net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35
  36 enum {
  37         NFT_VALIDATE_SKIP       = 0,
  38         NFT_VALIDATE_NEED,
  39         NFT_VALIDATE_DO,
  40 };
  41
  42 static struct rhltable nft_objname_ht;
  43
  44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  47
  48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  51
  52 static const struct rhashtable_params nft_chain_ht_params = {
  53         .head_offset            = offsetof(struct nft_chain, rhlhead),
  54         .key_offset             = offsetof(struct nft_chain, name),
  55         .hashfn                 = nft_chain_hash,
  56         .obj_hashfn             = nft_chain_hash_obj,
  57         .obj_cmpfn              = nft_chain_hash_cmp,
  58         .automatic_shrinking    = true,
  59 };
  60
  61 static const struct rhashtable_params nft_objname_ht_params = {
  62         .head_offset            = offsetof(struct nft_object, rhlhead),
  63         .key_offset             = offsetof(struct nft_object, key),
  64         .hashfn                 = nft_objname_hash,
  65         .obj_hashfn             = nft_objname_hash_obj,
  66         .obj_cmpfn              = nft_objname_hash_cmp,
  67         .automatic_shrinking    = true,
  68 };
  69
  70 struct nft_audit_data {
  71         struct nft_table *table;
  72         int entries;
  73         int op;
  74         struct list_head list;
  75 };
  76
  77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  78         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  79         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  80         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  81         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  82         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  84         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  85         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  87         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  88         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  90         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  91         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  93         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  94         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  97         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
  99         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 100         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 101         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 102         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 103 };
 104
 105 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 106 {
 107         switch (table->validate_state) {
 108         case NFT_VALIDATE_SKIP:
 109                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 110                 break;
 111         case NFT_VALIDATE_NEED:
 112                 break;
 113         case NFT_VALIDATE_DO:
 114                 if (new_validate_state == NFT_VALIDATE_NEED)
 115                         return;
 116         }
 117
 118         table->validate_state = new_validate_state;
 119 }
 120 static void nf_tables_trans_destroy_work(struct work_struct *w);
 121 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 122
 123 static void nft_ctx_init(struct nft_ctx *ctx,
 124                          struct net *net,
 125                          const struct sk_buff *skb,
 126                          const struct nlmsghdr *nlh,
 127                          u8 family,
 128                          struct nft_table *table,
 129                          struct nft_chain *chain,
 130                          const struct nlattr * const *nla)
 131 {
 132         ctx->net        = net;
 133         ctx->family     = family;
 134         ctx->level      = 0;
 135         ctx->table      = table;
 136         ctx->chain      = chain;
 137         ctx->nla        = nla;
 138         ctx->portid     = NETLINK_CB(skb).portid;
 139         ctx->report     = nlmsg_report(nlh);
 140         ctx->flags      = nlh->nlmsg_flags;
 141         ctx->seq        = nlh->nlmsg_seq;
 142 }
 143
 144 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 145                                              int msg_type, u32 size, gfp_t gfp)
 146 {
 147         struct nft_trans *trans;
 148
 149         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 150         if (trans == NULL)
 151                 return NULL;
 152
 153         INIT_LIST_HEAD(&trans->list);
 154         trans->msg_type = msg_type;
 155         trans->ctx      = *ctx;
 156
 157         return trans;
 158 }
 159
 160 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 161                                          int msg_type, u32 size)
 162 {
 163         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 164 }
 165
 166 static void nft_trans_destroy(struct nft_trans *trans)
 167 {
 168         list_del(&trans->list);
 169         kfree(trans);
 170 }
 171
 172 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 173 {
 174         struct nftables_pernet *nft_net;
 175         struct net *net = ctx->net;
 176         struct nft_trans *trans;
 177
 178         if (!nft_set_is_anonymous(set))
 179                 return;
 180
 181         nft_net = nft_pernet(net);
 182         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 183                 switch (trans->msg_type) {
 184                 case NFT_MSG_NEWSET:
 185                         if (nft_trans_set(trans) == set)
 186                                 nft_trans_set_bound(trans) = true;
 187                         break;
 188                 case NFT_MSG_NEWSETELEM:
 189                         if (nft_trans_elem_set(trans) == set)
 190                                 nft_trans_elem_set_bound(trans) = true;
 191                         break;
 192                 }
 193         }
 194 }
 195
 196 static int nft_netdev_register_hooks(struct net *net,
 197                                      struct list_head *hook_list)
 198 {
 199         struct nft_hook *hook;
 200         int err, j;
 201
 202         j = 0;
 203         list_for_each_entry(hook, hook_list, list) {
 204                 err = nf_register_net_hook(net, &hook->ops);
 205                 if (err < 0)
 206                         goto err_register;
 207
 208                 j++;
 209         }
 210         return 0;
 211
 212 err_register:
 213         list_for_each_entry(hook, hook_list, list) {
 214                 if (j-- <= 0)
 215                         break;
 216
 217                 nf_unregister_net_hook(net, &hook->ops);
 218         }
 219         return err;
 220 }
 221
 222 static void nft_netdev_unregister_hooks(struct net *net,
 223                                         struct list_head *hook_list,
 224                                         bool release_netdev)
 225 {
 226         struct nft_hook *hook, *next;
 227
 228         list_for_each_entry_safe(hook, next, hook_list, list) {
 229                 nf_unregister_net_hook(net, &hook->ops);
 230                 if (release_netdev) {
 231                         list_del(&hook->list);
 232                         kfree_rcu(hook, rcu);
 233                 }
 234         }
 235 }
 236
 237 static int nf_tables_register_hook(struct net *net,
 238                                    const struct nft_table *table,
 239                                    struct nft_chain *chain)
 240 {
 241         struct nft_base_chain *basechain;
 242         const struct nf_hook_ops *ops;
 243
 244         if (table->flags & NFT_TABLE_F_DORMANT ||
 245             !nft_is_base_chain(chain))
 246                 return 0;
 247
 248         basechain = nft_base_chain(chain);
 249         ops = &basechain->ops;
 250
 251         if (basechain->type->ops_register)
 252                 return basechain->type->ops_register(net, ops);
 253
 254         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 255                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 256
 257         return nf_register_net_hook(net, &basechain->ops);
 258 }
 259
 260 static void __nf_tables_unregister_hook(struct net *net,
 261                                         const struct nft_table *table,
 262                                         struct nft_chain *chain,
 263                                         bool release_netdev)
 264 {
 265         struct nft_base_chain *basechain;
 266         const struct nf_hook_ops *ops;
 267
 268         if (table->flags & NFT_TABLE_F_DORMANT ||
 269             !nft_is_base_chain(chain))
 270                 return;
 271         basechain = nft_base_chain(chain);
 272         ops = &basechain->ops;
 273
 274         if (basechain->type->ops_unregister)
 275                 return basechain->type->ops_unregister(net, ops);
 276
 277         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 278                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 279                                             release_netdev);
 280         else
 281                 nf_unregister_net_hook(net, &basechain->ops);
 282 }
 283
 284 static void nf_tables_unregister_hook(struct net *net,
 285                                       const struct nft_table *table,
 286                                       struct nft_chain *chain)
 287 {
 288         return __nf_tables_unregister_hook(net, table, chain, false);
 289 }
 290
 291 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 292 {
 293         struct nftables_pernet *nft_net = nft_pernet(net);
 294
 295         list_add_tail(&trans->list, &nft_net->commit_list);
 296 }
 297
 298 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 299 {
 300         struct nft_trans *trans;
 301
 302         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 303         if (trans == NULL)
 304                 return -ENOMEM;
 305
 306         if (msg_type == NFT_MSG_NEWTABLE)
 307                 nft_activate_next(ctx->net, ctx->table);
 308
 309         nft_trans_commit_list_add_tail(ctx->net, trans);
 310         return 0;
 311 }
 312
 313 static int nft_deltable(struct nft_ctx *ctx)
 314 {
 315         int err;
 316
 317         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 318         if (err < 0)
 319                 return err;
 320
 321         nft_deactivate_next(ctx->net, ctx->table);
 322         return err;
 323 }
 324
 325 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 326 {
 327         struct nft_trans *trans;
 328
 329         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 330         if (trans == NULL)
 331                 return ERR_PTR(-ENOMEM);
 332
 333         if (msg_type == NFT_MSG_NEWCHAIN) {
 334                 nft_activate_next(ctx->net, ctx->chain);
 335
 336                 if (ctx->nla[NFTA_CHAIN_ID]) {
 337                         nft_trans_chain_id(trans) =
 338                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 339                 }
 340         }
 341
 342         nft_trans_commit_list_add_tail(ctx->net, trans);
 343         return trans;
 344 }
 345
 346 static int nft_delchain(struct nft_ctx *ctx)
 347 {
 348         struct nft_trans *trans;
 349
 350         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 351         if (IS_ERR(trans))
 352                 return PTR_ERR(trans);
 353
 354         ctx->table->use--;
 355         nft_deactivate_next(ctx->net, ctx->chain);
 356
 357         return 0;
 358 }
 359
 360 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 361                                    struct nft_rule *rule)
 362 {
 363         struct nft_expr *expr;
 364
 365         expr = nft_expr_first(rule);
 366         while (nft_expr_more(rule, expr)) {
 367                 if (expr->ops->activate)
 368                         expr->ops->activate(ctx, expr);
 369
 370                 expr = nft_expr_next(expr);
 371         }
 372 }
 373
 374 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 375                                      struct nft_rule *rule,
 376                                      enum nft_trans_phase phase)
 377 {
 378         struct nft_expr *expr;
 379
 380         expr = nft_expr_first(rule);
 381         while (nft_expr_more(rule, expr)) {
 382                 if (expr->ops->deactivate)
 383                         expr->ops->deactivate(ctx, expr, phase);
 384
 385                 expr = nft_expr_next(expr);
 386         }
 387 }
 388
 389 static int
 390 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 391 {
 392         /* You cannot delete the same rule twice */
 393         if (nft_is_active_next(ctx->net, rule)) {
 394                 nft_deactivate_next(ctx->net, rule);
 395                 ctx->chain->use--;
 396                 return 0;
 397         }
 398         return -ENOENT;
 399 }
 400
 401 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 402                                             struct nft_rule *rule)
 403 {
 404         struct nft_trans *trans;
 405
 406         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 407         if (trans == NULL)
 408                 return NULL;
 409
 410         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 411                 nft_trans_rule_id(trans) =
 412                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 413         }
 414         nft_trans_rule(trans) = rule;
 415         nft_trans_commit_list_add_tail(ctx->net, trans);
 416
 417         return trans;
 418 }
 419
 420 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 421 {
 422         struct nft_flow_rule *flow;
 423         struct nft_trans *trans;
 424         int err;
 425
 426         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 427         if (trans == NULL)
 428                 return -ENOMEM;
 429
 430         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 431                 flow = nft_flow_rule_create(ctx->net, rule);
 432                 if (IS_ERR(flow)) {
 433                         nft_trans_destroy(trans);
 434                         return PTR_ERR(flow);
 435                 }
 436
 437                 nft_trans_flow_rule(trans) = flow;
 438         }
 439
 440         err = nf_tables_delrule_deactivate(ctx, rule);
 441         if (err < 0) {
 442                 nft_trans_destroy(trans);
 443                 return err;
 444         }
 445         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 446
 447         return 0;
 448 }
 449
 450 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 451 {
 452         struct nft_rule *rule;
 453         int err;
 454
 455         list_for_each_entry(rule, &ctx->chain->rules, list) {
 456                 if (!nft_is_active_next(ctx->net, rule))
 457                         continue;
 458
 459                 err = nft_delrule(ctx, rule);
 460                 if (err < 0)
 461                         return err;
 462         }
 463         return 0;
 464 }
 465
 466 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 467                                struct nft_set *set,
 468                                const struct nft_set_desc *desc)
 469 {
 470         struct nft_trans *trans;
 471
 472         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 473         if (trans == NULL)
 474                 return -ENOMEM;
 475
 476         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 477                 nft_trans_set_id(trans) =
 478                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 479                 nft_activate_next(ctx->net, set);
 480         }
 481         nft_trans_set(trans) = set;
 482         if (desc) {
 483                 nft_trans_set_update(trans) = true;
 484                 nft_trans_set_gc_int(trans) = desc->gc_int;
 485                 nft_trans_set_timeout(trans) = desc->timeout;
 486         }
 487         nft_trans_commit_list_add_tail(ctx->net, trans);
 488
 489         return 0;
 490 }
 491
 492 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 493                              struct nft_set *set)
 494 {
 495         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 496 }
 497
 498 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 499 {
 500         int err;
 501
 502         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 503         if (err < 0)
 504                 return err;
 505
 506         nft_deactivate_next(ctx->net, set);
 507         ctx->table->use--;
 508
 509         return err;
 510 }
 511
 512 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 513                              struct nft_object *obj)
 514 {
 515         struct nft_trans *trans;
 516
 517         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 518         if (trans == NULL)
 519                 return -ENOMEM;
 520
 521         if (msg_type == NFT_MSG_NEWOBJ)
 522                 nft_activate_next(ctx->net, obj);
 523
 524         nft_trans_obj(trans) = obj;
 525         nft_trans_commit_list_add_tail(ctx->net, trans);
 526
 527         return 0;
 528 }
 529
 530 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 531 {
 532         int err;
 533
 534         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 535         if (err < 0)
 536                 return err;
 537
 538         nft_deactivate_next(ctx->net, obj);
 539         ctx->table->use--;
 540
 541         return err;
 542 }
 543
 544 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 545                                    struct nft_flowtable *flowtable)
 546 {
 547         struct nft_trans *trans;
 548
 549         trans = nft_trans_alloc(ctx, msg_type,
 550                                 sizeof(struct nft_trans_flowtable));
 551         if (trans == NULL)
 552                 return -ENOMEM;
 553
 554         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 555                 nft_activate_next(ctx->net, flowtable);
 556
 557         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 558         nft_trans_flowtable(trans) = flowtable;
 559         nft_trans_commit_list_add_tail(ctx->net, trans);
 560
 561         return 0;
 562 }
 563
 564 static int nft_delflowtable(struct nft_ctx *ctx,
 565                             struct nft_flowtable *flowtable)
 566 {
 567         int err;
 568
 569         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 570         if (err < 0)
 571                 return err;
 572
 573         nft_deactivate_next(ctx->net, flowtable);
 574         ctx->table->use--;
 575
 576         return err;
 577 }
 578
 579 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 580 {
 581         int i;
 582
 583         for (i = track->regs[dreg].num_reg; i > 0; i--)
 584                 __nft_reg_track_cancel(track, dreg - i);
 585 }
 586
 587 static void __nft_reg_track_update(struct nft_regs_track *track,
 588                                    const struct nft_expr *expr,
 589                                    u8 dreg, u8 num_reg)
 590 {
 591         track->regs[dreg].selector = expr;
 592         track->regs[dreg].bitwise = NULL;
 593         track->regs[dreg].num_reg = num_reg;
 594 }
 595
 596 void nft_reg_track_update(struct nft_regs_track *track,
 597                           const struct nft_expr *expr, u8 dreg, u8 len)
 598 {
 599         unsigned int regcount;
 600         int i;
 601
 602         __nft_reg_track_clobber(track, dreg);
 603
 604         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 605         for (i = 0; i < regcount; i++, dreg++)
 606                 __nft_reg_track_update(track, expr, dreg, i);
 607 }
 608 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 609
 610 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 611 {
 612         unsigned int regcount;
 613         int i;
 614
 615         __nft_reg_track_clobber(track, dreg);
 616
 617         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 618         for (i = 0; i < regcount; i++, dreg++)
 619                 __nft_reg_track_cancel(track, dreg);
 620 }
 621 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 622
 623 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 624 {
 625         track->regs[dreg].selector = NULL;
 626         track->regs[dreg].bitwise = NULL;
 627         track->regs[dreg].num_reg = 0;
 628 }
 629 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 630
 631 /*
 632  * Tables
 633  */
 634
 635 static struct nft_table *nft_table_lookup(const struct net *net,
 636                                           const struct nlattr *nla,
 637                                           u8 family, u8 genmask, u32 nlpid)
 638 {
 639         struct nftables_pernet *nft_net;
 640         struct nft_table *table;
 641
 642         if (nla == NULL)
 643                 return ERR_PTR(-EINVAL);
 644
 645         nft_net = nft_pernet(net);
 646         list_for_each_entry_rcu(table, &nft_net->tables, list,
 647                                 lockdep_is_held(&nft_net->commit_mutex)) {
 648                 if (!nla_strcmp(nla, table->name) &&
 649                     table->family == family &&
 650                     nft_active_genmask(table, genmask)) {
 651                         if (nft_table_has_owner(table) &&
 652                             nlpid && table->nlpid != nlpid)
 653                                 return ERR_PTR(-EPERM);
 654
 655                         return table;
 656                 }
 657         }
 658
 659         return ERR_PTR(-ENOENT);
 660 }
 661
 662 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 663                                                    const struct nlattr *nla,
 664                                                    u8 genmask, u32 nlpid)
 665 {
 666         struct nftables_pernet *nft_net;
 667         struct nft_table *table;
 668
 669         nft_net = nft_pernet(net);
 670         list_for_each_entry(table, &nft_net->tables, list) {
 671                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 672                     nft_active_genmask(table, genmask)) {
 673                         if (nft_table_has_owner(table) &&
 674                             nlpid && table->nlpid != nlpid)
 675                                 return ERR_PTR(-EPERM);
 676
 677                         return table;
 678                 }
 679         }
 680
 681         return ERR_PTR(-ENOENT);
 682 }
 683
 684 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 685 {
 686         return ++table->hgenerator;
 687 }
 688
 689 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 690
 691 static const struct nft_chain_type *
 692 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 693 {
 694         if (family >= NFPROTO_NUMPROTO ||
 695             type >= NFT_CHAIN_T_MAX)
 696                 return NULL;
 697
 698         return chain_type[family][type];
 699 }
 700
 701 static const struct nft_chain_type *
 702 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 703 {
 704         const struct nft_chain_type *type;
 705         int i;
 706
 707         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 708                 type = __nft_chain_type_get(family, i);
 709                 if (!type)
 710                         continue;
 711                 if (!nla_strcmp(nla, type->name))
 712                         return type;
 713         }
 714         return NULL;
 715 }
 716
 717 struct nft_module_request {
 718         struct list_head        list;
 719         char                    module[MODULE_NAME_LEN];
 720         bool                    done;
 721 };
 722
 723 #ifdef CONFIG_MODULES
 724 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 725                                       ...)
 726 {
 727         char module_name[MODULE_NAME_LEN];
 728         struct nftables_pernet *nft_net;
 729         struct nft_module_request *req;
 730         va_list args;
 731         int ret;
 732
 733         va_start(args, fmt);
 734         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 735         va_end(args);
 736         if (ret >= MODULE_NAME_LEN)
 737                 return 0;
 738
 739         nft_net = nft_pernet(net);
 740         list_for_each_entry(req, &nft_net->module_list, list) {
 741                 if (!strcmp(req->module, module_name)) {
 742                         if (req->done)
 743                                 return 0;
 744
 745                         /* A request to load this module already exists. */
 746                         return -EAGAIN;
 747                 }
 748         }
 749
 750         req = kmalloc(sizeof(*req), GFP_KERNEL);
 751         if (!req)
 752                 return -ENOMEM;
 753
 754         req->done = false;
 755         strscpy(req->module, module_name, MODULE_NAME_LEN);
 756         list_add_tail(&req->list, &nft_net->module_list);
 757
 758         return -EAGAIN;
 759 }
 760 EXPORT_SYMBOL_GPL(nft_request_module);
 761 #endif
 762
 763 static void lockdep_nfnl_nft_mutex_not_held(void)
 764 {
 765 #ifdef CONFIG_PROVE_LOCKING
 766         if (debug_locks)
 767                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 768 #endif
 769 }
 770
 771 static const struct nft_chain_type *
 772 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 773                             u8 family, bool autoload)
 774 {
 775         const struct nft_chain_type *type;
 776
 777         type = __nf_tables_chain_type_lookup(nla, family);
 778         if (type != NULL)
 779                 return type;
 780
 781         lockdep_nfnl_nft_mutex_not_held();
 782 #ifdef CONFIG_MODULES
 783         if (autoload) {
 784                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 785                                        nla_len(nla),
 786                                        (const char *)nla_data(nla)) == -EAGAIN)
 787                         return ERR_PTR(-EAGAIN);
 788         }
 789 #endif
 790         return ERR_PTR(-ENOENT);
 791 }
 792
 793 static __be16 nft_base_seq(const struct net *net)
 794 {
 795         struct nftables_pernet *nft_net = nft_pernet(net);
 796
 797         return htons(nft_net->base_seq & 0xffff);
 798 }
 799
 800 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 801         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 802                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 803         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 804         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 805         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 806                                     .len = NFT_USERDATA_MAXLEN }
 807 };
 808
 809 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 810                                      u32 portid, u32 seq, int event, u32 flags,
 811                                      int family, const struct nft_table *table)
 812 {
 813         struct nlmsghdr *nlh;
 814
 815         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 816         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 817                            NFNETLINK_V0, nft_base_seq(net));
 818         if (!nlh)
 819                 goto nla_put_failure;
 820
 821         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 822             nla_put_be32(skb, NFTA_TABLE_FLAGS,
 823                          htonl(table->flags & NFT_TABLE_F_MASK)) ||
 824             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 825             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 826                          NFTA_TABLE_PAD))
 827                 goto nla_put_failure;
 828         if (nft_table_has_owner(table) &&
 829             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 830                 goto nla_put_failure;
 831
 832         if (table->udata) {
 833                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 834                         goto nla_put_failure;
 835         }
 836
 837         nlmsg_end(skb, nlh);
 838         return 0;
 839
 840 nla_put_failure:
 841         nlmsg_trim(skb, nlh);
 842         return -1;
 843 }
 844
 845 struct nftnl_skb_parms {
 846         bool report;
 847 };
 848 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 849
 850 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 851                                struct list_head *notify_list)
 852 {
 853         NFT_CB(skb).report = report;
 854         list_add_tail(&skb->list, notify_list);
 855 }
 856
 857 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 858 {
 859         struct nftables_pernet *nft_net;
 860         struct sk_buff *skb;
 861         u16 flags = 0;
 862         int err;
 863
 864         if (!ctx->report &&
 865             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 866                 return;
 867
 868         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 869         if (skb == NULL)
 870                 goto err;
 871
 872         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 873                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 874
 875         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 876                                         event, flags, ctx->family, ctx->table);
 877         if (err < 0) {
 878                 kfree_skb(skb);
 879                 goto err;
 880         }
 881
 882         nft_net = nft_pernet(ctx->net);
 883         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 884         return;
 885 err:
 886         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 887 }
 888
 889 static int nf_tables_dump_tables(struct sk_buff *skb,
 890                                  struct netlink_callback *cb)
 891 {
 892         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 893         struct nftables_pernet *nft_net;
 894         const struct nft_table *table;
 895         unsigned int idx = 0, s_idx = cb->args[0];
 896         struct net *net = sock_net(skb->sk);
 897         int family = nfmsg->nfgen_family;
 898
 899         rcu_read_lock();
 900         nft_net = nft_pernet(net);
 901         cb->seq = READ_ONCE(nft_net->base_seq);
 902
 903         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 904                 if (family != NFPROTO_UNSPEC && family != table->family)
 905                         continue;
 906
 907                 if (idx < s_idx)
 908                         goto cont;
 909                 if (idx > s_idx)
 910                         memset(&cb->args[1], 0,
 911                                sizeof(cb->args) - sizeof(cb->args[0]));
 912                 if (!nft_is_active(net, table))
 913                         continue;
 914                 if (nf_tables_fill_table_info(skb, net,
 915                                               NETLINK_CB(cb->skb).portid,
 916                                               cb->nlh->nlmsg_seq,
 917                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 918                                               table->family, table) < 0)
 919                         goto done;
 920
 921                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 922 cont:
 923                 idx++;
 924         }
 925 done:
 926         rcu_read_unlock();
 927         cb->args[0] = idx;
 928         return skb->len;
 929 }
 930
 931 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 932                                       const struct nlmsghdr *nlh,
 933                                       struct netlink_dump_control *c)
 934 {
 935         int err;
 936
 937         if (!try_module_get(THIS_MODULE))
 938                 return -EINVAL;
 939
 940         rcu_read_unlock();
 941         err = netlink_dump_start(nlsk, skb, nlh, c);
 942         rcu_read_lock();
 943         module_put(THIS_MODULE);
 944
 945         return err;
 946 }
 947
 948 /* called with rcu_read_lock held */
 949 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 950                               const struct nlattr * const nla[])
 951 {
 952         struct netlink_ext_ack *extack = info->extack;
 953         u8 genmask = nft_genmask_cur(info->net);
 954         u8 family = info->nfmsg->nfgen_family;
 955         const struct nft_table *table;
 956         struct net *net = info->net;
 957         struct sk_buff *skb2;
 958         int err;
 959
 960         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 961                 struct netlink_dump_control c = {
 962                         .dump = nf_tables_dump_tables,
 963                         .module = THIS_MODULE,
 964                 };
 965
 966                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 967         }
 968
 969         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 970         if (IS_ERR(table)) {
 971                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 972                 return PTR_ERR(table);
 973         }
 974
 975         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 976         if (!skb2)
 977                 return -ENOMEM;
 978
 979         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 980                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 981                                         0, family, table);
 982         if (err < 0)
 983                 goto err_fill_table_info;
 984
 985         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 986
 987 err_fill_table_info:
 988         kfree_skb(skb2);
 989         return err;
 990 }
 991
 992 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 993 {
 994         struct nft_chain *chain;
 995         u32 i = 0;
 996
 997         list_for_each_entry(chain, &table->chains, list) {
 998                 if (!nft_is_active_next(net, chain))
 999                         continue;
1000                 if (!nft_is_base_chain(chain))
1001                         continue;
1002
1003                 if (cnt && i++ == cnt)
1004                         break;
1005
1006                 nf_tables_unregister_hook(net, table, chain);
1007         }
1008 }
1009
1010 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1011 {
1012         struct nft_chain *chain;
1013         int err, i = 0;
1014
1015         list_for_each_entry(chain, &table->chains, list) {
1016                 if (!nft_is_active_next(net, chain))
1017                         continue;
1018                 if (!nft_is_base_chain(chain))
1019                         continue;
1020
1021                 err = nf_tables_register_hook(net, table, chain);
1022                 if (err < 0)
1023                         goto err_register_hooks;
1024
1025                 i++;
1026         }
1027         return 0;
1028
1029 err_register_hooks:
1030         if (i)
1031                 nft_table_disable(net, table, i);
1032         return err;
1033 }
1034
1035 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1036 {
1037         table->flags &= ~NFT_TABLE_F_DORMANT;
1038         nft_table_disable(net, table, 0);
1039         table->flags |= NFT_TABLE_F_DORMANT;
1040 }
1041
1042 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1043 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1044 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1045 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1046                                          __NFT_TABLE_F_WAS_AWAKEN)
1047
1048 static int nf_tables_updtable(struct nft_ctx *ctx)
1049 {
1050         struct nft_trans *trans;
1051         u32 flags;
1052         int ret;
1053
1054         if (!ctx->nla[NFTA_TABLE_FLAGS])
1055                 return 0;
1056
1057         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1058         if (flags & ~NFT_TABLE_F_MASK)
1059                 return -EOPNOTSUPP;
1060
1061         if (flags == ctx->table->flags)
1062                 return 0;
1063
1064         if ((nft_table_has_owner(ctx->table) &&
1065              !(flags & NFT_TABLE_F_OWNER)) ||
1066             (!nft_table_has_owner(ctx->table) &&
1067              flags & NFT_TABLE_F_OWNER))
1068                 return -EOPNOTSUPP;
1069
1070         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1071                                 sizeof(struct nft_trans_table));
1072         if (trans == NULL)
1073                 return -ENOMEM;
1074
1075         if ((flags & NFT_TABLE_F_DORMANT) &&
1076             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1077                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1078                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1079                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1080         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1081                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1082                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1083                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1084                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1085                         if (ret < 0)
1086                                 goto err_register_hooks;
1087
1088                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1089                 }
1090         }
1091
1092         nft_trans_table_update(trans) = true;
1093         nft_trans_commit_list_add_tail(ctx->net, trans);
1094
1095         return 0;
1096
1097 err_register_hooks:
1098         nft_trans_destroy(trans);
1099         return ret;
1100 }
1101
1102 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1103 {
1104         const char *name = data;
1105
1106         return jhash(name, strlen(name), seed);
1107 }
1108
1109 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1110 {
1111         const struct nft_chain *chain = data;
1112
1113         return nft_chain_hash(chain->name, 0, seed);
1114 }
1115
1116 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1117                               const void *ptr)
1118 {
1119         const struct nft_chain *chain = ptr;
1120         const char *name = arg->key;
1121
1122         return strcmp(chain->name, name);
1123 }
1124
1125 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1126 {
1127         const struct nft_object_hash_key *k = data;
1128
1129         seed ^= hash_ptr(k->table, 32);
1130
1131         return jhash(k->name, strlen(k->name), seed);
1132 }
1133
1134 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1135 {
1136         const struct nft_object *obj = data;
1137
1138         return nft_objname_hash(&obj->key, 0, seed);
1139 }
1140
1141 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1142                                 const void *ptr)
1143 {
1144         const struct nft_object_hash_key *k = arg->key;
1145         const struct nft_object *obj = ptr;
1146
1147         if (obj->key.table != k->table)
1148                 return -1;
1149
1150         return strcmp(obj->key.name, k->name);
1151 }
1152
1153 static bool nft_supported_family(u8 family)
1154 {
1155         return false
1156 #ifdef CONFIG_NF_TABLES_INET
1157                 || family == NFPROTO_INET
1158 #endif
1159 #ifdef CONFIG_NF_TABLES_IPV4
1160                 || family == NFPROTO_IPV4
1161 #endif
1162 #ifdef CONFIG_NF_TABLES_ARP
1163                 || family == NFPROTO_ARP
1164 #endif
1165 #ifdef CONFIG_NF_TABLES_NETDEV
1166                 || family == NFPROTO_NETDEV
1167 #endif
1168 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1169                 || family == NFPROTO_BRIDGE
1170 #endif
1171 #ifdef CONFIG_NF_TABLES_IPV6
1172                 || family == NFPROTO_IPV6
1173 #endif
1174                 ;
1175 }
1176
1177 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1178                               const struct nlattr * const nla[])
1179 {
1180         struct nftables_pernet *nft_net = nft_pernet(info->net);
1181         struct netlink_ext_ack *extack = info->extack;
1182         u8 genmask = nft_genmask_next(info->net);
1183         u8 family = info->nfmsg->nfgen_family;
1184         struct net *net = info->net;
1185         const struct nlattr *attr;
1186         struct nft_table *table;
1187         struct nft_ctx ctx;
1188         u32 flags = 0;
1189         int err;
1190
1191         if (!nft_supported_family(family))
1192                 return -EOPNOTSUPP;
1193
1194         lockdep_assert_held(&nft_net->commit_mutex);
1195         attr = nla[NFTA_TABLE_NAME];
1196         table = nft_table_lookup(net, attr, family, genmask,
1197                                  NETLINK_CB(skb).portid);
1198         if (IS_ERR(table)) {
1199                 if (PTR_ERR(table) != -ENOENT)
1200                         return PTR_ERR(table);
1201         } else {
1202                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1203                         NL_SET_BAD_ATTR(extack, attr);
1204                         return -EEXIST;
1205                 }
1206                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1207                         return -EOPNOTSUPP;
1208
1209                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1210
1211                 return nf_tables_updtable(&ctx);
1212         }
1213
1214         if (nla[NFTA_TABLE_FLAGS]) {
1215                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1216                 if (flags & ~NFT_TABLE_F_MASK)
1217                         return -EOPNOTSUPP;
1218         }
1219
1220         err = -ENOMEM;
1221         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1222         if (table == NULL)
1223                 goto err_kzalloc;
1224
1225         table->validate_state = NFT_VALIDATE_SKIP;
1226         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1227         if (table->name == NULL)
1228                 goto err_strdup;
1229
1230         if (nla[NFTA_TABLE_USERDATA]) {
1231                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1232                 if (table->udata == NULL)
1233                         goto err_table_udata;
1234
1235                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1236         }
1237
1238         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1239         if (err)
1240                 goto err_chain_ht;
1241
1242         INIT_LIST_HEAD(&table->chains);
1243         INIT_LIST_HEAD(&table->sets);
1244         INIT_LIST_HEAD(&table->objects);
1245         INIT_LIST_HEAD(&table->flowtables);
1246         table->family = family;
1247         table->flags = flags;
1248         table->handle = ++nft_net->table_handle;
1249         if (table->flags & NFT_TABLE_F_OWNER)
1250                 table->nlpid = NETLINK_CB(skb).portid;
1251
1252         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1253         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1254         if (err < 0)
1255                 goto err_trans;
1256
1257         list_add_tail_rcu(&table->list, &nft_net->tables);
1258         return 0;
1259 err_trans:
1260         rhltable_destroy(&table->chains_ht);
1261 err_chain_ht:
1262         kfree(table->udata);
1263 err_table_udata:
1264         kfree(table->name);
1265 err_strdup:
1266         kfree(table);
1267 err_kzalloc:
1268         return err;
1269 }
1270
1271 static int nft_flush_table(struct nft_ctx *ctx)
1272 {
1273         struct nft_flowtable *flowtable, *nft;
1274         struct nft_chain *chain, *nc;
1275         struct nft_object *obj, *ne;
1276         struct nft_set *set, *ns;
1277         int err;
1278
1279         list_for_each_entry(chain, &ctx->table->chains, list) {
1280                 if (!nft_is_active_next(ctx->net, chain))
1281                         continue;
1282
1283                 if (nft_chain_is_bound(chain))
1284                         continue;
1285
1286                 ctx->chain = chain;
1287
1288                 err = nft_delrule_by_chain(ctx);
1289                 if (err < 0)
1290                         goto out;
1291         }
1292
1293         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1294                 if (!nft_is_active_next(ctx->net, set))
1295                         continue;
1296
1297                 if (nft_set_is_anonymous(set) &&
1298                     !list_empty(&set->bindings))
1299                         continue;
1300
1301                 err = nft_delset(ctx, set);
1302                 if (err < 0)
1303                         goto out;
1304         }
1305
1306         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1307                 if (!nft_is_active_next(ctx->net, flowtable))
1308                         continue;
1309
1310                 err = nft_delflowtable(ctx, flowtable);
1311                 if (err < 0)
1312                         goto out;
1313         }
1314
1315         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1316                 if (!nft_is_active_next(ctx->net, obj))
1317                         continue;
1318
1319                 err = nft_delobj(ctx, obj);
1320                 if (err < 0)
1321                         goto out;
1322         }
1323
1324         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1325                 if (!nft_is_active_next(ctx->net, chain))
1326                         continue;
1327
1328                 if (nft_chain_is_bound(chain))
1329                         continue;
1330
1331                 ctx->chain = chain;
1332
1333                 err = nft_delchain(ctx);
1334                 if (err < 0)
1335                         goto out;
1336         }
1337
1338         err = nft_deltable(ctx);
1339 out:
1340         return err;
1341 }
1342
1343 static int nft_flush(struct nft_ctx *ctx, int family)
1344 {
1345         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1346         const struct nlattr * const *nla = ctx->nla;
1347         struct nft_table *table, *nt;
1348         int err = 0;
1349
1350         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1351                 if (family != AF_UNSPEC && table->family != family)
1352                         continue;
1353
1354                 ctx->family = table->family;
1355
1356                 if (!nft_is_active_next(ctx->net, table))
1357                         continue;
1358
1359                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1360                         continue;
1361
1362                 if (nla[NFTA_TABLE_NAME] &&
1363                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1364                         continue;
1365
1366                 ctx->table = table;
1367
1368                 err = nft_flush_table(ctx);
1369                 if (err < 0)
1370                         goto out;
1371         }
1372 out:
1373         return err;
1374 }
1375
1376 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1377                               const struct nlattr * const nla[])
1378 {
1379         struct netlink_ext_ack *extack = info->extack;
1380         u8 genmask = nft_genmask_next(info->net);
1381         u8 family = info->nfmsg->nfgen_family;
1382         struct net *net = info->net;
1383         const struct nlattr *attr;
1384         struct nft_table *table;
1385         struct nft_ctx ctx;
1386
1387         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1388         if (family == AF_UNSPEC ||
1389             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1390                 return nft_flush(&ctx, family);
1391
1392         if (nla[NFTA_TABLE_HANDLE]) {
1393                 attr = nla[NFTA_TABLE_HANDLE];
1394                 table = nft_table_lookup_byhandle(net, attr, genmask,
1395                                                   NETLINK_CB(skb).portid);
1396         } else {
1397                 attr = nla[NFTA_TABLE_NAME];
1398                 table = nft_table_lookup(net, attr, family, genmask,
1399                                          NETLINK_CB(skb).portid);
1400         }
1401
1402         if (IS_ERR(table)) {
1403                 if (PTR_ERR(table) == -ENOENT &&
1404                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1405                         return 0;
1406
1407                 NL_SET_BAD_ATTR(extack, attr);
1408                 return PTR_ERR(table);
1409         }
1410
1411         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1412             table->use > 0)
1413                 return -EBUSY;
1414
1415         ctx.family = family;
1416         ctx.table = table;
1417
1418         return nft_flush_table(&ctx);
1419 }
1420
1421 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1422 {
1423         if (WARN_ON(ctx->table->use > 0))
1424                 return;
1425
1426         rhltable_destroy(&ctx->table->chains_ht);
1427         kfree(ctx->table->name);
1428         kfree(ctx->table->udata);
1429         kfree(ctx->table);
1430 }
1431
1432 void nft_register_chain_type(const struct nft_chain_type *ctype)
1433 {
1434         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1435         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1436                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1437                 return;
1438         }
1439         chain_type[ctype->family][ctype->type] = ctype;
1440         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1441 }
1442 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1443
1444 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1445 {
1446         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1447         chain_type[ctype->family][ctype->type] = NULL;
1448         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1449 }
1450 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1451
1452 /*
1453  * Chains
1454  */
1455
1456 static struct nft_chain *
1457 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1458 {
1459         struct nft_chain *chain;
1460
1461         list_for_each_entry(chain, &table->chains, list) {
1462                 if (chain->handle == handle &&
1463                     nft_active_genmask(chain, genmask))
1464                         return chain;
1465         }
1466
1467         return ERR_PTR(-ENOENT);
1468 }
1469
1470 static bool lockdep_commit_lock_is_held(const struct net *net)
1471 {
1472 #ifdef CONFIG_PROVE_LOCKING
1473         struct nftables_pernet *nft_net = nft_pernet(net);
1474
1475         return lockdep_is_held(&nft_net->commit_mutex);
1476 #else
1477         return true;
1478 #endif
1479 }
1480
1481 static struct nft_chain *nft_chain_lookup(struct net *net,
1482                                           struct nft_table *table,
1483                                           const struct nlattr *nla, u8 genmask)
1484 {
1485         char search[NFT_CHAIN_MAXNAMELEN + 1];
1486         struct rhlist_head *tmp, *list;
1487         struct nft_chain *chain;
1488
1489         if (nla == NULL)
1490                 return ERR_PTR(-EINVAL);
1491
1492         nla_strscpy(search, nla, sizeof(search));
1493
1494         WARN_ON(!rcu_read_lock_held() &&
1495                 !lockdep_commit_lock_is_held(net));
1496
1497         chain = ERR_PTR(-ENOENT);
1498         rcu_read_lock();
1499         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1500         if (!list)
1501                 goto out_unlock;
1502
1503         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1504                 if (nft_active_genmask(chain, genmask))
1505                         goto out_unlock;
1506         }
1507         chain = ERR_PTR(-ENOENT);
1508 out_unlock:
1509         rcu_read_unlock();
1510         return chain;
1511 }
1512
1513 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1514         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1515                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1516         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1517         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1518                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1519         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1520         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1521         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1522                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1523         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1524         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1525         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1526         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1527                                     .len = NFT_USERDATA_MAXLEN },
1528 };
1529
1530 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1531         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1532         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1533         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1534                                     .len = IFNAMSIZ - 1 },
1535 };
1536
1537 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1538 {
1539         struct nft_stats *cpu_stats, total;
1540         struct nlattr *nest;
1541         unsigned int seq;
1542         u64 pkts, bytes;
1543         int cpu;
1544
1545         if (!stats)
1546                 return 0;
1547
1548         memset(&total, 0, sizeof(total));
1549         for_each_possible_cpu(cpu) {
1550                 cpu_stats = per_cpu_ptr(stats, cpu);
1551                 do {
1552                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1553                         pkts = cpu_stats->pkts;
1554                         bytes = cpu_stats->bytes;
1555                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1556                 total.pkts += pkts;
1557                 total.bytes += bytes;
1558         }
1559         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1560         if (nest == NULL)
1561                 goto nla_put_failure;
1562
1563         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1564                          NFTA_COUNTER_PAD) ||
1565             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1566                          NFTA_COUNTER_PAD))
1567                 goto nla_put_failure;
1568
1569         nla_nest_end(skb, nest);
1570         return 0;
1571
1572 nla_put_failure:
1573         return -ENOSPC;
1574 }
1575
1576 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1577                                    const struct nft_base_chain *basechain)
1578 {
1579         const struct nf_hook_ops *ops = &basechain->ops;
1580         struct nft_hook *hook, *first = NULL;
1581         struct nlattr *nest, *nest_devs;
1582         int n = 0;
1583
1584         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1585         if (nest == NULL)
1586                 goto nla_put_failure;
1587         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1588                 goto nla_put_failure;
1589         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1590                 goto nla_put_failure;
1591
1592         if (nft_base_chain_netdev(family, ops->hooknum)) {
1593                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1594                 list_for_each_entry(hook, &basechain->hook_list, list) {
1595                         if (!first)
1596                                 first = hook;
1597
1598                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1599                                            hook->ops.dev->name))
1600                                 goto nla_put_failure;
1601                         n++;
1602                 }
1603                 nla_nest_end(skb, nest_devs);
1604
1605                 if (n == 1 &&
1606                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1607                         goto nla_put_failure;
1608         }
1609         nla_nest_end(skb, nest);
1610
1611         return 0;
1612 nla_put_failure:
1613         return -1;
1614 }
1615
1616 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1617                                      u32 portid, u32 seq, int event, u32 flags,
1618                                      int family, const struct nft_table *table,
1619                                      const struct nft_chain *chain)
1620 {
1621         struct nlmsghdr *nlh;
1622
1623         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1624         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1625                            NFNETLINK_V0, nft_base_seq(net));
1626         if (!nlh)
1627                 goto nla_put_failure;
1628
1629         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1630                 goto nla_put_failure;
1631         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1632                          NFTA_CHAIN_PAD))
1633                 goto nla_put_failure;
1634         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1635                 goto nla_put_failure;
1636
1637         if (nft_is_base_chain(chain)) {
1638                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1639                 struct nft_stats __percpu *stats;
1640
1641                 if (nft_dump_basechain_hook(skb, family, basechain))
1642                         goto nla_put_failure;
1643
1644                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1645                                  htonl(basechain->policy)))
1646                         goto nla_put_failure;
1647
1648                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1649                         goto nla_put_failure;
1650
1651                 stats = rcu_dereference_check(basechain->stats,
1652                                               lockdep_commit_lock_is_held(net));
1653                 if (nft_dump_stats(skb, stats))
1654                         goto nla_put_failure;
1655         }
1656
1657         if (chain->flags &&
1658             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1659                 goto nla_put_failure;
1660
1661         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1662                 goto nla_put_failure;
1663
1664         if (chain->udata &&
1665             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1666                 goto nla_put_failure;
1667
1668         nlmsg_end(skb, nlh);
1669         return 0;
1670
1671 nla_put_failure:
1672         nlmsg_trim(skb, nlh);
1673         return -1;
1674 }
1675
1676 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1677 {
1678         struct nftables_pernet *nft_net;
1679         struct sk_buff *skb;
1680         u16 flags = 0;
1681         int err;
1682
1683         if (!ctx->report &&
1684             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1685                 return;
1686
1687         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1688         if (skb == NULL)
1689                 goto err;
1690
1691         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1692                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1693
1694         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1695                                         event, flags, ctx->family, ctx->table,
1696                                         ctx->chain);
1697         if (err < 0) {
1698                 kfree_skb(skb);
1699                 goto err;
1700         }
1701
1702         nft_net = nft_pernet(ctx->net);
1703         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1704         return;
1705 err:
1706         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1707 }
1708
1709 static int nf_tables_dump_chains(struct sk_buff *skb,
1710                                  struct netlink_callback *cb)
1711 {
1712         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1713         unsigned int idx = 0, s_idx = cb->args[0];
1714         struct net *net = sock_net(skb->sk);
1715         int family = nfmsg->nfgen_family;
1716         struct nftables_pernet *nft_net;
1717         const struct nft_table *table;
1718         const struct nft_chain *chain;
1719
1720         rcu_read_lock();
1721         nft_net = nft_pernet(net);
1722         cb->seq = READ_ONCE(nft_net->base_seq);
1723
1724         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1725                 if (family != NFPROTO_UNSPEC && family != table->family)
1726                         continue;
1727
1728                 list_for_each_entry_rcu(chain, &table->chains, list) {
1729                         if (idx < s_idx)
1730                                 goto cont;
1731                         if (idx > s_idx)
1732                                 memset(&cb->args[1], 0,
1733                                        sizeof(cb->args) - sizeof(cb->args[0]));
1734                         if (!nft_is_active(net, chain))
1735                                 continue;
1736                         if (nf_tables_fill_chain_info(skb, net,
1737                                                       NETLINK_CB(cb->skb).portid,
1738                                                       cb->nlh->nlmsg_seq,
1739                                                       NFT_MSG_NEWCHAIN,
1740                                                       NLM_F_MULTI,
1741                                                       table->family, table,
1742                                                       chain) < 0)
1743                                 goto done;
1744
1745                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1746 cont:
1747                         idx++;
1748                 }
1749         }
1750 done:
1751         rcu_read_unlock();
1752         cb->args[0] = idx;
1753         return skb->len;
1754 }
1755
1756 /* called with rcu_read_lock held */
1757 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1758                               const struct nlattr * const nla[])
1759 {
1760         struct netlink_ext_ack *extack = info->extack;
1761         u8 genmask = nft_genmask_cur(info->net);
1762         u8 family = info->nfmsg->nfgen_family;
1763         const struct nft_chain *chain;
1764         struct net *net = info->net;
1765         struct nft_table *table;
1766         struct sk_buff *skb2;
1767         int err;
1768
1769         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1770                 struct netlink_dump_control c = {
1771                         .dump = nf_tables_dump_chains,
1772                         .module = THIS_MODULE,
1773                 };
1774
1775                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1776         }
1777
1778         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1779         if (IS_ERR(table)) {
1780                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1781                 return PTR_ERR(table);
1782         }
1783
1784         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1785         if (IS_ERR(chain)) {
1786                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1787                 return PTR_ERR(chain);
1788         }
1789
1790         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1791         if (!skb2)
1792                 return -ENOMEM;
1793
1794         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1795                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1796                                         0, family, table, chain);
1797         if (err < 0)
1798                 goto err_fill_chain_info;
1799
1800         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1801
1802 err_fill_chain_info:
1803         kfree_skb(skb2);
1804         return err;
1805 }
1806
1807 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1808         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1809         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1810 };
1811
1812 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1813 {
1814         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1815         struct nft_stats __percpu *newstats;
1816         struct nft_stats *stats;
1817         int err;
1818
1819         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1820                                           nft_counter_policy, NULL);
1821         if (err < 0)
1822                 return ERR_PTR(err);
1823
1824         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1825                 return ERR_PTR(-EINVAL);
1826
1827         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1828         if (newstats == NULL)
1829                 return ERR_PTR(-ENOMEM);
1830
1831         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1832          * are not exposed to userspace.
1833          */
1834         preempt_disable();
1835         stats = this_cpu_ptr(newstats);
1836         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1837         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1838         preempt_enable();
1839
1840         return newstats;
1841 }
1842
1843 static void nft_chain_stats_replace(struct nft_trans *trans)
1844 {
1845         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1846
1847         if (!nft_trans_chain_stats(trans))
1848                 return;
1849
1850         nft_trans_chain_stats(trans) =
1851                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1852                                     lockdep_commit_lock_is_held(trans->ctx.net));
1853
1854         if (!nft_trans_chain_stats(trans))
1855                 static_branch_inc(&nft_counters_enabled);
1856 }
1857
1858 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1859 {
1860         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1861         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1862
1863         if (g0 != g1)
1864                 kvfree(g1);
1865         kvfree(g0);
1866
1867         /* should be NULL either via abort or via successful commit */
1868         WARN_ON_ONCE(chain->blob_next);
1869         kvfree(chain->blob_next);
1870 }
1871
1872 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1873 {
1874         struct nft_chain *chain = ctx->chain;
1875         struct nft_hook *hook, *next;
1876
1877         if (WARN_ON(chain->use > 0))
1878                 return;
1879
1880         /* no concurrent access possible anymore */
1881         nf_tables_chain_free_chain_rules(chain);
1882
1883         if (nft_is_base_chain(chain)) {
1884                 struct nft_base_chain *basechain = nft_base_chain(chain);
1885
1886                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1887                         list_for_each_entry_safe(hook, next,
1888                                                  &basechain->hook_list, list) {
1889                                 list_del_rcu(&hook->list);
1890                                 kfree_rcu(hook, rcu);
1891                         }
1892                 }
1893                 module_put(basechain->type->owner);
1894                 if (rcu_access_pointer(basechain->stats)) {
1895                         static_branch_dec(&nft_counters_enabled);
1896                         free_percpu(rcu_dereference_raw(basechain->stats));
1897                 }
1898                 kfree(chain->name);
1899                 kfree(chain->udata);
1900                 kfree(basechain);
1901         } else {
1902                 kfree(chain->name);
1903                 kfree(chain->udata);
1904                 kfree(chain);
1905         }
1906 }
1907
1908 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1909                                               const struct nlattr *attr)
1910 {
1911         struct net_device *dev;
1912         char ifname[IFNAMSIZ];
1913         struct nft_hook *hook;
1914         int err;
1915
1916         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
1917         if (!hook) {
1918                 err = -ENOMEM;
1919                 goto err_hook_alloc;
1920         }
1921
1922         nla_strscpy(ifname, attr, IFNAMSIZ);
1923         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1924          * indirectly serializing all the other holders of the commit_mutex with
1925          * the rtnl_mutex.
1926          */
1927         dev = __dev_get_by_name(net, ifname);
1928         if (!dev) {
1929                 err = -ENOENT;
1930                 goto err_hook_dev;
1931         }
1932         hook->ops.dev = dev;
1933
1934         return hook;
1935
1936 err_hook_dev:
1937         kfree(hook);
1938 err_hook_alloc:
1939         return ERR_PTR(err);
1940 }
1941
1942 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1943                                            const struct nft_hook *this)
1944 {
1945         struct nft_hook *hook;
1946
1947         list_for_each_entry(hook, hook_list, list) {
1948                 if (this->ops.dev == hook->ops.dev)
1949                         return hook;
1950         }
1951
1952         return NULL;
1953 }
1954
1955 static int nf_tables_parse_netdev_hooks(struct net *net,
1956                                         const struct nlattr *attr,
1957                                         struct list_head *hook_list)
1958 {
1959         struct nft_hook *hook, *next;
1960         const struct nlattr *tmp;
1961         int rem, n = 0, err;
1962
1963         nla_for_each_nested(tmp, attr, rem) {
1964                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1965                         err = -EINVAL;
1966                         goto err_hook;
1967                 }
1968
1969                 hook = nft_netdev_hook_alloc(net, tmp);
1970                 if (IS_ERR(hook)) {
1971                         err = PTR_ERR(hook);
1972                         goto err_hook;
1973                 }
1974                 if (nft_hook_list_find(hook_list, hook)) {
1975                         kfree(hook);
1976                         err = -EEXIST;
1977                         goto err_hook;
1978                 }
1979                 list_add_tail(&hook->list, hook_list);
1980                 n++;
1981
1982                 if (n == NFT_NETDEVICE_MAX) {
1983                         err = -EFBIG;
1984                         goto err_hook;
1985                 }
1986         }
1987
1988         return 0;
1989
1990 err_hook:
1991         list_for_each_entry_safe(hook, next, hook_list, list) {
1992                 list_del(&hook->list);
1993                 kfree(hook);
1994         }
1995         return err;
1996 }
1997
1998 struct nft_chain_hook {
1999         u32                             num;
2000         s32                             priority;
2001         const struct nft_chain_type     *type;
2002         struct list_head                list;
2003 };
2004
2005 static int nft_chain_parse_netdev(struct net *net,
2006                                   struct nlattr *tb[],
2007                                   struct list_head *hook_list)
2008 {
2009         struct nft_hook *hook;
2010         int err;
2011
2012         if (tb[NFTA_HOOK_DEV]) {
2013                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2014                 if (IS_ERR(hook))
2015                         return PTR_ERR(hook);
2016
2017                 list_add_tail(&hook->list, hook_list);
2018         } else if (tb[NFTA_HOOK_DEVS]) {
2019                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2020                                                    hook_list);
2021                 if (err < 0)
2022                         return err;
2023
2024                 if (list_empty(hook_list))
2025                         return -EINVAL;
2026         } else {
2027                 return -EINVAL;
2028         }
2029
2030         return 0;
2031 }
2032
2033 static int nft_chain_parse_hook(struct net *net,
2034                                 const struct nlattr * const nla[],
2035                                 struct nft_chain_hook *hook, u8 family,
2036                                 struct netlink_ext_ack *extack, bool autoload)
2037 {
2038         struct nftables_pernet *nft_net = nft_pernet(net);
2039         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2040         const struct nft_chain_type *type;
2041         int err;
2042
2043         lockdep_assert_held(&nft_net->commit_mutex);
2044         lockdep_nfnl_nft_mutex_not_held();
2045
2046         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2047                                           nla[NFTA_CHAIN_HOOK],
2048                                           nft_hook_policy, NULL);
2049         if (err < 0)
2050                 return err;
2051
2052         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
2053             ha[NFTA_HOOK_PRIORITY] == NULL)
2054                 return -EINVAL;
2055
2056         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2057         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2058
2059         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2060         if (!type)
2061                 return -EOPNOTSUPP;
2062
2063         if (nla[NFTA_CHAIN_TYPE]) {
2064                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2065                                                    family, autoload);
2066                 if (IS_ERR(type)) {
2067                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2068                         return PTR_ERR(type);
2069                 }
2070         }
2071         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2072                 return -EOPNOTSUPP;
2073
2074         if (type->type == NFT_CHAIN_T_NAT &&
2075             hook->priority <= NF_IP_PRI_CONNTRACK)
2076                 return -EOPNOTSUPP;
2077
2078         if (!try_module_get(type->owner)) {
2079                 if (nla[NFTA_CHAIN_TYPE])
2080                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2081                 return -ENOENT;
2082         }
2083
2084         hook->type = type;
2085
2086         INIT_LIST_HEAD(&hook->list);
2087         if (nft_base_chain_netdev(family, hook->num)) {
2088                 err = nft_chain_parse_netdev(net, ha, &hook->list);
2089                 if (err < 0) {
2090                         module_put(type->owner);
2091                         return err;
2092                 }
2093         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2094                 module_put(type->owner);
2095                 return -EOPNOTSUPP;
2096         }
2097
2098         return 0;
2099 }
2100
2101 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2102 {
2103         struct nft_hook *h, *next;
2104
2105         list_for_each_entry_safe(h, next, &hook->list, list) {
2106                 list_del(&h->list);
2107                 kfree(h);
2108         }
2109         module_put(hook->type->owner);
2110 }
2111
2112 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2113 {
2114         struct nft_rule_dp_last *lrule;
2115
2116         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2117
2118         lrule = (struct nft_rule_dp_last *)ptr;
2119         lrule->end.is_last = 1;
2120         lrule->chain = chain;
2121         /* blob size does not include the trailer rule */
2122 }
2123
2124 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2125                                                          unsigned int size)
2126 {
2127         struct nft_rule_blob *blob;
2128
2129         if (size > INT_MAX)
2130                 return NULL;
2131
2132         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2133
2134         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2135         if (!blob)
2136                 return NULL;
2137
2138         blob->size = 0;
2139         nft_last_rule(chain, blob->data);
2140
2141         return blob;
2142 }
2143
2144 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2145                                     const struct nft_chain_hook *hook,
2146                                     struct nft_chain *chain)
2147 {
2148         ops->pf                 = family;
2149         ops->hooknum            = hook->num;
2150         ops->priority           = hook->priority;
2151         ops->priv               = chain;
2152         ops->hook               = hook->type->hooks[ops->hooknum];
2153         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2154 }
2155
2156 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2157                               struct nft_chain_hook *hook, u32 flags)
2158 {
2159         struct nft_chain *chain;
2160         struct nft_hook *h;
2161
2162         basechain->type = hook->type;
2163         INIT_LIST_HEAD(&basechain->hook_list);
2164         chain = &basechain->chain;
2165
2166         if (nft_base_chain_netdev(family, hook->num)) {
2167                 list_splice_init(&hook->list, &basechain->hook_list);
2168                 list_for_each_entry(h, &basechain->hook_list, list)
2169                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2170
2171                 basechain->ops.hooknum  = hook->num;
2172                 basechain->ops.priority = hook->priority;
2173         } else {
2174                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2175         }
2176
2177         chain->flags |= NFT_CHAIN_BASE | flags;
2178         basechain->policy = NF_ACCEPT;
2179         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2180             !nft_chain_offload_support(basechain)) {
2181                 list_splice_init(&basechain->hook_list, &hook->list);
2182                 return -EOPNOTSUPP;
2183         }
2184
2185         flow_block_init(&basechain->flow_block);
2186
2187         return 0;
2188 }
2189
2190 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2191 {
2192         int err;
2193
2194         err = rhltable_insert_key(&table->chains_ht, chain->name,
2195                                   &chain->rhlhead, nft_chain_ht_params);
2196         if (err)
2197                 return err;
2198
2199         list_add_tail_rcu(&chain->list, &table->chains);
2200
2201         return 0;
2202 }
2203
2204 static u64 chain_id;
2205
2206 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2207                               u8 policy, u32 flags,
2208                               struct netlink_ext_ack *extack)
2209 {
2210         const struct nlattr * const *nla = ctx->nla;
2211         struct nft_table *table = ctx->table;
2212         struct nft_base_chain *basechain;
2213         struct net *net = ctx->net;
2214         char name[NFT_NAME_MAXLEN];
2215         struct nft_rule_blob *blob;
2216         struct nft_trans *trans;
2217         struct nft_chain *chain;
2218         int err;
2219
2220         if (table->use == UINT_MAX)
2221                 return -EOVERFLOW;
2222
2223         if (nla[NFTA_CHAIN_HOOK]) {
2224                 struct nft_stats __percpu *stats = NULL;
2225                 struct nft_chain_hook hook;
2226
2227                 if (flags & NFT_CHAIN_BINDING)
2228                         return -EOPNOTSUPP;
2229
2230                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2231                                            true);
2232                 if (err < 0)
2233                         return err;
2234
2235                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2236                 if (basechain == NULL) {
2237                         nft_chain_release_hook(&hook);
2238                         return -ENOMEM;
2239                 }
2240                 chain = &basechain->chain;
2241
2242                 if (nla[NFTA_CHAIN_COUNTERS]) {
2243                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2244                         if (IS_ERR(stats)) {
2245                                 nft_chain_release_hook(&hook);
2246                                 kfree(basechain);
2247                                 return PTR_ERR(stats);
2248                         }
2249                         rcu_assign_pointer(basechain->stats, stats);
2250                 }
2251
2252                 err = nft_basechain_init(basechain, family, &hook, flags);
2253                 if (err < 0) {
2254                         nft_chain_release_hook(&hook);
2255                         kfree(basechain);
2256                         free_percpu(stats);
2257                         return err;
2258                 }
2259                 if (stats)
2260                         static_branch_inc(&nft_counters_enabled);
2261         } else {
2262                 if (flags & NFT_CHAIN_BASE)
2263                         return -EINVAL;
2264                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2265                         return -EOPNOTSUPP;
2266
2267                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2268                 if (chain == NULL)
2269                         return -ENOMEM;
2270
2271                 chain->flags = flags;
2272         }
2273         ctx->chain = chain;
2274
2275         INIT_LIST_HEAD(&chain->rules);
2276         chain->handle = nf_tables_alloc_handle(table);
2277         chain->table = table;
2278
2279         if (nla[NFTA_CHAIN_NAME]) {
2280                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2281         } else {
2282                 if (!(flags & NFT_CHAIN_BINDING)) {
2283                         err = -EINVAL;
2284                         goto err_destroy_chain;
2285                 }
2286
2287                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2288                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2289         }
2290
2291         if (!chain->name) {
2292                 err = -ENOMEM;
2293                 goto err_destroy_chain;
2294         }
2295
2296         if (nla[NFTA_CHAIN_USERDATA]) {
2297                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2298                 if (chain->udata == NULL) {
2299                         err = -ENOMEM;
2300                         goto err_destroy_chain;
2301                 }
2302                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2303         }
2304
2305         blob = nf_tables_chain_alloc_rules(chain, 0);
2306         if (!blob) {
2307                 err = -ENOMEM;
2308                 goto err_destroy_chain;
2309         }
2310
2311         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2312         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2313
2314         err = nf_tables_register_hook(net, table, chain);
2315         if (err < 0)
2316                 goto err_destroy_chain;
2317
2318         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2319         if (IS_ERR(trans)) {
2320                 err = PTR_ERR(trans);
2321                 goto err_unregister_hook;
2322         }
2323
2324         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2325         if (nft_is_base_chain(chain))
2326                 nft_trans_chain_policy(trans) = policy;
2327
2328         err = nft_chain_add(table, chain);
2329         if (err < 0) {
2330                 nft_trans_destroy(trans);
2331                 goto err_unregister_hook;
2332         }
2333
2334         table->use++;
2335
2336         return 0;
2337 err_unregister_hook:
2338         nf_tables_unregister_hook(net, table, chain);
2339 err_destroy_chain:
2340         nf_tables_chain_destroy(ctx);
2341
2342         return err;
2343 }
2344
2345 static bool nft_hook_list_equal(struct list_head *hook_list1,
2346                                 struct list_head *hook_list2)
2347 {
2348         struct nft_hook *hook;
2349         int n = 0, m = 0;
2350
2351         n = 0;
2352         list_for_each_entry(hook, hook_list2, list) {
2353                 if (!nft_hook_list_find(hook_list1, hook))
2354                         return false;
2355
2356                 n++;
2357         }
2358         list_for_each_entry(hook, hook_list1, list)
2359                 m++;
2360
2361         return n == m;
2362 }
2363
2364 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2365                               u32 flags, const struct nlattr *attr,
2366                               struct netlink_ext_ack *extack)
2367 {
2368         const struct nlattr * const *nla = ctx->nla;
2369         struct nft_table *table = ctx->table;
2370         struct nft_chain *chain = ctx->chain;
2371         struct nft_base_chain *basechain;
2372         struct nft_stats *stats = NULL;
2373         struct nft_chain_hook hook;
2374         struct nf_hook_ops *ops;
2375         struct nft_trans *trans;
2376         int err;
2377
2378         if (chain->flags ^ flags)
2379                 return -EOPNOTSUPP;
2380
2381         if (nla[NFTA_CHAIN_HOOK]) {
2382                 if (!nft_is_base_chain(chain)) {
2383                         NL_SET_BAD_ATTR(extack, attr);
2384                         return -EEXIST;
2385                 }
2386                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2387                                            extack, false);
2388                 if (err < 0)
2389                         return err;
2390
2391                 basechain = nft_base_chain(chain);
2392                 if (basechain->type != hook.type) {
2393                         nft_chain_release_hook(&hook);
2394                         NL_SET_BAD_ATTR(extack, attr);
2395                         return -EEXIST;
2396                 }
2397
2398                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2399                         if (!nft_hook_list_equal(&basechain->hook_list,
2400                                                  &hook.list)) {
2401                                 nft_chain_release_hook(&hook);
2402                                 NL_SET_BAD_ATTR(extack, attr);
2403                                 return -EEXIST;
2404                         }
2405                 } else {
2406                         ops = &basechain->ops;
2407                         if (ops->hooknum != hook.num ||
2408                             ops->priority != hook.priority) {
2409                                 nft_chain_release_hook(&hook);
2410                                 NL_SET_BAD_ATTR(extack, attr);
2411                                 return -EEXIST;
2412                         }
2413                 }
2414                 nft_chain_release_hook(&hook);
2415         }
2416
2417         if (nla[NFTA_CHAIN_HANDLE] &&
2418             nla[NFTA_CHAIN_NAME]) {
2419                 struct nft_chain *chain2;
2420
2421                 chain2 = nft_chain_lookup(ctx->net, table,
2422                                           nla[NFTA_CHAIN_NAME], genmask);
2423                 if (!IS_ERR(chain2)) {
2424                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2425                         return -EEXIST;
2426                 }
2427         }
2428
2429         if (nla[NFTA_CHAIN_COUNTERS]) {
2430                 if (!nft_is_base_chain(chain))
2431                         return -EOPNOTSUPP;
2432
2433                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2434                 if (IS_ERR(stats))
2435                         return PTR_ERR(stats);
2436         }
2437
2438         err = -ENOMEM;
2439         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2440                                 sizeof(struct nft_trans_chain));
2441         if (trans == NULL)
2442                 goto err;
2443
2444         nft_trans_chain_stats(trans) = stats;
2445         nft_trans_chain_update(trans) = true;
2446
2447         if (nla[NFTA_CHAIN_POLICY])
2448                 nft_trans_chain_policy(trans) = policy;
2449         else
2450                 nft_trans_chain_policy(trans) = -1;
2451
2452         if (nla[NFTA_CHAIN_HANDLE] &&
2453             nla[NFTA_CHAIN_NAME]) {
2454                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2455                 struct nft_trans *tmp;
2456                 char *name;
2457
2458                 err = -ENOMEM;
2459                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2460                 if (!name)
2461                         goto err;
2462
2463                 err = -EEXIST;
2464                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2465                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2466                             tmp->ctx.table == table &&
2467                             nft_trans_chain_update(tmp) &&
2468                             nft_trans_chain_name(tmp) &&
2469                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2470                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2471                                 kfree(name);
2472                                 goto err;
2473                         }
2474                 }
2475
2476                 nft_trans_chain_name(trans) = name;
2477         }
2478         nft_trans_commit_list_add_tail(ctx->net, trans);
2479
2480         return 0;
2481 err:
2482         free_percpu(stats);
2483         kfree(trans);
2484         return err;
2485 }
2486
2487 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2488                                                const struct nft_table *table,
2489                                                const struct nlattr *nla)
2490 {
2491         struct nftables_pernet *nft_net = nft_pernet(net);
2492         u32 id = ntohl(nla_get_be32(nla));
2493         struct nft_trans *trans;
2494
2495         list_for_each_entry(trans, &nft_net->commit_list, list) {
2496                 struct nft_chain *chain = trans->ctx.chain;
2497
2498                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2499                     chain->table == table &&
2500                     id == nft_trans_chain_id(trans))
2501                         return chain;
2502         }
2503         return ERR_PTR(-ENOENT);
2504 }
2505
2506 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2507                               const struct nlattr * const nla[])
2508 {
2509         struct nftables_pernet *nft_net = nft_pernet(info->net);
2510         struct netlink_ext_ack *extack = info->extack;
2511         u8 genmask = nft_genmask_next(info->net);
2512         u8 family = info->nfmsg->nfgen_family;
2513         struct nft_chain *chain = NULL;
2514         struct net *net = info->net;
2515         const struct nlattr *attr;
2516         struct nft_table *table;
2517         u8 policy = NF_ACCEPT;
2518         struct nft_ctx ctx;
2519         u64 handle = 0;
2520         u32 flags = 0;
2521
2522         lockdep_assert_held(&nft_net->commit_mutex);
2523
2524         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2525                                  NETLINK_CB(skb).portid);
2526         if (IS_ERR(table)) {
2527                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2528                 return PTR_ERR(table);
2529         }
2530
2531         chain = NULL;
2532         attr = nla[NFTA_CHAIN_NAME];
2533
2534         if (nla[NFTA_CHAIN_HANDLE]) {
2535                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2536                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2537                 if (IS_ERR(chain)) {
2538                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2539                         return PTR_ERR(chain);
2540                 }
2541                 attr = nla[NFTA_CHAIN_HANDLE];
2542         } else if (nla[NFTA_CHAIN_NAME]) {
2543                 chain = nft_chain_lookup(net, table, attr, genmask);
2544                 if (IS_ERR(chain)) {
2545                         if (PTR_ERR(chain) != -ENOENT) {
2546                                 NL_SET_BAD_ATTR(extack, attr);
2547                                 return PTR_ERR(chain);
2548                         }
2549                         chain = NULL;
2550                 }
2551         } else if (!nla[NFTA_CHAIN_ID]) {
2552                 return -EINVAL;
2553         }
2554
2555         if (nla[NFTA_CHAIN_POLICY]) {
2556                 if (chain != NULL &&
2557                     !nft_is_base_chain(chain)) {
2558                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2559                         return -EOPNOTSUPP;
2560                 }
2561
2562                 if (chain == NULL &&
2563                     nla[NFTA_CHAIN_HOOK] == NULL) {
2564                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2565                         return -EOPNOTSUPP;
2566                 }
2567
2568                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2569                 switch (policy) {
2570                 case NF_DROP:
2571                 case NF_ACCEPT:
2572                         break;
2573                 default:
2574                         return -EINVAL;
2575                 }
2576         }
2577
2578         if (nla[NFTA_CHAIN_FLAGS])
2579                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2580         else if (chain)
2581                 flags = chain->flags;
2582
2583         if (flags & ~NFT_CHAIN_FLAGS)
2584                 return -EOPNOTSUPP;
2585
2586         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2587
2588         if (chain != NULL) {
2589                 if (chain->flags & NFT_CHAIN_BINDING)
2590                         return -EINVAL;
2591
2592                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2593                         NL_SET_BAD_ATTR(extack, attr);
2594                         return -EEXIST;
2595                 }
2596                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2597                         return -EOPNOTSUPP;
2598
2599                 flags |= chain->flags & NFT_CHAIN_BASE;
2600                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2601                                           extack);
2602         }
2603
2604         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2605 }
2606
2607 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2608                               const struct nlattr * const nla[])
2609 {
2610         struct netlink_ext_ack *extack = info->extack;
2611         u8 genmask = nft_genmask_next(info->net);
2612         u8 family = info->nfmsg->nfgen_family;
2613         struct net *net = info->net;
2614         const struct nlattr *attr;
2615         struct nft_table *table;
2616         struct nft_chain *chain;
2617         struct nft_rule *rule;
2618         struct nft_ctx ctx;
2619         u64 handle;
2620         u32 use;
2621         int err;
2622
2623         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2624                                  NETLINK_CB(skb).portid);
2625         if (IS_ERR(table)) {
2626                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2627                 return PTR_ERR(table);
2628         }
2629
2630         if (nla[NFTA_CHAIN_HANDLE]) {
2631                 attr = nla[NFTA_CHAIN_HANDLE];
2632                 handle = be64_to_cpu(nla_get_be64(attr));
2633                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2634         } else {
2635                 attr = nla[NFTA_CHAIN_NAME];
2636                 chain = nft_chain_lookup(net, table, attr, genmask);
2637         }
2638         if (IS_ERR(chain)) {
2639                 if (PTR_ERR(chain) == -ENOENT &&
2640                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2641                         return 0;
2642
2643                 NL_SET_BAD_ATTR(extack, attr);
2644                 return PTR_ERR(chain);
2645         }
2646
2647         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2648             chain->use > 0)
2649                 return -EBUSY;
2650
2651         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2652
2653         use = chain->use;
2654         list_for_each_entry(rule, &chain->rules, list) {
2655                 if (!nft_is_active_next(net, rule))
2656                         continue;
2657                 use--;
2658
2659                 err = nft_delrule(&ctx, rule);
2660                 if (err < 0)
2661                         return err;
2662         }
2663
2664         /* There are rules and elements that are still holding references to us,
2665          * we cannot do a recursive removal in this case.
2666          */
2667         if (use > 0) {
2668                 NL_SET_BAD_ATTR(extack, attr);
2669                 return -EBUSY;
2670         }
2671
2672         return nft_delchain(&ctx);
2673 }
2674
2675 /*
2676  * Expressions
2677  */
2678
2679 /**
2680  *      nft_register_expr - register nf_tables expr type
2681  *      @type: expr type
2682  *
2683  *      Registers the expr type for use with nf_tables. Returns zero on
2684  *      success or a negative errno code otherwise.
2685  */
2686 int nft_register_expr(struct nft_expr_type *type)
2687 {
2688         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2689         if (type->family == NFPROTO_UNSPEC)
2690                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2691         else
2692                 list_add_rcu(&type->list, &nf_tables_expressions);
2693         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2694         return 0;
2695 }
2696 EXPORT_SYMBOL_GPL(nft_register_expr);
2697
2698 /**
2699  *      nft_unregister_expr - unregister nf_tables expr type
2700  *      @type: expr type
2701  *
2702  *      Unregisters the expr typefor use with nf_tables.
2703  */
2704 void nft_unregister_expr(struct nft_expr_type *type)
2705 {
2706         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2707         list_del_rcu(&type->list);
2708         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2709 }
2710 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2711
2712 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2713                                                        struct nlattr *nla)
2714 {
2715         const struct nft_expr_type *type, *candidate = NULL;
2716
2717         list_for_each_entry(type, &nf_tables_expressions, list) {
2718                 if (!nla_strcmp(nla, type->name)) {
2719                         if (!type->family && !candidate)
2720                                 candidate = type;
2721                         else if (type->family == family)
2722                                 candidate = type;
2723                 }
2724         }
2725         return candidate;
2726 }
2727
2728 #ifdef CONFIG_MODULES
2729 static int nft_expr_type_request_module(struct net *net, u8 family,
2730                                         struct nlattr *nla)
2731 {
2732         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2733                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2734                 return -EAGAIN;
2735
2736         return 0;
2737 }
2738 #endif
2739
2740 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2741                                                      u8 family,
2742                                                      struct nlattr *nla)
2743 {
2744         const struct nft_expr_type *type;
2745
2746         if (nla == NULL)
2747                 return ERR_PTR(-EINVAL);
2748
2749         type = __nft_expr_type_get(family, nla);
2750         if (type != NULL && try_module_get(type->owner))
2751                 return type;
2752
2753         lockdep_nfnl_nft_mutex_not_held();
2754 #ifdef CONFIG_MODULES
2755         if (type == NULL) {
2756                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2757                         return ERR_PTR(-EAGAIN);
2758
2759                 if (nft_request_module(net, "nft-expr-%.*s",
2760                                        nla_len(nla),
2761                                        (char *)nla_data(nla)) == -EAGAIN)
2762                         return ERR_PTR(-EAGAIN);
2763         }
2764 #endif
2765         return ERR_PTR(-ENOENT);
2766 }
2767
2768 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2769         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2770                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2771         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2772 };
2773
2774 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2775                                     const struct nft_expr *expr, bool reset)
2776 {
2777         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2778                 goto nla_put_failure;
2779
2780         if (expr->ops->dump) {
2781                 struct nlattr *data = nla_nest_start_noflag(skb,
2782                                                             NFTA_EXPR_DATA);
2783                 if (data == NULL)
2784                         goto nla_put_failure;
2785                 if (expr->ops->dump(skb, expr, reset) < 0)
2786                         goto nla_put_failure;
2787                 nla_nest_end(skb, data);
2788         }
2789
2790         return skb->len;
2791
2792 nla_put_failure:
2793         return -1;
2794 };
2795
2796 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2797                   const struct nft_expr *expr, bool reset)
2798 {
2799         struct nlattr *nest;
2800
2801         nest = nla_nest_start_noflag(skb, attr);
2802         if (!nest)
2803                 goto nla_put_failure;
2804         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
2805                 goto nla_put_failure;
2806         nla_nest_end(skb, nest);
2807         return 0;
2808
2809 nla_put_failure:
2810         return -1;
2811 }
2812
2813 struct nft_expr_info {
2814         const struct nft_expr_ops       *ops;
2815         const struct nlattr             *attr;
2816         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2817 };
2818
2819 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2820                                 const struct nlattr *nla,
2821                                 struct nft_expr_info *info)
2822 {
2823         const struct nft_expr_type *type;
2824         const struct nft_expr_ops *ops;
2825         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2826         int err;
2827
2828         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2829                                           nft_expr_policy, NULL);
2830         if (err < 0)
2831                 return err;
2832
2833         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2834         if (IS_ERR(type))
2835                 return PTR_ERR(type);
2836
2837         if (tb[NFTA_EXPR_DATA]) {
2838                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2839                                                   tb[NFTA_EXPR_DATA],
2840                                                   type->policy, NULL);
2841                 if (err < 0)
2842                         goto err1;
2843         } else
2844                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2845
2846         if (type->select_ops != NULL) {
2847                 ops = type->select_ops(ctx,
2848                                        (const struct nlattr * const *)info->tb);
2849                 if (IS_ERR(ops)) {
2850                         err = PTR_ERR(ops);
2851 #ifdef CONFIG_MODULES
2852                         if (err == -EAGAIN)
2853                                 if (nft_expr_type_request_module(ctx->net,
2854                                                                  ctx->family,
2855                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2856                                         err = -ENOENT;
2857 #endif
2858                         goto err1;
2859                 }
2860         } else
2861                 ops = type->ops;
2862
2863         info->attr = nla;
2864         info->ops = ops;
2865
2866         return 0;
2867
2868 err1:
2869         module_put(type->owner);
2870         return err;
2871 }
2872
2873 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
2874                          struct nft_expr_info *info)
2875 {
2876         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2877         const struct nft_expr_type *type;
2878         int err;
2879
2880         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2881                                           nft_expr_policy, NULL);
2882         if (err < 0)
2883                 return err;
2884
2885         if (!tb[NFTA_EXPR_DATA])
2886                 return -EINVAL;
2887
2888         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
2889         if (!type)
2890                 return -ENOENT;
2891
2892         if (!type->inner_ops)
2893                 return -EOPNOTSUPP;
2894
2895         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2896                                           tb[NFTA_EXPR_DATA],
2897                                           type->policy, NULL);
2898         if (err < 0)
2899                 goto err_nla_parse;
2900
2901         info->attr = nla;
2902         info->ops = type->inner_ops;
2903
2904         return 0;
2905
2906 err_nla_parse:
2907         return err;
2908 }
2909
2910 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2911                              const struct nft_expr_info *expr_info,
2912                              struct nft_expr *expr)
2913 {
2914         const struct nft_expr_ops *ops = expr_info->ops;
2915         int err;
2916
2917         expr->ops = ops;
2918         if (ops->init) {
2919                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2920                 if (err < 0)
2921                         goto err1;
2922         }
2923
2924         return 0;
2925 err1:
2926         expr->ops = NULL;
2927         return err;
2928 }
2929
2930 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2931                                    struct nft_expr *expr)
2932 {
2933         const struct nft_expr_type *type = expr->ops->type;
2934
2935         if (expr->ops->destroy)
2936                 expr->ops->destroy(ctx, expr);
2937         module_put(type->owner);
2938 }
2939
2940 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2941                                       const struct nlattr *nla)
2942 {
2943         struct nft_expr_info expr_info;
2944         struct nft_expr *expr;
2945         struct module *owner;
2946         int err;
2947
2948         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2949         if (err < 0)
2950                 goto err_expr_parse;
2951
2952         err = -EOPNOTSUPP;
2953         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2954                 goto err_expr_stateful;
2955
2956         err = -ENOMEM;
2957         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
2958         if (expr == NULL)
2959                 goto err_expr_stateful;
2960
2961         err = nf_tables_newexpr(ctx, &expr_info, expr);
2962         if (err < 0)
2963                 goto err_expr_new;
2964
2965         return expr;
2966 err_expr_new:
2967         kfree(expr);
2968 err_expr_stateful:
2969         owner = expr_info.ops->type->owner;
2970         if (expr_info.ops->type->release_ops)
2971                 expr_info.ops->type->release_ops(expr_info.ops);
2972
2973         module_put(owner);
2974 err_expr_parse:
2975         return ERR_PTR(err);
2976 }
2977
2978 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2979 {
2980         int err;
2981
2982         if (src->ops->clone) {
2983                 dst->ops = src->ops;
2984                 err = src->ops->clone(dst, src);
2985                 if (err < 0)
2986                         return err;
2987         } else {
2988                 memcpy(dst, src, src->ops->size);
2989         }
2990
2991         __module_get(src->ops->type->owner);
2992
2993         return 0;
2994 }
2995
2996 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2997 {
2998         nf_tables_expr_destroy(ctx, expr);
2999         kfree(expr);
3000 }
3001
3002 /*
3003  * Rules
3004  */
3005
3006 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3007                                           u64 handle)
3008 {
3009         struct nft_rule *rule;
3010
3011         // FIXME: this sucks
3012         list_for_each_entry_rcu(rule, &chain->rules, list) {
3013                 if (handle == rule->handle)
3014                         return rule;
3015         }
3016
3017         return ERR_PTR(-ENOENT);
3018 }
3019
3020 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3021                                         const struct nlattr *nla)
3022 {
3023         if (nla == NULL)
3024                 return ERR_PTR(-EINVAL);
3025
3026         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3027 }
3028
3029 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3030         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3031                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3032         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3033                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3034         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3035         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3036         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3037         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3038         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3039                                     .len = NFT_USERDATA_MAXLEN },
3040         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3041         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3042         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3043 };
3044
3045 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3046                                     u32 portid, u32 seq, int event,
3047                                     u32 flags, int family,
3048                                     const struct nft_table *table,
3049                                     const struct nft_chain *chain,
3050                                     const struct nft_rule *rule, u64 handle,
3051                                     bool reset)
3052 {
3053         struct nlmsghdr *nlh;
3054         const struct nft_expr *expr, *next;
3055         struct nlattr *list;
3056         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3057
3058         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3059                            nft_base_seq(net));
3060         if (!nlh)
3061                 goto nla_put_failure;
3062
3063         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3064                 goto nla_put_failure;
3065         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3066                 goto nla_put_failure;
3067         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3068                          NFTA_RULE_PAD))
3069                 goto nla_put_failure;
3070
3071         if (event != NFT_MSG_DELRULE && handle) {
3072                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3073                                  NFTA_RULE_PAD))
3074                         goto nla_put_failure;
3075         }
3076
3077         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3078                 nft_flow_rule_stats(chain, rule);
3079
3080         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3081         if (list == NULL)
3082                 goto nla_put_failure;
3083         nft_rule_for_each_expr(expr, next, rule) {
3084                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3085                         goto nla_put_failure;
3086         }
3087         nla_nest_end(skb, list);
3088
3089         if (rule->udata) {
3090                 struct nft_userdata *udata = nft_userdata(rule);
3091                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3092                             udata->data) < 0)
3093                         goto nla_put_failure;
3094         }
3095
3096         nlmsg_end(skb, nlh);
3097         return 0;
3098
3099 nla_put_failure:
3100         nlmsg_trim(skb, nlh);
3101         return -1;
3102 }
3103
3104 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3105                                   const struct nft_rule *rule, int event)
3106 {
3107         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3108         const struct nft_rule *prule;
3109         struct sk_buff *skb;
3110         u64 handle = 0;
3111         u16 flags = 0;
3112         int err;
3113
3114         if (!ctx->report &&
3115             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3116                 return;
3117
3118         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3119         if (skb == NULL)
3120                 goto err;
3121
3122         if (event == NFT_MSG_NEWRULE &&
3123             !list_is_first(&rule->list, &ctx->chain->rules) &&
3124             !list_is_last(&rule->list, &ctx->chain->rules)) {
3125                 prule = list_prev_entry(rule, list);
3126                 handle = prule->handle;
3127         }
3128         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3129                 flags |= NLM_F_APPEND;
3130         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3131                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3132
3133         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3134                                        event, flags, ctx->family, ctx->table,
3135                                        ctx->chain, rule, handle, false);
3136         if (err < 0) {
3137                 kfree_skb(skb);
3138                 goto err;
3139         }
3140
3141         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3142         return;
3143 err:
3144         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3145 }
3146
3147 struct nft_rule_dump_ctx {
3148         char *table;
3149         char *chain;
3150 };
3151
3152 static int __nf_tables_dump_rules(struct sk_buff *skb,
3153                                   unsigned int *idx,
3154                                   struct netlink_callback *cb,
3155                                   const struct nft_table *table,
3156                                   const struct nft_chain *chain,
3157                                   bool reset)
3158 {
3159         struct net *net = sock_net(skb->sk);
3160         const struct nft_rule *rule, *prule;
3161         unsigned int s_idx = cb->args[0];
3162         u64 handle;
3163
3164         prule = NULL;
3165         list_for_each_entry_rcu(rule, &chain->rules, list) {
3166                 if (!nft_is_active(net, rule))
3167                         goto cont_skip;
3168                 if (*idx < s_idx)
3169                         goto cont;
3170                 if (*idx > s_idx) {
3171                         memset(&cb->args[1], 0,
3172                                         sizeof(cb->args) - sizeof(cb->args[0]));
3173                 }
3174                 if (prule)
3175                         handle = prule->handle;
3176                 else
3177                         handle = 0;
3178
3179                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3180                                         cb->nlh->nlmsg_seq,
3181                                         NFT_MSG_NEWRULE,
3182                                         NLM_F_MULTI | NLM_F_APPEND,
3183                                         table->family,
3184                                         table, chain, rule, handle, reset) < 0)
3185                         return 1;
3186
3187                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3188 cont:
3189                 prule = rule;
3190 cont_skip:
3191                 (*idx)++;
3192         }
3193         return 0;
3194 }
3195
3196 static int nf_tables_dump_rules(struct sk_buff *skb,
3197                                 struct netlink_callback *cb)
3198 {
3199         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3200         const struct nft_rule_dump_ctx *ctx = cb->data;
3201         struct nft_table *table;
3202         const struct nft_chain *chain;
3203         unsigned int idx = 0;
3204         struct net *net = sock_net(skb->sk);
3205         int family = nfmsg->nfgen_family;
3206         struct nftables_pernet *nft_net;
3207         bool reset = false;
3208
3209         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3210                 reset = true;
3211
3212         rcu_read_lock();
3213         nft_net = nft_pernet(net);
3214         cb->seq = READ_ONCE(nft_net->base_seq);
3215
3216         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3217                 if (family != NFPROTO_UNSPEC && family != table->family)
3218                         continue;
3219
3220                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3221                         continue;
3222
3223                 if (ctx && ctx->table && ctx->chain) {
3224                         struct rhlist_head *list, *tmp;
3225
3226                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3227                                                nft_chain_ht_params);
3228                         if (!list)
3229                                 goto done;
3230
3231                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3232                                 if (!nft_is_active(net, chain))
3233                                         continue;
3234                                 __nf_tables_dump_rules(skb, &idx,
3235                                                        cb, table, chain, reset);
3236                                 break;
3237                         }
3238                         goto done;
3239                 }
3240
3241                 list_for_each_entry_rcu(chain, &table->chains, list) {
3242                         if (__nf_tables_dump_rules(skb, &idx,
3243                                                    cb, table, chain, reset))
3244                                 goto done;
3245                 }
3246
3247                 if (ctx && ctx->table)
3248                         break;
3249         }
3250 done:
3251         rcu_read_unlock();
3252
3253         cb->args[0] = idx;
3254         return skb->len;
3255 }
3256
3257 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3258 {
3259         const struct nlattr * const *nla = cb->data;
3260         struct nft_rule_dump_ctx *ctx = NULL;
3261
3262         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3263                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3264                 if (!ctx)
3265                         return -ENOMEM;
3266
3267                 if (nla[NFTA_RULE_TABLE]) {
3268                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3269                                                         GFP_ATOMIC);
3270                         if (!ctx->table) {
3271                                 kfree(ctx);
3272                                 return -ENOMEM;
3273                         }
3274                 }
3275                 if (nla[NFTA_RULE_CHAIN]) {
3276                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3277                                                 GFP_ATOMIC);
3278                         if (!ctx->chain) {
3279                                 kfree(ctx->table);
3280                                 kfree(ctx);
3281                                 return -ENOMEM;
3282                         }
3283                 }
3284         }
3285
3286         cb->data = ctx;
3287         return 0;
3288 }
3289
3290 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3291 {
3292         struct nft_rule_dump_ctx *ctx = cb->data;
3293
3294         if (ctx) {
3295                 kfree(ctx->table);
3296                 kfree(ctx->chain);
3297                 kfree(ctx);
3298         }
3299         return 0;
3300 }
3301
3302 /* called with rcu_read_lock held */
3303 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3304                              const struct nlattr * const nla[])
3305 {
3306         struct netlink_ext_ack *extack = info->extack;
3307         u8 genmask = nft_genmask_cur(info->net);
3308         u8 family = info->nfmsg->nfgen_family;
3309         const struct nft_chain *chain;
3310         const struct nft_rule *rule;
3311         struct net *net = info->net;
3312         struct nft_table *table;
3313         struct sk_buff *skb2;
3314         bool reset = false;
3315         int err;
3316
3317         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3318                 struct netlink_dump_control c = {
3319                         .start= nf_tables_dump_rules_start,
3320                         .dump = nf_tables_dump_rules,
3321                         .done = nf_tables_dump_rules_done,
3322                         .module = THIS_MODULE,
3323                         .data = (void *)nla,
3324                 };
3325
3326                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3327         }
3328
3329         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3330         if (IS_ERR(table)) {
3331                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3332                 return PTR_ERR(table);
3333         }
3334
3335         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3336         if (IS_ERR(chain)) {
3337                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3338                 return PTR_ERR(chain);
3339         }
3340
3341         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3342         if (IS_ERR(rule)) {
3343                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3344                 return PTR_ERR(rule);
3345         }
3346
3347         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3348         if (!skb2)
3349                 return -ENOMEM;
3350
3351         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3352                 reset = true;
3353
3354         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3355                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3356                                        family, table, chain, rule, 0, reset);
3357         if (err < 0)
3358                 goto err_fill_rule_info;
3359
3360         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3361
3362 err_fill_rule_info:
3363         kfree_skb(skb2);
3364         return err;
3365 }
3366
3367 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3368                                    struct nft_rule *rule)
3369 {
3370         struct nft_expr *expr, *next;
3371
3372         /*
3373          * Careful: some expressions might not be initialized in case this
3374          * is called on error from nf_tables_newrule().
3375          */
3376         expr = nft_expr_first(rule);
3377         while (nft_expr_more(rule, expr)) {
3378                 next = nft_expr_next(expr);
3379                 nf_tables_expr_destroy(ctx, expr);
3380                 expr = next;
3381         }
3382         kfree(rule);
3383 }
3384
3385 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3386 {
3387         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3388         nf_tables_rule_destroy(ctx, rule);
3389 }
3390
3391 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3392 {
3393         struct nft_expr *expr, *last;
3394         const struct nft_data *data;
3395         struct nft_rule *rule;
3396         int err;
3397
3398         if (ctx->level == NFT_JUMP_STACK_SIZE)
3399                 return -EMLINK;
3400
3401         list_for_each_entry(rule, &chain->rules, list) {
3402                 if (!nft_is_active_next(ctx->net, rule))
3403                         continue;
3404
3405                 nft_rule_for_each_expr(expr, last, rule) {
3406                         if (!expr->ops->validate)
3407                                 continue;
3408
3409                         err = expr->ops->validate(ctx, expr, &data);
3410                         if (err < 0)
3411                                 return err;
3412                 }
3413
3414                 cond_resched();
3415         }
3416
3417         return 0;
3418 }
3419 EXPORT_SYMBOL_GPL(nft_chain_validate);
3420
3421 static int nft_table_validate(struct net *net, const struct nft_table *table)
3422 {
3423         struct nft_chain *chain;
3424         struct nft_ctx ctx = {
3425                 .net    = net,
3426                 .family = table->family,
3427         };
3428         int err;
3429
3430         list_for_each_entry(chain, &table->chains, list) {
3431                 if (!nft_is_base_chain(chain))
3432                         continue;
3433
3434                 ctx.chain = chain;
3435                 err = nft_chain_validate(&ctx, chain);
3436                 if (err < 0)
3437                         return err;
3438         }
3439
3440         return 0;
3441 }
3442
3443 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3444                          const struct nft_set_iter *iter,
3445                          struct nft_set_elem *elem)
3446 {
3447         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3448         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3449         const struct nft_data *data;
3450         int err;
3451
3452         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3453             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3454                 return 0;
3455
3456         data = nft_set_ext_data(ext);
3457         switch (data->verdict.code) {
3458         case NFT_JUMP:
3459         case NFT_GOTO:
3460                 pctx->level++;
3461                 err = nft_chain_validate(ctx, data->verdict.chain);
3462                 if (err < 0)
3463                         return err;
3464                 pctx->level--;
3465                 break;
3466         default:
3467                 break;
3468         }
3469
3470         return 0;
3471 }
3472
3473 struct nft_set_elem_catchall {
3474         struct list_head        list;
3475         struct rcu_head         rcu;
3476         void                    *elem;
3477 };
3478
3479 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3480 {
3481         u8 genmask = nft_genmask_next(ctx->net);
3482         struct nft_set_elem_catchall *catchall;
3483         struct nft_set_elem elem;
3484         struct nft_set_ext *ext;
3485         int ret = 0;
3486
3487         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3488                 ext = nft_set_elem_ext(set, catchall->elem);
3489                 if (!nft_set_elem_active(ext, genmask))
3490                         continue;
3491
3492                 elem.priv = catchall->elem;
3493                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3494                 if (ret < 0)
3495                         return ret;
3496         }
3497
3498         return ret;
3499 }
3500
3501 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3502                                              const struct nft_chain *chain,
3503                                              const struct nlattr *nla);
3504
3505 #define NFT_RULE_MAXEXPRS       128
3506
3507 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3508                              const struct nlattr * const nla[])
3509 {
3510         struct nftables_pernet *nft_net = nft_pernet(info->net);
3511         struct netlink_ext_ack *extack = info->extack;
3512         unsigned int size, i, n, ulen = 0, usize = 0;
3513         u8 genmask = nft_genmask_next(info->net);
3514         struct nft_rule *rule, *old_rule = NULL;
3515         struct nft_expr_info *expr_info = NULL;
3516         u8 family = info->nfmsg->nfgen_family;
3517         struct nft_flow_rule *flow = NULL;
3518         struct net *net = info->net;
3519         struct nft_userdata *udata;
3520         struct nft_table *table;
3521         struct nft_chain *chain;
3522         struct nft_trans *trans;
3523         u64 handle, pos_handle;
3524         struct nft_expr *expr;
3525         struct nft_ctx ctx;
3526         struct nlattr *tmp;
3527         int err, rem;
3528
3529         lockdep_assert_held(&nft_net->commit_mutex);
3530
3531         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3532                                  NETLINK_CB(skb).portid);
3533         if (IS_ERR(table)) {
3534                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3535                 return PTR_ERR(table);
3536         }
3537
3538         if (nla[NFTA_RULE_CHAIN]) {
3539                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3540                                          genmask);
3541                 if (IS_ERR(chain)) {
3542                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3543                         return PTR_ERR(chain);
3544                 }
3545                 if (nft_chain_is_bound(chain))
3546                         return -EOPNOTSUPP;
3547
3548         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3549                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3550                 if (IS_ERR(chain)) {
3551                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3552                         return PTR_ERR(chain);
3553                 }
3554         } else {
3555                 return -EINVAL;
3556         }
3557
3558         if (nla[NFTA_RULE_HANDLE]) {
3559                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3560                 rule = __nft_rule_lookup(chain, handle);
3561                 if (IS_ERR(rule)) {
3562                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3563                         return PTR_ERR(rule);
3564                 }
3565
3566                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3567                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3568                         return -EEXIST;
3569                 }
3570                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3571                         old_rule = rule;
3572                 else
3573                         return -EOPNOTSUPP;
3574         } else {
3575                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3576                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3577                         return -EINVAL;
3578                 handle = nf_tables_alloc_handle(table);
3579
3580                 if (chain->use == UINT_MAX)
3581                         return -EOVERFLOW;
3582
3583                 if (nla[NFTA_RULE_POSITION]) {
3584                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3585                         old_rule = __nft_rule_lookup(chain, pos_handle);
3586                         if (IS_ERR(old_rule)) {
3587                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3588                                 return PTR_ERR(old_rule);
3589                         }
3590                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3591                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3592                         if (IS_ERR(old_rule)) {
3593                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3594                                 return PTR_ERR(old_rule);
3595                         }
3596                 }
3597         }
3598
3599         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3600
3601         n = 0;
3602         size = 0;
3603         if (nla[NFTA_RULE_EXPRESSIONS]) {
3604                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3605                                            sizeof(struct nft_expr_info),
3606                                            GFP_KERNEL);
3607                 if (!expr_info)
3608                         return -ENOMEM;
3609
3610                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3611                         err = -EINVAL;
3612                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3613                                 goto err_release_expr;
3614                         if (n == NFT_RULE_MAXEXPRS)
3615                                 goto err_release_expr;
3616                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3617                         if (err < 0) {
3618                                 NL_SET_BAD_ATTR(extack, tmp);
3619                                 goto err_release_expr;
3620                         }
3621                         size += expr_info[n].ops->size;
3622                         n++;
3623                 }
3624         }
3625         /* Check for overflow of dlen field */
3626         err = -EFBIG;
3627         if (size >= 1 << 12)
3628                 goto err_release_expr;
3629
3630         if (nla[NFTA_RULE_USERDATA]) {
3631                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3632                 if (ulen > 0)
3633                         usize = sizeof(struct nft_userdata) + ulen;
3634         }
3635
3636         err = -ENOMEM;
3637         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3638         if (rule == NULL)
3639                 goto err_release_expr;
3640
3641         nft_activate_next(net, rule);
3642
3643         rule->handle = handle;
3644         rule->dlen   = size;
3645         rule->udata  = ulen ? 1 : 0;
3646
3647         if (ulen) {
3648                 udata = nft_userdata(rule);
3649                 udata->len = ulen - 1;
3650                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3651         }
3652
3653         expr = nft_expr_first(rule);
3654         for (i = 0; i < n; i++) {
3655                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3656                 if (err < 0) {
3657                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3658                         goto err_release_rule;
3659                 }
3660
3661                 if (expr_info[i].ops->validate)
3662                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
3663
3664                 expr_info[i].ops = NULL;
3665                 expr = nft_expr_next(expr);
3666         }
3667
3668         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3669                 flow = nft_flow_rule_create(net, rule);
3670                 if (IS_ERR(flow)) {
3671                         err = PTR_ERR(flow);
3672                         goto err_release_rule;
3673                 }
3674         }
3675
3676         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3677                 err = nft_delrule(&ctx, old_rule);
3678                 if (err < 0)
3679                         goto err_destroy_flow_rule;
3680
3681                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3682                 if (trans == NULL) {
3683                         err = -ENOMEM;
3684                         goto err_destroy_flow_rule;
3685                 }
3686                 list_add_tail_rcu(&rule->list, &old_rule->list);
3687         } else {
3688                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3689                 if (!trans) {
3690                         err = -ENOMEM;
3691                         goto err_destroy_flow_rule;
3692                 }
3693
3694                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3695                         if (old_rule)
3696                                 list_add_rcu(&rule->list, &old_rule->list);
3697                         else
3698                                 list_add_tail_rcu(&rule->list, &chain->rules);
3699                  } else {
3700                         if (old_rule)
3701                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3702                         else
3703                                 list_add_rcu(&rule->list, &chain->rules);
3704                 }
3705         }
3706         kvfree(expr_info);
3707         chain->use++;
3708
3709         if (flow)
3710                 nft_trans_flow_rule(trans) = flow;
3711
3712         if (table->validate_state == NFT_VALIDATE_DO)
3713                 return nft_table_validate(net, table);
3714
3715         return 0;
3716
3717 err_destroy_flow_rule:
3718         if (flow)
3719                 nft_flow_rule_destroy(flow);
3720 err_release_rule:
3721         nf_tables_rule_release(&ctx, rule);
3722 err_release_expr:
3723         for (i = 0; i < n; i++) {
3724                 if (expr_info[i].ops) {
3725                         module_put(expr_info[i].ops->type->owner);
3726                         if (expr_info[i].ops->type->release_ops)
3727                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3728                 }
3729         }
3730         kvfree(expr_info);
3731
3732         return err;
3733 }
3734
3735 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3736                                              const struct nft_chain *chain,
3737                                              const struct nlattr *nla)
3738 {
3739         struct nftables_pernet *nft_net = nft_pernet(net);
3740         u32 id = ntohl(nla_get_be32(nla));
3741         struct nft_trans *trans;
3742
3743         list_for_each_entry(trans, &nft_net->commit_list, list) {
3744                 struct nft_rule *rule = nft_trans_rule(trans);
3745
3746                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3747                     trans->ctx.chain == chain &&
3748                     id == nft_trans_rule_id(trans))
3749                         return rule;
3750         }
3751         return ERR_PTR(-ENOENT);
3752 }
3753
3754 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3755                              const struct nlattr * const nla[])
3756 {
3757         struct netlink_ext_ack *extack = info->extack;
3758         u8 genmask = nft_genmask_next(info->net);
3759         u8 family = info->nfmsg->nfgen_family;
3760         struct nft_chain *chain = NULL;
3761         struct net *net = info->net;
3762         struct nft_table *table;
3763         struct nft_rule *rule;
3764         struct nft_ctx ctx;
3765         int err = 0;
3766
3767         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3768                                  NETLINK_CB(skb).portid);
3769         if (IS_ERR(table)) {
3770                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3771                 return PTR_ERR(table);
3772         }
3773
3774         if (nla[NFTA_RULE_CHAIN]) {
3775                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3776                                          genmask);
3777                 if (IS_ERR(chain)) {
3778                         if (PTR_ERR(chain) == -ENOENT &&
3779                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3780                                 return 0;
3781
3782                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3783                         return PTR_ERR(chain);
3784                 }
3785                 if (nft_chain_is_bound(chain))
3786                         return -EOPNOTSUPP;
3787         }
3788
3789         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3790
3791         if (chain) {
3792                 if (nla[NFTA_RULE_HANDLE]) {
3793                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3794                         if (IS_ERR(rule)) {
3795                                 if (PTR_ERR(rule) == -ENOENT &&
3796                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3797                                         return 0;
3798
3799                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3800                                 return PTR_ERR(rule);
3801                         }
3802
3803                         err = nft_delrule(&ctx, rule);
3804                 } else if (nla[NFTA_RULE_ID]) {
3805                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3806                         if (IS_ERR(rule)) {
3807                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3808                                 return PTR_ERR(rule);
3809                         }
3810
3811                         err = nft_delrule(&ctx, rule);
3812                 } else {
3813                         err = nft_delrule_by_chain(&ctx);
3814                 }
3815         } else {
3816                 list_for_each_entry(chain, &table->chains, list) {
3817                         if (!nft_is_active_next(net, chain))
3818                                 continue;
3819
3820                         ctx.chain = chain;
3821                         err = nft_delrule_by_chain(&ctx);
3822                         if (err < 0)
3823                                 break;
3824                 }
3825         }
3826
3827         return err;
3828 }
3829
3830 /*
3831  * Sets
3832  */
3833 static const struct nft_set_type *nft_set_types[] = {
3834         &nft_set_hash_fast_type,
3835         &nft_set_hash_type,
3836         &nft_set_rhash_type,
3837         &nft_set_bitmap_type,
3838         &nft_set_rbtree_type,
3839 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3840         &nft_set_pipapo_avx2_type,
3841 #endif
3842         &nft_set_pipapo_type,
3843 };
3844
3845 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3846                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3847                                  NFT_SET_EVAL)
3848
3849 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3850 {
3851         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3852 }
3853
3854 /*
3855  * Select a set implementation based on the data characteristics and the
3856  * given policy. The total memory use might not be known if no size is
3857  * given, in that case the amount of memory per element is used.
3858  */
3859 static const struct nft_set_ops *
3860 nft_select_set_ops(const struct nft_ctx *ctx,
3861                    const struct nlattr * const nla[],
3862                    const struct nft_set_desc *desc)
3863 {
3864         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3865         const struct nft_set_ops *ops, *bops;
3866         struct nft_set_estimate est, best;
3867         const struct nft_set_type *type;
3868         u32 flags = 0;
3869         int i;
3870
3871         lockdep_assert_held(&nft_net->commit_mutex);
3872         lockdep_nfnl_nft_mutex_not_held();
3873
3874         if (nla[NFTA_SET_FLAGS] != NULL)
3875                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3876
3877         bops        = NULL;
3878         best.size   = ~0;
3879         best.lookup = ~0;
3880         best.space  = ~0;
3881
3882         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3883                 type = nft_set_types[i];
3884                 ops = &type->ops;
3885
3886                 if (!nft_set_ops_candidate(type, flags))
3887                         continue;
3888                 if (!ops->estimate(desc, flags, &est))
3889                         continue;
3890
3891                 switch (desc->policy) {
3892                 case NFT_SET_POL_PERFORMANCE:
3893                         if (est.lookup < best.lookup)
3894                                 break;
3895                         if (est.lookup == best.lookup &&
3896                             est.space < best.space)
3897                                 break;
3898                         continue;
3899                 case NFT_SET_POL_MEMORY:
3900                         if (!desc->size) {
3901                                 if (est.space < best.space)
3902                                         break;
3903                                 if (est.space == best.space &&
3904                                     est.lookup < best.lookup)
3905                                         break;
3906                         } else if (est.size < best.size || !bops) {
3907                                 break;
3908                         }
3909                         continue;
3910                 default:
3911                         break;
3912                 }
3913
3914                 bops = ops;
3915                 best = est;
3916         }
3917
3918         if (bops != NULL)
3919                 return bops;
3920
3921         return ERR_PTR(-EOPNOTSUPP);
3922 }
3923
3924 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3925         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3926                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3927         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3928                                             .len = NFT_SET_MAXNAMELEN - 1 },
3929         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3930         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3931         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3932         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3933         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3934         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3935         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3936         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3937         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3938         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3939         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3940                                             .len  = NFT_USERDATA_MAXLEN },
3941         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3942         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3943         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3944         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3945 };
3946
3947 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3948         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3949         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3950 };
3951
3952 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3953                                       const struct nlattr *nla, u8 genmask)
3954 {
3955         struct nft_set *set;
3956
3957         if (nla == NULL)
3958                 return ERR_PTR(-EINVAL);
3959
3960         list_for_each_entry_rcu(set, &table->sets, list) {
3961                 if (!nla_strcmp(nla, set->name) &&
3962                     nft_active_genmask(set, genmask))
3963                         return set;
3964         }
3965         return ERR_PTR(-ENOENT);
3966 }
3967
3968 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3969                                                const struct nlattr *nla,
3970                                                u8 genmask)
3971 {
3972         struct nft_set *set;
3973
3974         list_for_each_entry(set, &table->sets, list) {
3975                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3976                     nft_active_genmask(set, genmask))
3977                         return set;
3978         }
3979         return ERR_PTR(-ENOENT);
3980 }
3981
3982 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3983                                            const struct nft_table *table,
3984                                            const struct nlattr *nla, u8 genmask)
3985 {
3986         struct nftables_pernet *nft_net = nft_pernet(net);
3987         u32 id = ntohl(nla_get_be32(nla));
3988         struct nft_trans *trans;
3989
3990         list_for_each_entry(trans, &nft_net->commit_list, list) {
3991                 if (trans->msg_type == NFT_MSG_NEWSET) {
3992                         struct nft_set *set = nft_trans_set(trans);
3993
3994                         if (id == nft_trans_set_id(trans) &&
3995                             set->table == table &&
3996                             nft_active_genmask(set, genmask))
3997                                 return set;
3998                 }
3999         }
4000         return ERR_PTR(-ENOENT);
4001 }
4002
4003 struct nft_set *nft_set_lookup_global(const struct net *net,
4004                                       const struct nft_table *table,
4005                                       const struct nlattr *nla_set_name,
4006                                       const struct nlattr *nla_set_id,
4007                                       u8 genmask)
4008 {
4009         struct nft_set *set;
4010
4011         set = nft_set_lookup(table, nla_set_name, genmask);
4012         if (IS_ERR(set)) {
4013                 if (!nla_set_id)
4014                         return set;
4015
4016                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4017         }
4018         return set;
4019 }
4020 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4021
4022 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4023                                     const char *name)
4024 {
4025         const struct nft_set *i;
4026         const char *p;
4027         unsigned long *inuse;
4028         unsigned int n = 0, min = 0;
4029
4030         p = strchr(name, '%');
4031         if (p != NULL) {
4032                 if (p[1] != 'd' || strchr(p + 2, '%'))
4033                         return -EINVAL;
4034
4035                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4036                 if (inuse == NULL)
4037                         return -ENOMEM;
4038 cont:
4039                 list_for_each_entry(i, &ctx->table->sets, list) {
4040                         int tmp;
4041
4042                         if (!nft_is_active_next(ctx->net, i))
4043                                 continue;
4044                         if (!sscanf(i->name, name, &tmp))
4045                                 continue;
4046                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4047                                 continue;
4048
4049                         set_bit(tmp - min, inuse);
4050                 }
4051
4052                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4053                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4054                         min += BITS_PER_BYTE * PAGE_SIZE;
4055                         memset(inuse, 0, PAGE_SIZE);
4056                         goto cont;
4057                 }
4058                 free_page((unsigned long)inuse);
4059         }
4060
4061         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4062         if (!set->name)
4063                 return -ENOMEM;
4064
4065         list_for_each_entry(i, &ctx->table->sets, list) {
4066                 if (!nft_is_active_next(ctx->net, i))
4067                         continue;
4068                 if (!strcmp(set->name, i->name)) {
4069                         kfree(set->name);
4070                         set->name = NULL;
4071                         return -ENFILE;
4072                 }
4073         }
4074         return 0;
4075 }
4076
4077 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4078 {
4079         u64 ms = be64_to_cpu(nla_get_be64(nla));
4080         u64 max = (u64)(~((u64)0));
4081
4082         max = div_u64(max, NSEC_PER_MSEC);
4083         if (ms >= max)
4084                 return -ERANGE;
4085
4086         ms *= NSEC_PER_MSEC;
4087         *result = nsecs_to_jiffies64(ms);
4088         return 0;
4089 }
4090
4091 __be64 nf_jiffies64_to_msecs(u64 input)
4092 {
4093         return cpu_to_be64(jiffies64_to_msecs(input));
4094 }
4095
4096 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4097                                      const struct nft_set *set)
4098 {
4099         struct nlattr *concat, *field;
4100         int i;
4101
4102         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4103         if (!concat)
4104                 return -ENOMEM;
4105
4106         for (i = 0; i < set->field_count; i++) {
4107                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4108                 if (!field)
4109                         return -ENOMEM;
4110
4111                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4112                                  htonl(set->field_len[i])))
4113                         return -ENOMEM;
4114
4115                 nla_nest_end(skb, field);
4116         }
4117
4118         nla_nest_end(skb, concat);
4119
4120         return 0;
4121 }
4122
4123 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4124                               const struct nft_set *set, u16 event, u16 flags)
4125 {
4126         u64 timeout = READ_ONCE(set->timeout);
4127         u32 gc_int = READ_ONCE(set->gc_int);
4128         u32 portid = ctx->portid;
4129         struct nlmsghdr *nlh;
4130         struct nlattr *nest;
4131         u32 seq = ctx->seq;
4132         int i;
4133
4134         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4135         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4136                            NFNETLINK_V0, nft_base_seq(ctx->net));
4137         if (!nlh)
4138                 goto nla_put_failure;
4139
4140         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4141                 goto nla_put_failure;
4142         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4143                 goto nla_put_failure;
4144         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4145                          NFTA_SET_PAD))
4146                 goto nla_put_failure;
4147         if (set->flags != 0)
4148                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4149                         goto nla_put_failure;
4150
4151         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4152                 goto nla_put_failure;
4153         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4154                 goto nla_put_failure;
4155         if (set->flags & NFT_SET_MAP) {
4156                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4157                         goto nla_put_failure;
4158                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4159                         goto nla_put_failure;
4160         }
4161         if (set->flags & NFT_SET_OBJECT &&
4162             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4163                 goto nla_put_failure;
4164
4165         if (timeout &&
4166             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4167                          nf_jiffies64_to_msecs(timeout),
4168                          NFTA_SET_PAD))
4169                 goto nla_put_failure;
4170         if (gc_int &&
4171             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4172                 goto nla_put_failure;
4173
4174         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4175                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4176                         goto nla_put_failure;
4177         }
4178
4179         if (set->udata &&
4180             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4181                 goto nla_put_failure;
4182
4183         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4184         if (!nest)
4185                 goto nla_put_failure;
4186         if (set->size &&
4187             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4188                 goto nla_put_failure;
4189
4190         if (set->field_count > 1 &&
4191             nf_tables_fill_set_concat(skb, set))
4192                 goto nla_put_failure;
4193
4194         nla_nest_end(skb, nest);
4195
4196         if (set->num_exprs == 1) {
4197                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4198                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4199                         goto nla_put_failure;
4200
4201                 nla_nest_end(skb, nest);
4202         } else if (set->num_exprs > 1) {
4203                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4204                 if (nest == NULL)
4205                         goto nla_put_failure;
4206
4207                 for (i = 0; i < set->num_exprs; i++) {
4208                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4209                                           set->exprs[i], false) < 0)
4210                                 goto nla_put_failure;
4211                 }
4212                 nla_nest_end(skb, nest);
4213         }
4214
4215         nlmsg_end(skb, nlh);
4216         return 0;
4217
4218 nla_put_failure:
4219         nlmsg_trim(skb, nlh);
4220         return -1;
4221 }
4222
4223 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4224                                  const struct nft_set *set, int event,
4225                                  gfp_t gfp_flags)
4226 {
4227         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4228         u32 portid = ctx->portid;
4229         struct sk_buff *skb;
4230         u16 flags = 0;
4231         int err;
4232
4233         if (!ctx->report &&
4234             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4235                 return;
4236
4237         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4238         if (skb == NULL)
4239                 goto err;
4240
4241         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4242                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4243
4244         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4245         if (err < 0) {
4246                 kfree_skb(skb);
4247                 goto err;
4248         }
4249
4250         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4251         return;
4252 err:
4253         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4254 }
4255
4256 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4257 {
4258         const struct nft_set *set;
4259         unsigned int idx, s_idx = cb->args[0];
4260         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4261         struct net *net = sock_net(skb->sk);
4262         struct nft_ctx *ctx = cb->data, ctx_set;
4263         struct nftables_pernet *nft_net;
4264
4265         if (cb->args[1])
4266                 return skb->len;
4267
4268         rcu_read_lock();
4269         nft_net = nft_pernet(net);
4270         cb->seq = READ_ONCE(nft_net->base_seq);
4271
4272         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4273                 if (ctx->family != NFPROTO_UNSPEC &&
4274                     ctx->family != table->family)
4275                         continue;
4276
4277                 if (ctx->table && ctx->table != table)
4278                         continue;
4279
4280                 if (cur_table) {
4281                         if (cur_table != table)
4282                                 continue;
4283
4284                         cur_table = NULL;
4285                 }
4286                 idx = 0;
4287                 list_for_each_entry_rcu(set, &table->sets, list) {
4288                         if (idx < s_idx)
4289                                 goto cont;
4290                         if (!nft_is_active(net, set))
4291                                 goto cont;
4292
4293                         ctx_set = *ctx;
4294                         ctx_set.table = table;
4295                         ctx_set.family = table->family;
4296
4297                         if (nf_tables_fill_set(skb, &ctx_set, set,
4298                                                NFT_MSG_NEWSET,
4299                                                NLM_F_MULTI) < 0) {
4300                                 cb->args[0] = idx;
4301                                 cb->args[2] = (unsigned long) table;
4302                                 goto done;
4303                         }
4304                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4305 cont:
4306                         idx++;
4307                 }
4308                 if (s_idx)
4309                         s_idx = 0;
4310         }
4311         cb->args[1] = 1;
4312 done:
4313         rcu_read_unlock();
4314         return skb->len;
4315 }
4316
4317 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4318 {
4319         struct nft_ctx *ctx_dump = NULL;
4320
4321         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4322         if (ctx_dump == NULL)
4323                 return -ENOMEM;
4324
4325         cb->data = ctx_dump;
4326         return 0;
4327 }
4328
4329 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4330 {
4331         kfree(cb->data);
4332         return 0;
4333 }
4334
4335 /* called with rcu_read_lock held */
4336 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4337                             const struct nlattr * const nla[])
4338 {
4339         struct netlink_ext_ack *extack = info->extack;
4340         u8 genmask = nft_genmask_cur(info->net);
4341         u8 family = info->nfmsg->nfgen_family;
4342         struct nft_table *table = NULL;
4343         struct net *net = info->net;
4344         const struct nft_set *set;
4345         struct sk_buff *skb2;
4346         struct nft_ctx ctx;
4347         int err;
4348
4349         if (nla[NFTA_SET_TABLE]) {
4350                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4351                                          genmask, 0);
4352                 if (IS_ERR(table)) {
4353                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4354                         return PTR_ERR(table);
4355                 }
4356         }
4357
4358         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4359
4360         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4361                 struct netlink_dump_control c = {
4362                         .start = nf_tables_dump_sets_start,
4363                         .dump = nf_tables_dump_sets,
4364                         .done = nf_tables_dump_sets_done,
4365                         .data = &ctx,
4366                         .module = THIS_MODULE,
4367                 };
4368
4369                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4370         }
4371
4372         /* Only accept unspec with dump */
4373         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4374                 return -EAFNOSUPPORT;
4375         if (!nla[NFTA_SET_TABLE])
4376                 return -EINVAL;
4377
4378         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4379         if (IS_ERR(set))
4380                 return PTR_ERR(set);
4381
4382         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4383         if (skb2 == NULL)
4384                 return -ENOMEM;
4385
4386         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4387         if (err < 0)
4388                 goto err_fill_set_info;
4389
4390         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4391
4392 err_fill_set_info:
4393         kfree_skb(skb2);
4394         return err;
4395 }
4396
4397 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4398         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4399 };
4400
4401 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4402                                      struct nft_set_desc *desc)
4403 {
4404         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4405         u32 len;
4406         int err;
4407
4408         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4409                 return -E2BIG;
4410
4411         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4412                                           nft_concat_policy, NULL);
4413         if (err < 0)
4414                 return err;
4415
4416         if (!tb[NFTA_SET_FIELD_LEN])
4417                 return -EINVAL;
4418
4419         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4420         if (!len || len > U8_MAX)
4421                 return -EINVAL;
4422
4423         desc->field_len[desc->field_count++] = len;
4424
4425         return 0;
4426 }
4427
4428 static int nft_set_desc_concat(struct nft_set_desc *desc,
4429                                const struct nlattr *nla)
4430 {
4431         struct nlattr *attr;
4432         u32 num_regs = 0;
4433         int rem, err, i;
4434
4435         nla_for_each_nested(attr, nla, rem) {
4436                 if (nla_type(attr) != NFTA_LIST_ELEM)
4437                         return -EINVAL;
4438
4439                 err = nft_set_desc_concat_parse(attr, desc);
4440                 if (err < 0)
4441                         return err;
4442         }
4443
4444         for (i = 0; i < desc->field_count; i++)
4445                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4446
4447         if (num_regs > NFT_REG32_COUNT)
4448                 return -E2BIG;
4449
4450         return 0;
4451 }
4452
4453 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4454                                     const struct nlattr *nla)
4455 {
4456         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4457         int err;
4458
4459         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4460                                           nft_set_desc_policy, NULL);
4461         if (err < 0)
4462                 return err;
4463
4464         if (da[NFTA_SET_DESC_SIZE] != NULL)
4465                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4466         if (da[NFTA_SET_DESC_CONCAT])
4467                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4468
4469         return err;
4470 }
4471
4472 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4473                               const struct nlattr * const *nla,
4474                               struct nft_expr **exprs, int *num_exprs,
4475                               u32 flags)
4476 {
4477         struct nft_expr *expr;
4478         int err, i;
4479
4480         if (nla[NFTA_SET_EXPR]) {
4481                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4482                 if (IS_ERR(expr)) {
4483                         err = PTR_ERR(expr);
4484                         goto err_set_expr_alloc;
4485                 }
4486                 exprs[0] = expr;
4487                 (*num_exprs)++;
4488         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4489                 struct nlattr *tmp;
4490                 int left;
4491
4492                 if (!(flags & NFT_SET_EXPR)) {
4493                         err = -EINVAL;
4494                         goto err_set_expr_alloc;
4495                 }
4496                 i = 0;
4497                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4498                         if (i == NFT_SET_EXPR_MAX) {
4499                                 err = -E2BIG;
4500                                 goto err_set_expr_alloc;
4501                         }
4502                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4503                                 err = -EINVAL;
4504                                 goto err_set_expr_alloc;
4505                         }
4506                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4507                         if (IS_ERR(expr)) {
4508                                 err = PTR_ERR(expr);
4509                                 goto err_set_expr_alloc;
4510                         }
4511                         exprs[i++] = expr;
4512                         (*num_exprs)++;
4513                 }
4514         }
4515
4516         return 0;
4517
4518 err_set_expr_alloc:
4519         for (i = 0; i < *num_exprs; i++)
4520                 nft_expr_destroy(ctx, exprs[i]);
4521
4522         return err;
4523 }
4524
4525 static bool nft_set_is_same(const struct nft_set *set,
4526                             const struct nft_set_desc *desc,
4527                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4528 {
4529         int i;
4530
4531         if (set->ktype != desc->ktype ||
4532             set->dtype != desc->dtype ||
4533             set->flags != flags ||
4534             set->klen != desc->klen ||
4535             set->dlen != desc->dlen ||
4536             set->field_count != desc->field_count ||
4537             set->num_exprs != num_exprs)
4538                 return false;
4539
4540         for (i = 0; i < desc->field_count; i++) {
4541                 if (set->field_len[i] != desc->field_len[i])
4542                         return false;
4543         }
4544
4545         for (i = 0; i < num_exprs; i++) {
4546                 if (set->exprs[i]->ops != exprs[i]->ops)
4547                         return false;
4548         }
4549
4550         return true;
4551 }
4552
4553 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4554                             const struct nlattr * const nla[])
4555 {
4556         struct netlink_ext_ack *extack = info->extack;
4557         u8 genmask = nft_genmask_next(info->net);
4558         u8 family = info->nfmsg->nfgen_family;
4559         const struct nft_set_ops *ops;
4560         struct net *net = info->net;
4561         struct nft_set_desc desc;
4562         struct nft_table *table;
4563         unsigned char *udata;
4564         struct nft_set *set;
4565         struct nft_ctx ctx;
4566         size_t alloc_size;
4567         int num_exprs = 0;
4568         char *name;
4569         int err, i;
4570         u16 udlen;
4571         u32 flags;
4572         u64 size;
4573
4574         if (nla[NFTA_SET_TABLE] == NULL ||
4575             nla[NFTA_SET_NAME] == NULL ||
4576             nla[NFTA_SET_KEY_LEN] == NULL ||
4577             nla[NFTA_SET_ID] == NULL)
4578                 return -EINVAL;
4579
4580         memset(&desc, 0, sizeof(desc));
4581
4582         desc.ktype = NFT_DATA_VALUE;
4583         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4584                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4585                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4586                         return -EINVAL;
4587         }
4588
4589         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4590         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4591                 return -EINVAL;
4592
4593         flags = 0;
4594         if (nla[NFTA_SET_FLAGS] != NULL) {
4595                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4596                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4597                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4598                               NFT_SET_MAP | NFT_SET_EVAL |
4599                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4600                         return -EOPNOTSUPP;
4601                 /* Only one of these operations is supported */
4602                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4603                              (NFT_SET_MAP | NFT_SET_OBJECT))
4604                         return -EOPNOTSUPP;
4605                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4606                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4607                         return -EOPNOTSUPP;
4608         }
4609
4610         desc.dtype = 0;
4611         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4612                 if (!(flags & NFT_SET_MAP))
4613                         return -EINVAL;
4614
4615                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4616                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4617                     desc.dtype != NFT_DATA_VERDICT)
4618                         return -EINVAL;
4619
4620                 if (desc.dtype != NFT_DATA_VERDICT) {
4621                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4622                                 return -EINVAL;
4623                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4624                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4625                                 return -EINVAL;
4626                 } else
4627                         desc.dlen = sizeof(struct nft_verdict);
4628         } else if (flags & NFT_SET_MAP)
4629                 return -EINVAL;
4630
4631         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4632                 if (!(flags & NFT_SET_OBJECT))
4633                         return -EINVAL;
4634
4635                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4636                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4637                     desc.objtype > NFT_OBJECT_MAX)
4638                         return -EOPNOTSUPP;
4639         } else if (flags & NFT_SET_OBJECT)
4640                 return -EINVAL;
4641         else
4642                 desc.objtype = NFT_OBJECT_UNSPEC;
4643
4644         desc.timeout = 0;
4645         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4646                 if (!(flags & NFT_SET_TIMEOUT))
4647                         return -EINVAL;
4648
4649                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4650                 if (err)
4651                         return err;
4652         }
4653         desc.gc_int = 0;
4654         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4655                 if (!(flags & NFT_SET_TIMEOUT))
4656                         return -EINVAL;
4657                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4658         }
4659
4660         desc.policy = NFT_SET_POL_PERFORMANCE;
4661         if (nla[NFTA_SET_POLICY] != NULL)
4662                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4663
4664         if (nla[NFTA_SET_DESC] != NULL) {
4665                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4666                 if (err < 0)
4667                         return err;
4668
4669                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4670                         return -EINVAL;
4671         } else if (flags & NFT_SET_CONCAT) {
4672                 return -EINVAL;
4673         }
4674
4675         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4676                 desc.expr = true;
4677
4678         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4679                                  NETLINK_CB(skb).portid);
4680         if (IS_ERR(table)) {
4681                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4682                 return PTR_ERR(table);
4683         }
4684
4685         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4686
4687         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4688         if (IS_ERR(set)) {
4689                 if (PTR_ERR(set) != -ENOENT) {
4690                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4691                         return PTR_ERR(set);
4692                 }
4693         } else {
4694                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4695
4696                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4697                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4698                         return -EEXIST;
4699                 }
4700                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4701                         return -EOPNOTSUPP;
4702
4703                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4704                 if (err < 0)
4705                         return err;
4706
4707                 err = 0;
4708                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4709                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4710                         err = -EEXIST;
4711                 }
4712
4713                 for (i = 0; i < num_exprs; i++)
4714                         nft_expr_destroy(&ctx, exprs[i]);
4715
4716                 if (err < 0)
4717                         return err;
4718
4719                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4720         }
4721
4722         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4723                 return -ENOENT;
4724
4725         ops = nft_select_set_ops(&ctx, nla, &desc);
4726         if (IS_ERR(ops))
4727                 return PTR_ERR(ops);
4728
4729         udlen = 0;
4730         if (nla[NFTA_SET_USERDATA])
4731                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4732
4733         size = 0;
4734         if (ops->privsize != NULL)
4735                 size = ops->privsize(nla, &desc);
4736         alloc_size = sizeof(*set) + size + udlen;
4737         if (alloc_size < size || alloc_size > INT_MAX)
4738                 return -ENOMEM;
4739         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4740         if (!set)
4741                 return -ENOMEM;
4742
4743         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4744         if (!name) {
4745                 err = -ENOMEM;
4746                 goto err_set_name;
4747         }
4748
4749         err = nf_tables_set_alloc_name(&ctx, set, name);
4750         kfree(name);
4751         if (err < 0)
4752                 goto err_set_name;
4753
4754         udata = NULL;
4755         if (udlen) {
4756                 udata = set->data + size;
4757                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4758         }
4759
4760         INIT_LIST_HEAD(&set->bindings);
4761         INIT_LIST_HEAD(&set->catchall_list);
4762         set->table = table;
4763         write_pnet(&set->net, net);
4764         set->ops = ops;
4765         set->ktype = desc.ktype;
4766         set->klen = desc.klen;
4767         set->dtype = desc.dtype;
4768         set->objtype = desc.objtype;
4769         set->dlen = desc.dlen;
4770         set->flags = flags;
4771         set->size = desc.size;
4772         set->policy = desc.policy;
4773         set->udlen = udlen;
4774         set->udata = udata;
4775         set->timeout = desc.timeout;
4776         set->gc_int = desc.gc_int;
4777
4778         set->field_count = desc.field_count;
4779         for (i = 0; i < desc.field_count; i++)
4780                 set->field_len[i] = desc.field_len[i];
4781
4782         err = ops->init(set, &desc, nla);
4783         if (err < 0)
4784                 goto err_set_init;
4785
4786         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4787         if (err < 0)
4788                 goto err_set_destroy;
4789
4790         set->num_exprs = num_exprs;
4791         set->handle = nf_tables_alloc_handle(table);
4792
4793         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4794         if (err < 0)
4795                 goto err_set_expr_alloc;
4796
4797         list_add_tail_rcu(&set->list, &table->sets);
4798         table->use++;
4799         return 0;
4800
4801 err_set_expr_alloc:
4802         for (i = 0; i < set->num_exprs; i++)
4803                 nft_expr_destroy(&ctx, set->exprs[i]);
4804 err_set_destroy:
4805         ops->destroy(set);
4806 err_set_init:
4807         kfree(set->name);
4808 err_set_name:
4809         kvfree(set);
4810         return err;
4811 }
4812
4813 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4814                                      struct nft_set *set)
4815 {
4816         struct nft_set_elem_catchall *next, *catchall;
4817
4818         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4819                 list_del_rcu(&catchall->list);
4820                 nft_set_elem_destroy(set, catchall->elem, true);
4821                 kfree_rcu(catchall, rcu);
4822         }
4823 }
4824
4825 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4826 {
4827         int i;
4828
4829         if (WARN_ON(set->use > 0))
4830                 return;
4831
4832         for (i = 0; i < set->num_exprs; i++)
4833                 nft_expr_destroy(ctx, set->exprs[i]);
4834
4835         set->ops->destroy(set);
4836         nft_set_catchall_destroy(ctx, set);
4837         kfree(set->name);
4838         kvfree(set);
4839 }
4840
4841 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4842                             const struct nlattr * const nla[])
4843 {
4844         struct netlink_ext_ack *extack = info->extack;
4845         u8 genmask = nft_genmask_next(info->net);
4846         u8 family = info->nfmsg->nfgen_family;
4847         struct net *net = info->net;
4848         const struct nlattr *attr;
4849         struct nft_table *table;
4850         struct nft_set *set;
4851         struct nft_ctx ctx;
4852
4853         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4854                 return -EAFNOSUPPORT;
4855
4856         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4857                                  genmask, NETLINK_CB(skb).portid);
4858         if (IS_ERR(table)) {
4859                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4860                 return PTR_ERR(table);
4861         }
4862
4863         if (nla[NFTA_SET_HANDLE]) {
4864                 attr = nla[NFTA_SET_HANDLE];
4865                 set = nft_set_lookup_byhandle(table, attr, genmask);
4866         } else {
4867                 attr = nla[NFTA_SET_NAME];
4868                 set = nft_set_lookup(table, attr, genmask);
4869         }
4870
4871         if (IS_ERR(set)) {
4872                 if (PTR_ERR(set) == -ENOENT &&
4873                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
4874                         return 0;
4875
4876                 NL_SET_BAD_ATTR(extack, attr);
4877                 return PTR_ERR(set);
4878         }
4879         if (set->use ||
4880             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4881              atomic_read(&set->nelems) > 0)) {
4882                 NL_SET_BAD_ATTR(extack, attr);
4883                 return -EBUSY;
4884         }
4885
4886         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4887
4888         return nft_delset(&ctx, set);
4889 }
4890
4891 static int nft_validate_register_store(const struct nft_ctx *ctx,
4892                                        enum nft_registers reg,
4893                                        const struct nft_data *data,
4894                                        enum nft_data_types type,
4895                                        unsigned int len);
4896
4897 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4898                                      struct nft_set *set,
4899                                      struct nft_set_elem *elem)
4900 {
4901         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4902         enum nft_registers dreg;
4903
4904         dreg = nft_type_to_reg(set->dtype);
4905         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4906                                            set->dtype == NFT_DATA_VERDICT ?
4907                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4908                                            set->dlen);
4909 }
4910
4911 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4912                                         struct nft_set *set,
4913                                         const struct nft_set_iter *iter,
4914                                         struct nft_set_elem *elem)
4915 {
4916         return nft_setelem_data_validate(ctx, set, elem);
4917 }
4918
4919 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4920                                        struct nft_set *set)
4921 {
4922         u8 genmask = nft_genmask_next(ctx->net);
4923         struct nft_set_elem_catchall *catchall;
4924         struct nft_set_elem elem;
4925         struct nft_set_ext *ext;
4926         int ret = 0;
4927
4928         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4929                 ext = nft_set_elem_ext(set, catchall->elem);
4930                 if (!nft_set_elem_active(ext, genmask))
4931                         continue;
4932
4933                 elem.priv = catchall->elem;
4934                 ret = nft_setelem_data_validate(ctx, set, &elem);
4935                 if (ret < 0)
4936                         break;
4937         }
4938
4939         return ret;
4940 }
4941
4942 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4943                        struct nft_set_binding *binding)
4944 {
4945         struct nft_set_binding *i;
4946         struct nft_set_iter iter;
4947
4948         if (set->use == UINT_MAX)
4949                 return -EOVERFLOW;
4950
4951         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4952                 return -EBUSY;
4953
4954         if (binding->flags & NFT_SET_MAP) {
4955                 /* If the set is already bound to the same chain all
4956                  * jumps are already validated for that chain.
4957                  */
4958                 list_for_each_entry(i, &set->bindings, list) {
4959                         if (i->flags & NFT_SET_MAP &&
4960                             i->chain == binding->chain)
4961                                 goto bind;
4962                 }
4963
4964                 iter.genmask    = nft_genmask_next(ctx->net);
4965                 iter.skip       = 0;
4966                 iter.count      = 0;
4967                 iter.err        = 0;
4968                 iter.fn         = nf_tables_bind_check_setelem;
4969
4970                 set->ops->walk(ctx, set, &iter);
4971                 if (!iter.err)
4972                         iter.err = nft_set_catchall_bind_check(ctx, set);
4973
4974                 if (iter.err < 0)
4975                         return iter.err;
4976         }
4977 bind:
4978         binding->chain = ctx->chain;
4979         list_add_tail_rcu(&binding->list, &set->bindings);
4980         nft_set_trans_bind(ctx, set);
4981         set->use++;
4982
4983         return 0;
4984 }
4985 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4986
4987 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4988                                  struct nft_set_binding *binding, bool event)
4989 {
4990         list_del_rcu(&binding->list);
4991
4992         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4993                 list_del_rcu(&set->list);
4994                 if (event)
4995                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4996                                              GFP_KERNEL);
4997         }
4998 }
4999
5000 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5001                               struct nft_set_binding *binding,
5002                               enum nft_trans_phase phase)
5003 {
5004         switch (phase) {
5005         case NFT_TRANS_PREPARE:
5006                 set->use--;
5007                 return;
5008         case NFT_TRANS_ABORT:
5009         case NFT_TRANS_RELEASE:
5010                 set->use--;
5011                 fallthrough;
5012         default:
5013                 nf_tables_unbind_set(ctx, set, binding,
5014                                      phase == NFT_TRANS_COMMIT);
5015         }
5016 }
5017 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5018
5019 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5020 {
5021         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5022                 nft_set_destroy(ctx, set);
5023 }
5024 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5025
5026 const struct nft_set_ext_type nft_set_ext_types[] = {
5027         [NFT_SET_EXT_KEY]               = {
5028                 .align  = __alignof__(u32),
5029         },
5030         [NFT_SET_EXT_DATA]              = {
5031                 .align  = __alignof__(u32),
5032         },
5033         [NFT_SET_EXT_EXPRESSIONS]       = {
5034                 .align  = __alignof__(struct nft_set_elem_expr),
5035         },
5036         [NFT_SET_EXT_OBJREF]            = {
5037                 .len    = sizeof(struct nft_object *),
5038                 .align  = __alignof__(struct nft_object *),
5039         },
5040         [NFT_SET_EXT_FLAGS]             = {
5041                 .len    = sizeof(u8),
5042                 .align  = __alignof__(u8),
5043         },
5044         [NFT_SET_EXT_TIMEOUT]           = {
5045                 .len    = sizeof(u64),
5046                 .align  = __alignof__(u64),
5047         },
5048         [NFT_SET_EXT_EXPIRATION]        = {
5049                 .len    = sizeof(u64),
5050                 .align  = __alignof__(u64),
5051         },
5052         [NFT_SET_EXT_USERDATA]          = {
5053                 .len    = sizeof(struct nft_userdata),
5054                 .align  = __alignof__(struct nft_userdata),
5055         },
5056         [NFT_SET_EXT_KEY_END]           = {
5057                 .align  = __alignof__(u32),
5058         },
5059 };
5060
5061 /*
5062  * Set elements
5063  */
5064
5065 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5066         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5067         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5068         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5069         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5070         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5071         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5072                                             .len = NFT_USERDATA_MAXLEN },
5073         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5074         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5075                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5076         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5077         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5078 };
5079
5080 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5081         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5082                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5083         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5084                                             .len = NFT_SET_MAXNAMELEN - 1 },
5085         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5086         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5087 };
5088
5089 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5090                                   const struct nft_set *set,
5091                                   const struct nft_set_ext *ext)
5092 {
5093         struct nft_set_elem_expr *elem_expr;
5094         u32 size, num_exprs = 0;
5095         struct nft_expr *expr;
5096         struct nlattr *nest;
5097
5098         elem_expr = nft_set_ext_expr(ext);
5099         nft_setelem_expr_foreach(expr, elem_expr, size)
5100                 num_exprs++;
5101
5102         if (num_exprs == 1) {
5103                 expr = nft_setelem_expr_at(elem_expr, 0);
5104                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, false) < 0)
5105                         return -1;
5106
5107                 return 0;
5108         } else if (num_exprs > 1) {
5109                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5110                 if (nest == NULL)
5111                         goto nla_put_failure;
5112
5113                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5114                         expr = nft_setelem_expr_at(elem_expr, size);
5115                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, false) < 0)
5116                                 goto nla_put_failure;
5117                 }
5118                 nla_nest_end(skb, nest);
5119         }
5120         return 0;
5121
5122 nla_put_failure:
5123         return -1;
5124 }
5125
5126 static int nf_tables_fill_setelem(struct sk_buff *skb,
5127                                   const struct nft_set *set,
5128                                   const struct nft_set_elem *elem)
5129 {
5130         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5131         unsigned char *b = skb_tail_pointer(skb);
5132         struct nlattr *nest;
5133
5134         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5135         if (nest == NULL)
5136                 goto nla_put_failure;
5137
5138         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5139             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5140                           NFT_DATA_VALUE, set->klen) < 0)
5141                 goto nla_put_failure;
5142
5143         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5144             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5145                           NFT_DATA_VALUE, set->klen) < 0)
5146                 goto nla_put_failure;
5147
5148         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5149             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5150                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5151                           set->dlen) < 0)
5152                 goto nla_put_failure;
5153
5154         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5155             nft_set_elem_expr_dump(skb, set, ext))
5156                 goto nla_put_failure;
5157
5158         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5159             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5160                            (*nft_set_ext_obj(ext))->key.name) < 0)
5161                 goto nla_put_failure;
5162
5163         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5164             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5165                          htonl(*nft_set_ext_flags(ext))))
5166                 goto nla_put_failure;
5167
5168         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5169             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5170                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5171                          NFTA_SET_ELEM_PAD))
5172                 goto nla_put_failure;
5173
5174         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5175                 u64 expires, now = get_jiffies_64();
5176
5177                 expires = *nft_set_ext_expiration(ext);
5178                 if (time_before64(now, expires))
5179                         expires -= now;
5180                 else
5181                         expires = 0;
5182
5183                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5184                                  nf_jiffies64_to_msecs(expires),
5185                                  NFTA_SET_ELEM_PAD))
5186                         goto nla_put_failure;
5187         }
5188
5189         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5190                 struct nft_userdata *udata;
5191
5192                 udata = nft_set_ext_userdata(ext);
5193                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5194                             udata->len + 1, udata->data))
5195                         goto nla_put_failure;
5196         }
5197
5198         nla_nest_end(skb, nest);
5199         return 0;
5200
5201 nla_put_failure:
5202         nlmsg_trim(skb, b);
5203         return -EMSGSIZE;
5204 }
5205
5206 struct nft_set_dump_args {
5207         const struct netlink_callback   *cb;
5208         struct nft_set_iter             iter;
5209         struct sk_buff                  *skb;
5210 };
5211
5212 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5213                                   struct nft_set *set,
5214                                   const struct nft_set_iter *iter,
5215                                   struct nft_set_elem *elem)
5216 {
5217         struct nft_set_dump_args *args;
5218
5219         args = container_of(iter, struct nft_set_dump_args, iter);
5220         return nf_tables_fill_setelem(args->skb, set, elem);
5221 }
5222
5223 struct nft_set_dump_ctx {
5224         const struct nft_set    *set;
5225         struct nft_ctx          ctx;
5226 };
5227
5228 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5229                                  const struct nft_set *set)
5230 {
5231         struct nft_set_elem_catchall *catchall;
5232         u8 genmask = nft_genmask_cur(net);
5233         struct nft_set_elem elem;
5234         struct nft_set_ext *ext;
5235         int ret = 0;
5236
5237         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5238                 ext = nft_set_elem_ext(set, catchall->elem);
5239                 if (!nft_set_elem_active(ext, genmask) ||
5240                     nft_set_elem_expired(ext))
5241                         continue;
5242
5243                 elem.priv = catchall->elem;
5244                 ret = nf_tables_fill_setelem(skb, set, &elem);
5245                 break;
5246         }
5247
5248         return ret;
5249 }
5250
5251 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5252 {
5253         struct nft_set_dump_ctx *dump_ctx = cb->data;
5254         struct net *net = sock_net(skb->sk);
5255         struct nftables_pernet *nft_net;
5256         struct nft_table *table;
5257         struct nft_set *set;
5258         struct nft_set_dump_args args;
5259         bool set_found = false;
5260         struct nlmsghdr *nlh;
5261         struct nlattr *nest;
5262         u32 portid, seq;
5263         int event;
5264
5265         rcu_read_lock();
5266         nft_net = nft_pernet(net);
5267         cb->seq = READ_ONCE(nft_net->base_seq);
5268
5269         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5270                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5271                     dump_ctx->ctx.family != table->family)
5272                         continue;
5273
5274                 if (table != dump_ctx->ctx.table)
5275                         continue;
5276
5277                 list_for_each_entry_rcu(set, &table->sets, list) {
5278                         if (set == dump_ctx->set) {
5279                                 set_found = true;
5280                                 break;
5281                         }
5282                 }
5283                 break;
5284         }
5285
5286         if (!set_found) {
5287                 rcu_read_unlock();
5288                 return -ENOENT;
5289         }
5290
5291         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5292         portid = NETLINK_CB(cb->skb).portid;
5293         seq    = cb->nlh->nlmsg_seq;
5294
5295         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5296                            table->family, NFNETLINK_V0, nft_base_seq(net));
5297         if (!nlh)
5298                 goto nla_put_failure;
5299
5300         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5301                 goto nla_put_failure;
5302         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5303                 goto nla_put_failure;
5304
5305         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5306         if (nest == NULL)
5307                 goto nla_put_failure;
5308
5309         args.cb                 = cb;
5310         args.skb                = skb;
5311         args.iter.genmask       = nft_genmask_cur(net);
5312         args.iter.skip          = cb->args[0];
5313         args.iter.count         = 0;
5314         args.iter.err           = 0;
5315         args.iter.fn            = nf_tables_dump_setelem;
5316         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5317
5318         if (!args.iter.err && args.iter.count == cb->args[0])
5319                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5320         rcu_read_unlock();
5321
5322         nla_nest_end(skb, nest);
5323         nlmsg_end(skb, nlh);
5324
5325         if (args.iter.err && args.iter.err != -EMSGSIZE)
5326                 return args.iter.err;
5327         if (args.iter.count == cb->args[0])
5328                 return 0;
5329
5330         cb->args[0] = args.iter.count;
5331         return skb->len;
5332
5333 nla_put_failure:
5334         rcu_read_unlock();
5335         return -ENOSPC;
5336 }
5337
5338 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5339 {
5340         struct nft_set_dump_ctx *dump_ctx = cb->data;
5341
5342         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5343
5344         return cb->data ? 0 : -ENOMEM;
5345 }
5346
5347 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5348 {
5349         kfree(cb->data);
5350         return 0;
5351 }
5352
5353 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5354                                        const struct nft_ctx *ctx, u32 seq,
5355                                        u32 portid, int event, u16 flags,
5356                                        const struct nft_set *set,
5357                                        const struct nft_set_elem *elem)
5358 {
5359         struct nlmsghdr *nlh;
5360         struct nlattr *nest;
5361         int err;
5362
5363         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5364         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5365                            NFNETLINK_V0, nft_base_seq(ctx->net));
5366         if (!nlh)
5367                 goto nla_put_failure;
5368
5369         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5370                 goto nla_put_failure;
5371         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5372                 goto nla_put_failure;
5373
5374         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5375         if (nest == NULL)
5376                 goto nla_put_failure;
5377
5378         err = nf_tables_fill_setelem(skb, set, elem);
5379         if (err < 0)
5380                 goto nla_put_failure;
5381
5382         nla_nest_end(skb, nest);
5383
5384         nlmsg_end(skb, nlh);
5385         return 0;
5386
5387 nla_put_failure:
5388         nlmsg_trim(skb, nlh);
5389         return -1;
5390 }
5391
5392 static int nft_setelem_parse_flags(const struct nft_set *set,
5393                                    const struct nlattr *attr, u32 *flags)
5394 {
5395         if (attr == NULL)
5396                 return 0;
5397
5398         *flags = ntohl(nla_get_be32(attr));
5399         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5400                 return -EOPNOTSUPP;
5401         if (!(set->flags & NFT_SET_INTERVAL) &&
5402             *flags & NFT_SET_ELEM_INTERVAL_END)
5403                 return -EINVAL;
5404         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5405             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5406                 return -EINVAL;
5407
5408         return 0;
5409 }
5410
5411 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5412                                  struct nft_data *key, struct nlattr *attr)
5413 {
5414         struct nft_data_desc desc = {
5415                 .type   = NFT_DATA_VALUE,
5416                 .size   = NFT_DATA_VALUE_MAXLEN,
5417                 .len    = set->klen,
5418         };
5419
5420         return nft_data_init(ctx, key, &desc, attr);
5421 }
5422
5423 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5424                                   struct nft_data_desc *desc,
5425                                   struct nft_data *data,
5426                                   struct nlattr *attr)
5427 {
5428         u32 dtype;
5429
5430         if (set->dtype == NFT_DATA_VERDICT)
5431                 dtype = NFT_DATA_VERDICT;
5432         else
5433                 dtype = NFT_DATA_VALUE;
5434
5435         desc->type = dtype;
5436         desc->size = NFT_DATA_VALUE_MAXLEN;
5437         desc->len = set->dlen;
5438         desc->flags = NFT_DATA_DESC_SETELEM;
5439
5440         return nft_data_init(ctx, data, desc, attr);
5441 }
5442
5443 static void *nft_setelem_catchall_get(const struct net *net,
5444                                       const struct nft_set *set)
5445 {
5446         struct nft_set_elem_catchall *catchall;
5447         u8 genmask = nft_genmask_cur(net);
5448         struct nft_set_ext *ext;
5449         void *priv = NULL;
5450
5451         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5452                 ext = nft_set_elem_ext(set, catchall->elem);
5453                 if (!nft_set_elem_active(ext, genmask) ||
5454                     nft_set_elem_expired(ext))
5455                         continue;
5456
5457                 priv = catchall->elem;
5458                 break;
5459         }
5460
5461         return priv;
5462 }
5463
5464 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5465                            struct nft_set_elem *elem, u32 flags)
5466 {
5467         void *priv;
5468
5469         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5470                 priv = set->ops->get(ctx->net, set, elem, flags);
5471                 if (IS_ERR(priv))
5472                         return PTR_ERR(priv);
5473         } else {
5474                 priv = nft_setelem_catchall_get(ctx->net, set);
5475                 if (!priv)
5476                         return -ENOENT;
5477         }
5478         elem->priv = priv;
5479
5480         return 0;
5481 }
5482
5483 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5484                             const struct nlattr *attr)
5485 {
5486         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5487         struct nft_set_elem elem;
5488         struct sk_buff *skb;
5489         uint32_t flags = 0;
5490         int err;
5491
5492         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5493                                           nft_set_elem_policy, NULL);
5494         if (err < 0)
5495                 return err;
5496
5497         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5498         if (err < 0)
5499                 return err;
5500
5501         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5502                 return -EINVAL;
5503
5504         if (nla[NFTA_SET_ELEM_KEY]) {
5505                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5506                                             nla[NFTA_SET_ELEM_KEY]);
5507                 if (err < 0)
5508                         return err;
5509         }
5510
5511         if (nla[NFTA_SET_ELEM_KEY_END]) {
5512                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5513                                             nla[NFTA_SET_ELEM_KEY_END]);
5514                 if (err < 0)
5515                         return err;
5516         }
5517
5518         err = nft_setelem_get(ctx, set, &elem, flags);
5519         if (err < 0)
5520                 return err;
5521
5522         err = -ENOMEM;
5523         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5524         if (skb == NULL)
5525                 return err;
5526
5527         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5528                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5529         if (err < 0)
5530                 goto err_fill_setelem;
5531
5532         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5533
5534 err_fill_setelem:
5535         kfree_skb(skb);
5536         return err;
5537 }
5538
5539 /* called with rcu_read_lock held */
5540 static int nf_tables_getsetelem(struct sk_buff *skb,
5541                                 const struct nfnl_info *info,
5542                                 const struct nlattr * const nla[])
5543 {
5544         struct netlink_ext_ack *extack = info->extack;
5545         u8 genmask = nft_genmask_cur(info->net);
5546         u8 family = info->nfmsg->nfgen_family;
5547         struct net *net = info->net;
5548         struct nft_table *table;
5549         struct nft_set *set;
5550         struct nlattr *attr;
5551         struct nft_ctx ctx;
5552         int rem, err = 0;
5553
5554         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5555                                  genmask, 0);
5556         if (IS_ERR(table)) {
5557                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5558                 return PTR_ERR(table);
5559         }
5560
5561         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5562         if (IS_ERR(set))
5563                 return PTR_ERR(set);
5564
5565         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5566
5567         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5568                 struct netlink_dump_control c = {
5569                         .start = nf_tables_dump_set_start,
5570                         .dump = nf_tables_dump_set,
5571                         .done = nf_tables_dump_set_done,
5572                         .module = THIS_MODULE,
5573                 };
5574                 struct nft_set_dump_ctx dump_ctx = {
5575                         .set = set,
5576                         .ctx = ctx,
5577                 };
5578
5579                 c.data = &dump_ctx;
5580                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5581         }
5582
5583         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5584                 return -EINVAL;
5585
5586         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5587                 err = nft_get_set_elem(&ctx, set, attr);
5588                 if (err < 0) {
5589                         NL_SET_BAD_ATTR(extack, attr);
5590                         break;
5591                 }
5592         }
5593
5594         return err;
5595 }
5596
5597 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5598                                      const struct nft_set *set,
5599                                      const struct nft_set_elem *elem,
5600                                      int event)
5601 {
5602         struct nftables_pernet *nft_net;
5603         struct net *net = ctx->net;
5604         u32 portid = ctx->portid;
5605         struct sk_buff *skb;
5606         u16 flags = 0;
5607         int err;
5608
5609         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5610                 return;
5611
5612         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5613         if (skb == NULL)
5614                 goto err;
5615
5616         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5617                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5618
5619         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5620                                           set, elem);
5621         if (err < 0) {
5622                 kfree_skb(skb);
5623                 goto err;
5624         }
5625
5626         nft_net = nft_pernet(net);
5627         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5628         return;
5629 err:
5630         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5631 }
5632
5633 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5634                                               int msg_type,
5635                                               struct nft_set *set)
5636 {
5637         struct nft_trans *trans;
5638
5639         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5640         if (trans == NULL)
5641                 return NULL;
5642
5643         nft_trans_elem_set(trans) = set;
5644         return trans;
5645 }
5646
5647 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5648                                          const struct nft_set *set,
5649                                          const struct nlattr *attr)
5650 {
5651         struct nft_expr *expr;
5652         int err;
5653
5654         expr = nft_expr_init(ctx, attr);
5655         if (IS_ERR(expr))
5656                 return expr;
5657
5658         err = -EOPNOTSUPP;
5659         if (expr->ops->type->flags & NFT_EXPR_GC) {
5660                 if (set->flags & NFT_SET_TIMEOUT)
5661                         goto err_set_elem_expr;
5662                 if (!set->ops->gc_init)
5663                         goto err_set_elem_expr;
5664                 set->ops->gc_init(set);
5665         }
5666
5667         return expr;
5668
5669 err_set_elem_expr:
5670         nft_expr_destroy(ctx, expr);
5671         return ERR_PTR(err);
5672 }
5673
5674 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5675 {
5676         len += nft_set_ext_types[id].len;
5677         if (len > tmpl->ext_len[id] ||
5678             len > U8_MAX)
5679                 return -1;
5680
5681         return 0;
5682 }
5683
5684 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5685                               void *to, const void *from, u32 len)
5686 {
5687         if (nft_set_ext_check(tmpl, id, len) < 0)
5688                 return -1;
5689
5690         memcpy(to, from, len);
5691
5692         return 0;
5693 }
5694
5695 void *nft_set_elem_init(const struct nft_set *set,
5696                         const struct nft_set_ext_tmpl *tmpl,
5697                         const u32 *key, const u32 *key_end,
5698                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5699 {
5700         struct nft_set_ext *ext;
5701         void *elem;
5702
5703         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5704         if (elem == NULL)
5705                 return ERR_PTR(-ENOMEM);
5706
5707         ext = nft_set_elem_ext(set, elem);
5708         nft_set_ext_init(ext, tmpl);
5709
5710         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5711             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5712                                nft_set_ext_key(ext), key, set->klen) < 0)
5713                 goto err_ext_check;
5714
5715         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5716             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5717                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5718                 goto err_ext_check;
5719
5720         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5721             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5722                                nft_set_ext_data(ext), data, set->dlen) < 0)
5723                 goto err_ext_check;
5724
5725         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5726                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5727                 if (expiration == 0)
5728                         *nft_set_ext_expiration(ext) += timeout;
5729         }
5730         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5731                 *nft_set_ext_timeout(ext) = timeout;
5732
5733         return elem;
5734
5735 err_ext_check:
5736         kfree(elem);
5737
5738         return ERR_PTR(-EINVAL);
5739 }
5740
5741 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5742                                         struct nft_expr *expr)
5743 {
5744         if (expr->ops->destroy_clone) {
5745                 expr->ops->destroy_clone(ctx, expr);
5746                 module_put(expr->ops->type->owner);
5747         } else {
5748                 nf_tables_expr_destroy(ctx, expr);
5749         }
5750 }
5751
5752 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5753                                       struct nft_set_elem_expr *elem_expr)
5754 {
5755         struct nft_expr *expr;
5756         u32 size;
5757
5758         nft_setelem_expr_foreach(expr, elem_expr, size)
5759                 __nft_set_elem_expr_destroy(ctx, expr);
5760 }
5761
5762 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5763                           bool destroy_expr)
5764 {
5765         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5766         struct nft_ctx ctx = {
5767                 .net    = read_pnet(&set->net),
5768                 .family = set->table->family,
5769         };
5770
5771         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5772         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5773                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5774         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5775                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5776
5777         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5778                 (*nft_set_ext_obj(ext))->use--;
5779         kfree(elem);
5780 }
5781 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5782
5783 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5784  * with the refcounting from the preparation phase.
5785  */
5786 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5787                                        const struct nft_set *set, void *elem)
5788 {
5789         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5790
5791         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5792                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5793
5794         kfree(elem);
5795 }
5796
5797 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5798                             struct nft_expr *expr_array[])
5799 {
5800         struct nft_expr *expr;
5801         int err, i, k;
5802
5803         for (i = 0; i < set->num_exprs; i++) {
5804                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5805                 if (!expr)
5806                         goto err_expr;
5807
5808                 err = nft_expr_clone(expr, set->exprs[i]);
5809                 if (err < 0) {
5810                         kfree(expr);
5811                         goto err_expr;
5812                 }
5813                 expr_array[i] = expr;
5814         }
5815
5816         return 0;
5817
5818 err_expr:
5819         for (k = i - 1; k >= 0; k--)
5820                 nft_expr_destroy(ctx, expr_array[k]);
5821
5822         return -ENOMEM;
5823 }
5824
5825 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5826                                    const struct nft_set_ext_tmpl *tmpl,
5827                                    const struct nft_set_ext *ext,
5828                                    struct nft_expr *expr_array[],
5829                                    u32 num_exprs)
5830 {
5831         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5832         u32 len = sizeof(struct nft_set_elem_expr);
5833         struct nft_expr *expr;
5834         int i, err;
5835
5836         if (num_exprs == 0)
5837                 return 0;
5838
5839         for (i = 0; i < num_exprs; i++)
5840                 len += expr_array[i]->ops->size;
5841
5842         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5843                 return -EINVAL;
5844
5845         for (i = 0; i < num_exprs; i++) {
5846                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5847                 err = nft_expr_clone(expr, expr_array[i]);
5848                 if (err < 0)
5849                         goto err_elem_expr_setup;
5850
5851                 elem_expr->size += expr_array[i]->ops->size;
5852                 nft_expr_destroy(ctx, expr_array[i]);
5853                 expr_array[i] = NULL;
5854         }
5855
5856         return 0;
5857
5858 err_elem_expr_setup:
5859         for (; i < num_exprs; i++) {
5860                 nft_expr_destroy(ctx, expr_array[i]);
5861                 expr_array[i] = NULL;
5862         }
5863
5864         return -ENOMEM;
5865 }
5866
5867 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5868                                             const struct nft_set *set)
5869 {
5870         struct nft_set_elem_catchall *catchall;
5871         u8 genmask = nft_genmask_cur(net);
5872         struct nft_set_ext *ext;
5873
5874         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5875                 ext = nft_set_elem_ext(set, catchall->elem);
5876                 if (nft_set_elem_active(ext, genmask) &&
5877                     !nft_set_elem_expired(ext))
5878                         return ext;
5879         }
5880
5881         return NULL;
5882 }
5883 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5884
5885 void *nft_set_catchall_gc(const struct nft_set *set)
5886 {
5887         struct nft_set_elem_catchall *catchall, *next;
5888         struct nft_set_ext *ext;
5889         void *elem = NULL;
5890
5891         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5892                 ext = nft_set_elem_ext(set, catchall->elem);
5893
5894                 if (!nft_set_elem_expired(ext) ||
5895                     nft_set_elem_mark_busy(ext))
5896                         continue;
5897
5898                 elem = catchall->elem;
5899                 list_del_rcu(&catchall->list);
5900                 kfree_rcu(catchall, rcu);
5901                 break;
5902         }
5903
5904         return elem;
5905 }
5906 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5907
5908 static int nft_setelem_catchall_insert(const struct net *net,
5909                                        struct nft_set *set,
5910                                        const struct nft_set_elem *elem,
5911                                        struct nft_set_ext **pext)
5912 {
5913         struct nft_set_elem_catchall *catchall;
5914         u8 genmask = nft_genmask_next(net);
5915         struct nft_set_ext *ext;
5916
5917         list_for_each_entry(catchall, &set->catchall_list, list) {
5918                 ext = nft_set_elem_ext(set, catchall->elem);
5919                 if (nft_set_elem_active(ext, genmask)) {
5920                         *pext = ext;
5921                         return -EEXIST;
5922                 }
5923         }
5924
5925         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5926         if (!catchall)
5927                 return -ENOMEM;
5928
5929         catchall->elem = elem->priv;
5930         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5931
5932         return 0;
5933 }
5934
5935 static int nft_setelem_insert(const struct net *net,
5936                               struct nft_set *set,
5937                               const struct nft_set_elem *elem,
5938                               struct nft_set_ext **ext, unsigned int flags)
5939 {
5940         int ret;
5941
5942         if (flags & NFT_SET_ELEM_CATCHALL)
5943                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5944         else
5945                 ret = set->ops->insert(net, set, elem, ext);
5946
5947         return ret;
5948 }
5949
5950 static bool nft_setelem_is_catchall(const struct nft_set *set,
5951                                     const struct nft_set_elem *elem)
5952 {
5953         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5954
5955         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5956             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5957                 return true;
5958
5959         return false;
5960 }
5961
5962 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5963                                  struct nft_set_elem *elem)
5964 {
5965         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5966
5967         if (nft_setelem_is_catchall(set, elem)) {
5968                 nft_set_elem_change_active(net, set, ext);
5969                 nft_set_elem_clear_busy(ext);
5970         } else {
5971                 set->ops->activate(net, set, elem);
5972         }
5973 }
5974
5975 static int nft_setelem_catchall_deactivate(const struct net *net,
5976                                            struct nft_set *set,
5977                                            struct nft_set_elem *elem)
5978 {
5979         struct nft_set_elem_catchall *catchall;
5980         struct nft_set_ext *ext;
5981
5982         list_for_each_entry(catchall, &set->catchall_list, list) {
5983                 ext = nft_set_elem_ext(set, catchall->elem);
5984                 if (!nft_is_active(net, ext) ||
5985                     nft_set_elem_mark_busy(ext))
5986                         continue;
5987
5988                 kfree(elem->priv);
5989                 elem->priv = catchall->elem;
5990                 nft_set_elem_change_active(net, set, ext);
5991                 return 0;
5992         }
5993
5994         return -ENOENT;
5995 }
5996
5997 static int __nft_setelem_deactivate(const struct net *net,
5998                                     struct nft_set *set,
5999                                     struct nft_set_elem *elem)
6000 {
6001         void *priv;
6002
6003         priv = set->ops->deactivate(net, set, elem);
6004         if (!priv)
6005                 return -ENOENT;
6006
6007         kfree(elem->priv);
6008         elem->priv = priv;
6009         set->ndeact++;
6010
6011         return 0;
6012 }
6013
6014 static int nft_setelem_deactivate(const struct net *net,
6015                                   struct nft_set *set,
6016                                   struct nft_set_elem *elem, u32 flags)
6017 {
6018         int ret;
6019
6020         if (flags & NFT_SET_ELEM_CATCHALL)
6021                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6022         else
6023                 ret = __nft_setelem_deactivate(net, set, elem);
6024
6025         return ret;
6026 }
6027
6028 static void nft_setelem_catchall_remove(const struct net *net,
6029                                         const struct nft_set *set,
6030                                         const struct nft_set_elem *elem)
6031 {
6032         struct nft_set_elem_catchall *catchall, *next;
6033
6034         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6035                 if (catchall->elem == elem->priv) {
6036                         list_del_rcu(&catchall->list);
6037                         kfree_rcu(catchall, rcu);
6038                         break;
6039                 }
6040         }
6041 }
6042
6043 static void nft_setelem_remove(const struct net *net,
6044                                const struct nft_set *set,
6045                                const struct nft_set_elem *elem)
6046 {
6047         if (nft_setelem_is_catchall(set, elem))
6048                 nft_setelem_catchall_remove(net, set, elem);
6049         else
6050                 set->ops->remove(net, set, elem);
6051 }
6052
6053 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6054                                       struct nlattr **nla, u32 flags)
6055 {
6056         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6057                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6058                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6059                         return false;
6060
6061                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6062                     flags & NFT_SET_ELEM_CATCHALL)
6063                         return false;
6064         } else {
6065                 if (nla[NFTA_SET_ELEM_KEY_END])
6066                         return false;
6067         }
6068
6069         return true;
6070 }
6071
6072 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6073                             const struct nlattr *attr, u32 nlmsg_flags)
6074 {
6075         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6076         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6077         u8 genmask = nft_genmask_next(ctx->net);
6078         u32 flags = 0, size = 0, num_exprs = 0;
6079         struct nft_set_ext_tmpl tmpl;
6080         struct nft_set_ext *ext, *ext2;
6081         struct nft_set_elem elem;
6082         struct nft_set_binding *binding;
6083         struct nft_object *obj = NULL;
6084         struct nft_userdata *udata;
6085         struct nft_data_desc desc;
6086         enum nft_registers dreg;
6087         struct nft_trans *trans;
6088         u64 timeout;
6089         u64 expiration;
6090         int err, i;
6091         u8 ulen;
6092
6093         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6094                                           nft_set_elem_policy, NULL);
6095         if (err < 0)
6096                 return err;
6097
6098         nft_set_ext_prepare(&tmpl);
6099
6100         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6101         if (err < 0)
6102                 return err;
6103
6104         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6105             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6106                 return -EINVAL;
6107
6108         if (flags != 0) {
6109                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6110                 if (err < 0)
6111                         return err;
6112         }
6113
6114         if (set->flags & NFT_SET_MAP) {
6115                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6116                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6117                         return -EINVAL;
6118         } else {
6119                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6120                         return -EINVAL;
6121         }
6122
6123         if (set->flags & NFT_SET_OBJECT) {
6124                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6125                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6126                         return -EINVAL;
6127         } else {
6128                 if (nla[NFTA_SET_ELEM_OBJREF])
6129                         return -EINVAL;
6130         }
6131
6132         if (!nft_setelem_valid_key_end(set, nla, flags))
6133                 return -EINVAL;
6134
6135         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6136              (nla[NFTA_SET_ELEM_DATA] ||
6137               nla[NFTA_SET_ELEM_OBJREF] ||
6138               nla[NFTA_SET_ELEM_TIMEOUT] ||
6139               nla[NFTA_SET_ELEM_EXPIRATION] ||
6140               nla[NFTA_SET_ELEM_USERDATA] ||
6141               nla[NFTA_SET_ELEM_EXPR] ||
6142               nla[NFTA_SET_ELEM_KEY_END] ||
6143               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6144                 return -EINVAL;
6145
6146         timeout = 0;
6147         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6148                 if (!(set->flags & NFT_SET_TIMEOUT))
6149                         return -EINVAL;
6150                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6151                                             &timeout);
6152                 if (err)
6153                         return err;
6154         } else if (set->flags & NFT_SET_TIMEOUT &&
6155                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6156                 timeout = READ_ONCE(set->timeout);
6157         }
6158
6159         expiration = 0;
6160         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6161                 if (!(set->flags & NFT_SET_TIMEOUT))
6162                         return -EINVAL;
6163                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6164                                             &expiration);
6165                 if (err)
6166                         return err;
6167         }
6168
6169         if (nla[NFTA_SET_ELEM_EXPR]) {
6170                 struct nft_expr *expr;
6171
6172                 if (set->num_exprs && set->num_exprs != 1)
6173                         return -EOPNOTSUPP;
6174
6175                 expr = nft_set_elem_expr_alloc(ctx, set,
6176                                                nla[NFTA_SET_ELEM_EXPR]);
6177                 if (IS_ERR(expr))
6178                         return PTR_ERR(expr);
6179
6180                 expr_array[0] = expr;
6181                 num_exprs = 1;
6182
6183                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6184                         err = -EOPNOTSUPP;
6185                         goto err_set_elem_expr;
6186                 }
6187         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6188                 struct nft_expr *expr;
6189                 struct nlattr *tmp;
6190                 int left;
6191
6192                 i = 0;
6193                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6194                         if (i == NFT_SET_EXPR_MAX ||
6195                             (set->num_exprs && set->num_exprs == i)) {
6196                                 err = -E2BIG;
6197                                 goto err_set_elem_expr;
6198                         }
6199                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6200                                 err = -EINVAL;
6201                                 goto err_set_elem_expr;
6202                         }
6203                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6204                         if (IS_ERR(expr)) {
6205                                 err = PTR_ERR(expr);
6206                                 goto err_set_elem_expr;
6207                         }
6208                         expr_array[i] = expr;
6209                         num_exprs++;
6210
6211                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6212                                 err = -EOPNOTSUPP;
6213                                 goto err_set_elem_expr;
6214                         }
6215                         i++;
6216                 }
6217                 if (set->num_exprs && set->num_exprs != i) {
6218                         err = -EOPNOTSUPP;
6219                         goto err_set_elem_expr;
6220                 }
6221         } else if (set->num_exprs > 0 &&
6222                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6223                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6224                 if (err < 0)
6225                         goto err_set_elem_expr_clone;
6226
6227                 num_exprs = set->num_exprs;
6228         }
6229
6230         if (nla[NFTA_SET_ELEM_KEY]) {
6231                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6232                                             nla[NFTA_SET_ELEM_KEY]);
6233                 if (err < 0)
6234                         goto err_set_elem_expr;
6235
6236                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6237                 if (err < 0)
6238                         goto err_parse_key;
6239         }
6240
6241         if (nla[NFTA_SET_ELEM_KEY_END]) {
6242                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6243                                             nla[NFTA_SET_ELEM_KEY_END]);
6244                 if (err < 0)
6245                         goto err_parse_key;
6246
6247                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6248                 if (err < 0)
6249                         goto err_parse_key_end;
6250         }
6251
6252         if (timeout > 0) {
6253                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6254                 if (err < 0)
6255                         goto err_parse_key_end;
6256
6257                 if (timeout != READ_ONCE(set->timeout)) {
6258                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6259                         if (err < 0)
6260                                 goto err_parse_key_end;
6261                 }
6262         }
6263
6264         if (num_exprs) {
6265                 for (i = 0; i < num_exprs; i++)
6266                         size += expr_array[i]->ops->size;
6267
6268                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6269                                              sizeof(struct nft_set_elem_expr) + size);
6270                 if (err < 0)
6271                         goto err_parse_key_end;
6272         }
6273
6274         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6275                 obj = nft_obj_lookup(ctx->net, ctx->table,
6276                                      nla[NFTA_SET_ELEM_OBJREF],
6277                                      set->objtype, genmask);
6278                 if (IS_ERR(obj)) {
6279                         err = PTR_ERR(obj);
6280                         goto err_parse_key_end;
6281                 }
6282                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6283                 if (err < 0)
6284                         goto err_parse_key_end;
6285         }
6286
6287         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6288                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6289                                              nla[NFTA_SET_ELEM_DATA]);
6290                 if (err < 0)
6291                         goto err_parse_key_end;
6292
6293                 dreg = nft_type_to_reg(set->dtype);
6294                 list_for_each_entry(binding, &set->bindings, list) {
6295                         struct nft_ctx bind_ctx = {
6296                                 .net    = ctx->net,
6297                                 .family = ctx->family,
6298                                 .table  = ctx->table,
6299                                 .chain  = (struct nft_chain *)binding->chain,
6300                         };
6301
6302                         if (!(binding->flags & NFT_SET_MAP))
6303                                 continue;
6304
6305                         err = nft_validate_register_store(&bind_ctx, dreg,
6306                                                           &elem.data.val,
6307                                                           desc.type, desc.len);
6308                         if (err < 0)
6309                                 goto err_parse_data;
6310
6311                         if (desc.type == NFT_DATA_VERDICT &&
6312                             (elem.data.val.verdict.code == NFT_GOTO ||
6313                              elem.data.val.verdict.code == NFT_JUMP))
6314                                 nft_validate_state_update(ctx->table,
6315                                                           NFT_VALIDATE_NEED);
6316                 }
6317
6318                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6319                 if (err < 0)
6320                         goto err_parse_data;
6321         }
6322
6323         /* The full maximum length of userdata can exceed the maximum
6324          * offset value (U8_MAX) for following extensions, therefor it
6325          * must be the last extension added.
6326          */
6327         ulen = 0;
6328         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6329                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6330                 if (ulen > 0) {
6331                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6332                                                      ulen);
6333                         if (err < 0)
6334                                 goto err_parse_data;
6335                 }
6336         }
6337
6338         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6339                                       elem.key_end.val.data, elem.data.val.data,
6340                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6341         if (IS_ERR(elem.priv)) {
6342                 err = PTR_ERR(elem.priv);
6343                 goto err_parse_data;
6344         }
6345
6346         ext = nft_set_elem_ext(set, elem.priv);
6347         if (flags)
6348                 *nft_set_ext_flags(ext) = flags;
6349
6350         if (ulen > 0) {
6351                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6352                         err = -EINVAL;
6353                         goto err_elem_userdata;
6354                 }
6355                 udata = nft_set_ext_userdata(ext);
6356                 udata->len = ulen - 1;
6357                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6358         }
6359         if (obj) {
6360                 *nft_set_ext_obj(ext) = obj;
6361                 obj->use++;
6362         }
6363         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6364         if (err < 0)
6365                 goto err_elem_free;
6366
6367         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6368         if (trans == NULL) {
6369                 err = -ENOMEM;
6370                 goto err_elem_free;
6371         }
6372
6373         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6374
6375         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6376         if (err) {
6377                 if (err == -EEXIST) {
6378                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6379                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6380                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6381                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6382                                 goto err_element_clash;
6383                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6384                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6385                              memcmp(nft_set_ext_data(ext),
6386                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6387                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6388                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6389                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6390                                 goto err_element_clash;
6391                         else if (!(nlmsg_flags & NLM_F_EXCL))
6392                                 err = 0;
6393                 } else if (err == -ENOTEMPTY) {
6394                         /* ENOTEMPTY reports overlapping between this element
6395                          * and an existing one.
6396                          */
6397                         err = -EEXIST;
6398                 }
6399                 goto err_element_clash;
6400         }
6401
6402         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6403             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6404                 err = -ENFILE;
6405                 goto err_set_full;
6406         }
6407
6408         nft_trans_elem(trans) = elem;
6409         nft_trans_commit_list_add_tail(ctx->net, trans);
6410         return 0;
6411
6412 err_set_full:
6413         nft_setelem_remove(ctx->net, set, &elem);
6414 err_element_clash:
6415         kfree(trans);
6416 err_elem_free:
6417         if (obj)
6418                 obj->use--;
6419 err_elem_userdata:
6420         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6421 err_parse_data:
6422         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6423                 nft_data_release(&elem.data.val, desc.type);
6424 err_parse_key_end:
6425         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6426 err_parse_key:
6427         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6428 err_set_elem_expr:
6429         for (i = 0; i < num_exprs && expr_array[i]; i++)
6430                 nft_expr_destroy(ctx, expr_array[i]);
6431 err_set_elem_expr_clone:
6432         return err;
6433 }
6434
6435 static int nf_tables_newsetelem(struct sk_buff *skb,
6436                                 const struct nfnl_info *info,
6437                                 const struct nlattr * const nla[])
6438 {
6439         struct netlink_ext_ack *extack = info->extack;
6440         u8 genmask = nft_genmask_next(info->net);
6441         u8 family = info->nfmsg->nfgen_family;
6442         struct net *net = info->net;
6443         const struct nlattr *attr;
6444         struct nft_table *table;
6445         struct nft_set *set;
6446         struct nft_ctx ctx;
6447         int rem, err;
6448
6449         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6450                 return -EINVAL;
6451
6452         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6453                                  genmask, NETLINK_CB(skb).portid);
6454         if (IS_ERR(table)) {
6455                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6456                 return PTR_ERR(table);
6457         }
6458
6459         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6460                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6461         if (IS_ERR(set))
6462                 return PTR_ERR(set);
6463
6464         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6465                 return -EBUSY;
6466
6467         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6468
6469         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6470                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6471                 if (err < 0) {
6472                         NL_SET_BAD_ATTR(extack, attr);
6473                         return err;
6474                 }
6475         }
6476
6477         if (table->validate_state == NFT_VALIDATE_DO)
6478                 return nft_table_validate(net, table);
6479
6480         return 0;
6481 }
6482
6483 /**
6484  *      nft_data_hold - hold a nft_data item
6485  *
6486  *      @data: struct nft_data to release
6487  *      @type: type of data
6488  *
6489  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6490  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6491  *      NFT_GOTO verdicts. This function must be called on active data objects
6492  *      from the second phase of the commit protocol.
6493  */
6494 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6495 {
6496         struct nft_chain *chain;
6497         struct nft_rule *rule;
6498
6499         if (type == NFT_DATA_VERDICT) {
6500                 switch (data->verdict.code) {
6501                 case NFT_JUMP:
6502                 case NFT_GOTO:
6503                         chain = data->verdict.chain;
6504                         chain->use++;
6505
6506                         if (!nft_chain_is_bound(chain))
6507                                 break;
6508
6509                         chain->table->use++;
6510                         list_for_each_entry(rule, &chain->rules, list)
6511                                 chain->use++;
6512
6513                         nft_chain_add(chain->table, chain);
6514                         break;
6515                 }
6516         }
6517 }
6518
6519 static void nft_setelem_data_activate(const struct net *net,
6520                                       const struct nft_set *set,
6521                                       struct nft_set_elem *elem)
6522 {
6523         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6524
6525         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6526                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6527         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6528                 (*nft_set_ext_obj(ext))->use++;
6529 }
6530
6531 static void nft_setelem_data_deactivate(const struct net *net,
6532                                         const struct nft_set *set,
6533                                         struct nft_set_elem *elem)
6534 {
6535         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6536
6537         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6538                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6539         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6540                 (*nft_set_ext_obj(ext))->use--;
6541 }
6542
6543 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6544                            const struct nlattr *attr)
6545 {
6546         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6547         struct nft_set_ext_tmpl tmpl;
6548         struct nft_set_elem elem;
6549         struct nft_set_ext *ext;
6550         struct nft_trans *trans;
6551         u32 flags = 0;
6552         int err;
6553
6554         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6555                                           nft_set_elem_policy, NULL);
6556         if (err < 0)
6557                 return err;
6558
6559         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6560         if (err < 0)
6561                 return err;
6562
6563         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6564                 return -EINVAL;
6565
6566         if (!nft_setelem_valid_key_end(set, nla, flags))
6567                 return -EINVAL;
6568
6569         nft_set_ext_prepare(&tmpl);
6570
6571         if (flags != 0) {
6572                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6573                 if (err < 0)
6574                         return err;
6575         }
6576
6577         if (nla[NFTA_SET_ELEM_KEY]) {
6578                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6579                                             nla[NFTA_SET_ELEM_KEY]);
6580                 if (err < 0)
6581                         return err;
6582
6583                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6584                 if (err < 0)
6585                         goto fail_elem;
6586         }
6587
6588         if (nla[NFTA_SET_ELEM_KEY_END]) {
6589                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6590                                             nla[NFTA_SET_ELEM_KEY_END]);
6591                 if (err < 0)
6592                         goto fail_elem;
6593
6594                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6595                 if (err < 0)
6596                         goto fail_elem_key_end;
6597         }
6598
6599         err = -ENOMEM;
6600         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6601                                       elem.key_end.val.data, NULL, 0, 0,
6602                                       GFP_KERNEL_ACCOUNT);
6603         if (IS_ERR(elem.priv)) {
6604                 err = PTR_ERR(elem.priv);
6605                 goto fail_elem_key_end;
6606         }
6607
6608         ext = nft_set_elem_ext(set, elem.priv);
6609         if (flags)
6610                 *nft_set_ext_flags(ext) = flags;
6611
6612         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6613         if (trans == NULL)
6614                 goto fail_trans;
6615
6616         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6617         if (err < 0)
6618                 goto fail_ops;
6619
6620         nft_setelem_data_deactivate(ctx->net, set, &elem);
6621
6622         nft_trans_elem(trans) = elem;
6623         nft_trans_commit_list_add_tail(ctx->net, trans);
6624         return 0;
6625
6626 fail_ops:
6627         kfree(trans);
6628 fail_trans:
6629         kfree(elem.priv);
6630 fail_elem_key_end:
6631         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6632 fail_elem:
6633         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6634         return err;
6635 }
6636
6637 static int nft_setelem_flush(const struct nft_ctx *ctx,
6638                              struct nft_set *set,
6639                              const struct nft_set_iter *iter,
6640                              struct nft_set_elem *elem)
6641 {
6642         struct nft_trans *trans;
6643         int err;
6644
6645         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6646                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6647         if (!trans)
6648                 return -ENOMEM;
6649
6650         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6651                 err = -ENOENT;
6652                 goto err1;
6653         }
6654         set->ndeact++;
6655
6656         nft_setelem_data_deactivate(ctx->net, set, elem);
6657         nft_trans_elem_set(trans) = set;
6658         nft_trans_elem(trans) = *elem;
6659         nft_trans_commit_list_add_tail(ctx->net, trans);
6660
6661         return 0;
6662 err1:
6663         kfree(trans);
6664         return err;
6665 }
6666
6667 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6668                                     struct nft_set *set,
6669                                     struct nft_set_elem *elem)
6670 {
6671         struct nft_trans *trans;
6672
6673         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6674                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6675         if (!trans)
6676                 return -ENOMEM;
6677
6678         nft_setelem_data_deactivate(ctx->net, set, elem);
6679         nft_trans_elem_set(trans) = set;
6680         nft_trans_elem(trans) = *elem;
6681         nft_trans_commit_list_add_tail(ctx->net, trans);
6682
6683         return 0;
6684 }
6685
6686 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6687                                   struct nft_set *set)
6688 {
6689         u8 genmask = nft_genmask_next(ctx->net);
6690         struct nft_set_elem_catchall *catchall;
6691         struct nft_set_elem elem;
6692         struct nft_set_ext *ext;
6693         int ret = 0;
6694
6695         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6696                 ext = nft_set_elem_ext(set, catchall->elem);
6697                 if (!nft_set_elem_active(ext, genmask) ||
6698                     nft_set_elem_mark_busy(ext))
6699                         continue;
6700
6701                 elem.priv = catchall->elem;
6702                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6703                 if (ret < 0)
6704                         break;
6705         }
6706
6707         return ret;
6708 }
6709
6710 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6711 {
6712         struct nft_set_iter iter = {
6713                 .genmask        = genmask,
6714                 .fn             = nft_setelem_flush,
6715         };
6716
6717         set->ops->walk(ctx, set, &iter);
6718         if (!iter.err)
6719                 iter.err = nft_set_catchall_flush(ctx, set);
6720
6721         return iter.err;
6722 }
6723
6724 static int nf_tables_delsetelem(struct sk_buff *skb,
6725                                 const struct nfnl_info *info,
6726                                 const struct nlattr * const nla[])
6727 {
6728         struct netlink_ext_ack *extack = info->extack;
6729         u8 genmask = nft_genmask_next(info->net);
6730         u8 family = info->nfmsg->nfgen_family;
6731         struct net *net = info->net;
6732         const struct nlattr *attr;
6733         struct nft_table *table;
6734         struct nft_set *set;
6735         struct nft_ctx ctx;
6736         int rem, err = 0;
6737
6738         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6739                                  genmask, NETLINK_CB(skb).portid);
6740         if (IS_ERR(table)) {
6741                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6742                 return PTR_ERR(table);
6743         }
6744
6745         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6746         if (IS_ERR(set))
6747                 return PTR_ERR(set);
6748         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6749                 return -EBUSY;
6750
6751         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6752
6753         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6754                 return nft_set_flush(&ctx, set, genmask);
6755
6756         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6757                 err = nft_del_setelem(&ctx, set, attr);
6758                 if (err == -ENOENT &&
6759                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
6760                         continue;
6761
6762                 if (err < 0) {
6763                         NL_SET_BAD_ATTR(extack, attr);
6764                         break;
6765                 }
6766         }
6767         return err;
6768 }
6769
6770 void nft_set_gc_batch_release(struct rcu_head *rcu)
6771 {
6772         struct nft_set_gc_batch *gcb;
6773         unsigned int i;
6774
6775         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6776         for (i = 0; i < gcb->head.cnt; i++)
6777                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6778         kfree(gcb);
6779 }
6780
6781 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6782                                                 gfp_t gfp)
6783 {
6784         struct nft_set_gc_batch *gcb;
6785
6786         gcb = kzalloc(sizeof(*gcb), gfp);
6787         if (gcb == NULL)
6788                 return gcb;
6789         gcb->head.set = set;
6790         return gcb;
6791 }
6792
6793 /*
6794  * Stateful objects
6795  */
6796
6797 /**
6798  *      nft_register_obj- register nf_tables stateful object type
6799  *      @obj_type: object type
6800  *
6801  *      Registers the object type for use with nf_tables. Returns zero on
6802  *      success or a negative errno code otherwise.
6803  */
6804 int nft_register_obj(struct nft_object_type *obj_type)
6805 {
6806         if (obj_type->type == NFT_OBJECT_UNSPEC)
6807                 return -EINVAL;
6808
6809         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6810         list_add_rcu(&obj_type->list, &nf_tables_objects);
6811         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6812         return 0;
6813 }
6814 EXPORT_SYMBOL_GPL(nft_register_obj);
6815
6816 /**
6817  *      nft_unregister_obj - unregister nf_tables object type
6818  *      @obj_type: object type
6819  *
6820  *      Unregisters the object type for use with nf_tables.
6821  */
6822 void nft_unregister_obj(struct nft_object_type *obj_type)
6823 {
6824         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6825         list_del_rcu(&obj_type->list);
6826         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6827 }
6828 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6829
6830 struct nft_object *nft_obj_lookup(const struct net *net,
6831                                   const struct nft_table *table,
6832                                   const struct nlattr *nla, u32 objtype,
6833                                   u8 genmask)
6834 {
6835         struct nft_object_hash_key k = { .table = table };
6836         char search[NFT_OBJ_MAXNAMELEN];
6837         struct rhlist_head *tmp, *list;
6838         struct nft_object *obj;
6839
6840         nla_strscpy(search, nla, sizeof(search));
6841         k.name = search;
6842
6843         WARN_ON_ONCE(!rcu_read_lock_held() &&
6844                      !lockdep_commit_lock_is_held(net));
6845
6846         rcu_read_lock();
6847         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6848         if (!list)
6849                 goto out;
6850
6851         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6852                 if (objtype == obj->ops->type->type &&
6853                     nft_active_genmask(obj, genmask)) {
6854                         rcu_read_unlock();
6855                         return obj;
6856                 }
6857         }
6858 out:
6859         rcu_read_unlock();
6860         return ERR_PTR(-ENOENT);
6861 }
6862 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6863
6864 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6865                                                   const struct nlattr *nla,
6866                                                   u32 objtype, u8 genmask)
6867 {
6868         struct nft_object *obj;
6869
6870         list_for_each_entry(obj, &table->objects, list) {
6871                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6872                     objtype == obj->ops->type->type &&
6873                     nft_active_genmask(obj, genmask))
6874                         return obj;
6875         }
6876         return ERR_PTR(-ENOENT);
6877 }
6878
6879 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6880         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6881                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6882         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6883                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6884         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6885         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6886         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6887         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6888                                     .len = NFT_USERDATA_MAXLEN },
6889 };
6890
6891 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6892                                        const struct nft_object_type *type,
6893                                        const struct nlattr *attr)
6894 {
6895         struct nlattr **tb;
6896         const struct nft_object_ops *ops;
6897         struct nft_object *obj;
6898         int err = -ENOMEM;
6899
6900         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6901         if (!tb)
6902                 goto err1;
6903
6904         if (attr) {
6905                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6906                                                   type->policy, NULL);
6907                 if (err < 0)
6908                         goto err2;
6909         } else {
6910                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6911         }
6912
6913         if (type->select_ops) {
6914                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6915                 if (IS_ERR(ops)) {
6916                         err = PTR_ERR(ops);
6917                         goto err2;
6918                 }
6919         } else {
6920                 ops = type->ops;
6921         }
6922
6923         err = -ENOMEM;
6924         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6925         if (!obj)
6926                 goto err2;
6927
6928         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6929         if (err < 0)
6930                 goto err3;
6931
6932         obj->ops = ops;
6933
6934         kfree(tb);
6935         return obj;
6936 err3:
6937         kfree(obj);
6938 err2:
6939         kfree(tb);
6940 err1:
6941         return ERR_PTR(err);
6942 }
6943
6944 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6945                            struct nft_object *obj, bool reset)
6946 {
6947         struct nlattr *nest;
6948
6949         nest = nla_nest_start_noflag(skb, attr);
6950         if (!nest)
6951                 goto nla_put_failure;
6952         if (obj->ops->dump(skb, obj, reset) < 0)
6953                 goto nla_put_failure;
6954         nla_nest_end(skb, nest);
6955         return 0;
6956
6957 nla_put_failure:
6958         return -1;
6959 }
6960
6961 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6962 {
6963         const struct nft_object_type *type;
6964
6965         list_for_each_entry(type, &nf_tables_objects, list) {
6966                 if (objtype == type->type)
6967                         return type;
6968         }
6969         return NULL;
6970 }
6971
6972 static const struct nft_object_type *
6973 nft_obj_type_get(struct net *net, u32 objtype)
6974 {
6975         const struct nft_object_type *type;
6976
6977         type = __nft_obj_type_get(objtype);
6978         if (type != NULL && try_module_get(type->owner))
6979                 return type;
6980
6981         lockdep_nfnl_nft_mutex_not_held();
6982 #ifdef CONFIG_MODULES
6983         if (type == NULL) {
6984                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6985                         return ERR_PTR(-EAGAIN);
6986         }
6987 #endif
6988         return ERR_PTR(-ENOENT);
6989 }
6990
6991 static int nf_tables_updobj(const struct nft_ctx *ctx,
6992                             const struct nft_object_type *type,
6993                             const struct nlattr *attr,
6994                             struct nft_object *obj)
6995 {
6996         struct nft_object *newobj;
6997         struct nft_trans *trans;
6998         int err = -ENOMEM;
6999
7000         if (!try_module_get(type->owner))
7001                 return -ENOENT;
7002
7003         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7004                                 sizeof(struct nft_trans_obj));
7005         if (!trans)
7006                 goto err_trans;
7007
7008         newobj = nft_obj_init(ctx, type, attr);
7009         if (IS_ERR(newobj)) {
7010                 err = PTR_ERR(newobj);
7011                 goto err_free_trans;
7012         }
7013
7014         nft_trans_obj(trans) = obj;
7015         nft_trans_obj_update(trans) = true;
7016         nft_trans_obj_newobj(trans) = newobj;
7017         nft_trans_commit_list_add_tail(ctx->net, trans);
7018
7019         return 0;
7020
7021 err_free_trans:
7022         kfree(trans);
7023 err_trans:
7024         module_put(type->owner);
7025         return err;
7026 }
7027
7028 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7029                             const struct nlattr * const nla[])
7030 {
7031         struct netlink_ext_ack *extack = info->extack;
7032         u8 genmask = nft_genmask_next(info->net);
7033         u8 family = info->nfmsg->nfgen_family;
7034         const struct nft_object_type *type;
7035         struct net *net = info->net;
7036         struct nft_table *table;
7037         struct nft_object *obj;
7038         struct nft_ctx ctx;
7039         u32 objtype;
7040         int err;
7041
7042         if (!nla[NFTA_OBJ_TYPE] ||
7043             !nla[NFTA_OBJ_NAME] ||
7044             !nla[NFTA_OBJ_DATA])
7045                 return -EINVAL;
7046
7047         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7048                                  NETLINK_CB(skb).portid);
7049         if (IS_ERR(table)) {
7050                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7051                 return PTR_ERR(table);
7052         }
7053
7054         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7055         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7056         if (IS_ERR(obj)) {
7057                 err = PTR_ERR(obj);
7058                 if (err != -ENOENT) {
7059                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7060                         return err;
7061                 }
7062         } else {
7063                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7064                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7065                         return -EEXIST;
7066                 }
7067                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7068                         return -EOPNOTSUPP;
7069
7070                 type = __nft_obj_type_get(objtype);
7071                 if (WARN_ON_ONCE(!type))
7072                         return -ENOENT;
7073
7074                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7075
7076                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7077         }
7078
7079         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7080
7081         type = nft_obj_type_get(net, objtype);
7082         if (IS_ERR(type))
7083                 return PTR_ERR(type);
7084
7085         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7086         if (IS_ERR(obj)) {
7087                 err = PTR_ERR(obj);
7088                 goto err_init;
7089         }
7090         obj->key.table = table;
7091         obj->handle = nf_tables_alloc_handle(table);
7092
7093         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7094         if (!obj->key.name) {
7095                 err = -ENOMEM;
7096                 goto err_strdup;
7097         }
7098
7099         if (nla[NFTA_OBJ_USERDATA]) {
7100                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7101                 if (obj->udata == NULL)
7102                         goto err_userdata;
7103
7104                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7105         }
7106
7107         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7108         if (err < 0)
7109                 goto err_trans;
7110
7111         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7112                               nft_objname_ht_params);
7113         if (err < 0)
7114                 goto err_obj_ht;
7115
7116         list_add_tail_rcu(&obj->list, &table->objects);
7117         table->use++;
7118         return 0;
7119 err_obj_ht:
7120         /* queued in transaction log */
7121         INIT_LIST_HEAD(&obj->list);
7122         return err;
7123 err_trans:
7124         kfree(obj->udata);
7125 err_userdata:
7126         kfree(obj->key.name);
7127 err_strdup:
7128         if (obj->ops->destroy)
7129                 obj->ops->destroy(&ctx, obj);
7130         kfree(obj);
7131 err_init:
7132         module_put(type->owner);
7133         return err;
7134 }
7135
7136 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7137                                    u32 portid, u32 seq, int event, u32 flags,
7138                                    int family, const struct nft_table *table,
7139                                    struct nft_object *obj, bool reset)
7140 {
7141         struct nlmsghdr *nlh;
7142
7143         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7144         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7145                            NFNETLINK_V0, nft_base_seq(net));
7146         if (!nlh)
7147                 goto nla_put_failure;
7148
7149         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7150             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7151             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7152             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7153             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
7154             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7155                          NFTA_OBJ_PAD))
7156                 goto nla_put_failure;
7157
7158         if (obj->udata &&
7159             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7160                 goto nla_put_failure;
7161
7162         nlmsg_end(skb, nlh);
7163         return 0;
7164
7165 nla_put_failure:
7166         nlmsg_trim(skb, nlh);
7167         return -1;
7168 }
7169
7170 struct nft_obj_filter {
7171         char            *table;
7172         u32             type;
7173 };
7174
7175 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7176 {
7177         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7178         const struct nft_table *table;
7179         unsigned int idx = 0, s_idx = cb->args[0];
7180         struct nft_obj_filter *filter = cb->data;
7181         struct net *net = sock_net(skb->sk);
7182         int family = nfmsg->nfgen_family;
7183         struct nftables_pernet *nft_net;
7184         struct nft_object *obj;
7185         bool reset = false;
7186
7187         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7188                 reset = true;
7189
7190         rcu_read_lock();
7191         nft_net = nft_pernet(net);
7192         cb->seq = READ_ONCE(nft_net->base_seq);
7193
7194         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7195                 if (family != NFPROTO_UNSPEC && family != table->family)
7196                         continue;
7197
7198                 list_for_each_entry_rcu(obj, &table->objects, list) {
7199                         if (!nft_is_active(net, obj))
7200                                 goto cont;
7201                         if (idx < s_idx)
7202                                 goto cont;
7203                         if (idx > s_idx)
7204                                 memset(&cb->args[1], 0,
7205                                        sizeof(cb->args) - sizeof(cb->args[0]));
7206                         if (filter && filter->table &&
7207                             strcmp(filter->table, table->name))
7208                                 goto cont;
7209                         if (filter &&
7210                             filter->type != NFT_OBJECT_UNSPEC &&
7211                             obj->ops->type->type != filter->type)
7212                                 goto cont;
7213                         if (reset) {
7214                                 char *buf = kasprintf(GFP_ATOMIC,
7215                                                       "%s:%u",
7216                                                       table->name,
7217                                                       nft_net->base_seq);
7218
7219                                 audit_log_nfcfg(buf,
7220                                                 family,
7221                                                 obj->handle,
7222                                                 AUDIT_NFT_OP_OBJ_RESET,
7223                                                 GFP_ATOMIC);
7224                                 kfree(buf);
7225                         }
7226
7227                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7228                                                     cb->nlh->nlmsg_seq,
7229                                                     NFT_MSG_NEWOBJ,
7230                                                     NLM_F_MULTI | NLM_F_APPEND,
7231                                                     table->family, table,
7232                                                     obj, reset) < 0)
7233                                 goto done;
7234
7235                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7236 cont:
7237                         idx++;
7238                 }
7239         }
7240 done:
7241         rcu_read_unlock();
7242
7243         cb->args[0] = idx;
7244         return skb->len;
7245 }
7246
7247 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7248 {
7249         const struct nlattr * const *nla = cb->data;
7250         struct nft_obj_filter *filter = NULL;
7251
7252         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7253                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7254                 if (!filter)
7255                         return -ENOMEM;
7256
7257                 if (nla[NFTA_OBJ_TABLE]) {
7258                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7259                         if (!filter->table) {
7260                                 kfree(filter);
7261                                 return -ENOMEM;
7262                         }
7263                 }
7264
7265                 if (nla[NFTA_OBJ_TYPE])
7266                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7267         }
7268
7269         cb->data = filter;
7270         return 0;
7271 }
7272
7273 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7274 {
7275         struct nft_obj_filter *filter = cb->data;
7276
7277         if (filter) {
7278                 kfree(filter->table);
7279                 kfree(filter);
7280         }
7281
7282         return 0;
7283 }
7284
7285 /* called with rcu_read_lock held */
7286 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7287                             const struct nlattr * const nla[])
7288 {
7289         struct netlink_ext_ack *extack = info->extack;
7290         u8 genmask = nft_genmask_cur(info->net);
7291         u8 family = info->nfmsg->nfgen_family;
7292         const struct nft_table *table;
7293         struct net *net = info->net;
7294         struct nft_object *obj;
7295         struct sk_buff *skb2;
7296         bool reset = false;
7297         u32 objtype;
7298         int err;
7299
7300         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7301                 struct netlink_dump_control c = {
7302                         .start = nf_tables_dump_obj_start,
7303                         .dump = nf_tables_dump_obj,
7304                         .done = nf_tables_dump_obj_done,
7305                         .module = THIS_MODULE,
7306                         .data = (void *)nla,
7307                 };
7308
7309                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7310         }
7311
7312         if (!nla[NFTA_OBJ_NAME] ||
7313             !nla[NFTA_OBJ_TYPE])
7314                 return -EINVAL;
7315
7316         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7317         if (IS_ERR(table)) {
7318                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7319                 return PTR_ERR(table);
7320         }
7321
7322         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7323         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7324         if (IS_ERR(obj)) {
7325                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7326                 return PTR_ERR(obj);
7327         }
7328
7329         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7330         if (!skb2)
7331                 return -ENOMEM;
7332
7333         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7334                 reset = true;
7335
7336         if (reset) {
7337                 const struct nftables_pernet *nft_net;
7338                 char *buf;
7339
7340                 nft_net = nft_pernet(net);
7341                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7342
7343                 audit_log_nfcfg(buf,
7344                                 family,
7345                                 obj->handle,
7346                                 AUDIT_NFT_OP_OBJ_RESET,
7347                                 GFP_ATOMIC);
7348                 kfree(buf);
7349         }
7350
7351         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7352                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7353                                       family, table, obj, reset);
7354         if (err < 0)
7355                 goto err_fill_obj_info;
7356
7357         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7358
7359 err_fill_obj_info:
7360         kfree_skb(skb2);
7361         return err;
7362 }
7363
7364 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7365 {
7366         if (obj->ops->destroy)
7367                 obj->ops->destroy(ctx, obj);
7368
7369         module_put(obj->ops->type->owner);
7370         kfree(obj->key.name);
7371         kfree(obj->udata);
7372         kfree(obj);
7373 }
7374
7375 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7376                             const struct nlattr * const nla[])
7377 {
7378         struct netlink_ext_ack *extack = info->extack;
7379         u8 genmask = nft_genmask_next(info->net);
7380         u8 family = info->nfmsg->nfgen_family;
7381         struct net *net = info->net;
7382         const struct nlattr *attr;
7383         struct nft_table *table;
7384         struct nft_object *obj;
7385         struct nft_ctx ctx;
7386         u32 objtype;
7387
7388         if (!nla[NFTA_OBJ_TYPE] ||
7389             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7390                 return -EINVAL;
7391
7392         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7393                                  NETLINK_CB(skb).portid);
7394         if (IS_ERR(table)) {
7395                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7396                 return PTR_ERR(table);
7397         }
7398
7399         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7400         if (nla[NFTA_OBJ_HANDLE]) {
7401                 attr = nla[NFTA_OBJ_HANDLE];
7402                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7403         } else {
7404                 attr = nla[NFTA_OBJ_NAME];
7405                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7406         }
7407
7408         if (IS_ERR(obj)) {
7409                 if (PTR_ERR(obj) == -ENOENT &&
7410                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7411                         return 0;
7412
7413                 NL_SET_BAD_ATTR(extack, attr);
7414                 return PTR_ERR(obj);
7415         }
7416         if (obj->use > 0) {
7417                 NL_SET_BAD_ATTR(extack, attr);
7418                 return -EBUSY;
7419         }
7420
7421         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7422
7423         return nft_delobj(&ctx, obj);
7424 }
7425
7426 void nft_obj_notify(struct net *net, const struct nft_table *table,
7427                     struct nft_object *obj, u32 portid, u32 seq, int event,
7428                     u16 flags, int family, int report, gfp_t gfp)
7429 {
7430         struct nftables_pernet *nft_net = nft_pernet(net);
7431         struct sk_buff *skb;
7432         int err;
7433         char *buf = kasprintf(gfp, "%s:%u",
7434                               table->name, nft_net->base_seq);
7435
7436         audit_log_nfcfg(buf,
7437                         family,
7438                         obj->handle,
7439                         event == NFT_MSG_NEWOBJ ?
7440                                  AUDIT_NFT_OP_OBJ_REGISTER :
7441                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7442                         gfp);
7443         kfree(buf);
7444
7445         if (!report &&
7446             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7447                 return;
7448
7449         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7450         if (skb == NULL)
7451                 goto err;
7452
7453         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7454                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7455                                       family, table, obj, false);
7456         if (err < 0) {
7457                 kfree_skb(skb);
7458                 goto err;
7459         }
7460
7461         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7462         return;
7463 err:
7464         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7465 }
7466 EXPORT_SYMBOL_GPL(nft_obj_notify);
7467
7468 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7469                                  struct nft_object *obj, int event)
7470 {
7471         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7472                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7473 }
7474
7475 /*
7476  * Flow tables
7477  */
7478 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7479 {
7480         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7481         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7482         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7483 }
7484 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7485
7486 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7487 {
7488         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7489         list_del_rcu(&type->list);
7490         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7491 }
7492 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7493
7494 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7495         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7496                                             .len = NFT_NAME_MAXLEN - 1 },
7497         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7498                                             .len = NFT_NAME_MAXLEN - 1 },
7499         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7500         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7501         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7502 };
7503
7504 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7505                                            const struct nlattr *nla, u8 genmask)
7506 {
7507         struct nft_flowtable *flowtable;
7508
7509         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7510                 if (!nla_strcmp(nla, flowtable->name) &&
7511                     nft_active_genmask(flowtable, genmask))
7512                         return flowtable;
7513         }
7514         return ERR_PTR(-ENOENT);
7515 }
7516 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7517
7518 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7519                                     struct nft_flowtable *flowtable,
7520                                     enum nft_trans_phase phase)
7521 {
7522         switch (phase) {
7523         case NFT_TRANS_PREPARE:
7524         case NFT_TRANS_ABORT:
7525         case NFT_TRANS_RELEASE:
7526                 flowtable->use--;
7527                 fallthrough;
7528         default:
7529                 return;
7530         }
7531 }
7532 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7533
7534 static struct nft_flowtable *
7535 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7536                               const struct nlattr *nla, u8 genmask)
7537 {
7538        struct nft_flowtable *flowtable;
7539
7540        list_for_each_entry(flowtable, &table->flowtables, list) {
7541                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7542                    nft_active_genmask(flowtable, genmask))
7543                        return flowtable;
7544        }
7545        return ERR_PTR(-ENOENT);
7546 }
7547
7548 struct nft_flowtable_hook {
7549         u32                     num;
7550         int                     priority;
7551         struct list_head        list;
7552 };
7553
7554 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7555         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7556         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7557         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7558 };
7559
7560 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7561                                     const struct nlattr *attr,
7562                                     struct nft_flowtable_hook *flowtable_hook,
7563                                     struct nft_flowtable *flowtable, bool add)
7564 {
7565         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7566         struct nft_hook *hook;
7567         int hooknum, priority;
7568         int err;
7569
7570         INIT_LIST_HEAD(&flowtable_hook->list);
7571
7572         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7573                                           nft_flowtable_hook_policy, NULL);
7574         if (err < 0)
7575                 return err;
7576
7577         if (add) {
7578                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7579                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7580                         return -EINVAL;
7581
7582                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7583                 if (hooknum != NF_NETDEV_INGRESS)
7584                         return -EOPNOTSUPP;
7585
7586                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7587
7588                 flowtable_hook->priority        = priority;
7589                 flowtable_hook->num             = hooknum;
7590         } else {
7591                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7592                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7593                         if (hooknum != flowtable->hooknum)
7594                                 return -EOPNOTSUPP;
7595                 }
7596
7597                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7598                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7599                         if (priority != flowtable->data.priority)
7600                                 return -EOPNOTSUPP;
7601                 }
7602
7603                 flowtable_hook->priority        = flowtable->data.priority;
7604                 flowtable_hook->num             = flowtable->hooknum;
7605         }
7606
7607         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7608                 err = nf_tables_parse_netdev_hooks(ctx->net,
7609                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7610                                                    &flowtable_hook->list);
7611                 if (err < 0)
7612                         return err;
7613         }
7614
7615         list_for_each_entry(hook, &flowtable_hook->list, list) {
7616                 hook->ops.pf            = NFPROTO_NETDEV;
7617                 hook->ops.hooknum       = flowtable_hook->num;
7618                 hook->ops.priority      = flowtable_hook->priority;
7619                 hook->ops.priv          = &flowtable->data;
7620                 hook->ops.hook          = flowtable->data.type->hook;
7621         }
7622
7623         return err;
7624 }
7625
7626 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7627 {
7628         const struct nf_flowtable_type *type;
7629
7630         list_for_each_entry(type, &nf_tables_flowtables, list) {
7631                 if (family == type->family)
7632                         return type;
7633         }
7634         return NULL;
7635 }
7636
7637 static const struct nf_flowtable_type *
7638 nft_flowtable_type_get(struct net *net, u8 family)
7639 {
7640         const struct nf_flowtable_type *type;
7641
7642         type = __nft_flowtable_type_get(family);
7643         if (type != NULL && try_module_get(type->owner))
7644                 return type;
7645
7646         lockdep_nfnl_nft_mutex_not_held();
7647 #ifdef CONFIG_MODULES
7648         if (type == NULL) {
7649                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7650                         return ERR_PTR(-EAGAIN);
7651         }
7652 #endif
7653         return ERR_PTR(-ENOENT);
7654 }
7655
7656 /* Only called from error and netdev event paths. */
7657 static void nft_unregister_flowtable_hook(struct net *net,
7658                                           struct nft_flowtable *flowtable,
7659                                           struct nft_hook *hook)
7660 {
7661         nf_unregister_net_hook(net, &hook->ops);
7662         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7663                                     FLOW_BLOCK_UNBIND);
7664 }
7665
7666 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7667                                                  struct list_head *hook_list,
7668                                                  bool release_netdev)
7669 {
7670         struct nft_hook *hook, *next;
7671
7672         list_for_each_entry_safe(hook, next, hook_list, list) {
7673                 nf_unregister_net_hook(net, &hook->ops);
7674                 if (release_netdev) {
7675                         list_del(&hook->list);
7676                         kfree_rcu(hook, rcu);
7677                 }
7678         }
7679 }
7680
7681 static void nft_unregister_flowtable_net_hooks(struct net *net,
7682                                                struct list_head *hook_list)
7683 {
7684         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7685 }
7686
7687 static int nft_register_flowtable_net_hooks(struct net *net,
7688                                             struct nft_table *table,
7689                                             struct list_head *hook_list,
7690                                             struct nft_flowtable *flowtable)
7691 {
7692         struct nft_hook *hook, *hook2, *next;
7693         struct nft_flowtable *ft;
7694         int err, i = 0;
7695
7696         list_for_each_entry(hook, hook_list, list) {
7697                 list_for_each_entry(ft, &table->flowtables, list) {
7698                         if (!nft_is_active_next(net, ft))
7699                                 continue;
7700
7701                         list_for_each_entry(hook2, &ft->hook_list, list) {
7702                                 if (hook->ops.dev == hook2->ops.dev &&
7703                                     hook->ops.pf == hook2->ops.pf) {
7704                                         err = -EEXIST;
7705                                         goto err_unregister_net_hooks;
7706                                 }
7707                         }
7708                 }
7709
7710                 err = flowtable->data.type->setup(&flowtable->data,
7711                                                   hook->ops.dev,
7712                                                   FLOW_BLOCK_BIND);
7713                 if (err < 0)
7714                         goto err_unregister_net_hooks;
7715
7716                 err = nf_register_net_hook(net, &hook->ops);
7717                 if (err < 0) {
7718                         flowtable->data.type->setup(&flowtable->data,
7719                                                     hook->ops.dev,
7720                                                     FLOW_BLOCK_UNBIND);
7721                         goto err_unregister_net_hooks;
7722                 }
7723
7724                 i++;
7725         }
7726
7727         return 0;
7728
7729 err_unregister_net_hooks:
7730         list_for_each_entry_safe(hook, next, hook_list, list) {
7731                 if (i-- <= 0)
7732                         break;
7733
7734                 nft_unregister_flowtable_hook(net, flowtable, hook);
7735                 list_del_rcu(&hook->list);
7736                 kfree_rcu(hook, rcu);
7737         }
7738
7739         return err;
7740 }
7741
7742 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7743 {
7744         struct nft_hook *hook, *next;
7745
7746         list_for_each_entry_safe(hook, next, hook_list, list) {
7747                 list_del_rcu(&hook->list);
7748                 kfree_rcu(hook, rcu);
7749         }
7750 }
7751
7752 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7753                                 struct nft_flowtable *flowtable)
7754 {
7755         const struct nlattr * const *nla = ctx->nla;
7756         struct nft_flowtable_hook flowtable_hook;
7757         struct nft_hook *hook, *next;
7758         struct nft_trans *trans;
7759         bool unregister = false;
7760         u32 flags;
7761         int err;
7762
7763         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7764                                        &flowtable_hook, flowtable, false);
7765         if (err < 0)
7766                 return err;
7767
7768         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7769                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7770                         list_del(&hook->list);
7771                         kfree(hook);
7772                 }
7773         }
7774
7775         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7776                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7777                 if (flags & ~NFT_FLOWTABLE_MASK) {
7778                         err = -EOPNOTSUPP;
7779                         goto err_flowtable_update_hook;
7780                 }
7781                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7782                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7783                         err = -EOPNOTSUPP;
7784                         goto err_flowtable_update_hook;
7785                 }
7786         } else {
7787                 flags = flowtable->data.flags;
7788         }
7789
7790         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7791                                                &flowtable_hook.list, flowtable);
7792         if (err < 0)
7793                 goto err_flowtable_update_hook;
7794
7795         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7796                                 sizeof(struct nft_trans_flowtable));
7797         if (!trans) {
7798                 unregister = true;
7799                 err = -ENOMEM;
7800                 goto err_flowtable_update_hook;
7801         }
7802
7803         nft_trans_flowtable_flags(trans) = flags;
7804         nft_trans_flowtable(trans) = flowtable;
7805         nft_trans_flowtable_update(trans) = true;
7806         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7807         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7808
7809         nft_trans_commit_list_add_tail(ctx->net, trans);
7810
7811         return 0;
7812
7813 err_flowtable_update_hook:
7814         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7815                 if (unregister)
7816                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7817                 list_del_rcu(&hook->list);
7818                 kfree_rcu(hook, rcu);
7819         }
7820
7821         return err;
7822
7823 }
7824
7825 static int nf_tables_newflowtable(struct sk_buff *skb,
7826                                   const struct nfnl_info *info,
7827                                   const struct nlattr * const nla[])
7828 {
7829         struct netlink_ext_ack *extack = info->extack;
7830         struct nft_flowtable_hook flowtable_hook;
7831         u8 genmask = nft_genmask_next(info->net);
7832         u8 family = info->nfmsg->nfgen_family;
7833         const struct nf_flowtable_type *type;
7834         struct nft_flowtable *flowtable;
7835         struct nft_hook *hook, *next;
7836         struct net *net = info->net;
7837         struct nft_table *table;
7838         struct nft_ctx ctx;
7839         int err;
7840
7841         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7842             !nla[NFTA_FLOWTABLE_NAME] ||
7843             !nla[NFTA_FLOWTABLE_HOOK])
7844                 return -EINVAL;
7845
7846         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7847                                  genmask, NETLINK_CB(skb).portid);
7848         if (IS_ERR(table)) {
7849                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7850                 return PTR_ERR(table);
7851         }
7852
7853         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7854                                          genmask);
7855         if (IS_ERR(flowtable)) {
7856                 err = PTR_ERR(flowtable);
7857                 if (err != -ENOENT) {
7858                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7859                         return err;
7860                 }
7861         } else {
7862                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7863                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7864                         return -EEXIST;
7865                 }
7866
7867                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7868
7869                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7870         }
7871
7872         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7873
7874         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7875         if (!flowtable)
7876                 return -ENOMEM;
7877
7878         flowtable->table = table;
7879         flowtable->handle = nf_tables_alloc_handle(table);
7880         INIT_LIST_HEAD(&flowtable->hook_list);
7881
7882         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7883         if (!flowtable->name) {
7884                 err = -ENOMEM;
7885                 goto err1;
7886         }
7887
7888         type = nft_flowtable_type_get(net, family);
7889         if (IS_ERR(type)) {
7890                 err = PTR_ERR(type);
7891                 goto err2;
7892         }
7893
7894         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7895                 flowtable->data.flags =
7896                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7897                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7898                         err = -EOPNOTSUPP;
7899                         goto err3;
7900                 }
7901         }
7902
7903         write_pnet(&flowtable->data.net, net);
7904         flowtable->data.type = type;
7905         err = type->init(&flowtable->data);
7906         if (err < 0)
7907                 goto err3;
7908
7909         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7910                                        &flowtable_hook, flowtable, true);
7911         if (err < 0)
7912                 goto err4;
7913
7914         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7915         flowtable->data.priority = flowtable_hook.priority;
7916         flowtable->hooknum = flowtable_hook.num;
7917
7918         err = nft_register_flowtable_net_hooks(ctx.net, table,
7919                                                &flowtable->hook_list,
7920                                                flowtable);
7921         if (err < 0) {
7922                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7923                 goto err4;
7924         }
7925
7926         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7927         if (err < 0)
7928                 goto err5;
7929
7930         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7931         table->use++;
7932
7933         return 0;
7934 err5:
7935         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7936                 nft_unregister_flowtable_hook(net, flowtable, hook);
7937                 list_del_rcu(&hook->list);
7938                 kfree_rcu(hook, rcu);
7939         }
7940 err4:
7941         flowtable->data.type->free(&flowtable->data);
7942 err3:
7943         module_put(type->owner);
7944 err2:
7945         kfree(flowtable->name);
7946 err1:
7947         kfree(flowtable);
7948         return err;
7949 }
7950
7951 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7952 {
7953         struct nft_hook *this, *next;
7954
7955         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7956                 list_del(&this->list);
7957                 kfree(this);
7958         }
7959 }
7960
7961 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7962                                  struct nft_flowtable *flowtable)
7963 {
7964         const struct nlattr * const *nla = ctx->nla;
7965         struct nft_flowtable_hook flowtable_hook;
7966         LIST_HEAD(flowtable_del_list);
7967         struct nft_hook *this, *hook;
7968         struct nft_trans *trans;
7969         int err;
7970
7971         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7972                                        &flowtable_hook, flowtable, false);
7973         if (err < 0)
7974                 return err;
7975
7976         list_for_each_entry(this, &flowtable_hook.list, list) {
7977                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7978                 if (!hook) {
7979                         err = -ENOENT;
7980                         goto err_flowtable_del_hook;
7981                 }
7982                 list_move(&hook->list, &flowtable_del_list);
7983         }
7984
7985         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7986                                 sizeof(struct nft_trans_flowtable));
7987         if (!trans) {
7988                 err = -ENOMEM;
7989                 goto err_flowtable_del_hook;
7990         }
7991
7992         nft_trans_flowtable(trans) = flowtable;
7993         nft_trans_flowtable_update(trans) = true;
7994         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7995         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7996         nft_flowtable_hook_release(&flowtable_hook);
7997
7998         nft_trans_commit_list_add_tail(ctx->net, trans);
7999
8000         return 0;
8001
8002 err_flowtable_del_hook:
8003         list_splice(&flowtable_del_list, &flowtable->hook_list);
8004         nft_flowtable_hook_release(&flowtable_hook);
8005
8006         return err;
8007 }
8008
8009 static int nf_tables_delflowtable(struct sk_buff *skb,
8010                                   const struct nfnl_info *info,
8011                                   const struct nlattr * const nla[])
8012 {
8013         struct netlink_ext_ack *extack = info->extack;
8014         u8 genmask = nft_genmask_next(info->net);
8015         u8 family = info->nfmsg->nfgen_family;
8016         struct nft_flowtable *flowtable;
8017         struct net *net = info->net;
8018         const struct nlattr *attr;
8019         struct nft_table *table;
8020         struct nft_ctx ctx;
8021
8022         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8023             (!nla[NFTA_FLOWTABLE_NAME] &&
8024              !nla[NFTA_FLOWTABLE_HANDLE]))
8025                 return -EINVAL;
8026
8027         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8028                                  genmask, NETLINK_CB(skb).portid);
8029         if (IS_ERR(table)) {
8030                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8031                 return PTR_ERR(table);
8032         }
8033
8034         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8035                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8036                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8037         } else {
8038                 attr = nla[NFTA_FLOWTABLE_NAME];
8039                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8040         }
8041
8042         if (IS_ERR(flowtable)) {
8043                 if (PTR_ERR(flowtable) == -ENOENT &&
8044                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8045                         return 0;
8046
8047                 NL_SET_BAD_ATTR(extack, attr);
8048                 return PTR_ERR(flowtable);
8049         }
8050
8051         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8052
8053         if (nla[NFTA_FLOWTABLE_HOOK])
8054                 return nft_delflowtable_hook(&ctx, flowtable);
8055
8056         if (flowtable->use > 0) {
8057                 NL_SET_BAD_ATTR(extack, attr);
8058                 return -EBUSY;
8059         }
8060
8061         return nft_delflowtable(&ctx, flowtable);
8062 }
8063
8064 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8065                                          u32 portid, u32 seq, int event,
8066                                          u32 flags, int family,
8067                                          struct nft_flowtable *flowtable,
8068                                          struct list_head *hook_list)
8069 {
8070         struct nlattr *nest, *nest_devs;
8071         struct nft_hook *hook;
8072         struct nlmsghdr *nlh;
8073
8074         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8075         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8076                            NFNETLINK_V0, nft_base_seq(net));
8077         if (!nlh)
8078                 goto nla_put_failure;
8079
8080         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8081             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8082             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8083             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8084                          NFTA_FLOWTABLE_PAD) ||
8085             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8086                 goto nla_put_failure;
8087
8088         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8089         if (!nest)
8090                 goto nla_put_failure;
8091         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8092             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8093                 goto nla_put_failure;
8094
8095         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8096         if (!nest_devs)
8097                 goto nla_put_failure;
8098
8099         list_for_each_entry_rcu(hook, hook_list, list) {
8100                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8101                         goto nla_put_failure;
8102         }
8103         nla_nest_end(skb, nest_devs);
8104         nla_nest_end(skb, nest);
8105
8106         nlmsg_end(skb, nlh);
8107         return 0;
8108
8109 nla_put_failure:
8110         nlmsg_trim(skb, nlh);
8111         return -1;
8112 }
8113
8114 struct nft_flowtable_filter {
8115         char            *table;
8116 };
8117
8118 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8119                                     struct netlink_callback *cb)
8120 {
8121         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8122         struct nft_flowtable_filter *filter = cb->data;
8123         unsigned int idx = 0, s_idx = cb->args[0];
8124         struct net *net = sock_net(skb->sk);
8125         int family = nfmsg->nfgen_family;
8126         struct nft_flowtable *flowtable;
8127         struct nftables_pernet *nft_net;
8128         const struct nft_table *table;
8129
8130         rcu_read_lock();
8131         nft_net = nft_pernet(net);
8132         cb->seq = READ_ONCE(nft_net->base_seq);
8133
8134         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8135                 if (family != NFPROTO_UNSPEC && family != table->family)
8136                         continue;
8137
8138                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8139                         if (!nft_is_active(net, flowtable))
8140                                 goto cont;
8141                         if (idx < s_idx)
8142                                 goto cont;
8143                         if (idx > s_idx)
8144                                 memset(&cb->args[1], 0,
8145                                        sizeof(cb->args) - sizeof(cb->args[0]));
8146                         if (filter && filter->table &&
8147                             strcmp(filter->table, table->name))
8148                                 goto cont;
8149
8150                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8151                                                           cb->nlh->nlmsg_seq,
8152                                                           NFT_MSG_NEWFLOWTABLE,
8153                                                           NLM_F_MULTI | NLM_F_APPEND,
8154                                                           table->family,
8155                                                           flowtable,
8156                                                           &flowtable->hook_list) < 0)
8157                                 goto done;
8158
8159                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8160 cont:
8161                         idx++;
8162                 }
8163         }
8164 done:
8165         rcu_read_unlock();
8166
8167         cb->args[0] = idx;
8168         return skb->len;
8169 }
8170
8171 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8172 {
8173         const struct nlattr * const *nla = cb->data;
8174         struct nft_flowtable_filter *filter = NULL;
8175
8176         if (nla[NFTA_FLOWTABLE_TABLE]) {
8177                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8178                 if (!filter)
8179                         return -ENOMEM;
8180
8181                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8182                                            GFP_ATOMIC);
8183                 if (!filter->table) {
8184                         kfree(filter);
8185                         return -ENOMEM;
8186                 }
8187         }
8188
8189         cb->data = filter;
8190         return 0;
8191 }
8192
8193 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8194 {
8195         struct nft_flowtable_filter *filter = cb->data;
8196
8197         if (!filter)
8198                 return 0;
8199
8200         kfree(filter->table);
8201         kfree(filter);
8202
8203         return 0;
8204 }
8205
8206 /* called with rcu_read_lock held */
8207 static int nf_tables_getflowtable(struct sk_buff *skb,
8208                                   const struct nfnl_info *info,
8209                                   const struct nlattr * const nla[])
8210 {
8211         u8 genmask = nft_genmask_cur(info->net);
8212         u8 family = info->nfmsg->nfgen_family;
8213         struct nft_flowtable *flowtable;
8214         const struct nft_table *table;
8215         struct net *net = info->net;
8216         struct sk_buff *skb2;
8217         int err;
8218
8219         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8220                 struct netlink_dump_control c = {
8221                         .start = nf_tables_dump_flowtable_start,
8222                         .dump = nf_tables_dump_flowtable,
8223                         .done = nf_tables_dump_flowtable_done,
8224                         .module = THIS_MODULE,
8225                         .data = (void *)nla,
8226                 };
8227
8228                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8229         }
8230
8231         if (!nla[NFTA_FLOWTABLE_NAME])
8232                 return -EINVAL;
8233
8234         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8235                                  genmask, 0);
8236         if (IS_ERR(table))
8237                 return PTR_ERR(table);
8238
8239         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8240                                          genmask);
8241         if (IS_ERR(flowtable))
8242                 return PTR_ERR(flowtable);
8243
8244         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8245         if (!skb2)
8246                 return -ENOMEM;
8247
8248         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8249                                             info->nlh->nlmsg_seq,
8250                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8251                                             flowtable, &flowtable->hook_list);
8252         if (err < 0)
8253                 goto err_fill_flowtable_info;
8254
8255         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8256
8257 err_fill_flowtable_info:
8258         kfree_skb(skb2);
8259         return err;
8260 }
8261
8262 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8263                                        struct nft_flowtable *flowtable,
8264                                        struct list_head *hook_list,
8265                                        int event)
8266 {
8267         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8268         struct sk_buff *skb;
8269         u16 flags = 0;
8270         int err;
8271
8272         if (!ctx->report &&
8273             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8274                 return;
8275
8276         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8277         if (skb == NULL)
8278                 goto err;
8279
8280         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8281                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8282
8283         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8284                                             ctx->seq, event, flags,
8285                                             ctx->family, flowtable, hook_list);
8286         if (err < 0) {
8287                 kfree_skb(skb);
8288                 goto err;
8289         }
8290
8291         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8292         return;
8293 err:
8294         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8295 }
8296
8297 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8298 {
8299         struct nft_hook *hook, *next;
8300
8301         flowtable->data.type->free(&flowtable->data);
8302         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8303                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8304                                             FLOW_BLOCK_UNBIND);
8305                 list_del_rcu(&hook->list);
8306                 kfree(hook);
8307         }
8308         kfree(flowtable->name);
8309         module_put(flowtable->data.type->owner);
8310         kfree(flowtable);
8311 }
8312
8313 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8314                                    u32 portid, u32 seq)
8315 {
8316         struct nftables_pernet *nft_net = nft_pernet(net);
8317         struct nlmsghdr *nlh;
8318         char buf[TASK_COMM_LEN];
8319         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8320
8321         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8322                            NFNETLINK_V0, nft_base_seq(net));
8323         if (!nlh)
8324                 goto nla_put_failure;
8325
8326         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8327             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8328             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8329                 goto nla_put_failure;
8330
8331         nlmsg_end(skb, nlh);
8332         return 0;
8333
8334 nla_put_failure:
8335         nlmsg_trim(skb, nlh);
8336         return -EMSGSIZE;
8337 }
8338
8339 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8340                                 struct nft_flowtable *flowtable)
8341 {
8342         struct nft_hook *hook;
8343
8344         list_for_each_entry(hook, &flowtable->hook_list, list) {
8345                 if (hook->ops.dev != dev)
8346                         continue;
8347
8348                 /* flow_offload_netdev_event() cleans up entries for us. */
8349                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8350                 list_del_rcu(&hook->list);
8351                 kfree_rcu(hook, rcu);
8352                 break;
8353         }
8354 }
8355
8356 static int nf_tables_flowtable_event(struct notifier_block *this,
8357                                      unsigned long event, void *ptr)
8358 {
8359         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8360         struct nft_flowtable *flowtable;
8361         struct nftables_pernet *nft_net;
8362         struct nft_table *table;
8363         struct net *net;
8364
8365         if (event != NETDEV_UNREGISTER)
8366                 return 0;
8367
8368         net = dev_net(dev);
8369         nft_net = nft_pernet(net);
8370         mutex_lock(&nft_net->commit_mutex);
8371         list_for_each_entry(table, &nft_net->tables, list) {
8372                 list_for_each_entry(flowtable, &table->flowtables, list) {
8373                         nft_flowtable_event(event, dev, flowtable);
8374                 }
8375         }
8376         mutex_unlock(&nft_net->commit_mutex);
8377
8378         return NOTIFY_DONE;
8379 }
8380
8381 static struct notifier_block nf_tables_flowtable_notifier = {
8382         .notifier_call  = nf_tables_flowtable_event,
8383 };
8384
8385 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8386                                  int event)
8387 {
8388         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8389         struct sk_buff *skb2;
8390         int err;
8391
8392         if (!nlmsg_report(nlh) &&
8393             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8394                 return;
8395
8396         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8397         if (skb2 == NULL)
8398                 goto err;
8399
8400         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8401                                       nlh->nlmsg_seq);
8402         if (err < 0) {
8403                 kfree_skb(skb2);
8404                 goto err;
8405         }
8406
8407         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8408                        nlmsg_report(nlh), GFP_KERNEL);
8409         return;
8410 err:
8411         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8412                           -ENOBUFS);
8413 }
8414
8415 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8416                             const struct nlattr * const nla[])
8417 {
8418         struct sk_buff *skb2;
8419         int err;
8420
8421         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8422         if (skb2 == NULL)
8423                 return -ENOMEM;
8424
8425         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8426                                       info->nlh->nlmsg_seq);
8427         if (err < 0)
8428                 goto err_fill_gen_info;
8429
8430         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8431
8432 err_fill_gen_info:
8433         kfree_skb(skb2);
8434         return err;
8435 }
8436
8437 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8438         [NFT_MSG_NEWTABLE] = {
8439                 .call           = nf_tables_newtable,
8440                 .type           = NFNL_CB_BATCH,
8441                 .attr_count     = NFTA_TABLE_MAX,
8442                 .policy         = nft_table_policy,
8443         },
8444         [NFT_MSG_GETTABLE] = {
8445                 .call           = nf_tables_gettable,
8446                 .type           = NFNL_CB_RCU,
8447                 .attr_count     = NFTA_TABLE_MAX,
8448                 .policy         = nft_table_policy,
8449         },
8450         [NFT_MSG_DELTABLE] = {
8451                 .call           = nf_tables_deltable,
8452                 .type           = NFNL_CB_BATCH,
8453                 .attr_count     = NFTA_TABLE_MAX,
8454                 .policy         = nft_table_policy,
8455         },
8456         [NFT_MSG_DESTROYTABLE] = {
8457                 .call           = nf_tables_deltable,
8458                 .type           = NFNL_CB_BATCH,
8459                 .attr_count     = NFTA_TABLE_MAX,
8460                 .policy         = nft_table_policy,
8461         },
8462         [NFT_MSG_NEWCHAIN] = {
8463                 .call           = nf_tables_newchain,
8464                 .type           = NFNL_CB_BATCH,
8465                 .attr_count     = NFTA_CHAIN_MAX,
8466                 .policy         = nft_chain_policy,
8467         },
8468         [NFT_MSG_GETCHAIN] = {
8469                 .call           = nf_tables_getchain,
8470                 .type           = NFNL_CB_RCU,
8471                 .attr_count     = NFTA_CHAIN_MAX,
8472                 .policy         = nft_chain_policy,
8473         },
8474         [NFT_MSG_DELCHAIN] = {
8475                 .call           = nf_tables_delchain,
8476                 .type           = NFNL_CB_BATCH,
8477                 .attr_count     = NFTA_CHAIN_MAX,
8478                 .policy         = nft_chain_policy,
8479         },
8480         [NFT_MSG_DESTROYCHAIN] = {
8481                 .call           = nf_tables_delchain,
8482                 .type           = NFNL_CB_BATCH,
8483                 .attr_count     = NFTA_CHAIN_MAX,
8484                 .policy         = nft_chain_policy,
8485         },
8486         [NFT_MSG_NEWRULE] = {
8487                 .call           = nf_tables_newrule,
8488                 .type           = NFNL_CB_BATCH,
8489                 .attr_count     = NFTA_RULE_MAX,
8490                 .policy         = nft_rule_policy,
8491         },
8492         [NFT_MSG_GETRULE] = {
8493                 .call           = nf_tables_getrule,
8494                 .type           = NFNL_CB_RCU,
8495                 .attr_count     = NFTA_RULE_MAX,
8496                 .policy         = nft_rule_policy,
8497         },
8498         [NFT_MSG_GETRULE_RESET] = {
8499                 .call           = nf_tables_getrule,
8500                 .type           = NFNL_CB_RCU,
8501                 .attr_count     = NFTA_RULE_MAX,
8502                 .policy         = nft_rule_policy,
8503         },
8504         [NFT_MSG_DELRULE] = {
8505                 .call           = nf_tables_delrule,
8506                 .type           = NFNL_CB_BATCH,
8507                 .attr_count     = NFTA_RULE_MAX,
8508                 .policy         = nft_rule_policy,
8509         },
8510         [NFT_MSG_DESTROYRULE] = {
8511                 .call           = nf_tables_delrule,
8512                 .type           = NFNL_CB_BATCH,
8513                 .attr_count     = NFTA_RULE_MAX,
8514                 .policy         = nft_rule_policy,
8515         },
8516         [NFT_MSG_NEWSET] = {
8517                 .call           = nf_tables_newset,
8518                 .type           = NFNL_CB_BATCH,
8519                 .attr_count     = NFTA_SET_MAX,
8520                 .policy         = nft_set_policy,
8521         },
8522         [NFT_MSG_GETSET] = {
8523                 .call           = nf_tables_getset,
8524                 .type           = NFNL_CB_RCU,
8525                 .attr_count     = NFTA_SET_MAX,
8526                 .policy         = nft_set_policy,
8527         },
8528         [NFT_MSG_DELSET] = {
8529                 .call           = nf_tables_delset,
8530                 .type           = NFNL_CB_BATCH,
8531                 .attr_count     = NFTA_SET_MAX,
8532                 .policy         = nft_set_policy,
8533         },
8534         [NFT_MSG_DESTROYSET] = {
8535                 .call           = nf_tables_delset,
8536                 .type           = NFNL_CB_BATCH,
8537                 .attr_count     = NFTA_SET_MAX,
8538                 .policy         = nft_set_policy,
8539         },
8540         [NFT_MSG_NEWSETELEM] = {
8541                 .call           = nf_tables_newsetelem,
8542                 .type           = NFNL_CB_BATCH,
8543                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8544                 .policy         = nft_set_elem_list_policy,
8545         },
8546         [NFT_MSG_GETSETELEM] = {
8547                 .call           = nf_tables_getsetelem,
8548                 .type           = NFNL_CB_RCU,
8549                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8550                 .policy         = nft_set_elem_list_policy,
8551         },
8552         [NFT_MSG_DELSETELEM] = {
8553                 .call           = nf_tables_delsetelem,
8554                 .type           = NFNL_CB_BATCH,
8555                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8556                 .policy         = nft_set_elem_list_policy,
8557         },
8558         [NFT_MSG_DESTROYSETELEM] = {
8559                 .call           = nf_tables_delsetelem,
8560                 .type           = NFNL_CB_BATCH,
8561                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8562                 .policy         = nft_set_elem_list_policy,
8563         },
8564         [NFT_MSG_GETGEN] = {
8565                 .call           = nf_tables_getgen,
8566                 .type           = NFNL_CB_RCU,
8567         },
8568         [NFT_MSG_NEWOBJ] = {
8569                 .call           = nf_tables_newobj,
8570                 .type           = NFNL_CB_BATCH,
8571                 .attr_count     = NFTA_OBJ_MAX,
8572                 .policy         = nft_obj_policy,
8573         },
8574         [NFT_MSG_GETOBJ] = {
8575                 .call           = nf_tables_getobj,
8576                 .type           = NFNL_CB_RCU,
8577                 .attr_count     = NFTA_OBJ_MAX,
8578                 .policy         = nft_obj_policy,
8579         },
8580         [NFT_MSG_DELOBJ] = {
8581                 .call           = nf_tables_delobj,
8582                 .type           = NFNL_CB_BATCH,
8583                 .attr_count     = NFTA_OBJ_MAX,
8584                 .policy         = nft_obj_policy,
8585         },
8586         [NFT_MSG_DESTROYOBJ] = {
8587                 .call           = nf_tables_delobj,
8588                 .type           = NFNL_CB_BATCH,
8589                 .attr_count     = NFTA_OBJ_MAX,
8590                 .policy         = nft_obj_policy,
8591         },
8592         [NFT_MSG_GETOBJ_RESET] = {
8593                 .call           = nf_tables_getobj,
8594                 .type           = NFNL_CB_RCU,
8595                 .attr_count     = NFTA_OBJ_MAX,
8596                 .policy         = nft_obj_policy,
8597         },
8598         [NFT_MSG_NEWFLOWTABLE] = {
8599                 .call           = nf_tables_newflowtable,
8600                 .type           = NFNL_CB_BATCH,
8601                 .attr_count     = NFTA_FLOWTABLE_MAX,
8602                 .policy         = nft_flowtable_policy,
8603         },
8604         [NFT_MSG_GETFLOWTABLE] = {
8605                 .call           = nf_tables_getflowtable,
8606                 .type           = NFNL_CB_RCU,
8607                 .attr_count     = NFTA_FLOWTABLE_MAX,
8608                 .policy         = nft_flowtable_policy,
8609         },
8610         [NFT_MSG_DELFLOWTABLE] = {
8611                 .call           = nf_tables_delflowtable,
8612                 .type           = NFNL_CB_BATCH,
8613                 .attr_count     = NFTA_FLOWTABLE_MAX,
8614                 .policy         = nft_flowtable_policy,
8615         },
8616         [NFT_MSG_DESTROYFLOWTABLE] = {
8617                 .call           = nf_tables_delflowtable,
8618                 .type           = NFNL_CB_BATCH,
8619                 .attr_count     = NFTA_FLOWTABLE_MAX,
8620                 .policy         = nft_flowtable_policy,
8621         },
8622 };
8623
8624 static int nf_tables_validate(struct net *net)
8625 {
8626         struct nftables_pernet *nft_net = nft_pernet(net);
8627         struct nft_table *table;
8628
8629         list_for_each_entry(table, &nft_net->tables, list) {
8630                 switch (table->validate_state) {
8631                 case NFT_VALIDATE_SKIP:
8632                         continue;
8633                 case NFT_VALIDATE_NEED:
8634                         nft_validate_state_update(table, NFT_VALIDATE_DO);
8635                         fallthrough;
8636                 case NFT_VALIDATE_DO:
8637                         if (nft_table_validate(net, table) < 0)
8638                                 return -EAGAIN;
8639
8640                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
8641                 }
8642
8643                 break;
8644         }
8645
8646         return 0;
8647 }
8648
8649 /* a drop policy has to be deferred until all rules have been activated,
8650  * otherwise a large ruleset that contains a drop-policy base chain will
8651  * cause all packets to get dropped until the full transaction has been
8652  * processed.
8653  *
8654  * We defer the drop policy until the transaction has been finalized.
8655  */
8656 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8657 {
8658         struct nft_base_chain *basechain;
8659
8660         if (nft_trans_chain_policy(trans) != NF_DROP)
8661                 return;
8662
8663         if (!nft_is_base_chain(trans->ctx.chain))
8664                 return;
8665
8666         basechain = nft_base_chain(trans->ctx.chain);
8667         basechain->policy = NF_DROP;
8668 }
8669
8670 static void nft_chain_commit_update(struct nft_trans *trans)
8671 {
8672         struct nft_base_chain *basechain;
8673
8674         if (nft_trans_chain_name(trans)) {
8675                 rhltable_remove(&trans->ctx.table->chains_ht,
8676                                 &trans->ctx.chain->rhlhead,
8677                                 nft_chain_ht_params);
8678                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8679                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8680                                     trans->ctx.chain->name,
8681                                     &trans->ctx.chain->rhlhead,
8682                                     nft_chain_ht_params);
8683         }
8684
8685         if (!nft_is_base_chain(trans->ctx.chain))
8686                 return;
8687
8688         nft_chain_stats_replace(trans);
8689
8690         basechain = nft_base_chain(trans->ctx.chain);
8691
8692         switch (nft_trans_chain_policy(trans)) {
8693         case NF_DROP:
8694         case NF_ACCEPT:
8695                 basechain->policy = nft_trans_chain_policy(trans);
8696                 break;
8697         }
8698 }
8699
8700 static void nft_obj_commit_update(struct nft_trans *trans)
8701 {
8702         struct nft_object *newobj;
8703         struct nft_object *obj;
8704
8705         obj = nft_trans_obj(trans);
8706         newobj = nft_trans_obj_newobj(trans);
8707
8708         if (obj->ops->update)
8709                 obj->ops->update(obj, newobj);
8710
8711         nft_obj_destroy(&trans->ctx, newobj);
8712 }
8713
8714 static void nft_commit_release(struct nft_trans *trans)
8715 {
8716         switch (trans->msg_type) {
8717         case NFT_MSG_DELTABLE:
8718         case NFT_MSG_DESTROYTABLE:
8719                 nf_tables_table_destroy(&trans->ctx);
8720                 break;
8721         case NFT_MSG_NEWCHAIN:
8722                 free_percpu(nft_trans_chain_stats(trans));
8723                 kfree(nft_trans_chain_name(trans));
8724                 break;
8725         case NFT_MSG_DELCHAIN:
8726         case NFT_MSG_DESTROYCHAIN:
8727                 nf_tables_chain_destroy(&trans->ctx);
8728                 break;
8729         case NFT_MSG_DELRULE:
8730         case NFT_MSG_DESTROYRULE:
8731                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8732                 break;
8733         case NFT_MSG_DELSET:
8734         case NFT_MSG_DESTROYSET:
8735                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8736                 break;
8737         case NFT_MSG_DELSETELEM:
8738         case NFT_MSG_DESTROYSETELEM:
8739                 nf_tables_set_elem_destroy(&trans->ctx,
8740                                            nft_trans_elem_set(trans),
8741                                            nft_trans_elem(trans).priv);
8742                 break;
8743         case NFT_MSG_DELOBJ:
8744         case NFT_MSG_DESTROYOBJ:
8745                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8746                 break;
8747         case NFT_MSG_DELFLOWTABLE:
8748         case NFT_MSG_DESTROYFLOWTABLE:
8749                 if (nft_trans_flowtable_update(trans))
8750                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8751                 else
8752                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8753                 break;
8754         }
8755
8756         if (trans->put_net)
8757                 put_net(trans->ctx.net);
8758
8759         kfree(trans);
8760 }
8761
8762 static void nf_tables_trans_destroy_work(struct work_struct *w)
8763 {
8764         struct nft_trans *trans, *next;
8765         LIST_HEAD(head);
8766
8767         spin_lock(&nf_tables_destroy_list_lock);
8768         list_splice_init(&nf_tables_destroy_list, &head);
8769         spin_unlock(&nf_tables_destroy_list_lock);
8770
8771         if (list_empty(&head))
8772                 return;
8773
8774         synchronize_rcu();
8775
8776         list_for_each_entry_safe(trans, next, &head, list) {
8777                 list_del(&trans->list);
8778                 nft_commit_release(trans);
8779         }
8780 }
8781
8782 void nf_tables_trans_destroy_flush_work(void)
8783 {
8784         flush_work(&trans_destroy_work);
8785 }
8786 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8787
8788 static bool nft_expr_reduce(struct nft_regs_track *track,
8789                             const struct nft_expr *expr)
8790 {
8791         return false;
8792 }
8793
8794 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8795 {
8796         const struct nft_expr *expr, *last;
8797         struct nft_regs_track track = {};
8798         unsigned int size, data_size;
8799         void *data, *data_boundary;
8800         struct nft_rule_dp *prule;
8801         struct nft_rule *rule;
8802
8803         /* already handled or inactive chain? */
8804         if (chain->blob_next || !nft_is_active_next(net, chain))
8805                 return 0;
8806
8807         data_size = 0;
8808         list_for_each_entry(rule, &chain->rules, list) {
8809                 if (nft_is_active_next(net, rule)) {
8810                         data_size += sizeof(*prule) + rule->dlen;
8811                         if (data_size > INT_MAX)
8812                                 return -ENOMEM;
8813                 }
8814         }
8815
8816         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
8817         if (!chain->blob_next)
8818                 return -ENOMEM;
8819
8820         data = (void *)chain->blob_next->data;
8821         data_boundary = data + data_size;
8822         size = 0;
8823
8824         list_for_each_entry(rule, &chain->rules, list) {
8825                 if (!nft_is_active_next(net, rule))
8826                         continue;
8827
8828                 prule = (struct nft_rule_dp *)data;
8829                 data += offsetof(struct nft_rule_dp, data);
8830                 if (WARN_ON_ONCE(data > data_boundary))
8831                         return -ENOMEM;
8832
8833                 size = 0;
8834                 track.last = nft_expr_last(rule);
8835                 nft_rule_for_each_expr(expr, last, rule) {
8836                         track.cur = expr;
8837
8838                         if (nft_expr_reduce(&track, expr)) {
8839                                 expr = track.cur;
8840                                 continue;
8841                         }
8842
8843                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8844                                 return -ENOMEM;
8845
8846                         memcpy(data + size, expr, expr->ops->size);
8847                         size += expr->ops->size;
8848                 }
8849                 if (WARN_ON_ONCE(size >= 1 << 12))
8850                         return -ENOMEM;
8851
8852                 prule->handle = rule->handle;
8853                 prule->dlen = size;
8854                 prule->is_last = 0;
8855
8856                 data += size;
8857                 size = 0;
8858                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8859         }
8860
8861         if (WARN_ON_ONCE(data > data_boundary))
8862                 return -ENOMEM;
8863
8864         prule = (struct nft_rule_dp *)data;
8865         nft_last_rule(chain, prule);
8866
8867         return 0;
8868 }
8869
8870 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8871 {
8872         struct nftables_pernet *nft_net = nft_pernet(net);
8873         struct nft_trans *trans, *next;
8874
8875         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8876                 struct nft_chain *chain = trans->ctx.chain;
8877
8878                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8879                     trans->msg_type == NFT_MSG_DELRULE) {
8880                         kvfree(chain->blob_next);
8881                         chain->blob_next = NULL;
8882                 }
8883         }
8884 }
8885
8886 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
8887 {
8888         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
8889
8890         kvfree(l->blob);
8891 }
8892
8893 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8894 {
8895         struct nft_rule_dp_last *last;
8896
8897         /* last rule trailer is after end marker */
8898         last = (void *)blob + sizeof(*blob) + blob->size;
8899         last->blob = blob;
8900
8901         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
8902 }
8903
8904 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8905 {
8906         struct nft_rule_blob *g0, *g1;
8907         bool next_genbit;
8908
8909         next_genbit = nft_gencursor_next(net);
8910
8911         g0 = rcu_dereference_protected(chain->blob_gen_0,
8912                                        lockdep_commit_lock_is_held(net));
8913         g1 = rcu_dereference_protected(chain->blob_gen_1,
8914                                        lockdep_commit_lock_is_held(net));
8915
8916         /* No changes to this chain? */
8917         if (chain->blob_next == NULL) {
8918                 /* chain had no change in last or next generation */
8919                 if (g0 == g1)
8920                         return;
8921                 /*
8922                  * chain had no change in this generation; make sure next
8923                  * one uses same rules as current generation.
8924                  */
8925                 if (next_genbit) {
8926                         rcu_assign_pointer(chain->blob_gen_1, g0);
8927                         nf_tables_commit_chain_free_rules_old(g1);
8928                 } else {
8929                         rcu_assign_pointer(chain->blob_gen_0, g1);
8930                         nf_tables_commit_chain_free_rules_old(g0);
8931                 }
8932
8933                 return;
8934         }
8935
8936         if (next_genbit)
8937                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8938         else
8939                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8940
8941         chain->blob_next = NULL;
8942
8943         if (g0 == g1)
8944                 return;
8945
8946         if (next_genbit)
8947                 nf_tables_commit_chain_free_rules_old(g1);
8948         else
8949                 nf_tables_commit_chain_free_rules_old(g0);
8950 }
8951
8952 static void nft_obj_del(struct nft_object *obj)
8953 {
8954         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8955         list_del_rcu(&obj->list);
8956 }
8957
8958 void nft_chain_del(struct nft_chain *chain)
8959 {
8960         struct nft_table *table = chain->table;
8961
8962         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8963                                      nft_chain_ht_params));
8964         list_del_rcu(&chain->list);
8965 }
8966
8967 static void nf_tables_module_autoload_cleanup(struct net *net)
8968 {
8969         struct nftables_pernet *nft_net = nft_pernet(net);
8970         struct nft_module_request *req, *next;
8971
8972         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8973         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8974                 WARN_ON_ONCE(!req->done);
8975                 list_del(&req->list);
8976                 kfree(req);
8977         }
8978 }
8979
8980 static void nf_tables_commit_release(struct net *net)
8981 {
8982         struct nftables_pernet *nft_net = nft_pernet(net);
8983         struct nft_trans *trans;
8984
8985         /* all side effects have to be made visible.
8986          * For example, if a chain named 'foo' has been deleted, a
8987          * new transaction must not find it anymore.
8988          *
8989          * Memory reclaim happens asynchronously from work queue
8990          * to prevent expensive synchronize_rcu() in commit phase.
8991          */
8992         if (list_empty(&nft_net->commit_list)) {
8993                 nf_tables_module_autoload_cleanup(net);
8994                 mutex_unlock(&nft_net->commit_mutex);
8995                 return;
8996         }
8997
8998         trans = list_last_entry(&nft_net->commit_list,
8999                                 struct nft_trans, list);
9000         get_net(trans->ctx.net);
9001         WARN_ON_ONCE(trans->put_net);
9002
9003         trans->put_net = true;
9004         spin_lock(&nf_tables_destroy_list_lock);
9005         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9006         spin_unlock(&nf_tables_destroy_list_lock);
9007
9008         nf_tables_module_autoload_cleanup(net);
9009         schedule_work(&trans_destroy_work);
9010
9011         mutex_unlock(&nft_net->commit_mutex);
9012 }
9013
9014 static void nft_commit_notify(struct net *net, u32 portid)
9015 {
9016         struct nftables_pernet *nft_net = nft_pernet(net);
9017         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9018         unsigned char *data;
9019         int len;
9020
9021         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9022                 if (!batch_skb) {
9023 new_batch:
9024                         batch_skb = skb;
9025                         len = NLMSG_GOODSIZE - skb->len;
9026                         list_del(&skb->list);
9027                         continue;
9028                 }
9029                 len -= skb->len;
9030                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9031                         data = skb_put(batch_skb, skb->len);
9032                         memcpy(data, skb->data, skb->len);
9033                         list_del(&skb->list);
9034                         kfree_skb(skb);
9035                         continue;
9036                 }
9037                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9038                                NFT_CB(batch_skb).report, GFP_KERNEL);
9039                 goto new_batch;
9040         }
9041
9042         if (batch_skb) {
9043                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9044                                NFT_CB(batch_skb).report, GFP_KERNEL);
9045         }
9046
9047         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9048 }
9049
9050 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9051                                         struct nft_table *table)
9052 {
9053         struct nft_audit_data *adp;
9054
9055         list_for_each_entry(adp, adl, list) {
9056                 if (adp->table == table)
9057                         return 0;
9058         }
9059         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9060         if (!adp)
9061                 return -ENOMEM;
9062         adp->table = table;
9063         list_add(&adp->list, adl);
9064         return 0;
9065 }
9066
9067 static void nf_tables_commit_audit_free(struct list_head *adl)
9068 {
9069         struct nft_audit_data *adp, *adn;
9070
9071         list_for_each_entry_safe(adp, adn, adl, list) {
9072                 list_del(&adp->list);
9073                 kfree(adp);
9074         }
9075 }
9076
9077 static void nf_tables_commit_audit_collect(struct list_head *adl,
9078                                            struct nft_table *table, u32 op)
9079 {
9080         struct nft_audit_data *adp;
9081
9082         list_for_each_entry(adp, adl, list) {
9083                 if (adp->table == table)
9084                         goto found;
9085         }
9086         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9087         return;
9088 found:
9089         adp->entries++;
9090         if (!adp->op || adp->op > op)
9091                 adp->op = op;
9092 }
9093
9094 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9095
9096 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9097 {
9098         struct nft_audit_data *adp, *adn;
9099         char aubuf[AUNFTABLENAMELEN];
9100
9101         list_for_each_entry_safe(adp, adn, adl, list) {
9102                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9103                          generation);
9104                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9105                                 nft2audit_op[adp->op], GFP_KERNEL);
9106                 list_del(&adp->list);
9107                 kfree(adp);
9108         }
9109 }
9110
9111 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9112 {
9113         struct nftables_pernet *nft_net = nft_pernet(net);
9114         struct nft_trans *trans, *next;
9115         struct nft_trans_elem *te;
9116         struct nft_chain *chain;
9117         struct nft_table *table;
9118         unsigned int base_seq;
9119         LIST_HEAD(adl);
9120         int err;
9121
9122         if (list_empty(&nft_net->commit_list)) {
9123                 mutex_unlock(&nft_net->commit_mutex);
9124                 return 0;
9125         }
9126
9127         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9128         if (nf_tables_validate(net) < 0)
9129                 return -EAGAIN;
9130
9131         err = nft_flow_rule_offload_commit(net);
9132         if (err < 0)
9133                 return err;
9134
9135         /* 1.  Allocate space for next generation rules_gen_X[] */
9136         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9137                 int ret;
9138
9139                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9140                 if (ret) {
9141                         nf_tables_commit_chain_prepare_cancel(net);
9142                         nf_tables_commit_audit_free(&adl);
9143                         return ret;
9144                 }
9145                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9146                     trans->msg_type == NFT_MSG_DELRULE) {
9147                         chain = trans->ctx.chain;
9148
9149                         ret = nf_tables_commit_chain_prepare(net, chain);
9150                         if (ret < 0) {
9151                                 nf_tables_commit_chain_prepare_cancel(net);
9152                                 nf_tables_commit_audit_free(&adl);
9153                                 return ret;
9154                         }
9155                 }
9156         }
9157
9158         /* step 2.  Make rules_gen_X visible to packet path */
9159         list_for_each_entry(table, &nft_net->tables, list) {
9160                 list_for_each_entry(chain, &table->chains, list)
9161                         nf_tables_commit_chain(net, chain);
9162         }
9163
9164         /*
9165          * Bump generation counter, invalidate any dump in progress.
9166          * Cannot fail after this point.
9167          */
9168         base_seq = READ_ONCE(nft_net->base_seq);
9169         while (++base_seq == 0)
9170                 ;
9171
9172         WRITE_ONCE(nft_net->base_seq, base_seq);
9173
9174         /* step 3. Start new generation, rules_gen_X now in use. */
9175         net->nft.gencursor = nft_gencursor_next(net);
9176
9177         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9178                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9179                                                trans->msg_type);
9180                 switch (trans->msg_type) {
9181                 case NFT_MSG_NEWTABLE:
9182                         if (nft_trans_table_update(trans)) {
9183                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9184                                         nft_trans_destroy(trans);
9185                                         break;
9186                                 }
9187                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9188                                         nf_tables_table_disable(net, trans->ctx.table);
9189
9190                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9191                         } else {
9192                                 nft_clear(net, trans->ctx.table);
9193                         }
9194                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9195                         nft_trans_destroy(trans);
9196                         break;
9197                 case NFT_MSG_DELTABLE:
9198                 case NFT_MSG_DESTROYTABLE:
9199                         list_del_rcu(&trans->ctx.table->list);
9200                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
9201                         break;
9202                 case NFT_MSG_NEWCHAIN:
9203                         if (nft_trans_chain_update(trans)) {
9204                                 nft_chain_commit_update(trans);
9205                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9206                                 /* trans destroyed after rcu grace period */
9207                         } else {
9208                                 nft_chain_commit_drop_policy(trans);
9209                                 nft_clear(net, trans->ctx.chain);
9210                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9211                                 nft_trans_destroy(trans);
9212                         }
9213                         break;
9214                 case NFT_MSG_DELCHAIN:
9215                 case NFT_MSG_DESTROYCHAIN:
9216                         nft_chain_del(trans->ctx.chain);
9217                         nf_tables_chain_notify(&trans->ctx, trans->msg_type);
9218                         nf_tables_unregister_hook(trans->ctx.net,
9219                                                   trans->ctx.table,
9220                                                   trans->ctx.chain);
9221                         break;
9222                 case NFT_MSG_NEWRULE:
9223                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9224                         nf_tables_rule_notify(&trans->ctx,
9225                                               nft_trans_rule(trans),
9226                                               NFT_MSG_NEWRULE);
9227                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9228                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9229
9230                         nft_trans_destroy(trans);
9231                         break;
9232                 case NFT_MSG_DELRULE:
9233                 case NFT_MSG_DESTROYRULE:
9234                         list_del_rcu(&nft_trans_rule(trans)->list);
9235                         nf_tables_rule_notify(&trans->ctx,
9236                                               nft_trans_rule(trans),
9237                                               trans->msg_type);
9238                         nft_rule_expr_deactivate(&trans->ctx,
9239                                                  nft_trans_rule(trans),
9240                                                  NFT_TRANS_COMMIT);
9241
9242                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9243                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9244                         break;
9245                 case NFT_MSG_NEWSET:
9246                         if (nft_trans_set_update(trans)) {
9247                                 struct nft_set *set = nft_trans_set(trans);
9248
9249                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9250                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9251                         } else {
9252                                 nft_clear(net, nft_trans_set(trans));
9253                                 /* This avoids hitting -EBUSY when deleting the table
9254                                  * from the transaction.
9255                                  */
9256                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9257                                     !list_empty(&nft_trans_set(trans)->bindings))
9258                                         trans->ctx.table->use--;
9259                         }
9260                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9261                                              NFT_MSG_NEWSET, GFP_KERNEL);
9262                         nft_trans_destroy(trans);
9263                         break;
9264                 case NFT_MSG_DELSET:
9265                 case NFT_MSG_DESTROYSET:
9266                         list_del_rcu(&nft_trans_set(trans)->list);
9267                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9268                                              trans->msg_type, GFP_KERNEL);
9269                         break;
9270                 case NFT_MSG_NEWSETELEM:
9271                         te = (struct nft_trans_elem *)trans->data;
9272
9273                         nft_setelem_activate(net, te->set, &te->elem);
9274                         nf_tables_setelem_notify(&trans->ctx, te->set,
9275                                                  &te->elem,
9276                                                  NFT_MSG_NEWSETELEM);
9277                         nft_trans_destroy(trans);
9278                         break;
9279                 case NFT_MSG_DELSETELEM:
9280                 case NFT_MSG_DESTROYSETELEM:
9281                         te = (struct nft_trans_elem *)trans->data;
9282
9283                         nf_tables_setelem_notify(&trans->ctx, te->set,
9284                                                  &te->elem,
9285                                                  trans->msg_type);
9286                         nft_setelem_remove(net, te->set, &te->elem);
9287                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9288                                 atomic_dec(&te->set->nelems);
9289                                 te->set->ndeact--;
9290                         }
9291                         break;
9292                 case NFT_MSG_NEWOBJ:
9293                         if (nft_trans_obj_update(trans)) {
9294                                 nft_obj_commit_update(trans);
9295                                 nf_tables_obj_notify(&trans->ctx,
9296                                                      nft_trans_obj(trans),
9297                                                      NFT_MSG_NEWOBJ);
9298                         } else {
9299                                 nft_clear(net, nft_trans_obj(trans));
9300                                 nf_tables_obj_notify(&trans->ctx,
9301                                                      nft_trans_obj(trans),
9302                                                      NFT_MSG_NEWOBJ);
9303                                 nft_trans_destroy(trans);
9304                         }
9305                         break;
9306                 case NFT_MSG_DELOBJ:
9307                 case NFT_MSG_DESTROYOBJ:
9308                         nft_obj_del(nft_trans_obj(trans));
9309                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9310                                              trans->msg_type);
9311                         break;
9312                 case NFT_MSG_NEWFLOWTABLE:
9313                         if (nft_trans_flowtable_update(trans)) {
9314                                 nft_trans_flowtable(trans)->data.flags =
9315                                         nft_trans_flowtable_flags(trans);
9316                                 nf_tables_flowtable_notify(&trans->ctx,
9317                                                            nft_trans_flowtable(trans),
9318                                                            &nft_trans_flowtable_hooks(trans),
9319                                                            NFT_MSG_NEWFLOWTABLE);
9320                                 list_splice(&nft_trans_flowtable_hooks(trans),
9321                                             &nft_trans_flowtable(trans)->hook_list);
9322                         } else {
9323                                 nft_clear(net, nft_trans_flowtable(trans));
9324                                 nf_tables_flowtable_notify(&trans->ctx,
9325                                                            nft_trans_flowtable(trans),
9326                                                            &nft_trans_flowtable(trans)->hook_list,
9327                                                            NFT_MSG_NEWFLOWTABLE);
9328                         }
9329                         nft_trans_destroy(trans);
9330                         break;
9331                 case NFT_MSG_DELFLOWTABLE:
9332                 case NFT_MSG_DESTROYFLOWTABLE:
9333                         if (nft_trans_flowtable_update(trans)) {
9334                                 nf_tables_flowtable_notify(&trans->ctx,
9335                                                            nft_trans_flowtable(trans),
9336                                                            &nft_trans_flowtable_hooks(trans),
9337                                                            trans->msg_type);
9338                                 nft_unregister_flowtable_net_hooks(net,
9339                                                                    &nft_trans_flowtable_hooks(trans));
9340                         } else {
9341                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9342                                 nf_tables_flowtable_notify(&trans->ctx,
9343                                                            nft_trans_flowtable(trans),
9344                                                            &nft_trans_flowtable(trans)->hook_list,
9345                                                            trans->msg_type);
9346                                 nft_unregister_flowtable_net_hooks(net,
9347                                                 &nft_trans_flowtable(trans)->hook_list);
9348                         }
9349                         break;
9350                 }
9351         }
9352
9353         nft_commit_notify(net, NETLINK_CB(skb).portid);
9354         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9355         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9356         nf_tables_commit_release(net);
9357
9358         return 0;
9359 }
9360
9361 static void nf_tables_module_autoload(struct net *net)
9362 {
9363         struct nftables_pernet *nft_net = nft_pernet(net);
9364         struct nft_module_request *req, *next;
9365         LIST_HEAD(module_list);
9366
9367         list_splice_init(&nft_net->module_list, &module_list);
9368         mutex_unlock(&nft_net->commit_mutex);
9369         list_for_each_entry_safe(req, next, &module_list, list) {
9370                 request_module("%s", req->module);
9371                 req->done = true;
9372         }
9373         mutex_lock(&nft_net->commit_mutex);
9374         list_splice(&module_list, &nft_net->module_list);
9375 }
9376
9377 static void nf_tables_abort_release(struct nft_trans *trans)
9378 {
9379         switch (trans->msg_type) {
9380         case NFT_MSG_NEWTABLE:
9381                 nf_tables_table_destroy(&trans->ctx);
9382                 break;
9383         case NFT_MSG_NEWCHAIN:
9384                 nf_tables_chain_destroy(&trans->ctx);
9385                 break;
9386         case NFT_MSG_NEWRULE:
9387                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9388                 break;
9389         case NFT_MSG_NEWSET:
9390                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9391                 break;
9392         case NFT_MSG_NEWSETELEM:
9393                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9394                                      nft_trans_elem(trans).priv, true);
9395                 break;
9396         case NFT_MSG_NEWOBJ:
9397                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9398                 break;
9399         case NFT_MSG_NEWFLOWTABLE:
9400                 if (nft_trans_flowtable_update(trans))
9401                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9402                 else
9403                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9404                 break;
9405         }
9406         kfree(trans);
9407 }
9408
9409 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9410 {
9411         struct nftables_pernet *nft_net = nft_pernet(net);
9412         struct nft_trans *trans, *next;
9413         struct nft_trans_elem *te;
9414
9415         if (action == NFNL_ABORT_VALIDATE &&
9416             nf_tables_validate(net) < 0)
9417                 return -EAGAIN;
9418
9419         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9420                                          list) {
9421                 switch (trans->msg_type) {
9422                 case NFT_MSG_NEWTABLE:
9423                         if (nft_trans_table_update(trans)) {
9424                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9425                                         nft_trans_destroy(trans);
9426                                         break;
9427                                 }
9428                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9429                                         nf_tables_table_disable(net, trans->ctx.table);
9430                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9431                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9432                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9433                                 }
9434                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9435                                 nft_trans_destroy(trans);
9436                         } else {
9437                                 list_del_rcu(&trans->ctx.table->list);
9438                         }
9439                         break;
9440                 case NFT_MSG_DELTABLE:
9441                 case NFT_MSG_DESTROYTABLE:
9442                         nft_clear(trans->ctx.net, trans->ctx.table);
9443                         nft_trans_destroy(trans);
9444                         break;
9445                 case NFT_MSG_NEWCHAIN:
9446                         if (nft_trans_chain_update(trans)) {
9447                                 free_percpu(nft_trans_chain_stats(trans));
9448                                 kfree(nft_trans_chain_name(trans));
9449                                 nft_trans_destroy(trans);
9450                         } else {
9451                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9452                                         nft_trans_destroy(trans);
9453                                         break;
9454                                 }
9455                                 trans->ctx.table->use--;
9456                                 nft_chain_del(trans->ctx.chain);
9457                                 nf_tables_unregister_hook(trans->ctx.net,
9458                                                           trans->ctx.table,
9459                                                           trans->ctx.chain);
9460                         }
9461                         break;
9462                 case NFT_MSG_DELCHAIN:
9463                 case NFT_MSG_DESTROYCHAIN:
9464                         trans->ctx.table->use++;
9465                         nft_clear(trans->ctx.net, trans->ctx.chain);
9466                         nft_trans_destroy(trans);
9467                         break;
9468                 case NFT_MSG_NEWRULE:
9469                         trans->ctx.chain->use--;
9470                         list_del_rcu(&nft_trans_rule(trans)->list);
9471                         nft_rule_expr_deactivate(&trans->ctx,
9472                                                  nft_trans_rule(trans),
9473                                                  NFT_TRANS_ABORT);
9474                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9475                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9476                         break;
9477                 case NFT_MSG_DELRULE:
9478                 case NFT_MSG_DESTROYRULE:
9479                         trans->ctx.chain->use++;
9480                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9481                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9482                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9483                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9484
9485                         nft_trans_destroy(trans);
9486                         break;
9487                 case NFT_MSG_NEWSET:
9488                         if (nft_trans_set_update(trans)) {
9489                                 nft_trans_destroy(trans);
9490                                 break;
9491                         }
9492                         trans->ctx.table->use--;
9493                         if (nft_trans_set_bound(trans)) {
9494                                 nft_trans_destroy(trans);
9495                                 break;
9496                         }
9497                         list_del_rcu(&nft_trans_set(trans)->list);
9498                         break;
9499                 case NFT_MSG_DELSET:
9500                 case NFT_MSG_DESTROYSET:
9501                         trans->ctx.table->use++;
9502                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9503                         nft_trans_destroy(trans);
9504                         break;
9505                 case NFT_MSG_NEWSETELEM:
9506                         if (nft_trans_elem_set_bound(trans)) {
9507                                 nft_trans_destroy(trans);
9508                                 break;
9509                         }
9510                         te = (struct nft_trans_elem *)trans->data;
9511                         nft_setelem_remove(net, te->set, &te->elem);
9512                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9513                                 atomic_dec(&te->set->nelems);
9514                         break;
9515                 case NFT_MSG_DELSETELEM:
9516                 case NFT_MSG_DESTROYSETELEM:
9517                         te = (struct nft_trans_elem *)trans->data;
9518
9519                         nft_setelem_data_activate(net, te->set, &te->elem);
9520                         nft_setelem_activate(net, te->set, &te->elem);
9521                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9522                                 te->set->ndeact--;
9523
9524                         nft_trans_destroy(trans);
9525                         break;
9526                 case NFT_MSG_NEWOBJ:
9527                         if (nft_trans_obj_update(trans)) {
9528                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9529                                 nft_trans_destroy(trans);
9530                         } else {
9531                                 trans->ctx.table->use--;
9532                                 nft_obj_del(nft_trans_obj(trans));
9533                         }
9534                         break;
9535                 case NFT_MSG_DELOBJ:
9536                 case NFT_MSG_DESTROYOBJ:
9537                         trans->ctx.table->use++;
9538                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9539                         nft_trans_destroy(trans);
9540                         break;
9541                 case NFT_MSG_NEWFLOWTABLE:
9542                         if (nft_trans_flowtable_update(trans)) {
9543                                 nft_unregister_flowtable_net_hooks(net,
9544                                                 &nft_trans_flowtable_hooks(trans));
9545                         } else {
9546                                 trans->ctx.table->use--;
9547                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9548                                 nft_unregister_flowtable_net_hooks(net,
9549                                                 &nft_trans_flowtable(trans)->hook_list);
9550                         }
9551                         break;
9552                 case NFT_MSG_DELFLOWTABLE:
9553                 case NFT_MSG_DESTROYFLOWTABLE:
9554                         if (nft_trans_flowtable_update(trans)) {
9555                                 list_splice(&nft_trans_flowtable_hooks(trans),
9556                                             &nft_trans_flowtable(trans)->hook_list);
9557                         } else {
9558                                 trans->ctx.table->use++;
9559                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9560                         }
9561                         nft_trans_destroy(trans);
9562                         break;
9563                 }
9564         }
9565
9566         synchronize_rcu();
9567
9568         list_for_each_entry_safe_reverse(trans, next,
9569                                          &nft_net->commit_list, list) {
9570                 list_del(&trans->list);
9571                 nf_tables_abort_release(trans);
9572         }
9573
9574         if (action == NFNL_ABORT_AUTOLOAD)
9575                 nf_tables_module_autoload(net);
9576         else
9577                 nf_tables_module_autoload_cleanup(net);
9578
9579         return 0;
9580 }
9581
9582 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9583                            enum nfnl_abort_action action)
9584 {
9585         struct nftables_pernet *nft_net = nft_pernet(net);
9586         int ret = __nf_tables_abort(net, action);
9587
9588         mutex_unlock(&nft_net->commit_mutex);
9589
9590         return ret;
9591 }
9592
9593 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9594 {
9595         struct nftables_pernet *nft_net = nft_pernet(net);
9596         bool genid_ok;
9597
9598         mutex_lock(&nft_net->commit_mutex);
9599
9600         genid_ok = genid == 0 || nft_net->base_seq == genid;
9601         if (!genid_ok)
9602                 mutex_unlock(&nft_net->commit_mutex);
9603
9604         /* else, commit mutex has to be released by commit or abort function */
9605         return genid_ok;
9606 }
9607
9608 static const struct nfnetlink_subsystem nf_tables_subsys = {
9609         .name           = "nf_tables",
9610         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9611         .cb_count       = NFT_MSG_MAX,
9612         .cb             = nf_tables_cb,
9613         .commit         = nf_tables_commit,
9614         .abort          = nf_tables_abort,
9615         .valid_genid    = nf_tables_valid_genid,
9616         .owner          = THIS_MODULE,
9617 };
9618
9619 int nft_chain_validate_dependency(const struct nft_chain *chain,
9620                                   enum nft_chain_types type)
9621 {
9622         const struct nft_base_chain *basechain;
9623
9624         if (nft_is_base_chain(chain)) {
9625                 basechain = nft_base_chain(chain);
9626                 if (basechain->type->type != type)
9627                         return -EOPNOTSUPP;
9628         }
9629         return 0;
9630 }
9631 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9632
9633 int nft_chain_validate_hooks(const struct nft_chain *chain,
9634                              unsigned int hook_flags)
9635 {
9636         struct nft_base_chain *basechain;
9637
9638         if (nft_is_base_chain(chain)) {
9639                 basechain = nft_base_chain(chain);
9640
9641                 if ((1 << basechain->ops.hooknum) & hook_flags)
9642                         return 0;
9643
9644                 return -EOPNOTSUPP;
9645         }
9646
9647         return 0;
9648 }
9649 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9650
9651 /*
9652  * Loop detection - walk through the ruleset beginning at the destination chain
9653  * of a new jump until either the source chain is reached (loop) or all
9654  * reachable chains have been traversed.
9655  *
9656  * The loop check is performed whenever a new jump verdict is added to an
9657  * expression or verdict map or a verdict map is bound to a new chain.
9658  */
9659
9660 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9661                                  const struct nft_chain *chain);
9662
9663 static int nft_check_loops(const struct nft_ctx *ctx,
9664                            const struct nft_set_ext *ext)
9665 {
9666         const struct nft_data *data;
9667         int ret;
9668
9669         data = nft_set_ext_data(ext);
9670         switch (data->verdict.code) {
9671         case NFT_JUMP:
9672         case NFT_GOTO:
9673                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9674                 break;
9675         default:
9676                 ret = 0;
9677                 break;
9678         }
9679
9680         return ret;
9681 }
9682
9683 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9684                                         struct nft_set *set,
9685                                         const struct nft_set_iter *iter,
9686                                         struct nft_set_elem *elem)
9687 {
9688         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9689
9690         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9691             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9692                 return 0;
9693
9694         return nft_check_loops(ctx, ext);
9695 }
9696
9697 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9698                                   struct nft_set *set)
9699 {
9700         u8 genmask = nft_genmask_next(ctx->net);
9701         struct nft_set_elem_catchall *catchall;
9702         struct nft_set_ext *ext;
9703         int ret = 0;
9704
9705         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9706                 ext = nft_set_elem_ext(set, catchall->elem);
9707                 if (!nft_set_elem_active(ext, genmask))
9708                         continue;
9709
9710                 ret = nft_check_loops(ctx, ext);
9711                 if (ret < 0)
9712                         return ret;
9713         }
9714
9715         return ret;
9716 }
9717
9718 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9719                                  const struct nft_chain *chain)
9720 {
9721         const struct nft_rule *rule;
9722         const struct nft_expr *expr, *last;
9723         struct nft_set *set;
9724         struct nft_set_binding *binding;
9725         struct nft_set_iter iter;
9726
9727         if (ctx->chain == chain)
9728                 return -ELOOP;
9729
9730         list_for_each_entry(rule, &chain->rules, list) {
9731                 nft_rule_for_each_expr(expr, last, rule) {
9732                         struct nft_immediate_expr *priv;
9733                         const struct nft_data *data;
9734                         int err;
9735
9736                         if (strcmp(expr->ops->type->name, "immediate"))
9737                                 continue;
9738
9739                         priv = nft_expr_priv(expr);
9740                         if (priv->dreg != NFT_REG_VERDICT)
9741                                 continue;
9742
9743                         data = &priv->data;
9744                         switch (data->verdict.code) {
9745                         case NFT_JUMP:
9746                         case NFT_GOTO:
9747                                 err = nf_tables_check_loops(ctx,
9748                                                         data->verdict.chain);
9749                                 if (err < 0)
9750                                         return err;
9751                                 break;
9752                         default:
9753                                 break;
9754                         }
9755                 }
9756         }
9757
9758         list_for_each_entry(set, &ctx->table->sets, list) {
9759                 if (!nft_is_active_next(ctx->net, set))
9760                         continue;
9761                 if (!(set->flags & NFT_SET_MAP) ||
9762                     set->dtype != NFT_DATA_VERDICT)
9763                         continue;
9764
9765                 list_for_each_entry(binding, &set->bindings, list) {
9766                         if (!(binding->flags & NFT_SET_MAP) ||
9767                             binding->chain != chain)
9768                                 continue;
9769
9770                         iter.genmask    = nft_genmask_next(ctx->net);
9771                         iter.skip       = 0;
9772                         iter.count      = 0;
9773                         iter.err        = 0;
9774                         iter.fn         = nf_tables_loop_check_setelem;
9775
9776                         set->ops->walk(ctx, set, &iter);
9777                         if (!iter.err)
9778                                 iter.err = nft_set_catchall_loops(ctx, set);
9779
9780                         if (iter.err < 0)
9781                                 return iter.err;
9782                 }
9783         }
9784
9785         return 0;
9786 }
9787
9788 /**
9789  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9790  *
9791  *      @attr: netlink attribute to fetch value from
9792  *      @max: maximum value to be stored in dest
9793  *      @dest: pointer to the variable
9794  *
9795  *      Parse, check and store a given u32 netlink attribute into variable.
9796  *      This function returns -ERANGE if the value goes over maximum value.
9797  *      Otherwise a 0 is returned and the attribute value is stored in the
9798  *      destination variable.
9799  */
9800 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9801 {
9802         u32 val;
9803
9804         val = ntohl(nla_get_be32(attr));
9805         if (val > max)
9806                 return -ERANGE;
9807
9808         *dest = val;
9809         return 0;
9810 }
9811 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9812
9813 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9814 {
9815         unsigned int reg;
9816
9817         reg = ntohl(nla_get_be32(attr));
9818         switch (reg) {
9819         case NFT_REG_VERDICT...NFT_REG_4:
9820                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9821                 break;
9822         case NFT_REG32_00...NFT_REG32_15:
9823                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9824                 break;
9825         default:
9826                 return -ERANGE;
9827         }
9828
9829         return 0;
9830 }
9831
9832 /**
9833  *      nft_dump_register - dump a register value to a netlink attribute
9834  *
9835  *      @skb: socket buffer
9836  *      @attr: attribute number
9837  *      @reg: register number
9838  *
9839  *      Construct a netlink attribute containing the register number. For
9840  *      compatibility reasons, register numbers being a multiple of 4 are
9841  *      translated to the corresponding 128 bit register numbers.
9842  */
9843 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9844 {
9845         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9846                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9847         else
9848                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9849
9850         return nla_put_be32(skb, attr, htonl(reg));
9851 }
9852 EXPORT_SYMBOL_GPL(nft_dump_register);
9853
9854 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9855 {
9856         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9857                 return -EINVAL;
9858         if (len == 0)
9859                 return -EINVAL;
9860         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9861                 return -ERANGE;
9862
9863         return 0;
9864 }
9865
9866 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9867 {
9868         u32 reg;
9869         int err;
9870
9871         err = nft_parse_register(attr, &reg);
9872         if (err < 0)
9873                 return err;
9874
9875         err = nft_validate_register_load(reg, len);
9876         if (err < 0)
9877                 return err;
9878
9879         *sreg = reg;
9880         return 0;
9881 }
9882 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9883
9884 static int nft_validate_register_store(const struct nft_ctx *ctx,
9885                                        enum nft_registers reg,
9886                                        const struct nft_data *data,
9887                                        enum nft_data_types type,
9888                                        unsigned int len)
9889 {
9890         int err;
9891
9892         switch (reg) {
9893         case NFT_REG_VERDICT:
9894                 if (type != NFT_DATA_VERDICT)
9895                         return -EINVAL;
9896
9897                 if (data != NULL &&
9898                     (data->verdict.code == NFT_GOTO ||
9899                      data->verdict.code == NFT_JUMP)) {
9900                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9901                         if (err < 0)
9902                                 return err;
9903                 }
9904
9905                 return 0;
9906         default:
9907                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9908                         return -EINVAL;
9909                 if (len == 0)
9910                         return -EINVAL;
9911                 if (reg * NFT_REG32_SIZE + len >
9912                     sizeof_field(struct nft_regs, data))
9913                         return -ERANGE;
9914
9915                 if (data != NULL && type != NFT_DATA_VALUE)
9916                         return -EINVAL;
9917                 return 0;
9918         }
9919 }
9920
9921 int nft_parse_register_store(const struct nft_ctx *ctx,
9922                              const struct nlattr *attr, u8 *dreg,
9923                              const struct nft_data *data,
9924                              enum nft_data_types type, unsigned int len)
9925 {
9926         int err;
9927         u32 reg;
9928
9929         err = nft_parse_register(attr, &reg);
9930         if (err < 0)
9931                 return err;
9932
9933         err = nft_validate_register_store(ctx, reg, data, type, len);
9934         if (err < 0)
9935                 return err;
9936
9937         *dreg = reg;
9938         return 0;
9939 }
9940 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9941
9942 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9943         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9944         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9945                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9946         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9947 };
9948
9949 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9950                             struct nft_data_desc *desc, const struct nlattr *nla)
9951 {
9952         u8 genmask = nft_genmask_next(ctx->net);
9953         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9954         struct nft_chain *chain;
9955         int err;
9956
9957         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9958                                           nft_verdict_policy, NULL);
9959         if (err < 0)
9960                 return err;
9961
9962         if (!tb[NFTA_VERDICT_CODE])
9963                 return -EINVAL;
9964         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9965
9966         switch (data->verdict.code) {
9967         default:
9968                 switch (data->verdict.code & NF_VERDICT_MASK) {
9969                 case NF_ACCEPT:
9970                 case NF_DROP:
9971                 case NF_QUEUE:
9972                         break;
9973                 default:
9974                         return -EINVAL;
9975                 }
9976                 fallthrough;
9977         case NFT_CONTINUE:
9978         case NFT_BREAK:
9979         case NFT_RETURN:
9980                 break;
9981         case NFT_JUMP:
9982         case NFT_GOTO:
9983                 if (tb[NFTA_VERDICT_CHAIN]) {
9984                         chain = nft_chain_lookup(ctx->net, ctx->table,
9985                                                  tb[NFTA_VERDICT_CHAIN],
9986                                                  genmask);
9987                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9988                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
9989                                                       tb[NFTA_VERDICT_CHAIN_ID]);
9990                         if (IS_ERR(chain))
9991                                 return PTR_ERR(chain);
9992                 } else {
9993                         return -EINVAL;
9994                 }
9995
9996                 if (IS_ERR(chain))
9997                         return PTR_ERR(chain);
9998                 if (nft_is_base_chain(chain))
9999                         return -EOPNOTSUPP;
10000                 if (nft_chain_is_bound(chain))
10001                         return -EINVAL;
10002                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10003                     chain->flags & NFT_CHAIN_BINDING)
10004                         return -EINVAL;
10005
10006                 chain->use++;
10007                 data->verdict.chain = chain;
10008                 break;
10009         }
10010
10011         desc->len = sizeof(data->verdict);
10012
10013         return 0;
10014 }
10015
10016 static void nft_verdict_uninit(const struct nft_data *data)
10017 {
10018         struct nft_chain *chain;
10019         struct nft_rule *rule;
10020
10021         switch (data->verdict.code) {
10022         case NFT_JUMP:
10023         case NFT_GOTO:
10024                 chain = data->verdict.chain;
10025                 chain->use--;
10026
10027                 if (!nft_chain_is_bound(chain))
10028                         break;
10029
10030                 chain->table->use--;
10031                 list_for_each_entry(rule, &chain->rules, list)
10032                         chain->use--;
10033
10034                 nft_chain_del(chain);
10035                 break;
10036         }
10037 }
10038
10039 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10040 {
10041         struct nlattr *nest;
10042
10043         nest = nla_nest_start_noflag(skb, type);
10044         if (!nest)
10045                 goto nla_put_failure;
10046
10047         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10048                 goto nla_put_failure;
10049
10050         switch (v->code) {
10051         case NFT_JUMP:
10052         case NFT_GOTO:
10053                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10054                                    v->chain->name))
10055                         goto nla_put_failure;
10056         }
10057         nla_nest_end(skb, nest);
10058         return 0;
10059
10060 nla_put_failure:
10061         return -1;
10062 }
10063
10064 static int nft_value_init(const struct nft_ctx *ctx,
10065                           struct nft_data *data, struct nft_data_desc *desc,
10066                           const struct nlattr *nla)
10067 {
10068         unsigned int len;
10069
10070         len = nla_len(nla);
10071         if (len == 0)
10072                 return -EINVAL;
10073         if (len > desc->size)
10074                 return -EOVERFLOW;
10075         if (desc->len) {
10076                 if (len != desc->len)
10077                         return -EINVAL;
10078         } else {
10079                 desc->len = len;
10080         }
10081
10082         nla_memcpy(data->data, nla, len);
10083
10084         return 0;
10085 }
10086
10087 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10088                           unsigned int len)
10089 {
10090         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10091 }
10092
10093 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10094         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10095         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10096 };
10097
10098 /**
10099  *      nft_data_init - parse nf_tables data netlink attributes
10100  *
10101  *      @ctx: context of the expression using the data
10102  *      @data: destination struct nft_data
10103  *      @desc: data description
10104  *      @nla: netlink attribute containing data
10105  *
10106  *      Parse the netlink data attributes and initialize a struct nft_data.
10107  *      The type and length of data are returned in the data description.
10108  *
10109  *      The caller can indicate that it only wants to accept data of type
10110  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10111  */
10112 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10113                   struct nft_data_desc *desc, const struct nlattr *nla)
10114 {
10115         struct nlattr *tb[NFTA_DATA_MAX + 1];
10116         int err;
10117
10118         if (WARN_ON_ONCE(!desc->size))
10119                 return -EINVAL;
10120
10121         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10122                                           nft_data_policy, NULL);
10123         if (err < 0)
10124                 return err;
10125
10126         if (tb[NFTA_DATA_VALUE]) {
10127                 if (desc->type != NFT_DATA_VALUE)
10128                         return -EINVAL;
10129
10130                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10131         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10132                 if (desc->type != NFT_DATA_VERDICT)
10133                         return -EINVAL;
10134
10135                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10136         } else {
10137                 err = -EINVAL;
10138         }
10139
10140         return err;
10141 }
10142 EXPORT_SYMBOL_GPL(nft_data_init);
10143
10144 /**
10145  *      nft_data_release - release a nft_data item
10146  *
10147  *      @data: struct nft_data to release
10148  *      @type: type of data
10149  *
10150  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10151  *      all others need to be released by calling this function.
10152  */
10153 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10154 {
10155         if (type < NFT_DATA_VERDICT)
10156                 return;
10157         switch (type) {
10158         case NFT_DATA_VERDICT:
10159                 return nft_verdict_uninit(data);
10160         default:
10161                 WARN_ON(1);
10162         }
10163 }
10164 EXPORT_SYMBOL_GPL(nft_data_release);
10165
10166 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10167                   enum nft_data_types type, unsigned int len)
10168 {
10169         struct nlattr *nest;
10170         int err;
10171
10172         nest = nla_nest_start_noflag(skb, attr);
10173         if (nest == NULL)
10174                 return -1;
10175
10176         switch (type) {
10177         case NFT_DATA_VALUE:
10178                 err = nft_value_dump(skb, data, len);
10179                 break;
10180         case NFT_DATA_VERDICT:
10181                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10182                 break;
10183         default:
10184                 err = -EINVAL;
10185                 WARN_ON(1);
10186         }
10187
10188         nla_nest_end(skb, nest);
10189         return err;
10190 }
10191 EXPORT_SYMBOL_GPL(nft_data_dump);
10192
10193 int __nft_release_basechain(struct nft_ctx *ctx)
10194 {
10195         struct nft_rule *rule, *nr;
10196
10197         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10198                 return 0;
10199
10200         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10201         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10202                 list_del(&rule->list);
10203                 ctx->chain->use--;
10204                 nf_tables_rule_release(ctx, rule);
10205         }
10206         nft_chain_del(ctx->chain);
10207         ctx->table->use--;
10208         nf_tables_chain_destroy(ctx);
10209
10210         return 0;
10211 }
10212 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10213
10214 static void __nft_release_hook(struct net *net, struct nft_table *table)
10215 {
10216         struct nft_flowtable *flowtable;
10217         struct nft_chain *chain;
10218
10219         list_for_each_entry(chain, &table->chains, list)
10220                 __nf_tables_unregister_hook(net, table, chain, true);
10221         list_for_each_entry(flowtable, &table->flowtables, list)
10222                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10223                                                      true);
10224 }
10225
10226 static void __nft_release_hooks(struct net *net)
10227 {
10228         struct nftables_pernet *nft_net = nft_pernet(net);
10229         struct nft_table *table;
10230
10231         list_for_each_entry(table, &nft_net->tables, list) {
10232                 if (nft_table_has_owner(table))
10233                         continue;
10234
10235                 __nft_release_hook(net, table);
10236         }
10237 }
10238
10239 static void __nft_release_table(struct net *net, struct nft_table *table)
10240 {
10241         struct nft_flowtable *flowtable, *nf;
10242         struct nft_chain *chain, *nc;
10243         struct nft_object *obj, *ne;
10244         struct nft_rule *rule, *nr;
10245         struct nft_set *set, *ns;
10246         struct nft_ctx ctx = {
10247                 .net    = net,
10248                 .family = NFPROTO_NETDEV,
10249         };
10250
10251         ctx.family = table->family;
10252         ctx.table = table;
10253         list_for_each_entry(chain, &table->chains, list) {
10254                 ctx.chain = chain;
10255                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10256                         list_del(&rule->list);
10257                         chain->use--;
10258                         nf_tables_rule_release(&ctx, rule);
10259                 }
10260         }
10261         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10262                 list_del(&flowtable->list);
10263                 table->use--;
10264                 nf_tables_flowtable_destroy(flowtable);
10265         }
10266         list_for_each_entry_safe(set, ns, &table->sets, list) {
10267                 list_del(&set->list);
10268                 table->use--;
10269                 nft_set_destroy(&ctx, set);
10270         }
10271         list_for_each_entry_safe(obj, ne, &table->objects, list) {
10272                 nft_obj_del(obj);
10273                 table->use--;
10274                 nft_obj_destroy(&ctx, obj);
10275         }
10276         list_for_each_entry_safe(chain, nc, &table->chains, list) {
10277                 ctx.chain = chain;
10278                 nft_chain_del(chain);
10279                 table->use--;
10280                 nf_tables_chain_destroy(&ctx);
10281         }
10282         nf_tables_table_destroy(&ctx);
10283 }
10284
10285 static void __nft_release_tables(struct net *net)
10286 {
10287         struct nftables_pernet *nft_net = nft_pernet(net);
10288         struct nft_table *table, *nt;
10289
10290         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10291                 if (nft_table_has_owner(table))
10292                         continue;
10293
10294                 list_del(&table->list);
10295
10296                 __nft_release_table(net, table);
10297         }
10298 }
10299
10300 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10301                             void *ptr)
10302 {
10303         struct nft_table *table, *to_delete[8];
10304         struct nftables_pernet *nft_net;
10305         struct netlink_notify *n = ptr;
10306         struct net *net = n->net;
10307         unsigned int deleted;
10308         bool restart = false;
10309
10310         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10311                 return NOTIFY_DONE;
10312
10313         nft_net = nft_pernet(net);
10314         deleted = 0;
10315         mutex_lock(&nft_net->commit_mutex);
10316         if (!list_empty(&nf_tables_destroy_list))
10317                 rcu_barrier();
10318 again:
10319         list_for_each_entry(table, &nft_net->tables, list) {
10320                 if (nft_table_has_owner(table) &&
10321                     n->portid == table->nlpid) {
10322                         __nft_release_hook(net, table);
10323                         list_del_rcu(&table->list);
10324                         to_delete[deleted++] = table;
10325                         if (deleted >= ARRAY_SIZE(to_delete))
10326                                 break;
10327                 }
10328         }
10329         if (deleted) {
10330                 restart = deleted >= ARRAY_SIZE(to_delete);
10331                 synchronize_rcu();
10332                 while (deleted)
10333                         __nft_release_table(net, to_delete[--deleted]);
10334
10335                 if (restart)
10336                         goto again;
10337         }
10338         mutex_unlock(&nft_net->commit_mutex);
10339
10340         return NOTIFY_DONE;
10341 }
10342
10343 static struct notifier_block nft_nl_notifier = {
10344         .notifier_call  = nft_rcv_nl_event,
10345 };
10346
10347 static int __net_init nf_tables_init_net(struct net *net)
10348 {
10349         struct nftables_pernet *nft_net = nft_pernet(net);
10350
10351         INIT_LIST_HEAD(&nft_net->tables);
10352         INIT_LIST_HEAD(&nft_net->commit_list);
10353         INIT_LIST_HEAD(&nft_net->module_list);
10354         INIT_LIST_HEAD(&nft_net->notify_list);
10355         mutex_init(&nft_net->commit_mutex);
10356         nft_net->base_seq = 1;
10357
10358         return 0;
10359 }
10360
10361 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10362 {
10363         struct nftables_pernet *nft_net = nft_pernet(net);
10364
10365         mutex_lock(&nft_net->commit_mutex);
10366         __nft_release_hooks(net);
10367         mutex_unlock(&nft_net->commit_mutex);
10368 }
10369
10370 static void __net_exit nf_tables_exit_net(struct net *net)
10371 {
10372         struct nftables_pernet *nft_net = nft_pernet(net);
10373
10374         mutex_lock(&nft_net->commit_mutex);
10375         if (!list_empty(&nft_net->commit_list) ||
10376             !list_empty(&nft_net->module_list))
10377                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10378         __nft_release_tables(net);
10379         mutex_unlock(&nft_net->commit_mutex);
10380         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10381         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10382         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10383 }
10384
10385 static struct pernet_operations nf_tables_net_ops = {
10386         .init           = nf_tables_init_net,
10387         .pre_exit       = nf_tables_pre_exit_net,
10388         .exit           = nf_tables_exit_net,
10389         .id             = &nf_tables_net_id,
10390         .size           = sizeof(struct nftables_pernet),
10391 };
10392
10393 static int __init nf_tables_module_init(void)
10394 {
10395         int err;
10396
10397         err = register_pernet_subsys(&nf_tables_net_ops);
10398         if (err < 0)
10399                 return err;
10400
10401         err = nft_chain_filter_init();
10402         if (err < 0)
10403                 goto err_chain_filter;
10404
10405         err = nf_tables_core_module_init();
10406         if (err < 0)
10407                 goto err_core_module;
10408
10409         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10410         if (err < 0)
10411                 goto err_netdev_notifier;
10412
10413         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10414         if (err < 0)
10415                 goto err_rht_objname;
10416
10417         err = nft_offload_init();
10418         if (err < 0)
10419                 goto err_offload;
10420
10421         err = netlink_register_notifier(&nft_nl_notifier);
10422         if (err < 0)
10423                 goto err_netlink_notifier;
10424
10425         /* must be last */
10426         err = nfnetlink_subsys_register(&nf_tables_subsys);
10427         if (err < 0)
10428                 goto err_nfnl_subsys;
10429
10430         nft_chain_route_init();
10431
10432         return err;
10433
10434 err_nfnl_subsys:
10435         netlink_unregister_notifier(&nft_nl_notifier);
10436 err_netlink_notifier:
10437         nft_offload_exit();
10438 err_offload:
10439         rhltable_destroy(&nft_objname_ht);
10440 err_rht_objname:
10441         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10442 err_netdev_notifier:
10443         nf_tables_core_module_exit();
10444 err_core_module:
10445         nft_chain_filter_fini();
10446 err_chain_filter:
10447         unregister_pernet_subsys(&nf_tables_net_ops);
10448         return err;
10449 }
10450
10451 static void __exit nf_tables_module_exit(void)
10452 {
10453         nfnetlink_subsys_unregister(&nf_tables_subsys);
10454         netlink_unregister_notifier(&nft_nl_notifier);
10455         nft_offload_exit();
10456         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10457         nft_chain_filter_fini();
10458         nft_chain_route_fini();
10459         unregister_pernet_subsys(&nf_tables_net_ops);
10460         cancel_work_sync(&trans_destroy_work);
10461         rcu_barrier();
10462         rhltable_destroy(&nft_objname_ht);
10463         nf_tables_core_module_exit();
10464 }
10465
10466 module_init(nf_tables_module_init);
10467 module_exit(nf_tables_module_exit);
10468
10469 MODULE_LICENSE("GPL");
10470 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10471 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);