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 & nft_genmask_cur(net)) == 0;
205 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
207 return (rule->genmask & nft_genmask_next(net)) == 0;
211 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
213 /* Now inactive, will be active in the future */
214 rule->genmask = nft_genmask_cur(net);
218 nft_rule_deactivate_next(struct net *net, struct nft_rule *rule)
220 rule->genmask = nft_genmask_next(net);
223 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
225 rule->genmask &= ~nft_genmask_next(net);
229 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
231 /* You cannot delete the same rule twice */
232 if (nft_rule_is_active_next(ctx->net, rule)) {
233 nft_rule_deactivate_next(ctx->net, rule);
240 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
241 struct nft_rule *rule)
243 struct nft_trans *trans;
245 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
249 nft_trans_rule(trans) = rule;
250 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
255 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
257 struct nft_trans *trans;
260 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
264 err = nf_tables_delrule_deactivate(ctx, rule);
266 nft_trans_destroy(trans);
273 static int nft_delrule_by_chain(struct nft_ctx *ctx)
275 struct nft_rule *rule;
278 list_for_each_entry(rule, &ctx->chain->rules, list) {
279 err = nft_delrule(ctx, rule);
286 /* Internal set flag */
287 #define NFT_SET_INACTIVE (1 << 15)
289 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
292 struct nft_trans *trans;
294 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
298 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
299 nft_trans_set_id(trans) =
300 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
301 set->flags |= NFT_SET_INACTIVE;
303 nft_trans_set(trans) = set;
304 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
309 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
313 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
317 list_del_rcu(&set->list);
327 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
328 const struct nlattr *nla)
330 struct nft_table *table;
332 list_for_each_entry(table, &afi->tables, list) {
333 if (!nla_strcmp(nla, table->name))
339 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
340 const struct nlattr *nla)
342 struct nft_table *table;
345 return ERR_PTR(-EINVAL);
347 table = nft_table_lookup(afi, nla);
351 return ERR_PTR(-ENOENT);
354 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
356 return ++table->hgenerator;
359 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
361 static const struct nf_chain_type *
362 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
366 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
367 if (chain_type[family][i] != NULL &&
368 !nla_strcmp(nla, chain_type[family][i]->name))
369 return chain_type[family][i];
374 static const struct nf_chain_type *
375 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
376 const struct nlattr *nla,
379 const struct nf_chain_type *type;
381 type = __nf_tables_chain_type_lookup(afi->family, nla);
384 #ifdef CONFIG_MODULES
386 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
387 request_module("nft-chain-%u-%.*s", afi->family,
388 nla_len(nla), (const char *)nla_data(nla));
389 nfnl_lock(NFNL_SUBSYS_NFTABLES);
390 type = __nf_tables_chain_type_lookup(afi->family, nla);
392 return ERR_PTR(-EAGAIN);
395 return ERR_PTR(-ENOENT);
398 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
399 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
400 .len = NFT_TABLE_MAXNAMELEN - 1 },
401 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
404 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
405 u32 portid, u32 seq, int event, u32 flags,
406 int family, const struct nft_table *table)
408 struct nlmsghdr *nlh;
409 struct nfgenmsg *nfmsg;
411 event |= NFNL_SUBSYS_NFTABLES << 8;
412 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
414 goto nla_put_failure;
416 nfmsg = nlmsg_data(nlh);
417 nfmsg->nfgen_family = family;
418 nfmsg->version = NFNETLINK_V0;
419 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
421 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
422 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
423 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
424 goto nla_put_failure;
430 nlmsg_trim(skb, nlh);
434 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
440 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
444 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
448 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
449 event, 0, ctx->afi->family, ctx->table);
455 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
456 ctx->report, GFP_KERNEL);
459 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
465 static int nf_tables_dump_tables(struct sk_buff *skb,
466 struct netlink_callback *cb)
468 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
469 const struct nft_af_info *afi;
470 const struct nft_table *table;
471 unsigned int idx = 0, s_idx = cb->args[0];
472 struct net *net = sock_net(skb->sk);
473 int family = nfmsg->nfgen_family;
476 cb->seq = net->nft.base_seq;
478 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
479 if (family != NFPROTO_UNSPEC && family != afi->family)
482 list_for_each_entry_rcu(table, &afi->tables, list) {
486 memset(&cb->args[1], 0,
487 sizeof(cb->args) - sizeof(cb->args[0]));
488 if (nf_tables_fill_table_info(skb, net,
489 NETLINK_CB(cb->skb).portid,
493 afi->family, table) < 0)
496 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
507 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
508 const struct nlmsghdr *nlh,
509 const struct nlattr * const nla[])
511 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
512 const struct nft_af_info *afi;
513 const struct nft_table *table;
514 struct sk_buff *skb2;
515 struct net *net = sock_net(skb->sk);
516 int family = nfmsg->nfgen_family;
519 if (nlh->nlmsg_flags & NLM_F_DUMP) {
520 struct netlink_dump_control c = {
521 .dump = nf_tables_dump_tables,
523 return netlink_dump_start(nlsk, skb, nlh, &c);
526 afi = nf_tables_afinfo_lookup(net, family, false);
530 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
532 return PTR_ERR(table);
533 if (table->flags & NFT_TABLE_INACTIVE)
536 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
540 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
541 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
546 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
553 static int nf_tables_table_enable(const struct nft_af_info *afi,
554 struct nft_table *table)
556 struct nft_chain *chain;
559 list_for_each_entry(chain, &table->chains, list) {
560 if (!(chain->flags & NFT_BASE_CHAIN))
563 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
571 list_for_each_entry(chain, &table->chains, list) {
572 if (!(chain->flags & NFT_BASE_CHAIN))
578 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
583 static void nf_tables_table_disable(const struct nft_af_info *afi,
584 struct nft_table *table)
586 struct nft_chain *chain;
588 list_for_each_entry(chain, &table->chains, list) {
589 if (chain->flags & NFT_BASE_CHAIN)
590 nf_unregister_hooks(nft_base_chain(chain)->ops,
595 static int nf_tables_updtable(struct nft_ctx *ctx)
597 struct nft_trans *trans;
601 if (!ctx->nla[NFTA_TABLE_FLAGS])
604 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
605 if (flags & ~NFT_TABLE_F_DORMANT)
608 if (flags == ctx->table->flags)
611 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
612 sizeof(struct nft_trans_table));
616 if ((flags & NFT_TABLE_F_DORMANT) &&
617 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
618 nft_trans_table_enable(trans) = false;
619 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
620 ctx->table->flags & NFT_TABLE_F_DORMANT) {
621 ret = nf_tables_table_enable(ctx->afi, ctx->table);
623 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
624 nft_trans_table_enable(trans) = true;
630 nft_trans_table_update(trans) = true;
631 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
634 nft_trans_destroy(trans);
638 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
639 const struct nlmsghdr *nlh,
640 const struct nlattr * const nla[])
642 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
643 const struct nlattr *name;
644 struct nft_af_info *afi;
645 struct nft_table *table;
646 struct net *net = sock_net(skb->sk);
647 int family = nfmsg->nfgen_family;
652 afi = nf_tables_afinfo_lookup(net, family, true);
656 name = nla[NFTA_TABLE_NAME];
657 table = nf_tables_table_lookup(afi, name);
659 if (PTR_ERR(table) != -ENOENT)
660 return PTR_ERR(table);
665 if (table->flags & NFT_TABLE_INACTIVE)
667 if (nlh->nlmsg_flags & NLM_F_EXCL)
669 if (nlh->nlmsg_flags & NLM_F_REPLACE)
672 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
673 return nf_tables_updtable(&ctx);
676 if (nla[NFTA_TABLE_FLAGS]) {
677 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
678 if (flags & ~NFT_TABLE_F_DORMANT)
682 if (!try_module_get(afi->owner))
683 return -EAFNOSUPPORT;
686 table = kzalloc(sizeof(*table), GFP_KERNEL);
690 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
691 INIT_LIST_HEAD(&table->chains);
692 INIT_LIST_HEAD(&table->sets);
693 table->flags = flags;
695 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
696 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
700 list_add_tail_rcu(&table->list, &afi->tables);
705 module_put(afi->owner);
709 static int nft_flush_table(struct nft_ctx *ctx)
712 struct nft_chain *chain, *nc;
713 struct nft_set *set, *ns;
715 list_for_each_entry(chain, &ctx->table->chains, list) {
718 err = nft_delrule_by_chain(ctx);
723 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
724 if (set->flags & NFT_SET_ANONYMOUS &&
725 !list_empty(&set->bindings))
728 err = nft_delset(ctx, set);
733 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
736 err = nft_delchain(ctx);
741 err = nft_deltable(ctx);
746 static int nft_flush(struct nft_ctx *ctx, int family)
748 struct nft_af_info *afi;
749 struct nft_table *table, *nt;
750 const struct nlattr * const *nla = ctx->nla;
753 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
754 if (family != AF_UNSPEC && afi->family != family)
758 list_for_each_entry_safe(table, nt, &afi->tables, list) {
759 if (nla[NFTA_TABLE_NAME] &&
760 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
765 err = nft_flush_table(ctx);
774 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
775 const struct nlmsghdr *nlh,
776 const struct nlattr * const nla[])
778 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
779 struct nft_af_info *afi;
780 struct nft_table *table;
781 struct net *net = sock_net(skb->sk);
782 int family = nfmsg->nfgen_family;
785 nft_ctx_init(&ctx, skb, nlh, NULL, NULL, NULL, nla);
786 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
787 return nft_flush(&ctx, family);
789 afi = nf_tables_afinfo_lookup(net, family, false);
793 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
795 return PTR_ERR(table);
796 if (table->flags & NFT_TABLE_INACTIVE)
802 return nft_flush_table(&ctx);
805 static void nf_tables_table_destroy(struct nft_ctx *ctx)
807 BUG_ON(ctx->table->use > 0);
810 module_put(ctx->afi->owner);
813 int nft_register_chain_type(const struct nf_chain_type *ctype)
817 nfnl_lock(NFNL_SUBSYS_NFTABLES);
818 if (chain_type[ctype->family][ctype->type] != NULL) {
822 chain_type[ctype->family][ctype->type] = ctype;
824 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
827 EXPORT_SYMBOL_GPL(nft_register_chain_type);
829 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
831 nfnl_lock(NFNL_SUBSYS_NFTABLES);
832 chain_type[ctype->family][ctype->type] = NULL;
833 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
835 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
841 static struct nft_chain *
842 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
844 struct nft_chain *chain;
846 list_for_each_entry(chain, &table->chains, list) {
847 if (chain->handle == handle)
851 return ERR_PTR(-ENOENT);
854 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
855 const struct nlattr *nla)
857 struct nft_chain *chain;
860 return ERR_PTR(-EINVAL);
862 list_for_each_entry(chain, &table->chains, list) {
863 if (!nla_strcmp(nla, chain->name))
867 return ERR_PTR(-ENOENT);
870 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
871 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
872 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
873 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
874 .len = NFT_CHAIN_MAXNAMELEN - 1 },
875 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
876 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
877 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
878 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
881 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
882 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
883 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
886 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
888 struct nft_stats *cpu_stats, total;
894 memset(&total, 0, sizeof(total));
895 for_each_possible_cpu(cpu) {
896 cpu_stats = per_cpu_ptr(stats, cpu);
898 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
899 pkts = cpu_stats->pkts;
900 bytes = cpu_stats->bytes;
901 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
903 total.bytes += bytes;
905 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
907 goto nla_put_failure;
909 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
910 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
911 goto nla_put_failure;
913 nla_nest_end(skb, nest);
920 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
921 u32 portid, u32 seq, int event, u32 flags,
922 int family, const struct nft_table *table,
923 const struct nft_chain *chain)
925 struct nlmsghdr *nlh;
926 struct nfgenmsg *nfmsg;
928 event |= NFNL_SUBSYS_NFTABLES << 8;
929 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
931 goto nla_put_failure;
933 nfmsg = nlmsg_data(nlh);
934 nfmsg->nfgen_family = family;
935 nfmsg->version = NFNETLINK_V0;
936 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
938 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
939 goto nla_put_failure;
940 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
941 goto nla_put_failure;
942 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
943 goto nla_put_failure;
945 if (chain->flags & NFT_BASE_CHAIN) {
946 const struct nft_base_chain *basechain = nft_base_chain(chain);
947 const struct nf_hook_ops *ops = &basechain->ops[0];
950 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
952 goto nla_put_failure;
953 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
954 goto nla_put_failure;
955 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
956 goto nla_put_failure;
957 nla_nest_end(skb, nest);
959 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
960 htonl(basechain->policy)))
961 goto nla_put_failure;
963 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
964 goto nla_put_failure;
966 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
967 goto nla_put_failure;
970 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
971 goto nla_put_failure;
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)))
1229 if (chain == NULL &&
1230 nla[NFTA_CHAIN_HOOK] == NULL)
1233 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1243 if (chain != NULL) {
1244 struct nft_stats *stats = NULL;
1245 struct nft_trans *trans;
1247 if (chain->flags & NFT_CHAIN_INACTIVE)
1249 if (nlh->nlmsg_flags & NLM_F_EXCL)
1251 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1254 if (nla[NFTA_CHAIN_HANDLE] && name &&
1255 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1258 if (nla[NFTA_CHAIN_COUNTERS]) {
1259 if (!(chain->flags & NFT_BASE_CHAIN))
1262 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1264 return PTR_ERR(stats);
1267 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1268 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1269 sizeof(struct nft_trans_chain));
1270 if (trans == NULL) {
1275 nft_trans_chain_stats(trans) = stats;
1276 nft_trans_chain_update(trans) = true;
1278 if (nla[NFTA_CHAIN_POLICY])
1279 nft_trans_chain_policy(trans) = policy;
1281 nft_trans_chain_policy(trans) = -1;
1283 if (nla[NFTA_CHAIN_HANDLE] && name) {
1284 nla_strlcpy(nft_trans_chain_name(trans), name,
1285 NFT_CHAIN_MAXNAMELEN);
1287 list_add_tail(&trans->list, &net->nft.commit_list);
1291 if (table->use == UINT_MAX)
1294 if (nla[NFTA_CHAIN_HOOK]) {
1295 const struct nf_chain_type *type;
1296 struct nf_hook_ops *ops;
1298 u32 hooknum, priority;
1300 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1301 if (nla[NFTA_CHAIN_TYPE]) {
1302 type = nf_tables_chain_type_lookup(afi,
1303 nla[NFTA_CHAIN_TYPE],
1306 return PTR_ERR(type);
1309 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1313 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1314 ha[NFTA_HOOK_PRIORITY] == NULL)
1317 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1318 if (hooknum >= afi->nhooks)
1320 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1322 if (!(type->hook_mask & (1 << hooknum)))
1324 if (!try_module_get(type->owner))
1326 hookfn = type->hooks[hooknum];
1328 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1329 if (basechain == NULL) {
1330 module_put(type->owner);
1334 if (nla[NFTA_CHAIN_COUNTERS]) {
1335 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1336 if (IS_ERR(stats)) {
1337 module_put(type->owner);
1339 return PTR_ERR(stats);
1341 basechain->stats = stats;
1343 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1344 if (stats == NULL) {
1345 module_put(type->owner);
1349 rcu_assign_pointer(basechain->stats, stats);
1352 write_pnet(&basechain->pnet, net);
1353 basechain->type = type;
1354 chain = &basechain->chain;
1356 for (i = 0; i < afi->nops; i++) {
1357 ops = &basechain->ops[i];
1359 ops->owner = afi->owner;
1360 ops->hooknum = hooknum;
1361 ops->priority = priority;
1363 ops->hook = afi->hooks[ops->hooknum];
1366 if (afi->hook_ops_init)
1367 afi->hook_ops_init(ops, i);
1370 chain->flags |= NFT_BASE_CHAIN;
1371 basechain->policy = policy;
1373 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1378 INIT_LIST_HEAD(&chain->rules);
1379 chain->handle = nf_tables_alloc_handle(table);
1380 chain->table = table;
1381 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1383 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1384 chain->flags & NFT_BASE_CHAIN) {
1385 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1390 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1391 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1396 list_add_tail_rcu(&chain->list, &table->chains);
1399 nf_tables_unregister_hooks(table, chain, afi->nops);
1401 nf_tables_chain_destroy(chain);
1405 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1406 const struct nlmsghdr *nlh,
1407 const struct nlattr * const nla[])
1409 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1410 struct nft_af_info *afi;
1411 struct nft_table *table;
1412 struct nft_chain *chain;
1413 struct net *net = sock_net(skb->sk);
1414 int family = nfmsg->nfgen_family;
1417 afi = nf_tables_afinfo_lookup(net, family, false);
1419 return PTR_ERR(afi);
1421 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1423 return PTR_ERR(table);
1424 if (table->flags & NFT_TABLE_INACTIVE)
1427 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1429 return PTR_ERR(chain);
1430 if (chain->flags & NFT_CHAIN_INACTIVE)
1435 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1437 return nft_delchain(&ctx);
1445 * nft_register_expr - register nf_tables expr type
1448 * Registers the expr type for use with nf_tables. Returns zero on
1449 * success or a negative errno code otherwise.
1451 int nft_register_expr(struct nft_expr_type *type)
1453 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1454 if (type->family == NFPROTO_UNSPEC)
1455 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1457 list_add_rcu(&type->list, &nf_tables_expressions);
1458 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1461 EXPORT_SYMBOL_GPL(nft_register_expr);
1464 * nft_unregister_expr - unregister nf_tables expr type
1467 * Unregisters the expr typefor use with nf_tables.
1469 void nft_unregister_expr(struct nft_expr_type *type)
1471 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1472 list_del_rcu(&type->list);
1473 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1475 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1477 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1480 const struct nft_expr_type *type;
1482 list_for_each_entry(type, &nf_tables_expressions, list) {
1483 if (!nla_strcmp(nla, type->name) &&
1484 (!type->family || type->family == family))
1490 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1493 const struct nft_expr_type *type;
1496 return ERR_PTR(-EINVAL);
1498 type = __nft_expr_type_get(family, nla);
1499 if (type != NULL && try_module_get(type->owner))
1502 #ifdef CONFIG_MODULES
1504 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1505 request_module("nft-expr-%u-%.*s", family,
1506 nla_len(nla), (char *)nla_data(nla));
1507 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1508 if (__nft_expr_type_get(family, nla))
1509 return ERR_PTR(-EAGAIN);
1511 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1512 request_module("nft-expr-%.*s",
1513 nla_len(nla), (char *)nla_data(nla));
1514 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1515 if (__nft_expr_type_get(family, nla))
1516 return ERR_PTR(-EAGAIN);
1519 return ERR_PTR(-ENOENT);
1522 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1523 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1524 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1527 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1528 const struct nft_expr *expr)
1530 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1531 goto nla_put_failure;
1533 if (expr->ops->dump) {
1534 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1536 goto nla_put_failure;
1537 if (expr->ops->dump(skb, expr) < 0)
1538 goto nla_put_failure;
1539 nla_nest_end(skb, data);
1548 struct nft_expr_info {
1549 const struct nft_expr_ops *ops;
1550 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1553 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1554 const struct nlattr *nla,
1555 struct nft_expr_info *info)
1557 const struct nft_expr_type *type;
1558 const struct nft_expr_ops *ops;
1559 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1562 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1566 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1568 return PTR_ERR(type);
1570 if (tb[NFTA_EXPR_DATA]) {
1571 err = nla_parse_nested(info->tb, type->maxattr,
1572 tb[NFTA_EXPR_DATA], type->policy);
1576 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1578 if (type->select_ops != NULL) {
1579 ops = type->select_ops(ctx,
1580 (const struct nlattr * const *)info->tb);
1592 module_put(type->owner);
1596 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1597 const struct nft_expr_info *info,
1598 struct nft_expr *expr)
1600 const struct nft_expr_ops *ops = info->ops;
1605 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1617 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1618 struct nft_expr *expr)
1620 if (expr->ops->destroy)
1621 expr->ops->destroy(ctx, expr);
1622 module_put(expr->ops->type->owner);
1629 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1632 struct nft_rule *rule;
1634 // FIXME: this sucks
1635 list_for_each_entry(rule, &chain->rules, list) {
1636 if (handle == rule->handle)
1640 return ERR_PTR(-ENOENT);
1643 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1644 const struct nlattr *nla)
1647 return ERR_PTR(-EINVAL);
1649 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1652 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1653 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1654 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1655 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1656 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1657 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1658 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1659 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1660 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1661 .len = NFT_USERDATA_MAXLEN },
1664 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1665 u32 portid, u32 seq, int event,
1666 u32 flags, int family,
1667 const struct nft_table *table,
1668 const struct nft_chain *chain,
1669 const struct nft_rule *rule)
1671 struct nlmsghdr *nlh;
1672 struct nfgenmsg *nfmsg;
1673 const struct nft_expr *expr, *next;
1674 struct nlattr *list;
1675 const struct nft_rule *prule;
1676 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1678 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1681 goto nla_put_failure;
1683 nfmsg = nlmsg_data(nlh);
1684 nfmsg->nfgen_family = family;
1685 nfmsg->version = NFNETLINK_V0;
1686 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1688 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1689 goto nla_put_failure;
1690 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1691 goto nla_put_failure;
1692 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1693 goto nla_put_failure;
1695 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1696 prule = list_entry(rule->list.prev, struct nft_rule, list);
1697 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1698 cpu_to_be64(prule->handle)))
1699 goto nla_put_failure;
1702 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1704 goto nla_put_failure;
1705 nft_rule_for_each_expr(expr, next, rule) {
1706 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1708 goto nla_put_failure;
1709 if (nf_tables_fill_expr_info(skb, expr) < 0)
1710 goto nla_put_failure;
1711 nla_nest_end(skb, elem);
1713 nla_nest_end(skb, list);
1716 struct nft_userdata *udata = nft_userdata(rule);
1717 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1719 goto nla_put_failure;
1722 nlmsg_end(skb, nlh);
1726 nlmsg_trim(skb, nlh);
1730 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1731 const struct nft_rule *rule,
1734 struct sk_buff *skb;
1738 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1742 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1746 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1747 event, 0, ctx->afi->family, ctx->table,
1754 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1755 ctx->report, GFP_KERNEL);
1758 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1764 static int nf_tables_dump_rules(struct sk_buff *skb,
1765 struct netlink_callback *cb)
1767 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1768 const struct nft_af_info *afi;
1769 const struct nft_table *table;
1770 const struct nft_chain *chain;
1771 const struct nft_rule *rule;
1772 unsigned int idx = 0, s_idx = cb->args[0];
1773 struct net *net = sock_net(skb->sk);
1774 int family = nfmsg->nfgen_family;
1777 cb->seq = net->nft.base_seq;
1779 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1780 if (family != NFPROTO_UNSPEC && family != afi->family)
1783 list_for_each_entry_rcu(table, &afi->tables, list) {
1784 list_for_each_entry_rcu(chain, &table->chains, list) {
1785 list_for_each_entry_rcu(rule, &chain->rules, list) {
1786 if (!nft_rule_is_active(net, rule))
1791 memset(&cb->args[1], 0,
1792 sizeof(cb->args) - sizeof(cb->args[0]));
1793 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1796 NLM_F_MULTI | NLM_F_APPEND,
1797 afi->family, table, chain, rule) < 0)
1800 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1814 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1815 const struct nlmsghdr *nlh,
1816 const struct nlattr * const nla[])
1818 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1819 const struct nft_af_info *afi;
1820 const struct nft_table *table;
1821 const struct nft_chain *chain;
1822 const struct nft_rule *rule;
1823 struct sk_buff *skb2;
1824 struct net *net = sock_net(skb->sk);
1825 int family = nfmsg->nfgen_family;
1828 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1829 struct netlink_dump_control c = {
1830 .dump = nf_tables_dump_rules,
1832 return netlink_dump_start(nlsk, skb, nlh, &c);
1835 afi = nf_tables_afinfo_lookup(net, family, false);
1837 return PTR_ERR(afi);
1839 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1841 return PTR_ERR(table);
1842 if (table->flags & NFT_TABLE_INACTIVE)
1845 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1847 return PTR_ERR(chain);
1848 if (chain->flags & NFT_CHAIN_INACTIVE)
1851 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1853 return PTR_ERR(rule);
1855 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1859 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1860 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1861 family, table, chain, rule);
1865 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1872 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1873 struct nft_rule *rule)
1875 struct nft_expr *expr;
1878 * Careful: some expressions might not be initialized in case this
1879 * is called on error from nf_tables_newrule().
1881 expr = nft_expr_first(rule);
1882 while (expr->ops && expr != nft_expr_last(rule)) {
1883 nf_tables_expr_destroy(ctx, expr);
1884 expr = nft_expr_next(expr);
1889 #define NFT_RULE_MAXEXPRS 128
1891 static struct nft_expr_info *info;
1893 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1894 const struct nlmsghdr *nlh,
1895 const struct nlattr * const nla[])
1897 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1898 struct nft_af_info *afi;
1899 struct net *net = sock_net(skb->sk);
1900 struct nft_table *table;
1901 struct nft_chain *chain;
1902 struct nft_rule *rule, *old_rule = NULL;
1903 struct nft_userdata *udata;
1904 struct nft_trans *trans = NULL;
1905 struct nft_expr *expr;
1908 unsigned int size, i, n, ulen = 0, usize = 0;
1911 u64 handle, pos_handle;
1913 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1915 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1917 return PTR_ERR(afi);
1919 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1921 return PTR_ERR(table);
1923 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1925 return PTR_ERR(chain);
1927 if (nla[NFTA_RULE_HANDLE]) {
1928 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1929 rule = __nf_tables_rule_lookup(chain, handle);
1931 return PTR_ERR(rule);
1933 if (nlh->nlmsg_flags & NLM_F_EXCL)
1935 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1940 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1942 handle = nf_tables_alloc_handle(table);
1944 if (chain->use == UINT_MAX)
1948 if (nla[NFTA_RULE_POSITION]) {
1949 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1952 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1953 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1954 if (IS_ERR(old_rule))
1955 return PTR_ERR(old_rule);
1958 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1962 if (nla[NFTA_RULE_EXPRESSIONS]) {
1963 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1965 if (nla_type(tmp) != NFTA_LIST_ELEM)
1967 if (n == NFT_RULE_MAXEXPRS)
1969 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1972 size += info[n].ops->size;
1976 /* Check for overflow of dlen field */
1978 if (size >= 1 << 12)
1981 if (nla[NFTA_RULE_USERDATA]) {
1982 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
1984 usize = sizeof(struct nft_userdata) + ulen;
1988 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
1992 nft_rule_activate_next(net, rule);
1994 rule->handle = handle;
1996 rule->udata = ulen ? 1 : 0;
1999 udata = nft_userdata(rule);
2000 udata->len = ulen - 1;
2001 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2004 expr = nft_expr_first(rule);
2005 for (i = 0; i < n; i++) {
2006 err = nf_tables_newexpr(&ctx, &info[i], expr);
2010 expr = nft_expr_next(expr);
2013 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2014 if (nft_rule_is_active_next(net, old_rule)) {
2015 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2017 if (trans == NULL) {
2021 nft_rule_deactivate_next(net, old_rule);
2023 list_add_tail_rcu(&rule->list, &old_rule->list);
2028 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2030 list_add_rcu(&rule->list, &old_rule->list);
2032 list_add_tail_rcu(&rule->list, &chain->rules);
2035 list_add_tail_rcu(&rule->list, &old_rule->list);
2037 list_add_rcu(&rule->list, &chain->rules);
2040 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2048 list_del_rcu(&rule->list);
2050 nf_tables_rule_destroy(&ctx, rule);
2052 for (i = 0; i < n; i++) {
2053 if (info[i].ops != NULL)
2054 module_put(info[i].ops->type->owner);
2059 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
2060 const struct nlmsghdr *nlh,
2061 const struct nlattr * const nla[])
2063 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2064 struct nft_af_info *afi;
2065 struct net *net = sock_net(skb->sk);
2066 struct nft_table *table;
2067 struct nft_chain *chain = NULL;
2068 struct nft_rule *rule;
2069 int family = nfmsg->nfgen_family, err = 0;
2072 afi = nf_tables_afinfo_lookup(net, family, false);
2074 return PTR_ERR(afi);
2076 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2078 return PTR_ERR(table);
2079 if (table->flags & NFT_TABLE_INACTIVE)
2082 if (nla[NFTA_RULE_CHAIN]) {
2083 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2085 return PTR_ERR(chain);
2088 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
2091 if (nla[NFTA_RULE_HANDLE]) {
2092 rule = nf_tables_rule_lookup(chain,
2093 nla[NFTA_RULE_HANDLE]);
2095 return PTR_ERR(rule);
2097 err = nft_delrule(&ctx, rule);
2099 err = nft_delrule_by_chain(&ctx);
2102 list_for_each_entry(chain, &table->chains, list) {
2104 err = nft_delrule_by_chain(&ctx);
2117 static LIST_HEAD(nf_tables_set_ops);
2119 int nft_register_set(struct nft_set_ops *ops)
2121 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2122 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2123 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2126 EXPORT_SYMBOL_GPL(nft_register_set);
2128 void nft_unregister_set(struct nft_set_ops *ops)
2130 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2131 list_del_rcu(&ops->list);
2132 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2134 EXPORT_SYMBOL_GPL(nft_unregister_set);
2137 * Select a set implementation based on the data characteristics and the
2138 * given policy. The total memory use might not be known if no size is
2139 * given, in that case the amount of memory per element is used.
2141 static const struct nft_set_ops *
2142 nft_select_set_ops(const struct nlattr * const nla[],
2143 const struct nft_set_desc *desc,
2144 enum nft_set_policies policy)
2146 const struct nft_set_ops *ops, *bops;
2147 struct nft_set_estimate est, best;
2150 #ifdef CONFIG_MODULES
2151 if (list_empty(&nf_tables_set_ops)) {
2152 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2153 request_module("nft-set");
2154 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2155 if (!list_empty(&nf_tables_set_ops))
2156 return ERR_PTR(-EAGAIN);
2160 if (nla[NFTA_SET_FLAGS] != NULL) {
2161 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2162 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
2169 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2170 if ((ops->features & features) != features)
2172 if (!ops->estimate(desc, features, &est))
2176 case NFT_SET_POL_PERFORMANCE:
2177 if (est.class < best.class)
2179 if (est.class == best.class && est.size < best.size)
2182 case NFT_SET_POL_MEMORY:
2183 if (est.size < best.size)
2185 if (est.size == best.size && est.class < best.class)
2192 if (!try_module_get(ops->owner))
2195 module_put(bops->owner);
2204 return ERR_PTR(-EOPNOTSUPP);
2207 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2208 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2209 [NFTA_SET_NAME] = { .type = NLA_STRING,
2210 .len = IFNAMSIZ - 1 },
2211 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2212 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2213 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2214 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2215 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2216 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2217 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2218 [NFTA_SET_ID] = { .type = NLA_U32 },
2219 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2220 [NFTA_SET_GC_INTERVAL] = { .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;
2372 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout)))
2373 goto nla_put_failure;
2375 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2376 goto nla_put_failure;
2378 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2379 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2380 goto nla_put_failure;
2383 desc = nla_nest_start(skb, NFTA_SET_DESC);
2385 goto nla_put_failure;
2387 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2388 goto nla_put_failure;
2389 nla_nest_end(skb, desc);
2391 nlmsg_end(skb, nlh);
2395 nlmsg_trim(skb, nlh);
2399 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2400 const struct nft_set *set,
2401 int event, gfp_t gfp_flags)
2403 struct sk_buff *skb;
2404 u32 portid = ctx->portid;
2408 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2412 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2416 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2422 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2423 ctx->report, gfp_flags);
2426 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2430 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2432 const struct nft_set *set;
2433 unsigned int idx, s_idx = cb->args[0];
2434 struct nft_af_info *afi;
2435 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2436 struct net *net = sock_net(skb->sk);
2437 int cur_family = cb->args[3];
2438 struct nft_ctx *ctx = cb->data, ctx_set;
2444 cb->seq = net->nft.base_seq;
2446 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2447 if (ctx->afi && ctx->afi != afi)
2451 if (afi->family != cur_family)
2456 list_for_each_entry_rcu(table, &afi->tables, list) {
2457 if (ctx->table && ctx->table != table)
2461 if (cur_table != table)
2467 list_for_each_entry_rcu(set, &table->sets, list) {
2472 ctx_set.table = table;
2474 if (nf_tables_fill_set(skb, &ctx_set, set,
2478 cb->args[2] = (unsigned long) table;
2479 cb->args[3] = afi->family;
2482 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2496 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2502 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2503 const struct nlmsghdr *nlh,
2504 const struct nlattr * const nla[])
2506 const struct nft_set *set;
2508 struct sk_buff *skb2;
2509 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2512 /* Verify existence before starting dump */
2513 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2517 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2518 struct netlink_dump_control c = {
2519 .dump = nf_tables_dump_sets,
2520 .done = nf_tables_dump_sets_done,
2522 struct nft_ctx *ctx_dump;
2524 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2525 if (ctx_dump == NULL)
2531 return netlink_dump_start(nlsk, skb, nlh, &c);
2534 /* Only accept unspec with dump */
2535 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2536 return -EAFNOSUPPORT;
2538 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2540 return PTR_ERR(set);
2541 if (set->flags & NFT_SET_INACTIVE)
2544 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2548 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2552 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2559 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2560 struct nft_set_desc *desc,
2561 const struct nlattr *nla)
2563 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2566 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2570 if (da[NFTA_SET_DESC_SIZE] != NULL)
2571 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2576 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2577 const struct nlmsghdr *nlh,
2578 const struct nlattr * const nla[])
2580 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2581 const struct nft_set_ops *ops;
2582 struct nft_af_info *afi;
2583 struct net *net = sock_net(skb->sk);
2584 struct nft_table *table;
2585 struct nft_set *set;
2587 char name[IFNAMSIZ];
2591 u32 ktype, dtype, flags, policy, gc_int;
2592 struct nft_set_desc desc;
2595 if (nla[NFTA_SET_TABLE] == NULL ||
2596 nla[NFTA_SET_NAME] == NULL ||
2597 nla[NFTA_SET_KEY_LEN] == NULL ||
2598 nla[NFTA_SET_ID] == NULL)
2601 memset(&desc, 0, sizeof(desc));
2603 ktype = NFT_DATA_VALUE;
2604 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2605 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2606 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2610 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2611 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2615 if (nla[NFTA_SET_FLAGS] != NULL) {
2616 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2617 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2618 NFT_SET_INTERVAL | NFT_SET_MAP |
2624 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2625 if (!(flags & NFT_SET_MAP))
2628 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2629 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2630 dtype != NFT_DATA_VERDICT)
2633 if (dtype != NFT_DATA_VERDICT) {
2634 if (nla[NFTA_SET_DATA_LEN] == NULL)
2636 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2637 if (desc.dlen == 0 ||
2638 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2641 desc.dlen = sizeof(struct nft_data);
2642 } else if (flags & NFT_SET_MAP)
2646 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2647 if (!(flags & NFT_SET_TIMEOUT))
2649 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2652 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2653 if (!(flags & NFT_SET_TIMEOUT))
2655 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2658 policy = NFT_SET_POL_PERFORMANCE;
2659 if (nla[NFTA_SET_POLICY] != NULL)
2660 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2662 if (nla[NFTA_SET_DESC] != NULL) {
2663 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2668 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2670 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2672 return PTR_ERR(afi);
2674 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2676 return PTR_ERR(table);
2678 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2680 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2682 if (PTR_ERR(set) != -ENOENT)
2683 return PTR_ERR(set);
2688 if (nlh->nlmsg_flags & NLM_F_EXCL)
2690 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2695 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2698 ops = nft_select_set_ops(nla, &desc, policy);
2700 return PTR_ERR(ops);
2703 if (ops->privsize != NULL)
2704 size = ops->privsize(nla);
2707 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2711 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2712 err = nf_tables_set_alloc_name(&ctx, set, name);
2716 INIT_LIST_HEAD(&set->bindings);
2717 write_pnet(&set->pnet, net);
2720 set->klen = desc.klen;
2722 set->dlen = desc.dlen;
2724 set->size = desc.size;
2725 set->policy = policy;
2726 set->timeout = timeout;
2727 set->gc_int = gc_int;
2729 err = ops->init(set, &desc, nla);
2733 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2737 list_add_tail_rcu(&set->list, &table->sets);
2744 module_put(ops->owner);
2748 static void nft_set_destroy(struct nft_set *set)
2750 set->ops->destroy(set);
2751 module_put(set->ops->owner);
2755 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2757 list_del_rcu(&set->list);
2758 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2759 nft_set_destroy(set);
2762 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2763 const struct nlmsghdr *nlh,
2764 const struct nlattr * const nla[])
2766 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2767 struct nft_set *set;
2771 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2772 return -EAFNOSUPPORT;
2773 if (nla[NFTA_SET_TABLE] == NULL)
2776 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2780 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2782 return PTR_ERR(set);
2783 if (set->flags & NFT_SET_INACTIVE)
2785 if (!list_empty(&set->bindings))
2788 return nft_delset(&ctx, set);
2791 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2792 const struct nft_set *set,
2793 const struct nft_set_iter *iter,
2794 const struct nft_set_elem *elem)
2796 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
2797 enum nft_registers dreg;
2799 dreg = nft_type_to_reg(set->dtype);
2800 return nft_validate_data_load(ctx, dreg, nft_set_ext_data(ext),
2801 set->dtype == NFT_DATA_VERDICT ?
2802 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2805 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2806 struct nft_set_binding *binding)
2808 struct nft_set_binding *i;
2809 struct nft_set_iter iter;
2811 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2814 if (set->flags & NFT_SET_MAP) {
2815 /* If the set is already bound to the same chain all
2816 * jumps are already validated for that chain.
2818 list_for_each_entry(i, &set->bindings, list) {
2819 if (i->chain == binding->chain)
2826 iter.fn = nf_tables_bind_check_setelem;
2828 set->ops->walk(ctx, set, &iter);
2830 /* Destroy anonymous sets if binding fails */
2831 if (set->flags & NFT_SET_ANONYMOUS)
2832 nf_tables_set_destroy(ctx, set);
2838 binding->chain = ctx->chain;
2839 list_add_tail_rcu(&binding->list, &set->bindings);
2843 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2844 struct nft_set_binding *binding)
2846 list_del_rcu(&binding->list);
2848 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2849 !(set->flags & NFT_SET_INACTIVE))
2850 nf_tables_set_destroy(ctx, set);
2853 const struct nft_set_ext_type nft_set_ext_types[] = {
2854 [NFT_SET_EXT_KEY] = {
2855 .len = sizeof(struct nft_data),
2856 .align = __alignof__(struct nft_data),
2858 [NFT_SET_EXT_DATA] = {
2859 .len = sizeof(struct nft_data),
2860 .align = __alignof__(struct nft_data),
2862 [NFT_SET_EXT_FLAGS] = {
2864 .align = __alignof__(u8),
2866 [NFT_SET_EXT_TIMEOUT] = {
2868 .align = __alignof__(u64),
2870 [NFT_SET_EXT_EXPIRATION] = {
2871 .len = sizeof(unsigned long),
2872 .align = __alignof__(unsigned long),
2875 EXPORT_SYMBOL_GPL(nft_set_ext_types);
2881 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2882 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2883 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2884 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2885 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
2888 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2889 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2890 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2891 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2892 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2895 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2896 const struct sk_buff *skb,
2897 const struct nlmsghdr *nlh,
2898 const struct nlattr * const nla[],
2901 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2902 struct nft_af_info *afi;
2903 struct nft_table *table;
2904 struct net *net = sock_net(skb->sk);
2906 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2908 return PTR_ERR(afi);
2910 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2912 return PTR_ERR(table);
2913 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2916 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2920 static int nf_tables_fill_setelem(struct sk_buff *skb,
2921 const struct nft_set *set,
2922 const struct nft_set_elem *elem)
2924 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
2925 unsigned char *b = skb_tail_pointer(skb);
2926 struct nlattr *nest;
2928 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2930 goto nla_put_failure;
2932 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
2933 NFT_DATA_VALUE, set->klen) < 0)
2934 goto nla_put_failure;
2936 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
2937 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
2938 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2940 goto nla_put_failure;
2942 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
2943 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
2944 htonl(*nft_set_ext_flags(ext))))
2945 goto nla_put_failure;
2947 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
2948 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
2949 cpu_to_be64(*nft_set_ext_timeout(ext))))
2950 goto nla_put_failure;
2952 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
2953 unsigned long expires, now = jiffies;
2955 expires = *nft_set_ext_expiration(ext);
2956 if (time_before(now, expires))
2961 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
2962 cpu_to_be64(jiffies_to_msecs(expires))))
2963 goto nla_put_failure;
2966 nla_nest_end(skb, nest);
2974 struct nft_set_dump_args {
2975 const struct netlink_callback *cb;
2976 struct nft_set_iter iter;
2977 struct sk_buff *skb;
2980 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2981 const struct nft_set *set,
2982 const struct nft_set_iter *iter,
2983 const struct nft_set_elem *elem)
2985 struct nft_set_dump_args *args;
2987 args = container_of(iter, struct nft_set_dump_args, iter);
2988 return nf_tables_fill_setelem(args->skb, set, elem);
2991 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2993 const struct nft_set *set;
2994 struct nft_set_dump_args args;
2996 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2997 struct nfgenmsg *nfmsg;
2998 struct nlmsghdr *nlh;
2999 struct nlattr *nest;
3003 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3004 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3008 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
3013 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3015 return PTR_ERR(set);
3016 if (set->flags & NFT_SET_INACTIVE)
3019 event = NFT_MSG_NEWSETELEM;
3020 event |= NFNL_SUBSYS_NFTABLES << 8;
3021 portid = NETLINK_CB(cb->skb).portid;
3022 seq = cb->nlh->nlmsg_seq;
3024 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3027 goto nla_put_failure;
3029 nfmsg = nlmsg_data(nlh);
3030 nfmsg->nfgen_family = ctx.afi->family;
3031 nfmsg->version = NFNETLINK_V0;
3032 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3034 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3035 goto nla_put_failure;
3036 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3037 goto nla_put_failure;
3039 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3041 goto nla_put_failure;
3045 args.iter.skip = cb->args[0];
3046 args.iter.count = 0;
3048 args.iter.fn = nf_tables_dump_setelem;
3049 set->ops->walk(&ctx, set, &args.iter);
3051 nla_nest_end(skb, nest);
3052 nlmsg_end(skb, nlh);
3054 if (args.iter.err && args.iter.err != -EMSGSIZE)
3055 return args.iter.err;
3056 if (args.iter.count == cb->args[0])
3059 cb->args[0] = args.iter.count;
3066 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
3067 const struct nlmsghdr *nlh,
3068 const struct nlattr * const nla[])
3070 const struct nft_set *set;
3074 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3078 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3080 return PTR_ERR(set);
3081 if (set->flags & NFT_SET_INACTIVE)
3084 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3085 struct netlink_dump_control c = {
3086 .dump = nf_tables_dump_set,
3088 return netlink_dump_start(nlsk, skb, nlh, &c);
3093 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3094 const struct nft_ctx *ctx, u32 seq,
3095 u32 portid, int event, u16 flags,
3096 const struct nft_set *set,
3097 const struct nft_set_elem *elem)
3099 struct nfgenmsg *nfmsg;
3100 struct nlmsghdr *nlh;
3101 struct nlattr *nest;
3104 event |= NFNL_SUBSYS_NFTABLES << 8;
3105 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3108 goto nla_put_failure;
3110 nfmsg = nlmsg_data(nlh);
3111 nfmsg->nfgen_family = ctx->afi->family;
3112 nfmsg->version = NFNETLINK_V0;
3113 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3115 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3116 goto nla_put_failure;
3117 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3118 goto nla_put_failure;
3120 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3122 goto nla_put_failure;
3124 err = nf_tables_fill_setelem(skb, set, elem);
3126 goto nla_put_failure;
3128 nla_nest_end(skb, nest);
3130 nlmsg_end(skb, nlh);
3134 nlmsg_trim(skb, nlh);
3138 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3139 const struct nft_set *set,
3140 const struct nft_set_elem *elem,
3141 int event, u16 flags)
3143 struct net *net = ctx->net;
3144 u32 portid = ctx->portid;
3145 struct sk_buff *skb;
3148 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3152 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3156 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3163 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3167 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3171 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3173 struct nft_set *set)
3175 struct nft_trans *trans;
3177 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3181 nft_trans_elem_set(trans) = set;
3185 static void *nft_set_elem_init(const struct nft_set *set,
3186 const struct nft_set_ext_tmpl *tmpl,
3187 const struct nft_data *key,
3188 const struct nft_data *data,
3189 u64 timeout, gfp_t gfp)
3191 struct nft_set_ext *ext;
3194 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3198 ext = nft_set_elem_ext(set, elem);
3199 nft_set_ext_init(ext, tmpl);
3201 memcpy(nft_set_ext_key(ext), key, set->klen);
3202 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3203 memcpy(nft_set_ext_data(ext), data, set->dlen);
3204 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3205 *nft_set_ext_expiration(ext) =
3206 jiffies + msecs_to_jiffies(timeout);
3207 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3208 *nft_set_ext_timeout(ext) = timeout;
3213 void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3215 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3217 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3218 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3219 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3223 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3225 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3226 const struct nlattr *attr)
3228 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3229 struct nft_data_desc d1, d2;
3230 struct nft_set_ext_tmpl tmpl;
3231 struct nft_set_ext *ext;
3232 struct nft_set_elem elem;
3233 struct nft_set_binding *binding;
3234 struct nft_data data;
3235 enum nft_registers dreg;
3236 struct nft_trans *trans;
3241 if (set->size && set->nelems == set->size)
3244 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3245 nft_set_elem_policy);
3249 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3252 nft_set_ext_prepare(&tmpl);
3255 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3256 flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3257 if (flags & ~NFT_SET_ELEM_INTERVAL_END)
3259 if (!(set->flags & NFT_SET_INTERVAL) &&
3260 flags & NFT_SET_ELEM_INTERVAL_END)
3263 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3266 if (set->flags & NFT_SET_MAP) {
3267 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3268 !(flags & NFT_SET_ELEM_INTERVAL_END))
3270 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3271 flags & NFT_SET_ELEM_INTERVAL_END)
3274 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3279 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3280 if (!(set->flags & NFT_SET_TIMEOUT))
3282 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3283 } else if (set->flags & NFT_SET_TIMEOUT) {
3284 timeout = set->timeout;
3287 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3291 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3294 nft_set_ext_add(&tmpl, NFT_SET_EXT_KEY);
3296 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3297 if (timeout != set->timeout)
3298 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3301 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3302 err = nft_data_init(ctx, &data, &d2, nla[NFTA_SET_ELEM_DATA]);
3307 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3310 dreg = nft_type_to_reg(set->dtype);
3311 list_for_each_entry(binding, &set->bindings, list) {
3312 struct nft_ctx bind_ctx = {
3314 .table = ctx->table,
3315 .chain = (struct nft_chain *)binding->chain,
3318 err = nft_validate_data_load(&bind_ctx, dreg,
3324 nft_set_ext_add(&tmpl, NFT_SET_EXT_DATA);
3328 elem.priv = nft_set_elem_init(set, &tmpl, &elem.key, &data,
3329 timeout, GFP_KERNEL);
3330 if (elem.priv == NULL)
3333 ext = nft_set_elem_ext(set, elem.priv);
3335 *nft_set_ext_flags(ext) = flags;
3337 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3341 ext->genmask = nft_genmask_cur(ctx->net);
3342 err = set->ops->insert(set, &elem);
3346 nft_trans_elem(trans) = elem;
3347 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3355 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3356 nft_data_uninit(&data, d2.type);
3358 nft_data_uninit(&elem.key, d1.type);
3363 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3364 const struct nlmsghdr *nlh,
3365 const struct nlattr * const nla[])
3367 struct net *net = sock_net(skb->sk);
3368 const struct nlattr *attr;
3369 struct nft_set *set;
3373 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3376 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3380 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3382 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3383 set = nf_tables_set_lookup_byid(net,
3384 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3387 return PTR_ERR(set);
3390 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3393 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3394 err = nft_add_set_elem(&ctx, set, attr);
3403 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3404 const struct nlattr *attr)
3406 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3407 struct nft_data_desc desc;
3408 struct nft_set_elem elem;
3409 struct nft_trans *trans;
3412 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3413 nft_set_elem_policy);
3418 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3421 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3426 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3429 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3430 if (trans == NULL) {
3435 elem.priv = set->ops->deactivate(set, &elem);
3436 if (elem.priv == NULL) {
3441 nft_trans_elem(trans) = elem;
3442 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3448 nft_data_uninit(&elem.key, desc.type);
3453 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3454 const struct nlmsghdr *nlh,
3455 const struct nlattr * const nla[])
3457 const struct nlattr *attr;
3458 struct nft_set *set;
3462 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3465 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3469 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3471 return PTR_ERR(set);
3472 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3475 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3476 err = nft_del_setelem(&ctx, set, attr);
3485 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3486 u32 portid, u32 seq)
3488 struct nlmsghdr *nlh;
3489 struct nfgenmsg *nfmsg;
3490 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3492 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3494 goto nla_put_failure;
3496 nfmsg = nlmsg_data(nlh);
3497 nfmsg->nfgen_family = AF_UNSPEC;
3498 nfmsg->version = NFNETLINK_V0;
3499 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3501 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3502 goto nla_put_failure;
3504 nlmsg_end(skb, nlh);
3508 nlmsg_trim(skb, nlh);
3512 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3514 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3515 struct sk_buff *skb2;
3518 if (nlmsg_report(nlh) &&
3519 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3523 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3527 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3534 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3535 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3538 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3544 static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb,
3545 const struct nlmsghdr *nlh,
3546 const struct nlattr * const nla[])
3548 struct net *net = sock_net(skb->sk);
3549 struct sk_buff *skb2;
3552 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3556 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3561 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3567 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3568 [NFT_MSG_NEWTABLE] = {
3569 .call_batch = nf_tables_newtable,
3570 .attr_count = NFTA_TABLE_MAX,
3571 .policy = nft_table_policy,
3573 [NFT_MSG_GETTABLE] = {
3574 .call = nf_tables_gettable,
3575 .attr_count = NFTA_TABLE_MAX,
3576 .policy = nft_table_policy,
3578 [NFT_MSG_DELTABLE] = {
3579 .call_batch = nf_tables_deltable,
3580 .attr_count = NFTA_TABLE_MAX,
3581 .policy = nft_table_policy,
3583 [NFT_MSG_NEWCHAIN] = {
3584 .call_batch = nf_tables_newchain,
3585 .attr_count = NFTA_CHAIN_MAX,
3586 .policy = nft_chain_policy,
3588 [NFT_MSG_GETCHAIN] = {
3589 .call = nf_tables_getchain,
3590 .attr_count = NFTA_CHAIN_MAX,
3591 .policy = nft_chain_policy,
3593 [NFT_MSG_DELCHAIN] = {
3594 .call_batch = nf_tables_delchain,
3595 .attr_count = NFTA_CHAIN_MAX,
3596 .policy = nft_chain_policy,
3598 [NFT_MSG_NEWRULE] = {
3599 .call_batch = nf_tables_newrule,
3600 .attr_count = NFTA_RULE_MAX,
3601 .policy = nft_rule_policy,
3603 [NFT_MSG_GETRULE] = {
3604 .call = nf_tables_getrule,
3605 .attr_count = NFTA_RULE_MAX,
3606 .policy = nft_rule_policy,
3608 [NFT_MSG_DELRULE] = {
3609 .call_batch = nf_tables_delrule,
3610 .attr_count = NFTA_RULE_MAX,
3611 .policy = nft_rule_policy,
3613 [NFT_MSG_NEWSET] = {
3614 .call_batch = nf_tables_newset,
3615 .attr_count = NFTA_SET_MAX,
3616 .policy = nft_set_policy,
3618 [NFT_MSG_GETSET] = {
3619 .call = nf_tables_getset,
3620 .attr_count = NFTA_SET_MAX,
3621 .policy = nft_set_policy,
3623 [NFT_MSG_DELSET] = {
3624 .call_batch = nf_tables_delset,
3625 .attr_count = NFTA_SET_MAX,
3626 .policy = nft_set_policy,
3628 [NFT_MSG_NEWSETELEM] = {
3629 .call_batch = nf_tables_newsetelem,
3630 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3631 .policy = nft_set_elem_list_policy,
3633 [NFT_MSG_GETSETELEM] = {
3634 .call = nf_tables_getsetelem,
3635 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3636 .policy = nft_set_elem_list_policy,
3638 [NFT_MSG_DELSETELEM] = {
3639 .call_batch = nf_tables_delsetelem,
3640 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3641 .policy = nft_set_elem_list_policy,
3643 [NFT_MSG_GETGEN] = {
3644 .call = nf_tables_getgen,
3648 static void nft_chain_commit_update(struct nft_trans *trans)
3650 struct nft_base_chain *basechain;
3652 if (nft_trans_chain_name(trans)[0])
3653 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3655 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3658 basechain = nft_base_chain(trans->ctx.chain);
3659 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3661 switch (nft_trans_chain_policy(trans)) {
3664 basechain->policy = nft_trans_chain_policy(trans);
3669 static void nf_tables_commit_release(struct nft_trans *trans)
3671 switch (trans->msg_type) {
3672 case NFT_MSG_DELTABLE:
3673 nf_tables_table_destroy(&trans->ctx);
3675 case NFT_MSG_DELCHAIN:
3676 nf_tables_chain_destroy(trans->ctx.chain);
3678 case NFT_MSG_DELRULE:
3679 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3681 case NFT_MSG_DELSET:
3682 nft_set_destroy(nft_trans_set(trans));
3684 case NFT_MSG_DELSETELEM:
3685 nft_set_elem_destroy(nft_trans_elem_set(trans),
3686 nft_trans_elem(trans).priv);
3692 static int nf_tables_commit(struct sk_buff *skb)
3694 struct net *net = sock_net(skb->sk);
3695 struct nft_trans *trans, *next;
3696 struct nft_trans_elem *te;
3698 /* Bump generation counter, invalidate any dump in progress */
3699 while (++net->nft.base_seq == 0);
3701 /* A new generation has just started */
3702 net->nft.gencursor = nft_gencursor_next(net);
3704 /* Make sure all packets have left the previous generation before
3705 * purging old rules.
3709 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3710 switch (trans->msg_type) {
3711 case NFT_MSG_NEWTABLE:
3712 if (nft_trans_table_update(trans)) {
3713 if (!nft_trans_table_enable(trans)) {
3714 nf_tables_table_disable(trans->ctx.afi,
3716 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3719 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3721 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3722 nft_trans_destroy(trans);
3724 case NFT_MSG_DELTABLE:
3725 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3727 case NFT_MSG_NEWCHAIN:
3728 if (nft_trans_chain_update(trans))
3729 nft_chain_commit_update(trans);
3731 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3733 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3734 nft_trans_destroy(trans);
3736 case NFT_MSG_DELCHAIN:
3737 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3738 nf_tables_unregister_hooks(trans->ctx.table,
3740 trans->ctx.afi->nops);
3742 case NFT_MSG_NEWRULE:
3743 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3744 nf_tables_rule_notify(&trans->ctx,
3745 nft_trans_rule(trans),
3747 nft_trans_destroy(trans);
3749 case NFT_MSG_DELRULE:
3750 list_del_rcu(&nft_trans_rule(trans)->list);
3751 nf_tables_rule_notify(&trans->ctx,
3752 nft_trans_rule(trans),
3755 case NFT_MSG_NEWSET:
3756 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3757 /* This avoids hitting -EBUSY when deleting the table
3758 * from the transaction.
3760 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3761 !list_empty(&nft_trans_set(trans)->bindings))
3762 trans->ctx.table->use--;
3764 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3765 NFT_MSG_NEWSET, GFP_KERNEL);
3766 nft_trans_destroy(trans);
3768 case NFT_MSG_DELSET:
3769 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3770 NFT_MSG_DELSET, GFP_KERNEL);
3772 case NFT_MSG_NEWSETELEM:
3773 te = (struct nft_trans_elem *)trans->data;
3775 te->set->ops->activate(te->set, &te->elem);
3776 nf_tables_setelem_notify(&trans->ctx, te->set,
3778 NFT_MSG_NEWSETELEM, 0);
3779 nft_trans_destroy(trans);
3781 case NFT_MSG_DELSETELEM:
3782 te = (struct nft_trans_elem *)trans->data;
3784 nf_tables_setelem_notify(&trans->ctx, te->set,
3786 NFT_MSG_DELSETELEM, 0);
3787 te->set->ops->remove(te->set, &te->elem);
3794 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3795 list_del(&trans->list);
3796 nf_tables_commit_release(trans);
3799 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
3804 static void nf_tables_abort_release(struct nft_trans *trans)
3806 switch (trans->msg_type) {
3807 case NFT_MSG_NEWTABLE:
3808 nf_tables_table_destroy(&trans->ctx);
3810 case NFT_MSG_NEWCHAIN:
3811 nf_tables_chain_destroy(trans->ctx.chain);
3813 case NFT_MSG_NEWRULE:
3814 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3816 case NFT_MSG_NEWSET:
3817 nft_set_destroy(nft_trans_set(trans));
3819 case NFT_MSG_NEWSETELEM:
3820 nft_set_elem_destroy(nft_trans_elem_set(trans),
3821 nft_trans_elem(trans).priv);
3827 static int nf_tables_abort(struct sk_buff *skb)
3829 struct net *net = sock_net(skb->sk);
3830 struct nft_trans *trans, *next;
3831 struct nft_trans_elem *te;
3833 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3834 switch (trans->msg_type) {
3835 case NFT_MSG_NEWTABLE:
3836 if (nft_trans_table_update(trans)) {
3837 if (nft_trans_table_enable(trans)) {
3838 nf_tables_table_disable(trans->ctx.afi,
3840 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3842 nft_trans_destroy(trans);
3844 list_del_rcu(&trans->ctx.table->list);
3847 case NFT_MSG_DELTABLE:
3848 list_add_tail_rcu(&trans->ctx.table->list,
3849 &trans->ctx.afi->tables);
3850 nft_trans_destroy(trans);
3852 case NFT_MSG_NEWCHAIN:
3853 if (nft_trans_chain_update(trans)) {
3854 free_percpu(nft_trans_chain_stats(trans));
3856 nft_trans_destroy(trans);
3858 trans->ctx.table->use--;
3859 list_del_rcu(&trans->ctx.chain->list);
3860 nf_tables_unregister_hooks(trans->ctx.table,
3862 trans->ctx.afi->nops);
3865 case NFT_MSG_DELCHAIN:
3866 trans->ctx.table->use++;
3867 list_add_tail_rcu(&trans->ctx.chain->list,
3868 &trans->ctx.table->chains);
3869 nft_trans_destroy(trans);
3871 case NFT_MSG_NEWRULE:
3872 trans->ctx.chain->use--;
3873 list_del_rcu(&nft_trans_rule(trans)->list);
3875 case NFT_MSG_DELRULE:
3876 trans->ctx.chain->use++;
3877 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3878 nft_trans_destroy(trans);
3880 case NFT_MSG_NEWSET:
3881 trans->ctx.table->use--;
3882 list_del_rcu(&nft_trans_set(trans)->list);
3884 case NFT_MSG_DELSET:
3885 trans->ctx.table->use++;
3886 list_add_tail_rcu(&nft_trans_set(trans)->list,
3887 &trans->ctx.table->sets);
3888 nft_trans_destroy(trans);
3890 case NFT_MSG_NEWSETELEM:
3891 nft_trans_elem_set(trans)->nelems--;
3892 te = (struct nft_trans_elem *)trans->data;
3894 te->set->ops->remove(te->set, &te->elem);
3896 case NFT_MSG_DELSETELEM:
3897 te = (struct nft_trans_elem *)trans->data;
3899 nft_trans_elem_set(trans)->nelems++;
3900 te->set->ops->activate(te->set, &te->elem);
3902 nft_trans_destroy(trans);
3909 list_for_each_entry_safe_reverse(trans, next,
3910 &net->nft.commit_list, list) {
3911 list_del(&trans->list);
3912 nf_tables_abort_release(trans);
3918 static const struct nfnetlink_subsystem nf_tables_subsys = {
3919 .name = "nf_tables",
3920 .subsys_id = NFNL_SUBSYS_NFTABLES,
3921 .cb_count = NFT_MSG_MAX,
3923 .commit = nf_tables_commit,
3924 .abort = nf_tables_abort,
3927 int nft_chain_validate_dependency(const struct nft_chain *chain,
3928 enum nft_chain_type type)
3930 const struct nft_base_chain *basechain;
3932 if (chain->flags & NFT_BASE_CHAIN) {
3933 basechain = nft_base_chain(chain);
3934 if (basechain->type->type != type)
3939 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
3941 int nft_chain_validate_hooks(const struct nft_chain *chain,
3942 unsigned int hook_flags)
3944 struct nft_base_chain *basechain;
3946 if (chain->flags & NFT_BASE_CHAIN) {
3947 basechain = nft_base_chain(chain);
3949 if ((1 << basechain->ops[0].hooknum) & hook_flags)
3957 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
3960 * Loop detection - walk through the ruleset beginning at the destination chain
3961 * of a new jump until either the source chain is reached (loop) or all
3962 * reachable chains have been traversed.
3964 * The loop check is performed whenever a new jump verdict is added to an
3965 * expression or verdict map or a verdict map is bound to a new chain.
3968 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3969 const struct nft_chain *chain);
3971 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3972 const struct nft_set *set,
3973 const struct nft_set_iter *iter,
3974 const struct nft_set_elem *elem)
3976 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3977 const struct nft_data *data;
3979 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3980 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3983 data = nft_set_ext_data(ext);
3984 switch (data->verdict) {
3987 return nf_tables_check_loops(ctx, data->chain);
3993 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3994 const struct nft_chain *chain)
3996 const struct nft_rule *rule;
3997 const struct nft_expr *expr, *last;
3998 const struct nft_set *set;
3999 struct nft_set_binding *binding;
4000 struct nft_set_iter iter;
4002 if (ctx->chain == chain)
4005 list_for_each_entry(rule, &chain->rules, list) {
4006 nft_rule_for_each_expr(expr, last, rule) {
4007 const struct nft_data *data = NULL;
4010 if (!expr->ops->validate)
4013 err = expr->ops->validate(ctx, expr, &data);
4020 switch (data->verdict) {
4023 err = nf_tables_check_loops(ctx, data->chain);
4032 list_for_each_entry(set, &ctx->table->sets, list) {
4033 if (!(set->flags & NFT_SET_MAP) ||
4034 set->dtype != NFT_DATA_VERDICT)
4037 list_for_each_entry(binding, &set->bindings, list) {
4038 if (binding->chain != chain)
4044 iter.fn = nf_tables_loop_check_setelem;
4046 set->ops->walk(ctx, set, &iter);
4056 * nft_validate_input_register - validate an expressions' input register
4058 * @reg: the register number
4060 * Validate that the input register is one of the general purpose
4063 int nft_validate_input_register(enum nft_registers reg)
4065 if (reg <= NFT_REG_VERDICT)
4067 if (reg > NFT_REG_MAX)
4071 EXPORT_SYMBOL_GPL(nft_validate_input_register);
4074 * nft_validate_output_register - validate an expressions' output register
4076 * @reg: the register number
4078 * Validate that the output register is one of the general purpose
4079 * registers or the verdict register.
4081 int nft_validate_output_register(enum nft_registers reg)
4083 if (reg < NFT_REG_VERDICT)
4085 if (reg > NFT_REG_MAX)
4089 EXPORT_SYMBOL_GPL(nft_validate_output_register);
4092 * nft_validate_data_load - validate an expressions' data load
4094 * @ctx: context of the expression performing the load
4095 * @reg: the destination register number
4096 * @data: the data to load
4097 * @type: the data type
4099 * Validate that a data load uses the appropriate data type for
4100 * the destination register. A value of NULL for the data means
4101 * that its runtime gathered data, which is always of type
4104 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
4105 const struct nft_data *data,
4106 enum nft_data_types type)
4111 case NFT_REG_VERDICT:
4112 if (data == NULL || type != NFT_DATA_VERDICT)
4115 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
4116 err = nf_tables_check_loops(ctx, data->chain);
4120 if (ctx->chain->level + 1 > data->chain->level) {
4121 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4123 data->chain->level = ctx->chain->level + 1;
4129 if (data != NULL && type != NFT_DATA_VALUE)
4134 EXPORT_SYMBOL_GPL(nft_validate_data_load);
4136 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4137 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4138 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4139 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4142 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4143 struct nft_data_desc *desc, const struct nlattr *nla)
4145 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4146 struct nft_chain *chain;
4149 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4153 if (!tb[NFTA_VERDICT_CODE])
4155 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
4157 switch (data->verdict) {
4159 switch (data->verdict & NF_VERDICT_MASK) {
4171 desc->len = sizeof(data->verdict);
4175 if (!tb[NFTA_VERDICT_CHAIN])
4177 chain = nf_tables_chain_lookup(ctx->table,
4178 tb[NFTA_VERDICT_CHAIN]);
4180 return PTR_ERR(chain);
4181 if (chain->flags & NFT_BASE_CHAIN)
4185 data->chain = chain;
4186 desc->len = sizeof(data);
4190 desc->type = NFT_DATA_VERDICT;
4194 static void nft_verdict_uninit(const struct nft_data *data)
4196 switch (data->verdict) {
4204 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
4206 struct nlattr *nest;
4208 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
4210 goto nla_put_failure;
4212 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
4213 goto nla_put_failure;
4215 switch (data->verdict) {
4218 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
4219 goto nla_put_failure;
4221 nla_nest_end(skb, nest);
4228 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
4229 struct nft_data_desc *desc, const struct nlattr *nla)
4236 if (len > sizeof(data->data))
4239 nla_memcpy(data->data, nla, sizeof(data->data));
4240 desc->type = NFT_DATA_VALUE;
4245 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4248 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4251 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4252 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
4253 .len = FIELD_SIZEOF(struct nft_data, data) },
4254 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4258 * nft_data_init - parse nf_tables data netlink attributes
4260 * @ctx: context of the expression using the data
4261 * @data: destination struct nft_data
4262 * @desc: data description
4263 * @nla: netlink attribute containing data
4265 * Parse the netlink data attributes and initialize a struct nft_data.
4266 * The type and length of data are returned in the data description.
4268 * The caller can indicate that it only wants to accept data of type
4269 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4271 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
4272 struct nft_data_desc *desc, const struct nlattr *nla)
4274 struct nlattr *tb[NFTA_DATA_MAX + 1];
4277 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4281 if (tb[NFTA_DATA_VALUE])
4282 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
4283 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4284 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4287 EXPORT_SYMBOL_GPL(nft_data_init);
4290 * nft_data_uninit - release a nft_data item
4292 * @data: struct nft_data to release
4293 * @type: type of data
4295 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4296 * all others need to be released by calling this function.
4298 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4301 case NFT_DATA_VALUE:
4303 case NFT_DATA_VERDICT:
4304 return nft_verdict_uninit(data);
4309 EXPORT_SYMBOL_GPL(nft_data_uninit);
4311 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4312 enum nft_data_types type, unsigned int len)
4314 struct nlattr *nest;
4317 nest = nla_nest_start(skb, attr);
4322 case NFT_DATA_VALUE:
4323 err = nft_value_dump(skb, data, len);
4325 case NFT_DATA_VERDICT:
4326 err = nft_verdict_dump(skb, data);
4333 nla_nest_end(skb, nest);
4336 EXPORT_SYMBOL_GPL(nft_data_dump);
4338 static int nf_tables_init_net(struct net *net)
4340 INIT_LIST_HEAD(&net->nft.af_info);
4341 INIT_LIST_HEAD(&net->nft.commit_list);
4342 net->nft.base_seq = 1;
4346 static struct pernet_operations nf_tables_net_ops = {
4347 .init = nf_tables_init_net,
4350 static int __init nf_tables_module_init(void)
4354 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4361 err = nf_tables_core_module_init();
4365 err = nfnetlink_subsys_register(&nf_tables_subsys);
4369 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4370 return register_pernet_subsys(&nf_tables_net_ops);
4372 nf_tables_core_module_exit();
4379 static void __exit nf_tables_module_exit(void)
4381 unregister_pernet_subsys(&nf_tables_net_ops);
4382 nfnetlink_subsys_unregister(&nf_tables_subsys);
4384 nf_tables_core_module_exit();
4388 module_init(nf_tables_module_init);
4389 module_exit(nf_tables_module_exit);
4391 MODULE_LICENSE("GPL");
4392 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4393 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);