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)
230 rule->genmask &= ~(1 << gencursor_next(net));
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;
434 nlmsg_trim(skb, nlh);
438 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
444 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
448 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
452 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
453 event, 0, ctx->afi->family, ctx->table);
459 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
460 ctx->report, GFP_KERNEL);
463 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
469 static int nf_tables_dump_tables(struct sk_buff *skb,
470 struct netlink_callback *cb)
472 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
473 const struct nft_af_info *afi;
474 const struct nft_table *table;
475 unsigned int idx = 0, s_idx = cb->args[0];
476 struct net *net = sock_net(skb->sk);
477 int family = nfmsg->nfgen_family;
480 cb->seq = net->nft.base_seq;
482 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
483 if (family != NFPROTO_UNSPEC && family != afi->family)
486 list_for_each_entry_rcu(table, &afi->tables, list) {
490 memset(&cb->args[1], 0,
491 sizeof(cb->args) - sizeof(cb->args[0]));
492 if (nf_tables_fill_table_info(skb, net,
493 NETLINK_CB(cb->skb).portid,
497 afi->family, table) < 0)
500 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
511 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
512 const struct nlmsghdr *nlh,
513 const struct nlattr * const nla[])
515 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
516 const struct nft_af_info *afi;
517 const struct nft_table *table;
518 struct sk_buff *skb2;
519 struct net *net = sock_net(skb->sk);
520 int family = nfmsg->nfgen_family;
523 if (nlh->nlmsg_flags & NLM_F_DUMP) {
524 struct netlink_dump_control c = {
525 .dump = nf_tables_dump_tables,
527 return netlink_dump_start(nlsk, skb, nlh, &c);
530 afi = nf_tables_afinfo_lookup(net, family, false);
534 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
536 return PTR_ERR(table);
537 if (table->flags & NFT_TABLE_INACTIVE)
540 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
544 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
545 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
550 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
557 static int nf_tables_table_enable(const struct nft_af_info *afi,
558 struct nft_table *table)
560 struct nft_chain *chain;
563 list_for_each_entry(chain, &table->chains, list) {
564 if (!(chain->flags & NFT_BASE_CHAIN))
567 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
575 list_for_each_entry(chain, &table->chains, list) {
576 if (!(chain->flags & NFT_BASE_CHAIN))
582 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
587 static void nf_tables_table_disable(const struct nft_af_info *afi,
588 struct nft_table *table)
590 struct nft_chain *chain;
592 list_for_each_entry(chain, &table->chains, list) {
593 if (chain->flags & NFT_BASE_CHAIN)
594 nf_unregister_hooks(nft_base_chain(chain)->ops,
599 static int nf_tables_updtable(struct nft_ctx *ctx)
601 struct nft_trans *trans;
605 if (!ctx->nla[NFTA_TABLE_FLAGS])
608 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
609 if (flags & ~NFT_TABLE_F_DORMANT)
612 if (flags == ctx->table->flags)
615 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
616 sizeof(struct nft_trans_table));
620 if ((flags & NFT_TABLE_F_DORMANT) &&
621 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
622 nft_trans_table_enable(trans) = false;
623 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
624 ctx->table->flags & NFT_TABLE_F_DORMANT) {
625 ret = nf_tables_table_enable(ctx->afi, ctx->table);
627 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
628 nft_trans_table_enable(trans) = true;
634 nft_trans_table_update(trans) = true;
635 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
638 nft_trans_destroy(trans);
642 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
643 const struct nlmsghdr *nlh,
644 const struct nlattr * const nla[])
646 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
647 const struct nlattr *name;
648 struct nft_af_info *afi;
649 struct nft_table *table;
650 struct net *net = sock_net(skb->sk);
651 int family = nfmsg->nfgen_family;
656 afi = nf_tables_afinfo_lookup(net, family, true);
660 name = nla[NFTA_TABLE_NAME];
661 table = nf_tables_table_lookup(afi, name);
663 if (PTR_ERR(table) != -ENOENT)
664 return PTR_ERR(table);
669 if (table->flags & NFT_TABLE_INACTIVE)
671 if (nlh->nlmsg_flags & NLM_F_EXCL)
673 if (nlh->nlmsg_flags & NLM_F_REPLACE)
676 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
677 return nf_tables_updtable(&ctx);
680 if (nla[NFTA_TABLE_FLAGS]) {
681 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
682 if (flags & ~NFT_TABLE_F_DORMANT)
686 if (!try_module_get(afi->owner))
687 return -EAFNOSUPPORT;
689 table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL);
691 module_put(afi->owner);
695 nla_strlcpy(table->name, name, nla_len(name));
696 INIT_LIST_HEAD(&table->chains);
697 INIT_LIST_HEAD(&table->sets);
698 table->flags = flags;
700 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
701 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
704 module_put(afi->owner);
707 list_add_tail_rcu(&table->list, &afi->tables);
711 static int nft_flush_table(struct nft_ctx *ctx)
714 struct nft_chain *chain, *nc;
715 struct nft_set *set, *ns;
717 list_for_each_entry(chain, &ctx->table->chains, list) {
720 err = nft_delrule_by_chain(ctx);
725 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
726 if (set->flags & NFT_SET_ANONYMOUS &&
727 !list_empty(&set->bindings))
730 err = nft_delset(ctx, set);
735 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
738 err = nft_delchain(ctx);
743 err = nft_deltable(ctx);
748 static int nft_flush(struct nft_ctx *ctx, int family)
750 struct nft_af_info *afi;
751 struct nft_table *table, *nt;
752 const struct nlattr * const *nla = ctx->nla;
755 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
756 if (family != AF_UNSPEC && afi->family != family)
760 list_for_each_entry_safe(table, nt, &afi->tables, list) {
761 if (nla[NFTA_TABLE_NAME] &&
762 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
767 err = nft_flush_table(ctx);
776 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
777 const struct nlmsghdr *nlh,
778 const struct nlattr * const nla[])
780 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
781 struct nft_af_info *afi;
782 struct nft_table *table;
783 struct net *net = sock_net(skb->sk);
784 int family = nfmsg->nfgen_family;
787 nft_ctx_init(&ctx, skb, nlh, NULL, NULL, NULL, nla);
788 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
789 return nft_flush(&ctx, family);
791 afi = nf_tables_afinfo_lookup(net, family, false);
795 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
797 return PTR_ERR(table);
798 if (table->flags & NFT_TABLE_INACTIVE)
804 return nft_flush_table(&ctx);
807 static void nf_tables_table_destroy(struct nft_ctx *ctx)
809 BUG_ON(ctx->table->use > 0);
812 module_put(ctx->afi->owner);
815 int nft_register_chain_type(const struct nf_chain_type *ctype)
819 nfnl_lock(NFNL_SUBSYS_NFTABLES);
820 if (chain_type[ctype->family][ctype->type] != NULL) {
824 chain_type[ctype->family][ctype->type] = ctype;
826 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
829 EXPORT_SYMBOL_GPL(nft_register_chain_type);
831 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
833 nfnl_lock(NFNL_SUBSYS_NFTABLES);
834 chain_type[ctype->family][ctype->type] = NULL;
835 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
837 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
843 static struct nft_chain *
844 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
846 struct nft_chain *chain;
848 list_for_each_entry(chain, &table->chains, list) {
849 if (chain->handle == handle)
853 return ERR_PTR(-ENOENT);
856 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
857 const struct nlattr *nla)
859 struct nft_chain *chain;
862 return ERR_PTR(-EINVAL);
864 list_for_each_entry(chain, &table->chains, list) {
865 if (!nla_strcmp(nla, chain->name))
869 return ERR_PTR(-ENOENT);
872 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
873 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
874 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
875 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
876 .len = NFT_CHAIN_MAXNAMELEN - 1 },
877 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
878 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
879 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
880 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
883 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
884 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
885 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
888 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
890 struct nft_stats *cpu_stats, total;
896 memset(&total, 0, sizeof(total));
897 for_each_possible_cpu(cpu) {
898 cpu_stats = per_cpu_ptr(stats, cpu);
900 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
901 pkts = cpu_stats->pkts;
902 bytes = cpu_stats->bytes;
903 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
905 total.bytes += bytes;
907 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
909 goto nla_put_failure;
911 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
912 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
913 goto nla_put_failure;
915 nla_nest_end(skb, nest);
922 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
923 u32 portid, u32 seq, int event, u32 flags,
924 int family, const struct nft_table *table,
925 const struct nft_chain *chain)
927 struct nlmsghdr *nlh;
928 struct nfgenmsg *nfmsg;
930 event |= NFNL_SUBSYS_NFTABLES << 8;
931 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
933 goto nla_put_failure;
935 nfmsg = nlmsg_data(nlh);
936 nfmsg->nfgen_family = family;
937 nfmsg->version = NFNETLINK_V0;
938 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
940 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
941 goto nla_put_failure;
942 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
943 goto nla_put_failure;
944 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
945 goto nla_put_failure;
947 if (chain->flags & NFT_BASE_CHAIN) {
948 const struct nft_base_chain *basechain = nft_base_chain(chain);
949 const struct nf_hook_ops *ops = &basechain->ops[0];
952 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
954 goto nla_put_failure;
955 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
956 goto nla_put_failure;
957 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
958 goto nla_put_failure;
959 nla_nest_end(skb, nest);
961 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
962 htonl(basechain->policy)))
963 goto nla_put_failure;
965 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
966 goto nla_put_failure;
968 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
969 goto nla_put_failure;
972 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
973 goto nla_put_failure;
979 nlmsg_trim(skb, nlh);
983 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
989 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
993 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
997 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
998 event, 0, ctx->afi->family, ctx->table,
1005 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1006 ctx->report, GFP_KERNEL);
1009 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1015 static int nf_tables_dump_chains(struct sk_buff *skb,
1016 struct netlink_callback *cb)
1018 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1019 const struct nft_af_info *afi;
1020 const struct nft_table *table;
1021 const struct nft_chain *chain;
1022 unsigned int idx = 0, s_idx = cb->args[0];
1023 struct net *net = sock_net(skb->sk);
1024 int family = nfmsg->nfgen_family;
1027 cb->seq = net->nft.base_seq;
1029 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1030 if (family != NFPROTO_UNSPEC && family != afi->family)
1033 list_for_each_entry_rcu(table, &afi->tables, list) {
1034 list_for_each_entry_rcu(chain, &table->chains, list) {
1038 memset(&cb->args[1], 0,
1039 sizeof(cb->args) - sizeof(cb->args[0]));
1040 if (nf_tables_fill_chain_info(skb, net,
1041 NETLINK_CB(cb->skb).portid,
1045 afi->family, table, chain) < 0)
1048 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1060 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
1061 const struct nlmsghdr *nlh,
1062 const struct nlattr * const nla[])
1064 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1065 const struct nft_af_info *afi;
1066 const struct nft_table *table;
1067 const struct nft_chain *chain;
1068 struct sk_buff *skb2;
1069 struct net *net = sock_net(skb->sk);
1070 int family = nfmsg->nfgen_family;
1073 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1074 struct netlink_dump_control c = {
1075 .dump = nf_tables_dump_chains,
1077 return netlink_dump_start(nlsk, skb, nlh, &c);
1080 afi = nf_tables_afinfo_lookup(net, family, false);
1082 return PTR_ERR(afi);
1084 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1086 return PTR_ERR(table);
1087 if (table->flags & NFT_TABLE_INACTIVE)
1090 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1092 return PTR_ERR(chain);
1093 if (chain->flags & NFT_CHAIN_INACTIVE)
1096 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1100 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1101 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1102 family, table, chain);
1106 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1113 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1114 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1115 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1118 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1120 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1121 struct nft_stats __percpu *newstats;
1122 struct nft_stats *stats;
1125 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1127 return ERR_PTR(err);
1129 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1130 return ERR_PTR(-EINVAL);
1132 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1133 if (newstats == NULL)
1134 return ERR_PTR(-ENOMEM);
1136 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1137 * are not exposed to userspace.
1140 stats = this_cpu_ptr(newstats);
1141 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1142 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1148 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1149 struct nft_stats __percpu *newstats)
1151 if (newstats == NULL)
1155 struct nft_stats __percpu *oldstats =
1156 nft_dereference(chain->stats);
1158 rcu_assign_pointer(chain->stats, newstats);
1160 free_percpu(oldstats);
1162 rcu_assign_pointer(chain->stats, newstats);
1165 static void nf_tables_chain_destroy(struct nft_chain *chain)
1167 BUG_ON(chain->use > 0);
1169 if (chain->flags & NFT_BASE_CHAIN) {
1170 module_put(nft_base_chain(chain)->type->owner);
1171 free_percpu(nft_base_chain(chain)->stats);
1172 kfree(nft_base_chain(chain));
1178 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
1179 const struct nlmsghdr *nlh,
1180 const struct nlattr * const nla[])
1182 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1183 const struct nlattr * uninitialized_var(name);
1184 struct nft_af_info *afi;
1185 struct nft_table *table;
1186 struct nft_chain *chain;
1187 struct nft_base_chain *basechain = NULL;
1188 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1189 struct net *net = sock_net(skb->sk);
1190 int family = nfmsg->nfgen_family;
1191 u8 policy = NF_ACCEPT;
1194 struct nft_stats __percpu *stats;
1199 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1201 afi = nf_tables_afinfo_lookup(net, family, true);
1203 return PTR_ERR(afi);
1205 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1207 return PTR_ERR(table);
1210 name = nla[NFTA_CHAIN_NAME];
1212 if (nla[NFTA_CHAIN_HANDLE]) {
1213 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1214 chain = nf_tables_chain_lookup_byhandle(table, handle);
1216 return PTR_ERR(chain);
1218 chain = nf_tables_chain_lookup(table, name);
1219 if (IS_ERR(chain)) {
1220 if (PTR_ERR(chain) != -ENOENT)
1221 return PTR_ERR(chain);
1226 if (nla[NFTA_CHAIN_POLICY]) {
1227 if ((chain != NULL &&
1228 !(chain->flags & NFT_BASE_CHAIN)))
1231 if (chain == NULL &&
1232 nla[NFTA_CHAIN_HOOK] == NULL)
1235 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1245 if (chain != NULL) {
1246 struct nft_stats *stats = NULL;
1247 struct nft_trans *trans;
1249 if (chain->flags & NFT_CHAIN_INACTIVE)
1251 if (nlh->nlmsg_flags & NLM_F_EXCL)
1253 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1256 if (nla[NFTA_CHAIN_HANDLE] && name &&
1257 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1260 if (nla[NFTA_CHAIN_COUNTERS]) {
1261 if (!(chain->flags & NFT_BASE_CHAIN))
1264 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1266 return PTR_ERR(stats);
1269 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1270 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1271 sizeof(struct nft_trans_chain));
1272 if (trans == NULL) {
1277 nft_trans_chain_stats(trans) = stats;
1278 nft_trans_chain_update(trans) = true;
1280 if (nla[NFTA_CHAIN_POLICY])
1281 nft_trans_chain_policy(trans) = policy;
1283 nft_trans_chain_policy(trans) = -1;
1285 if (nla[NFTA_CHAIN_HANDLE] && name) {
1286 nla_strlcpy(nft_trans_chain_name(trans), name,
1287 NFT_CHAIN_MAXNAMELEN);
1289 list_add_tail(&trans->list, &net->nft.commit_list);
1293 if (table->use == UINT_MAX)
1296 if (nla[NFTA_CHAIN_HOOK]) {
1297 const struct nf_chain_type *type;
1298 struct nf_hook_ops *ops;
1300 u32 hooknum, priority;
1302 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1303 if (nla[NFTA_CHAIN_TYPE]) {
1304 type = nf_tables_chain_type_lookup(afi,
1305 nla[NFTA_CHAIN_TYPE],
1308 return PTR_ERR(type);
1311 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1315 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1316 ha[NFTA_HOOK_PRIORITY] == NULL)
1319 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1320 if (hooknum >= afi->nhooks)
1322 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1324 if (!(type->hook_mask & (1 << hooknum)))
1326 if (!try_module_get(type->owner))
1328 hookfn = type->hooks[hooknum];
1330 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1331 if (basechain == NULL) {
1332 module_put(type->owner);
1336 if (nla[NFTA_CHAIN_COUNTERS]) {
1337 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1338 if (IS_ERR(stats)) {
1339 module_put(type->owner);
1341 return PTR_ERR(stats);
1343 basechain->stats = stats;
1345 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1346 if (stats == NULL) {
1347 module_put(type->owner);
1351 rcu_assign_pointer(basechain->stats, stats);
1354 basechain->type = type;
1355 chain = &basechain->chain;
1357 for (i = 0; i < afi->nops; i++) {
1358 ops = &basechain->ops[i];
1360 ops->owner = afi->owner;
1361 ops->hooknum = hooknum;
1362 ops->priority = priority;
1364 ops->hook = afi->hooks[ops->hooknum];
1367 if (afi->hook_ops_init)
1368 afi->hook_ops_init(ops, i);
1371 chain->flags |= NFT_BASE_CHAIN;
1372 basechain->policy = policy;
1374 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1379 INIT_LIST_HEAD(&chain->rules);
1380 chain->handle = nf_tables_alloc_handle(table);
1382 chain->table = table;
1383 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1385 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1386 chain->flags & NFT_BASE_CHAIN) {
1387 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1392 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1393 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1398 list_add_tail_rcu(&chain->list, &table->chains);
1401 nf_tables_unregister_hooks(table, chain, afi->nops);
1403 nf_tables_chain_destroy(chain);
1407 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1408 const struct nlmsghdr *nlh,
1409 const struct nlattr * const nla[])
1411 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1412 struct nft_af_info *afi;
1413 struct nft_table *table;
1414 struct nft_chain *chain;
1415 struct net *net = sock_net(skb->sk);
1416 int family = nfmsg->nfgen_family;
1419 afi = nf_tables_afinfo_lookup(net, family, false);
1421 return PTR_ERR(afi);
1423 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1425 return PTR_ERR(table);
1426 if (table->flags & NFT_TABLE_INACTIVE)
1429 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1431 return PTR_ERR(chain);
1432 if (chain->flags & NFT_CHAIN_INACTIVE)
1437 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1439 return nft_delchain(&ctx);
1447 * nft_register_expr - register nf_tables expr type
1450 * Registers the expr type for use with nf_tables. Returns zero on
1451 * success or a negative errno code otherwise.
1453 int nft_register_expr(struct nft_expr_type *type)
1455 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1456 if (type->family == NFPROTO_UNSPEC)
1457 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1459 list_add_rcu(&type->list, &nf_tables_expressions);
1460 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1463 EXPORT_SYMBOL_GPL(nft_register_expr);
1466 * nft_unregister_expr - unregister nf_tables expr type
1469 * Unregisters the expr typefor use with nf_tables.
1471 void nft_unregister_expr(struct nft_expr_type *type)
1473 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1474 list_del_rcu(&type->list);
1475 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1477 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1479 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1482 const struct nft_expr_type *type;
1484 list_for_each_entry(type, &nf_tables_expressions, list) {
1485 if (!nla_strcmp(nla, type->name) &&
1486 (!type->family || type->family == family))
1492 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1495 const struct nft_expr_type *type;
1498 return ERR_PTR(-EINVAL);
1500 type = __nft_expr_type_get(family, nla);
1501 if (type != NULL && try_module_get(type->owner))
1504 #ifdef CONFIG_MODULES
1506 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1507 request_module("nft-expr-%u-%.*s", family,
1508 nla_len(nla), (char *)nla_data(nla));
1509 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1510 if (__nft_expr_type_get(family, nla))
1511 return ERR_PTR(-EAGAIN);
1513 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1514 request_module("nft-expr-%.*s",
1515 nla_len(nla), (char *)nla_data(nla));
1516 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1517 if (__nft_expr_type_get(family, nla))
1518 return ERR_PTR(-EAGAIN);
1521 return ERR_PTR(-ENOENT);
1524 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1525 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1526 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1529 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1530 const struct nft_expr *expr)
1532 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1533 goto nla_put_failure;
1535 if (expr->ops->dump) {
1536 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1538 goto nla_put_failure;
1539 if (expr->ops->dump(skb, expr) < 0)
1540 goto nla_put_failure;
1541 nla_nest_end(skb, data);
1550 struct nft_expr_info {
1551 const struct nft_expr_ops *ops;
1552 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1555 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1556 const struct nlattr *nla,
1557 struct nft_expr_info *info)
1559 const struct nft_expr_type *type;
1560 const struct nft_expr_ops *ops;
1561 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1564 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1568 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1570 return PTR_ERR(type);
1572 if (tb[NFTA_EXPR_DATA]) {
1573 err = nla_parse_nested(info->tb, type->maxattr,
1574 tb[NFTA_EXPR_DATA], type->policy);
1578 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1580 if (type->select_ops != NULL) {
1581 ops = type->select_ops(ctx,
1582 (const struct nlattr * const *)info->tb);
1594 module_put(type->owner);
1598 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1599 const struct nft_expr_info *info,
1600 struct nft_expr *expr)
1602 const struct nft_expr_ops *ops = info->ops;
1607 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1619 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1620 struct nft_expr *expr)
1622 if (expr->ops->destroy)
1623 expr->ops->destroy(ctx, expr);
1624 module_put(expr->ops->type->owner);
1631 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1634 struct nft_rule *rule;
1636 // FIXME: this sucks
1637 list_for_each_entry(rule, &chain->rules, list) {
1638 if (handle == rule->handle)
1642 return ERR_PTR(-ENOENT);
1645 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1646 const struct nlattr *nla)
1649 return ERR_PTR(-EINVAL);
1651 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1654 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1655 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1656 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1657 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1658 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1659 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1660 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1661 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1662 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1663 .len = NFT_USERDATA_MAXLEN },
1666 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1667 u32 portid, u32 seq, int event,
1668 u32 flags, int family,
1669 const struct nft_table *table,
1670 const struct nft_chain *chain,
1671 const struct nft_rule *rule)
1673 struct nlmsghdr *nlh;
1674 struct nfgenmsg *nfmsg;
1675 const struct nft_expr *expr, *next;
1676 struct nlattr *list;
1677 const struct nft_rule *prule;
1678 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1680 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1683 goto nla_put_failure;
1685 nfmsg = nlmsg_data(nlh);
1686 nfmsg->nfgen_family = family;
1687 nfmsg->version = NFNETLINK_V0;
1688 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1690 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1691 goto nla_put_failure;
1692 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1693 goto nla_put_failure;
1694 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1695 goto nla_put_failure;
1697 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1698 prule = list_entry(rule->list.prev, struct nft_rule, list);
1699 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1700 cpu_to_be64(prule->handle)))
1701 goto nla_put_failure;
1704 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1706 goto nla_put_failure;
1707 nft_rule_for_each_expr(expr, next, rule) {
1708 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1710 goto nla_put_failure;
1711 if (nf_tables_fill_expr_info(skb, expr) < 0)
1712 goto nla_put_failure;
1713 nla_nest_end(skb, elem);
1715 nla_nest_end(skb, list);
1718 struct nft_userdata *udata = nft_userdata(rule);
1719 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1721 goto nla_put_failure;
1724 nlmsg_end(skb, nlh);
1728 nlmsg_trim(skb, nlh);
1732 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1733 const struct nft_rule *rule,
1736 struct sk_buff *skb;
1740 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1744 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1748 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1749 event, 0, ctx->afi->family, ctx->table,
1756 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1757 ctx->report, GFP_KERNEL);
1760 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1766 static int nf_tables_dump_rules(struct sk_buff *skb,
1767 struct netlink_callback *cb)
1769 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1770 const struct nft_af_info *afi;
1771 const struct nft_table *table;
1772 const struct nft_chain *chain;
1773 const struct nft_rule *rule;
1774 unsigned int idx = 0, s_idx = cb->args[0];
1775 struct net *net = sock_net(skb->sk);
1776 int family = nfmsg->nfgen_family;
1779 cb->seq = net->nft.base_seq;
1781 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1782 if (family != NFPROTO_UNSPEC && family != afi->family)
1785 list_for_each_entry_rcu(table, &afi->tables, list) {
1786 list_for_each_entry_rcu(chain, &table->chains, list) {
1787 list_for_each_entry_rcu(rule, &chain->rules, list) {
1788 if (!nft_rule_is_active(net, rule))
1793 memset(&cb->args[1], 0,
1794 sizeof(cb->args) - sizeof(cb->args[0]));
1795 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1798 NLM_F_MULTI | NLM_F_APPEND,
1799 afi->family, table, chain, rule) < 0)
1802 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1816 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1817 const struct nlmsghdr *nlh,
1818 const struct nlattr * const nla[])
1820 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1821 const struct nft_af_info *afi;
1822 const struct nft_table *table;
1823 const struct nft_chain *chain;
1824 const struct nft_rule *rule;
1825 struct sk_buff *skb2;
1826 struct net *net = sock_net(skb->sk);
1827 int family = nfmsg->nfgen_family;
1830 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1831 struct netlink_dump_control c = {
1832 .dump = nf_tables_dump_rules,
1834 return netlink_dump_start(nlsk, skb, nlh, &c);
1837 afi = nf_tables_afinfo_lookup(net, family, false);
1839 return PTR_ERR(afi);
1841 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1843 return PTR_ERR(table);
1844 if (table->flags & NFT_TABLE_INACTIVE)
1847 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1849 return PTR_ERR(chain);
1850 if (chain->flags & NFT_CHAIN_INACTIVE)
1853 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1855 return PTR_ERR(rule);
1857 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1861 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1862 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1863 family, table, chain, rule);
1867 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1874 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1875 struct nft_rule *rule)
1877 struct nft_expr *expr;
1880 * Careful: some expressions might not be initialized in case this
1881 * is called on error from nf_tables_newrule().
1883 expr = nft_expr_first(rule);
1884 while (expr->ops && expr != nft_expr_last(rule)) {
1885 nf_tables_expr_destroy(ctx, expr);
1886 expr = nft_expr_next(expr);
1891 #define NFT_RULE_MAXEXPRS 128
1893 static struct nft_expr_info *info;
1895 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1896 const struct nlmsghdr *nlh,
1897 const struct nlattr * const nla[])
1899 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1900 struct nft_af_info *afi;
1901 struct net *net = sock_net(skb->sk);
1902 struct nft_table *table;
1903 struct nft_chain *chain;
1904 struct nft_rule *rule, *old_rule = NULL;
1905 struct nft_userdata *udata;
1906 struct nft_trans *trans = NULL;
1907 struct nft_expr *expr;
1910 unsigned int size, i, n, ulen = 0, usize = 0;
1913 u64 handle, pos_handle;
1915 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1917 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1919 return PTR_ERR(afi);
1921 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1923 return PTR_ERR(table);
1925 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1927 return PTR_ERR(chain);
1929 if (nla[NFTA_RULE_HANDLE]) {
1930 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1931 rule = __nf_tables_rule_lookup(chain, handle);
1933 return PTR_ERR(rule);
1935 if (nlh->nlmsg_flags & NLM_F_EXCL)
1937 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1942 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1944 handle = nf_tables_alloc_handle(table);
1946 if (chain->use == UINT_MAX)
1950 if (nla[NFTA_RULE_POSITION]) {
1951 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1954 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1955 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1956 if (IS_ERR(old_rule))
1957 return PTR_ERR(old_rule);
1960 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1964 if (nla[NFTA_RULE_EXPRESSIONS]) {
1965 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1967 if (nla_type(tmp) != NFTA_LIST_ELEM)
1969 if (n == NFT_RULE_MAXEXPRS)
1971 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1974 size += info[n].ops->size;
1978 /* Check for overflow of dlen field */
1980 if (size >= 1 << 12)
1983 if (nla[NFTA_RULE_USERDATA]) {
1984 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
1986 usize = sizeof(struct nft_userdata) + ulen;
1990 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
1994 nft_rule_activate_next(net, rule);
1996 rule->handle = handle;
1998 rule->udata = ulen ? 1 : 0;
2001 udata = nft_userdata(rule);
2002 udata->len = ulen - 1;
2003 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2006 expr = nft_expr_first(rule);
2007 for (i = 0; i < n; i++) {
2008 err = nf_tables_newexpr(&ctx, &info[i], expr);
2012 expr = nft_expr_next(expr);
2015 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2016 if (nft_rule_is_active_next(net, old_rule)) {
2017 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2019 if (trans == NULL) {
2023 nft_rule_deactivate_next(net, old_rule);
2025 list_add_tail_rcu(&rule->list, &old_rule->list);
2030 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2032 list_add_rcu(&rule->list, &old_rule->list);
2034 list_add_tail_rcu(&rule->list, &chain->rules);
2037 list_add_tail_rcu(&rule->list, &old_rule->list);
2039 list_add_rcu(&rule->list, &chain->rules);
2042 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2050 list_del_rcu(&rule->list);
2052 nf_tables_rule_destroy(&ctx, rule);
2054 for (i = 0; i < n; i++) {
2055 if (info[i].ops != NULL)
2056 module_put(info[i].ops->type->owner);
2061 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
2062 const struct nlmsghdr *nlh,
2063 const struct nlattr * const nla[])
2065 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2066 struct nft_af_info *afi;
2067 struct net *net = sock_net(skb->sk);
2068 struct nft_table *table;
2069 struct nft_chain *chain = NULL;
2070 struct nft_rule *rule;
2071 int family = nfmsg->nfgen_family, err = 0;
2074 afi = nf_tables_afinfo_lookup(net, family, false);
2076 return PTR_ERR(afi);
2078 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2080 return PTR_ERR(table);
2081 if (table->flags & NFT_TABLE_INACTIVE)
2084 if (nla[NFTA_RULE_CHAIN]) {
2085 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2087 return PTR_ERR(chain);
2090 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
2093 if (nla[NFTA_RULE_HANDLE]) {
2094 rule = nf_tables_rule_lookup(chain,
2095 nla[NFTA_RULE_HANDLE]);
2097 return PTR_ERR(rule);
2099 err = nft_delrule(&ctx, rule);
2101 err = nft_delrule_by_chain(&ctx);
2104 list_for_each_entry(chain, &table->chains, list) {
2106 err = nft_delrule_by_chain(&ctx);
2119 static LIST_HEAD(nf_tables_set_ops);
2121 int nft_register_set(struct nft_set_ops *ops)
2123 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2124 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2125 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2128 EXPORT_SYMBOL_GPL(nft_register_set);
2130 void nft_unregister_set(struct nft_set_ops *ops)
2132 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2133 list_del_rcu(&ops->list);
2134 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2136 EXPORT_SYMBOL_GPL(nft_unregister_set);
2139 * Select a set implementation based on the data characteristics and the
2140 * given policy. The total memory use might not be known if no size is
2141 * given, in that case the amount of memory per element is used.
2143 static const struct nft_set_ops *
2144 nft_select_set_ops(const struct nlattr * const nla[],
2145 const struct nft_set_desc *desc,
2146 enum nft_set_policies policy)
2148 const struct nft_set_ops *ops, *bops;
2149 struct nft_set_estimate est, best;
2152 #ifdef CONFIG_MODULES
2153 if (list_empty(&nf_tables_set_ops)) {
2154 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2155 request_module("nft-set");
2156 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2157 if (!list_empty(&nf_tables_set_ops))
2158 return ERR_PTR(-EAGAIN);
2162 if (nla[NFTA_SET_FLAGS] != NULL) {
2163 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2164 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
2171 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2172 if ((ops->features & features) != features)
2174 if (!ops->estimate(desc, features, &est))
2178 case NFT_SET_POL_PERFORMANCE:
2179 if (est.class < best.class)
2181 if (est.class == best.class && est.size < best.size)
2184 case NFT_SET_POL_MEMORY:
2185 if (est.size < best.size)
2187 if (est.size == best.size && est.class < best.class)
2194 if (!try_module_get(ops->owner))
2197 module_put(bops->owner);
2206 return ERR_PTR(-EOPNOTSUPP);
2209 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2210 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2211 [NFTA_SET_NAME] = { .type = NLA_STRING,
2212 .len = IFNAMSIZ - 1 },
2213 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2214 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2215 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2216 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2217 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2218 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2219 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2220 [NFTA_SET_ID] = { .type = NLA_U32 },
2223 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2224 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2227 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2228 const struct sk_buff *skb,
2229 const struct nlmsghdr *nlh,
2230 const struct nlattr * const nla[])
2232 struct net *net = sock_net(skb->sk);
2233 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2234 struct nft_af_info *afi = NULL;
2235 struct nft_table *table = NULL;
2237 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2238 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2240 return PTR_ERR(afi);
2243 if (nla[NFTA_SET_TABLE] != NULL) {
2245 return -EAFNOSUPPORT;
2247 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2249 return PTR_ERR(table);
2250 if (table->flags & NFT_TABLE_INACTIVE)
2254 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2258 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2259 const struct nlattr *nla)
2261 struct nft_set *set;
2264 return ERR_PTR(-EINVAL);
2266 list_for_each_entry(set, &table->sets, list) {
2267 if (!nla_strcmp(nla, set->name))
2270 return ERR_PTR(-ENOENT);
2273 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2274 const struct nlattr *nla)
2276 struct nft_trans *trans;
2277 u32 id = ntohl(nla_get_be32(nla));
2279 list_for_each_entry(trans, &net->nft.commit_list, list) {
2280 if (trans->msg_type == NFT_MSG_NEWSET &&
2281 id == nft_trans_set_id(trans))
2282 return nft_trans_set(trans);
2284 return ERR_PTR(-ENOENT);
2287 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2290 const struct nft_set *i;
2292 unsigned long *inuse;
2293 unsigned int n = 0, min = 0;
2295 p = strnchr(name, IFNAMSIZ, '%');
2297 if (p[1] != 'd' || strchr(p + 2, '%'))
2300 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2304 list_for_each_entry(i, &ctx->table->sets, list) {
2307 if (!sscanf(i->name, name, &tmp))
2309 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2312 set_bit(tmp - min, inuse);
2315 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2316 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2317 min += BITS_PER_BYTE * PAGE_SIZE;
2318 memset(inuse, 0, PAGE_SIZE);
2321 free_page((unsigned long)inuse);
2324 snprintf(set->name, sizeof(set->name), name, min + n);
2325 list_for_each_entry(i, &ctx->table->sets, list) {
2326 if (!strcmp(set->name, i->name))
2332 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2333 const struct nft_set *set, u16 event, u16 flags)
2335 struct nfgenmsg *nfmsg;
2336 struct nlmsghdr *nlh;
2337 struct nlattr *desc;
2338 u32 portid = ctx->portid;
2341 event |= NFNL_SUBSYS_NFTABLES << 8;
2342 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2345 goto nla_put_failure;
2347 nfmsg = nlmsg_data(nlh);
2348 nfmsg->nfgen_family = ctx->afi->family;
2349 nfmsg->version = NFNETLINK_V0;
2350 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2352 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2353 goto nla_put_failure;
2354 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2355 goto nla_put_failure;
2356 if (set->flags != 0)
2357 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2358 goto nla_put_failure;
2360 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2361 goto nla_put_failure;
2362 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2363 goto nla_put_failure;
2364 if (set->flags & NFT_SET_MAP) {
2365 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2366 goto nla_put_failure;
2367 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2368 goto nla_put_failure;
2371 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2372 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2373 goto nla_put_failure;
2376 desc = nla_nest_start(skb, NFTA_SET_DESC);
2378 goto nla_put_failure;
2380 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2381 goto nla_put_failure;
2382 nla_nest_end(skb, desc);
2384 nlmsg_end(skb, nlh);
2388 nlmsg_trim(skb, nlh);
2392 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2393 const struct nft_set *set,
2394 int event, gfp_t gfp_flags)
2396 struct sk_buff *skb;
2397 u32 portid = ctx->portid;
2401 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2405 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2409 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2415 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2416 ctx->report, gfp_flags);
2419 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2423 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2425 const struct nft_set *set;
2426 unsigned int idx, s_idx = cb->args[0];
2427 struct nft_af_info *afi;
2428 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2429 struct net *net = sock_net(skb->sk);
2430 int cur_family = cb->args[3];
2431 struct nft_ctx *ctx = cb->data, ctx_set;
2437 cb->seq = net->nft.base_seq;
2439 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2440 if (ctx->afi && ctx->afi != afi)
2444 if (afi->family != cur_family)
2449 list_for_each_entry_rcu(table, &afi->tables, list) {
2450 if (ctx->table && ctx->table != table)
2454 if (cur_table != table)
2460 list_for_each_entry_rcu(set, &table->sets, list) {
2465 ctx_set.table = table;
2467 if (nf_tables_fill_set(skb, &ctx_set, set,
2471 cb->args[2] = (unsigned long) table;
2472 cb->args[3] = afi->family;
2475 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2489 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2495 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2496 const struct nlmsghdr *nlh,
2497 const struct nlattr * const nla[])
2499 const struct nft_set *set;
2501 struct sk_buff *skb2;
2502 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2505 /* Verify existence before starting dump */
2506 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2510 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2511 struct netlink_dump_control c = {
2512 .dump = nf_tables_dump_sets,
2513 .done = nf_tables_dump_sets_done,
2515 struct nft_ctx *ctx_dump;
2517 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2518 if (ctx_dump == NULL)
2524 return netlink_dump_start(nlsk, skb, nlh, &c);
2527 /* Only accept unspec with dump */
2528 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2529 return -EAFNOSUPPORT;
2531 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2533 return PTR_ERR(set);
2534 if (set->flags & NFT_SET_INACTIVE)
2537 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2541 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2545 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2552 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2553 struct nft_set_desc *desc,
2554 const struct nlattr *nla)
2556 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2559 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2563 if (da[NFTA_SET_DESC_SIZE] != NULL)
2564 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2569 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2570 const struct nlmsghdr *nlh,
2571 const struct nlattr * const nla[])
2573 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2574 const struct nft_set_ops *ops;
2575 struct nft_af_info *afi;
2576 struct net *net = sock_net(skb->sk);
2577 struct nft_table *table;
2578 struct nft_set *set;
2580 char name[IFNAMSIZ];
2583 u32 ktype, dtype, flags, policy;
2584 struct nft_set_desc desc;
2587 if (nla[NFTA_SET_TABLE] == NULL ||
2588 nla[NFTA_SET_NAME] == NULL ||
2589 nla[NFTA_SET_KEY_LEN] == NULL ||
2590 nla[NFTA_SET_ID] == NULL)
2593 memset(&desc, 0, sizeof(desc));
2595 ktype = NFT_DATA_VALUE;
2596 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2597 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2598 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2602 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2603 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2607 if (nla[NFTA_SET_FLAGS] != NULL) {
2608 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2609 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2610 NFT_SET_INTERVAL | NFT_SET_MAP))
2615 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2616 if (!(flags & NFT_SET_MAP))
2619 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2620 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2621 dtype != NFT_DATA_VERDICT)
2624 if (dtype != NFT_DATA_VERDICT) {
2625 if (nla[NFTA_SET_DATA_LEN] == NULL)
2627 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2628 if (desc.dlen == 0 ||
2629 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2632 desc.dlen = sizeof(struct nft_data);
2633 } else if (flags & NFT_SET_MAP)
2636 policy = NFT_SET_POL_PERFORMANCE;
2637 if (nla[NFTA_SET_POLICY] != NULL)
2638 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2640 if (nla[NFTA_SET_DESC] != NULL) {
2641 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2646 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2648 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2650 return PTR_ERR(afi);
2652 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2654 return PTR_ERR(table);
2656 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2658 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2660 if (PTR_ERR(set) != -ENOENT)
2661 return PTR_ERR(set);
2666 if (nlh->nlmsg_flags & NLM_F_EXCL)
2668 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2673 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2676 ops = nft_select_set_ops(nla, &desc, policy);
2678 return PTR_ERR(ops);
2681 if (ops->privsize != NULL)
2682 size = ops->privsize(nla);
2685 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2689 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2690 err = nf_tables_set_alloc_name(&ctx, set, name);
2694 INIT_LIST_HEAD(&set->bindings);
2697 set->klen = desc.klen;
2699 set->dlen = desc.dlen;
2701 set->size = desc.size;
2702 set->policy = policy;
2704 err = ops->init(set, &desc, nla);
2708 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2712 list_add_tail_rcu(&set->list, &table->sets);
2719 module_put(ops->owner);
2723 static void nft_set_destroy(struct nft_set *set)
2725 set->ops->destroy(set);
2726 module_put(set->ops->owner);
2730 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2732 list_del_rcu(&set->list);
2733 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2734 nft_set_destroy(set);
2737 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2738 const struct nlmsghdr *nlh,
2739 const struct nlattr * const nla[])
2741 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2742 struct nft_set *set;
2746 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2747 return -EAFNOSUPPORT;
2748 if (nla[NFTA_SET_TABLE] == NULL)
2751 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2755 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2757 return PTR_ERR(set);
2758 if (set->flags & NFT_SET_INACTIVE)
2760 if (!list_empty(&set->bindings))
2763 return nft_delset(&ctx, set);
2766 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2767 const struct nft_set *set,
2768 const struct nft_set_iter *iter,
2769 const struct nft_set_elem *elem)
2771 enum nft_registers dreg;
2773 dreg = nft_type_to_reg(set->dtype);
2774 return nft_validate_data_load(ctx, dreg, &elem->data,
2775 set->dtype == NFT_DATA_VERDICT ?
2776 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2779 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2780 struct nft_set_binding *binding)
2782 struct nft_set_binding *i;
2783 struct nft_set_iter iter;
2785 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2788 if (set->flags & NFT_SET_MAP) {
2789 /* If the set is already bound to the same chain all
2790 * jumps are already validated for that chain.
2792 list_for_each_entry(i, &set->bindings, list) {
2793 if (i->chain == binding->chain)
2800 iter.fn = nf_tables_bind_check_setelem;
2802 set->ops->walk(ctx, set, &iter);
2804 /* Destroy anonymous sets if binding fails */
2805 if (set->flags & NFT_SET_ANONYMOUS)
2806 nf_tables_set_destroy(ctx, set);
2812 binding->chain = ctx->chain;
2813 list_add_tail_rcu(&binding->list, &set->bindings);
2817 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2818 struct nft_set_binding *binding)
2820 list_del_rcu(&binding->list);
2822 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2823 !(set->flags & NFT_SET_INACTIVE))
2824 nf_tables_set_destroy(ctx, set);
2831 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2832 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2833 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2834 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2837 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2838 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2839 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2840 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2841 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2844 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2845 const struct sk_buff *skb,
2846 const struct nlmsghdr *nlh,
2847 const struct nlattr * const nla[],
2850 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2851 struct nft_af_info *afi;
2852 struct nft_table *table;
2853 struct net *net = sock_net(skb->sk);
2855 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2857 return PTR_ERR(afi);
2859 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2861 return PTR_ERR(table);
2862 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2865 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2869 static int nf_tables_fill_setelem(struct sk_buff *skb,
2870 const struct nft_set *set,
2871 const struct nft_set_elem *elem)
2873 unsigned char *b = skb_tail_pointer(skb);
2874 struct nlattr *nest;
2876 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2878 goto nla_put_failure;
2880 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2882 goto nla_put_failure;
2884 if (set->flags & NFT_SET_MAP &&
2885 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2886 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2887 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2889 goto nla_put_failure;
2891 if (elem->flags != 0)
2892 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2893 goto nla_put_failure;
2895 nla_nest_end(skb, nest);
2903 struct nft_set_dump_args {
2904 const struct netlink_callback *cb;
2905 struct nft_set_iter iter;
2906 struct sk_buff *skb;
2909 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2910 const struct nft_set *set,
2911 const struct nft_set_iter *iter,
2912 const struct nft_set_elem *elem)
2914 struct nft_set_dump_args *args;
2916 args = container_of(iter, struct nft_set_dump_args, iter);
2917 return nf_tables_fill_setelem(args->skb, set, elem);
2920 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2922 const struct nft_set *set;
2923 struct nft_set_dump_args args;
2925 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2926 struct nfgenmsg *nfmsg;
2927 struct nlmsghdr *nlh;
2928 struct nlattr *nest;
2932 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2933 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2937 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
2942 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2944 return PTR_ERR(set);
2945 if (set->flags & NFT_SET_INACTIVE)
2948 event = NFT_MSG_NEWSETELEM;
2949 event |= NFNL_SUBSYS_NFTABLES << 8;
2950 portid = NETLINK_CB(cb->skb).portid;
2951 seq = cb->nlh->nlmsg_seq;
2953 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2956 goto nla_put_failure;
2958 nfmsg = nlmsg_data(nlh);
2959 nfmsg->nfgen_family = ctx.afi->family;
2960 nfmsg->version = NFNETLINK_V0;
2961 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
2963 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2964 goto nla_put_failure;
2965 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2966 goto nla_put_failure;
2968 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2970 goto nla_put_failure;
2974 args.iter.skip = cb->args[0];
2975 args.iter.count = 0;
2977 args.iter.fn = nf_tables_dump_setelem;
2978 set->ops->walk(&ctx, set, &args.iter);
2980 nla_nest_end(skb, nest);
2981 nlmsg_end(skb, nlh);
2983 if (args.iter.err && args.iter.err != -EMSGSIZE)
2984 return args.iter.err;
2985 if (args.iter.count == cb->args[0])
2988 cb->args[0] = args.iter.count;
2995 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2996 const struct nlmsghdr *nlh,
2997 const struct nlattr * const nla[])
2999 const struct nft_set *set;
3003 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3007 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3009 return PTR_ERR(set);
3010 if (set->flags & NFT_SET_INACTIVE)
3013 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3014 struct netlink_dump_control c = {
3015 .dump = nf_tables_dump_set,
3017 return netlink_dump_start(nlsk, skb, nlh, &c);
3022 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3023 const struct nft_ctx *ctx, u32 seq,
3024 u32 portid, int event, u16 flags,
3025 const struct nft_set *set,
3026 const struct nft_set_elem *elem)
3028 struct nfgenmsg *nfmsg;
3029 struct nlmsghdr *nlh;
3030 struct nlattr *nest;
3033 event |= NFNL_SUBSYS_NFTABLES << 8;
3034 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3037 goto nla_put_failure;
3039 nfmsg = nlmsg_data(nlh);
3040 nfmsg->nfgen_family = ctx->afi->family;
3041 nfmsg->version = NFNETLINK_V0;
3042 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3044 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3045 goto nla_put_failure;
3046 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3047 goto nla_put_failure;
3049 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3051 goto nla_put_failure;
3053 err = nf_tables_fill_setelem(skb, set, elem);
3055 goto nla_put_failure;
3057 nla_nest_end(skb, nest);
3059 nlmsg_end(skb, nlh);
3063 nlmsg_trim(skb, nlh);
3067 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3068 const struct nft_set *set,
3069 const struct nft_set_elem *elem,
3070 int event, u16 flags)
3072 struct net *net = ctx->net;
3073 u32 portid = ctx->portid;
3074 struct sk_buff *skb;
3077 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3081 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3085 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3092 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3096 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3100 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3102 struct nft_set *set)
3104 struct nft_trans *trans;
3106 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3110 nft_trans_elem_set(trans) = set;
3114 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3115 const struct nlattr *attr)
3117 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3118 struct nft_data_desc d1, d2;
3119 struct nft_set_elem elem;
3120 struct nft_set_binding *binding;
3121 enum nft_registers dreg;
3122 struct nft_trans *trans;
3125 if (set->size && set->nelems == set->size)
3128 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3129 nft_set_elem_policy);
3133 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3137 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3138 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3139 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
3143 if (set->flags & NFT_SET_MAP) {
3144 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3145 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
3147 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3148 elem.flags & NFT_SET_ELEM_INTERVAL_END)
3151 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3155 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3159 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3163 if (set->ops->get(set, &elem) == 0)
3166 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3167 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
3172 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3175 dreg = nft_type_to_reg(set->dtype);
3176 list_for_each_entry(binding, &set->bindings, list) {
3177 struct nft_ctx bind_ctx = {
3179 .table = ctx->table,
3180 .chain = (struct nft_chain *)binding->chain,
3183 err = nft_validate_data_load(&bind_ctx, dreg,
3184 &elem.data, d2.type);
3190 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3194 err = set->ops->insert(set, &elem);
3198 nft_trans_elem(trans) = elem;
3199 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3205 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3206 nft_data_uninit(&elem.data, d2.type);
3208 nft_data_uninit(&elem.key, d1.type);
3213 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3214 const struct nlmsghdr *nlh,
3215 const struct nlattr * const nla[])
3217 struct net *net = sock_net(skb->sk);
3218 const struct nlattr *attr;
3219 struct nft_set *set;
3223 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3226 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3230 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3232 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3233 set = nf_tables_set_lookup_byid(net,
3234 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3237 return PTR_ERR(set);
3240 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3243 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3244 err = nft_add_set_elem(&ctx, set, attr);
3253 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3254 const struct nlattr *attr)
3256 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3257 struct nft_data_desc desc;
3258 struct nft_set_elem elem;
3259 struct nft_trans *trans;
3262 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3263 nft_set_elem_policy);
3268 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3271 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3276 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3279 err = set->ops->get(set, &elem);
3283 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3284 if (trans == NULL) {
3289 nft_trans_elem(trans) = elem;
3290 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3293 nft_data_uninit(&elem.key, desc.type);
3298 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3299 const struct nlmsghdr *nlh,
3300 const struct nlattr * const nla[])
3302 const struct nlattr *attr;
3303 struct nft_set *set;
3307 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3310 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3314 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3316 return PTR_ERR(set);
3317 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3320 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3321 err = nft_del_setelem(&ctx, set, attr);
3330 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3331 u32 portid, u32 seq)
3333 struct nlmsghdr *nlh;
3334 struct nfgenmsg *nfmsg;
3335 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3337 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3339 goto nla_put_failure;
3341 nfmsg = nlmsg_data(nlh);
3342 nfmsg->nfgen_family = AF_UNSPEC;
3343 nfmsg->version = NFNETLINK_V0;
3344 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3346 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3347 goto nla_put_failure;
3349 nlmsg_end(skb, nlh);
3353 nlmsg_trim(skb, nlh);
3357 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3359 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3360 struct sk_buff *skb2;
3363 if (nlmsg_report(nlh) &&
3364 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3368 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3372 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3379 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3380 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3383 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3389 static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb,
3390 const struct nlmsghdr *nlh,
3391 const struct nlattr * const nla[])
3393 struct net *net = sock_net(skb->sk);
3394 struct sk_buff *skb2;
3397 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3401 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3406 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3412 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3413 [NFT_MSG_NEWTABLE] = {
3414 .call_batch = nf_tables_newtable,
3415 .attr_count = NFTA_TABLE_MAX,
3416 .policy = nft_table_policy,
3418 [NFT_MSG_GETTABLE] = {
3419 .call = nf_tables_gettable,
3420 .attr_count = NFTA_TABLE_MAX,
3421 .policy = nft_table_policy,
3423 [NFT_MSG_DELTABLE] = {
3424 .call_batch = nf_tables_deltable,
3425 .attr_count = NFTA_TABLE_MAX,
3426 .policy = nft_table_policy,
3428 [NFT_MSG_NEWCHAIN] = {
3429 .call_batch = nf_tables_newchain,
3430 .attr_count = NFTA_CHAIN_MAX,
3431 .policy = nft_chain_policy,
3433 [NFT_MSG_GETCHAIN] = {
3434 .call = nf_tables_getchain,
3435 .attr_count = NFTA_CHAIN_MAX,
3436 .policy = nft_chain_policy,
3438 [NFT_MSG_DELCHAIN] = {
3439 .call_batch = nf_tables_delchain,
3440 .attr_count = NFTA_CHAIN_MAX,
3441 .policy = nft_chain_policy,
3443 [NFT_MSG_NEWRULE] = {
3444 .call_batch = nf_tables_newrule,
3445 .attr_count = NFTA_RULE_MAX,
3446 .policy = nft_rule_policy,
3448 [NFT_MSG_GETRULE] = {
3449 .call = nf_tables_getrule,
3450 .attr_count = NFTA_RULE_MAX,
3451 .policy = nft_rule_policy,
3453 [NFT_MSG_DELRULE] = {
3454 .call_batch = nf_tables_delrule,
3455 .attr_count = NFTA_RULE_MAX,
3456 .policy = nft_rule_policy,
3458 [NFT_MSG_NEWSET] = {
3459 .call_batch = nf_tables_newset,
3460 .attr_count = NFTA_SET_MAX,
3461 .policy = nft_set_policy,
3463 [NFT_MSG_GETSET] = {
3464 .call = nf_tables_getset,
3465 .attr_count = NFTA_SET_MAX,
3466 .policy = nft_set_policy,
3468 [NFT_MSG_DELSET] = {
3469 .call_batch = nf_tables_delset,
3470 .attr_count = NFTA_SET_MAX,
3471 .policy = nft_set_policy,
3473 [NFT_MSG_NEWSETELEM] = {
3474 .call_batch = nf_tables_newsetelem,
3475 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3476 .policy = nft_set_elem_list_policy,
3478 [NFT_MSG_GETSETELEM] = {
3479 .call = nf_tables_getsetelem,
3480 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3481 .policy = nft_set_elem_list_policy,
3483 [NFT_MSG_DELSETELEM] = {
3484 .call_batch = nf_tables_delsetelem,
3485 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3486 .policy = nft_set_elem_list_policy,
3488 [NFT_MSG_GETGEN] = {
3489 .call = nf_tables_getgen,
3493 static void nft_chain_commit_update(struct nft_trans *trans)
3495 struct nft_base_chain *basechain;
3497 if (nft_trans_chain_name(trans)[0])
3498 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3500 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3503 basechain = nft_base_chain(trans->ctx.chain);
3504 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3506 switch (nft_trans_chain_policy(trans)) {
3509 basechain->policy = nft_trans_chain_policy(trans);
3514 static void nf_tables_commit_release(struct nft_trans *trans)
3516 switch (trans->msg_type) {
3517 case NFT_MSG_DELTABLE:
3518 nf_tables_table_destroy(&trans->ctx);
3520 case NFT_MSG_DELCHAIN:
3521 nf_tables_chain_destroy(trans->ctx.chain);
3523 case NFT_MSG_DELRULE:
3524 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3526 case NFT_MSG_DELSET:
3527 nft_set_destroy(nft_trans_set(trans));
3533 static int nf_tables_commit(struct sk_buff *skb)
3535 struct net *net = sock_net(skb->sk);
3536 struct nft_trans *trans, *next;
3537 struct nft_trans_elem *te;
3539 /* Bump generation counter, invalidate any dump in progress */
3540 while (++net->nft.base_seq == 0);
3542 /* A new generation has just started */
3543 net->nft.gencursor = gencursor_next(net);
3545 /* Make sure all packets have left the previous generation before
3546 * purging old rules.
3550 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3551 switch (trans->msg_type) {
3552 case NFT_MSG_NEWTABLE:
3553 if (nft_trans_table_update(trans)) {
3554 if (!nft_trans_table_enable(trans)) {
3555 nf_tables_table_disable(trans->ctx.afi,
3557 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3560 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3562 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3563 nft_trans_destroy(trans);
3565 case NFT_MSG_DELTABLE:
3566 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3568 case NFT_MSG_NEWCHAIN:
3569 if (nft_trans_chain_update(trans))
3570 nft_chain_commit_update(trans);
3572 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3574 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3575 nft_trans_destroy(trans);
3577 case NFT_MSG_DELCHAIN:
3578 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3579 nf_tables_unregister_hooks(trans->ctx.table,
3581 trans->ctx.afi->nops);
3583 case NFT_MSG_NEWRULE:
3584 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3585 nf_tables_rule_notify(&trans->ctx,
3586 nft_trans_rule(trans),
3588 nft_trans_destroy(trans);
3590 case NFT_MSG_DELRULE:
3591 list_del_rcu(&nft_trans_rule(trans)->list);
3592 nf_tables_rule_notify(&trans->ctx,
3593 nft_trans_rule(trans),
3596 case NFT_MSG_NEWSET:
3597 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3598 /* This avoids hitting -EBUSY when deleting the table
3599 * from the transaction.
3601 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3602 !list_empty(&nft_trans_set(trans)->bindings))
3603 trans->ctx.table->use--;
3605 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3606 NFT_MSG_NEWSET, GFP_KERNEL);
3607 nft_trans_destroy(trans);
3609 case NFT_MSG_DELSET:
3610 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3611 NFT_MSG_DELSET, GFP_KERNEL);
3613 case NFT_MSG_NEWSETELEM:
3614 nf_tables_setelem_notify(&trans->ctx,
3615 nft_trans_elem_set(trans),
3616 &nft_trans_elem(trans),
3617 NFT_MSG_NEWSETELEM, 0);
3618 nft_trans_destroy(trans);
3620 case NFT_MSG_DELSETELEM:
3621 te = (struct nft_trans_elem *)trans->data;
3622 nf_tables_setelem_notify(&trans->ctx, te->set,
3624 NFT_MSG_DELSETELEM, 0);
3625 te->set->ops->get(te->set, &te->elem);
3626 nft_data_uninit(&te->elem.key, NFT_DATA_VALUE);
3627 if (te->set->flags & NFT_SET_MAP &&
3628 !(te->elem.flags & NFT_SET_ELEM_INTERVAL_END))
3629 nft_data_uninit(&te->elem.data, te->set->dtype);
3630 te->set->ops->remove(te->set, &te->elem);
3631 nft_trans_destroy(trans);
3638 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3639 list_del(&trans->list);
3640 nf_tables_commit_release(trans);
3643 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
3648 static void nf_tables_abort_release(struct nft_trans *trans)
3650 switch (trans->msg_type) {
3651 case NFT_MSG_NEWTABLE:
3652 nf_tables_table_destroy(&trans->ctx);
3654 case NFT_MSG_NEWCHAIN:
3655 nf_tables_chain_destroy(trans->ctx.chain);
3657 case NFT_MSG_NEWRULE:
3658 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3660 case NFT_MSG_NEWSET:
3661 nft_set_destroy(nft_trans_set(trans));
3667 static int nf_tables_abort(struct sk_buff *skb)
3669 struct net *net = sock_net(skb->sk);
3670 struct nft_trans *trans, *next;
3671 struct nft_trans_elem *te;
3673 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3674 switch (trans->msg_type) {
3675 case NFT_MSG_NEWTABLE:
3676 if (nft_trans_table_update(trans)) {
3677 if (nft_trans_table_enable(trans)) {
3678 nf_tables_table_disable(trans->ctx.afi,
3680 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3682 nft_trans_destroy(trans);
3684 list_del_rcu(&trans->ctx.table->list);
3687 case NFT_MSG_DELTABLE:
3688 list_add_tail_rcu(&trans->ctx.table->list,
3689 &trans->ctx.afi->tables);
3690 nft_trans_destroy(trans);
3692 case NFT_MSG_NEWCHAIN:
3693 if (nft_trans_chain_update(trans)) {
3694 free_percpu(nft_trans_chain_stats(trans));
3696 nft_trans_destroy(trans);
3698 trans->ctx.table->use--;
3699 list_del_rcu(&trans->ctx.chain->list);
3700 nf_tables_unregister_hooks(trans->ctx.table,
3702 trans->ctx.afi->nops);
3705 case NFT_MSG_DELCHAIN:
3706 trans->ctx.table->use++;
3707 list_add_tail_rcu(&trans->ctx.chain->list,
3708 &trans->ctx.table->chains);
3709 nft_trans_destroy(trans);
3711 case NFT_MSG_NEWRULE:
3712 trans->ctx.chain->use--;
3713 list_del_rcu(&nft_trans_rule(trans)->list);
3715 case NFT_MSG_DELRULE:
3716 trans->ctx.chain->use++;
3717 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3718 nft_trans_destroy(trans);
3720 case NFT_MSG_NEWSET:
3721 trans->ctx.table->use--;
3722 list_del_rcu(&nft_trans_set(trans)->list);
3724 case NFT_MSG_DELSET:
3725 trans->ctx.table->use++;
3726 list_add_tail_rcu(&nft_trans_set(trans)->list,
3727 &trans->ctx.table->sets);
3728 nft_trans_destroy(trans);
3730 case NFT_MSG_NEWSETELEM:
3731 nft_trans_elem_set(trans)->nelems--;
3732 te = (struct nft_trans_elem *)trans->data;
3733 te->set->ops->get(te->set, &te->elem);
3734 nft_data_uninit(&te->elem.key, NFT_DATA_VALUE);
3735 if (te->set->flags & NFT_SET_MAP &&
3736 !(te->elem.flags & NFT_SET_ELEM_INTERVAL_END))
3737 nft_data_uninit(&te->elem.data, te->set->dtype);
3738 te->set->ops->remove(te->set, &te->elem);
3739 nft_trans_destroy(trans);
3741 case NFT_MSG_DELSETELEM:
3742 nft_trans_elem_set(trans)->nelems++;
3743 nft_trans_destroy(trans);
3750 list_for_each_entry_safe_reverse(trans, next,
3751 &net->nft.commit_list, list) {
3752 list_del(&trans->list);
3753 nf_tables_abort_release(trans);
3759 static const struct nfnetlink_subsystem nf_tables_subsys = {
3760 .name = "nf_tables",
3761 .subsys_id = NFNL_SUBSYS_NFTABLES,
3762 .cb_count = NFT_MSG_MAX,
3764 .commit = nf_tables_commit,
3765 .abort = nf_tables_abort,
3768 int nft_chain_validate_dependency(const struct nft_chain *chain,
3769 enum nft_chain_type type)
3771 const struct nft_base_chain *basechain;
3773 if (chain->flags & NFT_BASE_CHAIN) {
3774 basechain = nft_base_chain(chain);
3775 if (basechain->type->type != type)
3780 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
3782 int nft_chain_validate_hooks(const struct nft_chain *chain,
3783 unsigned int hook_flags)
3785 struct nft_base_chain *basechain;
3787 if (chain->flags & NFT_BASE_CHAIN) {
3788 basechain = nft_base_chain(chain);
3790 if ((1 << basechain->ops[0].hooknum) & hook_flags)
3798 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
3801 * Loop detection - walk through the ruleset beginning at the destination chain
3802 * of a new jump until either the source chain is reached (loop) or all
3803 * reachable chains have been traversed.
3805 * The loop check is performed whenever a new jump verdict is added to an
3806 * expression or verdict map or a verdict map is bound to a new chain.
3809 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3810 const struct nft_chain *chain);
3812 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3813 const struct nft_set *set,
3814 const struct nft_set_iter *iter,
3815 const struct nft_set_elem *elem)
3817 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3820 switch (elem->data.verdict) {
3823 return nf_tables_check_loops(ctx, elem->data.chain);
3829 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3830 const struct nft_chain *chain)
3832 const struct nft_rule *rule;
3833 const struct nft_expr *expr, *last;
3834 const struct nft_set *set;
3835 struct nft_set_binding *binding;
3836 struct nft_set_iter iter;
3838 if (ctx->chain == chain)
3841 list_for_each_entry(rule, &chain->rules, list) {
3842 nft_rule_for_each_expr(expr, last, rule) {
3843 const struct nft_data *data = NULL;
3846 if (!expr->ops->validate)
3849 err = expr->ops->validate(ctx, expr, &data);
3856 switch (data->verdict) {
3859 err = nf_tables_check_loops(ctx, data->chain);
3868 list_for_each_entry(set, &ctx->table->sets, list) {
3869 if (!(set->flags & NFT_SET_MAP) ||
3870 set->dtype != NFT_DATA_VERDICT)
3873 list_for_each_entry(binding, &set->bindings, list) {
3874 if (binding->chain != chain)
3880 iter.fn = nf_tables_loop_check_setelem;
3882 set->ops->walk(ctx, set, &iter);
3892 * nft_validate_input_register - validate an expressions' input register
3894 * @reg: the register number
3896 * Validate that the input register is one of the general purpose
3899 int nft_validate_input_register(enum nft_registers reg)
3901 if (reg <= NFT_REG_VERDICT)
3903 if (reg > NFT_REG_MAX)
3907 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3910 * nft_validate_output_register - validate an expressions' output register
3912 * @reg: the register number
3914 * Validate that the output register is one of the general purpose
3915 * registers or the verdict register.
3917 int nft_validate_output_register(enum nft_registers reg)
3919 if (reg < NFT_REG_VERDICT)
3921 if (reg > NFT_REG_MAX)
3925 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3928 * nft_validate_data_load - validate an expressions' data load
3930 * @ctx: context of the expression performing the load
3931 * @reg: the destination register number
3932 * @data: the data to load
3933 * @type: the data type
3935 * Validate that a data load uses the appropriate data type for
3936 * the destination register. A value of NULL for the data means
3937 * that its runtime gathered data, which is always of type
3940 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3941 const struct nft_data *data,
3942 enum nft_data_types type)
3947 case NFT_REG_VERDICT:
3948 if (data == NULL || type != NFT_DATA_VERDICT)
3951 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3952 err = nf_tables_check_loops(ctx, data->chain);
3956 if (ctx->chain->level + 1 > data->chain->level) {
3957 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3959 data->chain->level = ctx->chain->level + 1;
3965 if (data != NULL && type != NFT_DATA_VALUE)
3970 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3972 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3973 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3974 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3975 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3978 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3979 struct nft_data_desc *desc, const struct nlattr *nla)
3981 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3982 struct nft_chain *chain;
3985 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3989 if (!tb[NFTA_VERDICT_CODE])
3991 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3993 switch (data->verdict) {
3995 switch (data->verdict & NF_VERDICT_MASK) {
4007 desc->len = sizeof(data->verdict);
4011 if (!tb[NFTA_VERDICT_CHAIN])
4013 chain = nf_tables_chain_lookup(ctx->table,
4014 tb[NFTA_VERDICT_CHAIN]);
4016 return PTR_ERR(chain);
4017 if (chain->flags & NFT_BASE_CHAIN)
4021 data->chain = chain;
4022 desc->len = sizeof(data);
4026 desc->type = NFT_DATA_VERDICT;
4030 static void nft_verdict_uninit(const struct nft_data *data)
4032 switch (data->verdict) {
4040 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
4042 struct nlattr *nest;
4044 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
4046 goto nla_put_failure;
4048 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
4049 goto nla_put_failure;
4051 switch (data->verdict) {
4054 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
4055 goto nla_put_failure;
4057 nla_nest_end(skb, nest);
4064 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
4065 struct nft_data_desc *desc, const struct nlattr *nla)
4072 if (len > sizeof(data->data))
4075 nla_memcpy(data->data, nla, sizeof(data->data));
4076 desc->type = NFT_DATA_VALUE;
4081 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4084 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4087 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4088 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
4089 .len = FIELD_SIZEOF(struct nft_data, data) },
4090 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4094 * nft_data_init - parse nf_tables data netlink attributes
4096 * @ctx: context of the expression using the data
4097 * @data: destination struct nft_data
4098 * @desc: data description
4099 * @nla: netlink attribute containing data
4101 * Parse the netlink data attributes and initialize a struct nft_data.
4102 * The type and length of data are returned in the data description.
4104 * The caller can indicate that it only wants to accept data of type
4105 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4107 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
4108 struct nft_data_desc *desc, const struct nlattr *nla)
4110 struct nlattr *tb[NFTA_DATA_MAX + 1];
4113 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4117 if (tb[NFTA_DATA_VALUE])
4118 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
4119 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4120 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4123 EXPORT_SYMBOL_GPL(nft_data_init);
4126 * nft_data_uninit - release a nft_data item
4128 * @data: struct nft_data to release
4129 * @type: type of data
4131 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4132 * all others need to be released by calling this function.
4134 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4137 case NFT_DATA_VALUE:
4139 case NFT_DATA_VERDICT:
4140 return nft_verdict_uninit(data);
4145 EXPORT_SYMBOL_GPL(nft_data_uninit);
4147 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4148 enum nft_data_types type, unsigned int len)
4150 struct nlattr *nest;
4153 nest = nla_nest_start(skb, attr);
4158 case NFT_DATA_VALUE:
4159 err = nft_value_dump(skb, data, len);
4161 case NFT_DATA_VERDICT:
4162 err = nft_verdict_dump(skb, data);
4169 nla_nest_end(skb, nest);
4172 EXPORT_SYMBOL_GPL(nft_data_dump);
4174 static int nf_tables_init_net(struct net *net)
4176 INIT_LIST_HEAD(&net->nft.af_info);
4177 INIT_LIST_HEAD(&net->nft.commit_list);
4178 net->nft.base_seq = 1;
4182 static struct pernet_operations nf_tables_net_ops = {
4183 .init = nf_tables_init_net,
4186 static int __init nf_tables_module_init(void)
4190 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4197 err = nf_tables_core_module_init();
4201 err = nfnetlink_subsys_register(&nf_tables_subsys);
4205 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4206 return register_pernet_subsys(&nf_tables_net_ops);
4208 nf_tables_core_module_exit();
4215 static void __exit nf_tables_module_exit(void)
4217 unregister_pernet_subsys(&nf_tables_net_ops);
4218 nfnetlink_subsys_unregister(&nf_tables_subsys);
4220 nf_tables_core_module_exit();
4224 module_init(nf_tables_module_init);
4225 module_exit(nf_tables_module_exit);
4227 MODULE_LICENSE("GPL");
4228 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4229 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);