2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/net_namespace.h>
24 static LIST_HEAD(nf_tables_expressions);
27 * nft_register_afinfo - register nf_tables address family info
29 * @afi: address family info to register
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
34 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
36 INIT_LIST_HEAD(&afi->tables);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES);
38 list_add_tail_rcu(&afi->list, &net->nft.af_info);
39 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
42 EXPORT_SYMBOL_GPL(nft_register_afinfo);
45 * nft_unregister_afinfo - unregister nf_tables address family info
47 * @afi: address family info to unregister
49 * Unregister the address family for use with nf_tables.
51 void nft_unregister_afinfo(struct nft_af_info *afi)
53 nfnl_lock(NFNL_SUBSYS_NFTABLES);
54 list_del_rcu(&afi->list);
55 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
57 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
59 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
61 struct nft_af_info *afi;
63 list_for_each_entry(afi, &net->nft.af_info, list) {
64 if (afi->family == family)
70 static struct nft_af_info *
71 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
73 struct nft_af_info *afi;
75 afi = nft_afinfo_lookup(net, family);
80 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
81 request_module("nft-afinfo-%u", family);
82 nfnl_lock(NFNL_SUBSYS_NFTABLES);
83 afi = nft_afinfo_lookup(net, family);
85 return ERR_PTR(-EAGAIN);
88 return ERR_PTR(-EAFNOSUPPORT);
91 static void nft_ctx_init(struct nft_ctx *ctx,
92 const struct sk_buff *skb,
93 const struct nlmsghdr *nlh,
94 struct nft_af_info *afi,
95 struct nft_table *table,
96 struct nft_chain *chain,
97 const struct nlattr * const *nla)
99 ctx->net = sock_net(skb->sk);
104 ctx->portid = NETLINK_CB(skb).portid;
105 ctx->report = nlmsg_report(nlh);
106 ctx->seq = nlh->nlmsg_seq;
109 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
112 struct nft_trans *trans;
114 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
118 trans->msg_type = msg_type;
124 static void nft_trans_destroy(struct nft_trans *trans)
126 list_del(&trans->list);
134 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
135 const struct nlattr *nla)
137 struct nft_table *table;
139 list_for_each_entry(table, &afi->tables, list) {
140 if (!nla_strcmp(nla, table->name))
146 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
147 const struct nlattr *nla)
149 struct nft_table *table;
152 return ERR_PTR(-EINVAL);
154 table = nft_table_lookup(afi, nla);
158 return ERR_PTR(-ENOENT);
161 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
163 return ++table->hgenerator;
166 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
168 static const struct nf_chain_type *
169 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
173 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
174 if (chain_type[family][i] != NULL &&
175 !nla_strcmp(nla, chain_type[family][i]->name))
176 return chain_type[family][i];
181 static const struct nf_chain_type *
182 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
183 const struct nlattr *nla,
186 const struct nf_chain_type *type;
188 type = __nf_tables_chain_type_lookup(afi->family, nla);
191 #ifdef CONFIG_MODULES
193 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
194 request_module("nft-chain-%u-%.*s", afi->family,
195 nla_len(nla), (const char *)nla_data(nla));
196 nfnl_lock(NFNL_SUBSYS_NFTABLES);
197 type = __nf_tables_chain_type_lookup(afi->family, nla);
199 return ERR_PTR(-EAGAIN);
202 return ERR_PTR(-ENOENT);
205 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
206 [NFTA_TABLE_NAME] = { .type = NLA_STRING },
207 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
210 static int nf_tables_fill_table_info(struct sk_buff *skb, u32 portid, u32 seq,
211 int event, u32 flags, int family,
212 const struct nft_table *table)
214 struct nlmsghdr *nlh;
215 struct nfgenmsg *nfmsg;
217 event |= NFNL_SUBSYS_NFTABLES << 8;
218 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
220 goto nla_put_failure;
222 nfmsg = nlmsg_data(nlh);
223 nfmsg->nfgen_family = family;
224 nfmsg->version = NFNETLINK_V0;
227 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
228 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
229 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
230 goto nla_put_failure;
232 return nlmsg_end(skb, nlh);
235 nlmsg_trim(skb, nlh);
239 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
245 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
249 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
253 err = nf_tables_fill_table_info(skb, ctx->portid, ctx->seq, event, 0,
254 ctx->afi->family, ctx->table);
260 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
261 ctx->report, GFP_KERNEL);
264 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
270 static int nf_tables_dump_tables(struct sk_buff *skb,
271 struct netlink_callback *cb)
273 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
274 const struct nft_af_info *afi;
275 const struct nft_table *table;
276 unsigned int idx = 0, s_idx = cb->args[0];
277 struct net *net = sock_net(skb->sk);
278 int family = nfmsg->nfgen_family;
281 cb->seq = net->nft.base_seq;
283 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
284 if (family != NFPROTO_UNSPEC && family != afi->family)
287 list_for_each_entry_rcu(table, &afi->tables, list) {
291 memset(&cb->args[1], 0,
292 sizeof(cb->args) - sizeof(cb->args[0]));
293 if (nf_tables_fill_table_info(skb,
294 NETLINK_CB(cb->skb).portid,
298 afi->family, table) < 0)
301 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
312 /* Internal table flags */
313 #define NFT_TABLE_INACTIVE (1 << 15)
315 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
316 const struct nlmsghdr *nlh,
317 const struct nlattr * const nla[])
319 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
320 const struct nft_af_info *afi;
321 const struct nft_table *table;
322 struct sk_buff *skb2;
323 struct net *net = sock_net(skb->sk);
324 int family = nfmsg->nfgen_family;
327 if (nlh->nlmsg_flags & NLM_F_DUMP) {
328 struct netlink_dump_control c = {
329 .dump = nf_tables_dump_tables,
331 return netlink_dump_start(nlsk, skb, nlh, &c);
334 afi = nf_tables_afinfo_lookup(net, family, false);
338 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
340 return PTR_ERR(table);
341 if (table->flags & NFT_TABLE_INACTIVE)
344 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
348 err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid,
349 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
354 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
361 static int nf_tables_table_enable(const struct nft_af_info *afi,
362 struct nft_table *table)
364 struct nft_chain *chain;
367 list_for_each_entry(chain, &table->chains, list) {
368 if (!(chain->flags & NFT_BASE_CHAIN))
371 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
379 list_for_each_entry(chain, &table->chains, list) {
380 if (!(chain->flags & NFT_BASE_CHAIN))
386 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
391 static void nf_tables_table_disable(const struct nft_af_info *afi,
392 struct nft_table *table)
394 struct nft_chain *chain;
396 list_for_each_entry(chain, &table->chains, list) {
397 if (chain->flags & NFT_BASE_CHAIN)
398 nf_unregister_hooks(nft_base_chain(chain)->ops,
403 static int nf_tables_updtable(struct nft_ctx *ctx)
405 struct nft_trans *trans;
409 if (!ctx->nla[NFTA_TABLE_FLAGS])
412 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
413 if (flags & ~NFT_TABLE_F_DORMANT)
416 if (flags == ctx->table->flags)
419 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
420 sizeof(struct nft_trans_table));
424 if ((flags & NFT_TABLE_F_DORMANT) &&
425 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
426 nft_trans_table_enable(trans) = false;
427 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
428 ctx->table->flags & NFT_TABLE_F_DORMANT) {
429 ret = nf_tables_table_enable(ctx->afi, ctx->table);
431 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
432 nft_trans_table_enable(trans) = true;
438 nft_trans_table_update(trans) = true;
439 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
442 nft_trans_destroy(trans);
446 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
448 struct nft_trans *trans;
450 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
454 if (msg_type == NFT_MSG_NEWTABLE)
455 ctx->table->flags |= NFT_TABLE_INACTIVE;
457 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
461 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
462 const struct nlmsghdr *nlh,
463 const struct nlattr * const nla[])
465 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
466 const struct nlattr *name;
467 struct nft_af_info *afi;
468 struct nft_table *table;
469 struct net *net = sock_net(skb->sk);
470 int family = nfmsg->nfgen_family;
475 afi = nf_tables_afinfo_lookup(net, family, true);
479 name = nla[NFTA_TABLE_NAME];
480 table = nf_tables_table_lookup(afi, name);
482 if (PTR_ERR(table) != -ENOENT)
483 return PTR_ERR(table);
488 if (table->flags & NFT_TABLE_INACTIVE)
490 if (nlh->nlmsg_flags & NLM_F_EXCL)
492 if (nlh->nlmsg_flags & NLM_F_REPLACE)
495 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
496 return nf_tables_updtable(&ctx);
499 if (nla[NFTA_TABLE_FLAGS]) {
500 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
501 if (flags & ~NFT_TABLE_F_DORMANT)
505 if (!try_module_get(afi->owner))
506 return -EAFNOSUPPORT;
508 table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL);
510 module_put(afi->owner);
514 nla_strlcpy(table->name, name, nla_len(name));
515 INIT_LIST_HEAD(&table->chains);
516 INIT_LIST_HEAD(&table->sets);
517 table->flags = flags;
519 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
520 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
523 module_put(afi->owner);
526 list_add_tail_rcu(&table->list, &afi->tables);
530 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
531 const struct nlmsghdr *nlh,
532 const struct nlattr * const nla[])
534 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
535 struct nft_af_info *afi;
536 struct nft_table *table;
537 struct net *net = sock_net(skb->sk);
538 int family = nfmsg->nfgen_family, err;
541 afi = nf_tables_afinfo_lookup(net, family, false);
545 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
547 return PTR_ERR(table);
548 if (table->flags & NFT_TABLE_INACTIVE)
553 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
554 err = nft_trans_table_add(&ctx, NFT_MSG_DELTABLE);
558 list_del_rcu(&table->list);
562 static void nf_tables_table_destroy(struct nft_ctx *ctx)
564 BUG_ON(ctx->table->use > 0);
567 module_put(ctx->afi->owner);
570 int nft_register_chain_type(const struct nf_chain_type *ctype)
574 nfnl_lock(NFNL_SUBSYS_NFTABLES);
575 if (chain_type[ctype->family][ctype->type] != NULL) {
579 chain_type[ctype->family][ctype->type] = ctype;
581 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
584 EXPORT_SYMBOL_GPL(nft_register_chain_type);
586 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
588 nfnl_lock(NFNL_SUBSYS_NFTABLES);
589 chain_type[ctype->family][ctype->type] = NULL;
590 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
592 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
598 static struct nft_chain *
599 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
601 struct nft_chain *chain;
603 list_for_each_entry(chain, &table->chains, list) {
604 if (chain->handle == handle)
608 return ERR_PTR(-ENOENT);
611 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
612 const struct nlattr *nla)
614 struct nft_chain *chain;
617 return ERR_PTR(-EINVAL);
619 list_for_each_entry(chain, &table->chains, list) {
620 if (!nla_strcmp(nla, chain->name))
624 return ERR_PTR(-ENOENT);
627 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
628 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
629 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
630 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
631 .len = NFT_CHAIN_MAXNAMELEN - 1 },
632 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
633 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
634 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
635 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
638 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
639 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
640 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
643 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
645 struct nft_stats *cpu_stats, total;
651 memset(&total, 0, sizeof(total));
652 for_each_possible_cpu(cpu) {
653 cpu_stats = per_cpu_ptr(stats, cpu);
655 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
656 pkts = cpu_stats->pkts;
657 bytes = cpu_stats->bytes;
658 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
660 total.bytes += bytes;
662 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
664 goto nla_put_failure;
666 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
667 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
668 goto nla_put_failure;
670 nla_nest_end(skb, nest);
677 static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq,
678 int event, u32 flags, int family,
679 const struct nft_table *table,
680 const struct nft_chain *chain)
682 struct nlmsghdr *nlh;
683 struct nfgenmsg *nfmsg;
685 event |= NFNL_SUBSYS_NFTABLES << 8;
686 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
688 goto nla_put_failure;
690 nfmsg = nlmsg_data(nlh);
691 nfmsg->nfgen_family = family;
692 nfmsg->version = NFNETLINK_V0;
695 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
696 goto nla_put_failure;
697 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
698 goto nla_put_failure;
699 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
700 goto nla_put_failure;
702 if (chain->flags & NFT_BASE_CHAIN) {
703 const struct nft_base_chain *basechain = nft_base_chain(chain);
704 const struct nf_hook_ops *ops = &basechain->ops[0];
707 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
709 goto nla_put_failure;
710 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
711 goto nla_put_failure;
712 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
713 goto nla_put_failure;
714 nla_nest_end(skb, nest);
716 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
717 htonl(basechain->policy)))
718 goto nla_put_failure;
720 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
721 goto nla_put_failure;
723 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
724 goto nla_put_failure;
727 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
728 goto nla_put_failure;
730 return nlmsg_end(skb, nlh);
733 nlmsg_trim(skb, nlh);
737 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
743 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
747 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
751 err = nf_tables_fill_chain_info(skb, ctx->portid, ctx->seq, event, 0,
752 ctx->afi->family, ctx->table,
759 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
760 ctx->report, GFP_KERNEL);
763 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
769 static int nf_tables_dump_chains(struct sk_buff *skb,
770 struct netlink_callback *cb)
772 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
773 const struct nft_af_info *afi;
774 const struct nft_table *table;
775 const struct nft_chain *chain;
776 unsigned int idx = 0, s_idx = cb->args[0];
777 struct net *net = sock_net(skb->sk);
778 int family = nfmsg->nfgen_family;
781 cb->seq = net->nft.base_seq;
783 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
784 if (family != NFPROTO_UNSPEC && family != afi->family)
787 list_for_each_entry_rcu(table, &afi->tables, list) {
788 list_for_each_entry_rcu(chain, &table->chains, list) {
792 memset(&cb->args[1], 0,
793 sizeof(cb->args) - sizeof(cb->args[0]));
794 if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid,
798 afi->family, table, chain) < 0)
801 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
813 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
814 const struct nlmsghdr *nlh,
815 const struct nlattr * const nla[])
817 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
818 const struct nft_af_info *afi;
819 const struct nft_table *table;
820 const struct nft_chain *chain;
821 struct sk_buff *skb2;
822 struct net *net = sock_net(skb->sk);
823 int family = nfmsg->nfgen_family;
826 if (nlh->nlmsg_flags & NLM_F_DUMP) {
827 struct netlink_dump_control c = {
828 .dump = nf_tables_dump_chains,
830 return netlink_dump_start(nlsk, skb, nlh, &c);
833 afi = nf_tables_afinfo_lookup(net, family, false);
837 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
839 return PTR_ERR(table);
840 if (table->flags & NFT_TABLE_INACTIVE)
843 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
845 return PTR_ERR(chain);
846 if (chain->flags & NFT_CHAIN_INACTIVE)
849 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
853 err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid,
854 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
855 family, table, chain);
859 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
866 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
867 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
868 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
871 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
873 struct nlattr *tb[NFTA_COUNTER_MAX+1];
874 struct nft_stats __percpu *newstats;
875 struct nft_stats *stats;
878 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
882 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
883 return ERR_PTR(-EINVAL);
885 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
886 if (newstats == NULL)
887 return ERR_PTR(-ENOMEM);
889 /* Restore old counters on this cpu, no problem. Per-cpu statistics
890 * are not exposed to userspace.
893 stats = this_cpu_ptr(newstats);
894 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
895 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
901 static void nft_chain_stats_replace(struct nft_base_chain *chain,
902 struct nft_stats __percpu *newstats)
904 if (newstats == NULL)
908 struct nft_stats __percpu *oldstats =
909 nft_dereference(chain->stats);
911 rcu_assign_pointer(chain->stats, newstats);
913 free_percpu(oldstats);
915 rcu_assign_pointer(chain->stats, newstats);
918 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
920 struct nft_trans *trans;
922 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
926 if (msg_type == NFT_MSG_NEWCHAIN)
927 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
929 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
933 static void nf_tables_chain_destroy(struct nft_chain *chain)
935 BUG_ON(chain->use > 0);
937 if (chain->flags & NFT_BASE_CHAIN) {
938 module_put(nft_base_chain(chain)->type->owner);
939 free_percpu(nft_base_chain(chain)->stats);
940 kfree(nft_base_chain(chain));
946 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
947 const struct nlmsghdr *nlh,
948 const struct nlattr * const nla[])
950 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
951 const struct nlattr * uninitialized_var(name);
952 struct nft_af_info *afi;
953 struct nft_table *table;
954 struct nft_chain *chain;
955 struct nft_base_chain *basechain = NULL;
956 struct nlattr *ha[NFTA_HOOK_MAX + 1];
957 struct net *net = sock_net(skb->sk);
958 int family = nfmsg->nfgen_family;
959 u8 policy = NF_ACCEPT;
962 struct nft_stats __percpu *stats;
967 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
969 afi = nf_tables_afinfo_lookup(net, family, true);
973 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
975 return PTR_ERR(table);
978 name = nla[NFTA_CHAIN_NAME];
980 if (nla[NFTA_CHAIN_HANDLE]) {
981 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
982 chain = nf_tables_chain_lookup_byhandle(table, handle);
984 return PTR_ERR(chain);
986 chain = nf_tables_chain_lookup(table, name);
988 if (PTR_ERR(chain) != -ENOENT)
989 return PTR_ERR(chain);
994 if (nla[NFTA_CHAIN_POLICY]) {
995 if ((chain != NULL &&
996 !(chain->flags & NFT_BASE_CHAIN)))
1000 nla[NFTA_CHAIN_HOOK] == NULL)
1003 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1013 if (chain != NULL) {
1014 struct nft_stats *stats = NULL;
1015 struct nft_trans *trans;
1017 if (chain->flags & NFT_CHAIN_INACTIVE)
1019 if (nlh->nlmsg_flags & NLM_F_EXCL)
1021 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1024 if (nla[NFTA_CHAIN_HANDLE] && name &&
1025 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1028 if (nla[NFTA_CHAIN_COUNTERS]) {
1029 if (!(chain->flags & NFT_BASE_CHAIN))
1032 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1034 return PTR_ERR(stats);
1037 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1038 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1039 sizeof(struct nft_trans_chain));
1040 if (trans == NULL) {
1045 nft_trans_chain_stats(trans) = stats;
1046 nft_trans_chain_update(trans) = true;
1048 if (nla[NFTA_CHAIN_POLICY])
1049 nft_trans_chain_policy(trans) = policy;
1051 nft_trans_chain_policy(trans) = -1;
1053 if (nla[NFTA_CHAIN_HANDLE] && name) {
1054 nla_strlcpy(nft_trans_chain_name(trans), name,
1055 NFT_CHAIN_MAXNAMELEN);
1057 list_add_tail(&trans->list, &net->nft.commit_list);
1061 if (table->use == UINT_MAX)
1064 if (nla[NFTA_CHAIN_HOOK]) {
1065 const struct nf_chain_type *type;
1066 struct nf_hook_ops *ops;
1068 u32 hooknum, priority;
1070 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1071 if (nla[NFTA_CHAIN_TYPE]) {
1072 type = nf_tables_chain_type_lookup(afi,
1073 nla[NFTA_CHAIN_TYPE],
1076 return PTR_ERR(type);
1079 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1083 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1084 ha[NFTA_HOOK_PRIORITY] == NULL)
1087 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1088 if (hooknum >= afi->nhooks)
1090 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1092 if (!(type->hook_mask & (1 << hooknum)))
1094 if (!try_module_get(type->owner))
1096 hookfn = type->hooks[hooknum];
1098 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1099 if (basechain == NULL) {
1100 module_put(type->owner);
1104 if (nla[NFTA_CHAIN_COUNTERS]) {
1105 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1106 if (IS_ERR(stats)) {
1107 module_put(type->owner);
1109 return PTR_ERR(stats);
1111 basechain->stats = stats;
1113 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1114 if (stats == NULL) {
1115 module_put(type->owner);
1119 rcu_assign_pointer(basechain->stats, stats);
1122 basechain->type = type;
1123 chain = &basechain->chain;
1125 for (i = 0; i < afi->nops; i++) {
1126 ops = &basechain->ops[i];
1128 ops->owner = afi->owner;
1129 ops->hooknum = hooknum;
1130 ops->priority = priority;
1132 ops->hook = afi->hooks[ops->hooknum];
1135 if (afi->hook_ops_init)
1136 afi->hook_ops_init(ops, i);
1139 chain->flags |= NFT_BASE_CHAIN;
1140 basechain->policy = policy;
1142 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1147 INIT_LIST_HEAD(&chain->rules);
1148 chain->handle = nf_tables_alloc_handle(table);
1150 chain->table = table;
1151 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1153 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1154 chain->flags & NFT_BASE_CHAIN) {
1155 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1160 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1161 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1166 list_add_tail_rcu(&chain->list, &table->chains);
1169 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1170 chain->flags & NFT_BASE_CHAIN) {
1171 nf_unregister_hooks(nft_base_chain(chain)->ops,
1175 nf_tables_chain_destroy(chain);
1179 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1180 const struct nlmsghdr *nlh,
1181 const struct nlattr * const nla[])
1183 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1184 struct nft_af_info *afi;
1185 struct nft_table *table;
1186 struct nft_chain *chain;
1187 struct net *net = sock_net(skb->sk);
1188 int family = nfmsg->nfgen_family;
1192 afi = nf_tables_afinfo_lookup(net, family, false);
1194 return PTR_ERR(afi);
1196 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1198 return PTR_ERR(table);
1199 if (table->flags & NFT_TABLE_INACTIVE)
1202 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1204 return PTR_ERR(chain);
1205 if (chain->flags & NFT_CHAIN_INACTIVE)
1210 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1211 err = nft_trans_chain_add(&ctx, NFT_MSG_DELCHAIN);
1216 list_del_rcu(&chain->list);
1225 * nft_register_expr - register nf_tables expr type
1228 * Registers the expr type for use with nf_tables. Returns zero on
1229 * success or a negative errno code otherwise.
1231 int nft_register_expr(struct nft_expr_type *type)
1233 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1234 if (type->family == NFPROTO_UNSPEC)
1235 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1237 list_add_rcu(&type->list, &nf_tables_expressions);
1238 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1241 EXPORT_SYMBOL_GPL(nft_register_expr);
1244 * nft_unregister_expr - unregister nf_tables expr type
1247 * Unregisters the expr typefor use with nf_tables.
1249 void nft_unregister_expr(struct nft_expr_type *type)
1251 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1252 list_del_rcu(&type->list);
1253 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1255 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1257 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1260 const struct nft_expr_type *type;
1262 list_for_each_entry(type, &nf_tables_expressions, list) {
1263 if (!nla_strcmp(nla, type->name) &&
1264 (!type->family || type->family == family))
1270 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1273 const struct nft_expr_type *type;
1276 return ERR_PTR(-EINVAL);
1278 type = __nft_expr_type_get(family, nla);
1279 if (type != NULL && try_module_get(type->owner))
1282 #ifdef CONFIG_MODULES
1284 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1285 request_module("nft-expr-%u-%.*s", family,
1286 nla_len(nla), (char *)nla_data(nla));
1287 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1288 if (__nft_expr_type_get(family, nla))
1289 return ERR_PTR(-EAGAIN);
1291 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1292 request_module("nft-expr-%.*s",
1293 nla_len(nla), (char *)nla_data(nla));
1294 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1295 if (__nft_expr_type_get(family, nla))
1296 return ERR_PTR(-EAGAIN);
1299 return ERR_PTR(-ENOENT);
1302 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1303 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1304 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1307 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1308 const struct nft_expr *expr)
1310 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1311 goto nla_put_failure;
1313 if (expr->ops->dump) {
1314 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1316 goto nla_put_failure;
1317 if (expr->ops->dump(skb, expr) < 0)
1318 goto nla_put_failure;
1319 nla_nest_end(skb, data);
1328 struct nft_expr_info {
1329 const struct nft_expr_ops *ops;
1330 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1333 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1334 const struct nlattr *nla,
1335 struct nft_expr_info *info)
1337 const struct nft_expr_type *type;
1338 const struct nft_expr_ops *ops;
1339 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1342 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1346 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1348 return PTR_ERR(type);
1350 if (tb[NFTA_EXPR_DATA]) {
1351 err = nla_parse_nested(info->tb, type->maxattr,
1352 tb[NFTA_EXPR_DATA], type->policy);
1356 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1358 if (type->select_ops != NULL) {
1359 ops = type->select_ops(ctx,
1360 (const struct nlattr * const *)info->tb);
1372 module_put(type->owner);
1376 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1377 const struct nft_expr_info *info,
1378 struct nft_expr *expr)
1380 const struct nft_expr_ops *ops = info->ops;
1385 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1397 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1398 struct nft_expr *expr)
1400 if (expr->ops->destroy)
1401 expr->ops->destroy(ctx, expr);
1402 module_put(expr->ops->type->owner);
1409 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1412 struct nft_rule *rule;
1414 // FIXME: this sucks
1415 list_for_each_entry(rule, &chain->rules, list) {
1416 if (handle == rule->handle)
1420 return ERR_PTR(-ENOENT);
1423 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1424 const struct nlattr *nla)
1427 return ERR_PTR(-EINVAL);
1429 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1432 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1433 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1434 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1435 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1436 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1437 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1438 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1439 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1440 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1441 .len = NFT_USERDATA_MAXLEN },
1444 static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq,
1445 int event, u32 flags, int family,
1446 const struct nft_table *table,
1447 const struct nft_chain *chain,
1448 const struct nft_rule *rule)
1450 struct nlmsghdr *nlh;
1451 struct nfgenmsg *nfmsg;
1452 const struct nft_expr *expr, *next;
1453 struct nlattr *list;
1454 const struct nft_rule *prule;
1455 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1457 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1460 goto nla_put_failure;
1462 nfmsg = nlmsg_data(nlh);
1463 nfmsg->nfgen_family = family;
1464 nfmsg->version = NFNETLINK_V0;
1467 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1468 goto nla_put_failure;
1469 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1470 goto nla_put_failure;
1471 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1472 goto nla_put_failure;
1474 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1475 prule = list_entry(rule->list.prev, struct nft_rule, list);
1476 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1477 cpu_to_be64(prule->handle)))
1478 goto nla_put_failure;
1481 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1483 goto nla_put_failure;
1484 nft_rule_for_each_expr(expr, next, rule) {
1485 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1487 goto nla_put_failure;
1488 if (nf_tables_fill_expr_info(skb, expr) < 0)
1489 goto nla_put_failure;
1490 nla_nest_end(skb, elem);
1492 nla_nest_end(skb, list);
1495 nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule)))
1496 goto nla_put_failure;
1498 return nlmsg_end(skb, nlh);
1501 nlmsg_trim(skb, nlh);
1505 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1506 const struct nft_rule *rule,
1509 struct sk_buff *skb;
1513 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1517 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1521 err = nf_tables_fill_rule_info(skb, ctx->portid, ctx->seq, event, 0,
1522 ctx->afi->family, ctx->table,
1529 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1530 ctx->report, GFP_KERNEL);
1533 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1540 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
1542 return (rule->genmask & (1 << net->nft.gencursor)) == 0;
1545 static inline int gencursor_next(struct net *net)
1547 return net->nft.gencursor+1 == 1 ? 1 : 0;
1551 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
1553 return (rule->genmask & (1 << gencursor_next(net))) == 0;
1557 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
1559 /* Now inactive, will be active in the future */
1560 rule->genmask = (1 << net->nft.gencursor);
1564 nft_rule_disactivate_next(struct net *net, struct nft_rule *rule)
1566 rule->genmask = (1 << gencursor_next(net));
1569 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
1574 static int nf_tables_dump_rules(struct sk_buff *skb,
1575 struct netlink_callback *cb)
1577 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1578 const struct nft_af_info *afi;
1579 const struct nft_table *table;
1580 const struct nft_chain *chain;
1581 const struct nft_rule *rule;
1582 unsigned int idx = 0, s_idx = cb->args[0];
1583 struct net *net = sock_net(skb->sk);
1584 int family = nfmsg->nfgen_family;
1587 cb->seq = net->nft.base_seq;
1589 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1590 if (family != NFPROTO_UNSPEC && family != afi->family)
1593 list_for_each_entry_rcu(table, &afi->tables, list) {
1594 list_for_each_entry_rcu(chain, &table->chains, list) {
1595 list_for_each_entry_rcu(rule, &chain->rules, list) {
1596 if (!nft_rule_is_active(net, rule))
1601 memset(&cb->args[1], 0,
1602 sizeof(cb->args) - sizeof(cb->args[0]));
1603 if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid,
1606 NLM_F_MULTI | NLM_F_APPEND,
1607 afi->family, table, chain, rule) < 0)
1610 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1624 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1625 const struct nlmsghdr *nlh,
1626 const struct nlattr * const nla[])
1628 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1629 const struct nft_af_info *afi;
1630 const struct nft_table *table;
1631 const struct nft_chain *chain;
1632 const struct nft_rule *rule;
1633 struct sk_buff *skb2;
1634 struct net *net = sock_net(skb->sk);
1635 int family = nfmsg->nfgen_family;
1638 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1639 struct netlink_dump_control c = {
1640 .dump = nf_tables_dump_rules,
1642 return netlink_dump_start(nlsk, skb, nlh, &c);
1645 afi = nf_tables_afinfo_lookup(net, family, false);
1647 return PTR_ERR(afi);
1649 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1651 return PTR_ERR(table);
1652 if (table->flags & NFT_TABLE_INACTIVE)
1655 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1657 return PTR_ERR(chain);
1658 if (chain->flags & NFT_CHAIN_INACTIVE)
1661 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1663 return PTR_ERR(rule);
1665 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1669 err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid,
1670 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1671 family, table, chain, rule);
1675 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1682 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1683 struct nft_rule *rule)
1685 struct nft_expr *expr, *next;
1688 * Careful: some expressions might not be initialized in case this
1689 * is called on error from nf_tables_newrule().
1691 expr = nft_expr_first(rule);
1692 while (expr != nft_expr_last(rule) && expr->ops) {
1693 next = nft_expr_next(expr);
1694 nf_tables_expr_destroy(ctx, expr);
1700 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
1701 struct nft_rule *rule)
1703 struct nft_trans *trans;
1705 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
1709 nft_trans_rule(trans) = rule;
1710 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1715 #define NFT_RULE_MAXEXPRS 128
1717 static struct nft_expr_info *info;
1719 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1720 const struct nlmsghdr *nlh,
1721 const struct nlattr * const nla[])
1723 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1724 struct nft_af_info *afi;
1725 struct net *net = sock_net(skb->sk);
1726 struct nft_table *table;
1727 struct nft_chain *chain;
1728 struct nft_rule *rule, *old_rule = NULL;
1729 struct nft_trans *trans = NULL;
1730 struct nft_expr *expr;
1733 unsigned int size, i, n, ulen = 0;
1736 u64 handle, pos_handle;
1738 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1740 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1742 return PTR_ERR(afi);
1744 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1746 return PTR_ERR(table);
1748 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1750 return PTR_ERR(chain);
1752 if (nla[NFTA_RULE_HANDLE]) {
1753 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1754 rule = __nf_tables_rule_lookup(chain, handle);
1756 return PTR_ERR(rule);
1758 if (nlh->nlmsg_flags & NLM_F_EXCL)
1760 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1765 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1767 handle = nf_tables_alloc_handle(table);
1769 if (chain->use == UINT_MAX)
1772 if (nla[NFTA_RULE_POSITION]) {
1773 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1774 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1775 if (IS_ERR(old_rule))
1776 return PTR_ERR(old_rule);
1780 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1784 if (nla[NFTA_RULE_EXPRESSIONS]) {
1785 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1787 if (nla_type(tmp) != NFTA_LIST_ELEM)
1789 if (n == NFT_RULE_MAXEXPRS)
1791 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1794 size += info[n].ops->size;
1798 /* Check for overflow of dlen field */
1800 if (size >= 1 << 12)
1803 if (nla[NFTA_RULE_USERDATA])
1804 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
1807 rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL);
1811 nft_rule_activate_next(net, rule);
1813 rule->handle = handle;
1818 nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen);
1820 expr = nft_expr_first(rule);
1821 for (i = 0; i < n; i++) {
1822 err = nf_tables_newexpr(&ctx, &info[i], expr);
1826 expr = nft_expr_next(expr);
1829 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
1830 if (!nft_rule_is_active_next(net, old_rule)) {
1834 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
1836 if (trans == NULL) {
1840 nft_rule_disactivate_next(net, old_rule);
1843 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
1848 list_add_tail_rcu(&rule->list, &old_rule->list);
1850 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
1855 if (nlh->nlmsg_flags & NLM_F_APPEND) {
1857 list_add_rcu(&rule->list, &old_rule->list);
1859 list_add_tail_rcu(&rule->list, &chain->rules);
1862 list_add_tail_rcu(&rule->list, &old_rule->list);
1864 list_add_rcu(&rule->list, &chain->rules);
1871 nf_tables_rule_destroy(&ctx, rule);
1873 for (i = 0; i < n; i++) {
1874 if (info[i].ops != NULL)
1875 module_put(info[i].ops->type->owner);
1881 nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule)
1883 /* You cannot delete the same rule twice */
1884 if (nft_rule_is_active_next(ctx->net, rule)) {
1885 if (nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule) == NULL)
1887 nft_rule_disactivate_next(ctx->net, rule);
1894 static int nf_table_delrule_by_chain(struct nft_ctx *ctx)
1896 struct nft_rule *rule;
1899 list_for_each_entry(rule, &ctx->chain->rules, list) {
1900 if (!nft_rule_is_active_next(ctx->net, rule))
1903 err = nf_tables_delrule_one(ctx, rule);
1910 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
1911 const struct nlmsghdr *nlh,
1912 const struct nlattr * const nla[])
1914 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1915 struct nft_af_info *afi;
1916 struct net *net = sock_net(skb->sk);
1917 struct nft_table *table;
1918 struct nft_chain *chain = NULL;
1919 struct nft_rule *rule;
1920 int family = nfmsg->nfgen_family, err = 0;
1923 afi = nf_tables_afinfo_lookup(net, family, false);
1925 return PTR_ERR(afi);
1927 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1929 return PTR_ERR(table);
1930 if (table->flags & NFT_TABLE_INACTIVE)
1933 if (nla[NFTA_RULE_CHAIN]) {
1934 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1936 return PTR_ERR(chain);
1939 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1942 if (nla[NFTA_RULE_HANDLE]) {
1943 rule = nf_tables_rule_lookup(chain,
1944 nla[NFTA_RULE_HANDLE]);
1946 return PTR_ERR(rule);
1948 err = nf_tables_delrule_one(&ctx, rule);
1950 err = nf_table_delrule_by_chain(&ctx);
1953 list_for_each_entry(chain, &table->chains, list) {
1955 err = nf_table_delrule_by_chain(&ctx);
1968 static LIST_HEAD(nf_tables_set_ops);
1970 int nft_register_set(struct nft_set_ops *ops)
1972 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1973 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
1974 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1977 EXPORT_SYMBOL_GPL(nft_register_set);
1979 void nft_unregister_set(struct nft_set_ops *ops)
1981 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1982 list_del_rcu(&ops->list);
1983 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1985 EXPORT_SYMBOL_GPL(nft_unregister_set);
1988 * Select a set implementation based on the data characteristics and the
1989 * given policy. The total memory use might not be known if no size is
1990 * given, in that case the amount of memory per element is used.
1992 static const struct nft_set_ops *
1993 nft_select_set_ops(const struct nlattr * const nla[],
1994 const struct nft_set_desc *desc,
1995 enum nft_set_policies policy)
1997 const struct nft_set_ops *ops, *bops;
1998 struct nft_set_estimate est, best;
2001 #ifdef CONFIG_MODULES
2002 if (list_empty(&nf_tables_set_ops)) {
2003 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2004 request_module("nft-set");
2005 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2006 if (!list_empty(&nf_tables_set_ops))
2007 return ERR_PTR(-EAGAIN);
2011 if (nla[NFTA_SET_FLAGS] != NULL) {
2012 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2013 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
2020 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2021 if ((ops->features & features) != features)
2023 if (!ops->estimate(desc, features, &est))
2027 case NFT_SET_POL_PERFORMANCE:
2028 if (est.class < best.class)
2030 if (est.class == best.class && est.size < best.size)
2033 case NFT_SET_POL_MEMORY:
2034 if (est.size < best.size)
2036 if (est.size == best.size && est.class < best.class)
2043 if (!try_module_get(ops->owner))
2046 module_put(bops->owner);
2055 return ERR_PTR(-EOPNOTSUPP);
2058 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2059 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2060 [NFTA_SET_NAME] = { .type = NLA_STRING,
2061 .len = IFNAMSIZ - 1 },
2062 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2063 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2064 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2065 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2066 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2067 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2068 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2069 [NFTA_SET_ID] = { .type = NLA_U32 },
2072 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2073 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2076 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2077 const struct sk_buff *skb,
2078 const struct nlmsghdr *nlh,
2079 const struct nlattr * const nla[])
2081 struct net *net = sock_net(skb->sk);
2082 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2083 struct nft_af_info *afi = NULL;
2084 struct nft_table *table = NULL;
2086 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2087 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2089 return PTR_ERR(afi);
2092 if (nla[NFTA_SET_TABLE] != NULL) {
2094 return -EAFNOSUPPORT;
2096 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2098 return PTR_ERR(table);
2099 if (table->flags & NFT_TABLE_INACTIVE)
2103 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2107 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2108 const struct nlattr *nla)
2110 struct nft_set *set;
2113 return ERR_PTR(-EINVAL);
2115 list_for_each_entry(set, &table->sets, list) {
2116 if (!nla_strcmp(nla, set->name))
2119 return ERR_PTR(-ENOENT);
2122 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2123 const struct nlattr *nla)
2125 struct nft_trans *trans;
2126 u32 id = ntohl(nla_get_be32(nla));
2128 list_for_each_entry(trans, &net->nft.commit_list, list) {
2129 if (trans->msg_type == NFT_MSG_NEWSET &&
2130 id == nft_trans_set_id(trans))
2131 return nft_trans_set(trans);
2133 return ERR_PTR(-ENOENT);
2136 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2139 const struct nft_set *i;
2141 unsigned long *inuse;
2142 unsigned int n = 0, min = 0;
2144 p = strnchr(name, IFNAMSIZ, '%');
2146 if (p[1] != 'd' || strchr(p + 2, '%'))
2149 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2153 list_for_each_entry(i, &ctx->table->sets, list) {
2156 if (!sscanf(i->name, name, &tmp))
2158 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2161 set_bit(tmp - min, inuse);
2164 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2165 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2166 min += BITS_PER_BYTE * PAGE_SIZE;
2167 memset(inuse, 0, PAGE_SIZE);
2170 free_page((unsigned long)inuse);
2173 snprintf(set->name, sizeof(set->name), name, min + n);
2174 list_for_each_entry(i, &ctx->table->sets, list) {
2175 if (!strcmp(set->name, i->name))
2181 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2182 const struct nft_set *set, u16 event, u16 flags)
2184 struct nfgenmsg *nfmsg;
2185 struct nlmsghdr *nlh;
2186 struct nlattr *desc;
2187 u32 portid = ctx->portid;
2190 event |= NFNL_SUBSYS_NFTABLES << 8;
2191 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2194 goto nla_put_failure;
2196 nfmsg = nlmsg_data(nlh);
2197 nfmsg->nfgen_family = ctx->afi->family;
2198 nfmsg->version = NFNETLINK_V0;
2201 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2202 goto nla_put_failure;
2203 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2204 goto nla_put_failure;
2205 if (set->flags != 0)
2206 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2207 goto nla_put_failure;
2209 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2210 goto nla_put_failure;
2211 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2212 goto nla_put_failure;
2213 if (set->flags & NFT_SET_MAP) {
2214 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2215 goto nla_put_failure;
2216 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2217 goto nla_put_failure;
2220 desc = nla_nest_start(skb, NFTA_SET_DESC);
2222 goto nla_put_failure;
2224 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2225 goto nla_put_failure;
2226 nla_nest_end(skb, desc);
2228 return nlmsg_end(skb, nlh);
2231 nlmsg_trim(skb, nlh);
2235 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2236 const struct nft_set *set,
2237 int event, gfp_t gfp_flags)
2239 struct sk_buff *skb;
2240 u32 portid = ctx->portid;
2244 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2248 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2252 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2258 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2259 ctx->report, gfp_flags);
2262 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2266 static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb,
2267 struct netlink_callback *cb)
2269 const struct nft_set *set;
2270 unsigned int idx = 0, s_idx = cb->args[0];
2276 cb->seq = ctx->net->nft.base_seq;
2278 list_for_each_entry_rcu(set, &ctx->table->sets, list) {
2281 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2286 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2296 static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb,
2297 struct netlink_callback *cb)
2299 const struct nft_set *set;
2300 unsigned int idx, s_idx = cb->args[0];
2301 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2307 cb->seq = ctx->net->nft.base_seq;
2309 list_for_each_entry_rcu(table, &ctx->afi->tables, list) {
2311 if (cur_table != table)
2318 list_for_each_entry_rcu(set, &ctx->table->sets, list) {
2321 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2324 cb->args[2] = (unsigned long) table;
2327 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2338 static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb,
2339 struct netlink_callback *cb)
2341 const struct nft_set *set;
2342 unsigned int idx, s_idx = cb->args[0];
2343 struct nft_af_info *afi;
2344 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2345 struct net *net = sock_net(skb->sk);
2346 int cur_family = cb->args[3];
2352 cb->seq = net->nft.base_seq;
2354 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2356 if (afi->family != cur_family)
2362 list_for_each_entry_rcu(table, &afi->tables, list) {
2364 if (cur_table != table)
2373 list_for_each_entry_rcu(set, &ctx->table->sets, list) {
2376 if (nf_tables_fill_set(skb, ctx, set,
2380 cb->args[2] = (unsigned long) table;
2381 cb->args[3] = afi->family;
2384 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2398 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2400 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2401 struct nlattr *nla[NFTA_SET_MAX + 1];
2405 err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX,
2410 err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla);
2414 if (ctx.table == NULL) {
2415 if (ctx.afi == NULL)
2416 ret = nf_tables_dump_sets_all(&ctx, skb, cb);
2418 ret = nf_tables_dump_sets_family(&ctx, skb, cb);
2420 ret = nf_tables_dump_sets_table(&ctx, skb, cb);
2425 #define NFT_SET_INACTIVE (1 << 15) /* Internal set flag */
2427 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2428 const struct nlmsghdr *nlh,
2429 const struct nlattr * const nla[])
2431 const struct nft_set *set;
2433 struct sk_buff *skb2;
2434 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2437 /* Verify existance before starting dump */
2438 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2442 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2443 struct netlink_dump_control c = {
2444 .dump = nf_tables_dump_sets,
2446 return netlink_dump_start(nlsk, skb, nlh, &c);
2449 /* Only accept unspec with dump */
2450 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2451 return -EAFNOSUPPORT;
2453 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2455 return PTR_ERR(set);
2456 if (set->flags & NFT_SET_INACTIVE)
2459 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2463 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2467 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2474 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2475 struct nft_set_desc *desc,
2476 const struct nlattr *nla)
2478 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2481 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2485 if (da[NFTA_SET_DESC_SIZE] != NULL)
2486 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2491 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
2492 struct nft_set *set)
2494 struct nft_trans *trans;
2496 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
2500 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
2501 nft_trans_set_id(trans) =
2502 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
2503 set->flags |= NFT_SET_INACTIVE;
2505 nft_trans_set(trans) = set;
2506 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2511 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2512 const struct nlmsghdr *nlh,
2513 const struct nlattr * const nla[])
2515 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2516 const struct nft_set_ops *ops;
2517 struct nft_af_info *afi;
2518 struct net *net = sock_net(skb->sk);
2519 struct nft_table *table;
2520 struct nft_set *set;
2522 char name[IFNAMSIZ];
2525 u32 ktype, dtype, flags, policy;
2526 struct nft_set_desc desc;
2529 if (nla[NFTA_SET_TABLE] == NULL ||
2530 nla[NFTA_SET_NAME] == NULL ||
2531 nla[NFTA_SET_KEY_LEN] == NULL ||
2532 nla[NFTA_SET_ID] == NULL)
2535 memset(&desc, 0, sizeof(desc));
2537 ktype = NFT_DATA_VALUE;
2538 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2539 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2540 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2544 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2545 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2549 if (nla[NFTA_SET_FLAGS] != NULL) {
2550 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2551 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2552 NFT_SET_INTERVAL | NFT_SET_MAP))
2557 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2558 if (!(flags & NFT_SET_MAP))
2561 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2562 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2563 dtype != NFT_DATA_VERDICT)
2566 if (dtype != NFT_DATA_VERDICT) {
2567 if (nla[NFTA_SET_DATA_LEN] == NULL)
2569 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2570 if (desc.dlen == 0 ||
2571 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2574 desc.dlen = sizeof(struct nft_data);
2575 } else if (flags & NFT_SET_MAP)
2578 policy = NFT_SET_POL_PERFORMANCE;
2579 if (nla[NFTA_SET_POLICY] != NULL)
2580 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2582 if (nla[NFTA_SET_DESC] != NULL) {
2583 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2588 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2590 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2592 return PTR_ERR(afi);
2594 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2596 return PTR_ERR(table);
2598 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2600 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2602 if (PTR_ERR(set) != -ENOENT)
2603 return PTR_ERR(set);
2608 if (nlh->nlmsg_flags & NLM_F_EXCL)
2610 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2615 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2618 ops = nft_select_set_ops(nla, &desc, policy);
2620 return PTR_ERR(ops);
2623 if (ops->privsize != NULL)
2624 size = ops->privsize(nla);
2627 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2631 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2632 err = nf_tables_set_alloc_name(&ctx, set, name);
2636 INIT_LIST_HEAD(&set->bindings);
2639 set->klen = desc.klen;
2641 set->dlen = desc.dlen;
2643 set->size = desc.size;
2645 err = ops->init(set, &desc, nla);
2649 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2653 list_add_tail_rcu(&set->list, &table->sets);
2662 module_put(ops->owner);
2666 static void nft_set_destroy(struct nft_set *set)
2668 set->ops->destroy(set);
2669 module_put(set->ops->owner);
2673 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2675 list_del_rcu(&set->list);
2676 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2677 nft_set_destroy(set);
2680 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2681 const struct nlmsghdr *nlh,
2682 const struct nlattr * const nla[])
2684 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2685 struct nft_set *set;
2689 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2690 return -EAFNOSUPPORT;
2691 if (nla[NFTA_SET_TABLE] == NULL)
2694 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2698 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2700 return PTR_ERR(set);
2701 if (set->flags & NFT_SET_INACTIVE)
2703 if (!list_empty(&set->bindings))
2706 err = nft_trans_set_add(&ctx, NFT_MSG_DELSET, set);
2710 list_del_rcu(&set->list);
2715 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2716 const struct nft_set *set,
2717 const struct nft_set_iter *iter,
2718 const struct nft_set_elem *elem)
2720 enum nft_registers dreg;
2722 dreg = nft_type_to_reg(set->dtype);
2723 return nft_validate_data_load(ctx, dreg, &elem->data,
2724 set->dtype == NFT_DATA_VERDICT ?
2725 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2728 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2729 struct nft_set_binding *binding)
2731 struct nft_set_binding *i;
2732 struct nft_set_iter iter;
2734 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2737 if (set->flags & NFT_SET_MAP) {
2738 /* If the set is already bound to the same chain all
2739 * jumps are already validated for that chain.
2741 list_for_each_entry(i, &set->bindings, list) {
2742 if (i->chain == binding->chain)
2749 iter.fn = nf_tables_bind_check_setelem;
2751 set->ops->walk(ctx, set, &iter);
2753 /* Destroy anonymous sets if binding fails */
2754 if (set->flags & NFT_SET_ANONYMOUS)
2755 nf_tables_set_destroy(ctx, set);
2761 binding->chain = ctx->chain;
2762 list_add_tail_rcu(&binding->list, &set->bindings);
2766 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2767 struct nft_set_binding *binding)
2769 list_del_rcu(&binding->list);
2771 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2772 !(set->flags & NFT_SET_INACTIVE))
2773 nf_tables_set_destroy(ctx, set);
2780 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2781 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2782 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2783 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2786 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2787 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2788 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2789 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2790 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2793 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2794 const struct sk_buff *skb,
2795 const struct nlmsghdr *nlh,
2796 const struct nlattr * const nla[],
2799 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2800 struct nft_af_info *afi;
2801 struct nft_table *table;
2802 struct net *net = sock_net(skb->sk);
2804 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2806 return PTR_ERR(afi);
2808 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2810 return PTR_ERR(table);
2811 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2814 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2818 static int nf_tables_fill_setelem(struct sk_buff *skb,
2819 const struct nft_set *set,
2820 const struct nft_set_elem *elem)
2822 unsigned char *b = skb_tail_pointer(skb);
2823 struct nlattr *nest;
2825 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2827 goto nla_put_failure;
2829 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2831 goto nla_put_failure;
2833 if (set->flags & NFT_SET_MAP &&
2834 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2835 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2836 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2838 goto nla_put_failure;
2840 if (elem->flags != 0)
2841 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2842 goto nla_put_failure;
2844 nla_nest_end(skb, nest);
2852 struct nft_set_dump_args {
2853 const struct netlink_callback *cb;
2854 struct nft_set_iter iter;
2855 struct sk_buff *skb;
2858 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2859 const struct nft_set *set,
2860 const struct nft_set_iter *iter,
2861 const struct nft_set_elem *elem)
2863 struct nft_set_dump_args *args;
2865 args = container_of(iter, struct nft_set_dump_args, iter);
2866 return nf_tables_fill_setelem(args->skb, set, elem);
2869 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2871 const struct nft_set *set;
2872 struct nft_set_dump_args args;
2874 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2875 struct nfgenmsg *nfmsg;
2876 struct nlmsghdr *nlh;
2877 struct nlattr *nest;
2881 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2882 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2886 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
2891 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2893 return PTR_ERR(set);
2894 if (set->flags & NFT_SET_INACTIVE)
2897 event = NFT_MSG_NEWSETELEM;
2898 event |= NFNL_SUBSYS_NFTABLES << 8;
2899 portid = NETLINK_CB(cb->skb).portid;
2900 seq = cb->nlh->nlmsg_seq;
2902 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2905 goto nla_put_failure;
2907 nfmsg = nlmsg_data(nlh);
2908 nfmsg->nfgen_family = ctx.afi->family;
2909 nfmsg->version = NFNETLINK_V0;
2912 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2913 goto nla_put_failure;
2914 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2915 goto nla_put_failure;
2917 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2919 goto nla_put_failure;
2923 args.iter.skip = cb->args[0];
2924 args.iter.count = 0;
2926 args.iter.fn = nf_tables_dump_setelem;
2927 set->ops->walk(&ctx, set, &args.iter);
2929 nla_nest_end(skb, nest);
2930 nlmsg_end(skb, nlh);
2932 if (args.iter.err && args.iter.err != -EMSGSIZE)
2933 return args.iter.err;
2934 if (args.iter.count == cb->args[0])
2937 cb->args[0] = args.iter.count;
2944 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2945 const struct nlmsghdr *nlh,
2946 const struct nlattr * const nla[])
2948 const struct nft_set *set;
2952 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
2956 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2958 return PTR_ERR(set);
2959 if (set->flags & NFT_SET_INACTIVE)
2962 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2963 struct netlink_dump_control c = {
2964 .dump = nf_tables_dump_set,
2966 return netlink_dump_start(nlsk, skb, nlh, &c);
2971 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
2972 const struct nft_ctx *ctx, u32 seq,
2973 u32 portid, int event, u16 flags,
2974 const struct nft_set *set,
2975 const struct nft_set_elem *elem)
2977 struct nfgenmsg *nfmsg;
2978 struct nlmsghdr *nlh;
2979 struct nlattr *nest;
2982 event |= NFNL_SUBSYS_NFTABLES << 8;
2983 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2986 goto nla_put_failure;
2988 nfmsg = nlmsg_data(nlh);
2989 nfmsg->nfgen_family = ctx->afi->family;
2990 nfmsg->version = NFNETLINK_V0;
2993 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2994 goto nla_put_failure;
2995 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2996 goto nla_put_failure;
2998 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3000 goto nla_put_failure;
3002 err = nf_tables_fill_setelem(skb, set, elem);
3004 goto nla_put_failure;
3006 nla_nest_end(skb, nest);
3008 return nlmsg_end(skb, nlh);
3011 nlmsg_trim(skb, nlh);
3015 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3016 const struct nft_set *set,
3017 const struct nft_set_elem *elem,
3018 int event, u16 flags)
3020 struct net *net = ctx->net;
3021 u32 portid = ctx->portid;
3022 struct sk_buff *skb;
3025 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3029 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3033 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3040 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3044 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3048 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3050 struct nft_set *set)
3052 struct nft_trans *trans;
3054 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3058 nft_trans_elem_set(trans) = set;
3062 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3063 const struct nlattr *attr)
3065 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3066 struct nft_data_desc d1, d2;
3067 struct nft_set_elem elem;
3068 struct nft_set_binding *binding;
3069 enum nft_registers dreg;
3070 struct nft_trans *trans;
3073 if (set->size && set->nelems == set->size)
3076 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3077 nft_set_elem_policy);
3081 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3085 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3086 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3087 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
3091 if (set->flags & NFT_SET_MAP) {
3092 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3093 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
3095 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3096 elem.flags & NFT_SET_ELEM_INTERVAL_END)
3099 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3103 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3107 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3111 if (set->ops->get(set, &elem) == 0)
3114 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3115 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
3120 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3123 dreg = nft_type_to_reg(set->dtype);
3124 list_for_each_entry(binding, &set->bindings, list) {
3125 struct nft_ctx bind_ctx = {
3127 .table = ctx->table,
3128 .chain = (struct nft_chain *)binding->chain,
3131 err = nft_validate_data_load(&bind_ctx, dreg,
3132 &elem.data, d2.type);
3138 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3142 err = set->ops->insert(set, &elem);
3146 nft_trans_elem(trans) = elem;
3147 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3153 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3154 nft_data_uninit(&elem.data, d2.type);
3156 nft_data_uninit(&elem.key, d1.type);
3161 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3162 const struct nlmsghdr *nlh,
3163 const struct nlattr * const nla[])
3165 struct net *net = sock_net(skb->sk);
3166 const struct nlattr *attr;
3167 struct nft_set *set;
3171 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3175 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3177 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3178 set = nf_tables_set_lookup_byid(net,
3179 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3182 return PTR_ERR(set);
3185 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3188 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3189 err = nft_add_set_elem(&ctx, set, attr);
3198 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3199 const struct nlattr *attr)
3201 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3202 struct nft_data_desc desc;
3203 struct nft_set_elem elem;
3204 struct nft_trans *trans;
3207 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3208 nft_set_elem_policy);
3213 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3216 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3221 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3224 err = set->ops->get(set, &elem);
3228 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3232 nft_trans_elem(trans) = elem;
3233 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3235 nft_data_uninit(&elem.key, NFT_DATA_VALUE);
3236 if (set->flags & NFT_SET_MAP)
3237 nft_data_uninit(&elem.data, set->dtype);
3240 nft_data_uninit(&elem.key, desc.type);
3245 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3246 const struct nlmsghdr *nlh,
3247 const struct nlattr * const nla[])
3249 const struct nlattr *attr;
3250 struct nft_set *set;
3254 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3258 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3260 return PTR_ERR(set);
3261 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3264 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3265 err = nft_del_setelem(&ctx, set, attr);
3274 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3275 [NFT_MSG_NEWTABLE] = {
3276 .call_batch = nf_tables_newtable,
3277 .attr_count = NFTA_TABLE_MAX,
3278 .policy = nft_table_policy,
3280 [NFT_MSG_GETTABLE] = {
3281 .call = nf_tables_gettable,
3282 .attr_count = NFTA_TABLE_MAX,
3283 .policy = nft_table_policy,
3285 [NFT_MSG_DELTABLE] = {
3286 .call_batch = nf_tables_deltable,
3287 .attr_count = NFTA_TABLE_MAX,
3288 .policy = nft_table_policy,
3290 [NFT_MSG_NEWCHAIN] = {
3291 .call_batch = nf_tables_newchain,
3292 .attr_count = NFTA_CHAIN_MAX,
3293 .policy = nft_chain_policy,
3295 [NFT_MSG_GETCHAIN] = {
3296 .call = nf_tables_getchain,
3297 .attr_count = NFTA_CHAIN_MAX,
3298 .policy = nft_chain_policy,
3300 [NFT_MSG_DELCHAIN] = {
3301 .call_batch = nf_tables_delchain,
3302 .attr_count = NFTA_CHAIN_MAX,
3303 .policy = nft_chain_policy,
3305 [NFT_MSG_NEWRULE] = {
3306 .call_batch = nf_tables_newrule,
3307 .attr_count = NFTA_RULE_MAX,
3308 .policy = nft_rule_policy,
3310 [NFT_MSG_GETRULE] = {
3311 .call = nf_tables_getrule,
3312 .attr_count = NFTA_RULE_MAX,
3313 .policy = nft_rule_policy,
3315 [NFT_MSG_DELRULE] = {
3316 .call_batch = nf_tables_delrule,
3317 .attr_count = NFTA_RULE_MAX,
3318 .policy = nft_rule_policy,
3320 [NFT_MSG_NEWSET] = {
3321 .call_batch = nf_tables_newset,
3322 .attr_count = NFTA_SET_MAX,
3323 .policy = nft_set_policy,
3325 [NFT_MSG_GETSET] = {
3326 .call = nf_tables_getset,
3327 .attr_count = NFTA_SET_MAX,
3328 .policy = nft_set_policy,
3330 [NFT_MSG_DELSET] = {
3331 .call_batch = nf_tables_delset,
3332 .attr_count = NFTA_SET_MAX,
3333 .policy = nft_set_policy,
3335 [NFT_MSG_NEWSETELEM] = {
3336 .call_batch = nf_tables_newsetelem,
3337 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3338 .policy = nft_set_elem_list_policy,
3340 [NFT_MSG_GETSETELEM] = {
3341 .call = nf_tables_getsetelem,
3342 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3343 .policy = nft_set_elem_list_policy,
3345 [NFT_MSG_DELSETELEM] = {
3346 .call_batch = nf_tables_delsetelem,
3347 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3348 .policy = nft_set_elem_list_policy,
3352 static void nft_chain_commit_update(struct nft_trans *trans)
3354 struct nft_base_chain *basechain;
3356 if (nft_trans_chain_name(trans)[0])
3357 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3359 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3362 basechain = nft_base_chain(trans->ctx.chain);
3363 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3365 switch (nft_trans_chain_policy(trans)) {
3368 basechain->policy = nft_trans_chain_policy(trans);
3373 /* Schedule objects for release via rcu to make sure no packets are accesing
3376 static void nf_tables_commit_release_rcu(struct rcu_head *rt)
3378 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3380 switch (trans->msg_type) {
3381 case NFT_MSG_DELTABLE:
3382 nf_tables_table_destroy(&trans->ctx);
3384 case NFT_MSG_DELCHAIN:
3385 nf_tables_chain_destroy(trans->ctx.chain);
3387 case NFT_MSG_DELRULE:
3388 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3390 case NFT_MSG_DELSET:
3391 nft_set_destroy(nft_trans_set(trans));
3397 static int nf_tables_commit(struct sk_buff *skb)
3399 struct net *net = sock_net(skb->sk);
3400 struct nft_trans *trans, *next;
3401 struct nft_set *set;
3403 /* Bump generation counter, invalidate any dump in progress */
3404 while (++net->nft.base_seq == 0);
3406 /* A new generation has just started */
3407 net->nft.gencursor = gencursor_next(net);
3409 /* Make sure all packets have left the previous generation before
3410 * purging old rules.
3414 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3415 switch (trans->msg_type) {
3416 case NFT_MSG_NEWTABLE:
3417 if (nft_trans_table_update(trans)) {
3418 if (!nft_trans_table_enable(trans)) {
3419 nf_tables_table_disable(trans->ctx.afi,
3421 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3424 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3426 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3427 nft_trans_destroy(trans);
3429 case NFT_MSG_DELTABLE:
3430 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3432 case NFT_MSG_NEWCHAIN:
3433 if (nft_trans_chain_update(trans))
3434 nft_chain_commit_update(trans);
3436 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3438 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3439 nft_trans_destroy(trans);
3441 case NFT_MSG_DELCHAIN:
3442 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3443 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) &&
3444 trans->ctx.chain->flags & NFT_BASE_CHAIN) {
3445 nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops,
3446 trans->ctx.afi->nops);
3449 case NFT_MSG_NEWRULE:
3450 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3451 nf_tables_rule_notify(&trans->ctx,
3452 nft_trans_rule(trans),
3454 nft_trans_destroy(trans);
3456 case NFT_MSG_DELRULE:
3457 list_del_rcu(&nft_trans_rule(trans)->list);
3458 nf_tables_rule_notify(&trans->ctx,
3459 nft_trans_rule(trans),
3462 case NFT_MSG_NEWSET:
3463 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3464 /* This avoids hitting -EBUSY when deleting the table
3465 * from the transaction.
3467 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3468 !list_empty(&nft_trans_set(trans)->bindings))
3469 trans->ctx.table->use--;
3471 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3472 NFT_MSG_NEWSET, GFP_KERNEL);
3473 nft_trans_destroy(trans);
3475 case NFT_MSG_DELSET:
3476 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3477 NFT_MSG_DELSET, GFP_KERNEL);
3479 case NFT_MSG_NEWSETELEM:
3480 nf_tables_setelem_notify(&trans->ctx,
3481 nft_trans_elem_set(trans),
3482 &nft_trans_elem(trans),
3483 NFT_MSG_NEWSETELEM, 0);
3484 nft_trans_destroy(trans);
3486 case NFT_MSG_DELSETELEM:
3487 nf_tables_setelem_notify(&trans->ctx,
3488 nft_trans_elem_set(trans),
3489 &nft_trans_elem(trans),
3490 NFT_MSG_DELSETELEM, 0);
3491 set = nft_trans_elem_set(trans);
3492 set->ops->get(set, &nft_trans_elem(trans));
3493 set->ops->remove(set, &nft_trans_elem(trans));
3494 nft_trans_destroy(trans);
3499 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3500 list_del(&trans->list);
3501 trans->ctx.nla = NULL;
3502 call_rcu(&trans->rcu_head, nf_tables_commit_release_rcu);
3508 /* Schedule objects for release via rcu to make sure no packets are accesing
3511 static void nf_tables_abort_release_rcu(struct rcu_head *rt)
3513 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3515 switch (trans->msg_type) {
3516 case NFT_MSG_NEWTABLE:
3517 nf_tables_table_destroy(&trans->ctx);
3519 case NFT_MSG_NEWCHAIN:
3520 nf_tables_chain_destroy(trans->ctx.chain);
3522 case NFT_MSG_NEWRULE:
3523 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3525 case NFT_MSG_NEWSET:
3526 nft_set_destroy(nft_trans_set(trans));
3532 static int nf_tables_abort(struct sk_buff *skb)
3534 struct net *net = sock_net(skb->sk);
3535 struct nft_trans *trans, *next;
3536 struct nft_set *set;
3538 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3539 switch (trans->msg_type) {
3540 case NFT_MSG_NEWTABLE:
3541 if (nft_trans_table_update(trans)) {
3542 if (nft_trans_table_enable(trans)) {
3543 nf_tables_table_disable(trans->ctx.afi,
3545 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3547 nft_trans_destroy(trans);
3549 list_del_rcu(&trans->ctx.table->list);
3552 case NFT_MSG_DELTABLE:
3553 list_add_tail_rcu(&trans->ctx.table->list,
3554 &trans->ctx.afi->tables);
3555 nft_trans_destroy(trans);
3557 case NFT_MSG_NEWCHAIN:
3558 if (nft_trans_chain_update(trans)) {
3559 if (nft_trans_chain_stats(trans))
3560 free_percpu(nft_trans_chain_stats(trans));
3562 nft_trans_destroy(trans);
3564 trans->ctx.table->use--;
3565 list_del_rcu(&trans->ctx.chain->list);
3566 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) &&
3567 trans->ctx.chain->flags & NFT_BASE_CHAIN) {
3568 nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops,
3569 trans->ctx.afi->nops);
3573 case NFT_MSG_DELCHAIN:
3574 trans->ctx.table->use++;
3575 list_add_tail_rcu(&trans->ctx.chain->list,
3576 &trans->ctx.table->chains);
3577 nft_trans_destroy(trans);
3579 case NFT_MSG_NEWRULE:
3580 trans->ctx.chain->use--;
3581 list_del_rcu(&nft_trans_rule(trans)->list);
3583 case NFT_MSG_DELRULE:
3584 trans->ctx.chain->use++;
3585 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3586 nft_trans_destroy(trans);
3588 case NFT_MSG_NEWSET:
3589 trans->ctx.table->use--;
3590 list_del_rcu(&nft_trans_set(trans)->list);
3592 case NFT_MSG_DELSET:
3593 trans->ctx.table->use++;
3594 list_add_tail_rcu(&nft_trans_set(trans)->list,
3595 &trans->ctx.table->sets);
3596 nft_trans_destroy(trans);
3598 case NFT_MSG_NEWSETELEM:
3599 nft_trans_elem_set(trans)->nelems--;
3600 set = nft_trans_elem_set(trans);
3601 set->ops->get(set, &nft_trans_elem(trans));
3602 set->ops->remove(set, &nft_trans_elem(trans));
3603 nft_trans_destroy(trans);
3605 case NFT_MSG_DELSETELEM:
3606 nft_trans_elem_set(trans)->nelems++;
3607 nft_trans_destroy(trans);
3612 list_for_each_entry_safe_reverse(trans, next,
3613 &net->nft.commit_list, list) {
3614 list_del(&trans->list);
3615 trans->ctx.nla = NULL;
3616 call_rcu(&trans->rcu_head, nf_tables_abort_release_rcu);
3622 static const struct nfnetlink_subsystem nf_tables_subsys = {
3623 .name = "nf_tables",
3624 .subsys_id = NFNL_SUBSYS_NFTABLES,
3625 .cb_count = NFT_MSG_MAX,
3627 .commit = nf_tables_commit,
3628 .abort = nf_tables_abort,
3632 * Loop detection - walk through the ruleset beginning at the destination chain
3633 * of a new jump until either the source chain is reached (loop) or all
3634 * reachable chains have been traversed.
3636 * The loop check is performed whenever a new jump verdict is added to an
3637 * expression or verdict map or a verdict map is bound to a new chain.
3640 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3641 const struct nft_chain *chain);
3643 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3644 const struct nft_set *set,
3645 const struct nft_set_iter *iter,
3646 const struct nft_set_elem *elem)
3648 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3651 switch (elem->data.verdict) {
3654 return nf_tables_check_loops(ctx, elem->data.chain);
3660 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3661 const struct nft_chain *chain)
3663 const struct nft_rule *rule;
3664 const struct nft_expr *expr, *last;
3665 const struct nft_set *set;
3666 struct nft_set_binding *binding;
3667 struct nft_set_iter iter;
3669 if (ctx->chain == chain)
3672 list_for_each_entry(rule, &chain->rules, list) {
3673 nft_rule_for_each_expr(expr, last, rule) {
3674 const struct nft_data *data = NULL;
3677 if (!expr->ops->validate)
3680 err = expr->ops->validate(ctx, expr, &data);
3687 switch (data->verdict) {
3690 err = nf_tables_check_loops(ctx, data->chain);
3699 list_for_each_entry(set, &ctx->table->sets, list) {
3700 if (!(set->flags & NFT_SET_MAP) ||
3701 set->dtype != NFT_DATA_VERDICT)
3704 list_for_each_entry(binding, &set->bindings, list) {
3705 if (binding->chain != chain)
3711 iter.fn = nf_tables_loop_check_setelem;
3713 set->ops->walk(ctx, set, &iter);
3723 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
3725 * @attr: netlink attribute to fetch value from
3726 * @max: maximum value to be stored in dest
3727 * @dest: pointer to the variable
3729 * Parse, check and store a given u32 netlink attribute into variable.
3730 * This function returns -ERANGE if the value goes over maximum value.
3731 * Otherwise a 0 is returned and the attribute value is stored in the
3732 * destination variable.
3734 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
3738 val = ntohl(nla_get_be32(attr));
3745 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
3748 * nft_validate_input_register - validate an expressions' input register
3750 * @reg: the register number
3752 * Validate that the input register is one of the general purpose
3755 int nft_validate_input_register(enum nft_registers reg)
3757 if (reg <= NFT_REG_VERDICT)
3759 if (reg > NFT_REG_MAX)
3763 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3766 * nft_validate_output_register - validate an expressions' output register
3768 * @reg: the register number
3770 * Validate that the output register is one of the general purpose
3771 * registers or the verdict register.
3773 int nft_validate_output_register(enum nft_registers reg)
3775 if (reg < NFT_REG_VERDICT)
3777 if (reg > NFT_REG_MAX)
3781 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3784 * nft_validate_data_load - validate an expressions' data load
3786 * @ctx: context of the expression performing the load
3787 * @reg: the destination register number
3788 * @data: the data to load
3789 * @type: the data type
3791 * Validate that a data load uses the appropriate data type for
3792 * the destination register. A value of NULL for the data means
3793 * that its runtime gathered data, which is always of type
3796 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3797 const struct nft_data *data,
3798 enum nft_data_types type)
3803 case NFT_REG_VERDICT:
3804 if (data == NULL || type != NFT_DATA_VERDICT)
3807 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3808 err = nf_tables_check_loops(ctx, data->chain);
3812 if (ctx->chain->level + 1 > data->chain->level) {
3813 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3815 data->chain->level = ctx->chain->level + 1;
3821 if (data != NULL && type != NFT_DATA_VALUE)
3826 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3828 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3829 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3830 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3831 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3834 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3835 struct nft_data_desc *desc, const struct nlattr *nla)
3837 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3838 struct nft_chain *chain;
3841 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3845 if (!tb[NFTA_VERDICT_CODE])
3847 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3849 switch (data->verdict) {
3851 switch (data->verdict & NF_VERDICT_MASK) {
3863 desc->len = sizeof(data->verdict);
3867 if (!tb[NFTA_VERDICT_CHAIN])
3869 chain = nf_tables_chain_lookup(ctx->table,
3870 tb[NFTA_VERDICT_CHAIN]);
3872 return PTR_ERR(chain);
3873 if (chain->flags & NFT_BASE_CHAIN)
3877 data->chain = chain;
3878 desc->len = sizeof(data);
3882 desc->type = NFT_DATA_VERDICT;
3886 static void nft_verdict_uninit(const struct nft_data *data)
3888 switch (data->verdict) {
3896 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
3898 struct nlattr *nest;
3900 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
3902 goto nla_put_failure;
3904 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
3905 goto nla_put_failure;
3907 switch (data->verdict) {
3910 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
3911 goto nla_put_failure;
3913 nla_nest_end(skb, nest);
3920 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
3921 struct nft_data_desc *desc, const struct nlattr *nla)
3928 if (len > sizeof(data->data))
3931 nla_memcpy(data->data, nla, sizeof(data->data));
3932 desc->type = NFT_DATA_VALUE;
3937 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
3940 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
3943 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
3944 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
3945 .len = FIELD_SIZEOF(struct nft_data, data) },
3946 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
3950 * nft_data_init - parse nf_tables data netlink attributes
3952 * @ctx: context of the expression using the data
3953 * @data: destination struct nft_data
3954 * @desc: data description
3955 * @nla: netlink attribute containing data
3957 * Parse the netlink data attributes and initialize a struct nft_data.
3958 * The type and length of data are returned in the data description.
3960 * The caller can indicate that it only wants to accept data of type
3961 * NFT_DATA_VALUE by passing NULL for the ctx argument.
3963 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
3964 struct nft_data_desc *desc, const struct nlattr *nla)
3966 struct nlattr *tb[NFTA_DATA_MAX + 1];
3969 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
3973 if (tb[NFTA_DATA_VALUE])
3974 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
3975 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
3976 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
3979 EXPORT_SYMBOL_GPL(nft_data_init);
3982 * nft_data_uninit - release a nft_data item
3984 * @data: struct nft_data to release
3985 * @type: type of data
3987 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3988 * all others need to be released by calling this function.
3990 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
3992 if (type < NFT_DATA_VERDICT)
3995 case NFT_DATA_VERDICT:
3996 return nft_verdict_uninit(data);
4001 EXPORT_SYMBOL_GPL(nft_data_uninit);
4003 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4004 enum nft_data_types type, unsigned int len)
4006 struct nlattr *nest;
4009 nest = nla_nest_start(skb, attr);
4014 case NFT_DATA_VALUE:
4015 err = nft_value_dump(skb, data, len);
4017 case NFT_DATA_VERDICT:
4018 err = nft_verdict_dump(skb, data);
4025 nla_nest_end(skb, nest);
4028 EXPORT_SYMBOL_GPL(nft_data_dump);
4030 static int nf_tables_init_net(struct net *net)
4032 INIT_LIST_HEAD(&net->nft.af_info);
4033 INIT_LIST_HEAD(&net->nft.commit_list);
4034 net->nft.base_seq = 1;
4038 static struct pernet_operations nf_tables_net_ops = {
4039 .init = nf_tables_init_net,
4042 static int __init nf_tables_module_init(void)
4046 err = register_pernet_subsys(&nf_tables_net_ops);
4050 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4057 err = nf_tables_core_module_init();
4062 err = nfnetlink_subsys_register(&nf_tables_subsys);
4066 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4069 nf_tables_core_module_exit();
4073 unregister_pernet_subsys(&nf_tables_net_ops);
4077 static void __exit nf_tables_module_exit(void)
4079 unregister_pernet_subsys(&nf_tables_net_ops);
4080 nfnetlink_subsys_unregister(&nf_tables_subsys);
4081 nf_tables_core_module_exit();
4085 module_init(nf_tables_module_init);
4086 module_exit(nf_tables_module_exit);
4088 MODULE_LICENSE("GPL");
4089 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4090 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);