2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/vmalloc.h>
17 #include <linux/rhashtable.h>
18 #include <linux/netfilter.h>
19 #include <linux/netfilter/nfnetlink.h>
20 #include <linux/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_flow_table.h>
22 #include <net/netfilter/nf_tables_core.h>
23 #include <net/netfilter/nf_tables.h>
24 #include <net/net_namespace.h>
27 static LIST_HEAD(nf_tables_expressions);
28 static LIST_HEAD(nf_tables_objects);
29 static LIST_HEAD(nf_tables_flowtables);
30 static LIST_HEAD(nf_tables_destroy_list);
31 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
32 static u64 table_handle;
35 NFT_VALIDATE_SKIP = 0,
40 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
41 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
42 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
44 static const struct rhashtable_params nft_chain_ht_params = {
45 .head_offset = offsetof(struct nft_chain, rhlhead),
46 .key_offset = offsetof(struct nft_chain, name),
47 .hashfn = nft_chain_hash,
48 .obj_hashfn = nft_chain_hash_obj,
49 .obj_cmpfn = nft_chain_hash_cmp,
51 .automatic_shrinking = true,
54 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
56 switch (net->nft.validate_state) {
57 case NFT_VALIDATE_SKIP:
58 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
60 case NFT_VALIDATE_NEED:
63 if (new_validate_state == NFT_VALIDATE_NEED)
67 net->nft.validate_state = new_validate_state;
69 static void nf_tables_trans_destroy_work(struct work_struct *w);
70 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
72 static void nft_ctx_init(struct nft_ctx *ctx,
74 const struct sk_buff *skb,
75 const struct nlmsghdr *nlh,
77 struct nft_table *table,
78 struct nft_chain *chain,
79 const struct nlattr * const *nla)
87 ctx->portid = NETLINK_CB(skb).portid;
88 ctx->report = nlmsg_report(nlh);
89 ctx->seq = nlh->nlmsg_seq;
92 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
93 int msg_type, u32 size, gfp_t gfp)
95 struct nft_trans *trans;
97 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
101 trans->msg_type = msg_type;
107 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
108 int msg_type, u32 size)
110 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
113 static void nft_trans_destroy(struct nft_trans *trans)
115 list_del(&trans->list);
119 static int nf_tables_register_hook(struct net *net,
120 const struct nft_table *table,
121 struct nft_chain *chain)
123 const struct nft_base_chain *basechain;
124 const struct nf_hook_ops *ops;
126 if (table->flags & NFT_TABLE_F_DORMANT ||
127 !nft_is_base_chain(chain))
130 basechain = nft_base_chain(chain);
131 ops = &basechain->ops;
133 if (basechain->type->ops_register)
134 return basechain->type->ops_register(net, ops);
136 return nf_register_net_hook(net, ops);
139 static void nf_tables_unregister_hook(struct net *net,
140 const struct nft_table *table,
141 struct nft_chain *chain)
143 const struct nft_base_chain *basechain;
144 const struct nf_hook_ops *ops;
146 if (table->flags & NFT_TABLE_F_DORMANT ||
147 !nft_is_base_chain(chain))
149 basechain = nft_base_chain(chain);
150 ops = &basechain->ops;
152 if (basechain->type->ops_unregister)
153 return basechain->type->ops_unregister(net, ops);
155 nf_unregister_net_hook(net, ops);
158 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
160 struct nft_trans *trans;
162 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
166 if (msg_type == NFT_MSG_NEWTABLE)
167 nft_activate_next(ctx->net, ctx->table);
169 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
173 static int nft_deltable(struct nft_ctx *ctx)
177 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
181 nft_deactivate_next(ctx->net, ctx->table);
185 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
187 struct nft_trans *trans;
189 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
193 if (msg_type == NFT_MSG_NEWCHAIN)
194 nft_activate_next(ctx->net, ctx->chain);
196 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
200 static int nft_delchain(struct nft_ctx *ctx)
204 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
209 nft_deactivate_next(ctx->net, ctx->chain);
214 /* either expr ops provide both activate/deactivate, or neither */
215 static bool nft_expr_check_ops(const struct nft_expr_ops *ops)
220 if (WARN_ON_ONCE((!ops->activate ^ !ops->deactivate)))
226 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
227 struct nft_rule *rule)
229 struct nft_expr *expr;
231 expr = nft_expr_first(rule);
232 while (expr != nft_expr_last(rule) && expr->ops) {
233 if (expr->ops->activate)
234 expr->ops->activate(ctx, expr);
236 expr = nft_expr_next(expr);
240 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
241 struct nft_rule *rule)
243 struct nft_expr *expr;
245 expr = nft_expr_first(rule);
246 while (expr != nft_expr_last(rule) && expr->ops) {
247 if (expr->ops->deactivate)
248 expr->ops->deactivate(ctx, expr);
250 expr = nft_expr_next(expr);
255 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
257 /* You cannot delete the same rule twice */
258 if (nft_is_active_next(ctx->net, rule)) {
259 nft_deactivate_next(ctx->net, rule);
266 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
267 struct nft_rule *rule)
269 struct nft_trans *trans;
271 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
275 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
276 nft_trans_rule_id(trans) =
277 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
279 nft_trans_rule(trans) = rule;
280 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
285 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
287 struct nft_trans *trans;
290 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
294 err = nf_tables_delrule_deactivate(ctx, rule);
296 nft_trans_destroy(trans);
299 nft_rule_expr_deactivate(ctx, rule);
304 static int nft_delrule_by_chain(struct nft_ctx *ctx)
306 struct nft_rule *rule;
309 list_for_each_entry(rule, &ctx->chain->rules, list) {
310 err = nft_delrule(ctx, rule);
317 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
320 struct nft_trans *trans;
322 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
326 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
327 nft_trans_set_id(trans) =
328 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
329 nft_activate_next(ctx->net, set);
331 nft_trans_set(trans) = set;
332 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
337 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
341 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
345 nft_deactivate_next(ctx->net, set);
351 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
352 struct nft_object *obj)
354 struct nft_trans *trans;
356 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
360 if (msg_type == NFT_MSG_NEWOBJ)
361 nft_activate_next(ctx->net, obj);
363 nft_trans_obj(trans) = obj;
364 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
369 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
373 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
377 nft_deactivate_next(ctx->net, obj);
383 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
384 struct nft_flowtable *flowtable)
386 struct nft_trans *trans;
388 trans = nft_trans_alloc(ctx, msg_type,
389 sizeof(struct nft_trans_flowtable));
393 if (msg_type == NFT_MSG_NEWFLOWTABLE)
394 nft_activate_next(ctx->net, flowtable);
396 nft_trans_flowtable(trans) = flowtable;
397 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
402 static int nft_delflowtable(struct nft_ctx *ctx,
403 struct nft_flowtable *flowtable)
407 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
411 nft_deactivate_next(ctx->net, flowtable);
421 static struct nft_table *nft_table_lookup(const struct net *net,
422 const struct nlattr *nla,
423 u8 family, u8 genmask)
425 struct nft_table *table;
428 return ERR_PTR(-EINVAL);
430 list_for_each_entry_rcu(table, &net->nft.tables, list) {
431 if (!nla_strcmp(nla, table->name) &&
432 table->family == family &&
433 nft_active_genmask(table, genmask))
437 return ERR_PTR(-ENOENT);
440 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
441 const struct nlattr *nla,
444 struct nft_table *table;
446 list_for_each_entry(table, &net->nft.tables, list) {
447 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
448 nft_active_genmask(table, genmask))
452 return ERR_PTR(-ENOENT);
455 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
457 return ++table->hgenerator;
460 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
462 static const struct nft_chain_type *
463 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
467 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
468 if (chain_type[family][i] != NULL &&
469 !nla_strcmp(nla, chain_type[family][i]->name))
470 return chain_type[family][i];
476 * Loading a module requires dropping mutex that guards the
478 * We first need to abort any pending transactions as once
479 * mutex is unlocked a different client could start a new
480 * transaction. It must not see any 'future generation'
481 * changes * as these changes will never happen.
483 #ifdef CONFIG_MODULES
484 static int __nf_tables_abort(struct net *net);
486 static void nft_request_module(struct net *net, const char *fmt, ...)
488 char module_name[MODULE_NAME_LEN];
492 __nf_tables_abort(net);
495 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
497 if (WARN(ret >= MODULE_NAME_LEN, "truncated: '%s' (len %d)", module_name, ret))
500 mutex_unlock(&net->nft.commit_mutex);
501 request_module("%s", module_name);
502 mutex_lock(&net->nft.commit_mutex);
506 static void lockdep_nfnl_nft_mutex_not_held(void)
508 #ifdef CONFIG_PROVE_LOCKING
509 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
513 static const struct nft_chain_type *
514 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
515 u8 family, bool autoload)
517 const struct nft_chain_type *type;
519 type = __nf_tables_chain_type_lookup(nla, family);
523 lockdep_nfnl_nft_mutex_not_held();
524 #ifdef CONFIG_MODULES
526 nft_request_module(net, "nft-chain-%u-%.*s", family,
527 nla_len(nla), (const char *)nla_data(nla));
528 type = __nf_tables_chain_type_lookup(nla, family);
530 return ERR_PTR(-EAGAIN);
533 return ERR_PTR(-ENOENT);
536 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
537 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
538 .len = NFT_TABLE_MAXNAMELEN - 1 },
539 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
540 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
543 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
544 u32 portid, u32 seq, int event, u32 flags,
545 int family, const struct nft_table *table)
547 struct nlmsghdr *nlh;
548 struct nfgenmsg *nfmsg;
550 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
551 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
553 goto nla_put_failure;
555 nfmsg = nlmsg_data(nlh);
556 nfmsg->nfgen_family = family;
557 nfmsg->version = NFNETLINK_V0;
558 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
560 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
561 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
562 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
563 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
565 goto nla_put_failure;
571 nlmsg_trim(skb, nlh);
575 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
581 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
584 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
588 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
589 event, 0, ctx->family, ctx->table);
595 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
596 ctx->report, GFP_KERNEL);
599 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
602 static int nf_tables_dump_tables(struct sk_buff *skb,
603 struct netlink_callback *cb)
605 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
606 const struct nft_table *table;
607 unsigned int idx = 0, s_idx = cb->args[0];
608 struct net *net = sock_net(skb->sk);
609 int family = nfmsg->nfgen_family;
612 cb->seq = net->nft.base_seq;
614 list_for_each_entry_rcu(table, &net->nft.tables, list) {
615 if (family != NFPROTO_UNSPEC && family != table->family)
621 memset(&cb->args[1], 0,
622 sizeof(cb->args) - sizeof(cb->args[0]));
623 if (!nft_is_active(net, table))
625 if (nf_tables_fill_table_info(skb, net,
626 NETLINK_CB(cb->skb).portid,
628 NFT_MSG_NEWTABLE, NLM_F_MULTI,
629 table->family, table) < 0)
632 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
642 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
643 const struct nlmsghdr *nlh,
644 struct netlink_dump_control *c)
648 if (!try_module_get(THIS_MODULE))
652 err = netlink_dump_start(nlsk, skb, nlh, c);
654 module_put(THIS_MODULE);
659 /* called with rcu_read_lock held */
660 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
661 struct sk_buff *skb, const struct nlmsghdr *nlh,
662 const struct nlattr * const nla[],
663 struct netlink_ext_ack *extack)
665 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
666 u8 genmask = nft_genmask_cur(net);
667 const struct nft_table *table;
668 struct sk_buff *skb2;
669 int family = nfmsg->nfgen_family;
672 if (nlh->nlmsg_flags & NLM_F_DUMP) {
673 struct netlink_dump_control c = {
674 .dump = nf_tables_dump_tables,
675 .module = THIS_MODULE,
678 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
681 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
683 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
684 return PTR_ERR(table);
687 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
691 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
692 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
697 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
704 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
706 struct nft_chain *chain;
709 list_for_each_entry(chain, &table->chains, list) {
710 if (!nft_is_active_next(net, chain))
712 if (!nft_is_base_chain(chain))
715 if (cnt && i++ == cnt)
718 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
722 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
724 struct nft_chain *chain;
727 list_for_each_entry(chain, &table->chains, list) {
728 if (!nft_is_active_next(net, chain))
730 if (!nft_is_base_chain(chain))
733 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
742 nft_table_disable(net, table, i);
746 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
748 nft_table_disable(net, table, 0);
751 static int nf_tables_updtable(struct nft_ctx *ctx)
753 struct nft_trans *trans;
757 if (!ctx->nla[NFTA_TABLE_FLAGS])
760 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
761 if (flags & ~NFT_TABLE_F_DORMANT)
764 if (flags == ctx->table->flags)
767 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
768 sizeof(struct nft_trans_table));
772 if ((flags & NFT_TABLE_F_DORMANT) &&
773 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
774 nft_trans_table_enable(trans) = false;
775 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
776 ctx->table->flags & NFT_TABLE_F_DORMANT) {
777 ret = nf_tables_table_enable(ctx->net, ctx->table);
779 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
780 nft_trans_table_enable(trans) = true;
786 nft_trans_table_update(trans) = true;
787 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
790 nft_trans_destroy(trans);
794 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
796 const char *name = data;
798 return jhash(name, strlen(name), seed);
801 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
803 const struct nft_chain *chain = data;
805 return nft_chain_hash(chain->name, 0, seed);
808 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
811 const struct nft_chain *chain = ptr;
812 const char *name = arg->key;
814 return strcmp(chain->name, name);
817 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
818 struct sk_buff *skb, const struct nlmsghdr *nlh,
819 const struct nlattr * const nla[],
820 struct netlink_ext_ack *extack)
822 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
823 u8 genmask = nft_genmask_next(net);
824 int family = nfmsg->nfgen_family;
825 const struct nlattr *attr;
826 struct nft_table *table;
831 lockdep_assert_held(&net->nft.commit_mutex);
832 attr = nla[NFTA_TABLE_NAME];
833 table = nft_table_lookup(net, attr, family, genmask);
835 if (PTR_ERR(table) != -ENOENT)
836 return PTR_ERR(table);
838 if (nlh->nlmsg_flags & NLM_F_EXCL) {
839 NL_SET_BAD_ATTR(extack, attr);
842 if (nlh->nlmsg_flags & NLM_F_REPLACE)
845 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
846 return nf_tables_updtable(&ctx);
849 if (nla[NFTA_TABLE_FLAGS]) {
850 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
851 if (flags & ~NFT_TABLE_F_DORMANT)
856 table = kzalloc(sizeof(*table), GFP_KERNEL);
860 table->name = nla_strdup(attr, GFP_KERNEL);
861 if (table->name == NULL)
864 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
868 INIT_LIST_HEAD(&table->chains);
869 INIT_LIST_HEAD(&table->sets);
870 INIT_LIST_HEAD(&table->objects);
871 INIT_LIST_HEAD(&table->flowtables);
872 table->family = family;
873 table->flags = flags;
874 table->handle = ++table_handle;
876 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
877 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
881 list_add_tail_rcu(&table->list, &net->nft.tables);
884 rhltable_destroy(&table->chains_ht);
893 static int nft_flush_table(struct nft_ctx *ctx)
895 struct nft_flowtable *flowtable, *nft;
896 struct nft_chain *chain, *nc;
897 struct nft_object *obj, *ne;
898 struct nft_set *set, *ns;
901 list_for_each_entry(chain, &ctx->table->chains, list) {
902 if (!nft_is_active_next(ctx->net, chain))
907 err = nft_delrule_by_chain(ctx);
912 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
913 if (!nft_is_active_next(ctx->net, set))
916 if (nft_set_is_anonymous(set) &&
917 !list_empty(&set->bindings))
920 err = nft_delset(ctx, set);
925 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
926 err = nft_delflowtable(ctx, flowtable);
931 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
932 err = nft_delobj(ctx, obj);
937 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
938 if (!nft_is_active_next(ctx->net, chain))
943 err = nft_delchain(ctx);
948 err = nft_deltable(ctx);
953 static int nft_flush(struct nft_ctx *ctx, int family)
955 struct nft_table *table, *nt;
956 const struct nlattr * const *nla = ctx->nla;
959 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
960 if (family != AF_UNSPEC && table->family != family)
963 ctx->family = table->family;
965 if (!nft_is_active_next(ctx->net, table))
968 if (nla[NFTA_TABLE_NAME] &&
969 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
974 err = nft_flush_table(ctx);
982 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
983 struct sk_buff *skb, const struct nlmsghdr *nlh,
984 const struct nlattr * const nla[],
985 struct netlink_ext_ack *extack)
987 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
988 u8 genmask = nft_genmask_next(net);
989 int family = nfmsg->nfgen_family;
990 const struct nlattr *attr;
991 struct nft_table *table;
994 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
995 if (family == AF_UNSPEC ||
996 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
997 return nft_flush(&ctx, family);
999 if (nla[NFTA_TABLE_HANDLE]) {
1000 attr = nla[NFTA_TABLE_HANDLE];
1001 table = nft_table_lookup_byhandle(net, attr, genmask);
1003 attr = nla[NFTA_TABLE_NAME];
1004 table = nft_table_lookup(net, attr, family, genmask);
1007 if (IS_ERR(table)) {
1008 NL_SET_BAD_ATTR(extack, attr);
1009 return PTR_ERR(table);
1012 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1016 ctx.family = family;
1019 return nft_flush_table(&ctx);
1022 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1024 if (WARN_ON(ctx->table->use > 0))
1027 rhltable_destroy(&ctx->table->chains_ht);
1028 kfree(ctx->table->name);
1032 void nft_register_chain_type(const struct nft_chain_type *ctype)
1034 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
1037 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1038 if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) {
1039 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1042 chain_type[ctype->family][ctype->type] = ctype;
1043 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1045 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1047 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1049 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1050 chain_type[ctype->family][ctype->type] = NULL;
1051 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1053 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1059 static struct nft_chain *
1060 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1062 struct nft_chain *chain;
1064 list_for_each_entry(chain, &table->chains, list) {
1065 if (chain->handle == handle &&
1066 nft_active_genmask(chain, genmask))
1070 return ERR_PTR(-ENOENT);
1073 static bool lockdep_commit_lock_is_held(struct net *net)
1075 #ifdef CONFIG_PROVE_LOCKING
1076 return lockdep_is_held(&net->nft.commit_mutex);
1082 static struct nft_chain *nft_chain_lookup(struct net *net,
1083 struct nft_table *table,
1084 const struct nlattr *nla, u8 genmask)
1086 char search[NFT_CHAIN_MAXNAMELEN + 1];
1087 struct rhlist_head *tmp, *list;
1088 struct nft_chain *chain;
1091 return ERR_PTR(-EINVAL);
1093 nla_strlcpy(search, nla, sizeof(search));
1095 WARN_ON(!rcu_read_lock_held() &&
1096 !lockdep_commit_lock_is_held(net));
1098 chain = ERR_PTR(-ENOENT);
1100 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1104 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1105 if (nft_active_genmask(chain, genmask))
1108 chain = ERR_PTR(-ENOENT);
1114 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1115 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1116 .len = NFT_TABLE_MAXNAMELEN - 1 },
1117 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1118 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1119 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1120 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1121 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1122 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
1123 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1126 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1127 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1128 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1129 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1130 .len = IFNAMSIZ - 1 },
1133 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1135 struct nft_stats *cpu_stats, total;
1136 struct nlattr *nest;
1141 memset(&total, 0, sizeof(total));
1142 for_each_possible_cpu(cpu) {
1143 cpu_stats = per_cpu_ptr(stats, cpu);
1145 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1146 pkts = cpu_stats->pkts;
1147 bytes = cpu_stats->bytes;
1148 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1150 total.bytes += bytes;
1152 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
1154 goto nla_put_failure;
1156 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1157 NFTA_COUNTER_PAD) ||
1158 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1160 goto nla_put_failure;
1162 nla_nest_end(skb, nest);
1169 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1170 u32 portid, u32 seq, int event, u32 flags,
1171 int family, const struct nft_table *table,
1172 const struct nft_chain *chain)
1174 struct nlmsghdr *nlh;
1175 struct nfgenmsg *nfmsg;
1177 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1178 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1180 goto nla_put_failure;
1182 nfmsg = nlmsg_data(nlh);
1183 nfmsg->nfgen_family = family;
1184 nfmsg->version = NFNETLINK_V0;
1185 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1187 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1188 goto nla_put_failure;
1189 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1191 goto nla_put_failure;
1192 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1193 goto nla_put_failure;
1195 if (nft_is_base_chain(chain)) {
1196 const struct nft_base_chain *basechain = nft_base_chain(chain);
1197 const struct nf_hook_ops *ops = &basechain->ops;
1198 struct nlattr *nest;
1200 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1202 goto nla_put_failure;
1203 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1204 goto nla_put_failure;
1205 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1206 goto nla_put_failure;
1207 if (basechain->dev_name[0] &&
1208 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1209 goto nla_put_failure;
1210 nla_nest_end(skb, nest);
1212 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1213 htonl(basechain->policy)))
1214 goto nla_put_failure;
1216 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1217 goto nla_put_failure;
1219 if (rcu_access_pointer(basechain->stats) &&
1220 nft_dump_stats(skb, rcu_dereference(basechain->stats)))
1221 goto nla_put_failure;
1224 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1225 goto nla_put_failure;
1227 nlmsg_end(skb, nlh);
1231 nlmsg_trim(skb, nlh);
1235 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1237 struct sk_buff *skb;
1241 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1244 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1248 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1249 event, 0, ctx->family, ctx->table,
1256 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1257 ctx->report, GFP_KERNEL);
1260 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1263 static int nf_tables_dump_chains(struct sk_buff *skb,
1264 struct netlink_callback *cb)
1266 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1267 const struct nft_table *table;
1268 const struct nft_chain *chain;
1269 unsigned int idx = 0, s_idx = cb->args[0];
1270 struct net *net = sock_net(skb->sk);
1271 int family = nfmsg->nfgen_family;
1274 cb->seq = net->nft.base_seq;
1276 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1277 if (family != NFPROTO_UNSPEC && family != table->family)
1280 list_for_each_entry_rcu(chain, &table->chains, list) {
1284 memset(&cb->args[1], 0,
1285 sizeof(cb->args) - sizeof(cb->args[0]));
1286 if (!nft_is_active(net, chain))
1288 if (nf_tables_fill_chain_info(skb, net,
1289 NETLINK_CB(cb->skb).portid,
1293 table->family, table,
1297 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1308 /* called with rcu_read_lock held */
1309 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1310 struct sk_buff *skb, const struct nlmsghdr *nlh,
1311 const struct nlattr * const nla[],
1312 struct netlink_ext_ack *extack)
1314 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1315 u8 genmask = nft_genmask_cur(net);
1316 const struct nft_chain *chain;
1317 struct nft_table *table;
1318 struct sk_buff *skb2;
1319 int family = nfmsg->nfgen_family;
1322 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1323 struct netlink_dump_control c = {
1324 .dump = nf_tables_dump_chains,
1325 .module = THIS_MODULE,
1328 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1331 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1332 if (IS_ERR(table)) {
1333 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1334 return PTR_ERR(table);
1337 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1338 if (IS_ERR(chain)) {
1339 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1340 return PTR_ERR(chain);
1343 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1347 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1348 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1349 family, table, chain);
1353 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1360 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1361 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1362 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1365 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1367 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1368 struct nft_stats __percpu *newstats;
1369 struct nft_stats *stats;
1372 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1375 return ERR_PTR(err);
1377 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1378 return ERR_PTR(-EINVAL);
1380 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1381 if (newstats == NULL)
1382 return ERR_PTR(-ENOMEM);
1384 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1385 * are not exposed to userspace.
1388 stats = this_cpu_ptr(newstats);
1389 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1390 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1396 static void nft_chain_stats_replace(struct net *net,
1397 struct nft_base_chain *chain,
1398 struct nft_stats __percpu *newstats)
1400 struct nft_stats __percpu *oldstats;
1402 if (newstats == NULL)
1405 if (rcu_access_pointer(chain->stats)) {
1406 oldstats = rcu_dereference_protected(chain->stats,
1407 lockdep_commit_lock_is_held(net));
1408 rcu_assign_pointer(chain->stats, newstats);
1410 free_percpu(oldstats);
1412 rcu_assign_pointer(chain->stats, newstats);
1413 static_branch_inc(&nft_counters_enabled);
1417 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1419 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1420 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1426 /* should be NULL either via abort or via successful commit */
1427 WARN_ON_ONCE(chain->rules_next);
1428 kvfree(chain->rules_next);
1431 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1433 struct nft_chain *chain = ctx->chain;
1435 if (WARN_ON(chain->use > 0))
1438 /* no concurrent access possible anymore */
1439 nf_tables_chain_free_chain_rules(chain);
1441 if (nft_is_base_chain(chain)) {
1442 struct nft_base_chain *basechain = nft_base_chain(chain);
1444 module_put(basechain->type->owner);
1445 if (rcu_access_pointer(basechain->stats)) {
1446 static_branch_dec(&nft_counters_enabled);
1447 free_percpu(rcu_dereference_raw(basechain->stats));
1457 struct nft_chain_hook {
1460 const struct nft_chain_type *type;
1461 struct net_device *dev;
1464 static int nft_chain_parse_hook(struct net *net,
1465 const struct nlattr * const nla[],
1466 struct nft_chain_hook *hook, u8 family,
1469 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1470 const struct nft_chain_type *type;
1471 struct net_device *dev;
1474 lockdep_assert_held(&net->nft.commit_mutex);
1475 lockdep_nfnl_nft_mutex_not_held();
1477 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1478 nft_hook_policy, NULL);
1482 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1483 ha[NFTA_HOOK_PRIORITY] == NULL)
1486 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1487 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1489 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1490 if (nla[NFTA_CHAIN_TYPE]) {
1491 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1494 return PTR_ERR(type);
1496 if (!(type->hook_mask & (1 << hook->num)))
1499 if (type->type == NFT_CHAIN_T_NAT &&
1500 hook->priority <= NF_IP_PRI_CONNTRACK)
1503 if (!try_module_get(type->owner))
1509 if (family == NFPROTO_NETDEV) {
1510 char ifname[IFNAMSIZ];
1512 if (!ha[NFTA_HOOK_DEV]) {
1513 module_put(type->owner);
1517 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1518 dev = __dev_get_by_name(net, ifname);
1520 module_put(type->owner);
1524 } else if (ha[NFTA_HOOK_DEV]) {
1525 module_put(type->owner);
1532 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1534 module_put(hook->type->owner);
1537 struct nft_rules_old {
1539 struct nft_rule **start;
1542 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1545 if (alloc > INT_MAX)
1548 alloc += 1; /* NULL, ends rules */
1549 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1552 alloc *= sizeof(struct nft_rule *);
1553 alloc += sizeof(struct nft_rules_old);
1555 return kvmalloc(alloc, GFP_KERNEL);
1558 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1561 const struct nlattr * const *nla = ctx->nla;
1562 struct nft_table *table = ctx->table;
1563 struct nft_base_chain *basechain;
1564 struct nft_stats __percpu *stats;
1565 struct net *net = ctx->net;
1566 struct nft_chain *chain;
1567 struct nft_rule **rules;
1570 if (table->use == UINT_MAX)
1573 if (nla[NFTA_CHAIN_HOOK]) {
1574 struct nft_chain_hook hook;
1575 struct nf_hook_ops *ops;
1577 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1581 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1582 if (basechain == NULL) {
1583 nft_chain_release_hook(&hook);
1587 if (hook.dev != NULL)
1588 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1590 if (nla[NFTA_CHAIN_COUNTERS]) {
1591 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1592 if (IS_ERR(stats)) {
1593 nft_chain_release_hook(&hook);
1595 return PTR_ERR(stats);
1597 rcu_assign_pointer(basechain->stats, stats);
1598 static_branch_inc(&nft_counters_enabled);
1601 basechain->type = hook.type;
1602 chain = &basechain->chain;
1604 ops = &basechain->ops;
1606 ops->hooknum = hook.num;
1607 ops->priority = hook.priority;
1609 ops->hook = hook.type->hooks[ops->hooknum];
1610 ops->dev = hook.dev;
1612 chain->flags |= NFT_BASE_CHAIN;
1613 basechain->policy = policy;
1615 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1621 INIT_LIST_HEAD(&chain->rules);
1622 chain->handle = nf_tables_alloc_handle(table);
1623 chain->table = table;
1624 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1630 rules = nf_tables_chain_alloc_rules(chain, 0);
1637 rcu_assign_pointer(chain->rules_gen_0, rules);
1638 rcu_assign_pointer(chain->rules_gen_1, rules);
1640 err = nf_tables_register_hook(net, table, chain);
1644 err = rhltable_insert_key(&table->chains_ht, chain->name,
1645 &chain->rhlhead, nft_chain_ht_params);
1649 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1651 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1652 nft_chain_ht_params);
1657 list_add_tail_rcu(&chain->list, &table->chains);
1661 nf_tables_unregister_hook(net, table, chain);
1663 nf_tables_chain_destroy(ctx);
1668 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy)
1670 const struct nlattr * const *nla = ctx->nla;
1671 struct nft_table *table = ctx->table;
1672 struct nft_chain *chain = ctx->chain;
1673 struct nft_base_chain *basechain;
1674 struct nft_stats *stats = NULL;
1675 struct nft_chain_hook hook;
1676 struct nf_hook_ops *ops;
1677 struct nft_trans *trans;
1680 if (nla[NFTA_CHAIN_HOOK]) {
1681 if (!nft_is_base_chain(chain))
1684 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
1689 basechain = nft_base_chain(chain);
1690 if (basechain->type != hook.type) {
1691 nft_chain_release_hook(&hook);
1695 ops = &basechain->ops;
1696 if (ops->hooknum != hook.num ||
1697 ops->priority != hook.priority ||
1698 ops->dev != hook.dev) {
1699 nft_chain_release_hook(&hook);
1702 nft_chain_release_hook(&hook);
1705 if (nla[NFTA_CHAIN_HANDLE] &&
1706 nla[NFTA_CHAIN_NAME]) {
1707 struct nft_chain *chain2;
1709 chain2 = nft_chain_lookup(ctx->net, table,
1710 nla[NFTA_CHAIN_NAME], genmask);
1711 if (!IS_ERR(chain2))
1715 if (nla[NFTA_CHAIN_COUNTERS]) {
1716 if (!nft_is_base_chain(chain))
1719 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1721 return PTR_ERR(stats);
1725 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1726 sizeof(struct nft_trans_chain));
1730 nft_trans_chain_stats(trans) = stats;
1731 nft_trans_chain_update(trans) = true;
1733 if (nla[NFTA_CHAIN_POLICY])
1734 nft_trans_chain_policy(trans) = policy;
1736 nft_trans_chain_policy(trans) = -1;
1738 if (nla[NFTA_CHAIN_HANDLE] &&
1739 nla[NFTA_CHAIN_NAME]) {
1740 struct nft_trans *tmp;
1744 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1749 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
1750 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
1751 tmp->ctx.table == table &&
1752 nft_trans_chain_update(tmp) &&
1753 nft_trans_chain_name(tmp) &&
1754 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
1760 nft_trans_chain_name(trans) = name;
1762 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1771 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1772 struct sk_buff *skb, const struct nlmsghdr *nlh,
1773 const struct nlattr * const nla[],
1774 struct netlink_ext_ack *extack)
1776 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1777 u8 genmask = nft_genmask_next(net);
1778 int family = nfmsg->nfgen_family;
1779 const struct nlattr *attr;
1780 struct nft_table *table;
1781 struct nft_chain *chain;
1782 u8 policy = NF_ACCEPT;
1786 lockdep_assert_held(&net->nft.commit_mutex);
1788 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1789 if (IS_ERR(table)) {
1790 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1791 return PTR_ERR(table);
1795 attr = nla[NFTA_CHAIN_NAME];
1797 if (nla[NFTA_CHAIN_HANDLE]) {
1798 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1799 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1800 if (IS_ERR(chain)) {
1801 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
1802 return PTR_ERR(chain);
1804 attr = nla[NFTA_CHAIN_HANDLE];
1806 chain = nft_chain_lookup(net, table, attr, genmask);
1807 if (IS_ERR(chain)) {
1808 if (PTR_ERR(chain) != -ENOENT) {
1809 NL_SET_BAD_ATTR(extack, attr);
1810 return PTR_ERR(chain);
1816 if (nla[NFTA_CHAIN_POLICY]) {
1817 if (chain != NULL &&
1818 !nft_is_base_chain(chain)) {
1819 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1823 if (chain == NULL &&
1824 nla[NFTA_CHAIN_HOOK] == NULL) {
1825 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1829 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1839 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1841 if (chain != NULL) {
1842 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1843 NL_SET_BAD_ATTR(extack, attr);
1846 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1849 return nf_tables_updchain(&ctx, genmask, policy);
1852 return nf_tables_addchain(&ctx, family, genmask, policy);
1855 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1856 struct sk_buff *skb, const struct nlmsghdr *nlh,
1857 const struct nlattr * const nla[],
1858 struct netlink_ext_ack *extack)
1860 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1861 u8 genmask = nft_genmask_next(net);
1862 int family = nfmsg->nfgen_family;
1863 const struct nlattr *attr;
1864 struct nft_table *table;
1865 struct nft_chain *chain;
1866 struct nft_rule *rule;
1872 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1873 if (IS_ERR(table)) {
1874 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1875 return PTR_ERR(table);
1878 if (nla[NFTA_CHAIN_HANDLE]) {
1879 attr = nla[NFTA_CHAIN_HANDLE];
1880 handle = be64_to_cpu(nla_get_be64(attr));
1881 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1883 attr = nla[NFTA_CHAIN_NAME];
1884 chain = nft_chain_lookup(net, table, attr, genmask);
1886 if (IS_ERR(chain)) {
1887 NL_SET_BAD_ATTR(extack, attr);
1888 return PTR_ERR(chain);
1891 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1895 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1898 list_for_each_entry(rule, &chain->rules, list) {
1899 if (!nft_is_active_next(net, rule))
1903 err = nft_delrule(&ctx, rule);
1908 /* There are rules and elements that are still holding references to us,
1909 * we cannot do a recursive removal in this case.
1912 NL_SET_BAD_ATTR(extack, attr);
1916 return nft_delchain(&ctx);
1924 * nft_register_expr - register nf_tables expr type
1927 * Registers the expr type for use with nf_tables. Returns zero on
1928 * success or a negative errno code otherwise.
1930 int nft_register_expr(struct nft_expr_type *type)
1932 if (!nft_expr_check_ops(type->ops))
1935 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1936 if (type->family == NFPROTO_UNSPEC)
1937 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1939 list_add_rcu(&type->list, &nf_tables_expressions);
1940 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1943 EXPORT_SYMBOL_GPL(nft_register_expr);
1946 * nft_unregister_expr - unregister nf_tables expr type
1949 * Unregisters the expr typefor use with nf_tables.
1951 void nft_unregister_expr(struct nft_expr_type *type)
1953 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1954 list_del_rcu(&type->list);
1955 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1957 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1959 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1962 const struct nft_expr_type *type;
1964 list_for_each_entry(type, &nf_tables_expressions, list) {
1965 if (!nla_strcmp(nla, type->name) &&
1966 (!type->family || type->family == family))
1972 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
1976 const struct nft_expr_type *type;
1979 return ERR_PTR(-EINVAL);
1981 type = __nft_expr_type_get(family, nla);
1982 if (type != NULL && try_module_get(type->owner))
1985 lockdep_nfnl_nft_mutex_not_held();
1986 #ifdef CONFIG_MODULES
1988 nft_request_module(net, "nft-expr-%u-%.*s", family,
1989 nla_len(nla), (char *)nla_data(nla));
1990 if (__nft_expr_type_get(family, nla))
1991 return ERR_PTR(-EAGAIN);
1993 nft_request_module(net, "nft-expr-%.*s",
1994 nla_len(nla), (char *)nla_data(nla));
1995 if (__nft_expr_type_get(family, nla))
1996 return ERR_PTR(-EAGAIN);
1999 return ERR_PTR(-ENOENT);
2002 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2003 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
2004 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2007 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2008 const struct nft_expr *expr)
2010 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2011 goto nla_put_failure;
2013 if (expr->ops->dump) {
2014 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
2016 goto nla_put_failure;
2017 if (expr->ops->dump(skb, expr) < 0)
2018 goto nla_put_failure;
2019 nla_nest_end(skb, data);
2028 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2029 const struct nft_expr *expr)
2031 struct nlattr *nest;
2033 nest = nla_nest_start(skb, attr);
2035 goto nla_put_failure;
2036 if (nf_tables_fill_expr_info(skb, expr) < 0)
2037 goto nla_put_failure;
2038 nla_nest_end(skb, nest);
2045 struct nft_expr_info {
2046 const struct nft_expr_ops *ops;
2047 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2050 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2051 const struct nlattr *nla,
2052 struct nft_expr_info *info)
2054 const struct nft_expr_type *type;
2055 const struct nft_expr_ops *ops;
2056 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2059 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
2063 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2065 return PTR_ERR(type);
2067 if (tb[NFTA_EXPR_DATA]) {
2068 err = nla_parse_nested(info->tb, type->maxattr,
2069 tb[NFTA_EXPR_DATA], type->policy, NULL);
2073 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2075 if (type->select_ops != NULL) {
2076 ops = type->select_ops(ctx,
2077 (const struct nlattr * const *)info->tb);
2082 if (!nft_expr_check_ops(ops)) {
2093 module_put(type->owner);
2097 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2098 const struct nft_expr_info *info,
2099 struct nft_expr *expr)
2101 const struct nft_expr_ops *ops = info->ops;
2106 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2117 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2118 struct nft_expr *expr)
2120 if (expr->ops->destroy)
2121 expr->ops->destroy(ctx, expr);
2122 module_put(expr->ops->type->owner);
2125 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2126 const struct nlattr *nla)
2128 struct nft_expr_info info;
2129 struct nft_expr *expr;
2132 err = nf_tables_expr_parse(ctx, nla, &info);
2137 expr = kzalloc(info.ops->size, GFP_KERNEL);
2141 err = nf_tables_newexpr(ctx, &info, expr);
2149 module_put(info.ops->type->owner);
2151 return ERR_PTR(err);
2154 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2156 nf_tables_expr_destroy(ctx, expr);
2164 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2167 struct nft_rule *rule;
2169 // FIXME: this sucks
2170 list_for_each_entry_rcu(rule, &chain->rules, list) {
2171 if (handle == rule->handle)
2175 return ERR_PTR(-ENOENT);
2178 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2179 const struct nlattr *nla)
2182 return ERR_PTR(-EINVAL);
2184 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2187 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2188 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2189 .len = NFT_TABLE_MAXNAMELEN - 1 },
2190 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2191 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2192 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2193 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2194 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2195 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2196 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2197 .len = NFT_USERDATA_MAXLEN },
2198 [NFTA_RULE_ID] = { .type = NLA_U32 },
2201 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2202 u32 portid, u32 seq, int event,
2203 u32 flags, int family,
2204 const struct nft_table *table,
2205 const struct nft_chain *chain,
2206 const struct nft_rule *rule)
2208 struct nlmsghdr *nlh;
2209 struct nfgenmsg *nfmsg;
2210 const struct nft_expr *expr, *next;
2211 struct nlattr *list;
2212 const struct nft_rule *prule;
2213 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2215 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2217 goto nla_put_failure;
2219 nfmsg = nlmsg_data(nlh);
2220 nfmsg->nfgen_family = family;
2221 nfmsg->version = NFNETLINK_V0;
2222 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2224 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2225 goto nla_put_failure;
2226 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2227 goto nla_put_failure;
2228 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2230 goto nla_put_failure;
2232 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
2233 prule = list_prev_entry(rule, list);
2234 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2235 cpu_to_be64(prule->handle),
2237 goto nla_put_failure;
2240 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
2242 goto nla_put_failure;
2243 nft_rule_for_each_expr(expr, next, rule) {
2244 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2245 goto nla_put_failure;
2247 nla_nest_end(skb, list);
2250 struct nft_userdata *udata = nft_userdata(rule);
2251 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2253 goto nla_put_failure;
2256 nlmsg_end(skb, nlh);
2260 nlmsg_trim(skb, nlh);
2264 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2265 const struct nft_rule *rule, int event)
2267 struct sk_buff *skb;
2271 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2274 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2278 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2279 event, 0, ctx->family, ctx->table,
2286 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2287 ctx->report, GFP_KERNEL);
2290 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2293 struct nft_rule_dump_ctx {
2298 static int __nf_tables_dump_rules(struct sk_buff *skb,
2300 struct netlink_callback *cb,
2301 const struct nft_table *table,
2302 const struct nft_chain *chain)
2304 struct net *net = sock_net(skb->sk);
2305 unsigned int s_idx = cb->args[0];
2306 const struct nft_rule *rule;
2309 list_for_each_entry_rcu(rule, &chain->rules, list) {
2310 if (!nft_is_active(net, rule))
2315 memset(&cb->args[1], 0,
2316 sizeof(cb->args) - sizeof(cb->args[0]));
2318 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2321 NLM_F_MULTI | NLM_F_APPEND,
2323 table, chain, rule) < 0)
2324 goto out_unfinished;
2326 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2336 static int nf_tables_dump_rules(struct sk_buff *skb,
2337 struct netlink_callback *cb)
2339 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2340 const struct nft_rule_dump_ctx *ctx = cb->data;
2341 struct nft_table *table;
2342 const struct nft_chain *chain;
2343 unsigned int idx = 0;
2344 struct net *net = sock_net(skb->sk);
2345 int family = nfmsg->nfgen_family;
2348 cb->seq = net->nft.base_seq;
2350 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2351 if (family != NFPROTO_UNSPEC && family != table->family)
2354 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2357 if (ctx && ctx->chain) {
2358 struct rhlist_head *list, *tmp;
2360 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2361 nft_chain_ht_params);
2365 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2366 if (!nft_is_active(net, chain))
2368 __nf_tables_dump_rules(skb, &idx,
2375 list_for_each_entry_rcu(chain, &table->chains, list) {
2376 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2380 if (ctx && ctx->table)
2388 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2390 const struct nlattr * const *nla = cb->data;
2391 struct nft_rule_dump_ctx *ctx = NULL;
2393 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2394 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2398 if (nla[NFTA_RULE_TABLE]) {
2399 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2406 if (nla[NFTA_RULE_CHAIN]) {
2407 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2421 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2423 struct nft_rule_dump_ctx *ctx = cb->data;
2433 /* called with rcu_read_lock held */
2434 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2435 struct sk_buff *skb, const struct nlmsghdr *nlh,
2436 const struct nlattr * const nla[],
2437 struct netlink_ext_ack *extack)
2439 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2440 u8 genmask = nft_genmask_cur(net);
2441 const struct nft_chain *chain;
2442 const struct nft_rule *rule;
2443 struct nft_table *table;
2444 struct sk_buff *skb2;
2445 int family = nfmsg->nfgen_family;
2448 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2449 struct netlink_dump_control c = {
2450 .start= nf_tables_dump_rules_start,
2451 .dump = nf_tables_dump_rules,
2452 .done = nf_tables_dump_rules_done,
2453 .module = THIS_MODULE,
2454 .data = (void *)nla,
2457 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2460 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2461 if (IS_ERR(table)) {
2462 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2463 return PTR_ERR(table);
2466 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2467 if (IS_ERR(chain)) {
2468 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2469 return PTR_ERR(chain);
2472 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2474 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2475 return PTR_ERR(rule);
2478 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2482 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2483 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2484 family, table, chain, rule);
2488 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2495 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2496 struct nft_rule *rule)
2498 struct nft_expr *expr, *next;
2501 * Careful: some expressions might not be initialized in case this
2502 * is called on error from nf_tables_newrule().
2504 expr = nft_expr_first(rule);
2505 while (expr != nft_expr_last(rule) && expr->ops) {
2506 next = nft_expr_next(expr);
2507 nf_tables_expr_destroy(ctx, expr);
2513 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2514 struct nft_rule *rule)
2516 nft_rule_expr_deactivate(ctx, rule);
2517 nf_tables_rule_destroy(ctx, rule);
2520 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2522 struct nft_expr *expr, *last;
2523 const struct nft_data *data;
2524 struct nft_rule *rule;
2527 if (ctx->level == NFT_JUMP_STACK_SIZE)
2530 list_for_each_entry(rule, &chain->rules, list) {
2531 if (!nft_is_active_next(ctx->net, rule))
2534 nft_rule_for_each_expr(expr, last, rule) {
2535 if (!expr->ops->validate)
2538 err = expr->ops->validate(ctx, expr, &data);
2546 EXPORT_SYMBOL_GPL(nft_chain_validate);
2548 static int nft_table_validate(struct net *net, const struct nft_table *table)
2550 struct nft_chain *chain;
2551 struct nft_ctx ctx = {
2553 .family = table->family,
2557 list_for_each_entry(chain, &table->chains, list) {
2558 if (!nft_is_base_chain(chain))
2562 err = nft_chain_validate(&ctx, chain);
2570 #define NFT_RULE_MAXEXPRS 128
2572 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2573 struct sk_buff *skb, const struct nlmsghdr *nlh,
2574 const struct nlattr * const nla[],
2575 struct netlink_ext_ack *extack)
2577 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2578 u8 genmask = nft_genmask_next(net);
2579 struct nft_expr_info *info = NULL;
2580 int family = nfmsg->nfgen_family;
2581 struct nft_table *table;
2582 struct nft_chain *chain;
2583 struct nft_rule *rule, *old_rule = NULL;
2584 struct nft_userdata *udata;
2585 struct nft_trans *trans = NULL;
2586 struct nft_expr *expr;
2589 unsigned int size, i, n, ulen = 0, usize = 0;
2591 u64 handle, pos_handle;
2593 lockdep_assert_held(&net->nft.commit_mutex);
2595 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2596 if (IS_ERR(table)) {
2597 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2598 return PTR_ERR(table);
2601 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2602 if (IS_ERR(chain)) {
2603 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2604 return PTR_ERR(chain);
2607 if (nla[NFTA_RULE_HANDLE]) {
2608 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2609 rule = __nft_rule_lookup(chain, handle);
2611 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2612 return PTR_ERR(rule);
2615 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2616 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2619 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2624 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
2625 nlh->nlmsg_flags & NLM_F_REPLACE)
2627 handle = nf_tables_alloc_handle(table);
2629 if (chain->use == UINT_MAX)
2632 if (nla[NFTA_RULE_POSITION]) {
2633 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2634 old_rule = __nft_rule_lookup(chain, pos_handle);
2635 if (IS_ERR(old_rule)) {
2636 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
2637 return PTR_ERR(old_rule);
2642 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2646 if (nla[NFTA_RULE_EXPRESSIONS]) {
2647 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
2648 sizeof(struct nft_expr_info),
2653 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2655 if (nla_type(tmp) != NFTA_LIST_ELEM)
2657 if (n == NFT_RULE_MAXEXPRS)
2659 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2662 size += info[n].ops->size;
2666 /* Check for overflow of dlen field */
2668 if (size >= 1 << 12)
2671 if (nla[NFTA_RULE_USERDATA]) {
2672 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2674 usize = sizeof(struct nft_userdata) + ulen;
2678 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2682 nft_activate_next(net, rule);
2684 rule->handle = handle;
2686 rule->udata = ulen ? 1 : 0;
2689 udata = nft_userdata(rule);
2690 udata->len = ulen - 1;
2691 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2694 expr = nft_expr_first(rule);
2695 for (i = 0; i < n; i++) {
2696 err = nf_tables_newexpr(&ctx, &info[i], expr);
2700 if (info[i].ops->validate)
2701 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2704 expr = nft_expr_next(expr);
2707 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2708 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2709 if (trans == NULL) {
2713 err = nft_delrule(&ctx, old_rule);
2715 nft_trans_destroy(trans);
2719 list_add_tail_rcu(&rule->list, &old_rule->list);
2721 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2726 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2728 list_add_rcu(&rule->list, &old_rule->list);
2730 list_add_tail_rcu(&rule->list, &chain->rules);
2733 list_add_tail_rcu(&rule->list, &old_rule->list);
2735 list_add_rcu(&rule->list, &chain->rules);
2741 if (net->nft.validate_state == NFT_VALIDATE_DO)
2742 return nft_table_validate(net, table);
2746 nf_tables_rule_release(&ctx, rule);
2748 for (i = 0; i < n; i++) {
2749 if (info[i].ops != NULL)
2750 module_put(info[i].ops->type->owner);
2756 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2757 const struct nlattr *nla)
2759 u32 id = ntohl(nla_get_be32(nla));
2760 struct nft_trans *trans;
2762 list_for_each_entry(trans, &net->nft.commit_list, list) {
2763 struct nft_rule *rule = nft_trans_rule(trans);
2765 if (trans->msg_type == NFT_MSG_NEWRULE &&
2766 id == nft_trans_rule_id(trans))
2769 return ERR_PTR(-ENOENT);
2772 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2773 struct sk_buff *skb, const struct nlmsghdr *nlh,
2774 const struct nlattr * const nla[],
2775 struct netlink_ext_ack *extack)
2777 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2778 u8 genmask = nft_genmask_next(net);
2779 struct nft_table *table;
2780 struct nft_chain *chain = NULL;
2781 struct nft_rule *rule;
2782 int family = nfmsg->nfgen_family, err = 0;
2785 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2786 if (IS_ERR(table)) {
2787 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2788 return PTR_ERR(table);
2791 if (nla[NFTA_RULE_CHAIN]) {
2792 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
2794 if (IS_ERR(chain)) {
2795 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2796 return PTR_ERR(chain);
2800 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2803 if (nla[NFTA_RULE_HANDLE]) {
2804 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2806 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2807 return PTR_ERR(rule);
2810 err = nft_delrule(&ctx, rule);
2811 } else if (nla[NFTA_RULE_ID]) {
2812 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2814 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
2815 return PTR_ERR(rule);
2818 err = nft_delrule(&ctx, rule);
2820 err = nft_delrule_by_chain(&ctx);
2823 list_for_each_entry(chain, &table->chains, list) {
2824 if (!nft_is_active_next(net, chain))
2828 err = nft_delrule_by_chain(&ctx);
2841 static LIST_HEAD(nf_tables_set_types);
2843 int nft_register_set(struct nft_set_type *type)
2845 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2846 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2847 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2850 EXPORT_SYMBOL_GPL(nft_register_set);
2852 void nft_unregister_set(struct nft_set_type *type)
2854 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2855 list_del_rcu(&type->list);
2856 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2858 EXPORT_SYMBOL_GPL(nft_unregister_set);
2860 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2861 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2864 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2866 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2870 * Select a set implementation based on the data characteristics and the
2871 * given policy. The total memory use might not be known if no size is
2872 * given, in that case the amount of memory per element is used.
2874 static const struct nft_set_ops *
2875 nft_select_set_ops(const struct nft_ctx *ctx,
2876 const struct nlattr * const nla[],
2877 const struct nft_set_desc *desc,
2878 enum nft_set_policies policy)
2880 const struct nft_set_ops *ops, *bops;
2881 struct nft_set_estimate est, best;
2882 const struct nft_set_type *type;
2885 lockdep_assert_held(&ctx->net->nft.commit_mutex);
2886 lockdep_nfnl_nft_mutex_not_held();
2887 #ifdef CONFIG_MODULES
2888 if (list_empty(&nf_tables_set_types)) {
2889 nft_request_module(ctx->net, "nft-set");
2890 if (!list_empty(&nf_tables_set_types))
2891 return ERR_PTR(-EAGAIN);
2894 if (nla[NFTA_SET_FLAGS] != NULL)
2895 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2902 list_for_each_entry(type, &nf_tables_set_types, list) {
2905 if (!nft_set_ops_candidate(type, flags))
2907 if (!ops->estimate(desc, flags, &est))
2911 case NFT_SET_POL_PERFORMANCE:
2912 if (est.lookup < best.lookup)
2914 if (est.lookup == best.lookup &&
2915 est.space < best.space)
2918 case NFT_SET_POL_MEMORY:
2920 if (est.space < best.space)
2922 if (est.space == best.space &&
2923 est.lookup < best.lookup)
2925 } else if (est.size < best.size || !bops) {
2933 if (!try_module_get(type->owner))
2936 module_put(to_set_type(bops)->owner);
2945 return ERR_PTR(-EOPNOTSUPP);
2948 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2949 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2950 .len = NFT_TABLE_MAXNAMELEN - 1 },
2951 [NFTA_SET_NAME] = { .type = NLA_STRING,
2952 .len = NFT_SET_MAXNAMELEN - 1 },
2953 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2954 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2955 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2956 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2957 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2958 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2959 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2960 [NFTA_SET_ID] = { .type = NLA_U32 },
2961 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2962 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2963 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2964 .len = NFT_USERDATA_MAXLEN },
2965 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2966 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
2969 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2970 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2973 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2974 const struct sk_buff *skb,
2975 const struct nlmsghdr *nlh,
2976 const struct nlattr * const nla[],
2977 struct netlink_ext_ack *extack,
2980 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2981 int family = nfmsg->nfgen_family;
2982 struct nft_table *table = NULL;
2984 if (nla[NFTA_SET_TABLE] != NULL) {
2985 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
2987 if (IS_ERR(table)) {
2988 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
2989 return PTR_ERR(table);
2993 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
2997 static struct nft_set *nft_set_lookup(const struct nft_table *table,
2998 const struct nlattr *nla, u8 genmask)
3000 struct nft_set *set;
3003 return ERR_PTR(-EINVAL);
3005 list_for_each_entry_rcu(set, &table->sets, list) {
3006 if (!nla_strcmp(nla, set->name) &&
3007 nft_active_genmask(set, genmask))
3010 return ERR_PTR(-ENOENT);
3013 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3014 const struct nlattr *nla,
3017 struct nft_set *set;
3019 list_for_each_entry(set, &table->sets, list) {
3020 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3021 nft_active_genmask(set, genmask))
3024 return ERR_PTR(-ENOENT);
3027 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3028 const struct nlattr *nla, u8 genmask)
3030 struct nft_trans *trans;
3031 u32 id = ntohl(nla_get_be32(nla));
3033 list_for_each_entry(trans, &net->nft.commit_list, list) {
3034 if (trans->msg_type == NFT_MSG_NEWSET) {
3035 struct nft_set *set = nft_trans_set(trans);
3037 if (id == nft_trans_set_id(trans) &&
3038 nft_active_genmask(set, genmask))
3042 return ERR_PTR(-ENOENT);
3045 struct nft_set *nft_set_lookup_global(const struct net *net,
3046 const struct nft_table *table,
3047 const struct nlattr *nla_set_name,
3048 const struct nlattr *nla_set_id,
3051 struct nft_set *set;
3053 set = nft_set_lookup(table, nla_set_name, genmask);
3058 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3062 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3064 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3067 const struct nft_set *i;
3069 unsigned long *inuse;
3070 unsigned int n = 0, min = 0;
3072 p = strchr(name, '%');
3074 if (p[1] != 'd' || strchr(p + 2, '%'))
3077 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3081 list_for_each_entry(i, &ctx->table->sets, list) {
3084 if (!nft_is_active_next(ctx->net, set))
3086 if (!sscanf(i->name, name, &tmp))
3088 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3091 set_bit(tmp - min, inuse);
3094 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3095 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3096 min += BITS_PER_BYTE * PAGE_SIZE;
3097 memset(inuse, 0, PAGE_SIZE);
3100 free_page((unsigned long)inuse);
3103 set->name = kasprintf(GFP_KERNEL, name, min + n);
3107 list_for_each_entry(i, &ctx->table->sets, list) {
3108 if (!nft_is_active_next(ctx->net, i))
3110 if (!strcmp(set->name, i->name)) {
3118 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3120 u64 ms = be64_to_cpu(nla_get_be64(nla));
3121 u64 max = (u64)(~((u64)0));
3123 max = div_u64(max, NSEC_PER_MSEC);
3127 ms *= NSEC_PER_MSEC;
3128 *result = nsecs_to_jiffies64(ms);
3132 static __be64 nf_jiffies64_to_msecs(u64 input)
3134 u64 ms = jiffies64_to_nsecs(input);
3136 return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC));
3139 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3140 const struct nft_set *set, u16 event, u16 flags)
3142 struct nfgenmsg *nfmsg;
3143 struct nlmsghdr *nlh;
3144 struct nlattr *desc;
3145 u32 portid = ctx->portid;
3148 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3149 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3152 goto nla_put_failure;
3154 nfmsg = nlmsg_data(nlh);
3155 nfmsg->nfgen_family = ctx->family;
3156 nfmsg->version = NFNETLINK_V0;
3157 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3159 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3160 goto nla_put_failure;
3161 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3162 goto nla_put_failure;
3163 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3165 goto nla_put_failure;
3166 if (set->flags != 0)
3167 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3168 goto nla_put_failure;
3170 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3171 goto nla_put_failure;
3172 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3173 goto nla_put_failure;
3174 if (set->flags & NFT_SET_MAP) {
3175 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3176 goto nla_put_failure;
3177 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3178 goto nla_put_failure;
3180 if (set->flags & NFT_SET_OBJECT &&
3181 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3182 goto nla_put_failure;
3185 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3186 nf_jiffies64_to_msecs(set->timeout),
3188 goto nla_put_failure;
3190 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3191 goto nla_put_failure;
3193 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3194 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3195 goto nla_put_failure;
3198 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3199 goto nla_put_failure;
3201 desc = nla_nest_start(skb, NFTA_SET_DESC);
3203 goto nla_put_failure;
3205 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3206 goto nla_put_failure;
3207 nla_nest_end(skb, desc);
3209 nlmsg_end(skb, nlh);
3213 nlmsg_trim(skb, nlh);
3217 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3218 const struct nft_set *set, int event,
3221 struct sk_buff *skb;
3222 u32 portid = ctx->portid;
3226 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3229 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3233 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3239 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3243 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3246 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3248 const struct nft_set *set;
3249 unsigned int idx, s_idx = cb->args[0];
3250 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3251 struct net *net = sock_net(skb->sk);
3252 struct nft_ctx *ctx = cb->data, ctx_set;
3258 cb->seq = net->nft.base_seq;
3260 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3261 if (ctx->family != NFPROTO_UNSPEC &&
3262 ctx->family != table->family)
3265 if (ctx->table && ctx->table != table)
3269 if (cur_table != table)
3275 list_for_each_entry_rcu(set, &table->sets, list) {
3278 if (!nft_is_active(net, set))
3282 ctx_set.table = table;
3283 ctx_set.family = table->family;
3285 if (nf_tables_fill_set(skb, &ctx_set, set,
3289 cb->args[2] = (unsigned long) table;
3292 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3305 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3307 struct nft_ctx *ctx_dump = NULL;
3309 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3310 if (ctx_dump == NULL)
3313 cb->data = ctx_dump;
3317 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3323 /* called with rcu_read_lock held */
3324 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3325 struct sk_buff *skb, const struct nlmsghdr *nlh,
3326 const struct nlattr * const nla[],
3327 struct netlink_ext_ack *extack)
3329 u8 genmask = nft_genmask_cur(net);
3330 const struct nft_set *set;
3332 struct sk_buff *skb2;
3333 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3336 /* Verify existence before starting dump */
3337 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3342 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3343 struct netlink_dump_control c = {
3344 .start = nf_tables_dump_sets_start,
3345 .dump = nf_tables_dump_sets,
3346 .done = nf_tables_dump_sets_done,
3348 .module = THIS_MODULE,
3351 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3354 /* Only accept unspec with dump */
3355 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3356 return -EAFNOSUPPORT;
3357 if (!nla[NFTA_SET_TABLE])
3360 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3362 return PTR_ERR(set);
3364 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3368 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3372 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3379 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
3380 struct nft_set_desc *desc,
3381 const struct nlattr *nla)
3383 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3386 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
3387 nft_set_desc_policy, NULL);
3391 if (da[NFTA_SET_DESC_SIZE] != NULL)
3392 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3397 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3398 struct sk_buff *skb, const struct nlmsghdr *nlh,
3399 const struct nlattr * const nla[],
3400 struct netlink_ext_ack *extack)
3402 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3403 u8 genmask = nft_genmask_next(net);
3404 int family = nfmsg->nfgen_family;
3405 const struct nft_set_ops *ops;
3406 struct nft_table *table;
3407 struct nft_set *set;
3412 u32 ktype, dtype, flags, policy, gc_int, objtype;
3413 struct nft_set_desc desc;
3414 unsigned char *udata;
3418 if (nla[NFTA_SET_TABLE] == NULL ||
3419 nla[NFTA_SET_NAME] == NULL ||
3420 nla[NFTA_SET_KEY_LEN] == NULL ||
3421 nla[NFTA_SET_ID] == NULL)
3424 memset(&desc, 0, sizeof(desc));
3426 ktype = NFT_DATA_VALUE;
3427 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3428 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3429 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3433 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3434 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3438 if (nla[NFTA_SET_FLAGS] != NULL) {
3439 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3440 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3441 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3442 NFT_SET_MAP | NFT_SET_EVAL |
3445 /* Only one of these operations is supported */
3446 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3447 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
3452 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3453 if (!(flags & NFT_SET_MAP))
3456 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3457 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3458 dtype != NFT_DATA_VERDICT)
3461 if (dtype != NFT_DATA_VERDICT) {
3462 if (nla[NFTA_SET_DATA_LEN] == NULL)
3464 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3465 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3468 desc.dlen = sizeof(struct nft_verdict);
3469 } else if (flags & NFT_SET_MAP)
3472 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3473 if (!(flags & NFT_SET_OBJECT))
3476 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3477 if (objtype == NFT_OBJECT_UNSPEC ||
3478 objtype > NFT_OBJECT_MAX)
3480 } else if (flags & NFT_SET_OBJECT)
3483 objtype = NFT_OBJECT_UNSPEC;
3486 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3487 if (!(flags & NFT_SET_TIMEOUT))
3490 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3495 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3496 if (!(flags & NFT_SET_TIMEOUT))
3498 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3501 policy = NFT_SET_POL_PERFORMANCE;
3502 if (nla[NFTA_SET_POLICY] != NULL)
3503 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3505 if (nla[NFTA_SET_DESC] != NULL) {
3506 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3511 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
3512 if (IS_ERR(table)) {
3513 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3514 return PTR_ERR(table);
3517 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3519 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3521 if (PTR_ERR(set) != -ENOENT) {
3522 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3523 return PTR_ERR(set);
3526 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3527 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3530 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3536 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3539 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3541 return PTR_ERR(ops);
3544 if (nla[NFTA_SET_USERDATA])
3545 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3548 if (ops->privsize != NULL)
3549 size = ops->privsize(nla, &desc);
3551 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3557 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3563 err = nf_tables_set_alloc_name(&ctx, set, name);
3570 udata = set->data + size;
3571 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3574 INIT_LIST_HEAD(&set->bindings);
3576 write_pnet(&set->net, net);
3579 set->klen = desc.klen;
3581 set->objtype = objtype;
3582 set->dlen = desc.dlen;
3584 set->size = desc.size;
3585 set->policy = policy;
3588 set->timeout = timeout;
3589 set->gc_int = gc_int;
3590 set->handle = nf_tables_alloc_handle(table);
3592 err = ops->init(set, &desc, nla);
3596 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3600 list_add_tail_rcu(&set->list, &table->sets);
3611 module_put(to_set_type(ops)->owner);
3615 static void nft_set_destroy(struct nft_set *set)
3617 set->ops->destroy(set);
3618 module_put(to_set_type(set->ops)->owner);
3623 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3624 struct sk_buff *skb, const struct nlmsghdr *nlh,
3625 const struct nlattr * const nla[],
3626 struct netlink_ext_ack *extack)
3628 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3629 u8 genmask = nft_genmask_next(net);
3630 const struct nlattr *attr;
3631 struct nft_set *set;
3635 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3636 return -EAFNOSUPPORT;
3637 if (nla[NFTA_SET_TABLE] == NULL)
3640 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3645 if (nla[NFTA_SET_HANDLE]) {
3646 attr = nla[NFTA_SET_HANDLE];
3647 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3649 attr = nla[NFTA_SET_NAME];
3650 set = nft_set_lookup(ctx.table, attr, genmask);
3654 NL_SET_BAD_ATTR(extack, attr);
3655 return PTR_ERR(set);
3657 if (!list_empty(&set->bindings) ||
3658 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3659 NL_SET_BAD_ATTR(extack, attr);
3663 return nft_delset(&ctx, set);
3666 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3667 struct nft_set *set,
3668 const struct nft_set_iter *iter,
3669 struct nft_set_elem *elem)
3671 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3672 enum nft_registers dreg;
3674 dreg = nft_type_to_reg(set->dtype);
3675 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3676 set->dtype == NFT_DATA_VERDICT ?
3677 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3681 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3682 struct nft_set_binding *binding)
3684 struct nft_set_binding *i;
3685 struct nft_set_iter iter;
3687 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3690 if (binding->flags & NFT_SET_MAP) {
3691 /* If the set is already bound to the same chain all
3692 * jumps are already validated for that chain.
3694 list_for_each_entry(i, &set->bindings, list) {
3695 if (i->flags & NFT_SET_MAP &&
3696 i->chain == binding->chain)
3700 iter.genmask = nft_genmask_next(ctx->net);
3704 iter.fn = nf_tables_bind_check_setelem;
3706 set->ops->walk(ctx, set, &iter);
3711 binding->chain = ctx->chain;
3712 list_add_tail_rcu(&binding->list, &set->bindings);
3715 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3717 void nf_tables_rebind_set(const struct nft_ctx *ctx, struct nft_set *set,
3718 struct nft_set_binding *binding)
3720 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
3721 nft_is_active(ctx->net, set))
3722 list_add_tail_rcu(&set->list, &ctx->table->sets);
3724 list_add_tail_rcu(&binding->list, &set->bindings);
3726 EXPORT_SYMBOL_GPL(nf_tables_rebind_set);
3728 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3729 struct nft_set_binding *binding)
3731 list_del_rcu(&binding->list);
3733 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
3734 nft_is_active(ctx->net, set))
3735 list_del_rcu(&set->list);
3737 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3739 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
3741 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
3742 nft_is_active(ctx->net, set)) {
3743 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3744 nft_set_destroy(set);
3747 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
3749 const struct nft_set_ext_type nft_set_ext_types[] = {
3750 [NFT_SET_EXT_KEY] = {
3751 .align = __alignof__(u32),
3753 [NFT_SET_EXT_DATA] = {
3754 .align = __alignof__(u32),
3756 [NFT_SET_EXT_EXPR] = {
3757 .align = __alignof__(struct nft_expr),
3759 [NFT_SET_EXT_OBJREF] = {
3760 .len = sizeof(struct nft_object *),
3761 .align = __alignof__(struct nft_object *),
3763 [NFT_SET_EXT_FLAGS] = {
3765 .align = __alignof__(u8),
3767 [NFT_SET_EXT_TIMEOUT] = {
3769 .align = __alignof__(u64),
3771 [NFT_SET_EXT_EXPIRATION] = {
3773 .align = __alignof__(u64),
3775 [NFT_SET_EXT_USERDATA] = {
3776 .len = sizeof(struct nft_userdata),
3777 .align = __alignof__(struct nft_userdata),
3780 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3786 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3787 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3788 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3789 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3790 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3791 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3792 .len = NFT_USERDATA_MAXLEN },
3793 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3794 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
3797 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3798 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3799 .len = NFT_TABLE_MAXNAMELEN - 1 },
3800 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3801 .len = NFT_SET_MAXNAMELEN - 1 },
3802 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3803 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3806 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3807 const struct sk_buff *skb,
3808 const struct nlmsghdr *nlh,
3809 const struct nlattr * const nla[],
3810 struct netlink_ext_ack *extack,
3813 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3814 int family = nfmsg->nfgen_family;
3815 struct nft_table *table;
3817 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3819 if (IS_ERR(table)) {
3820 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
3821 return PTR_ERR(table);
3824 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3828 static int nf_tables_fill_setelem(struct sk_buff *skb,
3829 const struct nft_set *set,
3830 const struct nft_set_elem *elem)
3832 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3833 unsigned char *b = skb_tail_pointer(skb);
3834 struct nlattr *nest;
3836 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3838 goto nla_put_failure;
3840 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3841 NFT_DATA_VALUE, set->klen) < 0)
3842 goto nla_put_failure;
3844 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3845 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3846 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3848 goto nla_put_failure;
3850 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3851 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3852 goto nla_put_failure;
3854 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3855 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3856 (*nft_set_ext_obj(ext))->name) < 0)
3857 goto nla_put_failure;
3859 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3860 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3861 htonl(*nft_set_ext_flags(ext))))
3862 goto nla_put_failure;
3864 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3865 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3866 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
3868 goto nla_put_failure;
3870 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3871 u64 expires, now = get_jiffies_64();
3873 expires = *nft_set_ext_expiration(ext);
3874 if (time_before64(now, expires))
3879 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3880 nf_jiffies64_to_msecs(expires),
3882 goto nla_put_failure;
3885 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3886 struct nft_userdata *udata;
3888 udata = nft_set_ext_userdata(ext);
3889 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3890 udata->len + 1, udata->data))
3891 goto nla_put_failure;
3894 nla_nest_end(skb, nest);
3902 struct nft_set_dump_args {
3903 const struct netlink_callback *cb;
3904 struct nft_set_iter iter;
3905 struct sk_buff *skb;
3908 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3909 struct nft_set *set,
3910 const struct nft_set_iter *iter,
3911 struct nft_set_elem *elem)
3913 struct nft_set_dump_args *args;
3915 args = container_of(iter, struct nft_set_dump_args, iter);
3916 return nf_tables_fill_setelem(args->skb, set, elem);
3919 struct nft_set_dump_ctx {
3920 const struct nft_set *set;
3924 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3926 struct nft_set_dump_ctx *dump_ctx = cb->data;
3927 struct net *net = sock_net(skb->sk);
3928 struct nft_table *table;
3929 struct nft_set *set;
3930 struct nft_set_dump_args args;
3931 bool set_found = false;
3932 struct nfgenmsg *nfmsg;
3933 struct nlmsghdr *nlh;
3934 struct nlattr *nest;
3939 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3940 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
3941 dump_ctx->ctx.family != table->family)
3944 if (table != dump_ctx->ctx.table)
3947 list_for_each_entry_rcu(set, &table->sets, list) {
3948 if (set == dump_ctx->set) {
3961 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
3962 portid = NETLINK_CB(cb->skb).portid;
3963 seq = cb->nlh->nlmsg_seq;
3965 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3968 goto nla_put_failure;
3970 nfmsg = nlmsg_data(nlh);
3971 nfmsg->nfgen_family = table->family;
3972 nfmsg->version = NFNETLINK_V0;
3973 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3975 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
3976 goto nla_put_failure;
3977 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3978 goto nla_put_failure;
3980 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3982 goto nla_put_failure;
3986 args.iter.genmask = nft_genmask_cur(net);
3987 args.iter.skip = cb->args[0];
3988 args.iter.count = 0;
3990 args.iter.fn = nf_tables_dump_setelem;
3991 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3994 nla_nest_end(skb, nest);
3995 nlmsg_end(skb, nlh);
3997 if (args.iter.err && args.iter.err != -EMSGSIZE)
3998 return args.iter.err;
3999 if (args.iter.count == cb->args[0])
4002 cb->args[0] = args.iter.count;
4010 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4012 struct nft_set_dump_ctx *dump_ctx = cb->data;
4014 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4016 return cb->data ? 0 : -ENOMEM;
4019 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4025 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4026 const struct nft_ctx *ctx, u32 seq,
4027 u32 portid, int event, u16 flags,
4028 const struct nft_set *set,
4029 const struct nft_set_elem *elem)
4031 struct nfgenmsg *nfmsg;
4032 struct nlmsghdr *nlh;
4033 struct nlattr *nest;
4036 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4037 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4040 goto nla_put_failure;
4042 nfmsg = nlmsg_data(nlh);
4043 nfmsg->nfgen_family = ctx->family;
4044 nfmsg->version = NFNETLINK_V0;
4045 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4047 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4048 goto nla_put_failure;
4049 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4050 goto nla_put_failure;
4052 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4054 goto nla_put_failure;
4056 err = nf_tables_fill_setelem(skb, set, elem);
4058 goto nla_put_failure;
4060 nla_nest_end(skb, nest);
4062 nlmsg_end(skb, nlh);
4066 nlmsg_trim(skb, nlh);
4070 static int nft_setelem_parse_flags(const struct nft_set *set,
4071 const struct nlattr *attr, u32 *flags)
4076 *flags = ntohl(nla_get_be32(attr));
4077 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4079 if (!(set->flags & NFT_SET_INTERVAL) &&
4080 *flags & NFT_SET_ELEM_INTERVAL_END)
4086 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4087 const struct nlattr *attr)
4089 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4090 struct nft_data_desc desc;
4091 struct nft_set_elem elem;
4092 struct sk_buff *skb;
4097 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4098 nft_set_elem_policy, NULL);
4102 if (!nla[NFTA_SET_ELEM_KEY])
4105 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4109 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4110 nla[NFTA_SET_ELEM_KEY]);
4115 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4118 priv = set->ops->get(ctx->net, set, &elem, flags);
4120 return PTR_ERR(priv);
4125 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4129 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4130 NFT_MSG_NEWSETELEM, 0, set, &elem);
4134 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4135 /* This avoids a loop in nfnetlink. */
4143 /* this avoids a loop in nfnetlink. */
4144 return err == -EAGAIN ? -ENOBUFS : err;
4147 /* called with rcu_read_lock held */
4148 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4149 struct sk_buff *skb, const struct nlmsghdr *nlh,
4150 const struct nlattr * const nla[],
4151 struct netlink_ext_ack *extack)
4153 u8 genmask = nft_genmask_cur(net);
4154 struct nft_set *set;
4155 struct nlattr *attr;
4159 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4164 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4166 return PTR_ERR(set);
4168 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4169 struct netlink_dump_control c = {
4170 .start = nf_tables_dump_set_start,
4171 .dump = nf_tables_dump_set,
4172 .done = nf_tables_dump_set_done,
4173 .module = THIS_MODULE,
4175 struct nft_set_dump_ctx dump_ctx = {
4181 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4184 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4187 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4188 err = nft_get_set_elem(&ctx, set, attr);
4196 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4197 const struct nft_set *set,
4198 const struct nft_set_elem *elem,
4199 int event, u16 flags)
4201 struct net *net = ctx->net;
4202 u32 portid = ctx->portid;
4203 struct sk_buff *skb;
4206 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4209 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4213 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4220 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4224 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4227 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4229 struct nft_set *set)
4231 struct nft_trans *trans;
4233 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4237 nft_trans_elem_set(trans) = set;
4241 void *nft_set_elem_init(const struct nft_set *set,
4242 const struct nft_set_ext_tmpl *tmpl,
4243 const u32 *key, const u32 *data,
4244 u64 timeout, gfp_t gfp)
4246 struct nft_set_ext *ext;
4249 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4253 ext = nft_set_elem_ext(set, elem);
4254 nft_set_ext_init(ext, tmpl);
4256 memcpy(nft_set_ext_key(ext), key, set->klen);
4257 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4258 memcpy(nft_set_ext_data(ext), data, set->dlen);
4259 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
4260 *nft_set_ext_expiration(ext) =
4261 get_jiffies_64() + timeout;
4262 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4263 *nft_set_ext_timeout(ext) = timeout;
4268 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4271 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4272 struct nft_ctx ctx = {
4273 .net = read_pnet(&set->net),
4274 .family = set->table->family,
4277 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4278 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4279 nft_data_release(nft_set_ext_data(ext), set->dtype);
4280 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4281 struct nft_expr *expr = nft_set_ext_expr(ext);
4283 if (expr->ops->destroy_clone) {
4284 expr->ops->destroy_clone(&ctx, expr);
4285 module_put(expr->ops->type->owner);
4287 nf_tables_expr_destroy(&ctx, expr);
4290 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4291 (*nft_set_ext_obj(ext))->use--;
4294 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4296 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4297 * the refcounting from the preparation phase.
4299 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4300 const struct nft_set *set, void *elem)
4302 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4304 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4305 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4309 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4310 const struct nlattr *attr, u32 nlmsg_flags)
4312 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4313 u8 genmask = nft_genmask_next(ctx->net);
4314 struct nft_data_desc d1, d2;
4315 struct nft_set_ext_tmpl tmpl;
4316 struct nft_set_ext *ext, *ext2;
4317 struct nft_set_elem elem;
4318 struct nft_set_binding *binding;
4319 struct nft_object *obj = NULL;
4320 struct nft_userdata *udata;
4321 struct nft_data data;
4322 enum nft_registers dreg;
4323 struct nft_trans *trans;
4329 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4330 nft_set_elem_policy, NULL);
4334 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4337 nft_set_ext_prepare(&tmpl);
4339 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4343 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4345 if (set->flags & NFT_SET_MAP) {
4346 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4347 !(flags & NFT_SET_ELEM_INTERVAL_END))
4349 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
4350 flags & NFT_SET_ELEM_INTERVAL_END)
4353 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4358 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4359 if (!(set->flags & NFT_SET_TIMEOUT))
4361 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4365 } else if (set->flags & NFT_SET_TIMEOUT) {
4366 timeout = set->timeout;
4369 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
4370 nla[NFTA_SET_ELEM_KEY]);
4374 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4377 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
4379 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4380 if (timeout != set->timeout)
4381 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4384 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4385 if (!(set->flags & NFT_SET_OBJECT)) {
4389 obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
4390 set->objtype, genmask);
4395 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4398 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4399 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4400 nla[NFTA_SET_ELEM_DATA]);
4405 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4408 dreg = nft_type_to_reg(set->dtype);
4409 list_for_each_entry(binding, &set->bindings, list) {
4410 struct nft_ctx bind_ctx = {
4412 .family = ctx->family,
4413 .table = ctx->table,
4414 .chain = (struct nft_chain *)binding->chain,
4417 if (!(binding->flags & NFT_SET_MAP))
4420 err = nft_validate_register_store(&bind_ctx, dreg,
4426 if (d2.type == NFT_DATA_VERDICT &&
4427 (data.verdict.code == NFT_GOTO ||
4428 data.verdict.code == NFT_JUMP))
4429 nft_validate_state_update(ctx->net,
4433 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4436 /* The full maximum length of userdata can exceed the maximum
4437 * offset value (U8_MAX) for following extensions, therefor it
4438 * must be the last extension added.
4441 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4442 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4444 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4449 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4450 timeout, GFP_KERNEL);
4451 if (elem.priv == NULL)
4454 ext = nft_set_elem_ext(set, elem.priv);
4456 *nft_set_ext_flags(ext) = flags;
4458 udata = nft_set_ext_userdata(ext);
4459 udata->len = ulen - 1;
4460 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4463 *nft_set_ext_obj(ext) = obj;
4467 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4471 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4472 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4474 if (err == -EEXIST) {
4475 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4476 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4477 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4478 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4482 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4483 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4484 memcmp(nft_set_ext_data(ext),
4485 nft_set_ext_data(ext2), set->dlen) != 0) ||
4486 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4487 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4488 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4490 else if (!(nlmsg_flags & NLM_F_EXCL))
4497 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4502 nft_trans_elem(trans) = elem;
4503 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4507 set->ops->remove(ctx->net, set, &elem);
4513 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4514 nft_data_release(&data, d2.type);
4516 nft_data_release(&elem.key.val, d1.type);
4521 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4522 struct sk_buff *skb, const struct nlmsghdr *nlh,
4523 const struct nlattr * const nla[],
4524 struct netlink_ext_ack *extack)
4526 u8 genmask = nft_genmask_next(net);
4527 const struct nlattr *attr;
4528 struct nft_set *set;
4532 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4535 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4540 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4541 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4543 return PTR_ERR(set);
4545 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4548 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4549 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4554 if (net->nft.validate_state == NFT_VALIDATE_DO)
4555 return nft_table_validate(net, ctx.table);
4561 * nft_data_hold - hold a nft_data item
4563 * @data: struct nft_data to release
4564 * @type: type of data
4566 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4567 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4568 * NFT_GOTO verdicts. This function must be called on active data objects
4569 * from the second phase of the commit protocol.
4571 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4573 if (type == NFT_DATA_VERDICT) {
4574 switch (data->verdict.code) {
4577 data->verdict.chain->use++;
4583 static void nft_set_elem_activate(const struct net *net,
4584 const struct nft_set *set,
4585 struct nft_set_elem *elem)
4587 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4589 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4590 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4591 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4592 (*nft_set_ext_obj(ext))->use++;
4595 static void nft_set_elem_deactivate(const struct net *net,
4596 const struct nft_set *set,
4597 struct nft_set_elem *elem)
4599 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4601 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4602 nft_data_release(nft_set_ext_data(ext), set->dtype);
4603 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4604 (*nft_set_ext_obj(ext))->use--;
4607 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4608 const struct nlattr *attr)
4610 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4611 struct nft_set_ext_tmpl tmpl;
4612 struct nft_data_desc desc;
4613 struct nft_set_elem elem;
4614 struct nft_set_ext *ext;
4615 struct nft_trans *trans;
4620 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4621 nft_set_elem_policy, NULL);
4626 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4629 nft_set_ext_prepare(&tmpl);
4631 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4635 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4637 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4638 nla[NFTA_SET_ELEM_KEY]);
4643 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4646 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4649 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4651 if (elem.priv == NULL)
4654 ext = nft_set_elem_ext(set, elem.priv);
4656 *nft_set_ext_flags(ext) = flags;
4658 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4659 if (trans == NULL) {
4664 priv = set->ops->deactivate(ctx->net, set, &elem);
4672 nft_set_elem_deactivate(ctx->net, set, &elem);
4674 nft_trans_elem(trans) = elem;
4675 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4683 nft_data_release(&elem.key.val, desc.type);
4688 static int nft_flush_set(const struct nft_ctx *ctx,
4689 struct nft_set *set,
4690 const struct nft_set_iter *iter,
4691 struct nft_set_elem *elem)
4693 struct nft_trans *trans;
4696 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4697 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4701 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4707 nft_set_elem_deactivate(ctx->net, set, elem);
4708 nft_trans_elem_set(trans) = set;
4709 nft_trans_elem(trans) = *elem;
4710 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4718 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4719 struct sk_buff *skb, const struct nlmsghdr *nlh,
4720 const struct nlattr * const nla[],
4721 struct netlink_ext_ack *extack)
4723 u8 genmask = nft_genmask_next(net);
4724 const struct nlattr *attr;
4725 struct nft_set *set;
4729 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4734 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4736 return PTR_ERR(set);
4737 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4740 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4741 struct nft_set_iter iter = {
4743 .fn = nft_flush_set,
4745 set->ops->walk(&ctx, set, &iter);
4750 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4751 err = nft_del_setelem(&ctx, set, attr);
4760 void nft_set_gc_batch_release(struct rcu_head *rcu)
4762 struct nft_set_gc_batch *gcb;
4765 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4766 for (i = 0; i < gcb->head.cnt; i++)
4767 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4770 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4772 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4775 struct nft_set_gc_batch *gcb;
4777 gcb = kzalloc(sizeof(*gcb), gfp);
4780 gcb->head.set = set;
4783 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4790 * nft_register_obj- register nf_tables stateful object type
4793 * Registers the object type for use with nf_tables. Returns zero on
4794 * success or a negative errno code otherwise.
4796 int nft_register_obj(struct nft_object_type *obj_type)
4798 if (obj_type->type == NFT_OBJECT_UNSPEC)
4801 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4802 list_add_rcu(&obj_type->list, &nf_tables_objects);
4803 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4806 EXPORT_SYMBOL_GPL(nft_register_obj);
4809 * nft_unregister_obj - unregister nf_tables object type
4812 * Unregisters the object type for use with nf_tables.
4814 void nft_unregister_obj(struct nft_object_type *obj_type)
4816 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4817 list_del_rcu(&obj_type->list);
4818 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4820 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4822 struct nft_object *nft_obj_lookup(const struct nft_table *table,
4823 const struct nlattr *nla, u32 objtype,
4826 struct nft_object *obj;
4828 list_for_each_entry_rcu(obj, &table->objects, list) {
4829 if (!nla_strcmp(nla, obj->name) &&
4830 objtype == obj->ops->type->type &&
4831 nft_active_genmask(obj, genmask))
4834 return ERR_PTR(-ENOENT);
4836 EXPORT_SYMBOL_GPL(nft_obj_lookup);
4838 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
4839 const struct nlattr *nla,
4840 u32 objtype, u8 genmask)
4842 struct nft_object *obj;
4844 list_for_each_entry(obj, &table->objects, list) {
4845 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
4846 objtype == obj->ops->type->type &&
4847 nft_active_genmask(obj, genmask))
4850 return ERR_PTR(-ENOENT);
4853 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4854 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4855 .len = NFT_TABLE_MAXNAMELEN - 1 },
4856 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4857 .len = NFT_OBJ_MAXNAMELEN - 1 },
4858 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4859 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4860 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
4863 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4864 const struct nft_object_type *type,
4865 const struct nlattr *attr)
4868 const struct nft_object_ops *ops;
4869 struct nft_object *obj;
4872 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
4877 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4882 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4885 if (type->select_ops) {
4886 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4896 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
4900 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
4913 return ERR_PTR(err);
4916 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4917 struct nft_object *obj, bool reset)
4919 struct nlattr *nest;
4921 nest = nla_nest_start(skb, attr);
4923 goto nla_put_failure;
4924 if (obj->ops->dump(skb, obj, reset) < 0)
4925 goto nla_put_failure;
4926 nla_nest_end(skb, nest);
4933 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4935 const struct nft_object_type *type;
4937 list_for_each_entry(type, &nf_tables_objects, list) {
4938 if (objtype == type->type)
4944 static const struct nft_object_type *
4945 nft_obj_type_get(struct net *net, u32 objtype)
4947 const struct nft_object_type *type;
4949 type = __nft_obj_type_get(objtype);
4950 if (type != NULL && try_module_get(type->owner))
4953 lockdep_nfnl_nft_mutex_not_held();
4954 #ifdef CONFIG_MODULES
4956 nft_request_module(net, "nft-obj-%u", objtype);
4957 if (__nft_obj_type_get(objtype))
4958 return ERR_PTR(-EAGAIN);
4961 return ERR_PTR(-ENOENT);
4964 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4965 struct sk_buff *skb, const struct nlmsghdr *nlh,
4966 const struct nlattr * const nla[],
4967 struct netlink_ext_ack *extack)
4969 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4970 const struct nft_object_type *type;
4971 u8 genmask = nft_genmask_next(net);
4972 int family = nfmsg->nfgen_family;
4973 struct nft_table *table;
4974 struct nft_object *obj;
4979 if (!nla[NFTA_OBJ_TYPE] ||
4980 !nla[NFTA_OBJ_NAME] ||
4981 !nla[NFTA_OBJ_DATA])
4984 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
4985 if (IS_ERR(table)) {
4986 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
4987 return PTR_ERR(table);
4990 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4991 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4994 if (err != -ENOENT) {
4995 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
4999 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5000 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5006 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5008 type = nft_obj_type_get(net, objtype);
5010 return PTR_ERR(type);
5012 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5018 obj->handle = nf_tables_alloc_handle(table);
5020 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5026 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5030 list_add_tail_rcu(&obj->list, &table->objects);
5036 if (obj->ops->destroy)
5037 obj->ops->destroy(&ctx, obj);
5040 module_put(type->owner);
5044 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5045 u32 portid, u32 seq, int event, u32 flags,
5046 int family, const struct nft_table *table,
5047 struct nft_object *obj, bool reset)
5049 struct nfgenmsg *nfmsg;
5050 struct nlmsghdr *nlh;
5052 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5053 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5055 goto nla_put_failure;
5057 nfmsg = nlmsg_data(nlh);
5058 nfmsg->nfgen_family = family;
5059 nfmsg->version = NFNETLINK_V0;
5060 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5062 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5063 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
5064 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5065 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5066 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5067 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5069 goto nla_put_failure;
5071 nlmsg_end(skb, nlh);
5075 nlmsg_trim(skb, nlh);
5079 struct nft_obj_filter {
5084 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5086 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5087 const struct nft_table *table;
5088 unsigned int idx = 0, s_idx = cb->args[0];
5089 struct nft_obj_filter *filter = cb->data;
5090 struct net *net = sock_net(skb->sk);
5091 int family = nfmsg->nfgen_family;
5092 struct nft_object *obj;
5095 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5099 cb->seq = net->nft.base_seq;
5101 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5102 if (family != NFPROTO_UNSPEC && family != table->family)
5105 list_for_each_entry_rcu(obj, &table->objects, list) {
5106 if (!nft_is_active(net, obj))
5111 memset(&cb->args[1], 0,
5112 sizeof(cb->args) - sizeof(cb->args[0]));
5113 if (filter && filter->table &&
5114 strcmp(filter->table, table->name))
5117 filter->type != NFT_OBJECT_UNSPEC &&
5118 obj->ops->type->type != filter->type)
5121 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5124 NLM_F_MULTI | NLM_F_APPEND,
5125 table->family, table,
5129 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5141 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
5143 const struct nlattr * const *nla = cb->data;
5144 struct nft_obj_filter *filter = NULL;
5146 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5147 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5151 if (nla[NFTA_OBJ_TABLE]) {
5152 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5153 if (!filter->table) {
5159 if (nla[NFTA_OBJ_TYPE])
5160 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5167 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
5169 struct nft_obj_filter *filter = cb->data;
5172 kfree(filter->table);
5179 /* called with rcu_read_lock held */
5180 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5181 struct sk_buff *skb, const struct nlmsghdr *nlh,
5182 const struct nlattr * const nla[],
5183 struct netlink_ext_ack *extack)
5185 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5186 u8 genmask = nft_genmask_cur(net);
5187 int family = nfmsg->nfgen_family;
5188 const struct nft_table *table;
5189 struct nft_object *obj;
5190 struct sk_buff *skb2;
5195 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5196 struct netlink_dump_control c = {
5197 .start = nf_tables_dump_obj_start,
5198 .dump = nf_tables_dump_obj,
5199 .done = nf_tables_dump_obj_done,
5200 .module = THIS_MODULE,
5201 .data = (void *)nla,
5204 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5207 if (!nla[NFTA_OBJ_NAME] ||
5208 !nla[NFTA_OBJ_TYPE])
5211 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5212 if (IS_ERR(table)) {
5213 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5214 return PTR_ERR(table);
5217 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5218 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
5220 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5221 return PTR_ERR(obj);
5224 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5228 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5231 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5232 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5233 family, table, obj, reset);
5237 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5243 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5245 if (obj->ops->destroy)
5246 obj->ops->destroy(ctx, obj);
5248 module_put(obj->ops->type->owner);
5253 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5254 struct sk_buff *skb, const struct nlmsghdr *nlh,
5255 const struct nlattr * const nla[],
5256 struct netlink_ext_ack *extack)
5258 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5259 u8 genmask = nft_genmask_next(net);
5260 int family = nfmsg->nfgen_family;
5261 const struct nlattr *attr;
5262 struct nft_table *table;
5263 struct nft_object *obj;
5267 if (!nla[NFTA_OBJ_TYPE] ||
5268 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5271 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5272 if (IS_ERR(table)) {
5273 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5274 return PTR_ERR(table);
5277 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5278 if (nla[NFTA_OBJ_HANDLE]) {
5279 attr = nla[NFTA_OBJ_HANDLE];
5280 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5282 attr = nla[NFTA_OBJ_NAME];
5283 obj = nft_obj_lookup(table, attr, objtype, genmask);
5287 NL_SET_BAD_ATTR(extack, attr);
5288 return PTR_ERR(obj);
5291 NL_SET_BAD_ATTR(extack, attr);
5295 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5297 return nft_delobj(&ctx, obj);
5300 void nft_obj_notify(struct net *net, struct nft_table *table,
5301 struct nft_object *obj, u32 portid, u32 seq, int event,
5302 int family, int report, gfp_t gfp)
5304 struct sk_buff *skb;
5308 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5311 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5315 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5322 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5325 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5327 EXPORT_SYMBOL_GPL(nft_obj_notify);
5329 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5330 struct nft_object *obj, int event)
5332 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
5333 ctx->family, ctx->report, GFP_KERNEL);
5339 void nft_register_flowtable_type(struct nf_flowtable_type *type)
5341 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5342 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5343 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5345 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5347 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5349 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5350 list_del_rcu(&type->list);
5351 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5353 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5355 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5356 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5357 .len = NFT_NAME_MAXLEN - 1 },
5358 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5359 .len = NFT_NAME_MAXLEN - 1 },
5360 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
5361 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
5364 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5365 const struct nlattr *nla, u8 genmask)
5367 struct nft_flowtable *flowtable;
5369 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5370 if (!nla_strcmp(nla, flowtable->name) &&
5371 nft_active_genmask(flowtable, genmask))
5374 return ERR_PTR(-ENOENT);
5376 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
5378 static struct nft_flowtable *
5379 nft_flowtable_lookup_byhandle(const struct nft_table *table,
5380 const struct nlattr *nla, u8 genmask)
5382 struct nft_flowtable *flowtable;
5384 list_for_each_entry(flowtable, &table->flowtables, list) {
5385 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5386 nft_active_genmask(flowtable, genmask))
5389 return ERR_PTR(-ENOENT);
5392 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5393 const struct nlattr *attr,
5394 struct net_device *dev_array[], int *len)
5396 const struct nlattr *tmp;
5397 struct net_device *dev;
5398 char ifname[IFNAMSIZ];
5399 int rem, n = 0, err;
5401 nla_for_each_nested(tmp, attr, rem) {
5402 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5407 nla_strlcpy(ifname, tmp, IFNAMSIZ);
5408 dev = __dev_get_by_name(ctx->net, ifname);
5414 dev_array[n++] = dev;
5415 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5429 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5430 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5431 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5432 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5435 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5436 const struct nlattr *attr,
5437 struct nft_flowtable *flowtable)
5439 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5440 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5441 struct nf_hook_ops *ops;
5442 int hooknum, priority;
5445 err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5446 nft_flowtable_hook_policy, NULL);
5450 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5451 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5452 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5455 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5456 if (hooknum != NF_NETDEV_INGRESS)
5459 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5461 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5466 ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
5470 flowtable->hooknum = hooknum;
5471 flowtable->priority = priority;
5472 flowtable->ops = ops;
5473 flowtable->ops_len = n;
5475 for (i = 0; i < n; i++) {
5476 flowtable->ops[i].pf = NFPROTO_NETDEV;
5477 flowtable->ops[i].hooknum = hooknum;
5478 flowtable->ops[i].priority = priority;
5479 flowtable->ops[i].priv = &flowtable->data;
5480 flowtable->ops[i].hook = flowtable->data.type->hook;
5481 flowtable->ops[i].dev = dev_array[i];
5487 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5489 const struct nf_flowtable_type *type;
5491 list_for_each_entry(type, &nf_tables_flowtables, list) {
5492 if (family == type->family)
5498 static const struct nf_flowtable_type *
5499 nft_flowtable_type_get(struct net *net, u8 family)
5501 const struct nf_flowtable_type *type;
5503 type = __nft_flowtable_type_get(family);
5504 if (type != NULL && try_module_get(type->owner))
5507 lockdep_nfnl_nft_mutex_not_held();
5508 #ifdef CONFIG_MODULES
5510 nft_request_module(net, "nf-flowtable-%u", family);
5511 if (__nft_flowtable_type_get(family))
5512 return ERR_PTR(-EAGAIN);
5515 return ERR_PTR(-ENOENT);
5518 static void nft_unregister_flowtable_net_hooks(struct net *net,
5519 struct nft_flowtable *flowtable)
5523 for (i = 0; i < flowtable->ops_len; i++) {
5524 if (!flowtable->ops[i].dev)
5527 nf_unregister_net_hook(net, &flowtable->ops[i]);
5531 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5532 struct sk_buff *skb,
5533 const struct nlmsghdr *nlh,
5534 const struct nlattr * const nla[],
5535 struct netlink_ext_ack *extack)
5537 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5538 const struct nf_flowtable_type *type;
5539 struct nft_flowtable *flowtable, *ft;
5540 u8 genmask = nft_genmask_next(net);
5541 int family = nfmsg->nfgen_family;
5542 struct nft_table *table;
5546 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5547 !nla[NFTA_FLOWTABLE_NAME] ||
5548 !nla[NFTA_FLOWTABLE_HOOK])
5551 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5553 if (IS_ERR(table)) {
5554 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5555 return PTR_ERR(table);
5558 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5560 if (IS_ERR(flowtable)) {
5561 err = PTR_ERR(flowtable);
5562 if (err != -ENOENT) {
5563 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5567 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5568 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5575 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5577 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5581 flowtable->table = table;
5582 flowtable->handle = nf_tables_alloc_handle(table);
5584 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5585 if (!flowtable->name) {
5590 type = nft_flowtable_type_get(net, family);
5592 err = PTR_ERR(type);
5596 flowtable->data.type = type;
5597 err = type->init(&flowtable->data);
5601 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5606 for (i = 0; i < flowtable->ops_len; i++) {
5607 if (!flowtable->ops[i].dev)
5610 list_for_each_entry(ft, &table->flowtables, list) {
5611 for (k = 0; k < ft->ops_len; k++) {
5612 if (!ft->ops[k].dev)
5615 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5616 flowtable->ops[i].pf == ft->ops[k].pf) {
5623 err = nf_register_net_hook(net, &flowtable->ops[i]);
5628 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5632 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5637 i = flowtable->ops_len;
5639 for (k = i - 1; k >= 0; k--)
5640 nf_unregister_net_hook(net, &flowtable->ops[k]);
5642 kfree(flowtable->ops);
5644 flowtable->data.type->free(&flowtable->data);
5646 module_put(type->owner);
5648 kfree(flowtable->name);
5654 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5655 struct sk_buff *skb,
5656 const struct nlmsghdr *nlh,
5657 const struct nlattr * const nla[],
5658 struct netlink_ext_ack *extack)
5660 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5661 u8 genmask = nft_genmask_next(net);
5662 int family = nfmsg->nfgen_family;
5663 struct nft_flowtable *flowtable;
5664 const struct nlattr *attr;
5665 struct nft_table *table;
5668 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5669 (!nla[NFTA_FLOWTABLE_NAME] &&
5670 !nla[NFTA_FLOWTABLE_HANDLE]))
5673 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5675 if (IS_ERR(table)) {
5676 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5677 return PTR_ERR(table);
5680 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5681 attr = nla[NFTA_FLOWTABLE_HANDLE];
5682 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5684 attr = nla[NFTA_FLOWTABLE_NAME];
5685 flowtable = nft_flowtable_lookup(table, attr, genmask);
5688 if (IS_ERR(flowtable)) {
5689 NL_SET_BAD_ATTR(extack, attr);
5690 return PTR_ERR(flowtable);
5692 if (flowtable->use > 0) {
5693 NL_SET_BAD_ATTR(extack, attr);
5697 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5699 return nft_delflowtable(&ctx, flowtable);
5702 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5703 u32 portid, u32 seq, int event,
5704 u32 flags, int family,
5705 struct nft_flowtable *flowtable)
5707 struct nlattr *nest, *nest_devs;
5708 struct nfgenmsg *nfmsg;
5709 struct nlmsghdr *nlh;
5712 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5713 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5715 goto nla_put_failure;
5717 nfmsg = nlmsg_data(nlh);
5718 nfmsg->nfgen_family = family;
5719 nfmsg->version = NFNETLINK_V0;
5720 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5722 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5723 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5724 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5725 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5726 NFTA_FLOWTABLE_PAD))
5727 goto nla_put_failure;
5729 nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);
5730 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5731 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5732 goto nla_put_failure;
5734 nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5736 goto nla_put_failure;
5738 for (i = 0; i < flowtable->ops_len; i++) {
5739 const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev);
5742 nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
5743 goto nla_put_failure;
5745 nla_nest_end(skb, nest_devs);
5746 nla_nest_end(skb, nest);
5748 nlmsg_end(skb, nlh);
5752 nlmsg_trim(skb, nlh);
5756 struct nft_flowtable_filter {
5760 static int nf_tables_dump_flowtable(struct sk_buff *skb,
5761 struct netlink_callback *cb)
5763 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5764 struct nft_flowtable_filter *filter = cb->data;
5765 unsigned int idx = 0, s_idx = cb->args[0];
5766 struct net *net = sock_net(skb->sk);
5767 int family = nfmsg->nfgen_family;
5768 struct nft_flowtable *flowtable;
5769 const struct nft_table *table;
5772 cb->seq = net->nft.base_seq;
5774 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5775 if (family != NFPROTO_UNSPEC && family != table->family)
5778 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5779 if (!nft_is_active(net, flowtable))
5784 memset(&cb->args[1], 0,
5785 sizeof(cb->args) - sizeof(cb->args[0]));
5786 if (filter && filter->table &&
5787 strcmp(filter->table, table->name))
5790 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5792 NFT_MSG_NEWFLOWTABLE,
5793 NLM_F_MULTI | NLM_F_APPEND,
5794 table->family, flowtable) < 0)
5797 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5809 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
5811 const struct nlattr * const *nla = cb->data;
5812 struct nft_flowtable_filter *filter = NULL;
5814 if (nla[NFTA_FLOWTABLE_TABLE]) {
5815 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5819 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5821 if (!filter->table) {
5831 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
5833 struct nft_flowtable_filter *filter = cb->data;
5838 kfree(filter->table);
5844 /* called with rcu_read_lock held */
5845 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
5846 struct sk_buff *skb,
5847 const struct nlmsghdr *nlh,
5848 const struct nlattr * const nla[],
5849 struct netlink_ext_ack *extack)
5851 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5852 u8 genmask = nft_genmask_cur(net);
5853 int family = nfmsg->nfgen_family;
5854 struct nft_flowtable *flowtable;
5855 const struct nft_table *table;
5856 struct sk_buff *skb2;
5859 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5860 struct netlink_dump_control c = {
5861 .start = nf_tables_dump_flowtable_start,
5862 .dump = nf_tables_dump_flowtable,
5863 .done = nf_tables_dump_flowtable_done,
5864 .module = THIS_MODULE,
5865 .data = (void *)nla,
5868 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5871 if (!nla[NFTA_FLOWTABLE_NAME])
5874 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5877 return PTR_ERR(table);
5879 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5881 if (IS_ERR(flowtable))
5882 return PTR_ERR(flowtable);
5884 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5888 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
5890 NFT_MSG_NEWFLOWTABLE, 0, family,
5895 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5901 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
5902 struct nft_flowtable *flowtable,
5905 struct sk_buff *skb;
5909 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
5912 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5916 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
5918 ctx->family, flowtable);
5924 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
5925 ctx->report, GFP_KERNEL);
5928 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
5931 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
5933 kfree(flowtable->ops);
5934 kfree(flowtable->name);
5935 flowtable->data.type->free(&flowtable->data);
5936 module_put(flowtable->data.type->owner);
5940 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
5941 u32 portid, u32 seq)
5943 struct nlmsghdr *nlh;
5944 struct nfgenmsg *nfmsg;
5945 char buf[TASK_COMM_LEN];
5946 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
5948 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
5950 goto nla_put_failure;
5952 nfmsg = nlmsg_data(nlh);
5953 nfmsg->nfgen_family = AF_UNSPEC;
5954 nfmsg->version = NFNETLINK_V0;
5955 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5957 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
5958 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
5959 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
5960 goto nla_put_failure;
5962 nlmsg_end(skb, nlh);
5966 nlmsg_trim(skb, nlh);
5970 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
5971 struct nft_flowtable *flowtable)
5975 for (i = 0; i < flowtable->ops_len; i++) {
5976 if (flowtable->ops[i].dev != dev)
5979 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
5980 flowtable->ops[i].dev = NULL;
5985 static int nf_tables_flowtable_event(struct notifier_block *this,
5986 unsigned long event, void *ptr)
5988 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5989 struct nft_flowtable *flowtable;
5990 struct nft_table *table;
5993 if (event != NETDEV_UNREGISTER)
5997 mutex_lock(&net->nft.commit_mutex);
5998 list_for_each_entry(table, &net->nft.tables, list) {
5999 list_for_each_entry(flowtable, &table->flowtables, list) {
6000 nft_flowtable_event(event, dev, flowtable);
6003 mutex_unlock(&net->nft.commit_mutex);
6008 static struct notifier_block nf_tables_flowtable_notifier = {
6009 .notifier_call = nf_tables_flowtable_event,
6012 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
6015 struct nlmsghdr *nlh = nlmsg_hdr(skb);
6016 struct sk_buff *skb2;
6019 if (nlmsg_report(nlh) &&
6020 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6023 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6027 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6034 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6035 nlmsg_report(nlh), GFP_KERNEL);
6038 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6042 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6043 struct sk_buff *skb, const struct nlmsghdr *nlh,
6044 const struct nlattr * const nla[],
6045 struct netlink_ext_ack *extack)
6047 struct sk_buff *skb2;
6050 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6054 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6059 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6065 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6066 [NFT_MSG_NEWTABLE] = {
6067 .call_batch = nf_tables_newtable,
6068 .attr_count = NFTA_TABLE_MAX,
6069 .policy = nft_table_policy,
6071 [NFT_MSG_GETTABLE] = {
6072 .call_rcu = nf_tables_gettable,
6073 .attr_count = NFTA_TABLE_MAX,
6074 .policy = nft_table_policy,
6076 [NFT_MSG_DELTABLE] = {
6077 .call_batch = nf_tables_deltable,
6078 .attr_count = NFTA_TABLE_MAX,
6079 .policy = nft_table_policy,
6081 [NFT_MSG_NEWCHAIN] = {
6082 .call_batch = nf_tables_newchain,
6083 .attr_count = NFTA_CHAIN_MAX,
6084 .policy = nft_chain_policy,
6086 [NFT_MSG_GETCHAIN] = {
6087 .call_rcu = nf_tables_getchain,
6088 .attr_count = NFTA_CHAIN_MAX,
6089 .policy = nft_chain_policy,
6091 [NFT_MSG_DELCHAIN] = {
6092 .call_batch = nf_tables_delchain,
6093 .attr_count = NFTA_CHAIN_MAX,
6094 .policy = nft_chain_policy,
6096 [NFT_MSG_NEWRULE] = {
6097 .call_batch = nf_tables_newrule,
6098 .attr_count = NFTA_RULE_MAX,
6099 .policy = nft_rule_policy,
6101 [NFT_MSG_GETRULE] = {
6102 .call_rcu = nf_tables_getrule,
6103 .attr_count = NFTA_RULE_MAX,
6104 .policy = nft_rule_policy,
6106 [NFT_MSG_DELRULE] = {
6107 .call_batch = nf_tables_delrule,
6108 .attr_count = NFTA_RULE_MAX,
6109 .policy = nft_rule_policy,
6111 [NFT_MSG_NEWSET] = {
6112 .call_batch = nf_tables_newset,
6113 .attr_count = NFTA_SET_MAX,
6114 .policy = nft_set_policy,
6116 [NFT_MSG_GETSET] = {
6117 .call_rcu = nf_tables_getset,
6118 .attr_count = NFTA_SET_MAX,
6119 .policy = nft_set_policy,
6121 [NFT_MSG_DELSET] = {
6122 .call_batch = nf_tables_delset,
6123 .attr_count = NFTA_SET_MAX,
6124 .policy = nft_set_policy,
6126 [NFT_MSG_NEWSETELEM] = {
6127 .call_batch = nf_tables_newsetelem,
6128 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6129 .policy = nft_set_elem_list_policy,
6131 [NFT_MSG_GETSETELEM] = {
6132 .call_rcu = nf_tables_getsetelem,
6133 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6134 .policy = nft_set_elem_list_policy,
6136 [NFT_MSG_DELSETELEM] = {
6137 .call_batch = nf_tables_delsetelem,
6138 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6139 .policy = nft_set_elem_list_policy,
6141 [NFT_MSG_GETGEN] = {
6142 .call_rcu = nf_tables_getgen,
6144 [NFT_MSG_NEWOBJ] = {
6145 .call_batch = nf_tables_newobj,
6146 .attr_count = NFTA_OBJ_MAX,
6147 .policy = nft_obj_policy,
6149 [NFT_MSG_GETOBJ] = {
6150 .call_rcu = nf_tables_getobj,
6151 .attr_count = NFTA_OBJ_MAX,
6152 .policy = nft_obj_policy,
6154 [NFT_MSG_DELOBJ] = {
6155 .call_batch = nf_tables_delobj,
6156 .attr_count = NFTA_OBJ_MAX,
6157 .policy = nft_obj_policy,
6159 [NFT_MSG_GETOBJ_RESET] = {
6160 .call_rcu = nf_tables_getobj,
6161 .attr_count = NFTA_OBJ_MAX,
6162 .policy = nft_obj_policy,
6164 [NFT_MSG_NEWFLOWTABLE] = {
6165 .call_batch = nf_tables_newflowtable,
6166 .attr_count = NFTA_FLOWTABLE_MAX,
6167 .policy = nft_flowtable_policy,
6169 [NFT_MSG_GETFLOWTABLE] = {
6170 .call_rcu = nf_tables_getflowtable,
6171 .attr_count = NFTA_FLOWTABLE_MAX,
6172 .policy = nft_flowtable_policy,
6174 [NFT_MSG_DELFLOWTABLE] = {
6175 .call_batch = nf_tables_delflowtable,
6176 .attr_count = NFTA_FLOWTABLE_MAX,
6177 .policy = nft_flowtable_policy,
6181 static int nf_tables_validate(struct net *net)
6183 struct nft_table *table;
6185 switch (net->nft.validate_state) {
6186 case NFT_VALIDATE_SKIP:
6188 case NFT_VALIDATE_NEED:
6189 nft_validate_state_update(net, NFT_VALIDATE_DO);
6191 case NFT_VALIDATE_DO:
6192 list_for_each_entry(table, &net->nft.tables, list) {
6193 if (nft_table_validate(net, table) < 0)
6202 static void nft_chain_commit_update(struct nft_trans *trans)
6204 struct nft_base_chain *basechain;
6206 if (nft_trans_chain_name(trans)) {
6207 rhltable_remove(&trans->ctx.table->chains_ht,
6208 &trans->ctx.chain->rhlhead,
6209 nft_chain_ht_params);
6210 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6211 rhltable_insert_key(&trans->ctx.table->chains_ht,
6212 trans->ctx.chain->name,
6213 &trans->ctx.chain->rhlhead,
6214 nft_chain_ht_params);
6217 if (!nft_is_base_chain(trans->ctx.chain))
6220 basechain = nft_base_chain(trans->ctx.chain);
6221 nft_chain_stats_replace(trans->ctx.net, basechain,
6222 nft_trans_chain_stats(trans));
6224 switch (nft_trans_chain_policy(trans)) {
6227 basechain->policy = nft_trans_chain_policy(trans);
6232 static void nft_commit_release(struct nft_trans *trans)
6234 switch (trans->msg_type) {
6235 case NFT_MSG_DELTABLE:
6236 nf_tables_table_destroy(&trans->ctx);
6238 case NFT_MSG_NEWCHAIN:
6239 kfree(nft_trans_chain_name(trans));
6241 case NFT_MSG_DELCHAIN:
6242 nf_tables_chain_destroy(&trans->ctx);
6244 case NFT_MSG_DELRULE:
6245 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6247 case NFT_MSG_DELSET:
6248 nft_set_destroy(nft_trans_set(trans));
6250 case NFT_MSG_DELSETELEM:
6251 nf_tables_set_elem_destroy(&trans->ctx,
6252 nft_trans_elem_set(trans),
6253 nft_trans_elem(trans).priv);
6255 case NFT_MSG_DELOBJ:
6256 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6258 case NFT_MSG_DELFLOWTABLE:
6259 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6264 put_net(trans->ctx.net);
6269 static void nf_tables_trans_destroy_work(struct work_struct *w)
6271 struct nft_trans *trans, *next;
6274 spin_lock(&nf_tables_destroy_list_lock);
6275 list_splice_init(&nf_tables_destroy_list, &head);
6276 spin_unlock(&nf_tables_destroy_list_lock);
6278 if (list_empty(&head))
6283 list_for_each_entry_safe(trans, next, &head, list) {
6284 list_del(&trans->list);
6285 nft_commit_release(trans);
6289 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6291 struct nft_rule *rule;
6292 unsigned int alloc = 0;
6295 /* already handled or inactive chain? */
6296 if (chain->rules_next || !nft_is_active_next(net, chain))
6299 rule = list_entry(&chain->rules, struct nft_rule, list);
6302 list_for_each_entry_continue(rule, &chain->rules, list) {
6303 if (nft_is_active_next(net, rule))
6307 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6308 if (!chain->rules_next)
6311 list_for_each_entry_continue(rule, &chain->rules, list) {
6312 if (nft_is_active_next(net, rule))
6313 chain->rules_next[i++] = rule;
6316 chain->rules_next[i] = NULL;
6320 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6322 struct nft_trans *trans, *next;
6324 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6325 struct nft_chain *chain = trans->ctx.chain;
6327 if (trans->msg_type == NFT_MSG_NEWRULE ||
6328 trans->msg_type == NFT_MSG_DELRULE) {
6329 kvfree(chain->rules_next);
6330 chain->rules_next = NULL;
6335 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6337 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6342 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6344 struct nft_rule **r = rules;
6345 struct nft_rules_old *old;
6350 r++; /* rcu_head is after end marker */
6354 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6357 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
6359 struct nft_rule **g0, **g1;
6362 next_genbit = nft_gencursor_next(net);
6364 g0 = rcu_dereference_protected(chain->rules_gen_0,
6365 lockdep_commit_lock_is_held(net));
6366 g1 = rcu_dereference_protected(chain->rules_gen_1,
6367 lockdep_commit_lock_is_held(net));
6369 /* No changes to this chain? */
6370 if (chain->rules_next == NULL) {
6371 /* chain had no change in last or next generation */
6375 * chain had no change in this generation; make sure next
6376 * one uses same rules as current generation.
6379 rcu_assign_pointer(chain->rules_gen_1, g0);
6380 nf_tables_commit_chain_free_rules_old(g1);
6382 rcu_assign_pointer(chain->rules_gen_0, g1);
6383 nf_tables_commit_chain_free_rules_old(g0);
6390 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6392 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6394 chain->rules_next = NULL;
6400 nf_tables_commit_chain_free_rules_old(g1);
6402 nf_tables_commit_chain_free_rules_old(g0);
6405 static void nft_chain_del(struct nft_chain *chain)
6407 struct nft_table *table = chain->table;
6409 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6410 nft_chain_ht_params));
6411 list_del_rcu(&chain->list);
6414 static void nf_tables_commit_release(struct net *net)
6416 struct nft_trans *trans;
6418 /* all side effects have to be made visible.
6419 * For example, if a chain named 'foo' has been deleted, a
6420 * new transaction must not find it anymore.
6422 * Memory reclaim happens asynchronously from work queue
6423 * to prevent expensive synchronize_rcu() in commit phase.
6425 if (list_empty(&net->nft.commit_list)) {
6426 mutex_unlock(&net->nft.commit_mutex);
6430 trans = list_last_entry(&net->nft.commit_list,
6431 struct nft_trans, list);
6432 get_net(trans->ctx.net);
6433 WARN_ON_ONCE(trans->put_net);
6435 trans->put_net = true;
6436 spin_lock(&nf_tables_destroy_list_lock);
6437 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
6438 spin_unlock(&nf_tables_destroy_list_lock);
6440 mutex_unlock(&net->nft.commit_mutex);
6442 schedule_work(&trans_destroy_work);
6445 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
6447 struct nft_trans *trans, *next;
6448 struct nft_trans_elem *te;
6449 struct nft_chain *chain;
6450 struct nft_table *table;
6452 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6453 if (nf_tables_validate(net) < 0)
6456 /* 1. Allocate space for next generation rules_gen_X[] */
6457 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6460 if (trans->msg_type == NFT_MSG_NEWRULE ||
6461 trans->msg_type == NFT_MSG_DELRULE) {
6462 chain = trans->ctx.chain;
6464 ret = nf_tables_commit_chain_prepare(net, chain);
6466 nf_tables_commit_chain_prepare_cancel(net);
6472 /* step 2. Make rules_gen_X visible to packet path */
6473 list_for_each_entry(table, &net->nft.tables, list) {
6474 list_for_each_entry(chain, &table->chains, list)
6475 nf_tables_commit_chain(net, chain);
6479 * Bump generation counter, invalidate any dump in progress.
6480 * Cannot fail after this point.
6482 while (++net->nft.base_seq == 0);
6484 /* step 3. Start new generation, rules_gen_X now in use. */
6485 net->nft.gencursor = nft_gencursor_next(net);
6487 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6488 switch (trans->msg_type) {
6489 case NFT_MSG_NEWTABLE:
6490 if (nft_trans_table_update(trans)) {
6491 if (!nft_trans_table_enable(trans)) {
6492 nf_tables_table_disable(net,
6494 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6497 nft_clear(net, trans->ctx.table);
6499 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
6500 nft_trans_destroy(trans);
6502 case NFT_MSG_DELTABLE:
6503 list_del_rcu(&trans->ctx.table->list);
6504 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
6506 case NFT_MSG_NEWCHAIN:
6507 if (nft_trans_chain_update(trans)) {
6508 nft_chain_commit_update(trans);
6509 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6510 /* trans destroyed after rcu grace period */
6512 nft_clear(net, trans->ctx.chain);
6513 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6514 nft_trans_destroy(trans);
6517 case NFT_MSG_DELCHAIN:
6518 nft_chain_del(trans->ctx.chain);
6519 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
6520 nf_tables_unregister_hook(trans->ctx.net,
6524 case NFT_MSG_NEWRULE:
6525 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6526 nf_tables_rule_notify(&trans->ctx,
6527 nft_trans_rule(trans),
6529 nft_trans_destroy(trans);
6531 case NFT_MSG_DELRULE:
6532 list_del_rcu(&nft_trans_rule(trans)->list);
6533 nf_tables_rule_notify(&trans->ctx,
6534 nft_trans_rule(trans),
6537 case NFT_MSG_NEWSET:
6538 nft_clear(net, nft_trans_set(trans));
6539 /* This avoids hitting -EBUSY when deleting the table
6540 * from the transaction.
6542 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
6543 !list_empty(&nft_trans_set(trans)->bindings))
6544 trans->ctx.table->use--;
6546 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6547 NFT_MSG_NEWSET, GFP_KERNEL);
6548 nft_trans_destroy(trans);
6550 case NFT_MSG_DELSET:
6551 list_del_rcu(&nft_trans_set(trans)->list);
6552 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6553 NFT_MSG_DELSET, GFP_KERNEL);
6555 case NFT_MSG_NEWSETELEM:
6556 te = (struct nft_trans_elem *)trans->data;
6558 te->set->ops->activate(net, te->set, &te->elem);
6559 nf_tables_setelem_notify(&trans->ctx, te->set,
6561 NFT_MSG_NEWSETELEM, 0);
6562 nft_trans_destroy(trans);
6564 case NFT_MSG_DELSETELEM:
6565 te = (struct nft_trans_elem *)trans->data;
6567 nf_tables_setelem_notify(&trans->ctx, te->set,
6569 NFT_MSG_DELSETELEM, 0);
6570 te->set->ops->remove(net, te->set, &te->elem);
6571 atomic_dec(&te->set->nelems);
6574 case NFT_MSG_NEWOBJ:
6575 nft_clear(net, nft_trans_obj(trans));
6576 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6578 nft_trans_destroy(trans);
6580 case NFT_MSG_DELOBJ:
6581 list_del_rcu(&nft_trans_obj(trans)->list);
6582 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6585 case NFT_MSG_NEWFLOWTABLE:
6586 nft_clear(net, nft_trans_flowtable(trans));
6587 nf_tables_flowtable_notify(&trans->ctx,
6588 nft_trans_flowtable(trans),
6589 NFT_MSG_NEWFLOWTABLE);
6590 nft_trans_destroy(trans);
6592 case NFT_MSG_DELFLOWTABLE:
6593 list_del_rcu(&nft_trans_flowtable(trans)->list);
6594 nf_tables_flowtable_notify(&trans->ctx,
6595 nft_trans_flowtable(trans),
6596 NFT_MSG_DELFLOWTABLE);
6597 nft_unregister_flowtable_net_hooks(net,
6598 nft_trans_flowtable(trans));
6603 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
6604 nf_tables_commit_release(net);
6609 static void nf_tables_abort_release(struct nft_trans *trans)
6611 switch (trans->msg_type) {
6612 case NFT_MSG_NEWTABLE:
6613 nf_tables_table_destroy(&trans->ctx);
6615 case NFT_MSG_NEWCHAIN:
6616 nf_tables_chain_destroy(&trans->ctx);
6618 case NFT_MSG_NEWRULE:
6619 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6621 case NFT_MSG_NEWSET:
6622 nft_set_destroy(nft_trans_set(trans));
6624 case NFT_MSG_NEWSETELEM:
6625 nft_set_elem_destroy(nft_trans_elem_set(trans),
6626 nft_trans_elem(trans).priv, true);
6628 case NFT_MSG_NEWOBJ:
6629 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6631 case NFT_MSG_NEWFLOWTABLE:
6632 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6638 static int __nf_tables_abort(struct net *net)
6640 struct nft_trans *trans, *next;
6641 struct nft_trans_elem *te;
6643 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6645 switch (trans->msg_type) {
6646 case NFT_MSG_NEWTABLE:
6647 if (nft_trans_table_update(trans)) {
6648 if (nft_trans_table_enable(trans)) {
6649 nf_tables_table_disable(net,
6651 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6653 nft_trans_destroy(trans);
6655 list_del_rcu(&trans->ctx.table->list);
6658 case NFT_MSG_DELTABLE:
6659 nft_clear(trans->ctx.net, trans->ctx.table);
6660 nft_trans_destroy(trans);
6662 case NFT_MSG_NEWCHAIN:
6663 if (nft_trans_chain_update(trans)) {
6664 free_percpu(nft_trans_chain_stats(trans));
6665 kfree(nft_trans_chain_name(trans));
6666 nft_trans_destroy(trans);
6668 trans->ctx.table->use--;
6669 nft_chain_del(trans->ctx.chain);
6670 nf_tables_unregister_hook(trans->ctx.net,
6675 case NFT_MSG_DELCHAIN:
6676 trans->ctx.table->use++;
6677 nft_clear(trans->ctx.net, trans->ctx.chain);
6678 nft_trans_destroy(trans);
6680 case NFT_MSG_NEWRULE:
6681 trans->ctx.chain->use--;
6682 list_del_rcu(&nft_trans_rule(trans)->list);
6683 nft_rule_expr_deactivate(&trans->ctx, nft_trans_rule(trans));
6685 case NFT_MSG_DELRULE:
6686 trans->ctx.chain->use++;
6687 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6688 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
6689 nft_trans_destroy(trans);
6691 case NFT_MSG_NEWSET:
6692 trans->ctx.table->use--;
6693 list_del_rcu(&nft_trans_set(trans)->list);
6695 case NFT_MSG_DELSET:
6696 trans->ctx.table->use++;
6697 nft_clear(trans->ctx.net, nft_trans_set(trans));
6698 nft_trans_destroy(trans);
6700 case NFT_MSG_NEWSETELEM:
6701 te = (struct nft_trans_elem *)trans->data;
6703 te->set->ops->remove(net, te->set, &te->elem);
6704 atomic_dec(&te->set->nelems);
6706 case NFT_MSG_DELSETELEM:
6707 te = (struct nft_trans_elem *)trans->data;
6709 nft_set_elem_activate(net, te->set, &te->elem);
6710 te->set->ops->activate(net, te->set, &te->elem);
6713 nft_trans_destroy(trans);
6715 case NFT_MSG_NEWOBJ:
6716 trans->ctx.table->use--;
6717 list_del_rcu(&nft_trans_obj(trans)->list);
6719 case NFT_MSG_DELOBJ:
6720 trans->ctx.table->use++;
6721 nft_clear(trans->ctx.net, nft_trans_obj(trans));
6722 nft_trans_destroy(trans);
6724 case NFT_MSG_NEWFLOWTABLE:
6725 trans->ctx.table->use--;
6726 list_del_rcu(&nft_trans_flowtable(trans)->list);
6727 nft_unregister_flowtable_net_hooks(net,
6728 nft_trans_flowtable(trans));
6730 case NFT_MSG_DELFLOWTABLE:
6731 trans->ctx.table->use++;
6732 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6733 nft_trans_destroy(trans);
6740 list_for_each_entry_safe_reverse(trans, next,
6741 &net->nft.commit_list, list) {
6742 list_del(&trans->list);
6743 nf_tables_abort_release(trans);
6749 static void nf_tables_cleanup(struct net *net)
6751 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
6754 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6756 int ret = __nf_tables_abort(net);
6758 mutex_unlock(&net->nft.commit_mutex);
6763 static bool nf_tables_valid_genid(struct net *net, u32 genid)
6767 mutex_lock(&net->nft.commit_mutex);
6769 genid_ok = genid == 0 || net->nft.base_seq == genid;
6771 mutex_unlock(&net->nft.commit_mutex);
6773 /* else, commit mutex has to be released by commit or abort function */
6777 static const struct nfnetlink_subsystem nf_tables_subsys = {
6778 .name = "nf_tables",
6779 .subsys_id = NFNL_SUBSYS_NFTABLES,
6780 .cb_count = NFT_MSG_MAX,
6782 .commit = nf_tables_commit,
6783 .abort = nf_tables_abort,
6784 .cleanup = nf_tables_cleanup,
6785 .valid_genid = nf_tables_valid_genid,
6786 .owner = THIS_MODULE,
6789 int nft_chain_validate_dependency(const struct nft_chain *chain,
6790 enum nft_chain_types type)
6792 const struct nft_base_chain *basechain;
6794 if (nft_is_base_chain(chain)) {
6795 basechain = nft_base_chain(chain);
6796 if (basechain->type->type != type)
6801 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
6803 int nft_chain_validate_hooks(const struct nft_chain *chain,
6804 unsigned int hook_flags)
6806 struct nft_base_chain *basechain;
6808 if (nft_is_base_chain(chain)) {
6809 basechain = nft_base_chain(chain);
6811 if ((1 << basechain->ops.hooknum) & hook_flags)
6819 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
6822 * Loop detection - walk through the ruleset beginning at the destination chain
6823 * of a new jump until either the source chain is reached (loop) or all
6824 * reachable chains have been traversed.
6826 * The loop check is performed whenever a new jump verdict is added to an
6827 * expression or verdict map or a verdict map is bound to a new chain.
6830 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6831 const struct nft_chain *chain);
6833 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
6834 struct nft_set *set,
6835 const struct nft_set_iter *iter,
6836 struct nft_set_elem *elem)
6838 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6839 const struct nft_data *data;
6841 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6842 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
6845 data = nft_set_ext_data(ext);
6846 switch (data->verdict.code) {
6849 return nf_tables_check_loops(ctx, data->verdict.chain);
6855 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6856 const struct nft_chain *chain)
6858 const struct nft_rule *rule;
6859 const struct nft_expr *expr, *last;
6860 struct nft_set *set;
6861 struct nft_set_binding *binding;
6862 struct nft_set_iter iter;
6864 if (ctx->chain == chain)
6867 list_for_each_entry(rule, &chain->rules, list) {
6868 nft_rule_for_each_expr(expr, last, rule) {
6869 struct nft_immediate_expr *priv;
6870 const struct nft_data *data;
6873 if (strcmp(expr->ops->type->name, "immediate"))
6876 priv = nft_expr_priv(expr);
6877 if (priv->dreg != NFT_REG_VERDICT)
6881 switch (data->verdict.code) {
6884 err = nf_tables_check_loops(ctx,
6885 data->verdict.chain);
6894 list_for_each_entry(set, &ctx->table->sets, list) {
6895 if (!nft_is_active_next(ctx->net, set))
6897 if (!(set->flags & NFT_SET_MAP) ||
6898 set->dtype != NFT_DATA_VERDICT)
6901 list_for_each_entry(binding, &set->bindings, list) {
6902 if (!(binding->flags & NFT_SET_MAP) ||
6903 binding->chain != chain)
6906 iter.genmask = nft_genmask_next(ctx->net);
6910 iter.fn = nf_tables_loop_check_setelem;
6912 set->ops->walk(ctx, set, &iter);
6922 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
6924 * @attr: netlink attribute to fetch value from
6925 * @max: maximum value to be stored in dest
6926 * @dest: pointer to the variable
6928 * Parse, check and store a given u32 netlink attribute into variable.
6929 * This function returns -ERANGE if the value goes over maximum value.
6930 * Otherwise a 0 is returned and the attribute value is stored in the
6931 * destination variable.
6933 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
6937 val = ntohl(nla_get_be32(attr));
6944 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
6947 * nft_parse_register - parse a register value from a netlink attribute
6949 * @attr: netlink attribute
6951 * Parse and translate a register value from a netlink attribute.
6952 * Registers used to be 128 bit wide, these register numbers will be
6953 * mapped to the corresponding 32 bit register numbers.
6955 unsigned int nft_parse_register(const struct nlattr *attr)
6959 reg = ntohl(nla_get_be32(attr));
6961 case NFT_REG_VERDICT...NFT_REG_4:
6962 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
6964 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
6967 EXPORT_SYMBOL_GPL(nft_parse_register);
6970 * nft_dump_register - dump a register value to a netlink attribute
6972 * @skb: socket buffer
6973 * @attr: attribute number
6974 * @reg: register number
6976 * Construct a netlink attribute containing the register number. For
6977 * compatibility reasons, register numbers being a multiple of 4 are
6978 * translated to the corresponding 128 bit register numbers.
6980 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
6982 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
6983 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
6985 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
6987 return nla_put_be32(skb, attr, htonl(reg));
6989 EXPORT_SYMBOL_GPL(nft_dump_register);
6992 * nft_validate_register_load - validate a load from a register
6994 * @reg: the register number
6995 * @len: the length of the data
6997 * Validate that the input register is one of the general purpose
6998 * registers and that the length of the load is within the bounds.
7000 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
7002 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7006 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
7011 EXPORT_SYMBOL_GPL(nft_validate_register_load);
7014 * nft_validate_register_store - validate an expressions' register store
7016 * @ctx: context of the expression performing the load
7017 * @reg: the destination register number
7018 * @data: the data to load
7019 * @type: the data type
7020 * @len: the length of the data
7022 * Validate that a data load uses the appropriate data type for
7023 * the destination register and the length is within the bounds.
7024 * A value of NULL for the data means that its runtime gathered
7027 int nft_validate_register_store(const struct nft_ctx *ctx,
7028 enum nft_registers reg,
7029 const struct nft_data *data,
7030 enum nft_data_types type, unsigned int len)
7035 case NFT_REG_VERDICT:
7036 if (type != NFT_DATA_VERDICT)
7040 (data->verdict.code == NFT_GOTO ||
7041 data->verdict.code == NFT_JUMP)) {
7042 err = nf_tables_check_loops(ctx, data->verdict.chain);
7049 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7053 if (reg * NFT_REG32_SIZE + len >
7054 FIELD_SIZEOF(struct nft_regs, data))
7057 if (data != NULL && type != NFT_DATA_VALUE)
7062 EXPORT_SYMBOL_GPL(nft_validate_register_store);
7064 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7065 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7066 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7067 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7070 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7071 struct nft_data_desc *desc, const struct nlattr *nla)
7073 u8 genmask = nft_genmask_next(ctx->net);
7074 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7075 struct nft_chain *chain;
7078 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
7083 if (!tb[NFTA_VERDICT_CODE])
7085 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
7087 switch (data->verdict.code) {
7089 switch (data->verdict.code & NF_VERDICT_MASK) {
7104 if (!tb[NFTA_VERDICT_CHAIN])
7106 chain = nft_chain_lookup(ctx->net, ctx->table,
7107 tb[NFTA_VERDICT_CHAIN], genmask);
7109 return PTR_ERR(chain);
7110 if (nft_is_base_chain(chain))
7114 data->verdict.chain = chain;
7118 desc->len = sizeof(data->verdict);
7119 desc->type = NFT_DATA_VERDICT;
7123 static void nft_verdict_uninit(const struct nft_data *data)
7125 switch (data->verdict.code) {
7128 data->verdict.chain->use--;
7133 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
7135 struct nlattr *nest;
7137 nest = nla_nest_start(skb, type);
7139 goto nla_put_failure;
7141 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
7142 goto nla_put_failure;
7147 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
7149 goto nla_put_failure;
7151 nla_nest_end(skb, nest);
7158 static int nft_value_init(const struct nft_ctx *ctx,
7159 struct nft_data *data, unsigned int size,
7160 struct nft_data_desc *desc, const struct nlattr *nla)
7170 nla_memcpy(data->data, nla, len);
7171 desc->type = NFT_DATA_VALUE;
7176 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7179 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7182 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
7183 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
7184 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7188 * nft_data_init - parse nf_tables data netlink attributes
7190 * @ctx: context of the expression using the data
7191 * @data: destination struct nft_data
7192 * @size: maximum data length
7193 * @desc: data description
7194 * @nla: netlink attribute containing data
7196 * Parse the netlink data attributes and initialize a struct nft_data.
7197 * The type and length of data are returned in the data description.
7199 * The caller can indicate that it only wants to accept data of type
7200 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7202 int nft_data_init(const struct nft_ctx *ctx,
7203 struct nft_data *data, unsigned int size,
7204 struct nft_data_desc *desc, const struct nlattr *nla)
7206 struct nlattr *tb[NFTA_DATA_MAX + 1];
7209 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
7213 if (tb[NFTA_DATA_VALUE])
7214 return nft_value_init(ctx, data, size, desc,
7215 tb[NFTA_DATA_VALUE]);
7216 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7217 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7220 EXPORT_SYMBOL_GPL(nft_data_init);
7223 * nft_data_release - release a nft_data item
7225 * @data: struct nft_data to release
7226 * @type: type of data
7228 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7229 * all others need to be released by calling this function.
7231 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
7233 if (type < NFT_DATA_VERDICT)
7236 case NFT_DATA_VERDICT:
7237 return nft_verdict_uninit(data);
7242 EXPORT_SYMBOL_GPL(nft_data_release);
7244 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7245 enum nft_data_types type, unsigned int len)
7247 struct nlattr *nest;
7250 nest = nla_nest_start(skb, attr);
7255 case NFT_DATA_VALUE:
7256 err = nft_value_dump(skb, data, len);
7258 case NFT_DATA_VERDICT:
7259 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
7266 nla_nest_end(skb, nest);
7269 EXPORT_SYMBOL_GPL(nft_data_dump);
7271 int __nft_release_basechain(struct nft_ctx *ctx)
7273 struct nft_rule *rule, *nr;
7275 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
7278 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
7279 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7280 list_del(&rule->list);
7282 nf_tables_rule_release(ctx, rule);
7284 nft_chain_del(ctx->chain);
7286 nf_tables_chain_destroy(ctx);
7290 EXPORT_SYMBOL_GPL(__nft_release_basechain);
7292 static void __nft_release_tables(struct net *net)
7294 struct nft_flowtable *flowtable, *nf;
7295 struct nft_table *table, *nt;
7296 struct nft_chain *chain, *nc;
7297 struct nft_object *obj, *ne;
7298 struct nft_rule *rule, *nr;
7299 struct nft_set *set, *ns;
7300 struct nft_ctx ctx = {
7302 .family = NFPROTO_NETDEV,
7305 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
7306 ctx.family = table->family;
7308 list_for_each_entry(chain, &table->chains, list)
7309 nf_tables_unregister_hook(net, table, chain);
7310 /* No packets are walking on these chains anymore. */
7312 list_for_each_entry(chain, &table->chains, list) {
7314 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7315 list_del(&rule->list);
7317 nf_tables_rule_release(&ctx, rule);
7320 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7321 list_del(&flowtable->list);
7323 nf_tables_flowtable_destroy(flowtable);
7325 list_for_each_entry_safe(set, ns, &table->sets, list) {
7326 list_del(&set->list);
7328 nft_set_destroy(set);
7330 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7331 list_del(&obj->list);
7333 nft_obj_destroy(&ctx, obj);
7335 list_for_each_entry_safe(chain, nc, &table->chains, list) {
7337 nft_chain_del(chain);
7339 nf_tables_chain_destroy(&ctx);
7341 list_del(&table->list);
7342 nf_tables_table_destroy(&ctx);
7346 static int __net_init nf_tables_init_net(struct net *net)
7348 INIT_LIST_HEAD(&net->nft.tables);
7349 INIT_LIST_HEAD(&net->nft.commit_list);
7350 mutex_init(&net->nft.commit_mutex);
7351 net->nft.base_seq = 1;
7352 net->nft.validate_state = NFT_VALIDATE_SKIP;
7357 static void __net_exit nf_tables_exit_net(struct net *net)
7359 mutex_lock(&net->nft.commit_mutex);
7360 if (!list_empty(&net->nft.commit_list))
7361 __nf_tables_abort(net);
7362 __nft_release_tables(net);
7363 mutex_unlock(&net->nft.commit_mutex);
7364 WARN_ON_ONCE(!list_empty(&net->nft.tables));
7367 static struct pernet_operations nf_tables_net_ops = {
7368 .init = nf_tables_init_net,
7369 .exit = nf_tables_exit_net,
7372 static int __init nf_tables_module_init(void)
7376 spin_lock_init(&nf_tables_destroy_list_lock);
7377 err = register_pernet_subsys(&nf_tables_net_ops);
7381 err = nft_chain_filter_init();
7385 err = nf_tables_core_module_init();
7389 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
7394 err = nfnetlink_subsys_register(&nf_tables_subsys);
7400 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7402 nf_tables_core_module_exit();
7404 nft_chain_filter_fini();
7406 unregister_pernet_subsys(&nf_tables_net_ops);
7410 static void __exit nf_tables_module_exit(void)
7412 nfnetlink_subsys_unregister(&nf_tables_subsys);
7413 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7414 nft_chain_filter_fini();
7415 unregister_pernet_subsys(&nf_tables_net_ops);
7416 cancel_work_sync(&trans_destroy_work);
7418 nf_tables_core_module_exit();
7421 module_init(nf_tables_module_init);
7422 module_exit(nf_tables_module_exit);
7424 MODULE_LICENSE("GPL");
7425 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7426 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);