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.
892 stats = this_cpu_ptr(newstats);
893 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
894 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
899 static void nft_chain_stats_replace(struct nft_base_chain *chain,
900 struct nft_stats __percpu *newstats)
903 struct nft_stats __percpu *oldstats =
904 nft_dereference(chain->stats);
906 rcu_assign_pointer(chain->stats, newstats);
908 free_percpu(oldstats);
910 rcu_assign_pointer(chain->stats, newstats);
913 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
915 struct nft_trans *trans;
917 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
921 if (msg_type == NFT_MSG_NEWCHAIN)
922 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
924 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
928 static void nf_tables_chain_destroy(struct nft_chain *chain)
930 BUG_ON(chain->use > 0);
932 if (chain->flags & NFT_BASE_CHAIN) {
933 module_put(nft_base_chain(chain)->type->owner);
934 free_percpu(nft_base_chain(chain)->stats);
935 kfree(nft_base_chain(chain));
941 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
942 const struct nlmsghdr *nlh,
943 const struct nlattr * const nla[])
945 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
946 const struct nlattr * uninitialized_var(name);
947 struct nft_af_info *afi;
948 struct nft_table *table;
949 struct nft_chain *chain;
950 struct nft_base_chain *basechain = NULL;
951 struct nlattr *ha[NFTA_HOOK_MAX + 1];
952 struct net *net = sock_net(skb->sk);
953 int family = nfmsg->nfgen_family;
954 u8 policy = NF_ACCEPT;
957 struct nft_stats __percpu *stats;
962 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
964 afi = nf_tables_afinfo_lookup(net, family, true);
968 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
970 return PTR_ERR(table);
973 name = nla[NFTA_CHAIN_NAME];
975 if (nla[NFTA_CHAIN_HANDLE]) {
976 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
977 chain = nf_tables_chain_lookup_byhandle(table, handle);
979 return PTR_ERR(chain);
981 chain = nf_tables_chain_lookup(table, name);
983 if (PTR_ERR(chain) != -ENOENT)
984 return PTR_ERR(chain);
989 if (nla[NFTA_CHAIN_POLICY]) {
990 if ((chain != NULL &&
991 !(chain->flags & NFT_BASE_CHAIN)) ||
992 nla[NFTA_CHAIN_HOOK] == NULL)
995 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1005 if (chain != NULL) {
1006 struct nft_stats *stats = NULL;
1007 struct nft_trans *trans;
1009 if (chain->flags & NFT_CHAIN_INACTIVE)
1011 if (nlh->nlmsg_flags & NLM_F_EXCL)
1013 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1016 if (nla[NFTA_CHAIN_HANDLE] && name &&
1017 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1020 if (nla[NFTA_CHAIN_COUNTERS]) {
1021 if (!(chain->flags & NFT_BASE_CHAIN))
1024 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1026 return PTR_ERR(stats);
1029 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1030 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1031 sizeof(struct nft_trans_chain));
1035 nft_trans_chain_stats(trans) = stats;
1036 nft_trans_chain_update(trans) = true;
1038 if (nla[NFTA_CHAIN_POLICY])
1039 nft_trans_chain_policy(trans) = policy;
1041 nft_trans_chain_policy(trans) = -1;
1043 if (nla[NFTA_CHAIN_HANDLE] && name) {
1044 nla_strlcpy(nft_trans_chain_name(trans), name,
1045 NFT_CHAIN_MAXNAMELEN);
1047 list_add_tail(&trans->list, &net->nft.commit_list);
1051 if (table->use == UINT_MAX)
1054 if (nla[NFTA_CHAIN_HOOK]) {
1055 const struct nf_chain_type *type;
1056 struct nf_hook_ops *ops;
1058 u32 hooknum, priority;
1060 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1061 if (nla[NFTA_CHAIN_TYPE]) {
1062 type = nf_tables_chain_type_lookup(afi,
1063 nla[NFTA_CHAIN_TYPE],
1066 return PTR_ERR(type);
1069 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1073 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1074 ha[NFTA_HOOK_PRIORITY] == NULL)
1077 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1078 if (hooknum >= afi->nhooks)
1080 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1082 if (!(type->hook_mask & (1 << hooknum)))
1084 if (!try_module_get(type->owner))
1086 hookfn = type->hooks[hooknum];
1088 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1089 if (basechain == NULL)
1092 if (nla[NFTA_CHAIN_COUNTERS]) {
1093 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1094 if (IS_ERR(stats)) {
1095 module_put(type->owner);
1097 return PTR_ERR(stats);
1099 basechain->stats = stats;
1101 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1102 if (IS_ERR(stats)) {
1103 module_put(type->owner);
1105 return PTR_ERR(stats);
1107 rcu_assign_pointer(basechain->stats, stats);
1110 basechain->type = type;
1111 chain = &basechain->chain;
1113 for (i = 0; i < afi->nops; i++) {
1114 ops = &basechain->ops[i];
1116 ops->owner = afi->owner;
1117 ops->hooknum = hooknum;
1118 ops->priority = priority;
1120 ops->hook = afi->hooks[ops->hooknum];
1123 if (afi->hook_ops_init)
1124 afi->hook_ops_init(ops, i);
1127 chain->flags |= NFT_BASE_CHAIN;
1128 basechain->policy = policy;
1130 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1135 INIT_LIST_HEAD(&chain->rules);
1136 chain->handle = nf_tables_alloc_handle(table);
1138 chain->table = table;
1139 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1141 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1142 chain->flags & NFT_BASE_CHAIN) {
1143 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1148 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1149 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1154 list_add_tail_rcu(&chain->list, &table->chains);
1157 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1158 chain->flags & NFT_BASE_CHAIN) {
1159 nf_unregister_hooks(nft_base_chain(chain)->ops,
1163 nf_tables_chain_destroy(chain);
1167 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1168 const struct nlmsghdr *nlh,
1169 const struct nlattr * const nla[])
1171 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1172 struct nft_af_info *afi;
1173 struct nft_table *table;
1174 struct nft_chain *chain;
1175 struct net *net = sock_net(skb->sk);
1176 int family = nfmsg->nfgen_family;
1180 afi = nf_tables_afinfo_lookup(net, family, false);
1182 return PTR_ERR(afi);
1184 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1186 return PTR_ERR(table);
1187 if (table->flags & NFT_TABLE_INACTIVE)
1190 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1192 return PTR_ERR(chain);
1193 if (chain->flags & NFT_CHAIN_INACTIVE)
1198 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1199 err = nft_trans_chain_add(&ctx, NFT_MSG_DELCHAIN);
1204 list_del_rcu(&chain->list);
1213 * nft_register_expr - register nf_tables expr type
1216 * Registers the expr type for use with nf_tables. Returns zero on
1217 * success or a negative errno code otherwise.
1219 int nft_register_expr(struct nft_expr_type *type)
1221 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1222 if (type->family == NFPROTO_UNSPEC)
1223 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1225 list_add_rcu(&type->list, &nf_tables_expressions);
1226 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1229 EXPORT_SYMBOL_GPL(nft_register_expr);
1232 * nft_unregister_expr - unregister nf_tables expr type
1235 * Unregisters the expr typefor use with nf_tables.
1237 void nft_unregister_expr(struct nft_expr_type *type)
1239 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1240 list_del_rcu(&type->list);
1241 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1243 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1245 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1248 const struct nft_expr_type *type;
1250 list_for_each_entry(type, &nf_tables_expressions, list) {
1251 if (!nla_strcmp(nla, type->name) &&
1252 (!type->family || type->family == family))
1258 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1261 const struct nft_expr_type *type;
1264 return ERR_PTR(-EINVAL);
1266 type = __nft_expr_type_get(family, nla);
1267 if (type != NULL && try_module_get(type->owner))
1270 #ifdef CONFIG_MODULES
1272 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1273 request_module("nft-expr-%u-%.*s", family,
1274 nla_len(nla), (char *)nla_data(nla));
1275 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1276 if (__nft_expr_type_get(family, nla))
1277 return ERR_PTR(-EAGAIN);
1279 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1280 request_module("nft-expr-%.*s",
1281 nla_len(nla), (char *)nla_data(nla));
1282 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1283 if (__nft_expr_type_get(family, nla))
1284 return ERR_PTR(-EAGAIN);
1287 return ERR_PTR(-ENOENT);
1290 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1291 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1292 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1295 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1296 const struct nft_expr *expr)
1298 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1299 goto nla_put_failure;
1301 if (expr->ops->dump) {
1302 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1304 goto nla_put_failure;
1305 if (expr->ops->dump(skb, expr) < 0)
1306 goto nla_put_failure;
1307 nla_nest_end(skb, data);
1316 struct nft_expr_info {
1317 const struct nft_expr_ops *ops;
1318 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1321 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1322 const struct nlattr *nla,
1323 struct nft_expr_info *info)
1325 const struct nft_expr_type *type;
1326 const struct nft_expr_ops *ops;
1327 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1330 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1334 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1336 return PTR_ERR(type);
1338 if (tb[NFTA_EXPR_DATA]) {
1339 err = nla_parse_nested(info->tb, type->maxattr,
1340 tb[NFTA_EXPR_DATA], type->policy);
1344 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1346 if (type->select_ops != NULL) {
1347 ops = type->select_ops(ctx,
1348 (const struct nlattr * const *)info->tb);
1360 module_put(type->owner);
1364 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1365 const struct nft_expr_info *info,
1366 struct nft_expr *expr)
1368 const struct nft_expr_ops *ops = info->ops;
1373 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1385 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1386 struct nft_expr *expr)
1388 if (expr->ops->destroy)
1389 expr->ops->destroy(ctx, expr);
1390 module_put(expr->ops->type->owner);
1397 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1400 struct nft_rule *rule;
1402 // FIXME: this sucks
1403 list_for_each_entry(rule, &chain->rules, list) {
1404 if (handle == rule->handle)
1408 return ERR_PTR(-ENOENT);
1411 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1412 const struct nlattr *nla)
1415 return ERR_PTR(-EINVAL);
1417 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1420 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1421 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1422 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1423 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1424 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1425 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1426 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1427 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1428 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1429 .len = NFT_USERDATA_MAXLEN },
1432 static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq,
1433 int event, u32 flags, int family,
1434 const struct nft_table *table,
1435 const struct nft_chain *chain,
1436 const struct nft_rule *rule)
1438 struct nlmsghdr *nlh;
1439 struct nfgenmsg *nfmsg;
1440 const struct nft_expr *expr, *next;
1441 struct nlattr *list;
1442 const struct nft_rule *prule;
1443 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1445 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1448 goto nla_put_failure;
1450 nfmsg = nlmsg_data(nlh);
1451 nfmsg->nfgen_family = family;
1452 nfmsg->version = NFNETLINK_V0;
1455 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1456 goto nla_put_failure;
1457 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1458 goto nla_put_failure;
1459 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1460 goto nla_put_failure;
1462 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1463 prule = list_entry(rule->list.prev, struct nft_rule, list);
1464 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1465 cpu_to_be64(prule->handle)))
1466 goto nla_put_failure;
1469 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1471 goto nla_put_failure;
1472 nft_rule_for_each_expr(expr, next, rule) {
1473 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1475 goto nla_put_failure;
1476 if (nf_tables_fill_expr_info(skb, expr) < 0)
1477 goto nla_put_failure;
1478 nla_nest_end(skb, elem);
1480 nla_nest_end(skb, list);
1483 nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule)))
1484 goto nla_put_failure;
1486 return nlmsg_end(skb, nlh);
1489 nlmsg_trim(skb, nlh);
1493 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1494 const struct nft_rule *rule,
1497 struct sk_buff *skb;
1501 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1505 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1509 err = nf_tables_fill_rule_info(skb, ctx->portid, ctx->seq, event, 0,
1510 ctx->afi->family, ctx->table,
1517 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1518 ctx->report, GFP_KERNEL);
1521 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1528 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
1530 return (rule->genmask & (1 << net->nft.gencursor)) == 0;
1533 static inline int gencursor_next(struct net *net)
1535 return net->nft.gencursor+1 == 1 ? 1 : 0;
1539 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
1541 return (rule->genmask & (1 << gencursor_next(net))) == 0;
1545 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
1547 /* Now inactive, will be active in the future */
1548 rule->genmask = (1 << net->nft.gencursor);
1552 nft_rule_disactivate_next(struct net *net, struct nft_rule *rule)
1554 rule->genmask = (1 << gencursor_next(net));
1557 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
1562 static int nf_tables_dump_rules(struct sk_buff *skb,
1563 struct netlink_callback *cb)
1565 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1566 const struct nft_af_info *afi;
1567 const struct nft_table *table;
1568 const struct nft_chain *chain;
1569 const struct nft_rule *rule;
1570 unsigned int idx = 0, s_idx = cb->args[0];
1571 struct net *net = sock_net(skb->sk);
1572 int family = nfmsg->nfgen_family;
1575 cb->seq = net->nft.base_seq;
1577 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1578 if (family != NFPROTO_UNSPEC && family != afi->family)
1581 list_for_each_entry_rcu(table, &afi->tables, list) {
1582 list_for_each_entry_rcu(chain, &table->chains, list) {
1583 list_for_each_entry_rcu(rule, &chain->rules, list) {
1584 if (!nft_rule_is_active(net, rule))
1589 memset(&cb->args[1], 0,
1590 sizeof(cb->args) - sizeof(cb->args[0]));
1591 if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid,
1594 NLM_F_MULTI | NLM_F_APPEND,
1595 afi->family, table, chain, rule) < 0)
1598 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1612 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1613 const struct nlmsghdr *nlh,
1614 const struct nlattr * const nla[])
1616 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1617 const struct nft_af_info *afi;
1618 const struct nft_table *table;
1619 const struct nft_chain *chain;
1620 const struct nft_rule *rule;
1621 struct sk_buff *skb2;
1622 struct net *net = sock_net(skb->sk);
1623 int family = nfmsg->nfgen_family;
1626 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1627 struct netlink_dump_control c = {
1628 .dump = nf_tables_dump_rules,
1630 return netlink_dump_start(nlsk, skb, nlh, &c);
1633 afi = nf_tables_afinfo_lookup(net, family, false);
1635 return PTR_ERR(afi);
1637 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1639 return PTR_ERR(table);
1640 if (table->flags & NFT_TABLE_INACTIVE)
1643 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1645 return PTR_ERR(chain);
1646 if (chain->flags & NFT_CHAIN_INACTIVE)
1649 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1651 return PTR_ERR(rule);
1653 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1657 err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid,
1658 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1659 family, table, chain, rule);
1663 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1670 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1671 struct nft_rule *rule)
1673 struct nft_expr *expr;
1676 * Careful: some expressions might not be initialized in case this
1677 * is called on error from nf_tables_newrule().
1679 expr = nft_expr_first(rule);
1680 while (expr->ops && expr != nft_expr_last(rule)) {
1681 nf_tables_expr_destroy(ctx, expr);
1682 expr = nft_expr_next(expr);
1687 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
1688 struct nft_rule *rule)
1690 struct nft_trans *trans;
1692 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
1696 nft_trans_rule(trans) = rule;
1697 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1702 #define NFT_RULE_MAXEXPRS 128
1704 static struct nft_expr_info *info;
1706 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1707 const struct nlmsghdr *nlh,
1708 const struct nlattr * const nla[])
1710 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1711 struct nft_af_info *afi;
1712 struct net *net = sock_net(skb->sk);
1713 struct nft_table *table;
1714 struct nft_chain *chain;
1715 struct nft_rule *rule, *old_rule = NULL;
1716 struct nft_trans *trans = NULL;
1717 struct nft_expr *expr;
1720 unsigned int size, i, n, ulen = 0;
1723 u64 handle, pos_handle;
1725 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1727 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1729 return PTR_ERR(afi);
1731 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1733 return PTR_ERR(table);
1735 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1737 return PTR_ERR(chain);
1739 if (nla[NFTA_RULE_HANDLE]) {
1740 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1741 rule = __nf_tables_rule_lookup(chain, handle);
1743 return PTR_ERR(rule);
1745 if (nlh->nlmsg_flags & NLM_F_EXCL)
1747 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1752 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1754 handle = nf_tables_alloc_handle(table);
1756 if (chain->use == UINT_MAX)
1760 if (nla[NFTA_RULE_POSITION]) {
1761 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1764 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1765 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1766 if (IS_ERR(old_rule))
1767 return PTR_ERR(old_rule);
1770 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1774 if (nla[NFTA_RULE_EXPRESSIONS]) {
1775 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1777 if (nla_type(tmp) != NFTA_LIST_ELEM)
1779 if (n == NFT_RULE_MAXEXPRS)
1781 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1784 size += info[n].ops->size;
1789 if (nla[NFTA_RULE_USERDATA])
1790 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
1793 rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL);
1797 nft_rule_activate_next(net, rule);
1799 rule->handle = handle;
1804 nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen);
1806 expr = nft_expr_first(rule);
1807 for (i = 0; i < n; i++) {
1808 err = nf_tables_newexpr(&ctx, &info[i], expr);
1812 expr = nft_expr_next(expr);
1815 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
1816 if (nft_rule_is_active_next(net, old_rule)) {
1817 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
1819 if (trans == NULL) {
1823 nft_rule_disactivate_next(net, old_rule);
1825 list_add_tail_rcu(&rule->list, &old_rule->list);
1830 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
1832 list_add_rcu(&rule->list, &old_rule->list);
1834 list_add_tail_rcu(&rule->list, &chain->rules);
1837 list_add_tail_rcu(&rule->list, &old_rule->list);
1839 list_add_rcu(&rule->list, &chain->rules);
1842 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
1850 list_del_rcu(&rule->list);
1852 list_del_rcu(&nft_trans_rule(trans)->list);
1853 nft_rule_clear(net, nft_trans_rule(trans));
1854 nft_trans_destroy(trans);
1858 nf_tables_rule_destroy(&ctx, rule);
1860 for (i = 0; i < n; i++) {
1861 if (info[i].ops != NULL)
1862 module_put(info[i].ops->type->owner);
1868 nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule)
1870 /* You cannot delete the same rule twice */
1871 if (nft_rule_is_active_next(ctx->net, rule)) {
1872 if (nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule) == NULL)
1874 nft_rule_disactivate_next(ctx->net, rule);
1881 static int nf_table_delrule_by_chain(struct nft_ctx *ctx)
1883 struct nft_rule *rule;
1886 list_for_each_entry(rule, &ctx->chain->rules, list) {
1887 err = nf_tables_delrule_one(ctx, rule);
1894 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
1895 const struct nlmsghdr *nlh,
1896 const struct nlattr * const nla[])
1898 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1899 struct nft_af_info *afi;
1900 struct net *net = sock_net(skb->sk);
1901 struct nft_table *table;
1902 struct nft_chain *chain = NULL;
1903 struct nft_rule *rule;
1904 int family = nfmsg->nfgen_family, err = 0;
1907 afi = nf_tables_afinfo_lookup(net, family, false);
1909 return PTR_ERR(afi);
1911 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1913 return PTR_ERR(table);
1914 if (table->flags & NFT_TABLE_INACTIVE)
1917 if (nla[NFTA_RULE_CHAIN]) {
1918 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1920 return PTR_ERR(chain);
1923 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1926 if (nla[NFTA_RULE_HANDLE]) {
1927 rule = nf_tables_rule_lookup(chain,
1928 nla[NFTA_RULE_HANDLE]);
1930 return PTR_ERR(rule);
1932 err = nf_tables_delrule_one(&ctx, rule);
1934 err = nf_table_delrule_by_chain(&ctx);
1937 list_for_each_entry(chain, &table->chains, list) {
1939 err = nf_table_delrule_by_chain(&ctx);
1952 static LIST_HEAD(nf_tables_set_ops);
1954 int nft_register_set(struct nft_set_ops *ops)
1956 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1957 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
1958 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1961 EXPORT_SYMBOL_GPL(nft_register_set);
1963 void nft_unregister_set(struct nft_set_ops *ops)
1965 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1966 list_del_rcu(&ops->list);
1967 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1969 EXPORT_SYMBOL_GPL(nft_unregister_set);
1972 * Select a set implementation based on the data characteristics and the
1973 * given policy. The total memory use might not be known if no size is
1974 * given, in that case the amount of memory per element is used.
1976 static const struct nft_set_ops *
1977 nft_select_set_ops(const struct nlattr * const nla[],
1978 const struct nft_set_desc *desc,
1979 enum nft_set_policies policy)
1981 const struct nft_set_ops *ops, *bops;
1982 struct nft_set_estimate est, best;
1985 #ifdef CONFIG_MODULES
1986 if (list_empty(&nf_tables_set_ops)) {
1987 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1988 request_module("nft-set");
1989 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1990 if (!list_empty(&nf_tables_set_ops))
1991 return ERR_PTR(-EAGAIN);
1995 if (nla[NFTA_SET_FLAGS] != NULL) {
1996 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
1997 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
2004 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2005 if ((ops->features & features) != features)
2007 if (!ops->estimate(desc, features, &est))
2011 case NFT_SET_POL_PERFORMANCE:
2012 if (est.class < best.class)
2014 if (est.class == best.class && est.size < best.size)
2017 case NFT_SET_POL_MEMORY:
2018 if (est.size < best.size)
2020 if (est.size == best.size && est.class < best.class)
2027 if (!try_module_get(ops->owner))
2030 module_put(bops->owner);
2039 return ERR_PTR(-EOPNOTSUPP);
2042 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2043 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2044 [NFTA_SET_NAME] = { .type = NLA_STRING,
2045 .len = IFNAMSIZ - 1 },
2046 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2047 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2048 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2049 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2050 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2051 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2052 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2053 [NFTA_SET_ID] = { .type = NLA_U32 },
2056 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2057 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2060 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2061 const struct sk_buff *skb,
2062 const struct nlmsghdr *nlh,
2063 const struct nlattr * const nla[])
2065 struct net *net = sock_net(skb->sk);
2066 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2067 struct nft_af_info *afi = NULL;
2068 struct nft_table *table = NULL;
2070 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2071 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2073 return PTR_ERR(afi);
2076 if (nla[NFTA_SET_TABLE] != NULL) {
2078 return -EAFNOSUPPORT;
2080 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2082 return PTR_ERR(table);
2083 if (table->flags & NFT_TABLE_INACTIVE)
2087 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2091 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2092 const struct nlattr *nla)
2094 struct nft_set *set;
2097 return ERR_PTR(-EINVAL);
2099 list_for_each_entry(set, &table->sets, list) {
2100 if (!nla_strcmp(nla, set->name))
2103 return ERR_PTR(-ENOENT);
2106 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2107 const struct nlattr *nla)
2109 struct nft_trans *trans;
2110 u32 id = ntohl(nla_get_be32(nla));
2112 list_for_each_entry(trans, &net->nft.commit_list, list) {
2113 if (trans->msg_type == NFT_MSG_NEWSET &&
2114 id == nft_trans_set_id(trans))
2115 return nft_trans_set(trans);
2117 return ERR_PTR(-ENOENT);
2120 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2123 const struct nft_set *i;
2125 unsigned long *inuse;
2126 unsigned int n = 0, min = 0;
2128 p = strnchr(name, IFNAMSIZ, '%');
2130 if (p[1] != 'd' || strchr(p + 2, '%'))
2133 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2137 list_for_each_entry(i, &ctx->table->sets, list) {
2140 if (!sscanf(i->name, name, &tmp))
2142 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2145 set_bit(tmp - min, inuse);
2148 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2149 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2150 min += BITS_PER_BYTE * PAGE_SIZE;
2151 memset(inuse, 0, PAGE_SIZE);
2154 free_page((unsigned long)inuse);
2157 snprintf(set->name, sizeof(set->name), name, min + n);
2158 list_for_each_entry(i, &ctx->table->sets, list) {
2159 if (!strcmp(set->name, i->name))
2165 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2166 const struct nft_set *set, u16 event, u16 flags)
2168 struct nfgenmsg *nfmsg;
2169 struct nlmsghdr *nlh;
2170 struct nlattr *desc;
2171 u32 portid = ctx->portid;
2174 event |= NFNL_SUBSYS_NFTABLES << 8;
2175 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2178 goto nla_put_failure;
2180 nfmsg = nlmsg_data(nlh);
2181 nfmsg->nfgen_family = ctx->afi->family;
2182 nfmsg->version = NFNETLINK_V0;
2185 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2186 goto nla_put_failure;
2187 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2188 goto nla_put_failure;
2189 if (set->flags != 0)
2190 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2191 goto nla_put_failure;
2193 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2194 goto nla_put_failure;
2195 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2196 goto nla_put_failure;
2197 if (set->flags & NFT_SET_MAP) {
2198 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2199 goto nla_put_failure;
2200 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2201 goto nla_put_failure;
2204 desc = nla_nest_start(skb, NFTA_SET_DESC);
2206 goto nla_put_failure;
2208 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2209 goto nla_put_failure;
2210 nla_nest_end(skb, desc);
2212 return nlmsg_end(skb, nlh);
2215 nlmsg_trim(skb, nlh);
2219 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2220 const struct nft_set *set,
2221 int event, gfp_t gfp_flags)
2223 struct sk_buff *skb;
2224 u32 portid = ctx->portid;
2228 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2232 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2236 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2242 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2243 ctx->report, gfp_flags);
2246 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2250 static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb,
2251 struct netlink_callback *cb)
2253 const struct nft_set *set;
2254 unsigned int idx = 0, s_idx = cb->args[0];
2260 cb->seq = ctx->net->nft.base_seq;
2262 list_for_each_entry_rcu(set, &ctx->table->sets, list) {
2265 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2270 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2280 static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb,
2281 struct netlink_callback *cb)
2283 const struct nft_set *set;
2284 unsigned int idx, s_idx = cb->args[0];
2285 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2291 cb->seq = ctx->net->nft.base_seq;
2293 list_for_each_entry_rcu(table, &ctx->afi->tables, list) {
2295 if (cur_table != table)
2302 list_for_each_entry_rcu(set, &ctx->table->sets, list) {
2305 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2308 cb->args[2] = (unsigned long) table;
2311 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2322 static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb,
2323 struct netlink_callback *cb)
2325 const struct nft_set *set;
2326 unsigned int idx, s_idx = cb->args[0];
2327 struct nft_af_info *afi;
2328 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2329 struct net *net = sock_net(skb->sk);
2330 int cur_family = cb->args[3];
2336 cb->seq = net->nft.base_seq;
2338 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2340 if (afi->family != cur_family)
2346 list_for_each_entry_rcu(table, &afi->tables, list) {
2348 if (cur_table != table)
2357 list_for_each_entry_rcu(set, &ctx->table->sets, list) {
2360 if (nf_tables_fill_set(skb, ctx, set,
2364 cb->args[2] = (unsigned long) table;
2365 cb->args[3] = afi->family;
2368 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2382 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2384 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2385 struct nlattr *nla[NFTA_SET_MAX + 1];
2389 err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX,
2394 err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla);
2398 if (ctx.table == NULL) {
2399 if (ctx.afi == NULL)
2400 ret = nf_tables_dump_sets_all(&ctx, skb, cb);
2402 ret = nf_tables_dump_sets_family(&ctx, skb, cb);
2404 ret = nf_tables_dump_sets_table(&ctx, skb, cb);
2409 #define NFT_SET_INACTIVE (1 << 15) /* Internal set flag */
2411 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2412 const struct nlmsghdr *nlh,
2413 const struct nlattr * const nla[])
2415 const struct nft_set *set;
2417 struct sk_buff *skb2;
2418 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2421 /* Verify existance before starting dump */
2422 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2426 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2427 struct netlink_dump_control c = {
2428 .dump = nf_tables_dump_sets,
2430 return netlink_dump_start(nlsk, skb, nlh, &c);
2433 /* Only accept unspec with dump */
2434 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2435 return -EAFNOSUPPORT;
2437 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2439 return PTR_ERR(set);
2440 if (set->flags & NFT_SET_INACTIVE)
2443 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2447 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2451 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2458 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2459 struct nft_set_desc *desc,
2460 const struct nlattr *nla)
2462 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2465 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2469 if (da[NFTA_SET_DESC_SIZE] != NULL)
2470 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2475 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
2476 struct nft_set *set)
2478 struct nft_trans *trans;
2480 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
2484 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
2485 nft_trans_set_id(trans) =
2486 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
2487 set->flags |= NFT_SET_INACTIVE;
2489 nft_trans_set(trans) = set;
2490 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2495 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2496 const struct nlmsghdr *nlh,
2497 const struct nlattr * const nla[])
2499 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2500 const struct nft_set_ops *ops;
2501 struct nft_af_info *afi;
2502 struct net *net = sock_net(skb->sk);
2503 struct nft_table *table;
2504 struct nft_set *set;
2506 char name[IFNAMSIZ];
2509 u32 ktype, dtype, flags, policy;
2510 struct nft_set_desc desc;
2513 if (nla[NFTA_SET_TABLE] == NULL ||
2514 nla[NFTA_SET_NAME] == NULL ||
2515 nla[NFTA_SET_KEY_LEN] == NULL ||
2516 nla[NFTA_SET_ID] == NULL)
2519 memset(&desc, 0, sizeof(desc));
2521 ktype = NFT_DATA_VALUE;
2522 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2523 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2524 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2528 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2529 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2533 if (nla[NFTA_SET_FLAGS] != NULL) {
2534 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2535 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2536 NFT_SET_INTERVAL | NFT_SET_MAP))
2541 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2542 if (!(flags & NFT_SET_MAP))
2545 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2546 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2547 dtype != NFT_DATA_VERDICT)
2550 if (dtype != NFT_DATA_VERDICT) {
2551 if (nla[NFTA_SET_DATA_LEN] == NULL)
2553 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2554 if (desc.dlen == 0 ||
2555 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2558 desc.dlen = sizeof(struct nft_data);
2559 } else if (flags & NFT_SET_MAP)
2562 policy = NFT_SET_POL_PERFORMANCE;
2563 if (nla[NFTA_SET_POLICY] != NULL)
2564 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2566 if (nla[NFTA_SET_DESC] != NULL) {
2567 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2572 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2574 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2576 return PTR_ERR(afi);
2578 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2580 return PTR_ERR(table);
2582 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2584 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2586 if (PTR_ERR(set) != -ENOENT)
2587 return PTR_ERR(set);
2592 if (nlh->nlmsg_flags & NLM_F_EXCL)
2594 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2599 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2602 ops = nft_select_set_ops(nla, &desc, policy);
2604 return PTR_ERR(ops);
2607 if (ops->privsize != NULL)
2608 size = ops->privsize(nla);
2611 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2615 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2616 err = nf_tables_set_alloc_name(&ctx, set, name);
2620 INIT_LIST_HEAD(&set->bindings);
2623 set->klen = desc.klen;
2625 set->dlen = desc.dlen;
2627 set->size = desc.size;
2629 err = ops->init(set, &desc, nla);
2633 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2637 list_add_tail_rcu(&set->list, &table->sets);
2644 module_put(ops->owner);
2648 static void nft_set_destroy(struct nft_set *set)
2650 set->ops->destroy(set);
2651 module_put(set->ops->owner);
2655 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2657 list_del_rcu(&set->list);
2658 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2659 nft_set_destroy(set);
2662 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2663 const struct nlmsghdr *nlh,
2664 const struct nlattr * const nla[])
2666 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2667 struct nft_set *set;
2671 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2672 return -EAFNOSUPPORT;
2673 if (nla[NFTA_SET_TABLE] == NULL)
2676 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2680 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2682 return PTR_ERR(set);
2683 if (set->flags & NFT_SET_INACTIVE)
2685 if (!list_empty(&set->bindings))
2688 err = nft_trans_set_add(&ctx, NFT_MSG_DELSET, set);
2692 list_del_rcu(&set->list);
2697 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2698 const struct nft_set *set,
2699 const struct nft_set_iter *iter,
2700 const struct nft_set_elem *elem)
2702 enum nft_registers dreg;
2704 dreg = nft_type_to_reg(set->dtype);
2705 return nft_validate_data_load(ctx, dreg, &elem->data,
2706 set->dtype == NFT_DATA_VERDICT ?
2707 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2710 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2711 struct nft_set_binding *binding)
2713 struct nft_set_binding *i;
2714 struct nft_set_iter iter;
2716 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2719 if (set->flags & NFT_SET_MAP) {
2720 /* If the set is already bound to the same chain all
2721 * jumps are already validated for that chain.
2723 list_for_each_entry(i, &set->bindings, list) {
2724 if (i->chain == binding->chain)
2731 iter.fn = nf_tables_bind_check_setelem;
2733 set->ops->walk(ctx, set, &iter);
2735 /* Destroy anonymous sets if binding fails */
2736 if (set->flags & NFT_SET_ANONYMOUS)
2737 nf_tables_set_destroy(ctx, set);
2743 binding->chain = ctx->chain;
2744 list_add_tail_rcu(&binding->list, &set->bindings);
2748 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2749 struct nft_set_binding *binding)
2751 list_del_rcu(&binding->list);
2753 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2754 !(set->flags & NFT_SET_INACTIVE))
2755 nf_tables_set_destroy(ctx, set);
2762 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2763 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2764 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2765 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2768 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2769 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2770 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2771 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2772 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2775 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2776 const struct sk_buff *skb,
2777 const struct nlmsghdr *nlh,
2778 const struct nlattr * const nla[],
2781 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2782 struct nft_af_info *afi;
2783 struct nft_table *table;
2784 struct net *net = sock_net(skb->sk);
2786 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2788 return PTR_ERR(afi);
2790 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2792 return PTR_ERR(table);
2793 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2796 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2800 static int nf_tables_fill_setelem(struct sk_buff *skb,
2801 const struct nft_set *set,
2802 const struct nft_set_elem *elem)
2804 unsigned char *b = skb_tail_pointer(skb);
2805 struct nlattr *nest;
2807 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2809 goto nla_put_failure;
2811 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2813 goto nla_put_failure;
2815 if (set->flags & NFT_SET_MAP &&
2816 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2817 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2818 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2820 goto nla_put_failure;
2822 if (elem->flags != 0)
2823 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2824 goto nla_put_failure;
2826 nla_nest_end(skb, nest);
2834 struct nft_set_dump_args {
2835 const struct netlink_callback *cb;
2836 struct nft_set_iter iter;
2837 struct sk_buff *skb;
2840 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2841 const struct nft_set *set,
2842 const struct nft_set_iter *iter,
2843 const struct nft_set_elem *elem)
2845 struct nft_set_dump_args *args;
2847 args = container_of(iter, struct nft_set_dump_args, iter);
2848 return nf_tables_fill_setelem(args->skb, set, elem);
2851 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2853 const struct nft_set *set;
2854 struct nft_set_dump_args args;
2856 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2857 struct nfgenmsg *nfmsg;
2858 struct nlmsghdr *nlh;
2859 struct nlattr *nest;
2863 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2864 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2868 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
2873 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2875 return PTR_ERR(set);
2876 if (set->flags & NFT_SET_INACTIVE)
2879 event = NFT_MSG_NEWSETELEM;
2880 event |= NFNL_SUBSYS_NFTABLES << 8;
2881 portid = NETLINK_CB(cb->skb).portid;
2882 seq = cb->nlh->nlmsg_seq;
2884 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2887 goto nla_put_failure;
2889 nfmsg = nlmsg_data(nlh);
2890 nfmsg->nfgen_family = ctx.afi->family;
2891 nfmsg->version = NFNETLINK_V0;
2894 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2895 goto nla_put_failure;
2896 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2897 goto nla_put_failure;
2899 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2901 goto nla_put_failure;
2905 args.iter.skip = cb->args[0];
2906 args.iter.count = 0;
2908 args.iter.fn = nf_tables_dump_setelem;
2909 set->ops->walk(&ctx, set, &args.iter);
2911 nla_nest_end(skb, nest);
2912 nlmsg_end(skb, nlh);
2914 if (args.iter.err && args.iter.err != -EMSGSIZE)
2915 return args.iter.err;
2916 if (args.iter.count == cb->args[0])
2919 cb->args[0] = args.iter.count;
2926 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2927 const struct nlmsghdr *nlh,
2928 const struct nlattr * const nla[])
2930 const struct nft_set *set;
2934 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
2938 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2940 return PTR_ERR(set);
2941 if (set->flags & NFT_SET_INACTIVE)
2944 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2945 struct netlink_dump_control c = {
2946 .dump = nf_tables_dump_set,
2948 return netlink_dump_start(nlsk, skb, nlh, &c);
2953 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
2954 const struct nft_ctx *ctx, u32 seq,
2955 u32 portid, int event, u16 flags,
2956 const struct nft_set *set,
2957 const struct nft_set_elem *elem)
2959 struct nfgenmsg *nfmsg;
2960 struct nlmsghdr *nlh;
2961 struct nlattr *nest;
2964 event |= NFNL_SUBSYS_NFTABLES << 8;
2965 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2968 goto nla_put_failure;
2970 nfmsg = nlmsg_data(nlh);
2971 nfmsg->nfgen_family = ctx->afi->family;
2972 nfmsg->version = NFNETLINK_V0;
2975 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2976 goto nla_put_failure;
2977 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2978 goto nla_put_failure;
2980 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2982 goto nla_put_failure;
2984 err = nf_tables_fill_setelem(skb, set, elem);
2986 goto nla_put_failure;
2988 nla_nest_end(skb, nest);
2990 return nlmsg_end(skb, nlh);
2993 nlmsg_trim(skb, nlh);
2997 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
2998 const struct nft_set *set,
2999 const struct nft_set_elem *elem,
3000 int event, u16 flags)
3002 struct net *net = ctx->net;
3003 u32 portid = ctx->portid;
3004 struct sk_buff *skb;
3007 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3011 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3015 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3022 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3026 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3030 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3032 struct nft_set *set)
3034 struct nft_trans *trans;
3036 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3040 nft_trans_elem_set(trans) = set;
3044 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3045 const struct nlattr *attr)
3047 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3048 struct nft_data_desc d1, d2;
3049 struct nft_set_elem elem;
3050 struct nft_set_binding *binding;
3051 enum nft_registers dreg;
3052 struct nft_trans *trans;
3055 if (set->size && set->nelems == set->size)
3058 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3059 nft_set_elem_policy);
3063 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3067 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3068 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3069 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
3073 if (set->flags & NFT_SET_MAP) {
3074 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3075 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
3077 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3078 elem.flags & NFT_SET_ELEM_INTERVAL_END)
3081 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3085 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3089 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3093 if (set->ops->get(set, &elem) == 0)
3096 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3097 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
3102 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3105 dreg = nft_type_to_reg(set->dtype);
3106 list_for_each_entry(binding, &set->bindings, list) {
3107 struct nft_ctx bind_ctx = {
3109 .table = ctx->table,
3110 .chain = (struct nft_chain *)binding->chain,
3113 err = nft_validate_data_load(&bind_ctx, dreg,
3114 &elem.data, d2.type);
3120 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3124 err = set->ops->insert(set, &elem);
3128 nft_trans_elem(trans) = elem;
3129 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3135 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3136 nft_data_uninit(&elem.data, d2.type);
3138 nft_data_uninit(&elem.key, d1.type);
3143 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3144 const struct nlmsghdr *nlh,
3145 const struct nlattr * const nla[])
3147 struct net *net = sock_net(skb->sk);
3148 const struct nlattr *attr;
3149 struct nft_set *set;
3153 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3157 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3159 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3160 set = nf_tables_set_lookup_byid(net,
3161 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3164 return PTR_ERR(set);
3167 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3170 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3171 err = nft_add_set_elem(&ctx, set, attr);
3180 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3181 const struct nlattr *attr)
3183 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3184 struct nft_data_desc desc;
3185 struct nft_set_elem elem;
3186 struct nft_trans *trans;
3189 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3190 nft_set_elem_policy);
3195 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3198 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3203 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3206 err = set->ops->get(set, &elem);
3210 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3214 nft_trans_elem(trans) = elem;
3215 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3217 nft_data_uninit(&elem.key, NFT_DATA_VALUE);
3218 if (set->flags & NFT_SET_MAP)
3219 nft_data_uninit(&elem.data, set->dtype);
3222 nft_data_uninit(&elem.key, desc.type);
3227 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3228 const struct nlmsghdr *nlh,
3229 const struct nlattr * const nla[])
3231 const struct nlattr *attr;
3232 struct nft_set *set;
3236 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3240 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3242 return PTR_ERR(set);
3243 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3246 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3247 err = nft_del_setelem(&ctx, set, attr);
3256 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3257 [NFT_MSG_NEWTABLE] = {
3258 .call_batch = nf_tables_newtable,
3259 .attr_count = NFTA_TABLE_MAX,
3260 .policy = nft_table_policy,
3262 [NFT_MSG_GETTABLE] = {
3263 .call = nf_tables_gettable,
3264 .attr_count = NFTA_TABLE_MAX,
3265 .policy = nft_table_policy,
3267 [NFT_MSG_DELTABLE] = {
3268 .call_batch = nf_tables_deltable,
3269 .attr_count = NFTA_TABLE_MAX,
3270 .policy = nft_table_policy,
3272 [NFT_MSG_NEWCHAIN] = {
3273 .call_batch = nf_tables_newchain,
3274 .attr_count = NFTA_CHAIN_MAX,
3275 .policy = nft_chain_policy,
3277 [NFT_MSG_GETCHAIN] = {
3278 .call = nf_tables_getchain,
3279 .attr_count = NFTA_CHAIN_MAX,
3280 .policy = nft_chain_policy,
3282 [NFT_MSG_DELCHAIN] = {
3283 .call_batch = nf_tables_delchain,
3284 .attr_count = NFTA_CHAIN_MAX,
3285 .policy = nft_chain_policy,
3287 [NFT_MSG_NEWRULE] = {
3288 .call_batch = nf_tables_newrule,
3289 .attr_count = NFTA_RULE_MAX,
3290 .policy = nft_rule_policy,
3292 [NFT_MSG_GETRULE] = {
3293 .call = nf_tables_getrule,
3294 .attr_count = NFTA_RULE_MAX,
3295 .policy = nft_rule_policy,
3297 [NFT_MSG_DELRULE] = {
3298 .call_batch = nf_tables_delrule,
3299 .attr_count = NFTA_RULE_MAX,
3300 .policy = nft_rule_policy,
3302 [NFT_MSG_NEWSET] = {
3303 .call_batch = nf_tables_newset,
3304 .attr_count = NFTA_SET_MAX,
3305 .policy = nft_set_policy,
3307 [NFT_MSG_GETSET] = {
3308 .call = nf_tables_getset,
3309 .attr_count = NFTA_SET_MAX,
3310 .policy = nft_set_policy,
3312 [NFT_MSG_DELSET] = {
3313 .call_batch = nf_tables_delset,
3314 .attr_count = NFTA_SET_MAX,
3315 .policy = nft_set_policy,
3317 [NFT_MSG_NEWSETELEM] = {
3318 .call_batch = nf_tables_newsetelem,
3319 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3320 .policy = nft_set_elem_list_policy,
3322 [NFT_MSG_GETSETELEM] = {
3323 .call = nf_tables_getsetelem,
3324 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3325 .policy = nft_set_elem_list_policy,
3327 [NFT_MSG_DELSETELEM] = {
3328 .call_batch = nf_tables_delsetelem,
3329 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3330 .policy = nft_set_elem_list_policy,
3334 static void nft_chain_commit_update(struct nft_trans *trans)
3336 struct nft_base_chain *basechain;
3338 if (nft_trans_chain_name(trans)[0])
3339 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3341 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3344 basechain = nft_base_chain(trans->ctx.chain);
3345 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3347 switch (nft_trans_chain_policy(trans)) {
3350 basechain->policy = nft_trans_chain_policy(trans);
3355 /* Schedule objects for release via rcu to make sure no packets are accesing
3358 static void nf_tables_commit_release_rcu(struct rcu_head *rt)
3360 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3362 switch (trans->msg_type) {
3363 case NFT_MSG_DELTABLE:
3364 nf_tables_table_destroy(&trans->ctx);
3366 case NFT_MSG_DELCHAIN:
3367 nf_tables_chain_destroy(trans->ctx.chain);
3369 case NFT_MSG_DELRULE:
3370 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3372 case NFT_MSG_DELSET:
3373 nft_set_destroy(nft_trans_set(trans));
3379 static int nf_tables_commit(struct sk_buff *skb)
3381 struct net *net = sock_net(skb->sk);
3382 struct nft_trans *trans, *next;
3383 struct nft_set *set;
3385 /* Bump generation counter, invalidate any dump in progress */
3386 while (++net->nft.base_seq == 0);
3388 /* A new generation has just started */
3389 net->nft.gencursor = gencursor_next(net);
3391 /* Make sure all packets have left the previous generation before
3392 * purging old rules.
3396 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3397 switch (trans->msg_type) {
3398 case NFT_MSG_NEWTABLE:
3399 if (nft_trans_table_update(trans)) {
3400 if (!nft_trans_table_enable(trans)) {
3401 nf_tables_table_disable(trans->ctx.afi,
3403 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3406 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3408 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3409 nft_trans_destroy(trans);
3411 case NFT_MSG_DELTABLE:
3412 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3414 case NFT_MSG_NEWCHAIN:
3415 if (nft_trans_chain_update(trans))
3416 nft_chain_commit_update(trans);
3418 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3420 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3421 nft_trans_destroy(trans);
3423 case NFT_MSG_DELCHAIN:
3424 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3425 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) &&
3426 trans->ctx.chain->flags & NFT_BASE_CHAIN) {
3427 nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops,
3428 trans->ctx.afi->nops);
3431 case NFT_MSG_NEWRULE:
3432 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3433 nf_tables_rule_notify(&trans->ctx,
3434 nft_trans_rule(trans),
3436 nft_trans_destroy(trans);
3438 case NFT_MSG_DELRULE:
3439 list_del_rcu(&nft_trans_rule(trans)->list);
3440 nf_tables_rule_notify(&trans->ctx,
3441 nft_trans_rule(trans),
3444 case NFT_MSG_NEWSET:
3445 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3446 /* This avoids hitting -EBUSY when deleting the table
3447 * from the transaction.
3449 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3450 !list_empty(&nft_trans_set(trans)->bindings))
3451 trans->ctx.table->use--;
3453 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3454 NFT_MSG_NEWSET, GFP_KERNEL);
3455 nft_trans_destroy(trans);
3457 case NFT_MSG_DELSET:
3458 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3459 NFT_MSG_DELSET, GFP_KERNEL);
3461 case NFT_MSG_NEWSETELEM:
3462 nf_tables_setelem_notify(&trans->ctx,
3463 nft_trans_elem_set(trans),
3464 &nft_trans_elem(trans),
3465 NFT_MSG_NEWSETELEM, 0);
3466 nft_trans_destroy(trans);
3468 case NFT_MSG_DELSETELEM:
3469 nf_tables_setelem_notify(&trans->ctx,
3470 nft_trans_elem_set(trans),
3471 &nft_trans_elem(trans),
3472 NFT_MSG_DELSETELEM, 0);
3473 set = nft_trans_elem_set(trans);
3474 set->ops->get(set, &nft_trans_elem(trans));
3475 set->ops->remove(set, &nft_trans_elem(trans));
3476 nft_trans_destroy(trans);
3481 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3482 list_del(&trans->list);
3483 trans->ctx.nla = NULL;
3484 call_rcu(&trans->rcu_head, nf_tables_commit_release_rcu);
3490 /* Schedule objects for release via rcu to make sure no packets are accesing
3493 static void nf_tables_abort_release_rcu(struct rcu_head *rt)
3495 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3497 switch (trans->msg_type) {
3498 case NFT_MSG_NEWTABLE:
3499 nf_tables_table_destroy(&trans->ctx);
3501 case NFT_MSG_NEWCHAIN:
3502 nf_tables_chain_destroy(trans->ctx.chain);
3504 case NFT_MSG_NEWRULE:
3505 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3507 case NFT_MSG_NEWSET:
3508 nft_set_destroy(nft_trans_set(trans));
3514 static int nf_tables_abort(struct sk_buff *skb)
3516 struct net *net = sock_net(skb->sk);
3517 struct nft_trans *trans, *next;
3518 struct nft_set *set;
3520 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3521 switch (trans->msg_type) {
3522 case NFT_MSG_NEWTABLE:
3523 if (nft_trans_table_update(trans)) {
3524 if (nft_trans_table_enable(trans)) {
3525 nf_tables_table_disable(trans->ctx.afi,
3527 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3529 nft_trans_destroy(trans);
3531 list_del_rcu(&trans->ctx.table->list);
3534 case NFT_MSG_DELTABLE:
3535 list_add_tail_rcu(&trans->ctx.table->list,
3536 &trans->ctx.afi->tables);
3537 nft_trans_destroy(trans);
3539 case NFT_MSG_NEWCHAIN:
3540 if (nft_trans_chain_update(trans)) {
3541 if (nft_trans_chain_stats(trans))
3542 free_percpu(nft_trans_chain_stats(trans));
3544 nft_trans_destroy(trans);
3546 trans->ctx.table->use--;
3547 list_del_rcu(&trans->ctx.chain->list);
3548 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) &&
3549 trans->ctx.chain->flags & NFT_BASE_CHAIN) {
3550 nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops,
3551 trans->ctx.afi->nops);
3555 case NFT_MSG_DELCHAIN:
3556 trans->ctx.table->use++;
3557 list_add_tail_rcu(&trans->ctx.chain->list,
3558 &trans->ctx.table->chains);
3559 nft_trans_destroy(trans);
3561 case NFT_MSG_NEWRULE:
3562 trans->ctx.chain->use--;
3563 list_del_rcu(&nft_trans_rule(trans)->list);
3565 case NFT_MSG_DELRULE:
3566 trans->ctx.chain->use++;
3567 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3568 nft_trans_destroy(trans);
3570 case NFT_MSG_NEWSET:
3571 trans->ctx.table->use--;
3572 list_del_rcu(&nft_trans_set(trans)->list);
3574 case NFT_MSG_DELSET:
3575 trans->ctx.table->use++;
3576 list_add_tail_rcu(&nft_trans_set(trans)->list,
3577 &trans->ctx.table->sets);
3578 nft_trans_destroy(trans);
3580 case NFT_MSG_NEWSETELEM:
3581 nft_trans_elem_set(trans)->nelems--;
3582 set = nft_trans_elem_set(trans);
3583 set->ops->get(set, &nft_trans_elem(trans));
3584 set->ops->remove(set, &nft_trans_elem(trans));
3585 nft_trans_destroy(trans);
3587 case NFT_MSG_DELSETELEM:
3588 nft_trans_elem_set(trans)->nelems++;
3589 nft_trans_destroy(trans);
3594 list_for_each_entry_safe_reverse(trans, next,
3595 &net->nft.commit_list, list) {
3596 list_del(&trans->list);
3597 trans->ctx.nla = NULL;
3598 call_rcu(&trans->rcu_head, nf_tables_abort_release_rcu);
3604 static const struct nfnetlink_subsystem nf_tables_subsys = {
3605 .name = "nf_tables",
3606 .subsys_id = NFNL_SUBSYS_NFTABLES,
3607 .cb_count = NFT_MSG_MAX,
3609 .commit = nf_tables_commit,
3610 .abort = nf_tables_abort,
3614 * Loop detection - walk through the ruleset beginning at the destination chain
3615 * of a new jump until either the source chain is reached (loop) or all
3616 * reachable chains have been traversed.
3618 * The loop check is performed whenever a new jump verdict is added to an
3619 * expression or verdict map or a verdict map is bound to a new chain.
3622 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3623 const struct nft_chain *chain);
3625 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3626 const struct nft_set *set,
3627 const struct nft_set_iter *iter,
3628 const struct nft_set_elem *elem)
3630 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3633 switch (elem->data.verdict) {
3636 return nf_tables_check_loops(ctx, elem->data.chain);
3642 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3643 const struct nft_chain *chain)
3645 const struct nft_rule *rule;
3646 const struct nft_expr *expr, *last;
3647 const struct nft_set *set;
3648 struct nft_set_binding *binding;
3649 struct nft_set_iter iter;
3651 if (ctx->chain == chain)
3654 list_for_each_entry(rule, &chain->rules, list) {
3655 nft_rule_for_each_expr(expr, last, rule) {
3656 const struct nft_data *data = NULL;
3659 if (!expr->ops->validate)
3662 err = expr->ops->validate(ctx, expr, &data);
3669 switch (data->verdict) {
3672 err = nf_tables_check_loops(ctx, data->chain);
3681 list_for_each_entry(set, &ctx->table->sets, list) {
3682 if (!(set->flags & NFT_SET_MAP) ||
3683 set->dtype != NFT_DATA_VERDICT)
3686 list_for_each_entry(binding, &set->bindings, list) {
3687 if (binding->chain != chain)
3693 iter.fn = nf_tables_loop_check_setelem;
3695 set->ops->walk(ctx, set, &iter);
3705 * nft_validate_input_register - validate an expressions' input register
3707 * @reg: the register number
3709 * Validate that the input register is one of the general purpose
3712 int nft_validate_input_register(enum nft_registers reg)
3714 if (reg <= NFT_REG_VERDICT)
3716 if (reg > NFT_REG_MAX)
3720 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3723 * nft_validate_output_register - validate an expressions' output register
3725 * @reg: the register number
3727 * Validate that the output register is one of the general purpose
3728 * registers or the verdict register.
3730 int nft_validate_output_register(enum nft_registers reg)
3732 if (reg < NFT_REG_VERDICT)
3734 if (reg > NFT_REG_MAX)
3738 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3741 * nft_validate_data_load - validate an expressions' data load
3743 * @ctx: context of the expression performing the load
3744 * @reg: the destination register number
3745 * @data: the data to load
3746 * @type: the data type
3748 * Validate that a data load uses the appropriate data type for
3749 * the destination register. A value of NULL for the data means
3750 * that its runtime gathered data, which is always of type
3753 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3754 const struct nft_data *data,
3755 enum nft_data_types type)
3760 case NFT_REG_VERDICT:
3761 if (data == NULL || type != NFT_DATA_VERDICT)
3764 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3765 err = nf_tables_check_loops(ctx, data->chain);
3769 if (ctx->chain->level + 1 > data->chain->level) {
3770 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3772 data->chain->level = ctx->chain->level + 1;
3778 if (data != NULL && type != NFT_DATA_VALUE)
3783 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3785 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3786 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3787 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3788 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3791 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3792 struct nft_data_desc *desc, const struct nlattr *nla)
3794 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3795 struct nft_chain *chain;
3798 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3802 if (!tb[NFTA_VERDICT_CODE])
3804 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3806 switch (data->verdict) {
3808 switch (data->verdict & NF_VERDICT_MASK) {
3820 desc->len = sizeof(data->verdict);
3824 if (!tb[NFTA_VERDICT_CHAIN])
3826 chain = nf_tables_chain_lookup(ctx->table,
3827 tb[NFTA_VERDICT_CHAIN]);
3829 return PTR_ERR(chain);
3830 if (chain->flags & NFT_BASE_CHAIN)
3834 data->chain = chain;
3835 desc->len = sizeof(data);
3839 desc->type = NFT_DATA_VERDICT;
3843 static void nft_verdict_uninit(const struct nft_data *data)
3845 switch (data->verdict) {
3853 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
3855 struct nlattr *nest;
3857 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
3859 goto nla_put_failure;
3861 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
3862 goto nla_put_failure;
3864 switch (data->verdict) {
3867 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
3868 goto nla_put_failure;
3870 nla_nest_end(skb, nest);
3877 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
3878 struct nft_data_desc *desc, const struct nlattr *nla)
3885 if (len > sizeof(data->data))
3888 nla_memcpy(data->data, nla, sizeof(data->data));
3889 desc->type = NFT_DATA_VALUE;
3894 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
3897 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
3900 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
3901 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
3902 .len = FIELD_SIZEOF(struct nft_data, data) },
3903 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
3907 * nft_data_init - parse nf_tables data netlink attributes
3909 * @ctx: context of the expression using the data
3910 * @data: destination struct nft_data
3911 * @desc: data description
3912 * @nla: netlink attribute containing data
3914 * Parse the netlink data attributes and initialize a struct nft_data.
3915 * The type and length of data are returned in the data description.
3917 * The caller can indicate that it only wants to accept data of type
3918 * NFT_DATA_VALUE by passing NULL for the ctx argument.
3920 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
3921 struct nft_data_desc *desc, const struct nlattr *nla)
3923 struct nlattr *tb[NFTA_DATA_MAX + 1];
3926 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
3930 if (tb[NFTA_DATA_VALUE])
3931 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
3932 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
3933 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
3936 EXPORT_SYMBOL_GPL(nft_data_init);
3939 * nft_data_uninit - release a nft_data item
3941 * @data: struct nft_data to release
3942 * @type: type of data
3944 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3945 * all others need to be released by calling this function.
3947 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
3950 case NFT_DATA_VALUE:
3952 case NFT_DATA_VERDICT:
3953 return nft_verdict_uninit(data);
3958 EXPORT_SYMBOL_GPL(nft_data_uninit);
3960 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
3961 enum nft_data_types type, unsigned int len)
3963 struct nlattr *nest;
3966 nest = nla_nest_start(skb, attr);
3971 case NFT_DATA_VALUE:
3972 err = nft_value_dump(skb, data, len);
3974 case NFT_DATA_VERDICT:
3975 err = nft_verdict_dump(skb, data);
3982 nla_nest_end(skb, nest);
3985 EXPORT_SYMBOL_GPL(nft_data_dump);
3987 static int nf_tables_init_net(struct net *net)
3989 INIT_LIST_HEAD(&net->nft.af_info);
3990 INIT_LIST_HEAD(&net->nft.commit_list);
3991 net->nft.base_seq = 1;
3995 static struct pernet_operations nf_tables_net_ops = {
3996 .init = nf_tables_init_net,
3999 static int __init nf_tables_module_init(void)
4003 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4010 err = nf_tables_core_module_init();
4014 err = nfnetlink_subsys_register(&nf_tables_subsys);
4018 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4019 return register_pernet_subsys(&nf_tables_net_ops);
4021 nf_tables_core_module_exit();
4028 static void __exit nf_tables_module_exit(void)
4030 unregister_pernet_subsys(&nf_tables_net_ops);
4031 nfnetlink_subsys_unregister(&nf_tables_subsys);
4032 nf_tables_core_module_exit();
4036 module_init(nf_tables_module_init);
4037 module_exit(nf_tables_module_exit);
4039 MODULE_LICENSE("GPL");
4040 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4041 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);