         if (nft_trans_set_update(trans)) {
9495                                 nft_trans_destroy(trans);
9496                                 break;
9497                         }
9498                         trans->ctx.table->use--;
9499                         if (nft_trans_set_bound(trans)) {
9500                                 nft_trans_destroy(trans);
9501                                 break;
9502                         }
9503                         list_del_rcu(&nft_trans_set(trans)->list);
9504                         break;
9505                 case NFT_MSG_DELSET:
9506                 case NFT_MSG_DESTROYSET:
9507                         trans->ctx.table->use++;
9508                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9509                         nft_trans_destroy(trans);
9510                         break;
9511                 case NFT_MSG_NEWSETELEM:
9512                         if (nft_trans_elem_set_bound(trans)) {
9513                                 nft_trans_destroy(trans);
9514                                 break;
9515                         }
9516                         te = (struct nft_trans_elem *)trans->data;
9517                         nft_setelem_remove(net, te->set, &te->elem);
9518                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9519                                 atomic_dec(&te->set->nelems);
9520                         break;
9521                 case NFT_MSG_DELSETELEM:
9522                 case NFT_MSG_DESTROYSETELEM:
9523                         te = (struct nft_trans_elem *)trans->data;
9524
9525                         nft_setelem_data_activate(net, te->set, &te->elem);
9526                         nft_setelem_activate(net, te->set, &te->elem);
9527                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9528                                 te->set->ndeact--;
9529
9530                         nft_trans_destroy(trans);
9531                         break;
9532                 case NFT_MSG_NEWOBJ:
9533                         if (nft_trans_obj_update(trans)) {
9534                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9535                                 nft_trans_destroy(trans);
9536                         } else {
9537                                 trans->ctx.table->use--;
9538                                 nft_obj_del(nft_trans_obj(trans));
9539                         }
9540                         break;
9541                 case NFT_MSG_DELOBJ:
9542                 case NFT_MSG_DESTROYOBJ:
9543                         trans->ctx.table->use++;
9544                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9545                         nft_trans_destroy(trans);
9546                         break;
9547                 case NFT_MSG_NEWFLOWTABLE:
9548                         if (nft_trans_flowtable_update(trans)) {
9549                                 nft_unregister_flowtable_net_hooks(net,
9550                                                 &nft_trans_flowtable_hooks(trans));
9551                         } else {
9552                                 trans->ctx.table->use--;
9553                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9554                                 nft_unregister_flowtable_net_hooks(net,
9555                                                 &nft_trans_flowtable(trans)->hook_list);
9556                         }
9557                         break;
9558                 case NFT_MSG_DELFLOWTABLE:
9559                 case NFT_MSG_DESTROYFLOWTABLE:
9560                         if (nft_trans_flowtable_update(trans)) {
9561                                 list_splice(&nft_trans_flowtable_hooks(trans),
9562                                             &nft_trans_flowtable(trans)->hook_list);
9563                         } else {
9564                                 trans->ctx.table->use++;
9565                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9566                         }
9567                         nft_trans_destroy(trans);
9568                         break;
9569                 }
9570         }
9571
9572         synchronize_rcu();
9573
9574         list_for_each_entry_safe_reverse(trans, next,
9575                                          &nft_net->commit_list, list) {
9576                 list_del(&trans->list);
9577                 nf_tables_abort_release(trans);
9578         }
9579
9580         if (action == NFNL_ABORT_AUTOLOAD)
9581                 nf_tables_module_autoload(net);
9582         else
9583                 nf_tables_module_autoload_cleanup(net);
9584
9585         return 0;
9586 }
9587
9588 static void nf_tables_cleanup(struct net *net)
9589 {
9590         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9591 }
9592
9593 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9594                            enum nfnl_abort_action action)
9595 {
9596         struct nftables_pernet *nft_net = nft_pernet(net);
9597         int ret = __nf_tables_abort(net, action);
9598
9599         mutex_unlock(&nft_net->commit_mutex);
9600
9601         return ret;
9602 }
9603
9604 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9605 {
9606         struct nftables_pernet *nft_net = nft_pernet(net);
9607         bool genid_ok;
9608
9609         mutex_lock(&nft_net->commit_mutex);
9610
9611         genid_ok = genid == 0 || nft_net->base_seq == genid;
9612         if (!genid_ok)
9613                 mutex_unlock(&nft_net->commit_mutex);
9614
9615         /* else, commit mutex has to be released by commit or abort function */
9616         return genid_ok;
9617 }
9618
9619 static const struct nfnetlink_subsystem nf_tables_subsys = {
9620         .name           = "nf_tables",
9621         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9622         .cb_count       = NFT_MSG_MAX,
9623         .cb             = nf_tables_cb,
9624         .commit         = nf_tables_commit,
9625         .abort          = nf_tables_abort,
9626         .cleanup        = nf_tables_cleanup,
9627         .valid_genid    = nf_tables_valid_genid,
9628         .owner          = THIS_MODULE,
9629 };
9630
9631 int nft_chain_validate_dependency(const struct nft_chain *chain,
9632                                   enum nft_chain_types type)
9633 {
9634         const struct nft_base_chain *basechain;
9635
9636         if (nft_is_base_chain(chain)) {
9637                 basechain = nft_base_chain(chain);
9638                 if (basechain->type->type != type)
9639                         return -EOPNOTSUPP;
9640         }
9641         return 0;
9642 }
9643 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9644
9645 int nft_chain_validate_hooks(const struct nft_chain *chain,
9646                              unsigned int hook_flags)
9647 {
9648         struct nft_base_chain *basechain;
9649
9650         if (nft_is_base_chain(chain)) {
9651                 basechain = nft_base_chain(chain);
9652
9653                 if ((1 << basechain->ops.hooknum) & hook_flags)
9654                         return 0;
9655
9656                 return -EOPNOTSUPP;
9657         }
9658
9659         return 0;
9660 }
9661 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9662
9663 /*
9664  * Loop detection - walk through the ruleset beginning at the destination chain
9665  * of a new jump until either the source chain is reached (loop) or all
9666  * reachable chains have been traversed.
9667  *
9668  * The loop check is performed whenever a new jump verdict is added to an
9669  * expression or verdict map or a verdict map is bound to a new chain.
9670  */
9671
9672 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9673                                  const struct nft_chain *chain);
9674
9675 static int nft_check_loops(const struct nft_ctx *ctx,
9676                            const struct nft_set_ext *ext)
9677 {
9678         const struct nft_data *data;
9679         int ret;
9680
9681         data = nft_set_ext_data(ext);
9682         switch (data->verdict.code) {
9683         case NFT_JUMP:
9684         case NFT_GOTO:
9685                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9686                 break;
9687         default:
9688                 ret = 0;
9689                 break;
9690         }
9691
9692         return ret;
9693 }
9694
9695 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9696                                         struct nft_set *set,
9697                                         const struct nft_set_iter *iter,
9698                                         struct nft_set_elem *elem)
9699 {
9700         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9701
9702         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9703             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9704                 return 0;
9705
9706         return nft_check_loops(ctx, ext);
9707 }
9708
9709 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9710                                   struct nft_set *set)
9711 {
9712         u8 genmask = nft_genmask_next(ctx->net);
9713         struct nft_set_elem_catchall *catchall;
9714         struct nft_set_ext *ext;
9715         int ret = 0;
9716
9717         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9718                 ext = nft_set_elem_ext(set, catchall->elem);
9719                 if (!nft_set_elem_active(ext, genmask))
9720                         continue;
9721
9722                 ret = nft_check_loops(ctx, ext);
9723                 if (ret < 0)
9724                         return ret;
9725         }
9726
9727         return ret;
9728 }
9729
9730 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9731                                  const struct nft_chain *chain)
9732 {
9733         const struct nft_rule *rule;
9734         const struct nft_expr *expr, *last;
9735         struct nft_set *set;
9736         struct nft_set_binding *binding;
9737         struct nft_set_iter iter;
9738
9739         if (ctx->chain == chain)
9740                 return -ELOOP;
9741
9742         list_for_each_entry(rule, &chain->rules, list) {
9743                 nft_rule_for_each_expr(expr, last, rule) {
9744                         struct nft_immediate_expr *priv;
9745                         const struct nft_data *data;
9746                         int err;
9747
9748                         if (strcmp(expr->ops->type->name, "immediate"))
9749                                 continue;
9750
9751                         priv = nft_expr_priv(expr);
9752                         if (priv->dreg != NFT_REG_VERDICT)
9753                                 continue;
9754
9755                         data = &priv->data;
9756                         switch (data->verdict.code) {
9757                         case NFT_JUMP:
9758                         case NFT_GOTO:
9759                                 err = nf_tables_check_loops(ctx,
9760                                                         data->verdict.chain);
9761                                 if (err < 0)
9762                                         return err;
9763                                 break;
9764                         default:
9765                                 break;
9766                         }
9767                 }
9768         }
9769
9770         list_for_each_entry(set, &ctx->table->sets, list) {
9771                 if (!nft_is_active_next(ctx->net, set))
9772                         continue;
9773                 if (!(set->flags & NFT_SET_MAP) ||
9774                     set->dtype != NFT_DATA_VERDICT)
9775                         continue;
9776
9777                 list_for_each_entry(binding, &set->bindings, list) {
9778                         if (!(binding->flags & NFT_SET_MAP) ||
9779                             binding->chain != chain)
9780                                 continue;
9781
9782                         iter.genmask    = nft_genmask_next(ctx->net);
9783                         iter.skip       = 0;
9784                         iter.count      = 0;
9785                         iter.err        = 0;
9786                         iter.fn         = nf_tables_loop_check_setelem;
9787
9788                         set->ops->walk(ctx, set, &iter);
9789                         if (!iter.err)
9790                                 iter.err = nft_set_catchall_loops(ctx, set);
9791
9792                         if (iter.err < 0)
9793                                 return iter.err;
9794                 }
9795         }
9796
9797         return 0;
9798 }
9799
9800 /**
9801  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9802  *
9803  *      @attr: netlink attribute to fetch value from
9804  *      @max: maximum value to be stored in dest
9805  *      @dest: pointer to the variable
9806  *
9807  *      Parse, check and store a given u32 netlink attribute into variable.
9808  *      This function returns -ERANGE if the value goes over maximum value.
9809  *      Otherwise a 0 is returned and the attribute value is stored in the
9810  *      destination variable.
9811  */
9812 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9813 {
9814         u32 val;
9815
9816         val = ntohl(nla_get_be32(attr));
9817         if (val > max)
9818                 return -ERANGE;
9819
9820         *dest = val;
9821         return 0;
9822 }
9823 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9824
9825 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9826 {
9827         unsigned int reg;
9828
9829         reg = ntohl(nla_get_be32(attr));
9830         switch (reg) {
9831         case NFT_REG_VERDICT...NFT_REG_4:
9832                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9833                 break;
9834         case NFT_REG32_00...NFT_REG32_15:
9835                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9836                 break;
9837         default:
9838                 return -ERANGE;
9839         }
9840
9841         return 0;
9842 }
9843
9844 /**
9845  *      nft_dump_register - dump a register value to a netlink attribute
9846  *
9847  *      @skb: socket buffer
9848  *      @attr: attribute number
9849  *      @reg: register number
9850  *
9851  *      Construct a netlink attribute containing the register number. For
9852  *      compatibility reasons, register numbers being a multiple of 4 are
9853  *      translated to the corresponding 128 bit register numbers.
9854  */
9855 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9856 {
9857         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9858                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9859         else
9860                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9861
9862         return nla_put_be32(skb, attr, htonl(reg));
9863 }
9864 EXPORT_SYMBOL_GPL(nft_dump_register);
9865
9866 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9867 {
9868         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9869                 return -EINVAL;
9870         if (len == 0)
9871                 return -EINVAL;
9872         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9873                 return -ERANGE;
9874
9875         return 0;
9876 }
9877
9878 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9879 {
9880         u32 reg;
9881         int err;
9882
9883         err = nft_parse_register(attr, &reg);
9884         if (err < 0)
9885                 return err;
9886
9887         err = nft_validate_register_load(reg, len);
9888         if (err < 0)
9889                 return err;
9890
9891         *sreg = reg;
9892         return 0;
9893 }
9894 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9895
9896 static int nft_validate_register_store(const struct nft_ctx *ctx,
9897                                        enum nft_registers reg,
9898                                        const struct nft_data *data,
9899                                        enum nft_data_types type,
9900                                        unsigned int len)
9901 {
9902         int err;
9903
9904         switch (reg) {
9905         case NFT_REG_VERDICT:
9906                 if (type != NFT_DATA_VERDICT)
9907                         return -EINVAL;
9908
9909                 if (data != NULL &&
9910                     (data->verdict.code == NFT_GOTO ||
9911                      data->verdict.code == NFT_JUMP)) {
9912                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9913                         if (err < 0)
9914                                 return err;
9915                 }
9916
9917                 return 0;
9918         default:
9919                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9920                         return -EINVAL;
9921                 if (len == 0)
9922                         return -EINVAL;
9923                 if (reg * NFT_REG32_SIZE + len >
9924                     sizeof_field(struct nft_regs, data))
9925                         return -ERANGE;
9926
9927                 if (data != NULL && type != NFT_DATA_VALUE)
9928                         return -EINVAL;
9929                 return 0;
9930         }
9931 }
9932
9933 int nft_parse_register_store(const struct nft_ctx *ctx,
9934                              const struct nlattr *attr, u8 *dreg,
9935                              const struct nft_data *data,
9936                              enum nft_data_types type, unsigned int len)
9937 {
9938         int err;
9939         u32 reg;
9940
9941         err = nft_parse_register(attr, &reg);
9942         if (err < 0)
9943                 return err;
9944
9945         err = nft_validate_register_store(ctx, reg, data, type, len);
9946         if (err < 0)
9947                 return err;
9948
9949         *dreg = reg;
9950         return 0;
9951 }
9952 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9953
9954 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9955         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9956         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9957                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9958         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9959 };
9960
9961 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9962                             struct nft_data_desc *desc, const struct nlattr *nla)
9963 {
9964         u8 genmask = nft_genmask_next(ctx->net);
9965         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9966         struct nft_chain *chain;
9967         int err;
9968
9969         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9970                                           nft_verdict_policy, NULL);
9971         if (err < 0)
9972                 return err;
9973
9974         if (!tb[NFTA_VERDICT_CODE])
9975                 return -EINVAL;
9976         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9977
9978         switch (data->verdict.code) {
9979         default:
9980                 switch (data->verdict.code & NF_VERDICT_MASK) {
9981                 case NF_ACCEPT:
9982                 case NF_DROP:
9983                 case NF_QUEUE:
9984                         break;
9985                 default:
9986                         return -EINVAL;
9987                 }
9988                 fallthrough;
9989         case NFT_CONTINUE:
9990         case NFT_BREAK:
9991         case NFT_RETURN:
9992                 break;
9993         case NFT_JUMP:
9994         case NFT_GOTO:
9995                 if (tb[NFTA_VERDICT_CHAIN]) {
9996                         chain = nft_chain_lookup(ctx->net, ctx->table,
9997                                                  tb[NFTA_VERDICT_CHAIN],
9998                                                  genmask);
9999                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10000                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10001                                                       tb[NFTA_VERDICT_CHAIN_ID]);
10002                         if (IS_ERR(chain))
10003                                 return PTR_ERR(chain);
10004                 } else {
10005                         return -EINVAL;
10006                 }
10007
10008                 if (IS_ERR(chain))
10009                         return PTR_ERR(chain);
10010                 if (nft_is_base_chain(chain))
10011                         return -EOPNOTSUPP;
10012                 if (nft_chain_is_bound(chain))
10013                         return -EINVAL;
10014                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10015                     chain->flags & NFT_CHAIN_BINDING)
10016                         return -EINVAL;
10017
10018                 chain->use++;
10019                 data->verdict.chain = chain;
10020                 break;
10021         }
10022
10023         desc->len = sizeof(data->verdict);
10024
10025         return 0;
10026 }
10027
10028 static void nft_verdict_uninit(const struct nft_data *data)
10029 {
10030         struct nft_chain *chain;
10031         struct nft_rule *rule;
10032
10033         switch (data->verdict.code) {
10034         case NFT_JUMP:
10035         case NFT_GOTO:
10036                 chain = data->verdict.chain;
10037                 chain->use--;
10038
10039                 if (!nft_chain_is_bound(chain))
10040                         break;
10041
10042                 chain->table->use--;
10043                 list_for_each_entry(rule, &chain->rules, list)
10044                         chain->use--;
10045
10046                 nft_chain_del(chain);
10047                 break;
10048         }
10049 }
10050
10051 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10052 {
10053         struct nlattr *nest;
10054
10055         nest = nla_nest_start_noflag(skb, type);
10056         if (!nest)
10057                 goto nla_put_failure;
10058
10059         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10060                 goto nla_put_failure;
10061
10062         switch (v->code) {
10063         case NFT_JUMP:
10064         case NFT_GOTO:
10065                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10066                                    v->chain->name))
10067                         goto nla_put_failure;
10068         }
10069         nla_nest_end(skb, nest);
10070         return 0;
10071
10072 nla_put_failure:
10073         return -1;
10074 }
10075
10076 static int nft_value_init(const struct nft_ctx *ctx,
10077                           struct nft_data *data, struct nft_data_desc *desc,
10078                           const struct nlattr *nla)
10079 {
10080         unsigned int len;
10081
10082         len = nla_len(nla);
10083         if (len == 0)
10084                 return -EINVAL;
10085         if (len > desc->size)
10086                 return -EOVERFLOW;
10087         if (desc->len) {
10088                 if (len != desc->len)
10089                         return -EINVAL;
10090         } else {
10091                 desc->len = len;
10092         }
10093
10094         nla_memcpy(data->data, nla, len);
10095
10096         return 0;
10097 }
10098
10099 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10100                           unsigned int len)
10101 {
10102         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10103 }
10104
10105 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10106         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10107         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10108 };
10109
10110 /**
10111  *      nft_data_init - parse nf_tables data netlink attributes
10112  *
10113  *      @ctx: context of the expression using the data
10114  *      @data: destination struct nft_data
10115  *      @desc: data description
10116  *      @nla: netlink attribute containing data
10117  *
10118  *      Parse the netlink data attributes and initialize a struct nft_data.
10119  *      The type and length of data are returned in the data description.
10120  *
10121  *      The caller can indicate that it only wants to accept data of type
10122  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10123  */
10124 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10125                   struct nft_data_desc *desc, const struct nlattr *nla)
10126 {
10127         struct nlattr *tb[NFTA_DATA_MAX + 1];
10128         int err;
10129
10130         if (WARN_ON_ONCE(!desc->size))
10131                 return -EINVAL;
10132
10133         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10134                                           nft_data_policy, NULL);
10135         if (err < 0)
10136                 return err;
10137
10138         if (tb[NFTA_DATA_VALUE]) {
10139                 if (desc->type != NFT_DATA_VALUE)
10140                         return -EINVAL;
10141
10142                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10143         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10144                 if (desc->type != NFT_DATA_VERDICT)
10145                         return -EINVAL;
10146
10147                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10148         } else {
10149                 err = -EINVAL;
10150         }
10151
10152         return err;
10153 }
10154 EXPORT_SYMBOL_GPL(nft_data_init);
10155
10156 /**
10157  *      nft_data_release - release a nft_data item
10158  *
10159  *      @data: struct nft_data to release
10160  *      @type: type of data
10161  *
10162  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10163  *      all others need to be released by calling this function.
10164  */
10165 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10166 {
10167         if (type < NFT_DATA_VERDICT)
10168                 return;
10169         switch (type) {
10170         case NFT_DATA_VERDICT:
10171                 return nft_verdict_uninit(data);
10172         default:
10173                 WARN_ON(1);
10174         }
10175 }
10176 EXPORT_SYMBOL_GPL(nft_data_release);
10177
10178 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10179                   enum nft_data_types type, unsigned int len)
10180 {
10181         struct nlattr *nest;
10182         int err;
10183
10184         nest = nla_nest_start_noflag(skb, attr);
10185         if (nest == NULL)
10186                 return -1;
10187
10188         switch (type) {
10189         case NFT_DATA_VALUE:
10190                 err = nft_value_dump(skb, data, len);
10191                 break;
10192         case NFT_DATA_VERDICT:
10193                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10194                 break;
10195         default:
10196                 err = -EINVAL;
10197                 WARN_ON(1);
10198         }
10199
10200         nla_nest_end(skb, nest);
10201         return err;
10202 }
10203 EXPORT_SYMBOL_GPL(nft_data_dump);
10204
10205 int __nft_release_basechain(struct nft_ctx *ctx)
10206 {
10207         struct nft_rule *rule, *nr;
10208
10209         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10210                 return 0;
10211
10212         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10213         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10214                 list_del(&rule->list);
10215                 ctx->chain->use--;
10216                 nf_tables_rule_release(ctx, rule);
10217         }
10218         nft_chain_del(ctx->chain);
10219         ctx->table->use--;
10220         nf_tables_chain_destroy(ctx);
10221
10222         return 0;
10223 }
10224 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10225
10226 static void __nft_release_hook(struct net *net, struct nft_table *table)
10227 {
10228         struct nft_flowtable *flowtable;
10229         struct nft_chain *chain;
10230
10231         list_for_each_entry(chain, &table->chains, list)
10232                 __nf_tables_unregister_hook(net, table, chain, true);
10233         list_for_each_entry(flowtable, &table->flowtables, list)
10234                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10235                                                      true);
10236 }
10237
10238 static void __nft_release_hooks(struct net *net)
10239 {
10240         struct nftables_pernet *nft_net = nft_pernet(net);
10241         struct nft_table *table;
10242
10243         list_for_each_entry(table, &nft_net->tables, list) {
10244                 if (nft_table_has_owner(table))
10245                         continue;
10246
10247                 __nft_release_hook(net, table);
10248         }
10249 }
10250
10251 static void __nft_release_table(struct net *net, struct nft_table *table)
10252 {
10253         struct nft_flowtable *flowtable, *nf;
10254         struct nft_chain *chain, *nc;
10255         struct nft_object *obj, *ne;
10256         struct nft_rule *rule, *nr;
10257         struct nft_set *set, *ns;
10258         struct nft_ctx ctx = {
10259                 .net    = net,
10260                 .family = NFPROTO_NETDEV,
10261         };
10262
10263         ctx.family = table->family;
10264         ctx.table = table;
10265         list_for_each_entry(chain, &table->chains, list) {
10266                 ctx.chain = chain;
10267                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10268                         list_del(&rule->list);
10269                         chain->use--;
10270                         nf_tables_rule_release(&ctx, rule);
10271                 }
10272         }
10273         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10274                 list_del(&flowtable->list);
10275                 table->use--;
10276                 nf_tables_flowtable_destroy(flowtable);
10277         }
10278         list_for_each_entry_safe(set, ns, &table->sets, list) {
10279                 list_del(&set->list);
10280                 table->use--;
10281                 nft_set_destroy(&ctx, set);
10282         }
10283         list_for_each_entry_safe(obj, ne, &table->objects, list) {
10284                 nft_obj_del(obj);
10285                 table->use--;
10286                 nft_obj_destroy(&ctx, obj);
10287         }
10288         list_for_each_entry_safe(chain, nc, &table->chains, list) {
10289                 ctx.chain = chain;
10290                 nft_chain_del(chain);
10291                 table->use--;
10292                 nf_tables_chain_destroy(&ctx);
10293         }
10294         nf_tables_table_destroy(&ctx);
10295 }
10296
10297 static void __nft_release_tables(struct net *net)
10298 {
10299         struct nftables_pernet *nft_net = nft_pernet(net);
10300         struct nft_table *table, *nt;
10301
10302         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10303                 if (nft_table_has_owner(table))
10304                         continue;
10305
10306                 list_del(&table->list);
10307
10308                 __nft_release_table(net, table);
10309         }
10310 }
10311
10312 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10313                             void *ptr)
10314 {
10315         struct nft_table *table, *to_delete[8];
10316         struct nftables_pernet *nft_net;
10317         struct netlink_notify *n = ptr;
10318         struct net *net = n->net;
10319         unsigned int deleted;
10320         bool restart = false;
10321
10322         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10323                 return NOTIFY_DONE;
10324
10325         nft_net = nft_pernet(net);
10326         deleted = 0;
10327         mutex_lock(&nft_net->commit_mutex);
10328         if (!list_empty(&nf_tables_destroy_list))
10329                 rcu_barrier();
10330 again:
10331         list_for_each_entry(table, &nft_net->tables, list) {
10332                 if (nft_table_has_owner(table) &&
10333                     n->portid == table->nlpid) {
10334                         __nft_release_hook(net, table);
10335                         list_del_rcu(&table->list);
10336                         to_delete[deleted++] = table;
10337                         if (deleted >= ARRAY_SIZE(to_delete))
10338                                 break;
10339                 }
10340         }
10341         if (deleted) {
10342                 restart = deleted >= ARRAY_SIZE(to_delete);
10343                 synchronize_rcu();
10344                 while (deleted)
10345                         __nft_release_table(net, to_delete[--deleted]);
10346
10347                 if (restart)
10348                         goto again;
10349         }
10350         mutex_unlock(&nft_net->commit_mutex);
10351
10352         return NOTIFY_DONE;
10353 }
10354
10355 static struct notifier_block nft_nl_notifier = {
10356         .notifier_call  = nft_rcv_nl_event,
10357 };
10358
10359 static int __net_init nf_tables_init_net(struct net *net)
10360 {
10361         struct nftables_pernet *nft_net = nft_pernet(net);
10362
10363         INIT_LIST_HEAD(&nft_net->tables);
10364         INIT_LIST_HEAD(&nft_net->commit_list);
10365         INIT_LIST_HEAD(&nft_net->module_list);
10366         INIT_LIST_HEAD(&nft_net->notify_list);
10367         mutex_init(&nft_net->commit_mutex);
10368         nft_net->base_seq = 1;
10369         nft_net->validate_state = NFT_VALIDATE_SKIP;
10370
10371         return 0;
10372 }
10373
10374 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10375 {
10376         struct nftables_pernet *nft_net = nft_pernet(net);
10377
10378         mutex_lock(&nft_net->commit_mutex);
10379         __nft_release_hooks(net);
10380         mutex_unlock(&nft_net->commit_mutex);
10381 }
10382
10383 static void __net_exit nf_tables_exit_net(struct net *net)
10384 {
10385         struct nftables_pernet *nft_net = nft_pernet(net);
10386
10387         mutex_lock(&nft_net->commit_mutex);
10388         if (!list_empty(&nft_net->commit_list) ||
10389             !list_empty(&nft_net->module_list))
10390                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10391         __nft_release_tables(net);
10392         mutex_unlock(&nft_net->commit_mutex);
10393         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10394         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10395         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10396 }
10397
10398 static struct pernet_operations nf_tables_net_ops = {
10399         .init           = nf_tables_init_net,
10400         .pre_exit       = nf_tables_pre_exit_net,
10401         .exit           = nf_tables_exit_net,
10402         .id             = &nf_tables_net_id,
10403         .size           = sizeof(struct nftables_pernet),
10404 };
10405
10406 static int __init nf_tables_module_init(void)
10407 {
10408         int err;
10409
10410         err = register_pernet_subsys(&nf_tables_net_ops);
10411         if (err < 0)
10412                 return err;
10413
10414         err = nft_chain_filter_init();
10415         if (err < 0)
10416                 goto err_chain_filter;
10417
10418         err = nf_tables_core_module_init();
10419         if (err < 0)
10420                 goto err_core_module;
10421
10422         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10423         if (err < 0)
10424                 goto err_netdev_notifier;
10425
10426         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10427         if (err < 0)
10428                 goto err_rht_objname;
10429
10430         err = nft_offload_init();
10431         if (err < 0)
10432                 goto err_offload;
10433
10434         err = netlink_register_notifier(&nft_nl_notifier);
10435         if (err < 0)
10436                 goto err_netlink_notifier;
10437
10438         /* must be last */
10439         err = nfnetlink_subsys_register(&nf_tables_subsys);
10440         if (err < 0)
10441                 goto err_nfnl_subsys;
10442
10443         nft_chain_route_init();
10444
10445         return err;
10446
10447 err_nfnl_subsys:
10448         netlink_unregister_notifier(&nft_nl_notifier);
10449 err_netlink_notifier:
10450         nft_offload_exit();
10451 err_offload:
10452         rhltable_destroy(&nft_objname_ht);
10453 err_rht_objname:
10454         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10455 err_netdev_notifier:
10456         nf_tables_core_module_exit();
10457 err_core_module:
10458         nft_chain_filter_fini();
10459 err_chain_filter:
10460         unregister_pernet_subsys(&nf_tables_net_ops);
10461         return err;
10462 }
10463
10464 static void __exit nf_tables_module_exit(void)
10465 {
10466         nfnetlink_subsys_unregister(&nf_tables_subsys);
10467         netlink_unregister_notifier(&nft_nl_notifier);
10468         nft_offload_exit();
10469         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10470         nft_chain_filter_fini();
10471         nft_chain_route_fini();
10472         unregister_pernet_subsys(&nf_tables_net_ops);
10473         cancel_work_sync(&trans_destroy_work);
10474         rcu_barrier();
10475         rhltable_destroy(&nft_objname_ht);
10476         nf_tables_core_module_exit();
10477 }
10478
10479 module_init(nf_tables_module_init);
10480 module_exit(nf_tables_module_exit);
10481
10482 MODULE_LICENSE("GPL");
10483 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10484 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);