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/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/net_namespace.h>
24 static LIST_HEAD(nf_tables_expressions);
27 * nft_register_afinfo - register nf_tables address family info
29 * @afi: address family info to register
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
34 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
36 INIT_LIST_HEAD(&afi->tables);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES);
38 list_add_tail_rcu(&afi->list, &net->nft.af_info);
39 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
42 EXPORT_SYMBOL_GPL(nft_register_afinfo);
45 * nft_unregister_afinfo - unregister nf_tables address family info
47 * @afi: address family info to unregister
49 * Unregister the address family for use with nf_tables.
51 void nft_unregister_afinfo(struct nft_af_info *afi)
53 nfnl_lock(NFNL_SUBSYS_NFTABLES);
54 list_del_rcu(&afi->list);
55 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
57 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
59 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
61 struct nft_af_info *afi;
63 list_for_each_entry(afi, &net->nft.af_info, list) {
64 if (afi->family == family)
70 static struct nft_af_info *
71 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
73 struct nft_af_info *afi;
75 afi = nft_afinfo_lookup(net, family);
80 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
81 request_module("nft-afinfo-%u", family);
82 nfnl_lock(NFNL_SUBSYS_NFTABLES);
83 afi = nft_afinfo_lookup(net, family);
85 return ERR_PTR(-EAGAIN);
88 return ERR_PTR(-EAFNOSUPPORT);
91 static void nft_ctx_init(struct nft_ctx *ctx,
92 const struct sk_buff *skb,
93 const struct nlmsghdr *nlh,
94 struct nft_af_info *afi,
95 struct nft_table *table,
96 struct nft_chain *chain,
97 const struct nlattr * const *nla)
99 ctx->net = sock_net(skb->sk);
104 ctx->portid = NETLINK_CB(skb).portid;
105 ctx->report = nlmsg_report(nlh);
106 ctx->seq = nlh->nlmsg_seq;
109 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
112 struct nft_trans *trans;
114 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
118 trans->msg_type = msg_type;
124 static void nft_trans_destroy(struct nft_trans *trans)
126 list_del(&trans->list);
130 static void nf_tables_unregister_hooks(const struct nft_table *table,
131 const struct nft_chain *chain,
132 unsigned int hook_nops)
134 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
135 chain->flags & NFT_BASE_CHAIN)
136 nf_unregister_hooks(nft_base_chain(chain)->ops, hook_nops);
139 /* Internal table flags */
140 #define NFT_TABLE_INACTIVE (1 << 15)
142 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
144 struct nft_trans *trans;
146 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
150 if (msg_type == NFT_MSG_NEWTABLE)
151 ctx->table->flags |= NFT_TABLE_INACTIVE;
153 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
157 static int nft_deltable(struct nft_ctx *ctx)
161 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
165 list_del_rcu(&ctx->table->list);
169 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
171 struct nft_trans *trans;
173 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
177 if (msg_type == NFT_MSG_NEWCHAIN)
178 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
180 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
184 static int nft_delchain(struct nft_ctx *ctx)
188 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
193 list_del_rcu(&ctx->chain->list);
199 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
201 return (rule->genmask & (1 << net->nft.gencursor)) == 0;
204 static inline int gencursor_next(struct net *net)
206 return net->nft.gencursor+1 == 1 ? 1 : 0;
210 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
212 return (rule->genmask & (1 << gencursor_next(net))) == 0;
216 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
218 /* Now inactive, will be active in the future */
219 rule->genmask = (1 << net->nft.gencursor);
223 nft_rule_deactivate_next(struct net *net, struct nft_rule *rule)
225 rule->genmask = (1 << gencursor_next(net));
228 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
234 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
236 /* You cannot delete the same rule twice */
237 if (nft_rule_is_active_next(ctx->net, rule)) {
238 nft_rule_deactivate_next(ctx->net, rule);
245 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
246 struct nft_rule *rule)
248 struct nft_trans *trans;
250 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
254 nft_trans_rule(trans) = rule;
255 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
260 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
262 struct nft_trans *trans;
265 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
269 err = nf_tables_delrule_deactivate(ctx, rule);
271 nft_trans_destroy(trans);
278 static int nft_delrule_by_chain(struct nft_ctx *ctx)
280 struct nft_rule *rule;
283 list_for_each_entry(rule, &ctx->chain->rules, list) {
284 err = nft_delrule(ctx, rule);
291 /* Internal set flag */
292 #define NFT_SET_INACTIVE (1 << 15)
294 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
297 struct nft_trans *trans;
299 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
303 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
304 nft_trans_set_id(trans) =
305 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
306 set->flags |= NFT_SET_INACTIVE;
308 nft_trans_set(trans) = set;
309 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
314 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
318 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
322 list_del_rcu(&set->list);
332 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
333 const struct nlattr *nla)
335 struct nft_table *table;
337 list_for_each_entry(table, &afi->tables, list) {
338 if (!nla_strcmp(nla, table->name))
344 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
345 const struct nlattr *nla)
347 struct nft_table *table;
350 return ERR_PTR(-EINVAL);
352 table = nft_table_lookup(afi, nla);
356 return ERR_PTR(-ENOENT);
359 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
361 return ++table->hgenerator;
364 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
366 static const struct nf_chain_type *
367 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
371 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
372 if (chain_type[family][i] != NULL &&
373 !nla_strcmp(nla, chain_type[family][i]->name))
374 return chain_type[family][i];
379 static const struct nf_chain_type *
380 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
381 const struct nlattr *nla,
384 const struct nf_chain_type *type;
386 type = __nf_tables_chain_type_lookup(afi->family, nla);
389 #ifdef CONFIG_MODULES
391 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
392 request_module("nft-chain-%u-%.*s", afi->family,
393 nla_len(nla), (const char *)nla_data(nla));
394 nfnl_lock(NFNL_SUBSYS_NFTABLES);
395 type = __nf_tables_chain_type_lookup(afi->family, nla);
397 return ERR_PTR(-EAGAIN);
400 return ERR_PTR(-ENOENT);
403 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
404 [NFTA_TABLE_NAME] = { .type = NLA_STRING },
405 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
408 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
409 u32 portid, u32 seq, int event, u32 flags,
410 int family, const struct nft_table *table)
412 struct nlmsghdr *nlh;
413 struct nfgenmsg *nfmsg;
415 event |= NFNL_SUBSYS_NFTABLES << 8;
416 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
418 goto nla_put_failure;
420 nfmsg = nlmsg_data(nlh);
421 nfmsg->nfgen_family = family;
422 nfmsg->version = NFNETLINK_V0;
423 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
425 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
426 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
427 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
428 goto nla_put_failure;
430 return nlmsg_end(skb, nlh);
433 nlmsg_trim(skb, nlh);
437 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
443 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
447 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
451 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
452 event, 0, ctx->afi->family, ctx->table);
458 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
459 ctx->report, GFP_KERNEL);
462 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
468 static int nf_tables_dump_tables(struct sk_buff *skb,
469 struct netlink_callback *cb)
471 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
472 const struct nft_af_info *afi;
473 const struct nft_table *table;
474 unsigned int idx = 0, s_idx = cb->args[0];
475 struct net *net = sock_net(skb->sk);
476 int family = nfmsg->nfgen_family;
479 cb->seq = net->nft.base_seq;
481 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
482 if (family != NFPROTO_UNSPEC && family != afi->family)
485 list_for_each_entry_rcu(table, &afi->tables, list) {
489 memset(&cb->args[1], 0,
490 sizeof(cb->args) - sizeof(cb->args[0]));
491 if (nf_tables_fill_table_info(skb, net,
492 NETLINK_CB(cb->skb).portid,
496 afi->family, table) < 0)
499 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
510 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
511 const struct nlmsghdr *nlh,
512 const struct nlattr * const nla[])
514 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
515 const struct nft_af_info *afi;
516 const struct nft_table *table;
517 struct sk_buff *skb2;
518 struct net *net = sock_net(skb->sk);
519 int family = nfmsg->nfgen_family;
522 if (nlh->nlmsg_flags & NLM_F_DUMP) {
523 struct netlink_dump_control c = {
524 .dump = nf_tables_dump_tables,
526 return netlink_dump_start(nlsk, skb, nlh, &c);
529 afi = nf_tables_afinfo_lookup(net, family, false);
533 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
535 return PTR_ERR(table);
536 if (table->flags & NFT_TABLE_INACTIVE)
539 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
543 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
544 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
549 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
556 static int nf_tables_table_enable(const struct nft_af_info *afi,
557 struct nft_table *table)
559 struct nft_chain *chain;
562 list_for_each_entry(chain, &table->chains, list) {
563 if (!(chain->flags & NFT_BASE_CHAIN))
566 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
574 list_for_each_entry(chain, &table->chains, list) {
575 if (!(chain->flags & NFT_BASE_CHAIN))
581 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
586 static void nf_tables_table_disable(const struct nft_af_info *afi,
587 struct nft_table *table)
589 struct nft_chain *chain;
591 list_for_each_entry(chain, &table->chains, list) {
592 if (chain->flags & NFT_BASE_CHAIN)
593 nf_unregister_hooks(nft_base_chain(chain)->ops,
598 static int nf_tables_updtable(struct nft_ctx *ctx)
600 struct nft_trans *trans;
604 if (!ctx->nla[NFTA_TABLE_FLAGS])
607 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
608 if (flags & ~NFT_TABLE_F_DORMANT)
611 if (flags == ctx->table->flags)
614 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
615 sizeof(struct nft_trans_table));
619 if ((flags & NFT_TABLE_F_DORMANT) &&
620 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
621 nft_trans_table_enable(trans) = false;
622 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
623 ctx->table->flags & NFT_TABLE_F_DORMANT) {
624 ret = nf_tables_table_enable(ctx->afi, ctx->table);
626 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
627 nft_trans_table_enable(trans) = true;
633 nft_trans_table_update(trans) = true;
634 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
637 nft_trans_destroy(trans);
641 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
642 const struct nlmsghdr *nlh,
643 const struct nlattr * const nla[])
645 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
646 const struct nlattr *name;
647 struct nft_af_info *afi;
648 struct nft_table *table;
649 struct net *net = sock_net(skb->sk);
650 int family = nfmsg->nfgen_family;
655 afi = nf_tables_afinfo_lookup(net, family, true);
659 name = nla[NFTA_TABLE_NAME];
660 table = nf_tables_table_lookup(afi, name);
662 if (PTR_ERR(table) != -ENOENT)
663 return PTR_ERR(table);
668 if (table->flags & NFT_TABLE_INACTIVE)
670 if (nlh->nlmsg_flags & NLM_F_EXCL)
672 if (nlh->nlmsg_flags & NLM_F_REPLACE)
675 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
676 return nf_tables_updtable(&ctx);
679 if (nla[NFTA_TABLE_FLAGS]) {
680 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
681 if (flags & ~NFT_TABLE_F_DORMANT)
685 if (!try_module_get(afi->owner))
686 return -EAFNOSUPPORT;
688 table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL);
690 module_put(afi->owner);
694 nla_strlcpy(table->name, name, nla_len(name));
695 INIT_LIST_HEAD(&table->chains);
696 INIT_LIST_HEAD(&table->sets);
697 table->flags = flags;
699 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
700 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
703 module_put(afi->owner);
706 list_add_tail_rcu(&table->list, &afi->tables);
710 static int nft_flush_table(struct nft_ctx *ctx)
713 struct nft_chain *chain, *nc;
714 struct nft_set *set, *ns;
716 list_for_each_entry(chain, &ctx->table->chains, list) {
719 err = nft_delrule_by_chain(ctx);
724 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
725 if (set->flags & NFT_SET_ANONYMOUS &&
726 !list_empty(&set->bindings))
729 err = nft_delset(ctx, set);
734 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
737 err = nft_delchain(ctx);
742 err = nft_deltable(ctx);
747 static int nft_flush(struct nft_ctx *ctx, int family)
749 struct nft_af_info *afi;
750 struct nft_table *table, *nt;
751 const struct nlattr * const *nla = ctx->nla;
754 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
755 if (family != AF_UNSPEC && afi->family != family)
759 list_for_each_entry_safe(table, nt, &afi->tables, list) {
760 if (nla[NFTA_TABLE_NAME] &&
761 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
766 err = nft_flush_table(ctx);
775 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
776 const struct nlmsghdr *nlh,
777 const struct nlattr * const nla[])
779 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
780 struct nft_af_info *afi;
781 struct nft_table *table;
782 struct net *net = sock_net(skb->sk);
783 int family = nfmsg->nfgen_family;
786 nft_ctx_init(&ctx, skb, nlh, NULL, NULL, NULL, nla);
787 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
788 return nft_flush(&ctx, family);
790 afi = nf_tables_afinfo_lookup(net, family, false);
794 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
796 return PTR_ERR(table);
797 if (table->flags & NFT_TABLE_INACTIVE)
803 return nft_flush_table(&ctx);
806 static void nf_tables_table_destroy(struct nft_ctx *ctx)
808 BUG_ON(ctx->table->use > 0);
811 module_put(ctx->afi->owner);
814 int nft_register_chain_type(const struct nf_chain_type *ctype)
818 nfnl_lock(NFNL_SUBSYS_NFTABLES);
819 if (chain_type[ctype->family][ctype->type] != NULL) {
823 chain_type[ctype->family][ctype->type] = ctype;
825 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
828 EXPORT_SYMBOL_GPL(nft_register_chain_type);
830 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
832 nfnl_lock(NFNL_SUBSYS_NFTABLES);
833 chain_type[ctype->family][ctype->type] = NULL;
834 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
836 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
842 static struct nft_chain *
843 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
845 struct nft_chain *chain;
847 list_for_each_entry(chain, &table->chains, list) {
848 if (chain->handle == handle)
852 return ERR_PTR(-ENOENT);
855 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
856 const struct nlattr *nla)
858 struct nft_chain *chain;
861 return ERR_PTR(-EINVAL);
863 list_for_each_entry(chain, &table->chains, list) {
864 if (!nla_strcmp(nla, chain->name))
868 return ERR_PTR(-ENOENT);
871 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
872 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
873 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
874 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
875 .len = NFT_CHAIN_MAXNAMELEN - 1 },
876 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
877 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
878 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
879 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
882 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
883 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
884 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
887 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
889 struct nft_stats *cpu_stats, total;
895 memset(&total, 0, sizeof(total));
896 for_each_possible_cpu(cpu) {
897 cpu_stats = per_cpu_ptr(stats, cpu);
899 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
900 pkts = cpu_stats->pkts;
901 bytes = cpu_stats->bytes;
902 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
904 total.bytes += bytes;
906 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
908 goto nla_put_failure;
910 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
911 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
912 goto nla_put_failure;
914 nla_nest_end(skb, nest);
921 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
922 u32 portid, u32 seq, int event, u32 flags,
923 int family, const struct nft_table *table,
924 const struct nft_chain *chain)
926 struct nlmsghdr *nlh;
927 struct nfgenmsg *nfmsg;
929 event |= NFNL_SUBSYS_NFTABLES << 8;
930 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
932 goto nla_put_failure;
934 nfmsg = nlmsg_data(nlh);
935 nfmsg->nfgen_family = family;
936 nfmsg->version = NFNETLINK_V0;
937 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
939 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
940 goto nla_put_failure;
941 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
942 goto nla_put_failure;
943 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
944 goto nla_put_failure;
946 if (chain->flags & NFT_BASE_CHAIN) {
947 const struct nft_base_chain *basechain = nft_base_chain(chain);
948 const struct nf_hook_ops *ops = &basechain->ops[0];
951 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
953 goto nla_put_failure;
954 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
955 goto nla_put_failure;
956 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
957 goto nla_put_failure;
958 nla_nest_end(skb, nest);
960 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
961 htonl(basechain->policy)))
962 goto nla_put_failure;
964 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
965 goto nla_put_failure;
967 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
968 goto nla_put_failure;
971 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
972 goto nla_put_failure;
974 return nlmsg_end(skb, nlh);
977 nlmsg_trim(skb, nlh);
981 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
987 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
991 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
995 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
996 event, 0, ctx->afi->family, ctx->table,
1003 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1004 ctx->report, GFP_KERNEL);
1007 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1013 static int nf_tables_dump_chains(struct sk_buff *skb,
1014 struct netlink_callback *cb)
1016 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1017 const struct nft_af_info *afi;
1018 const struct nft_table *table;
1019 const struct nft_chain *chain;
1020 unsigned int idx = 0, s_idx = cb->args[0];
1021 struct net *net = sock_net(skb->sk);
1022 int family = nfmsg->nfgen_family;
1025 cb->seq = net->nft.base_seq;
1027 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1028 if (family != NFPROTO_UNSPEC && family != afi->family)
1031 list_for_each_entry_rcu(table, &afi->tables, list) {
1032 list_for_each_entry_rcu(chain, &table->chains, list) {
1036 memset(&cb->args[1], 0,
1037 sizeof(cb->args) - sizeof(cb->args[0]));
1038 if (nf_tables_fill_chain_info(skb, net,
1039 NETLINK_CB(cb->skb).portid,
1043 afi->family, table, chain) < 0)
1046 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1058 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
1059 const struct nlmsghdr *nlh,
1060 const struct nlattr * const nla[])
1062 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1063 const struct nft_af_info *afi;
1064 const struct nft_table *table;
1065 const struct nft_chain *chain;
1066 struct sk_buff *skb2;
1067 struct net *net = sock_net(skb->sk);
1068 int family = nfmsg->nfgen_family;
1071 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1072 struct netlink_dump_control c = {
1073 .dump = nf_tables_dump_chains,
1075 return netlink_dump_start(nlsk, skb, nlh, &c);
1078 afi = nf_tables_afinfo_lookup(net, family, false);
1080 return PTR_ERR(afi);
1082 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1084 return PTR_ERR(table);
1085 if (table->flags & NFT_TABLE_INACTIVE)
1088 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1090 return PTR_ERR(chain);
1091 if (chain->flags & NFT_CHAIN_INACTIVE)
1094 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1098 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1099 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1100 family, table, chain);
1104 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1111 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1112 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1113 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1116 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1118 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1119 struct nft_stats __percpu *newstats;
1120 struct nft_stats *stats;
1123 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1125 return ERR_PTR(err);
1127 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1128 return ERR_PTR(-EINVAL);
1130 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1131 if (newstats == NULL)
1132 return ERR_PTR(-ENOMEM);
1134 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1135 * are not exposed to userspace.
1138 stats = this_cpu_ptr(newstats);
1139 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1140 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1146 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1147 struct nft_stats __percpu *newstats)
1149 if (newstats == NULL)
1153 struct nft_stats __percpu *oldstats =
1154 nft_dereference(chain->stats);
1156 rcu_assign_pointer(chain->stats, newstats);
1158 free_percpu(oldstats);
1160 rcu_assign_pointer(chain->stats, newstats);
1163 static void nf_tables_chain_destroy(struct nft_chain *chain)
1165 BUG_ON(chain->use > 0);
1167 if (chain->flags & NFT_BASE_CHAIN) {
1168 module_put(nft_base_chain(chain)->type->owner);
1169 free_percpu(nft_base_chain(chain)->stats);
1170 kfree(nft_base_chain(chain));
1176 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
1177 const struct nlmsghdr *nlh,
1178 const struct nlattr * const nla[])
1180 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1181 const struct nlattr * uninitialized_var(name);
1182 struct nft_af_info *afi;
1183 struct nft_table *table;
1184 struct nft_chain *chain;
1185 struct nft_base_chain *basechain = NULL;
1186 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1187 struct net *net = sock_net(skb->sk);
1188 int family = nfmsg->nfgen_family;
1189 u8 policy = NF_ACCEPT;
1192 struct nft_stats __percpu *stats;
1197 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1199 afi = nf_tables_afinfo_lookup(net, family, true);
1201 return PTR_ERR(afi);
1203 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1205 return PTR_ERR(table);
1208 name = nla[NFTA_CHAIN_NAME];
1210 if (nla[NFTA_CHAIN_HANDLE]) {
1211 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1212 chain = nf_tables_chain_lookup_byhandle(table, handle);
1214 return PTR_ERR(chain);
1216 chain = nf_tables_chain_lookup(table, name);
1217 if (IS_ERR(chain)) {
1218 if (PTR_ERR(chain) != -ENOENT)
1219 return PTR_ERR(chain);
1224 if (nla[NFTA_CHAIN_POLICY]) {
1225 if ((chain != NULL &&
1226 !(chain->flags & NFT_BASE_CHAIN)) ||
1227 nla[NFTA_CHAIN_HOOK] == NULL)
1230 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1240 if (chain != NULL) {
1241 struct nft_stats *stats = NULL;
1242 struct nft_trans *trans;
1244 if (chain->flags & NFT_CHAIN_INACTIVE)
1246 if (nlh->nlmsg_flags & NLM_F_EXCL)
1248 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1251 if (nla[NFTA_CHAIN_HANDLE] && name &&
1252 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1255 if (nla[NFTA_CHAIN_COUNTERS]) {
1256 if (!(chain->flags & NFT_BASE_CHAIN))
1259 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1261 return PTR_ERR(stats);
1264 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1265 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1266 sizeof(struct nft_trans_chain));
1267 if (trans == NULL) {
1272 nft_trans_chain_stats(trans) = stats;
1273 nft_trans_chain_update(trans) = true;
1275 if (nla[NFTA_CHAIN_POLICY])
1276 nft_trans_chain_policy(trans) = policy;
1278 nft_trans_chain_policy(trans) = -1;
1280 if (nla[NFTA_CHAIN_HANDLE] && name) {
1281 nla_strlcpy(nft_trans_chain_name(trans), name,
1282 NFT_CHAIN_MAXNAMELEN);
1284 list_add_tail(&trans->list, &net->nft.commit_list);
1288 if (table->use == UINT_MAX)
1291 if (nla[NFTA_CHAIN_HOOK]) {
1292 const struct nf_chain_type *type;
1293 struct nf_hook_ops *ops;
1295 u32 hooknum, priority;
1297 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1298 if (nla[NFTA_CHAIN_TYPE]) {
1299 type = nf_tables_chain_type_lookup(afi,
1300 nla[NFTA_CHAIN_TYPE],
1303 return PTR_ERR(type);
1306 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1310 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1311 ha[NFTA_HOOK_PRIORITY] == NULL)
1314 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1315 if (hooknum >= afi->nhooks)
1317 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1319 if (!(type->hook_mask & (1 << hooknum)))
1321 if (!try_module_get(type->owner))
1323 hookfn = type->hooks[hooknum];
1325 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1326 if (basechain == NULL) {
1327 module_put(type->owner);
1331 if (nla[NFTA_CHAIN_COUNTERS]) {
1332 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1333 if (IS_ERR(stats)) {
1334 module_put(type->owner);
1336 return PTR_ERR(stats);
1338 basechain->stats = stats;
1340 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1341 if (stats == NULL) {
1342 module_put(type->owner);
1346 rcu_assign_pointer(basechain->stats, stats);
1349 basechain->type = type;
1350 chain = &basechain->chain;
1352 for (i = 0; i < afi->nops; i++) {
1353 ops = &basechain->ops[i];
1355 ops->owner = afi->owner;
1356 ops->hooknum = hooknum;
1357 ops->priority = priority;
1359 ops->hook = afi->hooks[ops->hooknum];
1362 if (afi->hook_ops_init)
1363 afi->hook_ops_init(ops, i);
1366 chain->flags |= NFT_BASE_CHAIN;
1367 basechain->policy = policy;
1369 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1374 INIT_LIST_HEAD(&chain->rules);
1375 chain->handle = nf_tables_alloc_handle(table);
1377 chain->table = table;
1378 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1380 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1381 chain->flags & NFT_BASE_CHAIN) {
1382 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1387 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1388 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1393 list_add_tail_rcu(&chain->list, &table->chains);
1396 nf_tables_unregister_hooks(table, chain, afi->nops);
1398 nf_tables_chain_destroy(chain);
1402 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1403 const struct nlmsghdr *nlh,
1404 const struct nlattr * const nla[])
1406 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1407 struct nft_af_info *afi;
1408 struct nft_table *table;
1409 struct nft_chain *chain;
1410 struct net *net = sock_net(skb->sk);
1411 int family = nfmsg->nfgen_family;
1414 afi = nf_tables_afinfo_lookup(net, family, false);
1416 return PTR_ERR(afi);
1418 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1420 return PTR_ERR(table);
1421 if (table->flags & NFT_TABLE_INACTIVE)
1424 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1426 return PTR_ERR(chain);
1427 if (chain->flags & NFT_CHAIN_INACTIVE)
1432 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1434 return nft_delchain(&ctx);
1442 * nft_register_expr - register nf_tables expr type
1445 * Registers the expr type for use with nf_tables. Returns zero on
1446 * success or a negative errno code otherwise.
1448 int nft_register_expr(struct nft_expr_type *type)
1450 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1451 if (type->family == NFPROTO_UNSPEC)
1452 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1454 list_add_rcu(&type->list, &nf_tables_expressions);
1455 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1458 EXPORT_SYMBOL_GPL(nft_register_expr);
1461 * nft_unregister_expr - unregister nf_tables expr type
1464 * Unregisters the expr typefor use with nf_tables.
1466 void nft_unregister_expr(struct nft_expr_type *type)
1468 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1469 list_del_rcu(&type->list);
1470 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1472 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1474 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1477 const struct nft_expr_type *type;
1479 list_for_each_entry(type, &nf_tables_expressions, list) {
1480 if (!nla_strcmp(nla, type->name) &&
1481 (!type->family || type->family == family))
1487 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1490 const struct nft_expr_type *type;
1493 return ERR_PTR(-EINVAL);
1495 type = __nft_expr_type_get(family, nla);
1496 if (type != NULL && try_module_get(type->owner))
1499 #ifdef CONFIG_MODULES
1501 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1502 request_module("nft-expr-%u-%.*s", family,
1503 nla_len(nla), (char *)nla_data(nla));
1504 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1505 if (__nft_expr_type_get(family, nla))
1506 return ERR_PTR(-EAGAIN);
1508 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1509 request_module("nft-expr-%.*s",
1510 nla_len(nla), (char *)nla_data(nla));
1511 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1512 if (__nft_expr_type_get(family, nla))
1513 return ERR_PTR(-EAGAIN);
1516 return ERR_PTR(-ENOENT);
1519 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1520 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1521 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1524 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1525 const struct nft_expr *expr)
1527 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1528 goto nla_put_failure;
1530 if (expr->ops->dump) {
1531 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1533 goto nla_put_failure;
1534 if (expr->ops->dump(skb, expr) < 0)
1535 goto nla_put_failure;
1536 nla_nest_end(skb, data);
1545 struct nft_expr_info {
1546 const struct nft_expr_ops *ops;
1547 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1550 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1551 const struct nlattr *nla,
1552 struct nft_expr_info *info)
1554 const struct nft_expr_type *type;
1555 const struct nft_expr_ops *ops;
1556 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1559 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1563 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1565 return PTR_ERR(type);
1567 if (tb[NFTA_EXPR_DATA]) {
1568 err = nla_parse_nested(info->tb, type->maxattr,
1569 tb[NFTA_EXPR_DATA], type->policy);
1573 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1575 if (type->select_ops != NULL) {
1576 ops = type->select_ops(ctx,
1577 (const struct nlattr * const *)info->tb);
1589 module_put(type->owner);
1593 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1594 const struct nft_expr_info *info,
1595 struct nft_expr *expr)
1597 const struct nft_expr_ops *ops = info->ops;
1602 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1614 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1615 struct nft_expr *expr)
1617 if (expr->ops->destroy)
1618 expr->ops->destroy(ctx, expr);
1619 module_put(expr->ops->type->owner);
1626 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1629 struct nft_rule *rule;
1631 // FIXME: this sucks
1632 list_for_each_entry(rule, &chain->rules, list) {
1633 if (handle == rule->handle)
1637 return ERR_PTR(-ENOENT);
1640 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1641 const struct nlattr *nla)
1644 return ERR_PTR(-EINVAL);
1646 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1649 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1650 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1651 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1652 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1653 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1654 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1655 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1656 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1657 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1658 .len = NFT_USERDATA_MAXLEN },
1661 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1662 u32 portid, u32 seq, int event,
1663 u32 flags, int family,
1664 const struct nft_table *table,
1665 const struct nft_chain *chain,
1666 const struct nft_rule *rule)
1668 struct nlmsghdr *nlh;
1669 struct nfgenmsg *nfmsg;
1670 const struct nft_expr *expr, *next;
1671 struct nlattr *list;
1672 const struct nft_rule *prule;
1673 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1675 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1678 goto nla_put_failure;
1680 nfmsg = nlmsg_data(nlh);
1681 nfmsg->nfgen_family = family;
1682 nfmsg->version = NFNETLINK_V0;
1683 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1685 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1686 goto nla_put_failure;
1687 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1688 goto nla_put_failure;
1689 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1690 goto nla_put_failure;
1692 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1693 prule = list_entry(rule->list.prev, struct nft_rule, list);
1694 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1695 cpu_to_be64(prule->handle)))
1696 goto nla_put_failure;
1699 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1701 goto nla_put_failure;
1702 nft_rule_for_each_expr(expr, next, rule) {
1703 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1705 goto nla_put_failure;
1706 if (nf_tables_fill_expr_info(skb, expr) < 0)
1707 goto nla_put_failure;
1708 nla_nest_end(skb, elem);
1710 nla_nest_end(skb, list);
1713 nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule)))
1714 goto nla_put_failure;
1716 return nlmsg_end(skb, nlh);
1719 nlmsg_trim(skb, nlh);
1723 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1724 const struct nft_rule *rule,
1727 struct sk_buff *skb;
1731 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1735 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1739 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1740 event, 0, ctx->afi->family, ctx->table,
1747 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1748 ctx->report, GFP_KERNEL);
1751 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1757 static int nf_tables_dump_rules(struct sk_buff *skb,
1758 struct netlink_callback *cb)
1760 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1761 const struct nft_af_info *afi;
1762 const struct nft_table *table;
1763 const struct nft_chain *chain;
1764 const struct nft_rule *rule;
1765 unsigned int idx = 0, s_idx = cb->args[0];
1766 struct net *net = sock_net(skb->sk);
1767 int family = nfmsg->nfgen_family;
1770 cb->seq = net->nft.base_seq;
1772 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1773 if (family != NFPROTO_UNSPEC && family != afi->family)
1776 list_for_each_entry_rcu(table, &afi->tables, list) {
1777 list_for_each_entry_rcu(chain, &table->chains, list) {
1778 list_for_each_entry_rcu(rule, &chain->rules, list) {
1779 if (!nft_rule_is_active(net, rule))
1784 memset(&cb->args[1], 0,
1785 sizeof(cb->args) - sizeof(cb->args[0]));
1786 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1789 NLM_F_MULTI | NLM_F_APPEND,
1790 afi->family, table, chain, rule) < 0)
1793 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1807 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1808 const struct nlmsghdr *nlh,
1809 const struct nlattr * const nla[])
1811 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1812 const struct nft_af_info *afi;
1813 const struct nft_table *table;
1814 const struct nft_chain *chain;
1815 const struct nft_rule *rule;
1816 struct sk_buff *skb2;
1817 struct net *net = sock_net(skb->sk);
1818 int family = nfmsg->nfgen_family;
1821 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1822 struct netlink_dump_control c = {
1823 .dump = nf_tables_dump_rules,
1825 return netlink_dump_start(nlsk, skb, nlh, &c);
1828 afi = nf_tables_afinfo_lookup(net, family, false);
1830 return PTR_ERR(afi);
1832 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1834 return PTR_ERR(table);
1835 if (table->flags & NFT_TABLE_INACTIVE)
1838 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1840 return PTR_ERR(chain);
1841 if (chain->flags & NFT_CHAIN_INACTIVE)
1844 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1846 return PTR_ERR(rule);
1848 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1852 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1853 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1854 family, table, chain, rule);
1858 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1865 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1866 struct nft_rule *rule)
1868 struct nft_expr *expr;
1871 * Careful: some expressions might not be initialized in case this
1872 * is called on error from nf_tables_newrule().
1874 expr = nft_expr_first(rule);
1875 while (expr->ops && expr != nft_expr_last(rule)) {
1876 nf_tables_expr_destroy(ctx, expr);
1877 expr = nft_expr_next(expr);
1882 #define NFT_RULE_MAXEXPRS 128
1884 static struct nft_expr_info *info;
1886 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1887 const struct nlmsghdr *nlh,
1888 const struct nlattr * const nla[])
1890 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1891 struct nft_af_info *afi;
1892 struct net *net = sock_net(skb->sk);
1893 struct nft_table *table;
1894 struct nft_chain *chain;
1895 struct nft_rule *rule, *old_rule = NULL;
1896 struct nft_trans *trans = NULL;
1897 struct nft_expr *expr;
1900 unsigned int size, i, n, ulen = 0;
1903 u64 handle, pos_handle;
1905 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1907 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1909 return PTR_ERR(afi);
1911 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1913 return PTR_ERR(table);
1915 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1917 return PTR_ERR(chain);
1919 if (nla[NFTA_RULE_HANDLE]) {
1920 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1921 rule = __nf_tables_rule_lookup(chain, handle);
1923 return PTR_ERR(rule);
1925 if (nlh->nlmsg_flags & NLM_F_EXCL)
1927 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1932 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1934 handle = nf_tables_alloc_handle(table);
1936 if (chain->use == UINT_MAX)
1940 if (nla[NFTA_RULE_POSITION]) {
1941 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1944 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1945 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1946 if (IS_ERR(old_rule))
1947 return PTR_ERR(old_rule);
1950 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1954 if (nla[NFTA_RULE_EXPRESSIONS]) {
1955 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1957 if (nla_type(tmp) != NFTA_LIST_ELEM)
1959 if (n == NFT_RULE_MAXEXPRS)
1961 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1964 size += info[n].ops->size;
1969 if (nla[NFTA_RULE_USERDATA])
1970 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
1973 rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL);
1977 nft_rule_activate_next(net, rule);
1979 rule->handle = handle;
1984 nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen);
1986 expr = nft_expr_first(rule);
1987 for (i = 0; i < n; i++) {
1988 err = nf_tables_newexpr(&ctx, &info[i], expr);
1992 expr = nft_expr_next(expr);
1995 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
1996 if (nft_rule_is_active_next(net, old_rule)) {
1997 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
1999 if (trans == NULL) {
2003 nft_rule_deactivate_next(net, old_rule);
2005 list_add_tail_rcu(&rule->list, &old_rule->list);
2010 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2012 list_add_rcu(&rule->list, &old_rule->list);
2014 list_add_tail_rcu(&rule->list, &chain->rules);
2017 list_add_tail_rcu(&rule->list, &old_rule->list);
2019 list_add_rcu(&rule->list, &chain->rules);
2022 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2030 list_del_rcu(&rule->list);
2032 list_del_rcu(&nft_trans_rule(trans)->list);
2033 nft_rule_clear(net, nft_trans_rule(trans));
2034 nft_trans_destroy(trans);
2038 nf_tables_rule_destroy(&ctx, rule);
2040 for (i = 0; i < n; i++) {
2041 if (info[i].ops != NULL)
2042 module_put(info[i].ops->type->owner);
2047 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
2048 const struct nlmsghdr *nlh,
2049 const struct nlattr * const nla[])
2051 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2052 struct nft_af_info *afi;
2053 struct net *net = sock_net(skb->sk);
2054 struct nft_table *table;
2055 struct nft_chain *chain = NULL;
2056 struct nft_rule *rule;
2057 int family = nfmsg->nfgen_family, err = 0;
2060 afi = nf_tables_afinfo_lookup(net, family, false);
2062 return PTR_ERR(afi);
2064 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2066 return PTR_ERR(table);
2067 if (table->flags & NFT_TABLE_INACTIVE)
2070 if (nla[NFTA_RULE_CHAIN]) {
2071 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2073 return PTR_ERR(chain);
2076 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
2079 if (nla[NFTA_RULE_HANDLE]) {
2080 rule = nf_tables_rule_lookup(chain,
2081 nla[NFTA_RULE_HANDLE]);
2083 return PTR_ERR(rule);
2085 err = nft_delrule(&ctx, rule);
2087 err = nft_delrule_by_chain(&ctx);
2090 list_for_each_entry(chain, &table->chains, list) {
2092 err = nft_delrule_by_chain(&ctx);
2105 static LIST_HEAD(nf_tables_set_ops);
2107 int nft_register_set(struct nft_set_ops *ops)
2109 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2110 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2111 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2114 EXPORT_SYMBOL_GPL(nft_register_set);
2116 void nft_unregister_set(struct nft_set_ops *ops)
2118 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2119 list_del_rcu(&ops->list);
2120 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2122 EXPORT_SYMBOL_GPL(nft_unregister_set);
2125 * Select a set implementation based on the data characteristics and the
2126 * given policy. The total memory use might not be known if no size is
2127 * given, in that case the amount of memory per element is used.
2129 static const struct nft_set_ops *
2130 nft_select_set_ops(const struct nlattr * const nla[],
2131 const struct nft_set_desc *desc,
2132 enum nft_set_policies policy)
2134 const struct nft_set_ops *ops, *bops;
2135 struct nft_set_estimate est, best;
2138 #ifdef CONFIG_MODULES
2139 if (list_empty(&nf_tables_set_ops)) {
2140 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2141 request_module("nft-set");
2142 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2143 if (!list_empty(&nf_tables_set_ops))
2144 return ERR_PTR(-EAGAIN);
2148 if (nla[NFTA_SET_FLAGS] != NULL) {
2149 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2150 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
2157 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2158 if ((ops->features & features) != features)
2160 if (!ops->estimate(desc, features, &est))
2164 case NFT_SET_POL_PERFORMANCE:
2165 if (est.class < best.class)
2167 if (est.class == best.class && est.size < best.size)
2170 case NFT_SET_POL_MEMORY:
2171 if (est.size < best.size)
2173 if (est.size == best.size && est.class < best.class)
2180 if (!try_module_get(ops->owner))
2183 module_put(bops->owner);
2192 return ERR_PTR(-EOPNOTSUPP);
2195 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2196 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2197 [NFTA_SET_NAME] = { .type = NLA_STRING,
2198 .len = IFNAMSIZ - 1 },
2199 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2200 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2201 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2202 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2203 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2204 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2205 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2206 [NFTA_SET_ID] = { .type = NLA_U32 },
2209 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2210 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2213 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2214 const struct sk_buff *skb,
2215 const struct nlmsghdr *nlh,
2216 const struct nlattr * const nla[])
2218 struct net *net = sock_net(skb->sk);
2219 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2220 struct nft_af_info *afi = NULL;
2221 struct nft_table *table = NULL;
2223 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2224 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2226 return PTR_ERR(afi);
2229 if (nla[NFTA_SET_TABLE] != NULL) {
2231 return -EAFNOSUPPORT;
2233 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2235 return PTR_ERR(table);
2236 if (table->flags & NFT_TABLE_INACTIVE)
2240 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2244 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2245 const struct nlattr *nla)
2247 struct nft_set *set;
2250 return ERR_PTR(-EINVAL);
2252 list_for_each_entry(set, &table->sets, list) {
2253 if (!nla_strcmp(nla, set->name))
2256 return ERR_PTR(-ENOENT);
2259 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2260 const struct nlattr *nla)
2262 struct nft_trans *trans;
2263 u32 id = ntohl(nla_get_be32(nla));
2265 list_for_each_entry(trans, &net->nft.commit_list, list) {
2266 if (trans->msg_type == NFT_MSG_NEWSET &&
2267 id == nft_trans_set_id(trans))
2268 return nft_trans_set(trans);
2270 return ERR_PTR(-ENOENT);
2273 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2276 const struct nft_set *i;
2278 unsigned long *inuse;
2279 unsigned int n = 0, min = 0;
2281 p = strnchr(name, IFNAMSIZ, '%');
2283 if (p[1] != 'd' || strchr(p + 2, '%'))
2286 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2290 list_for_each_entry(i, &ctx->table->sets, list) {
2293 if (!sscanf(i->name, name, &tmp))
2295 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2298 set_bit(tmp - min, inuse);
2301 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2302 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2303 min += BITS_PER_BYTE * PAGE_SIZE;
2304 memset(inuse, 0, PAGE_SIZE);
2307 free_page((unsigned long)inuse);
2310 snprintf(set->name, sizeof(set->name), name, min + n);
2311 list_for_each_entry(i, &ctx->table->sets, list) {
2312 if (!strcmp(set->name, i->name))
2318 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2319 const struct nft_set *set, u16 event, u16 flags)
2321 struct nfgenmsg *nfmsg;
2322 struct nlmsghdr *nlh;
2323 struct nlattr *desc;
2324 u32 portid = ctx->portid;
2327 event |= NFNL_SUBSYS_NFTABLES << 8;
2328 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2331 goto nla_put_failure;
2333 nfmsg = nlmsg_data(nlh);
2334 nfmsg->nfgen_family = ctx->afi->family;
2335 nfmsg->version = NFNETLINK_V0;
2336 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2338 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2339 goto nla_put_failure;
2340 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2341 goto nla_put_failure;
2342 if (set->flags != 0)
2343 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2344 goto nla_put_failure;
2346 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2347 goto nla_put_failure;
2348 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2349 goto nla_put_failure;
2350 if (set->flags & NFT_SET_MAP) {
2351 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2352 goto nla_put_failure;
2353 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2354 goto nla_put_failure;
2357 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2358 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2359 goto nla_put_failure;
2362 desc = nla_nest_start(skb, NFTA_SET_DESC);
2364 goto nla_put_failure;
2366 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2367 goto nla_put_failure;
2368 nla_nest_end(skb, desc);
2370 return nlmsg_end(skb, nlh);
2373 nlmsg_trim(skb, nlh);
2377 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2378 const struct nft_set *set,
2379 int event, gfp_t gfp_flags)
2381 struct sk_buff *skb;
2382 u32 portid = ctx->portid;
2386 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2390 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2394 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2400 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2401 ctx->report, gfp_flags);
2404 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2408 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2410 const struct nft_set *set;
2411 unsigned int idx, s_idx = cb->args[0];
2412 struct nft_af_info *afi;
2413 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2414 struct net *net = sock_net(skb->sk);
2415 int cur_family = cb->args[3];
2416 struct nft_ctx *ctx = cb->data, ctx_set;
2422 cb->seq = net->nft.base_seq;
2424 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2425 if (ctx->afi && ctx->afi != afi)
2429 if (afi->family != cur_family)
2434 list_for_each_entry_rcu(table, &afi->tables, list) {
2435 if (ctx->table && ctx->table != table)
2439 if (cur_table != table)
2445 list_for_each_entry_rcu(set, &table->sets, list) {
2450 ctx_set.table = table;
2452 if (nf_tables_fill_set(skb, &ctx_set, set,
2456 cb->args[2] = (unsigned long) table;
2457 cb->args[3] = afi->family;
2460 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2474 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2480 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2481 const struct nlmsghdr *nlh,
2482 const struct nlattr * const nla[])
2484 const struct nft_set *set;
2486 struct sk_buff *skb2;
2487 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2490 /* Verify existence before starting dump */
2491 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2495 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2496 struct netlink_dump_control c = {
2497 .dump = nf_tables_dump_sets,
2498 .done = nf_tables_dump_sets_done,
2500 struct nft_ctx *ctx_dump;
2502 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2503 if (ctx_dump == NULL)
2509 return netlink_dump_start(nlsk, skb, nlh, &c);
2512 /* Only accept unspec with dump */
2513 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2514 return -EAFNOSUPPORT;
2516 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2518 return PTR_ERR(set);
2519 if (set->flags & NFT_SET_INACTIVE)
2522 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2526 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2530 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2537 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2538 struct nft_set_desc *desc,
2539 const struct nlattr *nla)
2541 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2544 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2548 if (da[NFTA_SET_DESC_SIZE] != NULL)
2549 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2554 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2555 const struct nlmsghdr *nlh,
2556 const struct nlattr * const nla[])
2558 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2559 const struct nft_set_ops *ops;
2560 struct nft_af_info *afi;
2561 struct net *net = sock_net(skb->sk);
2562 struct nft_table *table;
2563 struct nft_set *set;
2565 char name[IFNAMSIZ];
2568 u32 ktype, dtype, flags, policy;
2569 struct nft_set_desc desc;
2572 if (nla[NFTA_SET_TABLE] == NULL ||
2573 nla[NFTA_SET_NAME] == NULL ||
2574 nla[NFTA_SET_KEY_LEN] == NULL ||
2575 nla[NFTA_SET_ID] == NULL)
2578 memset(&desc, 0, sizeof(desc));
2580 ktype = NFT_DATA_VALUE;
2581 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2582 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2583 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2587 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2588 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2592 if (nla[NFTA_SET_FLAGS] != NULL) {
2593 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2594 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2595 NFT_SET_INTERVAL | NFT_SET_MAP))
2600 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2601 if (!(flags & NFT_SET_MAP))
2604 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2605 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2606 dtype != NFT_DATA_VERDICT)
2609 if (dtype != NFT_DATA_VERDICT) {
2610 if (nla[NFTA_SET_DATA_LEN] == NULL)
2612 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2613 if (desc.dlen == 0 ||
2614 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2617 desc.dlen = sizeof(struct nft_data);
2618 } else if (flags & NFT_SET_MAP)
2621 policy = NFT_SET_POL_PERFORMANCE;
2622 if (nla[NFTA_SET_POLICY] != NULL)
2623 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2625 if (nla[NFTA_SET_DESC] != NULL) {
2626 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2631 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2633 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2635 return PTR_ERR(afi);
2637 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2639 return PTR_ERR(table);
2641 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2643 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2645 if (PTR_ERR(set) != -ENOENT)
2646 return PTR_ERR(set);
2651 if (nlh->nlmsg_flags & NLM_F_EXCL)
2653 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2658 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2661 ops = nft_select_set_ops(nla, &desc, policy);
2663 return PTR_ERR(ops);
2666 if (ops->privsize != NULL)
2667 size = ops->privsize(nla);
2670 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2674 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2675 err = nf_tables_set_alloc_name(&ctx, set, name);
2679 INIT_LIST_HEAD(&set->bindings);
2682 set->klen = desc.klen;
2684 set->dlen = desc.dlen;
2686 set->size = desc.size;
2687 set->policy = policy;
2689 err = ops->init(set, &desc, nla);
2693 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2697 list_add_tail_rcu(&set->list, &table->sets);
2704 module_put(ops->owner);
2708 static void nft_set_destroy(struct nft_set *set)
2710 set->ops->destroy(set);
2711 module_put(set->ops->owner);
2715 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2717 list_del_rcu(&set->list);
2718 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2719 nft_set_destroy(set);
2722 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2723 const struct nlmsghdr *nlh,
2724 const struct nlattr * const nla[])
2726 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2727 struct nft_set *set;
2731 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2732 return -EAFNOSUPPORT;
2733 if (nla[NFTA_SET_TABLE] == NULL)
2736 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2740 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2742 return PTR_ERR(set);
2743 if (set->flags & NFT_SET_INACTIVE)
2745 if (!list_empty(&set->bindings))
2748 return nft_delset(&ctx, set);
2751 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2752 const struct nft_set *set,
2753 const struct nft_set_iter *iter,
2754 const struct nft_set_elem *elem)
2756 enum nft_registers dreg;
2758 dreg = nft_type_to_reg(set->dtype);
2759 return nft_validate_data_load(ctx, dreg, &elem->data,
2760 set->dtype == NFT_DATA_VERDICT ?
2761 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2764 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2765 struct nft_set_binding *binding)
2767 struct nft_set_binding *i;
2768 struct nft_set_iter iter;
2770 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2773 if (set->flags & NFT_SET_MAP) {
2774 /* If the set is already bound to the same chain all
2775 * jumps are already validated for that chain.
2777 list_for_each_entry(i, &set->bindings, list) {
2778 if (i->chain == binding->chain)
2785 iter.fn = nf_tables_bind_check_setelem;
2787 set->ops->walk(ctx, set, &iter);
2789 /* Destroy anonymous sets if binding fails */
2790 if (set->flags & NFT_SET_ANONYMOUS)
2791 nf_tables_set_destroy(ctx, set);
2797 binding->chain = ctx->chain;
2798 list_add_tail_rcu(&binding->list, &set->bindings);
2802 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2803 struct nft_set_binding *binding)
2805 list_del_rcu(&binding->list);
2807 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2808 !(set->flags & NFT_SET_INACTIVE))
2809 nf_tables_set_destroy(ctx, set);
2816 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2817 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2818 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2819 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2822 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2823 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2824 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2825 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2826 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2829 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2830 const struct sk_buff *skb,
2831 const struct nlmsghdr *nlh,
2832 const struct nlattr * const nla[],
2835 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2836 struct nft_af_info *afi;
2837 struct nft_table *table;
2838 struct net *net = sock_net(skb->sk);
2840 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2842 return PTR_ERR(afi);
2844 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2846 return PTR_ERR(table);
2847 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2850 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2854 static int nf_tables_fill_setelem(struct sk_buff *skb,
2855 const struct nft_set *set,
2856 const struct nft_set_elem *elem)
2858 unsigned char *b = skb_tail_pointer(skb);
2859 struct nlattr *nest;
2861 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2863 goto nla_put_failure;
2865 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2867 goto nla_put_failure;
2869 if (set->flags & NFT_SET_MAP &&
2870 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2871 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2872 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2874 goto nla_put_failure;
2876 if (elem->flags != 0)
2877 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2878 goto nla_put_failure;
2880 nla_nest_end(skb, nest);
2888 struct nft_set_dump_args {
2889 const struct netlink_callback *cb;
2890 struct nft_set_iter iter;
2891 struct sk_buff *skb;
2894 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2895 const struct nft_set *set,
2896 const struct nft_set_iter *iter,
2897 const struct nft_set_elem *elem)
2899 struct nft_set_dump_args *args;
2901 args = container_of(iter, struct nft_set_dump_args, iter);
2902 return nf_tables_fill_setelem(args->skb, set, elem);
2905 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2907 const struct nft_set *set;
2908 struct nft_set_dump_args args;
2910 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2911 struct nfgenmsg *nfmsg;
2912 struct nlmsghdr *nlh;
2913 struct nlattr *nest;
2917 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2918 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2922 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
2927 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2929 return PTR_ERR(set);
2930 if (set->flags & NFT_SET_INACTIVE)
2933 event = NFT_MSG_NEWSETELEM;
2934 event |= NFNL_SUBSYS_NFTABLES << 8;
2935 portid = NETLINK_CB(cb->skb).portid;
2936 seq = cb->nlh->nlmsg_seq;
2938 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2941 goto nla_put_failure;
2943 nfmsg = nlmsg_data(nlh);
2944 nfmsg->nfgen_family = ctx.afi->family;
2945 nfmsg->version = NFNETLINK_V0;
2946 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
2948 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2949 goto nla_put_failure;
2950 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2951 goto nla_put_failure;
2953 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2955 goto nla_put_failure;
2959 args.iter.skip = cb->args[0];
2960 args.iter.count = 0;
2962 args.iter.fn = nf_tables_dump_setelem;
2963 set->ops->walk(&ctx, set, &args.iter);
2965 nla_nest_end(skb, nest);
2966 nlmsg_end(skb, nlh);
2968 if (args.iter.err && args.iter.err != -EMSGSIZE)
2969 return args.iter.err;
2970 if (args.iter.count == cb->args[0])
2973 cb->args[0] = args.iter.count;
2980 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2981 const struct nlmsghdr *nlh,
2982 const struct nlattr * const nla[])
2984 const struct nft_set *set;
2988 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
2992 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2994 return PTR_ERR(set);
2995 if (set->flags & NFT_SET_INACTIVE)
2998 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2999 struct netlink_dump_control c = {
3000 .dump = nf_tables_dump_set,
3002 return netlink_dump_start(nlsk, skb, nlh, &c);
3007 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3008 const struct nft_ctx *ctx, u32 seq,
3009 u32 portid, int event, u16 flags,
3010 const struct nft_set *set,
3011 const struct nft_set_elem *elem)
3013 struct nfgenmsg *nfmsg;
3014 struct nlmsghdr *nlh;
3015 struct nlattr *nest;
3018 event |= NFNL_SUBSYS_NFTABLES << 8;
3019 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3022 goto nla_put_failure;
3024 nfmsg = nlmsg_data(nlh);
3025 nfmsg->nfgen_family = ctx->afi->family;
3026 nfmsg->version = NFNETLINK_V0;
3027 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3029 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3030 goto nla_put_failure;
3031 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3032 goto nla_put_failure;
3034 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3036 goto nla_put_failure;
3038 err = nf_tables_fill_setelem(skb, set, elem);
3040 goto nla_put_failure;
3042 nla_nest_end(skb, nest);
3044 return nlmsg_end(skb, nlh);
3047 nlmsg_trim(skb, nlh);
3051 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3052 const struct nft_set *set,
3053 const struct nft_set_elem *elem,
3054 int event, u16 flags)
3056 struct net *net = ctx->net;
3057 u32 portid = ctx->portid;
3058 struct sk_buff *skb;
3061 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3065 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3069 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3076 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3080 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3084 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3086 struct nft_set *set)
3088 struct nft_trans *trans;
3090 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3094 nft_trans_elem_set(trans) = set;
3098 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3099 const struct nlattr *attr)
3101 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3102 struct nft_data_desc d1, d2;
3103 struct nft_set_elem elem;
3104 struct nft_set_binding *binding;
3105 enum nft_registers dreg;
3106 struct nft_trans *trans;
3109 if (set->size && set->nelems == set->size)
3112 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3113 nft_set_elem_policy);
3117 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3121 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3122 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3123 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
3127 if (set->flags & NFT_SET_MAP) {
3128 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3129 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
3131 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3132 elem.flags & NFT_SET_ELEM_INTERVAL_END)
3135 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3139 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3143 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3147 if (set->ops->get(set, &elem) == 0)
3150 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3151 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
3156 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3159 dreg = nft_type_to_reg(set->dtype);
3160 list_for_each_entry(binding, &set->bindings, list) {
3161 struct nft_ctx bind_ctx = {
3163 .table = ctx->table,
3164 .chain = (struct nft_chain *)binding->chain,
3167 err = nft_validate_data_load(&bind_ctx, dreg,
3168 &elem.data, d2.type);
3174 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3178 err = set->ops->insert(set, &elem);
3182 nft_trans_elem(trans) = elem;
3183 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3189 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3190 nft_data_uninit(&elem.data, d2.type);
3192 nft_data_uninit(&elem.key, d1.type);
3197 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3198 const struct nlmsghdr *nlh,
3199 const struct nlattr * const nla[])
3201 struct net *net = sock_net(skb->sk);
3202 const struct nlattr *attr;
3203 struct nft_set *set;
3207 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3210 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3214 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3216 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3217 set = nf_tables_set_lookup_byid(net,
3218 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3221 return PTR_ERR(set);
3224 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3227 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3228 err = nft_add_set_elem(&ctx, set, attr);
3237 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3238 const struct nlattr *attr)
3240 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3241 struct nft_data_desc desc;
3242 struct nft_set_elem elem;
3243 struct nft_trans *trans;
3246 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3247 nft_set_elem_policy);
3252 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3255 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3260 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3263 err = set->ops->get(set, &elem);
3267 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3268 if (trans == NULL) {
3273 nft_trans_elem(trans) = elem;
3274 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3277 nft_data_uninit(&elem.key, desc.type);
3282 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3283 const struct nlmsghdr *nlh,
3284 const struct nlattr * const nla[])
3286 const struct nlattr *attr;
3287 struct nft_set *set;
3291 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3294 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3298 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3300 return PTR_ERR(set);
3301 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3304 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3305 err = nft_del_setelem(&ctx, set, attr);
3314 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3315 u32 portid, u32 seq)
3317 struct nlmsghdr *nlh;
3318 struct nfgenmsg *nfmsg;
3319 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3321 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3323 goto nla_put_failure;
3325 nfmsg = nlmsg_data(nlh);
3326 nfmsg->nfgen_family = AF_UNSPEC;
3327 nfmsg->version = NFNETLINK_V0;
3328 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3330 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3331 goto nla_put_failure;
3333 return nlmsg_end(skb, nlh);
3336 nlmsg_trim(skb, nlh);
3340 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3342 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3343 struct sk_buff *skb2;
3346 if (nlmsg_report(nlh) &&
3347 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3351 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3355 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3362 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3363 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3366 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3372 static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb,
3373 const struct nlmsghdr *nlh,
3374 const struct nlattr * const nla[])
3376 struct net *net = sock_net(skb->sk);
3377 struct sk_buff *skb2;
3380 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3384 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3389 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3395 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3396 [NFT_MSG_NEWTABLE] = {
3397 .call_batch = nf_tables_newtable,
3398 .attr_count = NFTA_TABLE_MAX,
3399 .policy = nft_table_policy,
3401 [NFT_MSG_GETTABLE] = {
3402 .call = nf_tables_gettable,
3403 .attr_count = NFTA_TABLE_MAX,
3404 .policy = nft_table_policy,
3406 [NFT_MSG_DELTABLE] = {
3407 .call_batch = nf_tables_deltable,
3408 .attr_count = NFTA_TABLE_MAX,
3409 .policy = nft_table_policy,
3411 [NFT_MSG_NEWCHAIN] = {
3412 .call_batch = nf_tables_newchain,
3413 .attr_count = NFTA_CHAIN_MAX,
3414 .policy = nft_chain_policy,
3416 [NFT_MSG_GETCHAIN] = {
3417 .call = nf_tables_getchain,
3418 .attr_count = NFTA_CHAIN_MAX,
3419 .policy = nft_chain_policy,
3421 [NFT_MSG_DELCHAIN] = {
3422 .call_batch = nf_tables_delchain,
3423 .attr_count = NFTA_CHAIN_MAX,
3424 .policy = nft_chain_policy,
3426 [NFT_MSG_NEWRULE] = {
3427 .call_batch = nf_tables_newrule,
3428 .attr_count = NFTA_RULE_MAX,
3429 .policy = nft_rule_policy,
3431 [NFT_MSG_GETRULE] = {
3432 .call = nf_tables_getrule,
3433 .attr_count = NFTA_RULE_MAX,
3434 .policy = nft_rule_policy,
3436 [NFT_MSG_DELRULE] = {
3437 .call_batch = nf_tables_delrule,
3438 .attr_count = NFTA_RULE_MAX,
3439 .policy = nft_rule_policy,
3441 [NFT_MSG_NEWSET] = {
3442 .call_batch = nf_tables_newset,
3443 .attr_count = NFTA_SET_MAX,
3444 .policy = nft_set_policy,
3446 [NFT_MSG_GETSET] = {
3447 .call = nf_tables_getset,
3448 .attr_count = NFTA_SET_MAX,
3449 .policy = nft_set_policy,
3451 [NFT_MSG_DELSET] = {
3452 .call_batch = nf_tables_delset,
3453 .attr_count = NFTA_SET_MAX,
3454 .policy = nft_set_policy,
3456 [NFT_MSG_NEWSETELEM] = {
3457 .call_batch = nf_tables_newsetelem,
3458 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3459 .policy = nft_set_elem_list_policy,
3461 [NFT_MSG_GETSETELEM] = {
3462 .call = nf_tables_getsetelem,
3463 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3464 .policy = nft_set_elem_list_policy,
3466 [NFT_MSG_DELSETELEM] = {
3467 .call_batch = nf_tables_delsetelem,
3468 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3469 .policy = nft_set_elem_list_policy,
3471 [NFT_MSG_GETGEN] = {
3472 .call = nf_tables_getgen,
3476 static void nft_chain_commit_update(struct nft_trans *trans)
3478 struct nft_base_chain *basechain;
3480 if (nft_trans_chain_name(trans)[0])
3481 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3483 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3486 basechain = nft_base_chain(trans->ctx.chain);
3487 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3489 switch (nft_trans_chain_policy(trans)) {
3492 basechain->policy = nft_trans_chain_policy(trans);
3497 static void nf_tables_commit_release(struct nft_trans *trans)
3499 switch (trans->msg_type) {
3500 case NFT_MSG_DELTABLE:
3501 nf_tables_table_destroy(&trans->ctx);
3503 case NFT_MSG_DELCHAIN:
3504 nf_tables_chain_destroy(trans->ctx.chain);
3506 case NFT_MSG_DELRULE:
3507 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3509 case NFT_MSG_DELSET:
3510 nft_set_destroy(nft_trans_set(trans));
3516 static int nf_tables_commit(struct sk_buff *skb)
3518 struct net *net = sock_net(skb->sk);
3519 struct nft_trans *trans, *next;
3520 struct nft_trans_elem *te;
3522 /* Bump generation counter, invalidate any dump in progress */
3523 while (++net->nft.base_seq == 0);
3525 /* A new generation has just started */
3526 net->nft.gencursor = gencursor_next(net);
3528 /* Make sure all packets have left the previous generation before
3529 * purging old rules.
3533 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3534 switch (trans->msg_type) {
3535 case NFT_MSG_NEWTABLE:
3536 if (nft_trans_table_update(trans)) {
3537 if (!nft_trans_table_enable(trans)) {
3538 nf_tables_table_disable(trans->ctx.afi,
3540 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3543 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3545 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3546 nft_trans_destroy(trans);
3548 case NFT_MSG_DELTABLE:
3549 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3551 case NFT_MSG_NEWCHAIN:
3552 if (nft_trans_chain_update(trans))
3553 nft_chain_commit_update(trans);
3555 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3557 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3558 nft_trans_destroy(trans);
3560 case NFT_MSG_DELCHAIN:
3561 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3562 nf_tables_unregister_hooks(trans->ctx.table,
3564 trans->ctx.afi->nops);
3566 case NFT_MSG_NEWRULE:
3567 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3568 nf_tables_rule_notify(&trans->ctx,
3569 nft_trans_rule(trans),
3571 nft_trans_destroy(trans);
3573 case NFT_MSG_DELRULE:
3574 list_del_rcu(&nft_trans_rule(trans)->list);
3575 nf_tables_rule_notify(&trans->ctx,
3576 nft_trans_rule(trans),
3579 case NFT_MSG_NEWSET:
3580 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3581 /* This avoids hitting -EBUSY when deleting the table
3582 * from the transaction.
3584 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3585 !list_empty(&nft_trans_set(trans)->bindings))
3586 trans->ctx.table->use--;
3588 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3589 NFT_MSG_NEWSET, GFP_KERNEL);
3590 nft_trans_destroy(trans);
3592 case NFT_MSG_DELSET:
3593 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3594 NFT_MSG_DELSET, GFP_KERNEL);
3596 case NFT_MSG_NEWSETELEM:
3597 nf_tables_setelem_notify(&trans->ctx,
3598 nft_trans_elem_set(trans),
3599 &nft_trans_elem(trans),
3600 NFT_MSG_NEWSETELEM, 0);
3601 nft_trans_destroy(trans);
3603 case NFT_MSG_DELSETELEM:
3604 te = (struct nft_trans_elem *)trans->data;
3605 nf_tables_setelem_notify(&trans->ctx, te->set,
3607 NFT_MSG_DELSETELEM, 0);
3608 te->set->ops->get(te->set, &te->elem);
3609 te->set->ops->remove(te->set, &te->elem);
3610 nft_data_uninit(&te->elem.key, NFT_DATA_VALUE);
3611 if (te->elem.flags & NFT_SET_MAP) {
3612 nft_data_uninit(&te->elem.data,
3615 nft_trans_destroy(trans);
3622 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3623 list_del(&trans->list);
3624 nf_tables_commit_release(trans);
3627 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
3632 static void nf_tables_abort_release(struct nft_trans *trans)
3634 switch (trans->msg_type) {
3635 case NFT_MSG_NEWTABLE:
3636 nf_tables_table_destroy(&trans->ctx);
3638 case NFT_MSG_NEWCHAIN:
3639 nf_tables_chain_destroy(trans->ctx.chain);
3641 case NFT_MSG_NEWRULE:
3642 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3644 case NFT_MSG_NEWSET:
3645 nft_set_destroy(nft_trans_set(trans));
3651 static int nf_tables_abort(struct sk_buff *skb)
3653 struct net *net = sock_net(skb->sk);
3654 struct nft_trans *trans, *next;
3655 struct nft_set *set;
3657 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3658 switch (trans->msg_type) {
3659 case NFT_MSG_NEWTABLE:
3660 if (nft_trans_table_update(trans)) {
3661 if (nft_trans_table_enable(trans)) {
3662 nf_tables_table_disable(trans->ctx.afi,
3664 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3666 nft_trans_destroy(trans);
3668 list_del_rcu(&trans->ctx.table->list);
3671 case NFT_MSG_DELTABLE:
3672 list_add_tail_rcu(&trans->ctx.table->list,
3673 &trans->ctx.afi->tables);
3674 nft_trans_destroy(trans);
3676 case NFT_MSG_NEWCHAIN:
3677 if (nft_trans_chain_update(trans)) {
3678 free_percpu(nft_trans_chain_stats(trans));
3680 nft_trans_destroy(trans);
3682 trans->ctx.table->use--;
3683 list_del_rcu(&trans->ctx.chain->list);
3684 nf_tables_unregister_hooks(trans->ctx.table,
3686 trans->ctx.afi->nops);
3689 case NFT_MSG_DELCHAIN:
3690 trans->ctx.table->use++;
3691 list_add_tail_rcu(&trans->ctx.chain->list,
3692 &trans->ctx.table->chains);
3693 nft_trans_destroy(trans);
3695 case NFT_MSG_NEWRULE:
3696 trans->ctx.chain->use--;
3697 list_del_rcu(&nft_trans_rule(trans)->list);
3699 case NFT_MSG_DELRULE:
3700 trans->ctx.chain->use++;
3701 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3702 nft_trans_destroy(trans);
3704 case NFT_MSG_NEWSET:
3705 trans->ctx.table->use--;
3706 list_del_rcu(&nft_trans_set(trans)->list);
3708 case NFT_MSG_DELSET:
3709 trans->ctx.table->use++;
3710 list_add_tail_rcu(&nft_trans_set(trans)->list,
3711 &trans->ctx.table->sets);
3712 nft_trans_destroy(trans);
3714 case NFT_MSG_NEWSETELEM:
3715 nft_trans_elem_set(trans)->nelems--;
3716 set = nft_trans_elem_set(trans);
3717 set->ops->get(set, &nft_trans_elem(trans));
3718 set->ops->remove(set, &nft_trans_elem(trans));
3719 nft_trans_destroy(trans);
3721 case NFT_MSG_DELSETELEM:
3722 nft_trans_elem_set(trans)->nelems++;
3723 nft_trans_destroy(trans);
3730 list_for_each_entry_safe_reverse(trans, next,
3731 &net->nft.commit_list, list) {
3732 list_del(&trans->list);
3733 nf_tables_abort_release(trans);
3739 static const struct nfnetlink_subsystem nf_tables_subsys = {
3740 .name = "nf_tables",
3741 .subsys_id = NFNL_SUBSYS_NFTABLES,
3742 .cb_count = NFT_MSG_MAX,
3744 .commit = nf_tables_commit,
3745 .abort = nf_tables_abort,
3748 int nft_chain_validate_dependency(const struct nft_chain *chain,
3749 enum nft_chain_type type)
3751 const struct nft_base_chain *basechain;
3753 if (chain->flags & NFT_BASE_CHAIN) {
3754 basechain = nft_base_chain(chain);
3755 if (basechain->type->type != type)
3760 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
3762 int nft_chain_validate_hooks(const struct nft_chain *chain,
3763 unsigned int hook_flags)
3765 struct nft_base_chain *basechain;
3767 if (chain->flags & NFT_BASE_CHAIN) {
3768 basechain = nft_base_chain(chain);
3770 if ((1 << basechain->ops[0].hooknum) & hook_flags)
3778 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
3781 * Loop detection - walk through the ruleset beginning at the destination chain
3782 * of a new jump until either the source chain is reached (loop) or all
3783 * reachable chains have been traversed.
3785 * The loop check is performed whenever a new jump verdict is added to an
3786 * expression or verdict map or a verdict map is bound to a new chain.
3789 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3790 const struct nft_chain *chain);
3792 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3793 const struct nft_set *set,
3794 const struct nft_set_iter *iter,
3795 const struct nft_set_elem *elem)
3797 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3800 switch (elem->data.verdict) {
3803 return nf_tables_check_loops(ctx, elem->data.chain);
3809 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3810 const struct nft_chain *chain)
3812 const struct nft_rule *rule;
3813 const struct nft_expr *expr, *last;
3814 const struct nft_set *set;
3815 struct nft_set_binding *binding;
3816 struct nft_set_iter iter;
3818 if (ctx->chain == chain)
3821 list_for_each_entry(rule, &chain->rules, list) {
3822 nft_rule_for_each_expr(expr, last, rule) {
3823 const struct nft_data *data = NULL;
3826 if (!expr->ops->validate)
3829 err = expr->ops->validate(ctx, expr, &data);
3836 switch (data->verdict) {
3839 err = nf_tables_check_loops(ctx, data->chain);
3848 list_for_each_entry(set, &ctx->table->sets, list) {
3849 if (!(set->flags & NFT_SET_MAP) ||
3850 set->dtype != NFT_DATA_VERDICT)
3853 list_for_each_entry(binding, &set->bindings, list) {
3854 if (binding->chain != chain)
3860 iter.fn = nf_tables_loop_check_setelem;
3862 set->ops->walk(ctx, set, &iter);
3872 * nft_validate_input_register - validate an expressions' input register
3874 * @reg: the register number
3876 * Validate that the input register is one of the general purpose
3879 int nft_validate_input_register(enum nft_registers reg)
3881 if (reg <= NFT_REG_VERDICT)
3883 if (reg > NFT_REG_MAX)
3887 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3890 * nft_validate_output_register - validate an expressions' output register
3892 * @reg: the register number
3894 * Validate that the output register is one of the general purpose
3895 * registers or the verdict register.
3897 int nft_validate_output_register(enum nft_registers reg)
3899 if (reg < NFT_REG_VERDICT)
3901 if (reg > NFT_REG_MAX)
3905 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3908 * nft_validate_data_load - validate an expressions' data load
3910 * @ctx: context of the expression performing the load
3911 * @reg: the destination register number
3912 * @data: the data to load
3913 * @type: the data type
3915 * Validate that a data load uses the appropriate data type for
3916 * the destination register. A value of NULL for the data means
3917 * that its runtime gathered data, which is always of type
3920 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3921 const struct nft_data *data,
3922 enum nft_data_types type)
3927 case NFT_REG_VERDICT:
3928 if (data == NULL || type != NFT_DATA_VERDICT)
3931 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3932 err = nf_tables_check_loops(ctx, data->chain);
3936 if (ctx->chain->level + 1 > data->chain->level) {
3937 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3939 data->chain->level = ctx->chain->level + 1;
3945 if (data != NULL && type != NFT_DATA_VALUE)
3950 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3952 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3953 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3954 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3955 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3958 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3959 struct nft_data_desc *desc, const struct nlattr *nla)
3961 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3962 struct nft_chain *chain;
3965 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3969 if (!tb[NFTA_VERDICT_CODE])
3971 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3973 switch (data->verdict) {
3975 switch (data->verdict & NF_VERDICT_MASK) {
3987 desc->len = sizeof(data->verdict);
3991 if (!tb[NFTA_VERDICT_CHAIN])
3993 chain = nf_tables_chain_lookup(ctx->table,
3994 tb[NFTA_VERDICT_CHAIN]);
3996 return PTR_ERR(chain);
3997 if (chain->flags & NFT_BASE_CHAIN)
4001 data->chain = chain;
4002 desc->len = sizeof(data);
4006 desc->type = NFT_DATA_VERDICT;
4010 static void nft_verdict_uninit(const struct nft_data *data)
4012 switch (data->verdict) {
4020 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
4022 struct nlattr *nest;
4024 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
4026 goto nla_put_failure;
4028 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
4029 goto nla_put_failure;
4031 switch (data->verdict) {
4034 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
4035 goto nla_put_failure;
4037 nla_nest_end(skb, nest);
4044 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
4045 struct nft_data_desc *desc, const struct nlattr *nla)
4052 if (len > sizeof(data->data))
4055 nla_memcpy(data->data, nla, sizeof(data->data));
4056 desc->type = NFT_DATA_VALUE;
4061 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4064 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4067 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4068 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
4069 .len = FIELD_SIZEOF(struct nft_data, data) },
4070 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4074 * nft_data_init - parse nf_tables data netlink attributes
4076 * @ctx: context of the expression using the data
4077 * @data: destination struct nft_data
4078 * @desc: data description
4079 * @nla: netlink attribute containing data
4081 * Parse the netlink data attributes and initialize a struct nft_data.
4082 * The type and length of data are returned in the data description.
4084 * The caller can indicate that it only wants to accept data of type
4085 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4087 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
4088 struct nft_data_desc *desc, const struct nlattr *nla)
4090 struct nlattr *tb[NFTA_DATA_MAX + 1];
4093 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4097 if (tb[NFTA_DATA_VALUE])
4098 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
4099 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4100 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4103 EXPORT_SYMBOL_GPL(nft_data_init);
4106 * nft_data_uninit - release a nft_data item
4108 * @data: struct nft_data to release
4109 * @type: type of data
4111 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4112 * all others need to be released by calling this function.
4114 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4117 case NFT_DATA_VALUE:
4119 case NFT_DATA_VERDICT:
4120 return nft_verdict_uninit(data);
4125 EXPORT_SYMBOL_GPL(nft_data_uninit);
4127 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4128 enum nft_data_types type, unsigned int len)
4130 struct nlattr *nest;
4133 nest = nla_nest_start(skb, attr);
4138 case NFT_DATA_VALUE:
4139 err = nft_value_dump(skb, data, len);
4141 case NFT_DATA_VERDICT:
4142 err = nft_verdict_dump(skb, data);
4149 nla_nest_end(skb, nest);
4152 EXPORT_SYMBOL_GPL(nft_data_dump);
4154 static int nf_tables_init_net(struct net *net)
4156 INIT_LIST_HEAD(&net->nft.af_info);
4157 INIT_LIST_HEAD(&net->nft.commit_list);
4158 net->nft.base_seq = 1;
4162 static struct pernet_operations nf_tables_net_ops = {
4163 .init = nf_tables_init_net,
4166 static int __init nf_tables_module_init(void)
4170 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4177 err = nf_tables_core_module_init();
4181 err = nfnetlink_subsys_register(&nf_tables_subsys);
4185 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4186 return register_pernet_subsys(&nf_tables_net_ops);
4188 nf_tables_core_module_exit();
4195 static void __exit nf_tables_module_exit(void)
4197 unregister_pernet_subsys(&nf_tables_net_ops);
4198 nfnetlink_subsys_unregister(&nf_tables_subsys);
4200 nf_tables_core_module_exit();
4204 module_init(nf_tables_module_init);
4205 module_exit(nf_tables_module_exit);
4207 MODULE_LICENSE("GPL");
4208 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4209 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);