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(&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);
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;
280 list_for_each_entry(afi, &net->nft.af_info, list) {
281 if (family != NFPROTO_UNSPEC && family != afi->family)
284 list_for_each_entry(table, &afi->tables, list) {
288 memset(&cb->args[1], 0,
289 sizeof(cb->args) - sizeof(cb->args[0]));
290 if (nf_tables_fill_table_info(skb,
291 NETLINK_CB(cb->skb).portid,
295 afi->family, table) < 0)
306 /* Internal table flags */
307 #define NFT_TABLE_INACTIVE (1 << 15)
309 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
310 const struct nlmsghdr *nlh,
311 const struct nlattr * const nla[])
313 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
314 const struct nft_af_info *afi;
315 const struct nft_table *table;
316 struct sk_buff *skb2;
317 struct net *net = sock_net(skb->sk);
318 int family = nfmsg->nfgen_family;
321 if (nlh->nlmsg_flags & NLM_F_DUMP) {
322 struct netlink_dump_control c = {
323 .dump = nf_tables_dump_tables,
325 return netlink_dump_start(nlsk, skb, nlh, &c);
328 afi = nf_tables_afinfo_lookup(net, family, false);
332 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
334 return PTR_ERR(table);
335 if (table->flags & NFT_TABLE_INACTIVE)
338 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
342 err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid,
343 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
348 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
355 static int nf_tables_table_enable(const struct nft_af_info *afi,
356 struct nft_table *table)
358 struct nft_chain *chain;
361 list_for_each_entry(chain, &table->chains, list) {
362 if (!(chain->flags & NFT_BASE_CHAIN))
365 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
373 list_for_each_entry(chain, &table->chains, list) {
374 if (!(chain->flags & NFT_BASE_CHAIN))
380 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
385 static void nf_tables_table_disable(const struct nft_af_info *afi,
386 struct nft_table *table)
388 struct nft_chain *chain;
390 list_for_each_entry(chain, &table->chains, list) {
391 if (chain->flags & NFT_BASE_CHAIN)
392 nf_unregister_hooks(nft_base_chain(chain)->ops,
397 static int nf_tables_updtable(struct nft_ctx *ctx)
399 struct nft_trans *trans;
403 if (!ctx->nla[NFTA_TABLE_FLAGS])
406 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
407 if (flags & ~NFT_TABLE_F_DORMANT)
410 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
411 sizeof(struct nft_trans_table));
415 if ((flags & NFT_TABLE_F_DORMANT) &&
416 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
417 nft_trans_table_enable(trans) = false;
418 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
419 ctx->table->flags & NFT_TABLE_F_DORMANT) {
420 ret = nf_tables_table_enable(ctx->afi, ctx->table);
422 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
423 nft_trans_table_enable(trans) = true;
429 nft_trans_table_update(trans) = true;
430 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
433 nft_trans_destroy(trans);
437 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
439 struct nft_trans *trans;
441 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
445 if (msg_type == NFT_MSG_NEWTABLE)
446 ctx->table->flags |= NFT_TABLE_INACTIVE;
448 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
452 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
453 const struct nlmsghdr *nlh,
454 const struct nlattr * const nla[])
456 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
457 const struct nlattr *name;
458 struct nft_af_info *afi;
459 struct nft_table *table;
460 struct net *net = sock_net(skb->sk);
461 int family = nfmsg->nfgen_family;
466 afi = nf_tables_afinfo_lookup(net, family, true);
470 name = nla[NFTA_TABLE_NAME];
471 table = nf_tables_table_lookup(afi, name);
473 if (PTR_ERR(table) != -ENOENT)
474 return PTR_ERR(table);
479 if (table->flags & NFT_TABLE_INACTIVE)
481 if (nlh->nlmsg_flags & NLM_F_EXCL)
483 if (nlh->nlmsg_flags & NLM_F_REPLACE)
486 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
487 return nf_tables_updtable(&ctx);
490 if (nla[NFTA_TABLE_FLAGS]) {
491 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
492 if (flags & ~NFT_TABLE_F_DORMANT)
496 if (!try_module_get(afi->owner))
497 return -EAFNOSUPPORT;
499 table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL);
501 module_put(afi->owner);
505 nla_strlcpy(table->name, name, nla_len(name));
506 INIT_LIST_HEAD(&table->chains);
507 INIT_LIST_HEAD(&table->sets);
508 table->flags = flags;
510 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
511 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
514 module_put(afi->owner);
517 list_add_tail(&table->list, &afi->tables);
521 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
522 const struct nlmsghdr *nlh,
523 const struct nlattr * const nla[])
525 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
526 struct nft_af_info *afi;
527 struct nft_table *table;
528 struct net *net = sock_net(skb->sk);
529 int family = nfmsg->nfgen_family, err;
532 afi = nf_tables_afinfo_lookup(net, family, false);
536 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
538 return PTR_ERR(table);
539 if (table->flags & NFT_TABLE_INACTIVE)
544 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
545 err = nft_trans_table_add(&ctx, NFT_MSG_DELTABLE);
549 list_del(&table->list);
553 static void nf_tables_table_destroy(struct nft_ctx *ctx)
555 BUG_ON(ctx->table->use > 0);
558 module_put(ctx->afi->owner);
561 int nft_register_chain_type(const struct nf_chain_type *ctype)
565 nfnl_lock(NFNL_SUBSYS_NFTABLES);
566 if (chain_type[ctype->family][ctype->type] != NULL) {
570 chain_type[ctype->family][ctype->type] = ctype;
572 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
575 EXPORT_SYMBOL_GPL(nft_register_chain_type);
577 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
579 nfnl_lock(NFNL_SUBSYS_NFTABLES);
580 chain_type[ctype->family][ctype->type] = NULL;
581 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
583 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
589 static struct nft_chain *
590 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
592 struct nft_chain *chain;
594 list_for_each_entry(chain, &table->chains, list) {
595 if (chain->handle == handle)
599 return ERR_PTR(-ENOENT);
602 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
603 const struct nlattr *nla)
605 struct nft_chain *chain;
608 return ERR_PTR(-EINVAL);
610 list_for_each_entry(chain, &table->chains, list) {
611 if (!nla_strcmp(nla, chain->name))
615 return ERR_PTR(-ENOENT);
618 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
619 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
620 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
621 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
622 .len = NFT_CHAIN_MAXNAMELEN - 1 },
623 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
624 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
625 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
626 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
629 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
630 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
631 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
634 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
636 struct nft_stats *cpu_stats, total;
640 memset(&total, 0, sizeof(total));
641 for_each_possible_cpu(cpu) {
642 cpu_stats = per_cpu_ptr(stats, cpu);
643 total.pkts += cpu_stats->pkts;
644 total.bytes += cpu_stats->bytes;
646 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
648 goto nla_put_failure;
650 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
651 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
652 goto nla_put_failure;
654 nla_nest_end(skb, nest);
661 static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq,
662 int event, u32 flags, int family,
663 const struct nft_table *table,
664 const struct nft_chain *chain)
666 struct nlmsghdr *nlh;
667 struct nfgenmsg *nfmsg;
669 event |= NFNL_SUBSYS_NFTABLES << 8;
670 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
672 goto nla_put_failure;
674 nfmsg = nlmsg_data(nlh);
675 nfmsg->nfgen_family = family;
676 nfmsg->version = NFNETLINK_V0;
679 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
680 goto nla_put_failure;
681 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
682 goto nla_put_failure;
683 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
684 goto nla_put_failure;
686 if (chain->flags & NFT_BASE_CHAIN) {
687 const struct nft_base_chain *basechain = nft_base_chain(chain);
688 const struct nf_hook_ops *ops = &basechain->ops[0];
691 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
693 goto nla_put_failure;
694 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
695 goto nla_put_failure;
696 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
697 goto nla_put_failure;
698 nla_nest_end(skb, nest);
700 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
701 htonl(basechain->policy)))
702 goto nla_put_failure;
704 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
705 goto nla_put_failure;
707 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
708 goto nla_put_failure;
711 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
712 goto nla_put_failure;
714 return nlmsg_end(skb, nlh);
717 nlmsg_trim(skb, nlh);
721 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
727 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
731 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
735 err = nf_tables_fill_chain_info(skb, ctx->portid, ctx->seq, event, 0,
736 ctx->afi->family, ctx->table,
743 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
744 ctx->report, GFP_KERNEL);
747 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
753 static int nf_tables_dump_chains(struct sk_buff *skb,
754 struct netlink_callback *cb)
756 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
757 const struct nft_af_info *afi;
758 const struct nft_table *table;
759 const struct nft_chain *chain;
760 unsigned int idx = 0, s_idx = cb->args[0];
761 struct net *net = sock_net(skb->sk);
762 int family = nfmsg->nfgen_family;
764 list_for_each_entry(afi, &net->nft.af_info, list) {
765 if (family != NFPROTO_UNSPEC && family != afi->family)
768 list_for_each_entry(table, &afi->tables, list) {
769 list_for_each_entry(chain, &table->chains, list) {
773 memset(&cb->args[1], 0,
774 sizeof(cb->args) - sizeof(cb->args[0]));
775 if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid,
779 afi->family, table, chain) < 0)
792 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
793 const struct nlmsghdr *nlh,
794 const struct nlattr * const nla[])
796 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
797 const struct nft_af_info *afi;
798 const struct nft_table *table;
799 const struct nft_chain *chain;
800 struct sk_buff *skb2;
801 struct net *net = sock_net(skb->sk);
802 int family = nfmsg->nfgen_family;
805 if (nlh->nlmsg_flags & NLM_F_DUMP) {
806 struct netlink_dump_control c = {
807 .dump = nf_tables_dump_chains,
809 return netlink_dump_start(nlsk, skb, nlh, &c);
812 afi = nf_tables_afinfo_lookup(net, family, false);
816 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
818 return PTR_ERR(table);
819 if (table->flags & NFT_TABLE_INACTIVE)
822 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
824 return PTR_ERR(chain);
825 if (chain->flags & NFT_CHAIN_INACTIVE)
828 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
832 err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid,
833 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
834 family, table, chain);
838 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
845 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
846 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
847 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
850 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
852 struct nlattr *tb[NFTA_COUNTER_MAX+1];
853 struct nft_stats __percpu *newstats;
854 struct nft_stats *stats;
857 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
861 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
862 return ERR_PTR(-EINVAL);
864 newstats = alloc_percpu(struct nft_stats);
865 if (newstats == NULL)
866 return ERR_PTR(-ENOMEM);
868 /* Restore old counters on this cpu, no problem. Per-cpu statistics
869 * are not exposed to userspace.
871 stats = this_cpu_ptr(newstats);
872 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
873 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
878 static void nft_chain_stats_replace(struct nft_base_chain *chain,
879 struct nft_stats __percpu *newstats)
882 struct nft_stats __percpu *oldstats =
883 nft_dereference(chain->stats);
885 rcu_assign_pointer(chain->stats, newstats);
887 free_percpu(oldstats);
889 rcu_assign_pointer(chain->stats, newstats);
892 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
894 struct nft_trans *trans;
896 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
900 if (msg_type == NFT_MSG_NEWCHAIN)
901 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
903 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
907 static void nf_tables_chain_destroy(struct nft_chain *chain)
909 BUG_ON(chain->use > 0);
911 if (chain->flags & NFT_BASE_CHAIN) {
912 module_put(nft_base_chain(chain)->type->owner);
913 free_percpu(nft_base_chain(chain)->stats);
914 kfree(nft_base_chain(chain));
920 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
921 const struct nlmsghdr *nlh,
922 const struct nlattr * const nla[])
924 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
925 const struct nlattr * uninitialized_var(name);
926 struct nft_af_info *afi;
927 struct nft_table *table;
928 struct nft_chain *chain;
929 struct nft_base_chain *basechain = NULL;
930 struct nlattr *ha[NFTA_HOOK_MAX + 1];
931 struct net *net = sock_net(skb->sk);
932 int family = nfmsg->nfgen_family;
933 u8 policy = NF_ACCEPT;
936 struct nft_stats __percpu *stats;
941 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
943 afi = nf_tables_afinfo_lookup(net, family, true);
947 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
949 return PTR_ERR(table);
952 name = nla[NFTA_CHAIN_NAME];
954 if (nla[NFTA_CHAIN_HANDLE]) {
955 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
956 chain = nf_tables_chain_lookup_byhandle(table, handle);
958 return PTR_ERR(chain);
960 chain = nf_tables_chain_lookup(table, name);
962 if (PTR_ERR(chain) != -ENOENT)
963 return PTR_ERR(chain);
968 if (nla[NFTA_CHAIN_POLICY]) {
969 if ((chain != NULL &&
970 !(chain->flags & NFT_BASE_CHAIN)) ||
971 nla[NFTA_CHAIN_HOOK] == NULL)
974 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
985 struct nft_stats *stats = NULL;
986 struct nft_trans *trans;
988 if (chain->flags & NFT_CHAIN_INACTIVE)
990 if (nlh->nlmsg_flags & NLM_F_EXCL)
992 if (nlh->nlmsg_flags & NLM_F_REPLACE)
995 if (nla[NFTA_CHAIN_HANDLE] && name &&
996 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
999 if (nla[NFTA_CHAIN_COUNTERS]) {
1000 if (!(chain->flags & NFT_BASE_CHAIN))
1003 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1005 return PTR_ERR(stats);
1008 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1009 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1010 sizeof(struct nft_trans_chain));
1014 nft_trans_chain_stats(trans) = stats;
1015 nft_trans_chain_update(trans) = true;
1017 if (nla[NFTA_CHAIN_POLICY])
1018 nft_trans_chain_policy(trans) = policy;
1020 nft_trans_chain_policy(trans) = -1;
1022 if (nla[NFTA_CHAIN_HANDLE] && name) {
1023 nla_strlcpy(nft_trans_chain_name(trans), name,
1024 NFT_CHAIN_MAXNAMELEN);
1026 list_add_tail(&trans->list, &net->nft.commit_list);
1030 if (table->use == UINT_MAX)
1033 if (nla[NFTA_CHAIN_HOOK]) {
1034 const struct nf_chain_type *type;
1035 struct nf_hook_ops *ops;
1037 u32 hooknum, priority;
1039 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1040 if (nla[NFTA_CHAIN_TYPE]) {
1041 type = nf_tables_chain_type_lookup(afi,
1042 nla[NFTA_CHAIN_TYPE],
1045 return PTR_ERR(type);
1048 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1052 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1053 ha[NFTA_HOOK_PRIORITY] == NULL)
1056 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1057 if (hooknum >= afi->nhooks)
1059 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1061 if (!(type->hook_mask & (1 << hooknum)))
1063 if (!try_module_get(type->owner))
1065 hookfn = type->hooks[hooknum];
1067 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1068 if (basechain == NULL)
1071 if (nla[NFTA_CHAIN_COUNTERS]) {
1072 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1073 if (IS_ERR(stats)) {
1074 module_put(type->owner);
1076 return PTR_ERR(stats);
1078 basechain->stats = stats;
1080 stats = alloc_percpu(struct nft_stats);
1081 if (IS_ERR(stats)) {
1082 module_put(type->owner);
1084 return PTR_ERR(stats);
1086 rcu_assign_pointer(basechain->stats, stats);
1089 basechain->type = type;
1090 chain = &basechain->chain;
1092 for (i = 0; i < afi->nops; i++) {
1093 ops = &basechain->ops[i];
1095 ops->owner = afi->owner;
1096 ops->hooknum = hooknum;
1097 ops->priority = priority;
1099 ops->hook = afi->hooks[ops->hooknum];
1102 if (afi->hook_ops_init)
1103 afi->hook_ops_init(ops, i);
1106 chain->flags |= NFT_BASE_CHAIN;
1107 basechain->policy = policy;
1109 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1114 INIT_LIST_HEAD(&chain->rules);
1115 chain->handle = nf_tables_alloc_handle(table);
1117 chain->table = table;
1118 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1120 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1121 chain->flags & NFT_BASE_CHAIN) {
1122 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1127 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1128 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1133 list_add_tail(&chain->list, &table->chains);
1136 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1137 chain->flags & NFT_BASE_CHAIN) {
1138 nf_unregister_hooks(nft_base_chain(chain)->ops,
1142 nf_tables_chain_destroy(chain);
1146 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1147 const struct nlmsghdr *nlh,
1148 const struct nlattr * const nla[])
1150 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1151 struct nft_af_info *afi;
1152 struct nft_table *table;
1153 struct nft_chain *chain;
1154 struct net *net = sock_net(skb->sk);
1155 int family = nfmsg->nfgen_family;
1159 afi = nf_tables_afinfo_lookup(net, family, false);
1161 return PTR_ERR(afi);
1163 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1165 return PTR_ERR(table);
1166 if (table->flags & NFT_TABLE_INACTIVE)
1169 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1171 return PTR_ERR(chain);
1172 if (chain->flags & NFT_CHAIN_INACTIVE)
1177 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1178 err = nft_trans_chain_add(&ctx, NFT_MSG_DELCHAIN);
1183 list_del(&chain->list);
1192 * nft_register_expr - register nf_tables expr type
1195 * Registers the expr type for use with nf_tables. Returns zero on
1196 * success or a negative errno code otherwise.
1198 int nft_register_expr(struct nft_expr_type *type)
1200 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1201 if (type->family == NFPROTO_UNSPEC)
1202 list_add_tail(&type->list, &nf_tables_expressions);
1204 list_add(&type->list, &nf_tables_expressions);
1205 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1208 EXPORT_SYMBOL_GPL(nft_register_expr);
1211 * nft_unregister_expr - unregister nf_tables expr type
1214 * Unregisters the expr typefor use with nf_tables.
1216 void nft_unregister_expr(struct nft_expr_type *type)
1218 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1219 list_del(&type->list);
1220 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1222 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1224 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1227 const struct nft_expr_type *type;
1229 list_for_each_entry(type, &nf_tables_expressions, list) {
1230 if (!nla_strcmp(nla, type->name) &&
1231 (!type->family || type->family == family))
1237 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1240 const struct nft_expr_type *type;
1243 return ERR_PTR(-EINVAL);
1245 type = __nft_expr_type_get(family, nla);
1246 if (type != NULL && try_module_get(type->owner))
1249 #ifdef CONFIG_MODULES
1251 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1252 request_module("nft-expr-%u-%.*s", family,
1253 nla_len(nla), (char *)nla_data(nla));
1254 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1255 if (__nft_expr_type_get(family, nla))
1256 return ERR_PTR(-EAGAIN);
1258 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1259 request_module("nft-expr-%.*s",
1260 nla_len(nla), (char *)nla_data(nla));
1261 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1262 if (__nft_expr_type_get(family, nla))
1263 return ERR_PTR(-EAGAIN);
1266 return ERR_PTR(-ENOENT);
1269 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1270 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1271 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1274 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1275 const struct nft_expr *expr)
1277 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1278 goto nla_put_failure;
1280 if (expr->ops->dump) {
1281 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1283 goto nla_put_failure;
1284 if (expr->ops->dump(skb, expr) < 0)
1285 goto nla_put_failure;
1286 nla_nest_end(skb, data);
1295 struct nft_expr_info {
1296 const struct nft_expr_ops *ops;
1297 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1300 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1301 const struct nlattr *nla,
1302 struct nft_expr_info *info)
1304 const struct nft_expr_type *type;
1305 const struct nft_expr_ops *ops;
1306 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1309 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1313 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1315 return PTR_ERR(type);
1317 if (tb[NFTA_EXPR_DATA]) {
1318 err = nla_parse_nested(info->tb, type->maxattr,
1319 tb[NFTA_EXPR_DATA], type->policy);
1323 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1325 if (type->select_ops != NULL) {
1326 ops = type->select_ops(ctx,
1327 (const struct nlattr * const *)info->tb);
1339 module_put(type->owner);
1343 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1344 const struct nft_expr_info *info,
1345 struct nft_expr *expr)
1347 const struct nft_expr_ops *ops = info->ops;
1352 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1364 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1365 struct nft_expr *expr)
1367 if (expr->ops->destroy)
1368 expr->ops->destroy(ctx, expr);
1369 module_put(expr->ops->type->owner);
1376 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1379 struct nft_rule *rule;
1381 // FIXME: this sucks
1382 list_for_each_entry(rule, &chain->rules, list) {
1383 if (handle == rule->handle)
1387 return ERR_PTR(-ENOENT);
1390 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1391 const struct nlattr *nla)
1394 return ERR_PTR(-EINVAL);
1396 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1399 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1400 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1401 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1402 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1403 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1404 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1405 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1406 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1407 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1408 .len = NFT_USERDATA_MAXLEN },
1411 static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq,
1412 int event, u32 flags, int family,
1413 const struct nft_table *table,
1414 const struct nft_chain *chain,
1415 const struct nft_rule *rule)
1417 struct nlmsghdr *nlh;
1418 struct nfgenmsg *nfmsg;
1419 const struct nft_expr *expr, *next;
1420 struct nlattr *list;
1421 const struct nft_rule *prule;
1422 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1424 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1427 goto nla_put_failure;
1429 nfmsg = nlmsg_data(nlh);
1430 nfmsg->nfgen_family = family;
1431 nfmsg->version = NFNETLINK_V0;
1434 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1435 goto nla_put_failure;
1436 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1437 goto nla_put_failure;
1438 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1439 goto nla_put_failure;
1441 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1442 prule = list_entry(rule->list.prev, struct nft_rule, list);
1443 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1444 cpu_to_be64(prule->handle)))
1445 goto nla_put_failure;
1448 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1450 goto nla_put_failure;
1451 nft_rule_for_each_expr(expr, next, rule) {
1452 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1454 goto nla_put_failure;
1455 if (nf_tables_fill_expr_info(skb, expr) < 0)
1456 goto nla_put_failure;
1457 nla_nest_end(skb, elem);
1459 nla_nest_end(skb, list);
1462 nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule)))
1463 goto nla_put_failure;
1465 return nlmsg_end(skb, nlh);
1468 nlmsg_trim(skb, nlh);
1472 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1473 const struct nft_rule *rule,
1476 struct sk_buff *skb;
1480 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1484 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1488 err = nf_tables_fill_rule_info(skb, ctx->portid, ctx->seq, event, 0,
1489 ctx->afi->family, ctx->table,
1496 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1497 ctx->report, GFP_KERNEL);
1500 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1507 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
1509 return (rule->genmask & (1 << net->nft.gencursor)) == 0;
1512 static inline int gencursor_next(struct net *net)
1514 return net->nft.gencursor+1 == 1 ? 1 : 0;
1518 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
1520 return (rule->genmask & (1 << gencursor_next(net))) == 0;
1524 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
1526 /* Now inactive, will be active in the future */
1527 rule->genmask = (1 << net->nft.gencursor);
1531 nft_rule_disactivate_next(struct net *net, struct nft_rule *rule)
1533 rule->genmask = (1 << gencursor_next(net));
1536 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
1541 static int nf_tables_dump_rules(struct sk_buff *skb,
1542 struct netlink_callback *cb)
1544 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1545 const struct nft_af_info *afi;
1546 const struct nft_table *table;
1547 const struct nft_chain *chain;
1548 const struct nft_rule *rule;
1549 unsigned int idx = 0, s_idx = cb->args[0];
1550 struct net *net = sock_net(skb->sk);
1551 int family = nfmsg->nfgen_family;
1552 u8 genctr = ACCESS_ONCE(net->nft.genctr);
1553 u8 gencursor = ACCESS_ONCE(net->nft.gencursor);
1555 list_for_each_entry(afi, &net->nft.af_info, list) {
1556 if (family != NFPROTO_UNSPEC && family != afi->family)
1559 list_for_each_entry(table, &afi->tables, list) {
1560 list_for_each_entry(chain, &table->chains, list) {
1561 list_for_each_entry(rule, &chain->rules, list) {
1562 if (!nft_rule_is_active(net, rule))
1567 memset(&cb->args[1], 0,
1568 sizeof(cb->args) - sizeof(cb->args[0]));
1569 if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid,
1572 NLM_F_MULTI | NLM_F_APPEND,
1573 afi->family, table, chain, rule) < 0)
1582 /* Invalidate this dump, a transition to the new generation happened */
1583 if (gencursor != net->nft.gencursor || genctr != net->nft.genctr)
1590 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1591 const struct nlmsghdr *nlh,
1592 const struct nlattr * const nla[])
1594 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1595 const struct nft_af_info *afi;
1596 const struct nft_table *table;
1597 const struct nft_chain *chain;
1598 const struct nft_rule *rule;
1599 struct sk_buff *skb2;
1600 struct net *net = sock_net(skb->sk);
1601 int family = nfmsg->nfgen_family;
1604 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1605 struct netlink_dump_control c = {
1606 .dump = nf_tables_dump_rules,
1608 return netlink_dump_start(nlsk, skb, nlh, &c);
1611 afi = nf_tables_afinfo_lookup(net, family, false);
1613 return PTR_ERR(afi);
1615 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1617 return PTR_ERR(table);
1618 if (table->flags & NFT_TABLE_INACTIVE)
1621 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1623 return PTR_ERR(chain);
1624 if (chain->flags & NFT_CHAIN_INACTIVE)
1627 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1629 return PTR_ERR(rule);
1631 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1635 err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid,
1636 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1637 family, table, chain, rule);
1641 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1648 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1649 struct nft_rule *rule)
1651 struct nft_expr *expr;
1654 * Careful: some expressions might not be initialized in case this
1655 * is called on error from nf_tables_newrule().
1657 expr = nft_expr_first(rule);
1658 while (expr->ops && expr != nft_expr_last(rule)) {
1659 nf_tables_expr_destroy(ctx, expr);
1660 expr = nft_expr_next(expr);
1665 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
1666 struct nft_rule *rule)
1668 struct nft_trans *trans;
1670 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
1674 nft_trans_rule(trans) = rule;
1675 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1680 #define NFT_RULE_MAXEXPRS 128
1682 static struct nft_expr_info *info;
1684 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1685 const struct nlmsghdr *nlh,
1686 const struct nlattr * const nla[])
1688 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1689 struct nft_af_info *afi;
1690 struct net *net = sock_net(skb->sk);
1691 struct nft_table *table;
1692 struct nft_chain *chain;
1693 struct nft_rule *rule, *old_rule = NULL;
1694 struct nft_trans *trans = NULL;
1695 struct nft_expr *expr;
1698 unsigned int size, i, n, ulen = 0;
1701 u64 handle, pos_handle;
1703 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1705 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1707 return PTR_ERR(afi);
1709 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1711 return PTR_ERR(table);
1713 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1715 return PTR_ERR(chain);
1717 if (nla[NFTA_RULE_HANDLE]) {
1718 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1719 rule = __nf_tables_rule_lookup(chain, handle);
1721 return PTR_ERR(rule);
1723 if (nlh->nlmsg_flags & NLM_F_EXCL)
1725 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1730 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1732 handle = nf_tables_alloc_handle(table);
1734 if (chain->use == UINT_MAX)
1738 if (nla[NFTA_RULE_POSITION]) {
1739 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1742 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1743 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1744 if (IS_ERR(old_rule))
1745 return PTR_ERR(old_rule);
1748 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1752 if (nla[NFTA_RULE_EXPRESSIONS]) {
1753 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1755 if (nla_type(tmp) != NFTA_LIST_ELEM)
1757 if (n == NFT_RULE_MAXEXPRS)
1759 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1762 size += info[n].ops->size;
1767 if (nla[NFTA_RULE_USERDATA])
1768 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
1771 rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL);
1775 nft_rule_activate_next(net, rule);
1777 rule->handle = handle;
1782 nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen);
1784 expr = nft_expr_first(rule);
1785 for (i = 0; i < n; i++) {
1786 err = nf_tables_newexpr(&ctx, &info[i], expr);
1790 expr = nft_expr_next(expr);
1793 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
1794 if (nft_rule_is_active_next(net, old_rule)) {
1795 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
1797 if (trans == NULL) {
1801 nft_rule_disactivate_next(net, old_rule);
1803 list_add_tail_rcu(&rule->list, &old_rule->list);
1808 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
1810 list_add_rcu(&rule->list, &old_rule->list);
1812 list_add_tail_rcu(&rule->list, &chain->rules);
1815 list_add_tail_rcu(&rule->list, &old_rule->list);
1817 list_add_rcu(&rule->list, &chain->rules);
1820 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
1828 list_del_rcu(&rule->list);
1830 list_del_rcu(&nft_trans_rule(trans)->list);
1831 nft_rule_clear(net, nft_trans_rule(trans));
1832 nft_trans_destroy(trans);
1836 nf_tables_rule_destroy(&ctx, rule);
1838 for (i = 0; i < n; i++) {
1839 if (info[i].ops != NULL)
1840 module_put(info[i].ops->type->owner);
1846 nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule)
1848 /* You cannot delete the same rule twice */
1849 if (nft_rule_is_active_next(ctx->net, rule)) {
1850 if (nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule) == NULL)
1852 nft_rule_disactivate_next(ctx->net, rule);
1859 static int nf_table_delrule_by_chain(struct nft_ctx *ctx)
1861 struct nft_rule *rule;
1864 list_for_each_entry(rule, &ctx->chain->rules, list) {
1865 err = nf_tables_delrule_one(ctx, rule);
1872 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
1873 const struct nlmsghdr *nlh,
1874 const struct nlattr * const nla[])
1876 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1877 struct nft_af_info *afi;
1878 struct net *net = sock_net(skb->sk);
1879 struct nft_table *table;
1880 struct nft_chain *chain = NULL;
1881 struct nft_rule *rule;
1882 int family = nfmsg->nfgen_family, err = 0;
1885 afi = nf_tables_afinfo_lookup(net, family, false);
1887 return PTR_ERR(afi);
1889 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1891 return PTR_ERR(table);
1892 if (table->flags & NFT_TABLE_INACTIVE)
1895 if (nla[NFTA_RULE_CHAIN]) {
1896 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1898 return PTR_ERR(chain);
1901 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1904 if (nla[NFTA_RULE_HANDLE]) {
1905 rule = nf_tables_rule_lookup(chain,
1906 nla[NFTA_RULE_HANDLE]);
1908 return PTR_ERR(rule);
1910 err = nf_tables_delrule_one(&ctx, rule);
1912 err = nf_table_delrule_by_chain(&ctx);
1915 list_for_each_entry(chain, &table->chains, list) {
1917 err = nf_table_delrule_by_chain(&ctx);
1930 static LIST_HEAD(nf_tables_set_ops);
1932 int nft_register_set(struct nft_set_ops *ops)
1934 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1935 list_add_tail(&ops->list, &nf_tables_set_ops);
1936 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1939 EXPORT_SYMBOL_GPL(nft_register_set);
1941 void nft_unregister_set(struct nft_set_ops *ops)
1943 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1944 list_del(&ops->list);
1945 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1947 EXPORT_SYMBOL_GPL(nft_unregister_set);
1950 * Select a set implementation based on the data characteristics and the
1951 * given policy. The total memory use might not be known if no size is
1952 * given, in that case the amount of memory per element is used.
1954 static const struct nft_set_ops *
1955 nft_select_set_ops(const struct nlattr * const nla[],
1956 const struct nft_set_desc *desc,
1957 enum nft_set_policies policy)
1959 const struct nft_set_ops *ops, *bops;
1960 struct nft_set_estimate est, best;
1963 #ifdef CONFIG_MODULES
1964 if (list_empty(&nf_tables_set_ops)) {
1965 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1966 request_module("nft-set");
1967 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1968 if (!list_empty(&nf_tables_set_ops))
1969 return ERR_PTR(-EAGAIN);
1973 if (nla[NFTA_SET_FLAGS] != NULL) {
1974 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
1975 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
1982 list_for_each_entry(ops, &nf_tables_set_ops, list) {
1983 if ((ops->features & features) != features)
1985 if (!ops->estimate(desc, features, &est))
1989 case NFT_SET_POL_PERFORMANCE:
1990 if (est.class < best.class)
1992 if (est.class == best.class && est.size < best.size)
1995 case NFT_SET_POL_MEMORY:
1996 if (est.size < best.size)
1998 if (est.size == best.size && est.class < best.class)
2005 if (!try_module_get(ops->owner))
2008 module_put(bops->owner);
2017 return ERR_PTR(-EOPNOTSUPP);
2020 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2021 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2022 [NFTA_SET_NAME] = { .type = NLA_STRING,
2023 .len = IFNAMSIZ - 1 },
2024 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2025 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2026 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2027 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2028 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2029 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2030 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2031 [NFTA_SET_ID] = { .type = NLA_U32 },
2034 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2035 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2038 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2039 const struct sk_buff *skb,
2040 const struct nlmsghdr *nlh,
2041 const struct nlattr * const nla[])
2043 struct net *net = sock_net(skb->sk);
2044 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2045 struct nft_af_info *afi = NULL;
2046 struct nft_table *table = NULL;
2048 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2049 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2051 return PTR_ERR(afi);
2054 if (nla[NFTA_SET_TABLE] != NULL) {
2056 return -EAFNOSUPPORT;
2058 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2060 return PTR_ERR(table);
2061 if (table->flags & NFT_TABLE_INACTIVE)
2065 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2069 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2070 const struct nlattr *nla)
2072 struct nft_set *set;
2075 return ERR_PTR(-EINVAL);
2077 list_for_each_entry(set, &table->sets, list) {
2078 if (!nla_strcmp(nla, set->name))
2081 return ERR_PTR(-ENOENT);
2084 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2085 const struct nlattr *nla)
2087 struct nft_trans *trans;
2088 u32 id = ntohl(nla_get_be32(nla));
2090 list_for_each_entry(trans, &net->nft.commit_list, list) {
2091 if (trans->msg_type == NFT_MSG_NEWSET &&
2092 id == nft_trans_set_id(trans))
2093 return nft_trans_set(trans);
2095 return ERR_PTR(-ENOENT);
2098 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2101 const struct nft_set *i;
2103 unsigned long *inuse;
2104 unsigned int n = 0, min = 0;
2106 p = strnchr(name, IFNAMSIZ, '%');
2108 if (p[1] != 'd' || strchr(p + 2, '%'))
2111 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2115 list_for_each_entry(i, &ctx->table->sets, list) {
2118 if (!sscanf(i->name, name, &tmp))
2120 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2123 set_bit(tmp - min, inuse);
2126 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2127 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2128 min += BITS_PER_BYTE * PAGE_SIZE;
2129 memset(inuse, 0, PAGE_SIZE);
2132 free_page((unsigned long)inuse);
2135 snprintf(set->name, sizeof(set->name), name, min + n);
2136 list_for_each_entry(i, &ctx->table->sets, list) {
2137 if (!strcmp(set->name, i->name))
2143 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2144 const struct nft_set *set, u16 event, u16 flags)
2146 struct nfgenmsg *nfmsg;
2147 struct nlmsghdr *nlh;
2148 struct nlattr *desc;
2149 u32 portid = ctx->portid;
2152 event |= NFNL_SUBSYS_NFTABLES << 8;
2153 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2156 goto nla_put_failure;
2158 nfmsg = nlmsg_data(nlh);
2159 nfmsg->nfgen_family = ctx->afi->family;
2160 nfmsg->version = NFNETLINK_V0;
2163 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2164 goto nla_put_failure;
2165 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2166 goto nla_put_failure;
2167 if (set->flags != 0)
2168 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2169 goto nla_put_failure;
2171 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2172 goto nla_put_failure;
2173 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2174 goto nla_put_failure;
2175 if (set->flags & NFT_SET_MAP) {
2176 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2177 goto nla_put_failure;
2178 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2179 goto nla_put_failure;
2182 desc = nla_nest_start(skb, NFTA_SET_DESC);
2184 goto nla_put_failure;
2186 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2187 goto nla_put_failure;
2188 nla_nest_end(skb, desc);
2190 return nlmsg_end(skb, nlh);
2193 nlmsg_trim(skb, nlh);
2197 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2198 const struct nft_set *set,
2199 int event, gfp_t gfp_flags)
2201 struct sk_buff *skb;
2202 u32 portid = ctx->portid;
2206 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2210 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2214 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2220 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2221 ctx->report, gfp_flags);
2224 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2228 static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb,
2229 struct netlink_callback *cb)
2231 const struct nft_set *set;
2232 unsigned int idx = 0, s_idx = cb->args[0];
2237 list_for_each_entry(set, &ctx->table->sets, list) {
2240 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2253 static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb,
2254 struct netlink_callback *cb)
2256 const struct nft_set *set;
2257 unsigned int idx, s_idx = cb->args[0];
2258 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2263 list_for_each_entry(table, &ctx->afi->tables, list) {
2265 if (cur_table != table)
2272 list_for_each_entry(set, &ctx->table->sets, list) {
2275 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2278 cb->args[2] = (unsigned long) table;
2290 static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb,
2291 struct netlink_callback *cb)
2293 const struct nft_set *set;
2294 unsigned int idx, s_idx = cb->args[0];
2295 struct nft_af_info *afi;
2296 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2297 struct net *net = sock_net(skb->sk);
2298 int cur_family = cb->args[3];
2303 list_for_each_entry(afi, &net->nft.af_info, list) {
2305 if (afi->family != cur_family)
2311 list_for_each_entry(table, &afi->tables, list) {
2313 if (cur_table != table)
2322 list_for_each_entry(set, &ctx->table->sets, list) {
2325 if (nf_tables_fill_set(skb, ctx, set,
2329 cb->args[2] = (unsigned long) table;
2330 cb->args[3] = afi->family;
2345 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2347 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2348 struct nlattr *nla[NFTA_SET_MAX + 1];
2352 err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX,
2357 err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla);
2361 if (ctx.table == NULL) {
2362 if (ctx.afi == NULL)
2363 ret = nf_tables_dump_sets_all(&ctx, skb, cb);
2365 ret = nf_tables_dump_sets_family(&ctx, skb, cb);
2367 ret = nf_tables_dump_sets_table(&ctx, skb, cb);
2372 #define NFT_SET_INACTIVE (1 << 15) /* Internal set flag */
2374 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2375 const struct nlmsghdr *nlh,
2376 const struct nlattr * const nla[])
2378 const struct nft_set *set;
2380 struct sk_buff *skb2;
2381 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2384 /* Verify existance before starting dump */
2385 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2389 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2390 struct netlink_dump_control c = {
2391 .dump = nf_tables_dump_sets,
2393 return netlink_dump_start(nlsk, skb, nlh, &c);
2396 /* Only accept unspec with dump */
2397 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2398 return -EAFNOSUPPORT;
2400 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2402 return PTR_ERR(set);
2403 if (set->flags & NFT_SET_INACTIVE)
2406 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2410 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2414 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2421 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2422 struct nft_set_desc *desc,
2423 const struct nlattr *nla)
2425 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2428 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2432 if (da[NFTA_SET_DESC_SIZE] != NULL)
2433 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2438 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
2439 struct nft_set *set)
2441 struct nft_trans *trans;
2443 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
2447 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
2448 nft_trans_set_id(trans) =
2449 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
2450 set->flags |= NFT_SET_INACTIVE;
2452 nft_trans_set(trans) = set;
2453 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2458 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2459 const struct nlmsghdr *nlh,
2460 const struct nlattr * const nla[])
2462 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2463 const struct nft_set_ops *ops;
2464 struct nft_af_info *afi;
2465 struct net *net = sock_net(skb->sk);
2466 struct nft_table *table;
2467 struct nft_set *set;
2469 char name[IFNAMSIZ];
2472 u32 ktype, dtype, flags, policy;
2473 struct nft_set_desc desc;
2476 if (nla[NFTA_SET_TABLE] == NULL ||
2477 nla[NFTA_SET_NAME] == NULL ||
2478 nla[NFTA_SET_KEY_LEN] == NULL ||
2479 nla[NFTA_SET_ID] == NULL)
2482 memset(&desc, 0, sizeof(desc));
2484 ktype = NFT_DATA_VALUE;
2485 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2486 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2487 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2491 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2492 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2496 if (nla[NFTA_SET_FLAGS] != NULL) {
2497 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2498 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2499 NFT_SET_INTERVAL | NFT_SET_MAP))
2504 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2505 if (!(flags & NFT_SET_MAP))
2508 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2509 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2510 dtype != NFT_DATA_VERDICT)
2513 if (dtype != NFT_DATA_VERDICT) {
2514 if (nla[NFTA_SET_DATA_LEN] == NULL)
2516 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2517 if (desc.dlen == 0 ||
2518 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2521 desc.dlen = sizeof(struct nft_data);
2522 } else if (flags & NFT_SET_MAP)
2525 policy = NFT_SET_POL_PERFORMANCE;
2526 if (nla[NFTA_SET_POLICY] != NULL)
2527 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2529 if (nla[NFTA_SET_DESC] != NULL) {
2530 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2535 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2537 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2539 return PTR_ERR(afi);
2541 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2543 return PTR_ERR(table);
2545 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2547 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2549 if (PTR_ERR(set) != -ENOENT)
2550 return PTR_ERR(set);
2555 if (nlh->nlmsg_flags & NLM_F_EXCL)
2557 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2562 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2565 ops = nft_select_set_ops(nla, &desc, policy);
2567 return PTR_ERR(ops);
2570 if (ops->privsize != NULL)
2571 size = ops->privsize(nla);
2574 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2578 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2579 err = nf_tables_set_alloc_name(&ctx, set, name);
2583 INIT_LIST_HEAD(&set->bindings);
2586 set->klen = desc.klen;
2588 set->dlen = desc.dlen;
2590 set->size = desc.size;
2592 err = ops->init(set, &desc, nla);
2596 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2600 list_add_tail(&set->list, &table->sets);
2607 module_put(ops->owner);
2611 static void nft_set_destroy(struct nft_set *set)
2613 set->ops->destroy(set);
2614 module_put(set->ops->owner);
2618 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2620 list_del(&set->list);
2621 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2622 nft_set_destroy(set);
2625 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2626 const struct nlmsghdr *nlh,
2627 const struct nlattr * const nla[])
2629 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2630 struct nft_set *set;
2634 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2635 return -EAFNOSUPPORT;
2636 if (nla[NFTA_SET_TABLE] == NULL)
2639 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2643 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2645 return PTR_ERR(set);
2646 if (set->flags & NFT_SET_INACTIVE)
2648 if (!list_empty(&set->bindings))
2651 err = nft_trans_set_add(&ctx, NFT_MSG_DELSET, set);
2655 list_del(&set->list);
2660 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2661 const struct nft_set *set,
2662 const struct nft_set_iter *iter,
2663 const struct nft_set_elem *elem)
2665 enum nft_registers dreg;
2667 dreg = nft_type_to_reg(set->dtype);
2668 return nft_validate_data_load(ctx, dreg, &elem->data,
2669 set->dtype == NFT_DATA_VERDICT ?
2670 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2673 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2674 struct nft_set_binding *binding)
2676 struct nft_set_binding *i;
2677 struct nft_set_iter iter;
2679 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2682 if (set->flags & NFT_SET_MAP) {
2683 /* If the set is already bound to the same chain all
2684 * jumps are already validated for that chain.
2686 list_for_each_entry(i, &set->bindings, list) {
2687 if (i->chain == binding->chain)
2694 iter.fn = nf_tables_bind_check_setelem;
2696 set->ops->walk(ctx, set, &iter);
2698 /* Destroy anonymous sets if binding fails */
2699 if (set->flags & NFT_SET_ANONYMOUS)
2700 nf_tables_set_destroy(ctx, set);
2706 binding->chain = ctx->chain;
2707 list_add_tail(&binding->list, &set->bindings);
2711 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2712 struct nft_set_binding *binding)
2714 list_del(&binding->list);
2716 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2717 !(set->flags & NFT_SET_INACTIVE))
2718 nf_tables_set_destroy(ctx, set);
2725 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2726 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2727 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2728 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2731 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2732 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2733 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2734 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2735 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2738 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2739 const struct sk_buff *skb,
2740 const struct nlmsghdr *nlh,
2741 const struct nlattr * const nla[],
2744 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2745 struct nft_af_info *afi;
2746 struct nft_table *table;
2747 struct net *net = sock_net(skb->sk);
2749 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2751 return PTR_ERR(afi);
2753 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2755 return PTR_ERR(table);
2756 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2759 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2763 static int nf_tables_fill_setelem(struct sk_buff *skb,
2764 const struct nft_set *set,
2765 const struct nft_set_elem *elem)
2767 unsigned char *b = skb_tail_pointer(skb);
2768 struct nlattr *nest;
2770 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2772 goto nla_put_failure;
2774 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2776 goto nla_put_failure;
2778 if (set->flags & NFT_SET_MAP &&
2779 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2780 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2781 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2783 goto nla_put_failure;
2785 if (elem->flags != 0)
2786 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2787 goto nla_put_failure;
2789 nla_nest_end(skb, nest);
2797 struct nft_set_dump_args {
2798 const struct netlink_callback *cb;
2799 struct nft_set_iter iter;
2800 struct sk_buff *skb;
2803 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2804 const struct nft_set *set,
2805 const struct nft_set_iter *iter,
2806 const struct nft_set_elem *elem)
2808 struct nft_set_dump_args *args;
2810 args = container_of(iter, struct nft_set_dump_args, iter);
2811 return nf_tables_fill_setelem(args->skb, set, elem);
2814 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2816 const struct nft_set *set;
2817 struct nft_set_dump_args args;
2819 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2820 struct nfgenmsg *nfmsg;
2821 struct nlmsghdr *nlh;
2822 struct nlattr *nest;
2826 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2827 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2831 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
2836 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2838 return PTR_ERR(set);
2839 if (set->flags & NFT_SET_INACTIVE)
2842 event = NFT_MSG_NEWSETELEM;
2843 event |= NFNL_SUBSYS_NFTABLES << 8;
2844 portid = NETLINK_CB(cb->skb).portid;
2845 seq = cb->nlh->nlmsg_seq;
2847 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2850 goto nla_put_failure;
2852 nfmsg = nlmsg_data(nlh);
2853 nfmsg->nfgen_family = ctx.afi->family;
2854 nfmsg->version = NFNETLINK_V0;
2857 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2858 goto nla_put_failure;
2859 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2860 goto nla_put_failure;
2862 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2864 goto nla_put_failure;
2868 args.iter.skip = cb->args[0];
2869 args.iter.count = 0;
2871 args.iter.fn = nf_tables_dump_setelem;
2872 set->ops->walk(&ctx, set, &args.iter);
2874 nla_nest_end(skb, nest);
2875 nlmsg_end(skb, nlh);
2877 if (args.iter.err && args.iter.err != -EMSGSIZE)
2878 return args.iter.err;
2879 if (args.iter.count == cb->args[0])
2882 cb->args[0] = args.iter.count;
2889 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2890 const struct nlmsghdr *nlh,
2891 const struct nlattr * const nla[])
2893 const struct nft_set *set;
2897 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
2901 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2903 return PTR_ERR(set);
2904 if (set->flags & NFT_SET_INACTIVE)
2907 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2908 struct netlink_dump_control c = {
2909 .dump = nf_tables_dump_set,
2911 return netlink_dump_start(nlsk, skb, nlh, &c);
2916 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
2917 const struct nft_ctx *ctx, u32 seq,
2918 u32 portid, int event, u16 flags,
2919 const struct nft_set *set,
2920 const struct nft_set_elem *elem)
2922 struct nfgenmsg *nfmsg;
2923 struct nlmsghdr *nlh;
2924 struct nlattr *nest;
2927 event |= NFNL_SUBSYS_NFTABLES << 8;
2928 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2931 goto nla_put_failure;
2933 nfmsg = nlmsg_data(nlh);
2934 nfmsg->nfgen_family = ctx->afi->family;
2935 nfmsg->version = NFNETLINK_V0;
2938 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2939 goto nla_put_failure;
2940 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2941 goto nla_put_failure;
2943 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2945 goto nla_put_failure;
2947 err = nf_tables_fill_setelem(skb, set, elem);
2949 goto nla_put_failure;
2951 nla_nest_end(skb, nest);
2953 return nlmsg_end(skb, nlh);
2956 nlmsg_trim(skb, nlh);
2960 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
2961 const struct nft_set *set,
2962 const struct nft_set_elem *elem,
2963 int event, u16 flags)
2965 struct net *net = ctx->net;
2966 u32 portid = ctx->portid;
2967 struct sk_buff *skb;
2970 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
2974 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2978 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
2985 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
2989 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
2993 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
2995 struct nft_set *set)
2997 struct nft_trans *trans;
2999 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3003 nft_trans_elem_set(trans) = set;
3007 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3008 const struct nlattr *attr)
3010 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3011 struct nft_data_desc d1, d2;
3012 struct nft_set_elem elem;
3013 struct nft_set_binding *binding;
3014 enum nft_registers dreg;
3015 struct nft_trans *trans;
3018 if (set->size && set->nelems == set->size)
3021 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3022 nft_set_elem_policy);
3026 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3030 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3031 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3032 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
3036 if (set->flags & NFT_SET_MAP) {
3037 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3038 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
3040 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3041 elem.flags & NFT_SET_ELEM_INTERVAL_END)
3044 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3048 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3052 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3056 if (set->ops->get(set, &elem) == 0)
3059 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3060 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
3065 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3068 dreg = nft_type_to_reg(set->dtype);
3069 list_for_each_entry(binding, &set->bindings, list) {
3070 struct nft_ctx bind_ctx = {
3072 .table = ctx->table,
3073 .chain = (struct nft_chain *)binding->chain,
3076 err = nft_validate_data_load(&bind_ctx, dreg,
3077 &elem.data, d2.type);
3083 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3087 err = set->ops->insert(set, &elem);
3091 nft_trans_elem(trans) = elem;
3092 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3098 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3099 nft_data_uninit(&elem.data, d2.type);
3101 nft_data_uninit(&elem.key, d1.type);
3106 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3107 const struct nlmsghdr *nlh,
3108 const struct nlattr * const nla[])
3110 struct net *net = sock_net(skb->sk);
3111 const struct nlattr *attr;
3112 struct nft_set *set;
3116 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3120 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3122 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3123 set = nf_tables_set_lookup_byid(net,
3124 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3127 return PTR_ERR(set);
3130 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3133 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3134 err = nft_add_set_elem(&ctx, set, attr);
3143 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3144 const struct nlattr *attr)
3146 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3147 struct nft_data_desc desc;
3148 struct nft_set_elem elem;
3149 struct nft_trans *trans;
3152 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3153 nft_set_elem_policy);
3158 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3161 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3166 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3169 err = set->ops->get(set, &elem);
3173 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3177 nft_trans_elem(trans) = elem;
3178 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3180 nft_data_uninit(&elem.key, NFT_DATA_VALUE);
3181 if (set->flags & NFT_SET_MAP)
3182 nft_data_uninit(&elem.data, set->dtype);
3185 nft_data_uninit(&elem.key, desc.type);
3190 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3191 const struct nlmsghdr *nlh,
3192 const struct nlattr * const nla[])
3194 const struct nlattr *attr;
3195 struct nft_set *set;
3199 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3203 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3205 return PTR_ERR(set);
3206 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3209 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3210 err = nft_del_setelem(&ctx, set, attr);
3219 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3220 [NFT_MSG_NEWTABLE] = {
3221 .call_batch = nf_tables_newtable,
3222 .attr_count = NFTA_TABLE_MAX,
3223 .policy = nft_table_policy,
3225 [NFT_MSG_GETTABLE] = {
3226 .call = nf_tables_gettable,
3227 .attr_count = NFTA_TABLE_MAX,
3228 .policy = nft_table_policy,
3230 [NFT_MSG_DELTABLE] = {
3231 .call_batch = nf_tables_deltable,
3232 .attr_count = NFTA_TABLE_MAX,
3233 .policy = nft_table_policy,
3235 [NFT_MSG_NEWCHAIN] = {
3236 .call_batch = nf_tables_newchain,
3237 .attr_count = NFTA_CHAIN_MAX,
3238 .policy = nft_chain_policy,
3240 [NFT_MSG_GETCHAIN] = {
3241 .call = nf_tables_getchain,
3242 .attr_count = NFTA_CHAIN_MAX,
3243 .policy = nft_chain_policy,
3245 [NFT_MSG_DELCHAIN] = {
3246 .call_batch = nf_tables_delchain,
3247 .attr_count = NFTA_CHAIN_MAX,
3248 .policy = nft_chain_policy,
3250 [NFT_MSG_NEWRULE] = {
3251 .call_batch = nf_tables_newrule,
3252 .attr_count = NFTA_RULE_MAX,
3253 .policy = nft_rule_policy,
3255 [NFT_MSG_GETRULE] = {
3256 .call = nf_tables_getrule,
3257 .attr_count = NFTA_RULE_MAX,
3258 .policy = nft_rule_policy,
3260 [NFT_MSG_DELRULE] = {
3261 .call_batch = nf_tables_delrule,
3262 .attr_count = NFTA_RULE_MAX,
3263 .policy = nft_rule_policy,
3265 [NFT_MSG_NEWSET] = {
3266 .call_batch = nf_tables_newset,
3267 .attr_count = NFTA_SET_MAX,
3268 .policy = nft_set_policy,
3270 [NFT_MSG_GETSET] = {
3271 .call = nf_tables_getset,
3272 .attr_count = NFTA_SET_MAX,
3273 .policy = nft_set_policy,
3275 [NFT_MSG_DELSET] = {
3276 .call_batch = nf_tables_delset,
3277 .attr_count = NFTA_SET_MAX,
3278 .policy = nft_set_policy,
3280 [NFT_MSG_NEWSETELEM] = {
3281 .call_batch = nf_tables_newsetelem,
3282 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3283 .policy = nft_set_elem_list_policy,
3285 [NFT_MSG_GETSETELEM] = {
3286 .call = nf_tables_getsetelem,
3287 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3288 .policy = nft_set_elem_list_policy,
3290 [NFT_MSG_DELSETELEM] = {
3291 .call_batch = nf_tables_delsetelem,
3292 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3293 .policy = nft_set_elem_list_policy,
3297 static void nft_chain_commit_update(struct nft_trans *trans)
3299 struct nft_base_chain *basechain;
3301 if (nft_trans_chain_name(trans)[0])
3302 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3304 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3307 basechain = nft_base_chain(trans->ctx.chain);
3308 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3310 switch (nft_trans_chain_policy(trans)) {
3313 basechain->policy = nft_trans_chain_policy(trans);
3318 /* Schedule objects for release via rcu to make sure no packets are accesing
3321 static void nf_tables_commit_release_rcu(struct rcu_head *rt)
3323 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3325 switch (trans->msg_type) {
3326 case NFT_MSG_DELTABLE:
3327 nf_tables_table_destroy(&trans->ctx);
3329 case NFT_MSG_DELCHAIN:
3330 nf_tables_chain_destroy(trans->ctx.chain);
3332 case NFT_MSG_DELRULE:
3333 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3335 case NFT_MSG_DELSET:
3336 nft_set_destroy(nft_trans_set(trans));
3342 static int nf_tables_commit(struct sk_buff *skb)
3344 struct net *net = sock_net(skb->sk);
3345 struct nft_trans *trans, *next;
3346 struct nft_set *set;
3348 /* Bump generation counter, invalidate any dump in progress */
3351 /* A new generation has just started */
3352 net->nft.gencursor = gencursor_next(net);
3354 /* Make sure all packets have left the previous generation before
3355 * purging old rules.
3359 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3360 switch (trans->msg_type) {
3361 case NFT_MSG_NEWTABLE:
3362 if (nft_trans_table_update(trans)) {
3363 if (!nft_trans_table_enable(trans)) {
3364 nf_tables_table_disable(trans->ctx.afi,
3366 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3369 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3371 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3372 nft_trans_destroy(trans);
3374 case NFT_MSG_DELTABLE:
3375 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3377 case NFT_MSG_NEWCHAIN:
3378 if (nft_trans_chain_update(trans))
3379 nft_chain_commit_update(trans);
3381 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3383 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3384 nft_trans_destroy(trans);
3386 case NFT_MSG_DELCHAIN:
3387 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3388 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) &&
3389 trans->ctx.chain->flags & NFT_BASE_CHAIN) {
3390 nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops,
3391 trans->ctx.afi->nops);
3394 case NFT_MSG_NEWRULE:
3395 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3396 nf_tables_rule_notify(&trans->ctx,
3397 nft_trans_rule(trans),
3399 nft_trans_destroy(trans);
3401 case NFT_MSG_DELRULE:
3402 list_del_rcu(&nft_trans_rule(trans)->list);
3403 nf_tables_rule_notify(&trans->ctx,
3404 nft_trans_rule(trans),
3407 case NFT_MSG_NEWSET:
3408 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3409 /* This avoids hitting -EBUSY when deleting the table
3410 * from the transaction.
3412 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3413 !list_empty(&nft_trans_set(trans)->bindings))
3414 trans->ctx.table->use--;
3416 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3417 NFT_MSG_NEWSET, GFP_KERNEL);
3418 nft_trans_destroy(trans);
3420 case NFT_MSG_DELSET:
3421 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3422 NFT_MSG_DELSET, GFP_KERNEL);
3424 case NFT_MSG_NEWSETELEM:
3425 nf_tables_setelem_notify(&trans->ctx,
3426 nft_trans_elem_set(trans),
3427 &nft_trans_elem(trans),
3428 NFT_MSG_NEWSETELEM, 0);
3429 nft_trans_destroy(trans);
3431 case NFT_MSG_DELSETELEM:
3432 nf_tables_setelem_notify(&trans->ctx,
3433 nft_trans_elem_set(trans),
3434 &nft_trans_elem(trans),
3435 NFT_MSG_DELSETELEM, 0);
3436 set = nft_trans_elem_set(trans);
3437 set->ops->get(set, &nft_trans_elem(trans));
3438 set->ops->remove(set, &nft_trans_elem(trans));
3439 nft_trans_destroy(trans);
3444 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3445 list_del(&trans->list);
3446 trans->ctx.nla = NULL;
3447 call_rcu(&trans->rcu_head, nf_tables_commit_release_rcu);
3453 /* Schedule objects for release via rcu to make sure no packets are accesing
3456 static void nf_tables_abort_release_rcu(struct rcu_head *rt)
3458 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3460 switch (trans->msg_type) {
3461 case NFT_MSG_NEWTABLE:
3462 nf_tables_table_destroy(&trans->ctx);
3464 case NFT_MSG_NEWCHAIN:
3465 nf_tables_chain_destroy(trans->ctx.chain);
3467 case NFT_MSG_NEWRULE:
3468 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3470 case NFT_MSG_NEWSET:
3471 nft_set_destroy(nft_trans_set(trans));
3477 static int nf_tables_abort(struct sk_buff *skb)
3479 struct net *net = sock_net(skb->sk);
3480 struct nft_trans *trans, *next;
3481 struct nft_set *set;
3483 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3484 switch (trans->msg_type) {
3485 case NFT_MSG_NEWTABLE:
3486 if (nft_trans_table_update(trans)) {
3487 if (nft_trans_table_enable(trans)) {
3488 nf_tables_table_disable(trans->ctx.afi,
3490 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3492 nft_trans_destroy(trans);
3494 list_del(&trans->ctx.table->list);
3497 case NFT_MSG_DELTABLE:
3498 list_add_tail(&trans->ctx.table->list,
3499 &trans->ctx.afi->tables);
3500 nft_trans_destroy(trans);
3502 case NFT_MSG_NEWCHAIN:
3503 if (nft_trans_chain_update(trans)) {
3504 if (nft_trans_chain_stats(trans))
3505 free_percpu(nft_trans_chain_stats(trans));
3507 nft_trans_destroy(trans);
3509 trans->ctx.table->use--;
3510 list_del(&trans->ctx.chain->list);
3511 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) &&
3512 trans->ctx.chain->flags & NFT_BASE_CHAIN) {
3513 nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops,
3514 trans->ctx.afi->nops);
3518 case NFT_MSG_DELCHAIN:
3519 trans->ctx.table->use++;
3520 list_add_tail(&trans->ctx.chain->list,
3521 &trans->ctx.table->chains);
3522 nft_trans_destroy(trans);
3524 case NFT_MSG_NEWRULE:
3525 trans->ctx.chain->use--;
3526 list_del_rcu(&nft_trans_rule(trans)->list);
3528 case NFT_MSG_DELRULE:
3529 trans->ctx.chain->use++;
3530 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3531 nft_trans_destroy(trans);
3533 case NFT_MSG_NEWSET:
3534 trans->ctx.table->use--;
3535 list_del(&nft_trans_set(trans)->list);
3537 case NFT_MSG_DELSET:
3538 trans->ctx.table->use++;
3539 list_add_tail(&nft_trans_set(trans)->list,
3540 &trans->ctx.table->sets);
3541 nft_trans_destroy(trans);
3543 case NFT_MSG_NEWSETELEM:
3544 nft_trans_elem_set(trans)->nelems--;
3545 set = nft_trans_elem_set(trans);
3546 set->ops->get(set, &nft_trans_elem(trans));
3547 set->ops->remove(set, &nft_trans_elem(trans));
3548 nft_trans_destroy(trans);
3550 case NFT_MSG_DELSETELEM:
3551 nft_trans_elem_set(trans)->nelems++;
3552 nft_trans_destroy(trans);
3557 list_for_each_entry_safe_reverse(trans, next,
3558 &net->nft.commit_list, list) {
3559 list_del(&trans->list);
3560 trans->ctx.nla = NULL;
3561 call_rcu(&trans->rcu_head, nf_tables_abort_release_rcu);
3567 static const struct nfnetlink_subsystem nf_tables_subsys = {
3568 .name = "nf_tables",
3569 .subsys_id = NFNL_SUBSYS_NFTABLES,
3570 .cb_count = NFT_MSG_MAX,
3572 .commit = nf_tables_commit,
3573 .abort = nf_tables_abort,
3577 * Loop detection - walk through the ruleset beginning at the destination chain
3578 * of a new jump until either the source chain is reached (loop) or all
3579 * reachable chains have been traversed.
3581 * The loop check is performed whenever a new jump verdict is added to an
3582 * expression or verdict map or a verdict map is bound to a new chain.
3585 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3586 const struct nft_chain *chain);
3588 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3589 const struct nft_set *set,
3590 const struct nft_set_iter *iter,
3591 const struct nft_set_elem *elem)
3593 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3596 switch (elem->data.verdict) {
3599 return nf_tables_check_loops(ctx, elem->data.chain);
3605 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3606 const struct nft_chain *chain)
3608 const struct nft_rule *rule;
3609 const struct nft_expr *expr, *last;
3610 const struct nft_set *set;
3611 struct nft_set_binding *binding;
3612 struct nft_set_iter iter;
3614 if (ctx->chain == chain)
3617 list_for_each_entry(rule, &chain->rules, list) {
3618 nft_rule_for_each_expr(expr, last, rule) {
3619 const struct nft_data *data = NULL;
3622 if (!expr->ops->validate)
3625 err = expr->ops->validate(ctx, expr, &data);
3632 switch (data->verdict) {
3635 err = nf_tables_check_loops(ctx, data->chain);
3644 list_for_each_entry(set, &ctx->table->sets, list) {
3645 if (!(set->flags & NFT_SET_MAP) ||
3646 set->dtype != NFT_DATA_VERDICT)
3649 list_for_each_entry(binding, &set->bindings, list) {
3650 if (binding->chain != chain)
3656 iter.fn = nf_tables_loop_check_setelem;
3658 set->ops->walk(ctx, set, &iter);
3668 * nft_validate_input_register - validate an expressions' input register
3670 * @reg: the register number
3672 * Validate that the input register is one of the general purpose
3675 int nft_validate_input_register(enum nft_registers reg)
3677 if (reg <= NFT_REG_VERDICT)
3679 if (reg > NFT_REG_MAX)
3683 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3686 * nft_validate_output_register - validate an expressions' output register
3688 * @reg: the register number
3690 * Validate that the output register is one of the general purpose
3691 * registers or the verdict register.
3693 int nft_validate_output_register(enum nft_registers reg)
3695 if (reg < NFT_REG_VERDICT)
3697 if (reg > NFT_REG_MAX)
3701 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3704 * nft_validate_data_load - validate an expressions' data load
3706 * @ctx: context of the expression performing the load
3707 * @reg: the destination register number
3708 * @data: the data to load
3709 * @type: the data type
3711 * Validate that a data load uses the appropriate data type for
3712 * the destination register. A value of NULL for the data means
3713 * that its runtime gathered data, which is always of type
3716 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3717 const struct nft_data *data,
3718 enum nft_data_types type)
3723 case NFT_REG_VERDICT:
3724 if (data == NULL || type != NFT_DATA_VERDICT)
3727 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3728 err = nf_tables_check_loops(ctx, data->chain);
3732 if (ctx->chain->level + 1 > data->chain->level) {
3733 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3735 data->chain->level = ctx->chain->level + 1;
3741 if (data != NULL && type != NFT_DATA_VALUE)
3746 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3748 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3749 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3750 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3751 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3754 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3755 struct nft_data_desc *desc, const struct nlattr *nla)
3757 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3758 struct nft_chain *chain;
3761 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3765 if (!tb[NFTA_VERDICT_CODE])
3767 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3769 switch (data->verdict) {
3771 switch (data->verdict & NF_VERDICT_MASK) {
3783 desc->len = sizeof(data->verdict);
3787 if (!tb[NFTA_VERDICT_CHAIN])
3789 chain = nf_tables_chain_lookup(ctx->table,
3790 tb[NFTA_VERDICT_CHAIN]);
3792 return PTR_ERR(chain);
3793 if (chain->flags & NFT_BASE_CHAIN)
3797 data->chain = chain;
3798 desc->len = sizeof(data);
3802 desc->type = NFT_DATA_VERDICT;
3806 static void nft_verdict_uninit(const struct nft_data *data)
3808 switch (data->verdict) {
3816 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
3818 struct nlattr *nest;
3820 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
3822 goto nla_put_failure;
3824 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
3825 goto nla_put_failure;
3827 switch (data->verdict) {
3830 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
3831 goto nla_put_failure;
3833 nla_nest_end(skb, nest);
3840 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
3841 struct nft_data_desc *desc, const struct nlattr *nla)
3848 if (len > sizeof(data->data))
3851 nla_memcpy(data->data, nla, sizeof(data->data));
3852 desc->type = NFT_DATA_VALUE;
3857 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
3860 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
3863 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
3864 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
3865 .len = FIELD_SIZEOF(struct nft_data, data) },
3866 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
3870 * nft_data_init - parse nf_tables data netlink attributes
3872 * @ctx: context of the expression using the data
3873 * @data: destination struct nft_data
3874 * @desc: data description
3875 * @nla: netlink attribute containing data
3877 * Parse the netlink data attributes and initialize a struct nft_data.
3878 * The type and length of data are returned in the data description.
3880 * The caller can indicate that it only wants to accept data of type
3881 * NFT_DATA_VALUE by passing NULL for the ctx argument.
3883 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
3884 struct nft_data_desc *desc, const struct nlattr *nla)
3886 struct nlattr *tb[NFTA_DATA_MAX + 1];
3889 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
3893 if (tb[NFTA_DATA_VALUE])
3894 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
3895 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
3896 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
3899 EXPORT_SYMBOL_GPL(nft_data_init);
3902 * nft_data_uninit - release a nft_data item
3904 * @data: struct nft_data to release
3905 * @type: type of data
3907 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3908 * all others need to be released by calling this function.
3910 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
3913 case NFT_DATA_VALUE:
3915 case NFT_DATA_VERDICT:
3916 return nft_verdict_uninit(data);
3921 EXPORT_SYMBOL_GPL(nft_data_uninit);
3923 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
3924 enum nft_data_types type, unsigned int len)
3926 struct nlattr *nest;
3929 nest = nla_nest_start(skb, attr);
3934 case NFT_DATA_VALUE:
3935 err = nft_value_dump(skb, data, len);
3937 case NFT_DATA_VERDICT:
3938 err = nft_verdict_dump(skb, data);
3945 nla_nest_end(skb, nest);
3948 EXPORT_SYMBOL_GPL(nft_data_dump);
3950 static int nf_tables_init_net(struct net *net)
3952 INIT_LIST_HEAD(&net->nft.af_info);
3953 INIT_LIST_HEAD(&net->nft.commit_list);
3957 static struct pernet_operations nf_tables_net_ops = {
3958 .init = nf_tables_init_net,
3961 static int __init nf_tables_module_init(void)
3965 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
3972 err = nf_tables_core_module_init();
3976 err = nfnetlink_subsys_register(&nf_tables_subsys);
3980 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
3981 return register_pernet_subsys(&nf_tables_net_ops);
3983 nf_tables_core_module_exit();
3990 static void __exit nf_tables_module_exit(void)
3992 unregister_pernet_subsys(&nf_tables_net_ops);
3993 nfnetlink_subsys_unregister(&nf_tables_subsys);
3994 nf_tables_core_module_exit();
3998 module_init(nf_tables_module_init);
3999 module_exit(nf_tables_module_exit);
4001 MODULE_LICENSE("GPL");
4002 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4003 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);