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);
44 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
47 * nft_unregister_afinfo - unregister nf_tables address family info
49 * @afi: address family info to unregister
51 * Unregister the address family for use with nf_tables.
53 void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
55 nfnl_lock(NFNL_SUBSYS_NFTABLES);
56 __nft_release_afinfo(net, afi);
57 list_del_rcu(&afi->list);
58 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
60 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
62 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
64 struct nft_af_info *afi;
66 list_for_each_entry(afi, &net->nft.af_info, list) {
67 if (afi->family == family)
73 static struct nft_af_info *
74 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
76 struct nft_af_info *afi;
78 afi = nft_afinfo_lookup(net, family);
83 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
84 request_module("nft-afinfo-%u", family);
85 nfnl_lock(NFNL_SUBSYS_NFTABLES);
86 afi = nft_afinfo_lookup(net, family);
88 return ERR_PTR(-EAGAIN);
91 return ERR_PTR(-EAFNOSUPPORT);
94 static void nft_ctx_init(struct nft_ctx *ctx,
96 const struct sk_buff *skb,
97 const struct nlmsghdr *nlh,
98 struct nft_af_info *afi,
99 struct nft_table *table,
100 struct nft_chain *chain,
101 const struct nlattr * const *nla)
108 ctx->portid = NETLINK_CB(skb).portid;
109 ctx->report = nlmsg_report(nlh);
110 ctx->seq = nlh->nlmsg_seq;
113 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
116 struct nft_trans *trans;
118 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
122 trans->msg_type = msg_type;
128 static void nft_trans_destroy(struct nft_trans *trans)
130 list_del(&trans->list);
134 static int nf_tables_register_hooks(struct net *net,
135 const struct nft_table *table,
136 struct nft_chain *chain,
137 unsigned int hook_nops)
139 if (table->flags & NFT_TABLE_F_DORMANT ||
140 !(chain->flags & NFT_BASE_CHAIN))
143 return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
147 static void nf_tables_unregister_hooks(struct net *net,
148 const struct nft_table *table,
149 struct nft_chain *chain,
150 unsigned int hook_nops)
152 if (table->flags & NFT_TABLE_F_DORMANT ||
153 !(chain->flags & NFT_BASE_CHAIN))
156 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
159 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
161 struct nft_trans *trans;
163 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
167 if (msg_type == NFT_MSG_NEWTABLE)
168 nft_activate_next(ctx->net, ctx->table);
170 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
174 static int nft_deltable(struct nft_ctx *ctx)
178 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
182 nft_deactivate_next(ctx->net, ctx->table);
186 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
188 struct nft_trans *trans;
190 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
194 if (msg_type == NFT_MSG_NEWCHAIN)
195 nft_activate_next(ctx->net, ctx->chain);
197 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
201 static int nft_delchain(struct nft_ctx *ctx)
205 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
210 nft_deactivate_next(ctx->net, ctx->chain);
216 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
218 /* You cannot delete the same rule twice */
219 if (nft_is_active_next(ctx->net, rule)) {
220 nft_deactivate_next(ctx->net, rule);
227 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
228 struct nft_rule *rule)
230 struct nft_trans *trans;
232 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
236 nft_trans_rule(trans) = rule;
237 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
242 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
244 struct nft_trans *trans;
247 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
251 err = nf_tables_delrule_deactivate(ctx, rule);
253 nft_trans_destroy(trans);
260 static int nft_delrule_by_chain(struct nft_ctx *ctx)
262 struct nft_rule *rule;
265 list_for_each_entry(rule, &ctx->chain->rules, list) {
266 err = nft_delrule(ctx, rule);
273 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
276 struct nft_trans *trans;
278 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
282 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
283 nft_trans_set_id(trans) =
284 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
285 nft_activate_next(ctx->net, set);
287 nft_trans_set(trans) = set;
288 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
293 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
297 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
301 nft_deactivate_next(ctx->net, set);
311 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
312 const struct nlattr *nla,
315 struct nft_table *table;
317 list_for_each_entry(table, &afi->tables, list) {
318 if (!nla_strcmp(nla, table->name) &&
319 nft_active_genmask(table, genmask))
325 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
326 const struct nlattr *nla,
329 struct nft_table *table;
332 return ERR_PTR(-EINVAL);
334 table = nft_table_lookup(afi, nla, genmask);
338 return ERR_PTR(-ENOENT);
341 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
343 return ++table->hgenerator;
346 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
348 static const struct nf_chain_type *
349 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
353 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
354 if (chain_type[family][i] != NULL &&
355 !nla_strcmp(nla, chain_type[family][i]->name))
356 return chain_type[family][i];
361 static const struct nf_chain_type *
362 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
363 const struct nlattr *nla,
366 const struct nf_chain_type *type;
368 type = __nf_tables_chain_type_lookup(afi->family, nla);
371 #ifdef CONFIG_MODULES
373 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
374 request_module("nft-chain-%u-%.*s", afi->family,
375 nla_len(nla), (const char *)nla_data(nla));
376 nfnl_lock(NFNL_SUBSYS_NFTABLES);
377 type = __nf_tables_chain_type_lookup(afi->family, nla);
379 return ERR_PTR(-EAGAIN);
382 return ERR_PTR(-ENOENT);
385 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
386 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
387 .len = NFT_TABLE_MAXNAMELEN - 1 },
388 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
391 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
392 u32 portid, u32 seq, int event, u32 flags,
393 int family, const struct nft_table *table)
395 struct nlmsghdr *nlh;
396 struct nfgenmsg *nfmsg;
398 event |= NFNL_SUBSYS_NFTABLES << 8;
399 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
401 goto nla_put_failure;
403 nfmsg = nlmsg_data(nlh);
404 nfmsg->nfgen_family = family;
405 nfmsg->version = NFNETLINK_V0;
406 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
408 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
409 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
410 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
411 goto nla_put_failure;
417 nlmsg_trim(skb, nlh);
421 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
427 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
431 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
435 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
436 event, 0, ctx->afi->family, ctx->table);
442 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
443 ctx->report, GFP_KERNEL);
446 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
452 static int nf_tables_dump_tables(struct sk_buff *skb,
453 struct netlink_callback *cb)
455 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
456 const struct nft_af_info *afi;
457 const struct nft_table *table;
458 unsigned int idx = 0, s_idx = cb->args[0];
459 struct net *net = sock_net(skb->sk);
460 int family = nfmsg->nfgen_family;
463 cb->seq = net->nft.base_seq;
465 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
466 if (family != NFPROTO_UNSPEC && family != afi->family)
469 list_for_each_entry_rcu(table, &afi->tables, list) {
473 memset(&cb->args[1], 0,
474 sizeof(cb->args) - sizeof(cb->args[0]));
475 if (!nft_is_active(net, table))
477 if (nf_tables_fill_table_info(skb, net,
478 NETLINK_CB(cb->skb).portid,
482 afi->family, table) < 0)
485 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
496 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
497 struct sk_buff *skb, const struct nlmsghdr *nlh,
498 const struct nlattr * const nla[])
500 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
501 u8 genmask = nft_genmask_cur(net);
502 const struct nft_af_info *afi;
503 const struct nft_table *table;
504 struct sk_buff *skb2;
505 int family = nfmsg->nfgen_family;
508 if (nlh->nlmsg_flags & NLM_F_DUMP) {
509 struct netlink_dump_control c = {
510 .dump = nf_tables_dump_tables,
512 return netlink_dump_start(nlsk, skb, nlh, &c);
515 afi = nf_tables_afinfo_lookup(net, family, false);
519 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
521 return PTR_ERR(table);
523 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
527 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
528 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
533 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
540 static int nf_tables_table_enable(struct net *net,
541 const struct nft_af_info *afi,
542 struct nft_table *table)
544 struct nft_chain *chain;
547 list_for_each_entry(chain, &table->chains, list) {
548 if (!nft_is_active_next(net, chain))
550 if (!(chain->flags & NFT_BASE_CHAIN))
553 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
562 list_for_each_entry(chain, &table->chains, list) {
563 if (!nft_is_active_next(net, chain))
565 if (!(chain->flags & NFT_BASE_CHAIN))
571 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
577 static void nf_tables_table_disable(struct net *net,
578 const struct nft_af_info *afi,
579 struct nft_table *table)
581 struct nft_chain *chain;
583 list_for_each_entry(chain, &table->chains, list) {
584 if (!nft_is_active_next(net, chain))
586 if (!(chain->flags & NFT_BASE_CHAIN))
589 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
594 static int nf_tables_updtable(struct nft_ctx *ctx)
596 struct nft_trans *trans;
600 if (!ctx->nla[NFTA_TABLE_FLAGS])
603 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
604 if (flags & ~NFT_TABLE_F_DORMANT)
607 if (flags == ctx->table->flags)
610 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
611 sizeof(struct nft_trans_table));
615 if ((flags & NFT_TABLE_F_DORMANT) &&
616 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
617 nft_trans_table_enable(trans) = false;
618 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
619 ctx->table->flags & NFT_TABLE_F_DORMANT) {
620 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
622 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
623 nft_trans_table_enable(trans) = true;
629 nft_trans_table_update(trans) = true;
630 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
633 nft_trans_destroy(trans);
637 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
638 struct sk_buff *skb, const struct nlmsghdr *nlh,
639 const struct nlattr * const nla[])
641 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
642 u8 genmask = nft_genmask_next(net);
643 const struct nlattr *name;
644 struct nft_af_info *afi;
645 struct nft_table *table;
646 int family = nfmsg->nfgen_family;
651 afi = nf_tables_afinfo_lookup(net, family, true);
655 name = nla[NFTA_TABLE_NAME];
656 table = nf_tables_table_lookup(afi, name, genmask);
658 if (PTR_ERR(table) != -ENOENT)
659 return PTR_ERR(table);
664 if (nlh->nlmsg_flags & NLM_F_EXCL)
666 if (nlh->nlmsg_flags & NLM_F_REPLACE)
669 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
670 return nf_tables_updtable(&ctx);
673 if (nla[NFTA_TABLE_FLAGS]) {
674 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
675 if (flags & ~NFT_TABLE_F_DORMANT)
680 if (!try_module_get(afi->owner))
684 table = kzalloc(sizeof(*table), GFP_KERNEL);
688 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
689 INIT_LIST_HEAD(&table->chains);
690 INIT_LIST_HEAD(&table->sets);
691 table->flags = flags;
693 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
694 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
698 list_add_tail_rcu(&table->list, &afi->tables);
703 module_put(afi->owner);
708 static int nft_flush_table(struct nft_ctx *ctx)
711 struct nft_chain *chain, *nc;
712 struct nft_set *set, *ns;
714 list_for_each_entry(chain, &ctx->table->chains, list) {
715 if (!nft_is_active_next(ctx->net, chain))
720 err = nft_delrule_by_chain(ctx);
725 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
726 if (!nft_is_active_next(ctx->net, set))
729 if (set->flags & NFT_SET_ANONYMOUS &&
730 !list_empty(&set->bindings))
733 err = nft_delset(ctx, set);
738 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
739 if (!nft_is_active_next(ctx->net, chain))
744 err = nft_delchain(ctx);
749 err = nft_deltable(ctx);
754 static int nft_flush(struct nft_ctx *ctx, int family)
756 struct nft_af_info *afi;
757 struct nft_table *table, *nt;
758 const struct nlattr * const *nla = ctx->nla;
761 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
762 if (family != AF_UNSPEC && afi->family != family)
766 list_for_each_entry_safe(table, nt, &afi->tables, list) {
767 if (!nft_is_active_next(ctx->net, table))
770 if (nla[NFTA_TABLE_NAME] &&
771 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
776 err = nft_flush_table(ctx);
785 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
786 struct sk_buff *skb, const struct nlmsghdr *nlh,
787 const struct nlattr * const nla[])
789 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
790 u8 genmask = nft_genmask_next(net);
791 struct nft_af_info *afi;
792 struct nft_table *table;
793 int family = nfmsg->nfgen_family;
796 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
797 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
798 return nft_flush(&ctx, family);
800 afi = nf_tables_afinfo_lookup(net, family, false);
804 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
806 return PTR_ERR(table);
811 return nft_flush_table(&ctx);
814 static void nf_tables_table_destroy(struct nft_ctx *ctx)
816 BUG_ON(ctx->table->use > 0);
819 module_put(ctx->afi->owner);
822 int nft_register_chain_type(const struct nf_chain_type *ctype)
826 nfnl_lock(NFNL_SUBSYS_NFTABLES);
827 if (chain_type[ctype->family][ctype->type] != NULL) {
831 chain_type[ctype->family][ctype->type] = ctype;
833 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
836 EXPORT_SYMBOL_GPL(nft_register_chain_type);
838 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
840 nfnl_lock(NFNL_SUBSYS_NFTABLES);
841 chain_type[ctype->family][ctype->type] = NULL;
842 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
844 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
850 static struct nft_chain *
851 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
854 struct nft_chain *chain;
856 list_for_each_entry(chain, &table->chains, list) {
857 if (chain->handle == handle &&
858 nft_active_genmask(chain, genmask))
862 return ERR_PTR(-ENOENT);
865 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
866 const struct nlattr *nla,
869 struct nft_chain *chain;
872 return ERR_PTR(-EINVAL);
874 list_for_each_entry(chain, &table->chains, list) {
875 if (!nla_strcmp(nla, chain->name) &&
876 nft_active_genmask(chain, genmask))
880 return ERR_PTR(-ENOENT);
883 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
884 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
885 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
886 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
887 .len = NFT_CHAIN_MAXNAMELEN - 1 },
888 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
889 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
890 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
891 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
894 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
895 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
896 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
897 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
898 .len = IFNAMSIZ - 1 },
901 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
903 struct nft_stats *cpu_stats, total;
909 memset(&total, 0, sizeof(total));
910 for_each_possible_cpu(cpu) {
911 cpu_stats = per_cpu_ptr(stats, cpu);
913 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
914 pkts = cpu_stats->pkts;
915 bytes = cpu_stats->bytes;
916 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
918 total.bytes += bytes;
920 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
922 goto nla_put_failure;
924 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
926 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
928 goto nla_put_failure;
930 nla_nest_end(skb, nest);
937 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
938 u32 portid, u32 seq, int event, u32 flags,
939 int family, const struct nft_table *table,
940 const struct nft_chain *chain)
942 struct nlmsghdr *nlh;
943 struct nfgenmsg *nfmsg;
945 event |= NFNL_SUBSYS_NFTABLES << 8;
946 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
948 goto nla_put_failure;
950 nfmsg = nlmsg_data(nlh);
951 nfmsg->nfgen_family = family;
952 nfmsg->version = NFNETLINK_V0;
953 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
955 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
956 goto nla_put_failure;
957 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
959 goto nla_put_failure;
960 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
961 goto nla_put_failure;
963 if (chain->flags & NFT_BASE_CHAIN) {
964 const struct nft_base_chain *basechain = nft_base_chain(chain);
965 const struct nf_hook_ops *ops = &basechain->ops[0];
968 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
970 goto nla_put_failure;
971 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
972 goto nla_put_failure;
973 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
974 goto nla_put_failure;
975 if (basechain->dev_name[0] &&
976 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
977 goto nla_put_failure;
978 nla_nest_end(skb, nest);
980 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
981 htonl(basechain->policy)))
982 goto nla_put_failure;
984 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
985 goto nla_put_failure;
987 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
988 goto nla_put_failure;
991 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
992 goto nla_put_failure;
998 nlmsg_trim(skb, nlh);
1002 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1004 struct sk_buff *skb;
1008 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1012 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1016 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1017 event, 0, ctx->afi->family, ctx->table,
1024 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1025 ctx->report, GFP_KERNEL);
1028 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1034 static int nf_tables_dump_chains(struct sk_buff *skb,
1035 struct netlink_callback *cb)
1037 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1038 const struct nft_af_info *afi;
1039 const struct nft_table *table;
1040 const struct nft_chain *chain;
1041 unsigned int idx = 0, s_idx = cb->args[0];
1042 struct net *net = sock_net(skb->sk);
1043 int family = nfmsg->nfgen_family;
1046 cb->seq = net->nft.base_seq;
1048 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1049 if (family != NFPROTO_UNSPEC && family != afi->family)
1052 list_for_each_entry_rcu(table, &afi->tables, list) {
1053 list_for_each_entry_rcu(chain, &table->chains, list) {
1057 memset(&cb->args[1], 0,
1058 sizeof(cb->args) - sizeof(cb->args[0]));
1059 if (!nft_is_active(net, chain))
1061 if (nf_tables_fill_chain_info(skb, net,
1062 NETLINK_CB(cb->skb).portid,
1066 afi->family, table, chain) < 0)
1069 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1081 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1082 struct sk_buff *skb, const struct nlmsghdr *nlh,
1083 const struct nlattr * const nla[])
1085 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1086 u8 genmask = nft_genmask_cur(net);
1087 const struct nft_af_info *afi;
1088 const struct nft_table *table;
1089 const struct nft_chain *chain;
1090 struct sk_buff *skb2;
1091 int family = nfmsg->nfgen_family;
1094 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1095 struct netlink_dump_control c = {
1096 .dump = nf_tables_dump_chains,
1098 return netlink_dump_start(nlsk, skb, nlh, &c);
1101 afi = nf_tables_afinfo_lookup(net, family, false);
1103 return PTR_ERR(afi);
1105 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1107 return PTR_ERR(table);
1109 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1111 return PTR_ERR(chain);
1113 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1117 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1118 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1119 family, table, chain);
1123 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1130 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1131 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1132 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1135 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1137 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1138 struct nft_stats __percpu *newstats;
1139 struct nft_stats *stats;
1142 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1144 return ERR_PTR(err);
1146 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1147 return ERR_PTR(-EINVAL);
1149 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1150 if (newstats == NULL)
1151 return ERR_PTR(-ENOMEM);
1153 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1154 * are not exposed to userspace.
1157 stats = this_cpu_ptr(newstats);
1158 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1159 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1165 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1166 struct nft_stats __percpu *newstats)
1168 if (newstats == NULL)
1172 struct nft_stats __percpu *oldstats =
1173 nft_dereference(chain->stats);
1175 rcu_assign_pointer(chain->stats, newstats);
1177 free_percpu(oldstats);
1179 rcu_assign_pointer(chain->stats, newstats);
1182 static void nf_tables_chain_destroy(struct nft_chain *chain)
1184 BUG_ON(chain->use > 0);
1186 if (chain->flags & NFT_BASE_CHAIN) {
1187 struct nft_base_chain *basechain = nft_base_chain(chain);
1189 module_put(basechain->type->owner);
1190 free_percpu(basechain->stats);
1191 if (basechain->ops[0].dev != NULL)
1192 dev_put(basechain->ops[0].dev);
1199 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1200 struct sk_buff *skb, const struct nlmsghdr *nlh,
1201 const struct nlattr * const nla[])
1203 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1204 const struct nlattr * uninitialized_var(name);
1205 struct nft_af_info *afi;
1206 struct nft_table *table;
1207 struct nft_chain *chain;
1208 struct nft_base_chain *basechain = NULL;
1209 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1210 u8 genmask = nft_genmask_next(net);
1211 int family = nfmsg->nfgen_family;
1212 struct net_device *dev = NULL;
1213 u8 policy = NF_ACCEPT;
1216 struct nft_stats __percpu *stats;
1221 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1223 afi = nf_tables_afinfo_lookup(net, family, true);
1225 return PTR_ERR(afi);
1227 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1229 return PTR_ERR(table);
1232 name = nla[NFTA_CHAIN_NAME];
1234 if (nla[NFTA_CHAIN_HANDLE]) {
1235 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1236 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1238 return PTR_ERR(chain);
1240 chain = nf_tables_chain_lookup(table, name, genmask);
1241 if (IS_ERR(chain)) {
1242 if (PTR_ERR(chain) != -ENOENT)
1243 return PTR_ERR(chain);
1248 if (nla[NFTA_CHAIN_POLICY]) {
1249 if ((chain != NULL &&
1250 !(chain->flags & NFT_BASE_CHAIN)))
1253 if (chain == NULL &&
1254 nla[NFTA_CHAIN_HOOK] == NULL)
1257 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1267 if (chain != NULL) {
1268 struct nft_stats *stats = NULL;
1269 struct nft_trans *trans;
1271 if (nlh->nlmsg_flags & NLM_F_EXCL)
1273 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1276 if (nla[NFTA_CHAIN_HANDLE] && name) {
1277 struct nft_chain *chain2;
1279 chain2 = nf_tables_chain_lookup(table,
1280 nla[NFTA_CHAIN_NAME],
1283 return PTR_ERR(chain2);
1286 if (nla[NFTA_CHAIN_COUNTERS]) {
1287 if (!(chain->flags & NFT_BASE_CHAIN))
1290 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1292 return PTR_ERR(stats);
1295 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1296 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1297 sizeof(struct nft_trans_chain));
1298 if (trans == NULL) {
1303 nft_trans_chain_stats(trans) = stats;
1304 nft_trans_chain_update(trans) = true;
1306 if (nla[NFTA_CHAIN_POLICY])
1307 nft_trans_chain_policy(trans) = policy;
1309 nft_trans_chain_policy(trans) = -1;
1311 if (nla[NFTA_CHAIN_HANDLE] && name) {
1312 nla_strlcpy(nft_trans_chain_name(trans), name,
1313 NFT_CHAIN_MAXNAMELEN);
1315 list_add_tail(&trans->list, &net->nft.commit_list);
1319 if (table->use == UINT_MAX)
1322 if (nla[NFTA_CHAIN_HOOK]) {
1323 const struct nf_chain_type *type;
1324 struct nf_hook_ops *ops;
1326 u32 hooknum, priority;
1328 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1329 if (nla[NFTA_CHAIN_TYPE]) {
1330 type = nf_tables_chain_type_lookup(afi,
1331 nla[NFTA_CHAIN_TYPE],
1334 return PTR_ERR(type);
1337 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1341 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1342 ha[NFTA_HOOK_PRIORITY] == NULL)
1345 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1346 if (hooknum >= afi->nhooks)
1348 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1350 if (!(type->hook_mask & (1 << hooknum)))
1352 if (!try_module_get(type->owner))
1354 hookfn = type->hooks[hooknum];
1356 if (afi->flags & NFT_AF_NEEDS_DEV) {
1357 char ifname[IFNAMSIZ];
1359 if (!ha[NFTA_HOOK_DEV]) {
1360 module_put(type->owner);
1364 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1365 dev = dev_get_by_name(net, ifname);
1367 module_put(type->owner);
1370 } else if (ha[NFTA_HOOK_DEV]) {
1371 module_put(type->owner);
1375 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1376 if (basechain == NULL) {
1377 module_put(type->owner);
1384 strncpy(basechain->dev_name, dev->name, IFNAMSIZ);
1386 if (nla[NFTA_CHAIN_COUNTERS]) {
1387 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1388 if (IS_ERR(stats)) {
1389 module_put(type->owner);
1393 return PTR_ERR(stats);
1395 basechain->stats = stats;
1397 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1398 if (stats == NULL) {
1399 module_put(type->owner);
1405 rcu_assign_pointer(basechain->stats, stats);
1408 write_pnet(&basechain->pnet, net);
1409 basechain->type = type;
1410 chain = &basechain->chain;
1412 for (i = 0; i < afi->nops; i++) {
1413 ops = &basechain->ops[i];
1415 ops->hooknum = hooknum;
1416 ops->priority = priority;
1418 ops->hook = afi->hooks[ops->hooknum];
1422 if (afi->hook_ops_init)
1423 afi->hook_ops_init(ops, i);
1426 chain->flags |= NFT_BASE_CHAIN;
1427 basechain->policy = policy;
1429 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1434 INIT_LIST_HEAD(&chain->rules);
1435 chain->handle = nf_tables_alloc_handle(table);
1436 chain->table = table;
1437 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1439 err = nf_tables_register_hooks(net, table, chain, afi->nops);
1443 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1444 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1449 list_add_tail_rcu(&chain->list, &table->chains);
1452 nf_tables_unregister_hooks(net, table, chain, afi->nops);
1454 nf_tables_chain_destroy(chain);
1458 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1459 struct sk_buff *skb, const struct nlmsghdr *nlh,
1460 const struct nlattr * const nla[])
1462 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1463 u8 genmask = nft_genmask_next(net);
1464 struct nft_af_info *afi;
1465 struct nft_table *table;
1466 struct nft_chain *chain;
1467 int family = nfmsg->nfgen_family;
1470 afi = nf_tables_afinfo_lookup(net, family, false);
1472 return PTR_ERR(afi);
1474 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1476 return PTR_ERR(table);
1478 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1480 return PTR_ERR(chain);
1484 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1486 return nft_delchain(&ctx);
1494 * nft_register_expr - register nf_tables expr type
1497 * Registers the expr type for use with nf_tables. Returns zero on
1498 * success or a negative errno code otherwise.
1500 int nft_register_expr(struct nft_expr_type *type)
1502 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1503 if (type->family == NFPROTO_UNSPEC)
1504 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1506 list_add_rcu(&type->list, &nf_tables_expressions);
1507 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1510 EXPORT_SYMBOL_GPL(nft_register_expr);
1513 * nft_unregister_expr - unregister nf_tables expr type
1516 * Unregisters the expr typefor use with nf_tables.
1518 void nft_unregister_expr(struct nft_expr_type *type)
1520 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1521 list_del_rcu(&type->list);
1522 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1524 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1526 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1529 const struct nft_expr_type *type;
1531 list_for_each_entry(type, &nf_tables_expressions, list) {
1532 if (!nla_strcmp(nla, type->name) &&
1533 (!type->family || type->family == family))
1539 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1542 const struct nft_expr_type *type;
1545 return ERR_PTR(-EINVAL);
1547 type = __nft_expr_type_get(family, nla);
1548 if (type != NULL && try_module_get(type->owner))
1551 #ifdef CONFIG_MODULES
1553 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1554 request_module("nft-expr-%u-%.*s", family,
1555 nla_len(nla), (char *)nla_data(nla));
1556 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1557 if (__nft_expr_type_get(family, nla))
1558 return ERR_PTR(-EAGAIN);
1560 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1561 request_module("nft-expr-%.*s",
1562 nla_len(nla), (char *)nla_data(nla));
1563 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1564 if (__nft_expr_type_get(family, nla))
1565 return ERR_PTR(-EAGAIN);
1568 return ERR_PTR(-ENOENT);
1571 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1572 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1573 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1576 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1577 const struct nft_expr *expr)
1579 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1580 goto nla_put_failure;
1582 if (expr->ops->dump) {
1583 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1585 goto nla_put_failure;
1586 if (expr->ops->dump(skb, expr) < 0)
1587 goto nla_put_failure;
1588 nla_nest_end(skb, data);
1597 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1598 const struct nft_expr *expr)
1600 struct nlattr *nest;
1602 nest = nla_nest_start(skb, attr);
1604 goto nla_put_failure;
1605 if (nf_tables_fill_expr_info(skb, expr) < 0)
1606 goto nla_put_failure;
1607 nla_nest_end(skb, nest);
1614 struct nft_expr_info {
1615 const struct nft_expr_ops *ops;
1616 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1619 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1620 const struct nlattr *nla,
1621 struct nft_expr_info *info)
1623 const struct nft_expr_type *type;
1624 const struct nft_expr_ops *ops;
1625 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1628 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1632 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1634 return PTR_ERR(type);
1636 if (tb[NFTA_EXPR_DATA]) {
1637 err = nla_parse_nested(info->tb, type->maxattr,
1638 tb[NFTA_EXPR_DATA], type->policy);
1642 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1644 if (type->select_ops != NULL) {
1645 ops = type->select_ops(ctx,
1646 (const struct nlattr * const *)info->tb);
1658 module_put(type->owner);
1662 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1663 const struct nft_expr_info *info,
1664 struct nft_expr *expr)
1666 const struct nft_expr_ops *ops = info->ops;
1671 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1683 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1684 struct nft_expr *expr)
1686 if (expr->ops->destroy)
1687 expr->ops->destroy(ctx, expr);
1688 module_put(expr->ops->type->owner);
1691 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1692 const struct nlattr *nla)
1694 struct nft_expr_info info;
1695 struct nft_expr *expr;
1698 err = nf_tables_expr_parse(ctx, nla, &info);
1703 expr = kzalloc(info.ops->size, GFP_KERNEL);
1707 err = nf_tables_newexpr(ctx, &info, expr);
1715 module_put(info.ops->type->owner);
1717 return ERR_PTR(err);
1720 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1722 nf_tables_expr_destroy(ctx, expr);
1730 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1733 struct nft_rule *rule;
1735 // FIXME: this sucks
1736 list_for_each_entry(rule, &chain->rules, list) {
1737 if (handle == rule->handle)
1741 return ERR_PTR(-ENOENT);
1744 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1745 const struct nlattr *nla)
1748 return ERR_PTR(-EINVAL);
1750 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1753 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1754 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1755 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1756 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1757 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1758 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1759 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1760 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1761 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1762 .len = NFT_USERDATA_MAXLEN },
1765 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1766 u32 portid, u32 seq, int event,
1767 u32 flags, int family,
1768 const struct nft_table *table,
1769 const struct nft_chain *chain,
1770 const struct nft_rule *rule)
1772 struct nlmsghdr *nlh;
1773 struct nfgenmsg *nfmsg;
1774 const struct nft_expr *expr, *next;
1775 struct nlattr *list;
1776 const struct nft_rule *prule;
1777 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1779 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1782 goto nla_put_failure;
1784 nfmsg = nlmsg_data(nlh);
1785 nfmsg->nfgen_family = family;
1786 nfmsg->version = NFNETLINK_V0;
1787 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1789 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1790 goto nla_put_failure;
1791 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1792 goto nla_put_failure;
1793 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1795 goto nla_put_failure;
1797 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1798 prule = list_entry(rule->list.prev, struct nft_rule, list);
1799 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1800 cpu_to_be64(prule->handle),
1802 goto nla_put_failure;
1805 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1807 goto nla_put_failure;
1808 nft_rule_for_each_expr(expr, next, rule) {
1809 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1810 goto nla_put_failure;
1812 nla_nest_end(skb, list);
1815 struct nft_userdata *udata = nft_userdata(rule);
1816 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1818 goto nla_put_failure;
1821 nlmsg_end(skb, nlh);
1825 nlmsg_trim(skb, nlh);
1829 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1830 const struct nft_rule *rule,
1833 struct sk_buff *skb;
1837 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1841 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1845 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1846 event, 0, ctx->afi->family, ctx->table,
1853 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1854 ctx->report, GFP_KERNEL);
1857 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1863 static int nf_tables_dump_rules(struct sk_buff *skb,
1864 struct netlink_callback *cb)
1866 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1867 const struct nft_af_info *afi;
1868 const struct nft_table *table;
1869 const struct nft_chain *chain;
1870 const struct nft_rule *rule;
1871 unsigned int idx = 0, s_idx = cb->args[0];
1872 struct net *net = sock_net(skb->sk);
1873 int family = nfmsg->nfgen_family;
1876 cb->seq = net->nft.base_seq;
1878 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1879 if (family != NFPROTO_UNSPEC && family != afi->family)
1882 list_for_each_entry_rcu(table, &afi->tables, list) {
1883 list_for_each_entry_rcu(chain, &table->chains, list) {
1884 list_for_each_entry_rcu(rule, &chain->rules, list) {
1885 if (!nft_is_active(net, rule))
1890 memset(&cb->args[1], 0,
1891 sizeof(cb->args) - sizeof(cb->args[0]));
1892 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
1895 NLM_F_MULTI | NLM_F_APPEND,
1896 afi->family, table, chain, rule) < 0)
1899 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1913 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
1914 struct sk_buff *skb, const struct nlmsghdr *nlh,
1915 const struct nlattr * const nla[])
1917 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1918 u8 genmask = nft_genmask_cur(net);
1919 const struct nft_af_info *afi;
1920 const struct nft_table *table;
1921 const struct nft_chain *chain;
1922 const struct nft_rule *rule;
1923 struct sk_buff *skb2;
1924 int family = nfmsg->nfgen_family;
1927 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1928 struct netlink_dump_control c = {
1929 .dump = nf_tables_dump_rules,
1931 return netlink_dump_start(nlsk, skb, nlh, &c);
1934 afi = nf_tables_afinfo_lookup(net, family, false);
1936 return PTR_ERR(afi);
1938 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
1940 return PTR_ERR(table);
1942 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
1944 return PTR_ERR(chain);
1946 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1948 return PTR_ERR(rule);
1950 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1954 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
1955 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1956 family, table, chain, rule);
1960 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1967 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1968 struct nft_rule *rule)
1970 struct nft_expr *expr;
1973 * Careful: some expressions might not be initialized in case this
1974 * is called on error from nf_tables_newrule().
1976 expr = nft_expr_first(rule);
1977 while (expr->ops && expr != nft_expr_last(rule)) {
1978 nf_tables_expr_destroy(ctx, expr);
1979 expr = nft_expr_next(expr);
1984 #define NFT_RULE_MAXEXPRS 128
1986 static struct nft_expr_info *info;
1988 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
1989 struct sk_buff *skb, const struct nlmsghdr *nlh,
1990 const struct nlattr * const nla[])
1992 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1993 u8 genmask = nft_genmask_next(net);
1994 struct nft_af_info *afi;
1995 struct nft_table *table;
1996 struct nft_chain *chain;
1997 struct nft_rule *rule, *old_rule = NULL;
1998 struct nft_userdata *udata;
1999 struct nft_trans *trans = NULL;
2000 struct nft_expr *expr;
2003 unsigned int size, i, n, ulen = 0, usize = 0;
2006 u64 handle, pos_handle;
2008 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2010 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2012 return PTR_ERR(afi);
2014 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2016 return PTR_ERR(table);
2018 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2020 return PTR_ERR(chain);
2022 if (nla[NFTA_RULE_HANDLE]) {
2023 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2024 rule = __nf_tables_rule_lookup(chain, handle);
2026 return PTR_ERR(rule);
2028 if (nlh->nlmsg_flags & NLM_F_EXCL)
2030 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2035 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2037 handle = nf_tables_alloc_handle(table);
2039 if (chain->use == UINT_MAX)
2043 if (nla[NFTA_RULE_POSITION]) {
2044 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2047 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2048 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2049 if (IS_ERR(old_rule))
2050 return PTR_ERR(old_rule);
2053 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2057 if (nla[NFTA_RULE_EXPRESSIONS]) {
2058 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2060 if (nla_type(tmp) != NFTA_LIST_ELEM)
2062 if (n == NFT_RULE_MAXEXPRS)
2064 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2067 size += info[n].ops->size;
2071 /* Check for overflow of dlen field */
2073 if (size >= 1 << 12)
2076 if (nla[NFTA_RULE_USERDATA]) {
2077 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2079 usize = sizeof(struct nft_userdata) + ulen;
2083 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2087 nft_activate_next(net, rule);
2089 rule->handle = handle;
2091 rule->udata = ulen ? 1 : 0;
2094 udata = nft_userdata(rule);
2095 udata->len = ulen - 1;
2096 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2099 expr = nft_expr_first(rule);
2100 for (i = 0; i < n; i++) {
2101 err = nf_tables_newexpr(&ctx, &info[i], expr);
2105 expr = nft_expr_next(expr);
2108 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2109 if (nft_is_active_next(net, old_rule)) {
2110 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2112 if (trans == NULL) {
2116 nft_deactivate_next(net, old_rule);
2118 list_add_tail_rcu(&rule->list, &old_rule->list);
2123 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2125 list_add_rcu(&rule->list, &old_rule->list);
2127 list_add_tail_rcu(&rule->list, &chain->rules);
2130 list_add_tail_rcu(&rule->list, &old_rule->list);
2132 list_add_rcu(&rule->list, &chain->rules);
2135 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2143 list_del_rcu(&rule->list);
2145 nf_tables_rule_destroy(&ctx, rule);
2147 for (i = 0; i < n; i++) {
2148 if (info[i].ops != NULL)
2149 module_put(info[i].ops->type->owner);
2154 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2155 struct sk_buff *skb, const struct nlmsghdr *nlh,
2156 const struct nlattr * const nla[])
2158 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2159 u8 genmask = nft_genmask_next(net);
2160 struct nft_af_info *afi;
2161 struct nft_table *table;
2162 struct nft_chain *chain = NULL;
2163 struct nft_rule *rule;
2164 int family = nfmsg->nfgen_family, err = 0;
2167 afi = nf_tables_afinfo_lookup(net, family, false);
2169 return PTR_ERR(afi);
2171 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2173 return PTR_ERR(table);
2175 if (nla[NFTA_RULE_CHAIN]) {
2176 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2179 return PTR_ERR(chain);
2182 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2185 if (nla[NFTA_RULE_HANDLE]) {
2186 rule = nf_tables_rule_lookup(chain,
2187 nla[NFTA_RULE_HANDLE]);
2189 return PTR_ERR(rule);
2191 err = nft_delrule(&ctx, rule);
2193 err = nft_delrule_by_chain(&ctx);
2196 list_for_each_entry(chain, &table->chains, list) {
2197 if (!nft_is_active_next(net, chain))
2201 err = nft_delrule_by_chain(&ctx);
2214 static LIST_HEAD(nf_tables_set_ops);
2216 int nft_register_set(struct nft_set_ops *ops)
2218 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2219 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2220 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2223 EXPORT_SYMBOL_GPL(nft_register_set);
2225 void nft_unregister_set(struct nft_set_ops *ops)
2227 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2228 list_del_rcu(&ops->list);
2229 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2231 EXPORT_SYMBOL_GPL(nft_unregister_set);
2234 * Select a set implementation based on the data characteristics and the
2235 * given policy. The total memory use might not be known if no size is
2236 * given, in that case the amount of memory per element is used.
2238 static const struct nft_set_ops *
2239 nft_select_set_ops(const struct nlattr * const nla[],
2240 const struct nft_set_desc *desc,
2241 enum nft_set_policies policy)
2243 const struct nft_set_ops *ops, *bops;
2244 struct nft_set_estimate est, best;
2247 #ifdef CONFIG_MODULES
2248 if (list_empty(&nf_tables_set_ops)) {
2249 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2250 request_module("nft-set");
2251 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2252 if (!list_empty(&nf_tables_set_ops))
2253 return ERR_PTR(-EAGAIN);
2257 if (nla[NFTA_SET_FLAGS] != NULL) {
2258 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2259 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2266 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2267 if ((ops->features & features) != features)
2269 if (!ops->estimate(desc, features, &est))
2273 case NFT_SET_POL_PERFORMANCE:
2274 if (est.class < best.class)
2276 if (est.class == best.class && est.size < best.size)
2279 case NFT_SET_POL_MEMORY:
2280 if (est.size < best.size)
2282 if (est.size == best.size && est.class < best.class)
2289 if (!try_module_get(ops->owner))
2292 module_put(bops->owner);
2301 return ERR_PTR(-EOPNOTSUPP);
2304 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2305 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2306 [NFTA_SET_NAME] = { .type = NLA_STRING,
2307 .len = NFT_SET_MAXNAMELEN - 1 },
2308 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2309 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2310 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2311 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2312 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2313 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2314 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2315 [NFTA_SET_ID] = { .type = NLA_U32 },
2316 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2317 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2318 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2319 .len = NFT_USERDATA_MAXLEN },
2322 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2323 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2326 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2327 const struct sk_buff *skb,
2328 const struct nlmsghdr *nlh,
2329 const struct nlattr * const nla[],
2332 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2333 struct nft_af_info *afi = NULL;
2334 struct nft_table *table = NULL;
2336 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2337 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2339 return PTR_ERR(afi);
2342 if (nla[NFTA_SET_TABLE] != NULL) {
2344 return -EAFNOSUPPORT;
2346 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2349 return PTR_ERR(table);
2352 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2356 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2357 const struct nlattr *nla, u8 genmask)
2359 struct nft_set *set;
2362 return ERR_PTR(-EINVAL);
2364 list_for_each_entry(set, &table->sets, list) {
2365 if (!nla_strcmp(nla, set->name) &&
2366 nft_active_genmask(set, genmask))
2369 return ERR_PTR(-ENOENT);
2372 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2373 const struct nlattr *nla,
2376 struct nft_trans *trans;
2377 u32 id = ntohl(nla_get_be32(nla));
2379 list_for_each_entry(trans, &net->nft.commit_list, list) {
2380 struct nft_set *set = nft_trans_set(trans);
2382 if (trans->msg_type == NFT_MSG_NEWSET &&
2383 id == nft_trans_set_id(trans) &&
2384 nft_active_genmask(set, genmask))
2387 return ERR_PTR(-ENOENT);
2390 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2393 const struct nft_set *i;
2395 unsigned long *inuse;
2396 unsigned int n = 0, min = 0;
2398 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2400 if (p[1] != 'd' || strchr(p + 2, '%'))
2403 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2407 list_for_each_entry(i, &ctx->table->sets, list) {
2410 if (!nft_is_active_next(ctx->net, set))
2412 if (!sscanf(i->name, name, &tmp))
2414 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2417 set_bit(tmp - min, inuse);
2420 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2421 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2422 min += BITS_PER_BYTE * PAGE_SIZE;
2423 memset(inuse, 0, PAGE_SIZE);
2426 free_page((unsigned long)inuse);
2429 snprintf(set->name, sizeof(set->name), name, min + n);
2430 list_for_each_entry(i, &ctx->table->sets, list) {
2431 if (!nft_is_active_next(ctx->net, i))
2433 if (!strcmp(set->name, i->name))
2439 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2440 const struct nft_set *set, u16 event, u16 flags)
2442 struct nfgenmsg *nfmsg;
2443 struct nlmsghdr *nlh;
2444 struct nlattr *desc;
2445 u32 portid = ctx->portid;
2448 event |= NFNL_SUBSYS_NFTABLES << 8;
2449 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2452 goto nla_put_failure;
2454 nfmsg = nlmsg_data(nlh);
2455 nfmsg->nfgen_family = ctx->afi->family;
2456 nfmsg->version = NFNETLINK_V0;
2457 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2459 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2460 goto nla_put_failure;
2461 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2462 goto nla_put_failure;
2463 if (set->flags != 0)
2464 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2465 goto nla_put_failure;
2467 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2468 goto nla_put_failure;
2469 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2470 goto nla_put_failure;
2471 if (set->flags & NFT_SET_MAP) {
2472 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2473 goto nla_put_failure;
2474 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2475 goto nla_put_failure;
2479 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout),
2481 goto nla_put_failure;
2483 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2484 goto nla_put_failure;
2486 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2487 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2488 goto nla_put_failure;
2491 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2492 goto nla_put_failure;
2494 desc = nla_nest_start(skb, NFTA_SET_DESC);
2496 goto nla_put_failure;
2498 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2499 goto nla_put_failure;
2500 nla_nest_end(skb, desc);
2502 nlmsg_end(skb, nlh);
2506 nlmsg_trim(skb, nlh);
2510 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2511 const struct nft_set *set,
2512 int event, gfp_t gfp_flags)
2514 struct sk_buff *skb;
2515 u32 portid = ctx->portid;
2519 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2523 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2527 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2533 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2534 ctx->report, gfp_flags);
2537 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2541 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2543 const struct nft_set *set;
2544 unsigned int idx, s_idx = cb->args[0];
2545 struct nft_af_info *afi;
2546 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2547 struct net *net = sock_net(skb->sk);
2548 int cur_family = cb->args[3];
2549 struct nft_ctx *ctx = cb->data, ctx_set;
2555 cb->seq = net->nft.base_seq;
2557 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2558 if (ctx->afi && ctx->afi != afi)
2562 if (afi->family != cur_family)
2567 list_for_each_entry_rcu(table, &afi->tables, list) {
2568 if (ctx->table && ctx->table != table)
2572 if (cur_table != table)
2578 list_for_each_entry_rcu(set, &table->sets, list) {
2581 if (!nft_is_active(net, set))
2585 ctx_set.table = table;
2587 if (nf_tables_fill_set(skb, &ctx_set, set,
2591 cb->args[2] = (unsigned long) table;
2592 cb->args[3] = afi->family;
2595 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2609 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2615 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2616 struct sk_buff *skb, const struct nlmsghdr *nlh,
2617 const struct nlattr * const nla[])
2619 u8 genmask = nft_genmask_cur(net);
2620 const struct nft_set *set;
2622 struct sk_buff *skb2;
2623 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2626 /* Verify existence before starting dump */
2627 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2631 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2632 struct netlink_dump_control c = {
2633 .dump = nf_tables_dump_sets,
2634 .done = nf_tables_dump_sets_done,
2636 struct nft_ctx *ctx_dump;
2638 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2639 if (ctx_dump == NULL)
2645 return netlink_dump_start(nlsk, skb, nlh, &c);
2648 /* Only accept unspec with dump */
2649 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2650 return -EAFNOSUPPORT;
2651 if (!nla[NFTA_SET_TABLE])
2654 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2656 return PTR_ERR(set);
2658 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2662 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2666 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2673 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2674 struct nft_set_desc *desc,
2675 const struct nlattr *nla)
2677 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2680 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2684 if (da[NFTA_SET_DESC_SIZE] != NULL)
2685 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2690 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2691 struct sk_buff *skb, const struct nlmsghdr *nlh,
2692 const struct nlattr * const nla[])
2694 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2695 u8 genmask = nft_genmask_next(net);
2696 const struct nft_set_ops *ops;
2697 struct nft_af_info *afi;
2698 struct nft_table *table;
2699 struct nft_set *set;
2701 char name[NFT_SET_MAXNAMELEN];
2705 u32 ktype, dtype, flags, policy, gc_int;
2706 struct nft_set_desc desc;
2707 unsigned char *udata;
2711 if (nla[NFTA_SET_TABLE] == NULL ||
2712 nla[NFTA_SET_NAME] == NULL ||
2713 nla[NFTA_SET_KEY_LEN] == NULL ||
2714 nla[NFTA_SET_ID] == NULL)
2717 memset(&desc, 0, sizeof(desc));
2719 ktype = NFT_DATA_VALUE;
2720 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2721 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2722 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2726 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2727 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2731 if (nla[NFTA_SET_FLAGS] != NULL) {
2732 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2733 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2734 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2735 NFT_SET_MAP | NFT_SET_EVAL))
2737 /* Only one of both operations is supported */
2738 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2739 (NFT_SET_MAP | NFT_SET_EVAL))
2744 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2745 if (!(flags & NFT_SET_MAP))
2748 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2749 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2750 dtype != NFT_DATA_VERDICT)
2753 if (dtype != NFT_DATA_VERDICT) {
2754 if (nla[NFTA_SET_DATA_LEN] == NULL)
2756 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2757 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2760 desc.dlen = sizeof(struct nft_verdict);
2761 } else if (flags & NFT_SET_MAP)
2765 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2766 if (!(flags & NFT_SET_TIMEOUT))
2768 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2771 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2772 if (!(flags & NFT_SET_TIMEOUT))
2774 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2777 policy = NFT_SET_POL_PERFORMANCE;
2778 if (nla[NFTA_SET_POLICY] != NULL)
2779 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2781 if (nla[NFTA_SET_DESC] != NULL) {
2782 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2787 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2789 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2791 return PTR_ERR(afi);
2793 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
2795 return PTR_ERR(table);
2797 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2799 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
2801 if (PTR_ERR(set) != -ENOENT)
2802 return PTR_ERR(set);
2807 if (nlh->nlmsg_flags & NLM_F_EXCL)
2809 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2814 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2817 ops = nft_select_set_ops(nla, &desc, policy);
2819 return PTR_ERR(ops);
2822 if (nla[NFTA_SET_USERDATA])
2823 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2826 if (ops->privsize != NULL)
2827 size = ops->privsize(nla);
2830 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
2834 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2835 err = nf_tables_set_alloc_name(&ctx, set, name);
2841 udata = set->data + size;
2842 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
2845 INIT_LIST_HEAD(&set->bindings);
2846 write_pnet(&set->pnet, net);
2849 set->klen = desc.klen;
2851 set->dlen = desc.dlen;
2853 set->size = desc.size;
2854 set->policy = policy;
2857 set->timeout = timeout;
2858 set->gc_int = gc_int;
2860 err = ops->init(set, &desc, nla);
2864 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2868 list_add_tail_rcu(&set->list, &table->sets);
2875 module_put(ops->owner);
2879 static void nft_set_destroy(struct nft_set *set)
2881 set->ops->destroy(set);
2882 module_put(set->ops->owner);
2886 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2888 list_del_rcu(&set->list);
2889 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2890 nft_set_destroy(set);
2893 static int nf_tables_delset(struct net *net, struct sock *nlsk,
2894 struct sk_buff *skb, const struct nlmsghdr *nlh,
2895 const struct nlattr * const nla[])
2897 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2898 u8 genmask = nft_genmask_next(net);
2899 struct nft_set *set;
2903 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2904 return -EAFNOSUPPORT;
2905 if (nla[NFTA_SET_TABLE] == NULL)
2908 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2912 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2914 return PTR_ERR(set);
2915 if (!list_empty(&set->bindings))
2918 return nft_delset(&ctx, set);
2921 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2922 const struct nft_set *set,
2923 const struct nft_set_iter *iter,
2924 const struct nft_set_elem *elem)
2926 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
2927 enum nft_registers dreg;
2929 dreg = nft_type_to_reg(set->dtype);
2930 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
2931 set->dtype == NFT_DATA_VERDICT ?
2932 NFT_DATA_VERDICT : NFT_DATA_VALUE,
2936 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2937 struct nft_set_binding *binding)
2939 struct nft_set_binding *i;
2940 struct nft_set_iter iter;
2942 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2945 if (binding->flags & NFT_SET_MAP) {
2946 /* If the set is already bound to the same chain all
2947 * jumps are already validated for that chain.
2949 list_for_each_entry(i, &set->bindings, list) {
2950 if (i->flags & NFT_SET_MAP &&
2951 i->chain == binding->chain)
2955 iter.genmask = nft_genmask_next(ctx->net);
2959 iter.fn = nf_tables_bind_check_setelem;
2961 set->ops->walk(ctx, set, &iter);
2966 binding->chain = ctx->chain;
2967 list_add_tail_rcu(&binding->list, &set->bindings);
2971 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2972 struct nft_set_binding *binding)
2974 list_del_rcu(&binding->list);
2976 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2977 nft_is_active(ctx->net, set))
2978 nf_tables_set_destroy(ctx, set);
2981 const struct nft_set_ext_type nft_set_ext_types[] = {
2982 [NFT_SET_EXT_KEY] = {
2983 .align = __alignof__(u32),
2985 [NFT_SET_EXT_DATA] = {
2986 .align = __alignof__(u32),
2988 [NFT_SET_EXT_EXPR] = {
2989 .align = __alignof__(struct nft_expr),
2991 [NFT_SET_EXT_FLAGS] = {
2993 .align = __alignof__(u8),
2995 [NFT_SET_EXT_TIMEOUT] = {
2997 .align = __alignof__(u64),
2999 [NFT_SET_EXT_EXPIRATION] = {
3000 .len = sizeof(unsigned long),
3001 .align = __alignof__(unsigned long),
3003 [NFT_SET_EXT_USERDATA] = {
3004 .len = sizeof(struct nft_userdata),
3005 .align = __alignof__(struct nft_userdata),
3008 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3014 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3015 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3016 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3017 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3018 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3019 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3020 .len = NFT_USERDATA_MAXLEN },
3023 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3024 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
3025 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
3026 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3027 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3030 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3031 const struct sk_buff *skb,
3032 const struct nlmsghdr *nlh,
3033 const struct nlattr * const nla[],
3036 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3037 struct nft_af_info *afi;
3038 struct nft_table *table;
3040 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3042 return PTR_ERR(afi);
3044 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3047 return PTR_ERR(table);
3049 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3053 static int nf_tables_fill_setelem(struct sk_buff *skb,
3054 const struct nft_set *set,
3055 const struct nft_set_elem *elem)
3057 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3058 unsigned char *b = skb_tail_pointer(skb);
3059 struct nlattr *nest;
3061 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3063 goto nla_put_failure;
3065 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3066 NFT_DATA_VALUE, set->klen) < 0)
3067 goto nla_put_failure;
3069 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3070 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3071 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3073 goto nla_put_failure;
3075 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3076 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3077 goto nla_put_failure;
3079 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3080 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3081 htonl(*nft_set_ext_flags(ext))))
3082 goto nla_put_failure;
3084 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3085 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3086 cpu_to_be64(*nft_set_ext_timeout(ext)),
3088 goto nla_put_failure;
3090 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3091 unsigned long expires, now = jiffies;
3093 expires = *nft_set_ext_expiration(ext);
3094 if (time_before(now, expires))
3099 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3100 cpu_to_be64(jiffies_to_msecs(expires)),
3102 goto nla_put_failure;
3105 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3106 struct nft_userdata *udata;
3108 udata = nft_set_ext_userdata(ext);
3109 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3110 udata->len + 1, udata->data))
3111 goto nla_put_failure;
3114 nla_nest_end(skb, nest);
3122 struct nft_set_dump_args {
3123 const struct netlink_callback *cb;
3124 struct nft_set_iter iter;
3125 struct sk_buff *skb;
3128 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3129 const struct nft_set *set,
3130 const struct nft_set_iter *iter,
3131 const struct nft_set_elem *elem)
3133 struct nft_set_dump_args *args;
3135 args = container_of(iter, struct nft_set_dump_args, iter);
3136 return nf_tables_fill_setelem(args->skb, set, elem);
3139 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3141 struct net *net = sock_net(skb->sk);
3142 u8 genmask = nft_genmask_cur(net);
3143 const struct nft_set *set;
3144 struct nft_set_dump_args args;
3146 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3147 struct nfgenmsg *nfmsg;
3148 struct nlmsghdr *nlh;
3149 struct nlattr *nest;
3153 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3154 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3158 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3159 (void *)nla, genmask);
3163 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3166 return PTR_ERR(set);
3168 event = NFT_MSG_NEWSETELEM;
3169 event |= NFNL_SUBSYS_NFTABLES << 8;
3170 portid = NETLINK_CB(cb->skb).portid;
3171 seq = cb->nlh->nlmsg_seq;
3173 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3176 goto nla_put_failure;
3178 nfmsg = nlmsg_data(nlh);
3179 nfmsg->nfgen_family = ctx.afi->family;
3180 nfmsg->version = NFNETLINK_V0;
3181 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3183 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3184 goto nla_put_failure;
3185 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3186 goto nla_put_failure;
3188 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3190 goto nla_put_failure;
3194 args.iter.genmask = nft_genmask_cur(ctx.net);
3195 args.iter.skip = cb->args[0];
3196 args.iter.count = 0;
3198 args.iter.fn = nf_tables_dump_setelem;
3199 set->ops->walk(&ctx, set, &args.iter);
3201 nla_nest_end(skb, nest);
3202 nlmsg_end(skb, nlh);
3204 if (args.iter.err && args.iter.err != -EMSGSIZE)
3205 return args.iter.err;
3206 if (args.iter.count == cb->args[0])
3209 cb->args[0] = args.iter.count;
3216 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3217 struct sk_buff *skb, const struct nlmsghdr *nlh,
3218 const struct nlattr * const nla[])
3220 u8 genmask = nft_genmask_cur(net);
3221 const struct nft_set *set;
3225 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3229 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3232 return PTR_ERR(set);
3234 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3235 struct netlink_dump_control c = {
3236 .dump = nf_tables_dump_set,
3238 return netlink_dump_start(nlsk, skb, nlh, &c);
3243 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3244 const struct nft_ctx *ctx, u32 seq,
3245 u32 portid, int event, u16 flags,
3246 const struct nft_set *set,
3247 const struct nft_set_elem *elem)
3249 struct nfgenmsg *nfmsg;
3250 struct nlmsghdr *nlh;
3251 struct nlattr *nest;
3254 event |= NFNL_SUBSYS_NFTABLES << 8;
3255 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3258 goto nla_put_failure;
3260 nfmsg = nlmsg_data(nlh);
3261 nfmsg->nfgen_family = ctx->afi->family;
3262 nfmsg->version = NFNETLINK_V0;
3263 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3265 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3266 goto nla_put_failure;
3267 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3268 goto nla_put_failure;
3270 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3272 goto nla_put_failure;
3274 err = nf_tables_fill_setelem(skb, set, elem);
3276 goto nla_put_failure;
3278 nla_nest_end(skb, nest);
3280 nlmsg_end(skb, nlh);
3284 nlmsg_trim(skb, nlh);
3288 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3289 const struct nft_set *set,
3290 const struct nft_set_elem *elem,
3291 int event, u16 flags)
3293 struct net *net = ctx->net;
3294 u32 portid = ctx->portid;
3295 struct sk_buff *skb;
3298 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3302 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3306 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3313 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3317 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3321 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3323 struct nft_set *set)
3325 struct nft_trans *trans;
3327 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3331 nft_trans_elem_set(trans) = set;
3335 void *nft_set_elem_init(const struct nft_set *set,
3336 const struct nft_set_ext_tmpl *tmpl,
3337 const u32 *key, const u32 *data,
3338 u64 timeout, gfp_t gfp)
3340 struct nft_set_ext *ext;
3343 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3347 ext = nft_set_elem_ext(set, elem);
3348 nft_set_ext_init(ext, tmpl);
3350 memcpy(nft_set_ext_key(ext), key, set->klen);
3351 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3352 memcpy(nft_set_ext_data(ext), data, set->dlen);
3353 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3354 *nft_set_ext_expiration(ext) =
3355 jiffies + msecs_to_jiffies(timeout);
3356 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3357 *nft_set_ext_timeout(ext) = timeout;
3362 void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3364 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3366 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3367 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3368 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3369 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3370 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3374 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3376 static int nft_setelem_parse_flags(const struct nft_set *set,
3377 const struct nlattr *attr, u32 *flags)
3382 *flags = ntohl(nla_get_be32(attr));
3383 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3385 if (!(set->flags & NFT_SET_INTERVAL) &&
3386 *flags & NFT_SET_ELEM_INTERVAL_END)
3392 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3393 const struct nlattr *attr)
3395 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3396 struct nft_data_desc d1, d2;
3397 struct nft_set_ext_tmpl tmpl;
3398 struct nft_set_ext *ext;
3399 struct nft_set_elem elem;
3400 struct nft_set_binding *binding;
3401 struct nft_userdata *udata;
3402 struct nft_data data;
3403 enum nft_registers dreg;
3404 struct nft_trans *trans;
3410 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3411 nft_set_elem_policy);
3415 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3418 nft_set_ext_prepare(&tmpl);
3420 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3424 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3426 if (set->flags & NFT_SET_MAP) {
3427 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3428 !(flags & NFT_SET_ELEM_INTERVAL_END))
3430 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3431 flags & NFT_SET_ELEM_INTERVAL_END)
3434 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3439 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3440 if (!(set->flags & NFT_SET_TIMEOUT))
3442 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3443 } else if (set->flags & NFT_SET_TIMEOUT) {
3444 timeout = set->timeout;
3447 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3448 nla[NFTA_SET_ELEM_KEY]);
3452 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3455 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3457 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3458 if (timeout != set->timeout)
3459 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3462 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3463 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3464 nla[NFTA_SET_ELEM_DATA]);
3469 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3472 dreg = nft_type_to_reg(set->dtype);
3473 list_for_each_entry(binding, &set->bindings, list) {
3474 struct nft_ctx bind_ctx = {
3476 .table = ctx->table,
3477 .chain = (struct nft_chain *)binding->chain,
3480 if (!(binding->flags & NFT_SET_MAP))
3483 err = nft_validate_register_store(&bind_ctx, dreg,
3490 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3493 /* The full maximum length of userdata can exceed the maximum
3494 * offset value (U8_MAX) for following extensions, therefor it
3495 * must be the last extension added.
3498 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3499 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3501 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3506 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3507 timeout, GFP_KERNEL);
3508 if (elem.priv == NULL)
3511 ext = nft_set_elem_ext(set, elem.priv);
3513 *nft_set_ext_flags(ext) = flags;
3515 udata = nft_set_ext_userdata(ext);
3516 udata->len = ulen - 1;
3517 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3520 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3524 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3525 err = set->ops->insert(set, &elem);
3529 nft_trans_elem(trans) = elem;
3530 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3538 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3539 nft_data_uninit(&data, d2.type);
3541 nft_data_uninit(&elem.key.val, d1.type);
3546 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3547 struct sk_buff *skb, const struct nlmsghdr *nlh,
3548 const struct nlattr * const nla[])
3550 u8 genmask = nft_genmask_next(net);
3551 const struct nlattr *attr;
3552 struct nft_set *set;
3556 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3559 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3563 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3566 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3567 set = nf_tables_set_lookup_byid(net,
3568 nla[NFTA_SET_ELEM_LIST_SET_ID],
3572 return PTR_ERR(set);
3575 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3578 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3580 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3583 err = nft_add_set_elem(&ctx, set, attr);
3585 atomic_dec(&set->nelems);
3592 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3593 const struct nlattr *attr)
3595 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3596 struct nft_set_ext_tmpl tmpl;
3597 struct nft_data_desc desc;
3598 struct nft_set_elem elem;
3599 struct nft_set_ext *ext;
3600 struct nft_trans *trans;
3605 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3606 nft_set_elem_policy);
3611 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3614 nft_set_ext_prepare(&tmpl);
3616 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3620 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3622 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3623 nla[NFTA_SET_ELEM_KEY]);
3628 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3631 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3634 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3636 if (elem.priv == NULL)
3639 ext = nft_set_elem_ext(set, elem.priv);
3641 *nft_set_ext_flags(ext) = flags;
3643 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3644 if (trans == NULL) {
3649 priv = set->ops->deactivate(set, &elem);
3657 nft_trans_elem(trans) = elem;
3658 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3666 nft_data_uninit(&elem.key.val, desc.type);
3671 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3672 struct sk_buff *skb, const struct nlmsghdr *nlh,
3673 const struct nlattr * const nla[])
3675 u8 genmask = nft_genmask_next(net);
3676 const struct nlattr *attr;
3677 struct nft_set *set;
3681 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3684 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3688 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3691 return PTR_ERR(set);
3692 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3695 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3696 err = nft_del_setelem(&ctx, set, attr);
3705 void nft_set_gc_batch_release(struct rcu_head *rcu)
3707 struct nft_set_gc_batch *gcb;
3710 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3711 for (i = 0; i < gcb->head.cnt; i++)
3712 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3715 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3717 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3720 struct nft_set_gc_batch *gcb;
3722 gcb = kzalloc(sizeof(*gcb), gfp);
3725 gcb->head.set = set;
3728 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3730 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3731 u32 portid, u32 seq)
3733 struct nlmsghdr *nlh;
3734 struct nfgenmsg *nfmsg;
3735 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3737 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3739 goto nla_put_failure;
3741 nfmsg = nlmsg_data(nlh);
3742 nfmsg->nfgen_family = AF_UNSPEC;
3743 nfmsg->version = NFNETLINK_V0;
3744 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3746 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3747 goto nla_put_failure;
3749 nlmsg_end(skb, nlh);
3753 nlmsg_trim(skb, nlh);
3757 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3759 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3760 struct sk_buff *skb2;
3763 if (nlmsg_report(nlh) &&
3764 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3768 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3772 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3779 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3780 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3783 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3789 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
3790 struct sk_buff *skb, const struct nlmsghdr *nlh,
3791 const struct nlattr * const nla[])
3793 struct sk_buff *skb2;
3796 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3800 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3805 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3811 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3812 [NFT_MSG_NEWTABLE] = {
3813 .call_batch = nf_tables_newtable,
3814 .attr_count = NFTA_TABLE_MAX,
3815 .policy = nft_table_policy,
3817 [NFT_MSG_GETTABLE] = {
3818 .call = nf_tables_gettable,
3819 .attr_count = NFTA_TABLE_MAX,
3820 .policy = nft_table_policy,
3822 [NFT_MSG_DELTABLE] = {
3823 .call_batch = nf_tables_deltable,
3824 .attr_count = NFTA_TABLE_MAX,
3825 .policy = nft_table_policy,
3827 [NFT_MSG_NEWCHAIN] = {
3828 .call_batch = nf_tables_newchain,
3829 .attr_count = NFTA_CHAIN_MAX,
3830 .policy = nft_chain_policy,
3832 [NFT_MSG_GETCHAIN] = {
3833 .call = nf_tables_getchain,
3834 .attr_count = NFTA_CHAIN_MAX,
3835 .policy = nft_chain_policy,
3837 [NFT_MSG_DELCHAIN] = {
3838 .call_batch = nf_tables_delchain,
3839 .attr_count = NFTA_CHAIN_MAX,
3840 .policy = nft_chain_policy,
3842 [NFT_MSG_NEWRULE] = {
3843 .call_batch = nf_tables_newrule,
3844 .attr_count = NFTA_RULE_MAX,
3845 .policy = nft_rule_policy,
3847 [NFT_MSG_GETRULE] = {
3848 .call = nf_tables_getrule,
3849 .attr_count = NFTA_RULE_MAX,
3850 .policy = nft_rule_policy,
3852 [NFT_MSG_DELRULE] = {
3853 .call_batch = nf_tables_delrule,
3854 .attr_count = NFTA_RULE_MAX,
3855 .policy = nft_rule_policy,
3857 [NFT_MSG_NEWSET] = {
3858 .call_batch = nf_tables_newset,
3859 .attr_count = NFTA_SET_MAX,
3860 .policy = nft_set_policy,
3862 [NFT_MSG_GETSET] = {
3863 .call = nf_tables_getset,
3864 .attr_count = NFTA_SET_MAX,
3865 .policy = nft_set_policy,
3867 [NFT_MSG_DELSET] = {
3868 .call_batch = nf_tables_delset,
3869 .attr_count = NFTA_SET_MAX,
3870 .policy = nft_set_policy,
3872 [NFT_MSG_NEWSETELEM] = {
3873 .call_batch = nf_tables_newsetelem,
3874 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3875 .policy = nft_set_elem_list_policy,
3877 [NFT_MSG_GETSETELEM] = {
3878 .call = nf_tables_getsetelem,
3879 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3880 .policy = nft_set_elem_list_policy,
3882 [NFT_MSG_DELSETELEM] = {
3883 .call_batch = nf_tables_delsetelem,
3884 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3885 .policy = nft_set_elem_list_policy,
3887 [NFT_MSG_GETGEN] = {
3888 .call = nf_tables_getgen,
3892 static void nft_chain_commit_update(struct nft_trans *trans)
3894 struct nft_base_chain *basechain;
3896 if (nft_trans_chain_name(trans)[0])
3897 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3899 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3902 basechain = nft_base_chain(trans->ctx.chain);
3903 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3905 switch (nft_trans_chain_policy(trans)) {
3908 basechain->policy = nft_trans_chain_policy(trans);
3913 static void nf_tables_commit_release(struct nft_trans *trans)
3915 switch (trans->msg_type) {
3916 case NFT_MSG_DELTABLE:
3917 nf_tables_table_destroy(&trans->ctx);
3919 case NFT_MSG_DELCHAIN:
3920 nf_tables_chain_destroy(trans->ctx.chain);
3922 case NFT_MSG_DELRULE:
3923 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3925 case NFT_MSG_DELSET:
3926 nft_set_destroy(nft_trans_set(trans));
3928 case NFT_MSG_DELSETELEM:
3929 nft_set_elem_destroy(nft_trans_elem_set(trans),
3930 nft_trans_elem(trans).priv);
3936 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
3938 struct nft_trans *trans, *next;
3939 struct nft_trans_elem *te;
3941 /* Bump generation counter, invalidate any dump in progress */
3942 while (++net->nft.base_seq == 0);
3944 /* A new generation has just started */
3945 net->nft.gencursor = nft_gencursor_next(net);
3947 /* Make sure all packets have left the previous generation before
3948 * purging old rules.
3952 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3953 switch (trans->msg_type) {
3954 case NFT_MSG_NEWTABLE:
3955 if (nft_trans_table_update(trans)) {
3956 if (!nft_trans_table_enable(trans)) {
3957 nf_tables_table_disable(net,
3960 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3963 nft_clear(net, trans->ctx.table);
3965 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3966 nft_trans_destroy(trans);
3968 case NFT_MSG_DELTABLE:
3969 list_del_rcu(&trans->ctx.table->list);
3970 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3972 case NFT_MSG_NEWCHAIN:
3973 if (nft_trans_chain_update(trans))
3974 nft_chain_commit_update(trans);
3976 nft_clear(net, trans->ctx.chain);
3978 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3979 nft_trans_destroy(trans);
3981 case NFT_MSG_DELCHAIN:
3982 list_del_rcu(&trans->ctx.chain->list);
3983 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3984 nf_tables_unregister_hooks(trans->ctx.net,
3987 trans->ctx.afi->nops);
3989 case NFT_MSG_NEWRULE:
3990 nft_clear(trans->ctx.net, nft_trans_rule(trans));
3991 nf_tables_rule_notify(&trans->ctx,
3992 nft_trans_rule(trans),
3994 nft_trans_destroy(trans);
3996 case NFT_MSG_DELRULE:
3997 list_del_rcu(&nft_trans_rule(trans)->list);
3998 nf_tables_rule_notify(&trans->ctx,
3999 nft_trans_rule(trans),
4002 case NFT_MSG_NEWSET:
4003 nft_clear(net, nft_trans_set(trans));
4004 /* This avoids hitting -EBUSY when deleting the table
4005 * from the transaction.
4007 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4008 !list_empty(&nft_trans_set(trans)->bindings))
4009 trans->ctx.table->use--;
4011 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4012 NFT_MSG_NEWSET, GFP_KERNEL);
4013 nft_trans_destroy(trans);
4015 case NFT_MSG_DELSET:
4016 list_del_rcu(&nft_trans_set(trans)->list);
4017 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4018 NFT_MSG_DELSET, GFP_KERNEL);
4020 case NFT_MSG_NEWSETELEM:
4021 te = (struct nft_trans_elem *)trans->data;
4023 te->set->ops->activate(te->set, &te->elem);
4024 nf_tables_setelem_notify(&trans->ctx, te->set,
4026 NFT_MSG_NEWSETELEM, 0);
4027 nft_trans_destroy(trans);
4029 case NFT_MSG_DELSETELEM:
4030 te = (struct nft_trans_elem *)trans->data;
4032 nf_tables_setelem_notify(&trans->ctx, te->set,
4034 NFT_MSG_DELSETELEM, 0);
4035 te->set->ops->remove(te->set, &te->elem);
4036 atomic_dec(&te->set->nelems);
4044 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4045 list_del(&trans->list);
4046 nf_tables_commit_release(trans);
4049 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4054 static void nf_tables_abort_release(struct nft_trans *trans)
4056 switch (trans->msg_type) {
4057 case NFT_MSG_NEWTABLE:
4058 nf_tables_table_destroy(&trans->ctx);
4060 case NFT_MSG_NEWCHAIN:
4061 nf_tables_chain_destroy(trans->ctx.chain);
4063 case NFT_MSG_NEWRULE:
4064 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4066 case NFT_MSG_NEWSET:
4067 nft_set_destroy(nft_trans_set(trans));
4069 case NFT_MSG_NEWSETELEM:
4070 nft_set_elem_destroy(nft_trans_elem_set(trans),
4071 nft_trans_elem(trans).priv);
4077 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4079 struct nft_trans *trans, *next;
4080 struct nft_trans_elem *te;
4082 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4084 switch (trans->msg_type) {
4085 case NFT_MSG_NEWTABLE:
4086 if (nft_trans_table_update(trans)) {
4087 if (nft_trans_table_enable(trans)) {
4088 nf_tables_table_disable(net,
4091 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4093 nft_trans_destroy(trans);
4095 list_del_rcu(&trans->ctx.table->list);
4098 case NFT_MSG_DELTABLE:
4099 nft_clear(trans->ctx.net, trans->ctx.table);
4100 nft_trans_destroy(trans);
4102 case NFT_MSG_NEWCHAIN:
4103 if (nft_trans_chain_update(trans)) {
4104 free_percpu(nft_trans_chain_stats(trans));
4106 nft_trans_destroy(trans);
4108 trans->ctx.table->use--;
4109 list_del_rcu(&trans->ctx.chain->list);
4110 nf_tables_unregister_hooks(trans->ctx.net,
4113 trans->ctx.afi->nops);
4116 case NFT_MSG_DELCHAIN:
4117 trans->ctx.table->use++;
4118 nft_clear(trans->ctx.net, trans->ctx.chain);
4119 nft_trans_destroy(trans);
4121 case NFT_MSG_NEWRULE:
4122 trans->ctx.chain->use--;
4123 list_del_rcu(&nft_trans_rule(trans)->list);
4125 case NFT_MSG_DELRULE:
4126 trans->ctx.chain->use++;
4127 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4128 nft_trans_destroy(trans);
4130 case NFT_MSG_NEWSET:
4131 trans->ctx.table->use--;
4132 list_del_rcu(&nft_trans_set(trans)->list);
4134 case NFT_MSG_DELSET:
4135 trans->ctx.table->use++;
4136 nft_clear(trans->ctx.net, nft_trans_set(trans));
4137 nft_trans_destroy(trans);
4139 case NFT_MSG_NEWSETELEM:
4140 te = (struct nft_trans_elem *)trans->data;
4142 te->set->ops->remove(te->set, &te->elem);
4143 atomic_dec(&te->set->nelems);
4145 case NFT_MSG_DELSETELEM:
4146 te = (struct nft_trans_elem *)trans->data;
4148 te->set->ops->activate(te->set, &te->elem);
4151 nft_trans_destroy(trans);
4158 list_for_each_entry_safe_reverse(trans, next,
4159 &net->nft.commit_list, list) {
4160 list_del(&trans->list);
4161 nf_tables_abort_release(trans);
4167 static const struct nfnetlink_subsystem nf_tables_subsys = {
4168 .name = "nf_tables",
4169 .subsys_id = NFNL_SUBSYS_NFTABLES,
4170 .cb_count = NFT_MSG_MAX,
4172 .commit = nf_tables_commit,
4173 .abort = nf_tables_abort,
4176 int nft_chain_validate_dependency(const struct nft_chain *chain,
4177 enum nft_chain_type type)
4179 const struct nft_base_chain *basechain;
4181 if (chain->flags & NFT_BASE_CHAIN) {
4182 basechain = nft_base_chain(chain);
4183 if (basechain->type->type != type)
4188 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4190 int nft_chain_validate_hooks(const struct nft_chain *chain,
4191 unsigned int hook_flags)
4193 struct nft_base_chain *basechain;
4195 if (chain->flags & NFT_BASE_CHAIN) {
4196 basechain = nft_base_chain(chain);
4198 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4206 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4209 * Loop detection - walk through the ruleset beginning at the destination chain
4210 * of a new jump until either the source chain is reached (loop) or all
4211 * reachable chains have been traversed.
4213 * The loop check is performed whenever a new jump verdict is added to an
4214 * expression or verdict map or a verdict map is bound to a new chain.
4217 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4218 const struct nft_chain *chain);
4220 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4221 const struct nft_set *set,
4222 const struct nft_set_iter *iter,
4223 const struct nft_set_elem *elem)
4225 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4226 const struct nft_data *data;
4228 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4229 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
4232 data = nft_set_ext_data(ext);
4233 switch (data->verdict.code) {
4236 return nf_tables_check_loops(ctx, data->verdict.chain);
4242 static int nf_tables_check_loops(const struct nft_ctx *ctx,
4243 const struct nft_chain *chain)
4245 const struct nft_rule *rule;
4246 const struct nft_expr *expr, *last;
4247 const struct nft_set *set;
4248 struct nft_set_binding *binding;
4249 struct nft_set_iter iter;
4251 if (ctx->chain == chain)
4254 list_for_each_entry(rule, &chain->rules, list) {
4255 nft_rule_for_each_expr(expr, last, rule) {
4256 const struct nft_data *data = NULL;
4259 if (!expr->ops->validate)
4262 err = expr->ops->validate(ctx, expr, &data);
4269 switch (data->verdict.code) {
4272 err = nf_tables_check_loops(ctx,
4273 data->verdict.chain);
4282 list_for_each_entry(set, &ctx->table->sets, list) {
4283 if (!nft_is_active_next(ctx->net, set))
4285 if (!(set->flags & NFT_SET_MAP) ||
4286 set->dtype != NFT_DATA_VERDICT)
4289 list_for_each_entry(binding, &set->bindings, list) {
4290 if (!(binding->flags & NFT_SET_MAP) ||
4291 binding->chain != chain)
4294 iter.genmask = nft_genmask_next(ctx->net);
4298 iter.fn = nf_tables_loop_check_setelem;
4300 set->ops->walk(ctx, set, &iter);
4310 * nft_parse_register - parse a register value from a netlink attribute
4312 * @attr: netlink attribute
4314 * Parse and translate a register value from a netlink attribute.
4315 * Registers used to be 128 bit wide, these register numbers will be
4316 * mapped to the corresponding 32 bit register numbers.
4318 unsigned int nft_parse_register(const struct nlattr *attr)
4322 reg = ntohl(nla_get_be32(attr));
4324 case NFT_REG_VERDICT...NFT_REG_4:
4325 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4327 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4330 EXPORT_SYMBOL_GPL(nft_parse_register);
4333 * nft_dump_register - dump a register value to a netlink attribute
4335 * @skb: socket buffer
4336 * @attr: attribute number
4337 * @reg: register number
4339 * Construct a netlink attribute containing the register number. For
4340 * compatibility reasons, register numbers being a multiple of 4 are
4341 * translated to the corresponding 128 bit register numbers.
4343 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4345 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4346 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4348 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4350 return nla_put_be32(skb, attr, htonl(reg));
4352 EXPORT_SYMBOL_GPL(nft_dump_register);
4355 * nft_validate_register_load - validate a load from a register
4357 * @reg: the register number
4358 * @len: the length of the data
4360 * Validate that the input register is one of the general purpose
4361 * registers and that the length of the load is within the bounds.
4363 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
4365 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4369 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
4374 EXPORT_SYMBOL_GPL(nft_validate_register_load);
4377 * nft_validate_register_store - validate an expressions' register store
4379 * @ctx: context of the expression performing the load
4380 * @reg: the destination register number
4381 * @data: the data to load
4382 * @type: the data type
4383 * @len: the length of the data
4385 * Validate that a data load uses the appropriate data type for
4386 * the destination register and the length is within the bounds.
4387 * A value of NULL for the data means that its runtime gathered
4390 int nft_validate_register_store(const struct nft_ctx *ctx,
4391 enum nft_registers reg,
4392 const struct nft_data *data,
4393 enum nft_data_types type, unsigned int len)
4398 case NFT_REG_VERDICT:
4399 if (type != NFT_DATA_VERDICT)
4403 (data->verdict.code == NFT_GOTO ||
4404 data->verdict.code == NFT_JUMP)) {
4405 err = nf_tables_check_loops(ctx, data->verdict.chain);
4409 if (ctx->chain->level + 1 >
4410 data->verdict.chain->level) {
4411 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4413 data->verdict.chain->level = ctx->chain->level + 1;
4419 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
4423 if (reg * NFT_REG32_SIZE + len >
4424 FIELD_SIZEOF(struct nft_regs, data))
4427 if (data != NULL && type != NFT_DATA_VALUE)
4432 EXPORT_SYMBOL_GPL(nft_validate_register_store);
4434 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4435 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4436 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4437 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4440 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4441 struct nft_data_desc *desc, const struct nlattr *nla)
4443 u8 genmask = nft_genmask_next(ctx->net);
4444 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4445 struct nft_chain *chain;
4448 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4452 if (!tb[NFTA_VERDICT_CODE])
4454 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
4456 switch (data->verdict.code) {
4458 switch (data->verdict.code & NF_VERDICT_MASK) {
4473 if (!tb[NFTA_VERDICT_CHAIN])
4475 chain = nf_tables_chain_lookup(ctx->table,
4476 tb[NFTA_VERDICT_CHAIN], genmask);
4478 return PTR_ERR(chain);
4479 if (chain->flags & NFT_BASE_CHAIN)
4483 data->verdict.chain = chain;
4487 desc->len = sizeof(data->verdict);
4488 desc->type = NFT_DATA_VERDICT;
4492 static void nft_verdict_uninit(const struct nft_data *data)
4494 switch (data->verdict.code) {
4497 data->verdict.chain->use--;
4502 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
4504 struct nlattr *nest;
4506 nest = nla_nest_start(skb, type);
4508 goto nla_put_failure;
4510 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
4511 goto nla_put_failure;
4516 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
4518 goto nla_put_failure;
4520 nla_nest_end(skb, nest);
4527 static int nft_value_init(const struct nft_ctx *ctx,
4528 struct nft_data *data, unsigned int size,
4529 struct nft_data_desc *desc, const struct nlattr *nla)
4539 nla_memcpy(data->data, nla, len);
4540 desc->type = NFT_DATA_VALUE;
4545 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4548 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4551 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4552 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
4553 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4557 * nft_data_init - parse nf_tables data netlink attributes
4559 * @ctx: context of the expression using the data
4560 * @data: destination struct nft_data
4561 * @size: maximum data length
4562 * @desc: data description
4563 * @nla: netlink attribute containing data
4565 * Parse the netlink data attributes and initialize a struct nft_data.
4566 * The type and length of data are returned in the data description.
4568 * The caller can indicate that it only wants to accept data of type
4569 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4571 int nft_data_init(const struct nft_ctx *ctx,
4572 struct nft_data *data, unsigned int size,
4573 struct nft_data_desc *desc, const struct nlattr *nla)
4575 struct nlattr *tb[NFTA_DATA_MAX + 1];
4578 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4582 if (tb[NFTA_DATA_VALUE])
4583 return nft_value_init(ctx, data, size, desc,
4584 tb[NFTA_DATA_VALUE]);
4585 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4586 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4589 EXPORT_SYMBOL_GPL(nft_data_init);
4592 * nft_data_uninit - release a nft_data item
4594 * @data: struct nft_data to release
4595 * @type: type of data
4597 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4598 * all others need to be released by calling this function.
4600 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4602 if (type < NFT_DATA_VERDICT)
4605 case NFT_DATA_VERDICT:
4606 return nft_verdict_uninit(data);
4611 EXPORT_SYMBOL_GPL(nft_data_uninit);
4613 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4614 enum nft_data_types type, unsigned int len)
4616 struct nlattr *nest;
4619 nest = nla_nest_start(skb, attr);
4624 case NFT_DATA_VALUE:
4625 err = nft_value_dump(skb, data, len);
4627 case NFT_DATA_VERDICT:
4628 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
4635 nla_nest_end(skb, nest);
4638 EXPORT_SYMBOL_GPL(nft_data_dump);
4640 static int __net_init nf_tables_init_net(struct net *net)
4642 INIT_LIST_HEAD(&net->nft.af_info);
4643 INIT_LIST_HEAD(&net->nft.commit_list);
4644 net->nft.base_seq = 1;
4648 int __nft_release_basechain(struct nft_ctx *ctx)
4650 struct nft_rule *rule, *nr;
4652 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
4654 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
4656 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
4657 list_del(&rule->list);
4659 nf_tables_rule_destroy(ctx, rule);
4661 list_del(&ctx->chain->list);
4663 nf_tables_chain_destroy(ctx->chain);
4667 EXPORT_SYMBOL_GPL(__nft_release_basechain);
4669 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
4670 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
4672 struct nft_table *table, *nt;
4673 struct nft_chain *chain, *nc;
4674 struct nft_rule *rule, *nr;
4675 struct nft_set *set, *ns;
4676 struct nft_ctx ctx = {
4681 list_for_each_entry_safe(table, nt, &afi->tables, list) {
4682 list_for_each_entry(chain, &table->chains, list)
4683 nf_tables_unregister_hooks(net, table, chain,
4685 /* No packets are walking on these chains anymore. */
4687 list_for_each_entry(chain, &table->chains, list) {
4689 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
4690 list_del(&rule->list);
4692 nf_tables_rule_destroy(&ctx, rule);
4695 list_for_each_entry_safe(set, ns, &table->sets, list) {
4696 list_del(&set->list);
4698 nft_set_destroy(set);
4700 list_for_each_entry_safe(chain, nc, &table->chains, list) {
4701 list_del(&chain->list);
4703 nf_tables_chain_destroy(chain);
4705 list_del(&table->list);
4706 nf_tables_table_destroy(&ctx);
4710 static struct pernet_operations nf_tables_net_ops = {
4711 .init = nf_tables_init_net,
4714 static int __init nf_tables_module_init(void)
4718 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4725 err = nf_tables_core_module_init();
4729 err = nfnetlink_subsys_register(&nf_tables_subsys);
4733 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4734 return register_pernet_subsys(&nf_tables_net_ops);
4736 nf_tables_core_module_exit();
4743 static void __exit nf_tables_module_exit(void)
4745 unregister_pernet_subsys(&nf_tables_net_ops);
4746 nfnetlink_subsys_unregister(&nf_tables_subsys);
4748 nf_tables_core_module_exit();
4752 module_init(nf_tables_module_init);
4753 module_exit(nf_tables_module_exit);
4755 MODULE_LICENSE("GPL");
4756 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4757 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);