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 },
402 [NFTA_TABLE_DEV] = { .type = NLA_STRING,
403 .len = IFNAMSIZ - 1 },
406 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
407 u32 portid, u32 seq, int event, u32 flags,
408 int family, const struct nft_table *table)
410 struct nlmsghdr *nlh;
411 struct nfgenmsg *nfmsg;
413 event |= NFNL_SUBSYS_NFTABLES << 8;
414 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
416 goto nla_put_failure;
418 nfmsg = nlmsg_data(nlh);
419 nfmsg->nfgen_family = family;
420 nfmsg->version = NFNETLINK_V0;
421 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
423 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
424 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
425 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
426 goto nla_put_failure;
429 nla_put_string(skb, NFTA_TABLE_DEV, table->dev->name))
430 goto nla_put_failure;
436 nlmsg_trim(skb, nlh);
440 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
446 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
450 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
454 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
455 event, 0, ctx->afi->family, ctx->table);
461 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
462 ctx->report, GFP_KERNEL);
465 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
471 static int nf_tables_dump_tables(struct sk_buff *skb,
472 struct netlink_callback *cb)
474 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
475 const struct nft_af_info *afi;
476 const struct nft_table *table;
477 unsigned int idx = 0, s_idx = cb->args[0];
478 struct net *net = sock_net(skb->sk);
479 int family = nfmsg->nfgen_family;
482 cb->seq = net->nft.base_seq;
484 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
485 if (family != NFPROTO_UNSPEC && family != afi->family)
488 list_for_each_entry_rcu(table, &afi->tables, list) {
492 memset(&cb->args[1], 0,
493 sizeof(cb->args) - sizeof(cb->args[0]));
494 if (nf_tables_fill_table_info(skb, net,
495 NETLINK_CB(cb->skb).portid,
499 afi->family, table) < 0)
502 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
513 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
514 const struct nlmsghdr *nlh,
515 const struct nlattr * const nla[])
517 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
518 const struct nft_af_info *afi;
519 const struct nft_table *table;
520 struct sk_buff *skb2;
521 struct net *net = sock_net(skb->sk);
522 int family = nfmsg->nfgen_family;
525 if (nlh->nlmsg_flags & NLM_F_DUMP) {
526 struct netlink_dump_control c = {
527 .dump = nf_tables_dump_tables,
529 return netlink_dump_start(nlsk, skb, nlh, &c);
532 afi = nf_tables_afinfo_lookup(net, family, false);
536 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
538 return PTR_ERR(table);
539 if (table->flags & NFT_TABLE_INACTIVE)
542 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
546 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
547 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
552 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
559 static int nf_tables_table_enable(const struct nft_af_info *afi,
560 struct nft_table *table)
562 struct nft_chain *chain;
565 list_for_each_entry(chain, &table->chains, list) {
566 if (!(chain->flags & NFT_BASE_CHAIN))
569 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
577 list_for_each_entry(chain, &table->chains, list) {
578 if (!(chain->flags & NFT_BASE_CHAIN))
584 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
589 static void nf_tables_table_disable(const struct nft_af_info *afi,
590 struct nft_table *table)
592 struct nft_chain *chain;
594 list_for_each_entry(chain, &table->chains, list) {
595 if (chain->flags & NFT_BASE_CHAIN)
596 nf_unregister_hooks(nft_base_chain(chain)->ops,
601 static int nf_tables_updtable(struct nft_ctx *ctx)
603 struct nft_trans *trans;
607 if (!ctx->nla[NFTA_TABLE_FLAGS])
610 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
611 if (flags & ~NFT_TABLE_F_DORMANT)
614 if (flags == ctx->table->flags)
617 if ((ctx->afi->flags & NFT_AF_NEEDS_DEV) &&
618 ctx->nla[NFTA_TABLE_DEV] &&
619 nla_strcmp(ctx->nla[NFTA_TABLE_DEV], ctx->table->dev->name))
622 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
623 sizeof(struct nft_trans_table));
627 if ((flags & NFT_TABLE_F_DORMANT) &&
628 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
629 nft_trans_table_enable(trans) = false;
630 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
631 ctx->table->flags & NFT_TABLE_F_DORMANT) {
632 ret = nf_tables_table_enable(ctx->afi, ctx->table);
634 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
635 nft_trans_table_enable(trans) = true;
641 nft_trans_table_update(trans) = true;
642 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
645 nft_trans_destroy(trans);
649 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
650 const struct nlmsghdr *nlh,
651 const struct nlattr * const nla[])
653 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
654 const struct nlattr *name;
655 struct nft_af_info *afi;
656 struct nft_table *table;
657 struct net *net = sock_net(skb->sk);
658 int family = nfmsg->nfgen_family;
659 struct net_device *dev = NULL;
664 afi = nf_tables_afinfo_lookup(net, family, true);
668 name = nla[NFTA_TABLE_NAME];
669 table = nf_tables_table_lookup(afi, name);
671 if (PTR_ERR(table) != -ENOENT)
672 return PTR_ERR(table);
677 if (table->flags & NFT_TABLE_INACTIVE)
679 if (nlh->nlmsg_flags & NLM_F_EXCL)
681 if (nlh->nlmsg_flags & NLM_F_REPLACE)
684 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
685 return nf_tables_updtable(&ctx);
688 if (nla[NFTA_TABLE_FLAGS]) {
689 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
690 if (flags & ~NFT_TABLE_F_DORMANT)
694 if (afi->flags & NFT_AF_NEEDS_DEV) {
695 char ifname[IFNAMSIZ];
697 if (!nla[NFTA_TABLE_DEV])
700 nla_strlcpy(ifname, nla[NFTA_TABLE_DEV], IFNAMSIZ);
701 dev = dev_get_by_name(net, ifname);
704 } else if (nla[NFTA_TABLE_DEV]) {
709 if (!try_module_get(afi->owner))
713 table = kzalloc(sizeof(*table), GFP_KERNEL);
717 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
718 INIT_LIST_HEAD(&table->chains);
719 INIT_LIST_HEAD(&table->sets);
720 table->flags = flags;
723 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
724 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
728 list_add_tail_rcu(&table->list, &afi->tables);
733 module_put(afi->owner);
741 static int nft_flush_table(struct nft_ctx *ctx)
744 struct nft_chain *chain, *nc;
745 struct nft_set *set, *ns;
747 list_for_each_entry(chain, &ctx->table->chains, list) {
750 err = nft_delrule_by_chain(ctx);
755 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
756 if (set->flags & NFT_SET_ANONYMOUS &&
757 !list_empty(&set->bindings))
760 err = nft_delset(ctx, set);
765 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
768 err = nft_delchain(ctx);
773 err = nft_deltable(ctx);
778 static int nft_flush(struct nft_ctx *ctx, int family)
780 struct nft_af_info *afi;
781 struct nft_table *table, *nt;
782 const struct nlattr * const *nla = ctx->nla;
785 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
786 if (family != AF_UNSPEC && afi->family != family)
790 list_for_each_entry_safe(table, nt, &afi->tables, list) {
791 if (nla[NFTA_TABLE_NAME] &&
792 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
797 err = nft_flush_table(ctx);
806 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
807 const struct nlmsghdr *nlh,
808 const struct nlattr * const nla[])
810 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
811 struct nft_af_info *afi;
812 struct nft_table *table;
813 struct net *net = sock_net(skb->sk);
814 int family = nfmsg->nfgen_family;
817 nft_ctx_init(&ctx, skb, nlh, NULL, NULL, NULL, nla);
818 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
819 return nft_flush(&ctx, family);
821 afi = nf_tables_afinfo_lookup(net, family, false);
825 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
827 return PTR_ERR(table);
828 if (table->flags & NFT_TABLE_INACTIVE)
834 return nft_flush_table(&ctx);
837 static void nf_tables_table_destroy(struct nft_ctx *ctx)
839 BUG_ON(ctx->table->use > 0);
842 dev_put(ctx->table->dev);
845 module_put(ctx->afi->owner);
848 int nft_register_chain_type(const struct nf_chain_type *ctype)
852 nfnl_lock(NFNL_SUBSYS_NFTABLES);
853 if (chain_type[ctype->family][ctype->type] != NULL) {
857 chain_type[ctype->family][ctype->type] = ctype;
859 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
862 EXPORT_SYMBOL_GPL(nft_register_chain_type);
864 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
866 nfnl_lock(NFNL_SUBSYS_NFTABLES);
867 chain_type[ctype->family][ctype->type] = NULL;
868 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
870 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
876 static struct nft_chain *
877 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
879 struct nft_chain *chain;
881 list_for_each_entry(chain, &table->chains, list) {
882 if (chain->handle == handle)
886 return ERR_PTR(-ENOENT);
889 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
890 const struct nlattr *nla)
892 struct nft_chain *chain;
895 return ERR_PTR(-EINVAL);
897 list_for_each_entry(chain, &table->chains, list) {
898 if (!nla_strcmp(nla, chain->name))
902 return ERR_PTR(-ENOENT);
905 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
906 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
907 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
908 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
909 .len = NFT_CHAIN_MAXNAMELEN - 1 },
910 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
911 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
912 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
913 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
916 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
917 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
918 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
921 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
923 struct nft_stats *cpu_stats, total;
929 memset(&total, 0, sizeof(total));
930 for_each_possible_cpu(cpu) {
931 cpu_stats = per_cpu_ptr(stats, cpu);
933 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
934 pkts = cpu_stats->pkts;
935 bytes = cpu_stats->bytes;
936 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
938 total.bytes += bytes;
940 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
942 goto nla_put_failure;
944 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
945 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
946 goto nla_put_failure;
948 nla_nest_end(skb, nest);
955 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
956 u32 portid, u32 seq, int event, u32 flags,
957 int family, const struct nft_table *table,
958 const struct nft_chain *chain)
960 struct nlmsghdr *nlh;
961 struct nfgenmsg *nfmsg;
963 event |= NFNL_SUBSYS_NFTABLES << 8;
964 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
966 goto nla_put_failure;
968 nfmsg = nlmsg_data(nlh);
969 nfmsg->nfgen_family = family;
970 nfmsg->version = NFNETLINK_V0;
971 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
973 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
974 goto nla_put_failure;
975 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
976 goto nla_put_failure;
977 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
978 goto nla_put_failure;
980 if (chain->flags & NFT_BASE_CHAIN) {
981 const struct nft_base_chain *basechain = nft_base_chain(chain);
982 const struct nf_hook_ops *ops = &basechain->ops[0];
985 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
987 goto nla_put_failure;
988 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
989 goto nla_put_failure;
990 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
991 goto nla_put_failure;
992 nla_nest_end(skb, nest);
994 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
995 htonl(basechain->policy)))
996 goto nla_put_failure;
998 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
999 goto nla_put_failure;
1001 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1002 goto nla_put_failure;
1005 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1006 goto nla_put_failure;
1008 nlmsg_end(skb, nlh);
1012 nlmsg_trim(skb, nlh);
1016 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1018 struct sk_buff *skb;
1022 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1026 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1030 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1031 event, 0, ctx->afi->family, ctx->table,
1038 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1039 ctx->report, GFP_KERNEL);
1042 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1048 static int nf_tables_dump_chains(struct sk_buff *skb,
1049 struct netlink_callback *cb)
1051 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1052 const struct nft_af_info *afi;
1053 const struct nft_table *table;
1054 const struct nft_chain *chain;
1055 unsigned int idx = 0, s_idx = cb->args[0];
1056 struct net *net = sock_net(skb->sk);
1057 int family = nfmsg->nfgen_family;
1060 cb->seq = net->nft.base_seq;
1062 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1063 if (family != NFPROTO_UNSPEC && family != afi->family)
1066 list_for_each_entry_rcu(table, &afi->tables, list) {
1067 list_for_each_entry_rcu(chain, &table->chains, list) {
1071 memset(&cb->args[1], 0,
1072 sizeof(cb->args) - sizeof(cb->args[0]));
1073 if (nf_tables_fill_chain_info(skb, net,
1074 NETLINK_CB(cb->skb).portid,
1078 afi->family, table, chain) < 0)
1081 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1093 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
1094 const struct nlmsghdr *nlh,
1095 const struct nlattr * const nla[])
1097 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1098 const struct nft_af_info *afi;
1099 const struct nft_table *table;
1100 const struct nft_chain *chain;
1101 struct sk_buff *skb2;
1102 struct net *net = sock_net(skb->sk);
1103 int family = nfmsg->nfgen_family;
1106 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1107 struct netlink_dump_control c = {
1108 .dump = nf_tables_dump_chains,
1110 return netlink_dump_start(nlsk, skb, nlh, &c);
1113 afi = nf_tables_afinfo_lookup(net, family, false);
1115 return PTR_ERR(afi);
1117 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1119 return PTR_ERR(table);
1120 if (table->flags & NFT_TABLE_INACTIVE)
1123 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1125 return PTR_ERR(chain);
1126 if (chain->flags & NFT_CHAIN_INACTIVE)
1129 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1133 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1134 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1135 family, table, chain);
1139 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1146 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1147 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1148 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1151 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1153 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1154 struct nft_stats __percpu *newstats;
1155 struct nft_stats *stats;
1158 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1160 return ERR_PTR(err);
1162 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1163 return ERR_PTR(-EINVAL);
1165 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1166 if (newstats == NULL)
1167 return ERR_PTR(-ENOMEM);
1169 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1170 * are not exposed to userspace.
1173 stats = this_cpu_ptr(newstats);
1174 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1175 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1181 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1182 struct nft_stats __percpu *newstats)
1184 if (newstats == NULL)
1188 struct nft_stats __percpu *oldstats =
1189 nft_dereference(chain->stats);
1191 rcu_assign_pointer(chain->stats, newstats);
1193 free_percpu(oldstats);
1195 rcu_assign_pointer(chain->stats, newstats);
1198 static void nf_tables_chain_destroy(struct nft_chain *chain)
1200 BUG_ON(chain->use > 0);
1202 if (chain->flags & NFT_BASE_CHAIN) {
1203 module_put(nft_base_chain(chain)->type->owner);
1204 free_percpu(nft_base_chain(chain)->stats);
1205 kfree(nft_base_chain(chain));
1211 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
1212 const struct nlmsghdr *nlh,
1213 const struct nlattr * const nla[])
1215 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1216 const struct nlattr * uninitialized_var(name);
1217 struct nft_af_info *afi;
1218 struct nft_table *table;
1219 struct nft_chain *chain;
1220 struct nft_base_chain *basechain = NULL;
1221 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1222 struct net *net = sock_net(skb->sk);
1223 int family = nfmsg->nfgen_family;
1224 u8 policy = NF_ACCEPT;
1227 struct nft_stats __percpu *stats;
1232 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1234 afi = nf_tables_afinfo_lookup(net, family, true);
1236 return PTR_ERR(afi);
1238 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1240 return PTR_ERR(table);
1243 name = nla[NFTA_CHAIN_NAME];
1245 if (nla[NFTA_CHAIN_HANDLE]) {
1246 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1247 chain = nf_tables_chain_lookup_byhandle(table, handle);
1249 return PTR_ERR(chain);
1251 chain = nf_tables_chain_lookup(table, name);
1252 if (IS_ERR(chain)) {
1253 if (PTR_ERR(chain) != -ENOENT)
1254 return PTR_ERR(chain);
1259 if (nla[NFTA_CHAIN_POLICY]) {
1260 if ((chain != NULL &&
1261 !(chain->flags & NFT_BASE_CHAIN)))
1264 if (chain == NULL &&
1265 nla[NFTA_CHAIN_HOOK] == NULL)
1268 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1278 if (chain != NULL) {
1279 struct nft_stats *stats = NULL;
1280 struct nft_trans *trans;
1282 if (chain->flags & NFT_CHAIN_INACTIVE)
1284 if (nlh->nlmsg_flags & NLM_F_EXCL)
1286 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1289 if (nla[NFTA_CHAIN_HANDLE] && name &&
1290 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1293 if (nla[NFTA_CHAIN_COUNTERS]) {
1294 if (!(chain->flags & NFT_BASE_CHAIN))
1297 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1299 return PTR_ERR(stats);
1302 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1303 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1304 sizeof(struct nft_trans_chain));
1305 if (trans == NULL) {
1310 nft_trans_chain_stats(trans) = stats;
1311 nft_trans_chain_update(trans) = true;
1313 if (nla[NFTA_CHAIN_POLICY])
1314 nft_trans_chain_policy(trans) = policy;
1316 nft_trans_chain_policy(trans) = -1;
1318 if (nla[NFTA_CHAIN_HANDLE] && name) {
1319 nla_strlcpy(nft_trans_chain_name(trans), name,
1320 NFT_CHAIN_MAXNAMELEN);
1322 list_add_tail(&trans->list, &net->nft.commit_list);
1326 if (table->use == UINT_MAX)
1329 if (nla[NFTA_CHAIN_HOOK]) {
1330 const struct nf_chain_type *type;
1331 struct nf_hook_ops *ops;
1333 u32 hooknum, priority;
1335 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1336 if (nla[NFTA_CHAIN_TYPE]) {
1337 type = nf_tables_chain_type_lookup(afi,
1338 nla[NFTA_CHAIN_TYPE],
1341 return PTR_ERR(type);
1344 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1348 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1349 ha[NFTA_HOOK_PRIORITY] == NULL)
1352 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1353 if (hooknum >= afi->nhooks)
1355 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1357 if (!(type->hook_mask & (1 << hooknum)))
1359 if (!try_module_get(type->owner))
1361 hookfn = type->hooks[hooknum];
1363 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1364 if (basechain == NULL) {
1365 module_put(type->owner);
1369 if (nla[NFTA_CHAIN_COUNTERS]) {
1370 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1371 if (IS_ERR(stats)) {
1372 module_put(type->owner);
1374 return PTR_ERR(stats);
1376 basechain->stats = stats;
1378 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1379 if (stats == NULL) {
1380 module_put(type->owner);
1384 rcu_assign_pointer(basechain->stats, stats);
1387 write_pnet(&basechain->pnet, net);
1388 basechain->type = type;
1389 chain = &basechain->chain;
1391 for (i = 0; i < afi->nops; i++) {
1392 ops = &basechain->ops[i];
1394 ops->owner = afi->owner;
1395 ops->hooknum = hooknum;
1396 ops->priority = priority;
1398 ops->hook = afi->hooks[ops->hooknum];
1399 ops->dev = table->dev;
1402 if (afi->hook_ops_init)
1403 afi->hook_ops_init(ops, i);
1406 chain->flags |= NFT_BASE_CHAIN;
1407 basechain->policy = policy;
1409 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1414 INIT_LIST_HEAD(&chain->rules);
1415 chain->handle = nf_tables_alloc_handle(table);
1416 chain->table = table;
1417 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1419 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1420 chain->flags & NFT_BASE_CHAIN) {
1421 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1426 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1427 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1432 list_add_tail_rcu(&chain->list, &table->chains);
1435 nf_tables_unregister_hooks(table, chain, afi->nops);
1437 nf_tables_chain_destroy(chain);
1441 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1442 const struct nlmsghdr *nlh,
1443 const struct nlattr * const nla[])
1445 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1446 struct nft_af_info *afi;
1447 struct nft_table *table;
1448 struct nft_chain *chain;
1449 struct net *net = sock_net(skb->sk);
1450 int family = nfmsg->nfgen_family;
1453 afi = nf_tables_afinfo_lookup(net, family, false);
1455 return PTR_ERR(afi);
1457 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1459 return PTR_ERR(table);
1460 if (table->flags & NFT_TABLE_INACTIVE)
1463 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1465 return PTR_ERR(chain);
1466 if (chain->flags & NFT_CHAIN_INACTIVE)
1471 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1473 return nft_delchain(&ctx);
1481 * nft_register_expr - register nf_tables expr type
1484 * Registers the expr type for use with nf_tables. Returns zero on
1485 * success or a negative errno code otherwise.
1487 int nft_register_expr(struct nft_expr_type *type)
1489 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1490 if (type->family == NFPROTO_UNSPEC)
1491 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1493 list_add_rcu(&type->list, &nf_tables_expressions);
1494 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1497 EXPORT_SYMBOL_GPL(nft_register_expr);
1500 * nft_unregister_expr - unregister nf_tables expr type
1503 * Unregisters the expr typefor use with nf_tables.
1505 void nft_unregister_expr(struct nft_expr_type *type)
1507 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1508 list_del_rcu(&type->list);
1509 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1511 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1513 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1516 const struct nft_expr_type *type;
1518 list_for_each_entry(type, &nf_tables_expressions, list) {
1519 if (!nla_strcmp(nla, type->name) &&
1520 (!type->family || type->family == family))
1526 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1529 const struct nft_expr_type *type;
1532 return ERR_PTR(-EINVAL);
1534 type = __nft_expr_type_get(family, nla);
1535 if (type != NULL && try_module_get(type->owner))
1538 #ifdef CONFIG_MODULES
1540 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1541 request_module("nft-expr-%u-%.*s", family,
1542 nla_len(nla), (char *)nla_data(nla));
1543 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1544 if (__nft_expr_type_get(family, nla))
1545 return ERR_PTR(-EAGAIN);
1547 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1548 request_module("nft-expr-%.*s",
1549 nla_len(nla), (char *)nla_data(nla));
1550 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1551 if (__nft_expr_type_get(family, nla))
1552 return ERR_PTR(-EAGAIN);
1555 return ERR_PTR(-ENOENT);
1558 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1559 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1560 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1563 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1564 const struct nft_expr *expr)
1566 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1567 goto nla_put_failure;
1569 if (expr->ops->dump) {
1570 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1572 goto nla_put_failure;
1573 if (expr->ops->dump(skb, expr) < 0)
1574 goto nla_put_failure;
1575 nla_nest_end(skb, data);
1584 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1585 const struct nft_expr *expr)
1587 struct nlattr *nest;
1589 nest = nla_nest_start(skb, attr);
1591 goto nla_put_failure;
1592 if (nf_tables_fill_expr_info(skb, expr) < 0)
1593 goto nla_put_failure;
1594 nla_nest_end(skb, nest);
1601 struct nft_expr_info {
1602 const struct nft_expr_ops *ops;
1603 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1606 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1607 const struct nlattr *nla,
1608 struct nft_expr_info *info)
1610 const struct nft_expr_type *type;
1611 const struct nft_expr_ops *ops;
1612 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1615 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1619 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1621 return PTR_ERR(type);
1623 if (tb[NFTA_EXPR_DATA]) {
1624 err = nla_parse_nested(info->tb, type->maxattr,
1625 tb[NFTA_EXPR_DATA], type->policy);
1629 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1631 if (type->select_ops != NULL) {
1632 ops = type->select_ops(ctx,
1633 (const struct nlattr * const *)info->tb);
1645 module_put(type->owner);
1649 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1650 const struct nft_expr_info *info,
1651 struct nft_expr *expr)
1653 const struct nft_expr_ops *ops = info->ops;
1658 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1670 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1671 struct nft_expr *expr)
1673 if (expr->ops->destroy)
1674 expr->ops->destroy(ctx, expr);
1675 module_put(expr->ops->type->owner);
1678 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1679 const struct nlattr *nla)
1681 struct nft_expr_info info;
1682 struct nft_expr *expr;
1685 err = nf_tables_expr_parse(ctx, nla, &info);
1690 expr = kzalloc(info.ops->size, GFP_KERNEL);
1694 err = nf_tables_newexpr(ctx, &info, expr);
1700 module_put(info.ops->type->owner);
1702 return ERR_PTR(err);
1705 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1707 nf_tables_expr_destroy(ctx, expr);
1715 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1718 struct nft_rule *rule;
1720 // FIXME: this sucks
1721 list_for_each_entry(rule, &chain->rules, list) {
1722 if (handle == rule->handle)
1726 return ERR_PTR(-ENOENT);
1729 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1730 const struct nlattr *nla)
1733 return ERR_PTR(-EINVAL);
1735 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1738 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1739 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1740 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1741 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1742 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1743 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1744 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1745 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1746 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1747 .len = NFT_USERDATA_MAXLEN },
1750 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1751 u32 portid, u32 seq, int event,
1752 u32 flags, int family,
1753 const struct nft_table *table,
1754 const struct nft_chain *chain,
1755 const struct nft_rule *rule)
1757 struct nlmsghdr *nlh;
1758 struct nfgenmsg *nfmsg;
1759 const struct nft_expr *expr, *next;
1760 struct nlattr *list;
1761 const struct nft_rule *prule;
1762 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1764 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1767 goto nla_put_failure;
1769 nfmsg = nlmsg_data(nlh);
1770 nfmsg->nfgen_family = family;
1771 nfmsg->version = NFNETLINK_V0;
1772 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1774 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1775 goto nla_put_failure;
1776 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1777 goto nla_put_failure;
1778 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1779 goto nla_put_failure;
1781 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1782 prule = list_entry(rule->list.prev, struct nft_rule, list);
1783 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1784 cpu_to_be64(prule->handle)))
1785 goto nla_put_failure;
1788 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1790 goto nla_put_failure;
1791 nft_rule_for_each_expr(expr, next, rule) {
1792 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1793 goto nla_put_failure;
1795 nla_nest_end(skb, list);
1798 struct nft_userdata *udata = nft_userdata(rule);
1799 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1801 goto nla_put_failure;
1804 nlmsg_end(skb, nlh);
1808 nlmsg_trim(skb, nlh);
1812 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1813 const struct nft_rule *rule,
1816 struct sk_buff *skb;
1820 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1824 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1828 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1829 event, 0, ctx->afi->family, ctx->table,
1836 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1837 ctx->report, GFP_KERNEL);
1840 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1846 static int nf_tables_dump_rules(struct sk_buff *skb,
1847 struct netlink_callback *cb)
1849 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1850 const struct nft_af_info *afi;
1851 const struct nft_table *table;
1852 const struct nft_chain *chain;
1853 const struct nft_rule *rule;
1854 unsigned int idx = 0, s_idx = cb->args[0];
1855 struct net *net = sock_net(skb->sk);
1856 int family = nfmsg->nfgen_family;
1859 cb->seq = net->nft.base_seq;
1861 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1862 if (family != NFPROTO_UNSPEC && family != afi->family)
1865 list_for_each_entry_rcu(table, &afi->tables, list) {
1866 list_for_each_entry_rcu(chain, &table->chains, list) {
1867 list_for_each_entry_rcu(rule, &chain->rules, list) {
1868 if (!nft_rule_is_active(net, rule))
1873 memset(&cb->args[1], 0,
1874 sizeof(cb->args) - sizeof(cb->args[0]));
1875 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1878 NLM_F_MULTI | NLM_F_APPEND,
1879 afi->family, table, chain, rule) < 0)
1882 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1896 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1897 const struct nlmsghdr *nlh,
1898 const struct nlattr * const nla[])
1900 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1901 const struct nft_af_info *afi;
1902 const struct nft_table *table;
1903 const struct nft_chain *chain;
1904 const struct nft_rule *rule;
1905 struct sk_buff *skb2;
1906 struct net *net = sock_net(skb->sk);
1907 int family = nfmsg->nfgen_family;
1910 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1911 struct netlink_dump_control c = {
1912 .dump = nf_tables_dump_rules,
1914 return netlink_dump_start(nlsk, skb, nlh, &c);
1917 afi = nf_tables_afinfo_lookup(net, family, false);
1919 return PTR_ERR(afi);
1921 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1923 return PTR_ERR(table);
1924 if (table->flags & NFT_TABLE_INACTIVE)
1927 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1929 return PTR_ERR(chain);
1930 if (chain->flags & NFT_CHAIN_INACTIVE)
1933 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1935 return PTR_ERR(rule);
1937 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1941 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1942 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1943 family, table, chain, rule);
1947 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1954 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1955 struct nft_rule *rule)
1957 struct nft_expr *expr;
1960 * Careful: some expressions might not be initialized in case this
1961 * is called on error from nf_tables_newrule().
1963 expr = nft_expr_first(rule);
1964 while (expr->ops && expr != nft_expr_last(rule)) {
1965 nf_tables_expr_destroy(ctx, expr);
1966 expr = nft_expr_next(expr);
1971 #define NFT_RULE_MAXEXPRS 128
1973 static struct nft_expr_info *info;
1975 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1976 const struct nlmsghdr *nlh,
1977 const struct nlattr * const nla[])
1979 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1980 struct nft_af_info *afi;
1981 struct net *net = sock_net(skb->sk);
1982 struct nft_table *table;
1983 struct nft_chain *chain;
1984 struct nft_rule *rule, *old_rule = NULL;
1985 struct nft_userdata *udata;
1986 struct nft_trans *trans = NULL;
1987 struct nft_expr *expr;
1990 unsigned int size, i, n, ulen = 0, usize = 0;
1993 u64 handle, pos_handle;
1995 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1997 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1999 return PTR_ERR(afi);
2001 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2003 return PTR_ERR(table);
2005 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2007 return PTR_ERR(chain);
2009 if (nla[NFTA_RULE_HANDLE]) {
2010 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2011 rule = __nf_tables_rule_lookup(chain, handle);
2013 return PTR_ERR(rule);
2015 if (nlh->nlmsg_flags & NLM_F_EXCL)
2017 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2022 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2024 handle = nf_tables_alloc_handle(table);
2026 if (chain->use == UINT_MAX)
2030 if (nla[NFTA_RULE_POSITION]) {
2031 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2034 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2035 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2036 if (IS_ERR(old_rule))
2037 return PTR_ERR(old_rule);
2040 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
2044 if (nla[NFTA_RULE_EXPRESSIONS]) {
2045 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2047 if (nla_type(tmp) != NFTA_LIST_ELEM)
2049 if (n == NFT_RULE_MAXEXPRS)
2051 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2054 size += info[n].ops->size;
2058 /* Check for overflow of dlen field */
2060 if (size >= 1 << 12)
2063 if (nla[NFTA_RULE_USERDATA]) {
2064 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2066 usize = sizeof(struct nft_userdata) + ulen;
2070 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2074 nft_rule_activate_next(net, rule);
2076 rule->handle = handle;
2078 rule->udata = ulen ? 1 : 0;
2081 udata = nft_userdata(rule);
2082 udata->len = ulen - 1;
2083 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2086 expr = nft_expr_first(rule);
2087 for (i = 0; i < n; i++) {
2088 err = nf_tables_newexpr(&ctx, &info[i], expr);
2092 expr = nft_expr_next(expr);
2095 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2096 if (nft_rule_is_active_next(net, old_rule)) {
2097 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2099 if (trans == NULL) {
2103 nft_rule_deactivate_next(net, old_rule);
2105 list_add_tail_rcu(&rule->list, &old_rule->list);
2110 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2112 list_add_rcu(&rule->list, &old_rule->list);
2114 list_add_tail_rcu(&rule->list, &chain->rules);
2117 list_add_tail_rcu(&rule->list, &old_rule->list);
2119 list_add_rcu(&rule->list, &chain->rules);
2122 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2130 list_del_rcu(&rule->list);
2132 nf_tables_rule_destroy(&ctx, rule);
2134 for (i = 0; i < n; i++) {
2135 if (info[i].ops != NULL)
2136 module_put(info[i].ops->type->owner);
2141 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
2142 const struct nlmsghdr *nlh,
2143 const struct nlattr * const nla[])
2145 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2146 struct nft_af_info *afi;
2147 struct net *net = sock_net(skb->sk);
2148 struct nft_table *table;
2149 struct nft_chain *chain = NULL;
2150 struct nft_rule *rule;
2151 int family = nfmsg->nfgen_family, err = 0;
2154 afi = nf_tables_afinfo_lookup(net, family, false);
2156 return PTR_ERR(afi);
2158 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
2160 return PTR_ERR(table);
2161 if (table->flags & NFT_TABLE_INACTIVE)
2164 if (nla[NFTA_RULE_CHAIN]) {
2165 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2167 return PTR_ERR(chain);
2170 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
2173 if (nla[NFTA_RULE_HANDLE]) {
2174 rule = nf_tables_rule_lookup(chain,
2175 nla[NFTA_RULE_HANDLE]);
2177 return PTR_ERR(rule);
2179 err = nft_delrule(&ctx, rule);
2181 err = nft_delrule_by_chain(&ctx);
2184 list_for_each_entry(chain, &table->chains, list) {
2186 err = nft_delrule_by_chain(&ctx);
2199 static LIST_HEAD(nf_tables_set_ops);
2201 int nft_register_set(struct nft_set_ops *ops)
2203 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2204 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2205 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2208 EXPORT_SYMBOL_GPL(nft_register_set);
2210 void nft_unregister_set(struct nft_set_ops *ops)
2212 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2213 list_del_rcu(&ops->list);
2214 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2216 EXPORT_SYMBOL_GPL(nft_unregister_set);
2219 * Select a set implementation based on the data characteristics and the
2220 * given policy. The total memory use might not be known if no size is
2221 * given, in that case the amount of memory per element is used.
2223 static const struct nft_set_ops *
2224 nft_select_set_ops(const struct nlattr * const nla[],
2225 const struct nft_set_desc *desc,
2226 enum nft_set_policies policy)
2228 const struct nft_set_ops *ops, *bops;
2229 struct nft_set_estimate est, best;
2232 #ifdef CONFIG_MODULES
2233 if (list_empty(&nf_tables_set_ops)) {
2234 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2235 request_module("nft-set");
2236 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2237 if (!list_empty(&nf_tables_set_ops))
2238 return ERR_PTR(-EAGAIN);
2242 if (nla[NFTA_SET_FLAGS] != NULL) {
2243 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2244 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2251 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2252 if ((ops->features & features) != features)
2254 if (!ops->estimate(desc, features, &est))
2258 case NFT_SET_POL_PERFORMANCE:
2259 if (est.class < best.class)
2261 if (est.class == best.class && est.size < best.size)
2264 case NFT_SET_POL_MEMORY:
2265 if (est.size < best.size)
2267 if (est.size == best.size && est.class < best.class)
2274 if (!try_module_get(ops->owner))
2277 module_put(bops->owner);
2286 return ERR_PTR(-EOPNOTSUPP);
2289 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2290 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2291 [NFTA_SET_NAME] = { .type = NLA_STRING,
2292 .len = IFNAMSIZ - 1 },
2293 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2294 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2295 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2296 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2297 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2298 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2299 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2300 [NFTA_SET_ID] = { .type = NLA_U32 },
2301 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2302 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2305 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2306 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2309 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2310 const struct sk_buff *skb,
2311 const struct nlmsghdr *nlh,
2312 const struct nlattr * const nla[])
2314 struct net *net = sock_net(skb->sk);
2315 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2316 struct nft_af_info *afi = NULL;
2317 struct nft_table *table = NULL;
2319 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2320 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2322 return PTR_ERR(afi);
2325 if (nla[NFTA_SET_TABLE] != NULL) {
2327 return -EAFNOSUPPORT;
2329 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2331 return PTR_ERR(table);
2332 if (table->flags & NFT_TABLE_INACTIVE)
2336 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2340 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2341 const struct nlattr *nla)
2343 struct nft_set *set;
2346 return ERR_PTR(-EINVAL);
2348 list_for_each_entry(set, &table->sets, list) {
2349 if (!nla_strcmp(nla, set->name))
2352 return ERR_PTR(-ENOENT);
2355 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2356 const struct nlattr *nla)
2358 struct nft_trans *trans;
2359 u32 id = ntohl(nla_get_be32(nla));
2361 list_for_each_entry(trans, &net->nft.commit_list, list) {
2362 if (trans->msg_type == NFT_MSG_NEWSET &&
2363 id == nft_trans_set_id(trans))
2364 return nft_trans_set(trans);
2366 return ERR_PTR(-ENOENT);
2369 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2372 const struct nft_set *i;
2374 unsigned long *inuse;
2375 unsigned int n = 0, min = 0;
2377 p = strnchr(name, IFNAMSIZ, '%');
2379 if (p[1] != 'd' || strchr(p + 2, '%'))
2382 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2386 list_for_each_entry(i, &ctx->table->sets, list) {
2389 if (!sscanf(i->name, name, &tmp))
2391 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2394 set_bit(tmp - min, inuse);
2397 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2398 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2399 min += BITS_PER_BYTE * PAGE_SIZE;
2400 memset(inuse, 0, PAGE_SIZE);
2403 free_page((unsigned long)inuse);
2406 snprintf(set->name, sizeof(set->name), name, min + n);
2407 list_for_each_entry(i, &ctx->table->sets, list) {
2408 if (!strcmp(set->name, i->name))
2414 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2415 const struct nft_set *set, u16 event, u16 flags)
2417 struct nfgenmsg *nfmsg;
2418 struct nlmsghdr *nlh;
2419 struct nlattr *desc;
2420 u32 portid = ctx->portid;
2423 event |= NFNL_SUBSYS_NFTABLES << 8;
2424 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2427 goto nla_put_failure;
2429 nfmsg = nlmsg_data(nlh);
2430 nfmsg->nfgen_family = ctx->afi->family;
2431 nfmsg->version = NFNETLINK_V0;
2432 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2434 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2435 goto nla_put_failure;
2436 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2437 goto nla_put_failure;
2438 if (set->flags != 0)
2439 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2440 goto nla_put_failure;
2442 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2443 goto nla_put_failure;
2444 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2445 goto nla_put_failure;
2446 if (set->flags & NFT_SET_MAP) {
2447 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2448 goto nla_put_failure;
2449 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2450 goto nla_put_failure;
2454 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout)))
2455 goto nla_put_failure;
2457 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2458 goto nla_put_failure;
2460 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2461 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2462 goto nla_put_failure;
2465 desc = nla_nest_start(skb, NFTA_SET_DESC);
2467 goto nla_put_failure;
2469 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2470 goto nla_put_failure;
2471 nla_nest_end(skb, desc);
2473 nlmsg_end(skb, nlh);
2477 nlmsg_trim(skb, nlh);
2481 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2482 const struct nft_set *set,
2483 int event, gfp_t gfp_flags)
2485 struct sk_buff *skb;
2486 u32 portid = ctx->portid;
2490 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2494 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2498 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2504 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2505 ctx->report, gfp_flags);
2508 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2512 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2514 const struct nft_set *set;
2515 unsigned int idx, s_idx = cb->args[0];
2516 struct nft_af_info *afi;
2517 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2518 struct net *net = sock_net(skb->sk);
2519 int cur_family = cb->args[3];
2520 struct nft_ctx *ctx = cb->data, ctx_set;
2526 cb->seq = net->nft.base_seq;
2528 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2529 if (ctx->afi && ctx->afi != afi)
2533 if (afi->family != cur_family)
2538 list_for_each_entry_rcu(table, &afi->tables, list) {
2539 if (ctx->table && ctx->table != table)
2543 if (cur_table != table)
2549 list_for_each_entry_rcu(set, &table->sets, list) {
2554 ctx_set.table = table;
2556 if (nf_tables_fill_set(skb, &ctx_set, set,
2560 cb->args[2] = (unsigned long) table;
2561 cb->args[3] = afi->family;
2564 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2578 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2584 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2585 const struct nlmsghdr *nlh,
2586 const struct nlattr * const nla[])
2588 const struct nft_set *set;
2590 struct sk_buff *skb2;
2591 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2594 /* Verify existence before starting dump */
2595 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2599 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2600 struct netlink_dump_control c = {
2601 .dump = nf_tables_dump_sets,
2602 .done = nf_tables_dump_sets_done,
2604 struct nft_ctx *ctx_dump;
2606 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2607 if (ctx_dump == NULL)
2613 return netlink_dump_start(nlsk, skb, nlh, &c);
2616 /* Only accept unspec with dump */
2617 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2618 return -EAFNOSUPPORT;
2620 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2622 return PTR_ERR(set);
2623 if (set->flags & NFT_SET_INACTIVE)
2626 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2630 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2634 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2641 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2642 struct nft_set_desc *desc,
2643 const struct nlattr *nla)
2645 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2648 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2652 if (da[NFTA_SET_DESC_SIZE] != NULL)
2653 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2658 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2659 const struct nlmsghdr *nlh,
2660 const struct nlattr * const nla[])
2662 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2663 const struct nft_set_ops *ops;
2664 struct nft_af_info *afi;
2665 struct net *net = sock_net(skb->sk);
2666 struct nft_table *table;
2667 struct nft_set *set;
2669 char name[IFNAMSIZ];
2673 u32 ktype, dtype, flags, policy, gc_int;
2674 struct nft_set_desc desc;
2677 if (nla[NFTA_SET_TABLE] == NULL ||
2678 nla[NFTA_SET_NAME] == NULL ||
2679 nla[NFTA_SET_KEY_LEN] == NULL ||
2680 nla[NFTA_SET_ID] == NULL)
2683 memset(&desc, 0, sizeof(desc));
2685 ktype = NFT_DATA_VALUE;
2686 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2687 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2688 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2692 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2693 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2697 if (nla[NFTA_SET_FLAGS] != NULL) {
2698 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2699 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2700 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2701 NFT_SET_MAP | NFT_SET_EVAL))
2703 /* Only one of both operations is supported */
2704 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2705 (NFT_SET_MAP | NFT_SET_EVAL))
2710 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2711 if (!(flags & NFT_SET_MAP))
2714 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2715 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2716 dtype != NFT_DATA_VERDICT)
2719 if (dtype != NFT_DATA_VERDICT) {
2720 if (nla[NFTA_SET_DATA_LEN] == NULL)
2722 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2723 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2726 desc.dlen = sizeof(struct nft_verdict);
2727 } else if (flags & NFT_SET_MAP)
2731 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2732 if (!(flags & NFT_SET_TIMEOUT))
2734 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2737 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2738 if (!(flags & NFT_SET_TIMEOUT))
2740 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2743 policy = NFT_SET_POL_PERFORMANCE;
2744 if (nla[NFTA_SET_POLICY] != NULL)
2745 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2747 if (nla[NFTA_SET_DESC] != NULL) {
2748 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2753 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2755 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2757 return PTR_ERR(afi);
2759 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2761 return PTR_ERR(table);
2763 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2765 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2767 if (PTR_ERR(set) != -ENOENT)
2768 return PTR_ERR(set);
2773 if (nlh->nlmsg_flags & NLM_F_EXCL)
2775 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2780 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2783 ops = nft_select_set_ops(nla, &desc, policy);
2785 return PTR_ERR(ops);
2788 if (ops->privsize != NULL)
2789 size = ops->privsize(nla);
2792 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2796 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2797 err = nf_tables_set_alloc_name(&ctx, set, name);
2801 INIT_LIST_HEAD(&set->bindings);
2802 write_pnet(&set->pnet, net);
2805 set->klen = desc.klen;
2807 set->dlen = desc.dlen;
2809 set->size = desc.size;
2810 set->policy = policy;
2811 set->timeout = timeout;
2812 set->gc_int = gc_int;
2814 err = ops->init(set, &desc, nla);
2818 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2822 list_add_tail_rcu(&set->list, &table->sets);
2829 module_put(ops->owner);
2833 static void nft_set_destroy(struct nft_set *set)
2835 set->ops->destroy(set);
2836 module_put(set->ops->owner);
2840 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2842 list_del_rcu(&set->list);
2843 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2844 nft_set_destroy(set);
2847 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2848 const struct nlmsghdr *nlh,
2849 const struct nlattr * const nla[])
2851 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2852 struct nft_set *set;
2856 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2857 return -EAFNOSUPPORT;
2858 if (nla[NFTA_SET_TABLE] == NULL)
2861 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2865 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2867 return PTR_ERR(set);
2868 if (set->flags & NFT_SET_INACTIVE)
2870 if (!list_empty(&set->bindings))
2873 return nft_delset(&ctx, set);
2876 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2877 const struct nft_set *set,
2878 const struct nft_set_iter *iter,
2879 const struct nft_set_elem *elem)
2881 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
2882 enum nft_registers dreg;
2884 dreg = nft_type_to_reg(set->dtype);
2885 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
2886 set->dtype == NFT_DATA_VERDICT ?
2887 NFT_DATA_VERDICT : NFT_DATA_VALUE,
2891 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2892 struct nft_set_binding *binding)
2894 struct nft_set_binding *i;
2895 struct nft_set_iter iter;
2897 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2900 if (binding->flags & NFT_SET_MAP) {
2901 /* If the set is already bound to the same chain all
2902 * jumps are already validated for that chain.
2904 list_for_each_entry(i, &set->bindings, list) {
2905 if (binding->flags & NFT_SET_MAP &&
2906 i->chain == binding->chain)
2913 iter.fn = nf_tables_bind_check_setelem;
2915 set->ops->walk(ctx, set, &iter);
2917 /* Destroy anonymous sets if binding fails */
2918 if (set->flags & NFT_SET_ANONYMOUS)
2919 nf_tables_set_destroy(ctx, set);
2925 binding->chain = ctx->chain;
2926 list_add_tail_rcu(&binding->list, &set->bindings);
2930 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2931 struct nft_set_binding *binding)
2933 list_del_rcu(&binding->list);
2935 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2936 !(set->flags & NFT_SET_INACTIVE))
2937 nf_tables_set_destroy(ctx, set);
2940 const struct nft_set_ext_type nft_set_ext_types[] = {
2941 [NFT_SET_EXT_KEY] = {
2942 .align = __alignof__(u32),
2944 [NFT_SET_EXT_DATA] = {
2945 .align = __alignof__(u32),
2947 [NFT_SET_EXT_EXPR] = {
2948 .align = __alignof__(struct nft_expr),
2950 [NFT_SET_EXT_FLAGS] = {
2952 .align = __alignof__(u8),
2954 [NFT_SET_EXT_TIMEOUT] = {
2956 .align = __alignof__(u64),
2958 [NFT_SET_EXT_EXPIRATION] = {
2959 .len = sizeof(unsigned long),
2960 .align = __alignof__(unsigned long),
2962 [NFT_SET_EXT_USERDATA] = {
2963 .len = sizeof(struct nft_userdata),
2964 .align = __alignof__(struct nft_userdata),
2967 EXPORT_SYMBOL_GPL(nft_set_ext_types);
2973 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2974 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2975 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2976 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2977 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
2978 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
2979 .len = NFT_USERDATA_MAXLEN },
2982 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2983 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2984 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2985 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2986 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2989 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2990 const struct sk_buff *skb,
2991 const struct nlmsghdr *nlh,
2992 const struct nlattr * const nla[],
2995 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2996 struct nft_af_info *afi;
2997 struct nft_table *table;
2998 struct net *net = sock_net(skb->sk);
3000 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3002 return PTR_ERR(afi);
3004 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
3006 return PTR_ERR(table);
3007 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
3010 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
3014 static int nf_tables_fill_setelem(struct sk_buff *skb,
3015 const struct nft_set *set,
3016 const struct nft_set_elem *elem)
3018 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3019 unsigned char *b = skb_tail_pointer(skb);
3020 struct nlattr *nest;
3022 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3024 goto nla_put_failure;
3026 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3027 NFT_DATA_VALUE, set->klen) < 0)
3028 goto nla_put_failure;
3030 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3031 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3032 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3034 goto nla_put_failure;
3036 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3037 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3038 goto nla_put_failure;
3040 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3041 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3042 htonl(*nft_set_ext_flags(ext))))
3043 goto nla_put_failure;
3045 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3046 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3047 cpu_to_be64(*nft_set_ext_timeout(ext))))
3048 goto nla_put_failure;
3050 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3051 unsigned long expires, now = jiffies;
3053 expires = *nft_set_ext_expiration(ext);
3054 if (time_before(now, expires))
3059 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3060 cpu_to_be64(jiffies_to_msecs(expires))))
3061 goto nla_put_failure;
3064 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3065 struct nft_userdata *udata;
3067 udata = nft_set_ext_userdata(ext);
3068 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3069 udata->len + 1, udata->data))
3070 goto nla_put_failure;
3073 nla_nest_end(skb, nest);
3081 struct nft_set_dump_args {
3082 const struct netlink_callback *cb;
3083 struct nft_set_iter iter;
3084 struct sk_buff *skb;
3087 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3088 const struct nft_set *set,
3089 const struct nft_set_iter *iter,
3090 const struct nft_set_elem *elem)
3092 struct nft_set_dump_args *args;
3094 args = container_of(iter, struct nft_set_dump_args, iter);
3095 return nf_tables_fill_setelem(args->skb, set, elem);
3098 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3100 const struct nft_set *set;
3101 struct nft_set_dump_args args;
3103 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3104 struct nfgenmsg *nfmsg;
3105 struct nlmsghdr *nlh;
3106 struct nlattr *nest;
3110 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3111 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3115 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
3120 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3122 return PTR_ERR(set);
3123 if (set->flags & NFT_SET_INACTIVE)
3126 event = NFT_MSG_NEWSETELEM;
3127 event |= NFNL_SUBSYS_NFTABLES << 8;
3128 portid = NETLINK_CB(cb->skb).portid;
3129 seq = cb->nlh->nlmsg_seq;
3131 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3134 goto nla_put_failure;
3136 nfmsg = nlmsg_data(nlh);
3137 nfmsg->nfgen_family = ctx.afi->family;
3138 nfmsg->version = NFNETLINK_V0;
3139 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3141 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3142 goto nla_put_failure;
3143 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3144 goto nla_put_failure;
3146 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3148 goto nla_put_failure;
3152 args.iter.skip = cb->args[0];
3153 args.iter.count = 0;
3155 args.iter.fn = nf_tables_dump_setelem;
3156 set->ops->walk(&ctx, set, &args.iter);
3158 nla_nest_end(skb, nest);
3159 nlmsg_end(skb, nlh);
3161 if (args.iter.err && args.iter.err != -EMSGSIZE)
3162 return args.iter.err;
3163 if (args.iter.count == cb->args[0])
3166 cb->args[0] = args.iter.count;
3173 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
3174 const struct nlmsghdr *nlh,
3175 const struct nlattr * const nla[])
3177 const struct nft_set *set;
3181 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3185 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3187 return PTR_ERR(set);
3188 if (set->flags & NFT_SET_INACTIVE)
3191 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3192 struct netlink_dump_control c = {
3193 .dump = nf_tables_dump_set,
3195 return netlink_dump_start(nlsk, skb, nlh, &c);
3200 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3201 const struct nft_ctx *ctx, u32 seq,
3202 u32 portid, int event, u16 flags,
3203 const struct nft_set *set,
3204 const struct nft_set_elem *elem)
3206 struct nfgenmsg *nfmsg;
3207 struct nlmsghdr *nlh;
3208 struct nlattr *nest;
3211 event |= NFNL_SUBSYS_NFTABLES << 8;
3212 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3215 goto nla_put_failure;
3217 nfmsg = nlmsg_data(nlh);
3218 nfmsg->nfgen_family = ctx->afi->family;
3219 nfmsg->version = NFNETLINK_V0;
3220 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3222 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3223 goto nla_put_failure;
3224 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3225 goto nla_put_failure;
3227 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3229 goto nla_put_failure;
3231 err = nf_tables_fill_setelem(skb, set, elem);
3233 goto nla_put_failure;
3235 nla_nest_end(skb, nest);
3237 nlmsg_end(skb, nlh);
3241 nlmsg_trim(skb, nlh);
3245 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3246 const struct nft_set *set,
3247 const struct nft_set_elem *elem,
3248 int event, u16 flags)
3250 struct net *net = ctx->net;
3251 u32 portid = ctx->portid;
3252 struct sk_buff *skb;
3255 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3259 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3263 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3270 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3274 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3278 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3280 struct nft_set *set)
3282 struct nft_trans *trans;
3284 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3288 nft_trans_elem_set(trans) = set;
3292 void *nft_set_elem_init(const struct nft_set *set,
3293 const struct nft_set_ext_tmpl *tmpl,
3294 const u32 *key, const u32 *data,
3295 u64 timeout, gfp_t gfp)
3297 struct nft_set_ext *ext;
3300 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3304 ext = nft_set_elem_ext(set, elem);
3305 nft_set_ext_init(ext, tmpl);
3307 memcpy(nft_set_ext_key(ext), key, set->klen);
3308 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3309 memcpy(nft_set_ext_data(ext), data, set->dlen);
3310 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3311 *nft_set_ext_expiration(ext) =
3312 jiffies + msecs_to_jiffies(timeout);
3313 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3314 *nft_set_ext_timeout(ext) = timeout;
3319 void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3321 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3323 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3324 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3325 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3326 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3327 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3331 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3333 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3334 const struct nlattr *attr)
3336 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3337 struct nft_data_desc d1, d2;
3338 struct nft_set_ext_tmpl tmpl;
3339 struct nft_set_ext *ext;
3340 struct nft_set_elem elem;
3341 struct nft_set_binding *binding;
3342 struct nft_userdata *udata;
3343 struct nft_data data;
3344 enum nft_registers dreg;
3345 struct nft_trans *trans;
3351 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3352 nft_set_elem_policy);
3356 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3359 nft_set_ext_prepare(&tmpl);
3362 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3363 flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3364 if (flags & ~NFT_SET_ELEM_INTERVAL_END)
3366 if (!(set->flags & NFT_SET_INTERVAL) &&
3367 flags & NFT_SET_ELEM_INTERVAL_END)
3370 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3373 if (set->flags & NFT_SET_MAP) {
3374 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3375 !(flags & NFT_SET_ELEM_INTERVAL_END))
3377 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3378 flags & NFT_SET_ELEM_INTERVAL_END)
3381 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3386 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3387 if (!(set->flags & NFT_SET_TIMEOUT))
3389 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3390 } else if (set->flags & NFT_SET_TIMEOUT) {
3391 timeout = set->timeout;
3394 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3395 nla[NFTA_SET_ELEM_KEY]);
3399 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3402 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3404 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3405 if (timeout != set->timeout)
3406 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3409 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3410 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3411 nla[NFTA_SET_ELEM_DATA]);
3416 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3419 dreg = nft_type_to_reg(set->dtype);
3420 list_for_each_entry(binding, &set->bindings, list) {
3421 struct nft_ctx bind_ctx = {
3423 .table = ctx->table,
3424 .chain = (struct nft_chain *)binding->chain,
3427 if (!(binding->flags & NFT_SET_MAP))
3430 err = nft_validate_register_store(&bind_ctx, dreg,
3437 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3440 /* The full maximum length of userdata can exceed the maximum
3441 * offset value (U8_MAX) for following extensions, therefor it
3442 * must be the last extension added.
3445 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3446 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3448 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3453 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3454 timeout, GFP_KERNEL);
3455 if (elem.priv == NULL)
3458 ext = nft_set_elem_ext(set, elem.priv);
3460 *nft_set_ext_flags(ext) = flags;
3462 udata = nft_set_ext_userdata(ext);
3463 udata->len = ulen - 1;
3464 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3467 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3471 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3472 err = set->ops->insert(set, &elem);
3476 nft_trans_elem(trans) = elem;
3477 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3485 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3486 nft_data_uninit(&data, d2.type);
3488 nft_data_uninit(&elem.key.val, d1.type);
3493 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3494 const struct nlmsghdr *nlh,
3495 const struct nlattr * const nla[])
3497 struct net *net = sock_net(skb->sk);
3498 const struct nlattr *attr;
3499 struct nft_set *set;
3503 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3506 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3510 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3512 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3513 set = nf_tables_set_lookup_byid(net,
3514 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3517 return PTR_ERR(set);
3520 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3523 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3525 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3528 err = nft_add_set_elem(&ctx, set, attr);
3530 atomic_dec(&set->nelems);
3537 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3538 const struct nlattr *attr)
3540 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3541 struct nft_data_desc desc;
3542 struct nft_set_elem elem;
3543 struct nft_trans *trans;
3546 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3547 nft_set_elem_policy);
3552 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3555 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3556 nla[NFTA_SET_ELEM_KEY]);
3561 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3564 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3565 if (trans == NULL) {
3570 elem.priv = set->ops->deactivate(set, &elem);
3571 if (elem.priv == NULL) {
3576 nft_trans_elem(trans) = elem;
3577 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3583 nft_data_uninit(&elem.key.val, desc.type);
3588 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3589 const struct nlmsghdr *nlh,
3590 const struct nlattr * const nla[])
3592 const struct nlattr *attr;
3593 struct nft_set *set;
3597 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3600 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3604 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3606 return PTR_ERR(set);
3607 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3610 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3611 err = nft_del_setelem(&ctx, set, attr);
3620 void nft_set_gc_batch_release(struct rcu_head *rcu)
3622 struct nft_set_gc_batch *gcb;
3625 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3626 for (i = 0; i < gcb->head.cnt; i++)
3627 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3630 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3632 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3635 struct nft_set_gc_batch *gcb;
3637 gcb = kzalloc(sizeof(*gcb), gfp);
3640 gcb->head.set = set;
3643 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3645 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3646 u32 portid, u32 seq)
3648 struct nlmsghdr *nlh;
3649 struct nfgenmsg *nfmsg;
3650 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3652 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3654 goto nla_put_failure;
3656 nfmsg = nlmsg_data(nlh);
3657 nfmsg->nfgen_family = AF_UNSPEC;
3658 nfmsg->version = NFNETLINK_V0;
3659 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3661 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3662 goto nla_put_failure;
3664 nlmsg_end(skb, nlh);
3668 nlmsg_trim(skb, nlh);
3672 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3674 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3675 struct sk_buff *skb2;
3678 if (nlmsg_report(nlh) &&
3679 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3683 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3687 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3694 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3695 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3698 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3704 static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb,
3705 const struct nlmsghdr *nlh,
3706 const struct nlattr * const nla[])
3708 struct net *net = sock_net(skb->sk);
3709 struct sk_buff *skb2;
3712 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3716 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3721 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3727 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3728 [NFT_MSG_NEWTABLE] = {
3729 .call_batch = nf_tables_newtable,
3730 .attr_count = NFTA_TABLE_MAX,
3731 .policy = nft_table_policy,
3733 [NFT_MSG_GETTABLE] = {
3734 .call = nf_tables_gettable,
3735 .attr_count = NFTA_TABLE_MAX,
3736 .policy = nft_table_policy,
3738 [NFT_MSG_DELTABLE] = {
3739 .call_batch = nf_tables_deltable,
3740 .attr_count = NFTA_TABLE_MAX,
3741 .policy = nft_table_policy,
3743 [NFT_MSG_NEWCHAIN] = {
3744 .call_batch = nf_tables_newchain,
3745 .attr_count = NFTA_CHAIN_MAX,
3746 .policy = nft_chain_policy,
3748 [NFT_MSG_GETCHAIN] = {
3749 .call = nf_tables_getchain,
3750 .attr_count = NFTA_CHAIN_MAX,
3751 .policy = nft_chain_policy,
3753 [NFT_MSG_DELCHAIN] = {
3754 .call_batch = nf_tables_delchain,
3755 .attr_count = NFTA_CHAIN_MAX,
3756 .policy = nft_chain_policy,
3758 [NFT_MSG_NEWRULE] = {
3759 .call_batch = nf_tables_newrule,
3760 .attr_count = NFTA_RULE_MAX,
3761 .policy = nft_rule_policy,
3763 [NFT_MSG_GETRULE] = {
3764 .call = nf_tables_getrule,
3765 .attr_count = NFTA_RULE_MAX,
3766 .policy = nft_rule_policy,
3768 [NFT_MSG_DELRULE] = {
3769 .call_batch = nf_tables_delrule,
3770 .attr_count = NFTA_RULE_MAX,
3771 .policy = nft_rule_policy,
3773 [NFT_MSG_NEWSET] = {
3774 .call_batch = nf_tables_newset,
3775 .attr_count = NFTA_SET_MAX,
3776 .policy = nft_set_policy,
3778 [NFT_MSG_GETSET] = {
3779 .call = nf_tables_getset,
3780 .attr_count = NFTA_SET_MAX,
3781 .policy = nft_set_policy,
3783 [NFT_MSG_DELSET] = {
3784 .call_batch = nf_tables_delset,
3785 .attr_count = NFTA_SET_MAX,
3786 .policy = nft_set_policy,
3788 [NFT_MSG_NEWSETELEM] = {
3789 .call_batch = nf_tables_newsetelem,
3790 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3791 .policy = nft_set_elem_list_policy,
3793 [NFT_MSG_GETSETELEM] = {
3794 .call = nf_tables_getsetelem,
3795 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3796 .policy = nft_set_elem_list_policy,
3798 [NFT_MSG_DELSETELEM] = {
3799 .call_batch = nf_tables_delsetelem,
3800 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3801 .policy = nft_set_elem_list_policy,
3803 [NFT_MSG_GETGEN] = {
3804 .call = nf_tables_getgen,
3808 static void nft_chain_commit_update(struct nft_trans *trans)
3810 struct nft_base_chain *basechain;
3812 if (nft_trans_chain_name(trans)[0])
3813 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3815 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3818 basechain = nft_base_chain(trans->ctx.chain);
3819 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3821 switch (nft_trans_chain_policy(trans)) {
3824 basechain->policy = nft_trans_chain_policy(trans);
3829 static void nf_tables_commit_release(struct nft_trans *trans)
3831 switch (trans->msg_type) {
3832 case NFT_MSG_DELTABLE:
3833 nf_tables_table_destroy(&trans->ctx);
3835 case NFT_MSG_DELCHAIN:
3836 nf_tables_chain_destroy(trans->ctx.chain);
3838 case NFT_MSG_DELRULE:
3839 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3841 case NFT_MSG_DELSET:
3842 nft_set_destroy(nft_trans_set(trans));
3844 case NFT_MSG_DELSETELEM:
3845 nft_set_elem_destroy(nft_trans_elem_set(trans),
3846 nft_trans_elem(trans).priv);
3852 static int nf_tables_commit(struct sk_buff *skb)
3854 struct net *net = sock_net(skb->sk);
3855 struct nft_trans *trans, *next;
3856 struct nft_trans_elem *te;
3858 /* Bump generation counter, invalidate any dump in progress */
3859 while (++net->nft.base_seq == 0);
3861 /* A new generation has just started */
3862 net->nft.gencursor = nft_gencursor_next(net);
3864 /* Make sure all packets have left the previous generation before
3865 * purging old rules.
3869 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3870 switch (trans->msg_type) {
3871 case NFT_MSG_NEWTABLE:
3872 if (nft_trans_table_update(trans)) {
3873 if (!nft_trans_table_enable(trans)) {
3874 nf_tables_table_disable(trans->ctx.afi,
3876 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3879 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3881 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3882 nft_trans_destroy(trans);
3884 case NFT_MSG_DELTABLE:
3885 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3887 case NFT_MSG_NEWCHAIN:
3888 if (nft_trans_chain_update(trans))
3889 nft_chain_commit_update(trans);
3891 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3893 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3894 nft_trans_destroy(trans);
3896 case NFT_MSG_DELCHAIN:
3897 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3898 nf_tables_unregister_hooks(trans->ctx.table,
3900 trans->ctx.afi->nops);
3902 case NFT_MSG_NEWRULE:
3903 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3904 nf_tables_rule_notify(&trans->ctx,
3905 nft_trans_rule(trans),
3907 nft_trans_destroy(trans);
3909 case NFT_MSG_DELRULE:
3910 list_del_rcu(&nft_trans_rule(trans)->list);
3911 nf_tables_rule_notify(&trans->ctx,
3912 nft_trans_rule(trans),
3915 case NFT_MSG_NEWSET:
3916 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3917 /* This avoids hitting -EBUSY when deleting the table
3918 * from the transaction.
3920 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3921 !list_empty(&nft_trans_set(trans)->bindings))
3922 trans->ctx.table->use--;
3924 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3925 NFT_MSG_NEWSET, GFP_KERNEL);
3926 nft_trans_destroy(trans);
3928 case NFT_MSG_DELSET:
3929 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3930 NFT_MSG_DELSET, GFP_KERNEL);
3932 case NFT_MSG_NEWSETELEM:
3933 te = (struct nft_trans_elem *)trans->data;
3935 te->set->ops->activate(te->set, &te->elem);
3936 nf_tables_setelem_notify(&trans->ctx, te->set,
3938 NFT_MSG_NEWSETELEM, 0);
3939 nft_trans_destroy(trans);
3941 case NFT_MSG_DELSETELEM:
3942 te = (struct nft_trans_elem *)trans->data;
3944 nf_tables_setelem_notify(&trans->ctx, te->set,
3946 NFT_MSG_DELSETELEM, 0);
3947 te->set->ops->remove(te->set, &te->elem);
3948 atomic_dec(&te->set->nelems);
3956 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3957 list_del(&trans->list);
3958 nf_tables_commit_release(trans);
3961 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
3966 static void nf_tables_abort_release(struct nft_trans *trans)
3968 switch (trans->msg_type) {
3969 case NFT_MSG_NEWTABLE:
3970 nf_tables_table_destroy(&trans->ctx);
3972 case NFT_MSG_NEWCHAIN:
3973 nf_tables_chain_destroy(trans->ctx.chain);
3975 case NFT_MSG_NEWRULE:
3976 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3978 case NFT_MSG_NEWSET:
3979 nft_set_destroy(nft_trans_set(trans));
3981 case NFT_MSG_NEWSETELEM:
3982 nft_set_elem_destroy(nft_trans_elem_set(trans),
3983 nft_trans_elem(trans).priv);
3989 static int nf_tables_abort(struct sk_buff *skb)
3991 struct net *net = sock_net(skb->sk);
3992 struct nft_trans *trans, *next;
3993 struct nft_trans_elem *te;
3995 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3996 switch (trans->msg_type) {
3997 case NFT_MSG_NEWTABLE:
3998 if (nft_trans_table_update(trans)) {
3999 if (nft_trans_table_enable(trans)) {
4000 nf_tables_table_disable(trans->ctx.afi,
4002 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4004 nft_trans_destroy(trans);
4006 list_del_rcu(&trans->ctx.table->list);
4009 case NFT_MSG_DELTABLE:
4010 list_add_tail_rcu(&trans->ctx.table->list,
4011 &trans->ctx.afi->tables);
4012 nft_trans_destroy(trans);
4014 case NFT_MSG_NEWCHAIN:
4015 if (nft_trans_chain_update(trans)) {
4016 free_percpu(nft_trans_chain_stats(trans));
4018 nft_trans_destroy(trans);
4020 trans->ctx.table->use--;
4021 list_del_rcu(&trans->ctx.chain->list);
4022 nf_tables_unregister_hooks(trans->ctx.table,
4024 trans->ctx.afi->nops);
4027 case NFT_MSG_DELCHAIN:
4028 trans->ctx.table->use++;
4029 list_add_tail_rcu(&trans->ctx.chain->list,
4030 &trans->ctx.table->chains);
4031 nft_trans_destroy(trans);
4033 case NFT_MSG_NEWRULE:
4034 trans->ctx.chain->use--;
4035 list_del_rcu(&nft_trans_rule(trans)->list);
4037 case NFT_MSG_DELRULE:
4038 trans->ctx.chain->use++;
4039 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
4040 nft_trans_destroy(trans);
4042 case NFT_MSG_NEWSET:
4043 trans->ctx.table->use--;
4044 list_del_rcu(&nft_trans_set(trans)->list);
4046 case NFT_MSG_DELSET:
4047 trans->ctx.table->use++;
4048 list_add_tail_rcu(&nft_trans_set(trans)->list,
4049 &trans->ctx.table->sets);
4050 nft_trans_destroy(trans);
4052 case NFT_MSG_NEWSETELEM:
4053 te = (struct nft_trans_elem *)trans->data;
4055 te->set->ops->remove(te->set, &te->elem);
4056 atomic_dec(&te->set->nelems);
4058 case NFT_MSG_DELSETELEM:
4059 te = (struct nft_trans_elem *)trans->data;
4061 te->set->ops->activate(te->set, &te->elem);
4064 nft_trans_destroy(trans);
4071 list_for_each_entry_safe_reverse(trans, next,
4072 &net->nft.commit_list, list) {
4073 list_del(&trans->list);
4074 nf_tables_abort_release(trans);
4080 static const struct nfnetlink_subsystem nf_tables_subsys = {
4081 .name = "nf_tables",
4082 .subsys_id = NFNL_SUBSYS_NFTABLES,
4083 .cb_count = NFT_MSG_MAX,
4085 .commit = nf_tables_commit,
4086 .abort = nf_tables_abort,
4089 int nft_chain_validate_dependency(const struct nft_chain *chain,
4090 enum nft_chain_type type)
4092 const struct nft_base_chain *basechain;
4094 if (chain->flags & NFT_BASE_CHAIN) {
4095 basechain = nft_base_chain(chain);
4096 if (basechain->type->type != type)
4101 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4103 int nft_chain_validate_hooks(const struct nft_chain *chain,
4104 unsigned int hook_flags)
4106 struct nft_base_chain *basechain;
4108 if (chain->flags & NFT_BASE_CHAIN) {
4109 basechain = nft_base_chain(chain);
4111 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4119 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4122 * Loop detection - walk through the ruleset beginning at the destination chain
4123 * of a new jump until either the source chain is reached (loop) or all
4124 * reachable chains have been traversed.
4126 * The loop check is performed whenever a new jump verdict is added to an
4127 * expression or verdict map or a verdict map is bound to a new chain.
4130 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4131 const struct nft_chain *chain);
4133 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4134 const struct nft_set *set,
4135 const struct nft_set_iter *iter,
4136 const struct nft_set_elem *elem)
4138 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4139 const struct nft_data *data;
4141 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4142 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
4145 data = nft_set_ext_data(ext);
4146 switch (data->verdict.code) {
4149 return nf_tables_check_loops(ctx, data->verdict.chain);
4155 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4156 const struct nft_chain *chain)
4158 const struct nft_rule *rule;
4159 const struct nft_expr *expr, *last;
4160 const struct nft_set *set;
4161 struct nft_set_binding *binding;
4162 struct nft_set_iter iter;
4164 if (ctx->chain == chain)
4167 list_for_each_entry(rule, &chain->rules, list) {
4168 nft_rule_for_each_expr(expr, last, rule) {
4169 const struct nft_data *data = NULL;
4172 if (!expr->ops->validate)
4175 err = expr->ops->validate(ctx, expr, &data);
4182 switch (data->verdict.code) {
4185 err = nf_tables_check_loops(ctx,
4186 data->verdict.chain);
4195 list_for_each_entry(set, &ctx->table->sets, list) {
4196 if (!(set->flags & NFT_SET_MAP) ||
4197 set->dtype != NFT_DATA_VERDICT)
4200 list_for_each_entry(binding, &set->bindings, list) {
4201 if (!(binding->flags & NFT_SET_MAP) ||
4202 binding->chain != chain)
4208 iter.fn = nf_tables_loop_check_setelem;
4210 set->ops->walk(ctx, set, &iter);
4220 * nft_parse_register - parse a register value from a netlink attribute
4222 * @attr: netlink attribute
4224 * Parse and translate a register value from a netlink attribute.
4225 * Registers used to be 128 bit wide, these register numbers will be
4226 * mapped to the corresponding 32 bit register numbers.
4228 unsigned int nft_parse_register(const struct nlattr *attr)
4232 reg = ntohl(nla_get_be32(attr));
4234 case NFT_REG_VERDICT...NFT_REG_4:
4235 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4237 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4240 EXPORT_SYMBOL_GPL(nft_parse_register);
4243 * nft_dump_register - dump a register value to a netlink attribute
4245 * @skb: socket buffer
4246 * @attr: attribute number
4247 * @reg: register number
4249 * Construct a netlink attribute containing the register number. For
4250 * compatibility reasons, register numbers being a multiple of 4 are
4251 * translated to the corresponding 128 bit register numbers.
4253 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4255 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4256 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4258 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4260 return nla_put_be32(skb, attr, htonl(reg));
4262 EXPORT_SYMBOL_GPL(nft_dump_register);
4265 * nft_validate_register_load - validate a load from a register
4267 * @reg: the register number
4268 * @len: the length of the data
4270 * Validate that the input register is one of the general purpose
4271 * registers and that the length of the load is within the bounds.
4273 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
4275 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4279 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
4284 EXPORT_SYMBOL_GPL(nft_validate_register_load);
4287 * nft_validate_register_store - validate an expressions' register store
4289 * @ctx: context of the expression performing the load
4290 * @reg: the destination register number
4291 * @data: the data to load
4292 * @type: the data type
4293 * @len: the length of the data
4295 * Validate that a data load uses the appropriate data type for
4296 * the destination register and the length is within the bounds.
4297 * A value of NULL for the data means that its runtime gathered
4300 int nft_validate_register_store(const struct nft_ctx *ctx,
4301 enum nft_registers reg,
4302 const struct nft_data *data,
4303 enum nft_data_types type, unsigned int len)
4308 case NFT_REG_VERDICT:
4309 if (type != NFT_DATA_VERDICT)
4313 (data->verdict.code == NFT_GOTO ||
4314 data->verdict.code == NFT_JUMP)) {
4315 err = nf_tables_check_loops(ctx, data->verdict.chain);
4319 if (ctx->chain->level + 1 >
4320 data->verdict.chain->level) {
4321 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4323 data->verdict.chain->level = ctx->chain->level + 1;
4329 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4333 if (reg * NFT_REG32_SIZE + len >
4334 FIELD_SIZEOF(struct nft_regs, data))
4337 if (data != NULL && type != NFT_DATA_VALUE)
4342 EXPORT_SYMBOL_GPL(nft_validate_register_store);
4344 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4345 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4346 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4347 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4350 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4351 struct nft_data_desc *desc, const struct nlattr *nla)
4353 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4354 struct nft_chain *chain;
4357 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4361 if (!tb[NFTA_VERDICT_CODE])
4363 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
4365 switch (data->verdict.code) {
4367 switch (data->verdict.code & NF_VERDICT_MASK) {
4382 if (!tb[NFTA_VERDICT_CHAIN])
4384 chain = nf_tables_chain_lookup(ctx->table,
4385 tb[NFTA_VERDICT_CHAIN]);
4387 return PTR_ERR(chain);
4388 if (chain->flags & NFT_BASE_CHAIN)
4392 data->verdict.chain = chain;
4396 desc->len = sizeof(data->verdict);
4397 desc->type = NFT_DATA_VERDICT;
4401 static void nft_verdict_uninit(const struct nft_data *data)
4403 switch (data->verdict.code) {
4406 data->verdict.chain->use--;
4411 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
4413 struct nlattr *nest;
4415 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
4417 goto nla_put_failure;
4419 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict.code)))
4420 goto nla_put_failure;
4422 switch (data->verdict.code) {
4425 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
4426 data->verdict.chain->name))
4427 goto nla_put_failure;
4429 nla_nest_end(skb, nest);
4436 static int nft_value_init(const struct nft_ctx *ctx,
4437 struct nft_data *data, unsigned int size,
4438 struct nft_data_desc *desc, const struct nlattr *nla)
4448 nla_memcpy(data->data, nla, len);
4449 desc->type = NFT_DATA_VALUE;
4454 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4457 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4460 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4461 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
4462 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4466 * nft_data_init - parse nf_tables data netlink attributes
4468 * @ctx: context of the expression using the data
4469 * @data: destination struct nft_data
4470 * @size: maximum data length
4471 * @desc: data description
4472 * @nla: netlink attribute containing data
4474 * Parse the netlink data attributes and initialize a struct nft_data.
4475 * The type and length of data are returned in the data description.
4477 * The caller can indicate that it only wants to accept data of type
4478 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4480 int nft_data_init(const struct nft_ctx *ctx,
4481 struct nft_data *data, unsigned int size,
4482 struct nft_data_desc *desc, const struct nlattr *nla)
4484 struct nlattr *tb[NFTA_DATA_MAX + 1];
4487 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4491 if (tb[NFTA_DATA_VALUE])
4492 return nft_value_init(ctx, data, size, desc,
4493 tb[NFTA_DATA_VALUE]);
4494 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4495 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4498 EXPORT_SYMBOL_GPL(nft_data_init);
4501 * nft_data_uninit - release a nft_data item
4503 * @data: struct nft_data to release
4504 * @type: type of data
4506 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4507 * all others need to be released by calling this function.
4509 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4511 if (type < NFT_DATA_VERDICT)
4514 case NFT_DATA_VERDICT:
4515 return nft_verdict_uninit(data);
4520 EXPORT_SYMBOL_GPL(nft_data_uninit);
4522 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4523 enum nft_data_types type, unsigned int len)
4525 struct nlattr *nest;
4528 nest = nla_nest_start(skb, attr);
4533 case NFT_DATA_VALUE:
4534 err = nft_value_dump(skb, data, len);
4536 case NFT_DATA_VERDICT:
4537 err = nft_verdict_dump(skb, data);
4544 nla_nest_end(skb, nest);
4547 EXPORT_SYMBOL_GPL(nft_data_dump);
4549 static int nf_tables_init_net(struct net *net)
4551 INIT_LIST_HEAD(&net->nft.af_info);
4552 INIT_LIST_HEAD(&net->nft.commit_list);
4553 net->nft.base_seq = 1;
4557 static struct pernet_operations nf_tables_net_ops = {
4558 .init = nf_tables_init_net,
4561 static int __init nf_tables_module_init(void)
4565 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4572 err = nf_tables_core_module_init();
4576 err = nfnetlink_subsys_register(&nf_tables_subsys);
4580 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4581 return register_pernet_subsys(&nf_tables_net_ops);
4583 nf_tables_core_module_exit();
4590 static void __exit nf_tables_module_exit(void)
4592 unregister_pernet_subsys(&nf_tables_net_ops);
4593 nfnetlink_subsys_unregister(&nf_tables_subsys);
4595 nf_tables_core_module_exit();
4599 module_init(nf_tables_module_init);
4600 module_exit(nf_tables_module_exit);
4602 MODULE_LICENSE("GPL");
4603 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4604 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);