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);
25 static LIST_HEAD(nf_tables_objects);
28 * nft_register_afinfo - register nf_tables address family info
30 * @afi: address family info to register
32 * Register the address family for use with nf_tables. Returns zero on
33 * success or a negative errno code otherwise.
35 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
37 INIT_LIST_HEAD(&afi->tables);
38 nfnl_lock(NFNL_SUBSYS_NFTABLES);
39 list_add_tail_rcu(&afi->list, &net->nft.af_info);
40 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
43 EXPORT_SYMBOL_GPL(nft_register_afinfo);
45 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
48 * nft_unregister_afinfo - unregister nf_tables address family info
50 * @afi: address family info to unregister
52 * Unregister the address family for use with nf_tables.
54 void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
56 nfnl_lock(NFNL_SUBSYS_NFTABLES);
57 __nft_release_afinfo(net, afi);
58 list_del_rcu(&afi->list);
59 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
61 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
63 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
65 struct nft_af_info *afi;
67 list_for_each_entry(afi, &net->nft.af_info, list) {
68 if (afi->family == family)
74 static struct nft_af_info *
75 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
77 struct nft_af_info *afi;
79 afi = nft_afinfo_lookup(net, family);
84 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
85 request_module("nft-afinfo-%u", family);
86 nfnl_lock(NFNL_SUBSYS_NFTABLES);
87 afi = nft_afinfo_lookup(net, family);
89 return ERR_PTR(-EAGAIN);
92 return ERR_PTR(-EAFNOSUPPORT);
95 static void nft_ctx_init(struct nft_ctx *ctx,
97 const struct sk_buff *skb,
98 const struct nlmsghdr *nlh,
99 struct nft_af_info *afi,
100 struct nft_table *table,
101 struct nft_chain *chain,
102 const struct nlattr * const *nla)
109 ctx->portid = NETLINK_CB(skb).portid;
110 ctx->report = nlmsg_report(nlh);
111 ctx->seq = nlh->nlmsg_seq;
114 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
115 int msg_type, u32 size, gfp_t gfp)
117 struct nft_trans *trans;
119 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
123 trans->msg_type = msg_type;
129 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
130 int msg_type, u32 size)
132 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
135 static void nft_trans_destroy(struct nft_trans *trans)
137 list_del(&trans->list);
141 static int nf_tables_register_hooks(struct net *net,
142 const struct nft_table *table,
143 struct nft_chain *chain,
144 unsigned int hook_nops)
146 if (table->flags & NFT_TABLE_F_DORMANT ||
147 !(chain->flags & NFT_BASE_CHAIN))
150 return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
154 static void nf_tables_unregister_hooks(struct net *net,
155 const struct nft_table *table,
156 struct nft_chain *chain,
157 unsigned int hook_nops)
159 if (table->flags & NFT_TABLE_F_DORMANT ||
160 !(chain->flags & NFT_BASE_CHAIN))
163 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
166 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
168 struct nft_trans *trans;
170 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
174 if (msg_type == NFT_MSG_NEWTABLE)
175 nft_activate_next(ctx->net, ctx->table);
177 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
181 static int nft_deltable(struct nft_ctx *ctx)
185 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
189 nft_deactivate_next(ctx->net, ctx->table);
193 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
195 struct nft_trans *trans;
197 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
201 if (msg_type == NFT_MSG_NEWCHAIN)
202 nft_activate_next(ctx->net, ctx->chain);
204 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
208 static int nft_delchain(struct nft_ctx *ctx)
212 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
217 nft_deactivate_next(ctx->net, ctx->chain);
223 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
225 /* You cannot delete the same rule twice */
226 if (nft_is_active_next(ctx->net, rule)) {
227 nft_deactivate_next(ctx->net, rule);
234 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
235 struct nft_rule *rule)
237 struct nft_trans *trans;
239 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
243 nft_trans_rule(trans) = rule;
244 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
249 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
251 struct nft_trans *trans;
254 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
258 err = nf_tables_delrule_deactivate(ctx, rule);
260 nft_trans_destroy(trans);
267 static int nft_delrule_by_chain(struct nft_ctx *ctx)
269 struct nft_rule *rule;
272 list_for_each_entry(rule, &ctx->chain->rules, list) {
273 err = nft_delrule(ctx, rule);
280 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
283 struct nft_trans *trans;
285 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
289 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
290 nft_trans_set_id(trans) =
291 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
292 nft_activate_next(ctx->net, set);
294 nft_trans_set(trans) = set;
295 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
300 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
304 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
308 nft_deactivate_next(ctx->net, set);
314 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
315 struct nft_object *obj)
317 struct nft_trans *trans;
319 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
323 if (msg_type == NFT_MSG_NEWOBJ)
324 nft_activate_next(ctx->net, obj);
326 nft_trans_obj(trans) = obj;
327 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
332 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
336 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
340 nft_deactivate_next(ctx->net, obj);
350 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
351 const struct nlattr *nla,
354 struct nft_table *table;
356 list_for_each_entry(table, &afi->tables, list) {
357 if (!nla_strcmp(nla, table->name) &&
358 nft_active_genmask(table, genmask))
364 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
365 const struct nlattr *nla,
368 struct nft_table *table;
371 return ERR_PTR(-EINVAL);
373 table = nft_table_lookup(afi, nla, genmask);
377 return ERR_PTR(-ENOENT);
380 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
382 return ++table->hgenerator;
385 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
387 static const struct nf_chain_type *
388 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
392 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
393 if (chain_type[family][i] != NULL &&
394 !nla_strcmp(nla, chain_type[family][i]->name))
395 return chain_type[family][i];
400 static const struct nf_chain_type *
401 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
402 const struct nlattr *nla,
405 const struct nf_chain_type *type;
407 type = __nf_tables_chain_type_lookup(afi->family, nla);
410 #ifdef CONFIG_MODULES
412 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
413 request_module("nft-chain-%u-%.*s", afi->family,
414 nla_len(nla), (const char *)nla_data(nla));
415 nfnl_lock(NFNL_SUBSYS_NFTABLES);
416 type = __nf_tables_chain_type_lookup(afi->family, nla);
418 return ERR_PTR(-EAGAIN);
421 return ERR_PTR(-ENOENT);
424 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
425 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
426 .len = NFT_TABLE_MAXNAMELEN - 1 },
427 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
430 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
431 u32 portid, u32 seq, int event, u32 flags,
432 int family, const struct nft_table *table)
434 struct nlmsghdr *nlh;
435 struct nfgenmsg *nfmsg;
437 event |= NFNL_SUBSYS_NFTABLES << 8;
438 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
440 goto nla_put_failure;
442 nfmsg = nlmsg_data(nlh);
443 nfmsg->nfgen_family = family;
444 nfmsg->version = NFNETLINK_V0;
445 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
447 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
448 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
449 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
450 goto nla_put_failure;
456 nlmsg_trim(skb, nlh);
460 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
466 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
470 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
474 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
475 event, 0, ctx->afi->family, ctx->table);
481 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
482 ctx->report, GFP_KERNEL);
485 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
491 static int nf_tables_dump_tables(struct sk_buff *skb,
492 struct netlink_callback *cb)
494 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
495 const struct nft_af_info *afi;
496 const struct nft_table *table;
497 unsigned int idx = 0, s_idx = cb->args[0];
498 struct net *net = sock_net(skb->sk);
499 int family = nfmsg->nfgen_family;
502 cb->seq = net->nft.base_seq;
504 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
505 if (family != NFPROTO_UNSPEC && family != afi->family)
508 list_for_each_entry_rcu(table, &afi->tables, list) {
512 memset(&cb->args[1], 0,
513 sizeof(cb->args) - sizeof(cb->args[0]));
514 if (!nft_is_active(net, table))
516 if (nf_tables_fill_table_info(skb, net,
517 NETLINK_CB(cb->skb).portid,
521 afi->family, table) < 0)
524 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
535 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
536 struct sk_buff *skb, const struct nlmsghdr *nlh,
537 const struct nlattr * const nla[])
539 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
540 u8 genmask = nft_genmask_cur(net);
541 const struct nft_af_info *afi;
542 const struct nft_table *table;
543 struct sk_buff *skb2;
544 int family = nfmsg->nfgen_family;
547 if (nlh->nlmsg_flags & NLM_F_DUMP) {
548 struct netlink_dump_control c = {
549 .dump = nf_tables_dump_tables,
551 return netlink_dump_start(nlsk, skb, nlh, &c);
554 afi = nf_tables_afinfo_lookup(net, family, false);
558 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
560 return PTR_ERR(table);
562 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
566 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
567 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
572 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
579 static void _nf_tables_table_disable(struct net *net,
580 const struct nft_af_info *afi,
581 struct nft_table *table,
584 struct nft_chain *chain;
587 list_for_each_entry(chain, &table->chains, list) {
588 if (!nft_is_active_next(net, chain))
590 if (!(chain->flags & NFT_BASE_CHAIN))
593 if (cnt && i++ == cnt)
596 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
601 static int nf_tables_table_enable(struct net *net,
602 const struct nft_af_info *afi,
603 struct nft_table *table)
605 struct nft_chain *chain;
608 list_for_each_entry(chain, &table->chains, list) {
609 if (!nft_is_active_next(net, chain))
611 if (!(chain->flags & NFT_BASE_CHAIN))
614 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
624 _nf_tables_table_disable(net, afi, table, i);
628 static void nf_tables_table_disable(struct net *net,
629 const struct nft_af_info *afi,
630 struct nft_table *table)
632 _nf_tables_table_disable(net, afi, table, 0);
635 static int nf_tables_updtable(struct nft_ctx *ctx)
637 struct nft_trans *trans;
641 if (!ctx->nla[NFTA_TABLE_FLAGS])
644 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
645 if (flags & ~NFT_TABLE_F_DORMANT)
648 if (flags == ctx->table->flags)
651 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
652 sizeof(struct nft_trans_table));
656 if ((flags & NFT_TABLE_F_DORMANT) &&
657 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
658 nft_trans_table_enable(trans) = false;
659 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
660 ctx->table->flags & NFT_TABLE_F_DORMANT) {
661 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
663 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
664 nft_trans_table_enable(trans) = true;
670 nft_trans_table_update(trans) = true;
671 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
674 nft_trans_destroy(trans);
678 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
679 struct sk_buff *skb, const struct nlmsghdr *nlh,
680 const struct nlattr * const nla[])
682 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
683 u8 genmask = nft_genmask_next(net);
684 const struct nlattr *name;
685 struct nft_af_info *afi;
686 struct nft_table *table;
687 int family = nfmsg->nfgen_family;
692 afi = nf_tables_afinfo_lookup(net, family, true);
696 name = nla[NFTA_TABLE_NAME];
697 table = nf_tables_table_lookup(afi, name, genmask);
699 if (PTR_ERR(table) != -ENOENT)
700 return PTR_ERR(table);
702 if (nlh->nlmsg_flags & NLM_F_EXCL)
704 if (nlh->nlmsg_flags & NLM_F_REPLACE)
707 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
708 return nf_tables_updtable(&ctx);
711 if (nla[NFTA_TABLE_FLAGS]) {
712 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
713 if (flags & ~NFT_TABLE_F_DORMANT)
718 if (!try_module_get(afi->owner))
722 table = kzalloc(sizeof(*table), GFP_KERNEL);
726 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
727 INIT_LIST_HEAD(&table->chains);
728 INIT_LIST_HEAD(&table->sets);
729 INIT_LIST_HEAD(&table->objects);
730 table->flags = flags;
732 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
733 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
737 list_add_tail_rcu(&table->list, &afi->tables);
742 module_put(afi->owner);
747 static int nft_flush_table(struct nft_ctx *ctx)
750 struct nft_chain *chain, *nc;
751 struct nft_object *obj, *ne;
752 struct nft_set *set, *ns;
754 list_for_each_entry(chain, &ctx->table->chains, list) {
755 if (!nft_is_active_next(ctx->net, chain))
760 err = nft_delrule_by_chain(ctx);
765 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
766 if (!nft_is_active_next(ctx->net, set))
769 if (set->flags & NFT_SET_ANONYMOUS &&
770 !list_empty(&set->bindings))
773 err = nft_delset(ctx, set);
778 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
779 err = nft_delobj(ctx, obj);
784 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
785 if (!nft_is_active_next(ctx->net, chain))
790 err = nft_delchain(ctx);
795 err = nft_deltable(ctx);
800 static int nft_flush(struct nft_ctx *ctx, int family)
802 struct nft_af_info *afi;
803 struct nft_table *table, *nt;
804 const struct nlattr * const *nla = ctx->nla;
807 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
808 if (family != AF_UNSPEC && afi->family != family)
812 list_for_each_entry_safe(table, nt, &afi->tables, list) {
813 if (!nft_is_active_next(ctx->net, table))
816 if (nla[NFTA_TABLE_NAME] &&
817 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
822 err = nft_flush_table(ctx);
831 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
832 struct sk_buff *skb, const struct nlmsghdr *nlh,
833 const struct nlattr * const nla[])
835 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
836 u8 genmask = nft_genmask_next(net);
837 struct nft_af_info *afi;
838 struct nft_table *table;
839 int family = nfmsg->nfgen_family;
842 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
843 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
844 return nft_flush(&ctx, family);
846 afi = nf_tables_afinfo_lookup(net, family, false);
850 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
852 return PTR_ERR(table);
857 return nft_flush_table(&ctx);
860 static void nf_tables_table_destroy(struct nft_ctx *ctx)
862 BUG_ON(ctx->table->use > 0);
865 module_put(ctx->afi->owner);
868 int nft_register_chain_type(const struct nf_chain_type *ctype)
872 nfnl_lock(NFNL_SUBSYS_NFTABLES);
873 if (chain_type[ctype->family][ctype->type] != NULL) {
877 chain_type[ctype->family][ctype->type] = ctype;
879 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
882 EXPORT_SYMBOL_GPL(nft_register_chain_type);
884 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
886 nfnl_lock(NFNL_SUBSYS_NFTABLES);
887 chain_type[ctype->family][ctype->type] = NULL;
888 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
890 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
896 static struct nft_chain *
897 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
900 struct nft_chain *chain;
902 list_for_each_entry(chain, &table->chains, list) {
903 if (chain->handle == handle &&
904 nft_active_genmask(chain, genmask))
908 return ERR_PTR(-ENOENT);
911 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
912 const struct nlattr *nla,
915 struct nft_chain *chain;
918 return ERR_PTR(-EINVAL);
920 list_for_each_entry(chain, &table->chains, list) {
921 if (!nla_strcmp(nla, chain->name) &&
922 nft_active_genmask(chain, genmask))
926 return ERR_PTR(-ENOENT);
929 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
930 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
931 .len = NFT_TABLE_MAXNAMELEN - 1 },
932 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
933 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
934 .len = NFT_CHAIN_MAXNAMELEN - 1 },
935 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
936 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
937 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
938 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
941 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
942 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
943 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
944 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
945 .len = IFNAMSIZ - 1 },
948 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
950 struct nft_stats *cpu_stats, total;
956 memset(&total, 0, sizeof(total));
957 for_each_possible_cpu(cpu) {
958 cpu_stats = per_cpu_ptr(stats, cpu);
960 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
961 pkts = cpu_stats->pkts;
962 bytes = cpu_stats->bytes;
963 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
965 total.bytes += bytes;
967 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
969 goto nla_put_failure;
971 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
973 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
975 goto nla_put_failure;
977 nla_nest_end(skb, nest);
984 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
985 u32 portid, u32 seq, int event, u32 flags,
986 int family, const struct nft_table *table,
987 const struct nft_chain *chain)
989 struct nlmsghdr *nlh;
990 struct nfgenmsg *nfmsg;
992 event |= NFNL_SUBSYS_NFTABLES << 8;
993 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
995 goto nla_put_failure;
997 nfmsg = nlmsg_data(nlh);
998 nfmsg->nfgen_family = family;
999 nfmsg->version = NFNETLINK_V0;
1000 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1002 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1003 goto nla_put_failure;
1004 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1006 goto nla_put_failure;
1007 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1008 goto nla_put_failure;
1010 if (chain->flags & NFT_BASE_CHAIN) {
1011 const struct nft_base_chain *basechain = nft_base_chain(chain);
1012 const struct nf_hook_ops *ops = &basechain->ops[0];
1013 struct nlattr *nest;
1015 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1017 goto nla_put_failure;
1018 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1019 goto nla_put_failure;
1020 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1021 goto nla_put_failure;
1022 if (basechain->dev_name[0] &&
1023 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1024 goto nla_put_failure;
1025 nla_nest_end(skb, nest);
1027 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1028 htonl(basechain->policy)))
1029 goto nla_put_failure;
1031 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1032 goto nla_put_failure;
1034 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1035 goto nla_put_failure;
1038 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1039 goto nla_put_failure;
1041 nlmsg_end(skb, nlh);
1045 nlmsg_trim(skb, nlh);
1049 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1051 struct sk_buff *skb;
1055 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1059 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1063 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1064 event, 0, ctx->afi->family, ctx->table,
1071 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1072 ctx->report, GFP_KERNEL);
1075 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1081 static int nf_tables_dump_chains(struct sk_buff *skb,
1082 struct netlink_callback *cb)
1084 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1085 const struct nft_af_info *afi;
1086 const struct nft_table *table;
1087 const struct nft_chain *chain;
1088 unsigned int idx = 0, s_idx = cb->args[0];
1089 struct net *net = sock_net(skb->sk);
1090 int family = nfmsg->nfgen_family;
1093 cb->seq = net->nft.base_seq;
1095 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1096 if (family != NFPROTO_UNSPEC && family != afi->family)
1099 list_for_each_entry_rcu(table, &afi->tables, list) {
1100 list_for_each_entry_rcu(chain, &table->chains, list) {
1104 memset(&cb->args[1], 0,
1105 sizeof(cb->args) - sizeof(cb->args[0]));
1106 if (!nft_is_active(net, chain))
1108 if (nf_tables_fill_chain_info(skb, net,
1109 NETLINK_CB(cb->skb).portid,
1113 afi->family, table, chain) < 0)
1116 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1128 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1129 struct sk_buff *skb, const struct nlmsghdr *nlh,
1130 const struct nlattr * const nla[])
1132 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1133 u8 genmask = nft_genmask_cur(net);
1134 const struct nft_af_info *afi;
1135 const struct nft_table *table;
1136 const struct nft_chain *chain;
1137 struct sk_buff *skb2;
1138 int family = nfmsg->nfgen_family;
1141 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1142 struct netlink_dump_control c = {
1143 .dump = nf_tables_dump_chains,
1145 return netlink_dump_start(nlsk, skb, nlh, &c);
1148 afi = nf_tables_afinfo_lookup(net, family, false);
1150 return PTR_ERR(afi);
1152 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1154 return PTR_ERR(table);
1156 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1158 return PTR_ERR(chain);
1160 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1164 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1165 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1166 family, table, chain);
1170 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1177 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1178 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1179 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1182 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1184 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1185 struct nft_stats __percpu *newstats;
1186 struct nft_stats *stats;
1189 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1191 return ERR_PTR(err);
1193 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1194 return ERR_PTR(-EINVAL);
1196 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1197 if (newstats == NULL)
1198 return ERR_PTR(-ENOMEM);
1200 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1201 * are not exposed to userspace.
1204 stats = this_cpu_ptr(newstats);
1205 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1206 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1212 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1213 struct nft_stats __percpu *newstats)
1215 if (newstats == NULL)
1219 struct nft_stats __percpu *oldstats =
1220 nft_dereference(chain->stats);
1222 rcu_assign_pointer(chain->stats, newstats);
1224 free_percpu(oldstats);
1226 rcu_assign_pointer(chain->stats, newstats);
1229 static void nf_tables_chain_destroy(struct nft_chain *chain)
1231 BUG_ON(chain->use > 0);
1233 if (chain->flags & NFT_BASE_CHAIN) {
1234 struct nft_base_chain *basechain = nft_base_chain(chain);
1236 module_put(basechain->type->owner);
1237 free_percpu(basechain->stats);
1238 if (basechain->ops[0].dev != NULL)
1239 dev_put(basechain->ops[0].dev);
1246 struct nft_chain_hook {
1249 const struct nf_chain_type *type;
1250 struct net_device *dev;
1253 static int nft_chain_parse_hook(struct net *net,
1254 const struct nlattr * const nla[],
1255 struct nft_af_info *afi,
1256 struct nft_chain_hook *hook, bool create)
1258 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1259 const struct nf_chain_type *type;
1260 struct net_device *dev;
1263 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1268 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1269 ha[NFTA_HOOK_PRIORITY] == NULL)
1272 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1273 if (hook->num >= afi->nhooks)
1276 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1278 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1279 if (nla[NFTA_CHAIN_TYPE]) {
1280 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1283 return PTR_ERR(type);
1285 if (!(type->hook_mask & (1 << hook->num)))
1287 if (!try_module_get(type->owner))
1293 if (afi->flags & NFT_AF_NEEDS_DEV) {
1294 char ifname[IFNAMSIZ];
1296 if (!ha[NFTA_HOOK_DEV]) {
1297 module_put(type->owner);
1301 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1302 dev = dev_get_by_name(net, ifname);
1304 module_put(type->owner);
1308 } else if (ha[NFTA_HOOK_DEV]) {
1309 module_put(type->owner);
1316 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1318 module_put(hook->type->owner);
1319 if (hook->dev != NULL)
1323 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1324 struct sk_buff *skb, const struct nlmsghdr *nlh,
1325 const struct nlattr * const nla[])
1327 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1328 const struct nlattr * uninitialized_var(name);
1329 struct nft_af_info *afi;
1330 struct nft_table *table;
1331 struct nft_chain *chain;
1332 struct nft_base_chain *basechain = NULL;
1333 u8 genmask = nft_genmask_next(net);
1334 int family = nfmsg->nfgen_family;
1335 u8 policy = NF_ACCEPT;
1338 struct nft_stats __percpu *stats;
1343 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1345 afi = nf_tables_afinfo_lookup(net, family, true);
1347 return PTR_ERR(afi);
1349 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1351 return PTR_ERR(table);
1354 name = nla[NFTA_CHAIN_NAME];
1356 if (nla[NFTA_CHAIN_HANDLE]) {
1357 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1358 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1360 return PTR_ERR(chain);
1362 chain = nf_tables_chain_lookup(table, name, genmask);
1363 if (IS_ERR(chain)) {
1364 if (PTR_ERR(chain) != -ENOENT)
1365 return PTR_ERR(chain);
1370 if (nla[NFTA_CHAIN_POLICY]) {
1371 if ((chain != NULL &&
1372 !(chain->flags & NFT_BASE_CHAIN)))
1375 if (chain == NULL &&
1376 nla[NFTA_CHAIN_HOOK] == NULL)
1379 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1389 if (chain != NULL) {
1390 struct nft_stats *stats = NULL;
1391 struct nft_trans *trans;
1393 if (nlh->nlmsg_flags & NLM_F_EXCL)
1395 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1398 if (nla[NFTA_CHAIN_HOOK]) {
1399 struct nft_base_chain *basechain;
1400 struct nft_chain_hook hook;
1401 struct nf_hook_ops *ops;
1403 if (!(chain->flags & NFT_BASE_CHAIN))
1406 err = nft_chain_parse_hook(net, nla, afi, &hook,
1411 basechain = nft_base_chain(chain);
1412 if (basechain->type != hook.type) {
1413 nft_chain_release_hook(&hook);
1417 for (i = 0; i < afi->nops; i++) {
1418 ops = &basechain->ops[i];
1419 if (ops->hooknum != hook.num ||
1420 ops->priority != hook.priority ||
1421 ops->dev != hook.dev) {
1422 nft_chain_release_hook(&hook);
1426 nft_chain_release_hook(&hook);
1429 if (nla[NFTA_CHAIN_HANDLE] && name) {
1430 struct nft_chain *chain2;
1432 chain2 = nf_tables_chain_lookup(table,
1433 nla[NFTA_CHAIN_NAME],
1436 return PTR_ERR(chain2);
1439 if (nla[NFTA_CHAIN_COUNTERS]) {
1440 if (!(chain->flags & NFT_BASE_CHAIN))
1443 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1445 return PTR_ERR(stats);
1448 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1449 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1450 sizeof(struct nft_trans_chain));
1451 if (trans == NULL) {
1456 nft_trans_chain_stats(trans) = stats;
1457 nft_trans_chain_update(trans) = true;
1459 if (nla[NFTA_CHAIN_POLICY])
1460 nft_trans_chain_policy(trans) = policy;
1462 nft_trans_chain_policy(trans) = -1;
1464 if (nla[NFTA_CHAIN_HANDLE] && name) {
1465 nla_strlcpy(nft_trans_chain_name(trans), name,
1466 NFT_CHAIN_MAXNAMELEN);
1468 list_add_tail(&trans->list, &net->nft.commit_list);
1472 if (table->use == UINT_MAX)
1475 if (nla[NFTA_CHAIN_HOOK]) {
1476 struct nft_chain_hook hook;
1477 struct nf_hook_ops *ops;
1480 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
1484 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1485 if (basechain == NULL) {
1486 nft_chain_release_hook(&hook);
1490 if (hook.dev != NULL)
1491 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1493 if (nla[NFTA_CHAIN_COUNTERS]) {
1494 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1495 if (IS_ERR(stats)) {
1496 nft_chain_release_hook(&hook);
1498 return PTR_ERR(stats);
1500 basechain->stats = stats;
1502 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1503 if (stats == NULL) {
1504 nft_chain_release_hook(&hook);
1508 rcu_assign_pointer(basechain->stats, stats);
1511 hookfn = hook.type->hooks[hook.num];
1512 basechain->type = hook.type;
1513 chain = &basechain->chain;
1515 for (i = 0; i < afi->nops; i++) {
1516 ops = &basechain->ops[i];
1518 ops->hooknum = hook.num;
1519 ops->priority = hook.priority;
1521 ops->hook = afi->hooks[ops->hooknum];
1522 ops->dev = hook.dev;
1525 if (afi->hook_ops_init)
1526 afi->hook_ops_init(ops, i);
1529 chain->flags |= NFT_BASE_CHAIN;
1530 basechain->policy = policy;
1532 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1537 INIT_LIST_HEAD(&chain->rules);
1538 chain->handle = nf_tables_alloc_handle(table);
1539 chain->table = table;
1540 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1542 err = nf_tables_register_hooks(net, table, chain, afi->nops);
1546 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1547 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1552 list_add_tail_rcu(&chain->list, &table->chains);
1555 nf_tables_unregister_hooks(net, table, chain, afi->nops);
1557 nf_tables_chain_destroy(chain);
1561 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1562 struct sk_buff *skb, const struct nlmsghdr *nlh,
1563 const struct nlattr * const nla[])
1565 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1566 u8 genmask = nft_genmask_next(net);
1567 struct nft_af_info *afi;
1568 struct nft_table *table;
1569 struct nft_chain *chain;
1570 int family = nfmsg->nfgen_family;
1573 afi = nf_tables_afinfo_lookup(net, family, false);
1575 return PTR_ERR(afi);
1577 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1579 return PTR_ERR(table);
1581 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1583 return PTR_ERR(chain);
1587 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1589 return nft_delchain(&ctx);
1597 * nft_register_expr - register nf_tables expr type
1600 * Registers the expr type for use with nf_tables. Returns zero on
1601 * success or a negative errno code otherwise.
1603 int nft_register_expr(struct nft_expr_type *type)
1605 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1606 if (type->family == NFPROTO_UNSPEC)
1607 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1609 list_add_rcu(&type->list, &nf_tables_expressions);
1610 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1613 EXPORT_SYMBOL_GPL(nft_register_expr);
1616 * nft_unregister_expr - unregister nf_tables expr type
1619 * Unregisters the expr typefor use with nf_tables.
1621 void nft_unregister_expr(struct nft_expr_type *type)
1623 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1624 list_del_rcu(&type->list);
1625 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1627 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1629 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1632 const struct nft_expr_type *type;
1634 list_for_each_entry(type, &nf_tables_expressions, list) {
1635 if (!nla_strcmp(nla, type->name) &&
1636 (!type->family || type->family == family))
1642 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1645 const struct nft_expr_type *type;
1648 return ERR_PTR(-EINVAL);
1650 type = __nft_expr_type_get(family, nla);
1651 if (type != NULL && try_module_get(type->owner))
1654 #ifdef CONFIG_MODULES
1656 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1657 request_module("nft-expr-%u-%.*s", family,
1658 nla_len(nla), (char *)nla_data(nla));
1659 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1660 if (__nft_expr_type_get(family, nla))
1661 return ERR_PTR(-EAGAIN);
1663 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1664 request_module("nft-expr-%.*s",
1665 nla_len(nla), (char *)nla_data(nla));
1666 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1667 if (__nft_expr_type_get(family, nla))
1668 return ERR_PTR(-EAGAIN);
1671 return ERR_PTR(-ENOENT);
1674 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1675 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1676 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1679 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1680 const struct nft_expr *expr)
1682 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1683 goto nla_put_failure;
1685 if (expr->ops->dump) {
1686 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1688 goto nla_put_failure;
1689 if (expr->ops->dump(skb, expr) < 0)
1690 goto nla_put_failure;
1691 nla_nest_end(skb, data);
1700 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1701 const struct nft_expr *expr)
1703 struct nlattr *nest;
1705 nest = nla_nest_start(skb, attr);
1707 goto nla_put_failure;
1708 if (nf_tables_fill_expr_info(skb, expr) < 0)
1709 goto nla_put_failure;
1710 nla_nest_end(skb, nest);
1717 struct nft_expr_info {
1718 const struct nft_expr_ops *ops;
1719 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1722 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1723 const struct nlattr *nla,
1724 struct nft_expr_info *info)
1726 const struct nft_expr_type *type;
1727 const struct nft_expr_ops *ops;
1728 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1731 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1735 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1737 return PTR_ERR(type);
1739 if (tb[NFTA_EXPR_DATA]) {
1740 err = nla_parse_nested(info->tb, type->maxattr,
1741 tb[NFTA_EXPR_DATA], type->policy);
1745 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1747 if (type->select_ops != NULL) {
1748 ops = type->select_ops(ctx,
1749 (const struct nlattr * const *)info->tb);
1761 module_put(type->owner);
1765 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1766 const struct nft_expr_info *info,
1767 struct nft_expr *expr)
1769 const struct nft_expr_ops *ops = info->ops;
1774 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1786 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1787 struct nft_expr *expr)
1789 if (expr->ops->destroy)
1790 expr->ops->destroy(ctx, expr);
1791 module_put(expr->ops->type->owner);
1794 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1795 const struct nlattr *nla)
1797 struct nft_expr_info info;
1798 struct nft_expr *expr;
1801 err = nf_tables_expr_parse(ctx, nla, &info);
1806 expr = kzalloc(info.ops->size, GFP_KERNEL);
1810 err = nf_tables_newexpr(ctx, &info, expr);
1818 module_put(info.ops->type->owner);
1820 return ERR_PTR(err);
1823 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1825 nf_tables_expr_destroy(ctx, expr);
1833 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1836 struct nft_rule *rule;
1838 // FIXME: this sucks
1839 list_for_each_entry(rule, &chain->rules, list) {
1840 if (handle == rule->handle)
1844 return ERR_PTR(-ENOENT);
1847 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1848 const struct nlattr *nla)
1851 return ERR_PTR(-EINVAL);
1853 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1856 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1857 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1858 .len = NFT_TABLE_MAXNAMELEN - 1 },
1859 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1860 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1861 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1862 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1863 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1864 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1865 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1866 .len = NFT_USERDATA_MAXLEN },
1869 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1870 u32 portid, u32 seq, int event,
1871 u32 flags, int family,
1872 const struct nft_table *table,
1873 const struct nft_chain *chain,
1874 const struct nft_rule *rule)
1876 struct nlmsghdr *nlh;
1877 struct nfgenmsg *nfmsg;
1878 const struct nft_expr *expr, *next;
1879 struct nlattr *list;
1880 const struct nft_rule *prule;
1881 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1883 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1886 goto nla_put_failure;
1888 nfmsg = nlmsg_data(nlh);
1889 nfmsg->nfgen_family = family;
1890 nfmsg->version = NFNETLINK_V0;
1891 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1893 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1894 goto nla_put_failure;
1895 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1896 goto nla_put_failure;
1897 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1899 goto nla_put_failure;
1901 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1902 prule = list_entry(rule->list.prev, struct nft_rule, list);
1903 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1904 cpu_to_be64(prule->handle),
1906 goto nla_put_failure;
1909 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1911 goto nla_put_failure;
1912 nft_rule_for_each_expr(expr, next, rule) {
1913 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
1914 goto nla_put_failure;
1916 nla_nest_end(skb, list);
1919 struct nft_userdata *udata = nft_userdata(rule);
1920 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1922 goto nla_put_failure;
1925 nlmsg_end(skb, nlh);
1929 nlmsg_trim(skb, nlh);
1933 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1934 const struct nft_rule *rule,
1937 struct sk_buff *skb;
1941 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1945 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1949 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1950 event, 0, ctx->afi->family, ctx->table,
1957 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1958 ctx->report, GFP_KERNEL);
1961 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1967 struct nft_rule_dump_ctx {
1968 char table[NFT_TABLE_MAXNAMELEN];
1969 char chain[NFT_CHAIN_MAXNAMELEN];
1972 static int nf_tables_dump_rules(struct sk_buff *skb,
1973 struct netlink_callback *cb)
1975 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1976 const struct nft_rule_dump_ctx *ctx = cb->data;
1977 const struct nft_af_info *afi;
1978 const struct nft_table *table;
1979 const struct nft_chain *chain;
1980 const struct nft_rule *rule;
1981 unsigned int idx = 0, s_idx = cb->args[0];
1982 struct net *net = sock_net(skb->sk);
1983 int family = nfmsg->nfgen_family;
1986 cb->seq = net->nft.base_seq;
1988 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1989 if (family != NFPROTO_UNSPEC && family != afi->family)
1992 list_for_each_entry_rcu(table, &afi->tables, list) {
1993 if (ctx && ctx->table[0] &&
1994 strcmp(ctx->table, table->name) != 0)
1997 list_for_each_entry_rcu(chain, &table->chains, list) {
1998 if (ctx && ctx->chain[0] &&
1999 strcmp(ctx->chain, chain->name) != 0)
2002 list_for_each_entry_rcu(rule, &chain->rules, list) {
2003 if (!nft_is_active(net, rule))
2008 memset(&cb->args[1], 0,
2009 sizeof(cb->args) - sizeof(cb->args[0]));
2010 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2013 NLM_F_MULTI | NLM_F_APPEND,
2014 afi->family, table, chain, rule) < 0)
2017 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2031 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2037 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2038 struct sk_buff *skb, const struct nlmsghdr *nlh,
2039 const struct nlattr * const nla[])
2041 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2042 u8 genmask = nft_genmask_cur(net);
2043 const struct nft_af_info *afi;
2044 const struct nft_table *table;
2045 const struct nft_chain *chain;
2046 const struct nft_rule *rule;
2047 struct sk_buff *skb2;
2048 int family = nfmsg->nfgen_family;
2051 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2052 struct netlink_dump_control c = {
2053 .dump = nf_tables_dump_rules,
2054 .done = nf_tables_dump_rules_done,
2057 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2058 struct nft_rule_dump_ctx *ctx;
2060 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2064 if (nla[NFTA_RULE_TABLE])
2065 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2066 sizeof(ctx->table));
2067 if (nla[NFTA_RULE_CHAIN])
2068 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2069 sizeof(ctx->chain));
2073 return netlink_dump_start(nlsk, skb, nlh, &c);
2076 afi = nf_tables_afinfo_lookup(net, family, false);
2078 return PTR_ERR(afi);
2080 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2082 return PTR_ERR(table);
2084 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2086 return PTR_ERR(chain);
2088 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2090 return PTR_ERR(rule);
2092 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2096 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2097 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2098 family, table, chain, rule);
2102 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2109 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2110 struct nft_rule *rule)
2112 struct nft_expr *expr;
2115 * Careful: some expressions might not be initialized in case this
2116 * is called on error from nf_tables_newrule().
2118 expr = nft_expr_first(rule);
2119 while (expr != nft_expr_last(rule) && expr->ops) {
2120 nf_tables_expr_destroy(ctx, expr);
2121 expr = nft_expr_next(expr);
2126 #define NFT_RULE_MAXEXPRS 128
2128 static struct nft_expr_info *info;
2130 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2131 struct sk_buff *skb, const struct nlmsghdr *nlh,
2132 const struct nlattr * const nla[])
2134 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2135 u8 genmask = nft_genmask_next(net);
2136 struct nft_af_info *afi;
2137 struct nft_table *table;
2138 struct nft_chain *chain;
2139 struct nft_rule *rule, *old_rule = NULL;
2140 struct nft_userdata *udata;
2141 struct nft_trans *trans = NULL;
2142 struct nft_expr *expr;
2145 unsigned int size, i, n, ulen = 0, usize = 0;
2148 u64 handle, pos_handle;
2150 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2152 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2154 return PTR_ERR(afi);
2156 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2158 return PTR_ERR(table);
2160 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2162 return PTR_ERR(chain);
2164 if (nla[NFTA_RULE_HANDLE]) {
2165 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2166 rule = __nf_tables_rule_lookup(chain, handle);
2168 return PTR_ERR(rule);
2170 if (nlh->nlmsg_flags & NLM_F_EXCL)
2172 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2177 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2179 handle = nf_tables_alloc_handle(table);
2181 if (chain->use == UINT_MAX)
2185 if (nla[NFTA_RULE_POSITION]) {
2186 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2189 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2190 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2191 if (IS_ERR(old_rule))
2192 return PTR_ERR(old_rule);
2195 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2199 if (nla[NFTA_RULE_EXPRESSIONS]) {
2200 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2202 if (nla_type(tmp) != NFTA_LIST_ELEM)
2204 if (n == NFT_RULE_MAXEXPRS)
2206 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2209 size += info[n].ops->size;
2213 /* Check for overflow of dlen field */
2215 if (size >= 1 << 12)
2218 if (nla[NFTA_RULE_USERDATA]) {
2219 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2221 usize = sizeof(struct nft_userdata) + ulen;
2225 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2229 nft_activate_next(net, rule);
2231 rule->handle = handle;
2233 rule->udata = ulen ? 1 : 0;
2236 udata = nft_userdata(rule);
2237 udata->len = ulen - 1;
2238 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2241 expr = nft_expr_first(rule);
2242 for (i = 0; i < n; i++) {
2243 err = nf_tables_newexpr(&ctx, &info[i], expr);
2247 expr = nft_expr_next(expr);
2250 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2251 if (nft_is_active_next(net, old_rule)) {
2252 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2254 if (trans == NULL) {
2258 nft_deactivate_next(net, old_rule);
2260 list_add_tail_rcu(&rule->list, &old_rule->list);
2265 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2267 list_add_rcu(&rule->list, &old_rule->list);
2269 list_add_tail_rcu(&rule->list, &chain->rules);
2272 list_add_tail_rcu(&rule->list, &old_rule->list);
2274 list_add_rcu(&rule->list, &chain->rules);
2277 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2285 list_del_rcu(&rule->list);
2287 nf_tables_rule_destroy(&ctx, rule);
2289 for (i = 0; i < n; i++) {
2290 if (info[i].ops != NULL)
2291 module_put(info[i].ops->type->owner);
2296 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2297 struct sk_buff *skb, const struct nlmsghdr *nlh,
2298 const struct nlattr * const nla[])
2300 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2301 u8 genmask = nft_genmask_next(net);
2302 struct nft_af_info *afi;
2303 struct nft_table *table;
2304 struct nft_chain *chain = NULL;
2305 struct nft_rule *rule;
2306 int family = nfmsg->nfgen_family, err = 0;
2309 afi = nf_tables_afinfo_lookup(net, family, false);
2311 return PTR_ERR(afi);
2313 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2315 return PTR_ERR(table);
2317 if (nla[NFTA_RULE_CHAIN]) {
2318 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2321 return PTR_ERR(chain);
2324 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2327 if (nla[NFTA_RULE_HANDLE]) {
2328 rule = nf_tables_rule_lookup(chain,
2329 nla[NFTA_RULE_HANDLE]);
2331 return PTR_ERR(rule);
2333 err = nft_delrule(&ctx, rule);
2335 err = nft_delrule_by_chain(&ctx);
2338 list_for_each_entry(chain, &table->chains, list) {
2339 if (!nft_is_active_next(net, chain))
2343 err = nft_delrule_by_chain(&ctx);
2356 static LIST_HEAD(nf_tables_set_ops);
2358 int nft_register_set(struct nft_set_ops *ops)
2360 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2361 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
2362 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2365 EXPORT_SYMBOL_GPL(nft_register_set);
2367 void nft_unregister_set(struct nft_set_ops *ops)
2369 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2370 list_del_rcu(&ops->list);
2371 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2373 EXPORT_SYMBOL_GPL(nft_unregister_set);
2376 * Select a set implementation based on the data characteristics and the
2377 * given policy. The total memory use might not be known if no size is
2378 * given, in that case the amount of memory per element is used.
2380 static const struct nft_set_ops *
2381 nft_select_set_ops(const struct nlattr * const nla[],
2382 const struct nft_set_desc *desc,
2383 enum nft_set_policies policy)
2385 const struct nft_set_ops *ops, *bops;
2386 struct nft_set_estimate est, best;
2389 #ifdef CONFIG_MODULES
2390 if (list_empty(&nf_tables_set_ops)) {
2391 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2392 request_module("nft-set");
2393 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2394 if (!list_empty(&nf_tables_set_ops))
2395 return ERR_PTR(-EAGAIN);
2399 if (nla[NFTA_SET_FLAGS] != NULL) {
2400 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2401 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
2408 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2409 if ((ops->features & features) != features)
2411 if (!ops->estimate(desc, features, &est))
2415 case NFT_SET_POL_PERFORMANCE:
2416 if (est.class < best.class)
2418 if (est.class == best.class && est.size < best.size)
2421 case NFT_SET_POL_MEMORY:
2422 if (est.size < best.size)
2424 if (est.size == best.size && est.class < best.class)
2431 if (!try_module_get(ops->owner))
2434 module_put(bops->owner);
2443 return ERR_PTR(-EOPNOTSUPP);
2446 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2447 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2448 .len = NFT_TABLE_MAXNAMELEN - 1 },
2449 [NFTA_SET_NAME] = { .type = NLA_STRING,
2450 .len = NFT_SET_MAXNAMELEN - 1 },
2451 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2452 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2453 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2454 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2455 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2456 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2457 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2458 [NFTA_SET_ID] = { .type = NLA_U32 },
2459 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2460 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2461 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2462 .len = NFT_USERDATA_MAXLEN },
2463 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2466 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2467 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2470 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2471 const struct sk_buff *skb,
2472 const struct nlmsghdr *nlh,
2473 const struct nlattr * const nla[],
2476 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2477 struct nft_af_info *afi = NULL;
2478 struct nft_table *table = NULL;
2480 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2481 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2483 return PTR_ERR(afi);
2486 if (nla[NFTA_SET_TABLE] != NULL) {
2488 return -EAFNOSUPPORT;
2490 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2493 return PTR_ERR(table);
2496 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2500 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2501 const struct nlattr *nla, u8 genmask)
2503 struct nft_set *set;
2506 return ERR_PTR(-EINVAL);
2508 list_for_each_entry(set, &table->sets, list) {
2509 if (!nla_strcmp(nla, set->name) &&
2510 nft_active_genmask(set, genmask))
2513 return ERR_PTR(-ENOENT);
2515 EXPORT_SYMBOL_GPL(nf_tables_set_lookup);
2517 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2518 const struct nlattr *nla,
2521 struct nft_trans *trans;
2522 u32 id = ntohl(nla_get_be32(nla));
2524 list_for_each_entry(trans, &net->nft.commit_list, list) {
2525 struct nft_set *set = nft_trans_set(trans);
2527 if (trans->msg_type == NFT_MSG_NEWSET &&
2528 id == nft_trans_set_id(trans) &&
2529 nft_active_genmask(set, genmask))
2532 return ERR_PTR(-ENOENT);
2534 EXPORT_SYMBOL_GPL(nf_tables_set_lookup_byid);
2536 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2539 const struct nft_set *i;
2541 unsigned long *inuse;
2542 unsigned int n = 0, min = 0;
2544 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
2546 if (p[1] != 'd' || strchr(p + 2, '%'))
2549 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2553 list_for_each_entry(i, &ctx->table->sets, list) {
2556 if (!nft_is_active_next(ctx->net, set))
2558 if (!sscanf(i->name, name, &tmp))
2560 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2563 set_bit(tmp - min, inuse);
2566 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2567 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2568 min += BITS_PER_BYTE * PAGE_SIZE;
2569 memset(inuse, 0, PAGE_SIZE);
2572 free_page((unsigned long)inuse);
2575 snprintf(set->name, sizeof(set->name), name, min + n);
2576 list_for_each_entry(i, &ctx->table->sets, list) {
2577 if (!nft_is_active_next(ctx->net, i))
2579 if (!strcmp(set->name, i->name))
2585 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2586 const struct nft_set *set, u16 event, u16 flags)
2588 struct nfgenmsg *nfmsg;
2589 struct nlmsghdr *nlh;
2590 struct nlattr *desc;
2591 u32 portid = ctx->portid;
2594 event |= NFNL_SUBSYS_NFTABLES << 8;
2595 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2598 goto nla_put_failure;
2600 nfmsg = nlmsg_data(nlh);
2601 nfmsg->nfgen_family = ctx->afi->family;
2602 nfmsg->version = NFNETLINK_V0;
2603 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2605 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2606 goto nla_put_failure;
2607 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2608 goto nla_put_failure;
2609 if (set->flags != 0)
2610 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2611 goto nla_put_failure;
2613 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2614 goto nla_put_failure;
2615 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2616 goto nla_put_failure;
2617 if (set->flags & NFT_SET_MAP) {
2618 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2619 goto nla_put_failure;
2620 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2621 goto nla_put_failure;
2623 if (set->flags & NFT_SET_OBJECT &&
2624 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2625 goto nla_put_failure;
2628 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2629 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2631 goto nla_put_failure;
2633 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2634 goto nla_put_failure;
2636 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2637 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2638 goto nla_put_failure;
2641 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2642 goto nla_put_failure;
2644 desc = nla_nest_start(skb, NFTA_SET_DESC);
2646 goto nla_put_failure;
2648 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2649 goto nla_put_failure;
2650 nla_nest_end(skb, desc);
2652 nlmsg_end(skb, nlh);
2656 nlmsg_trim(skb, nlh);
2660 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2661 const struct nft_set *set,
2662 int event, gfp_t gfp_flags)
2664 struct sk_buff *skb;
2665 u32 portid = ctx->portid;
2669 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2673 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2677 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2683 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2684 ctx->report, gfp_flags);
2687 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2691 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2693 const struct nft_set *set;
2694 unsigned int idx, s_idx = cb->args[0];
2695 struct nft_af_info *afi;
2696 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2697 struct net *net = sock_net(skb->sk);
2698 int cur_family = cb->args[3];
2699 struct nft_ctx *ctx = cb->data, ctx_set;
2705 cb->seq = net->nft.base_seq;
2707 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2708 if (ctx->afi && ctx->afi != afi)
2712 if (afi->family != cur_family)
2717 list_for_each_entry_rcu(table, &afi->tables, list) {
2718 if (ctx->table && ctx->table != table)
2722 if (cur_table != table)
2728 list_for_each_entry_rcu(set, &table->sets, list) {
2731 if (!nft_is_active(net, set))
2735 ctx_set.table = table;
2737 if (nf_tables_fill_set(skb, &ctx_set, set,
2741 cb->args[2] = (unsigned long) table;
2742 cb->args[3] = afi->family;
2745 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2759 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2765 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2766 struct sk_buff *skb, const struct nlmsghdr *nlh,
2767 const struct nlattr * const nla[])
2769 u8 genmask = nft_genmask_cur(net);
2770 const struct nft_set *set;
2772 struct sk_buff *skb2;
2773 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2776 /* Verify existence before starting dump */
2777 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2781 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2782 struct netlink_dump_control c = {
2783 .dump = nf_tables_dump_sets,
2784 .done = nf_tables_dump_sets_done,
2786 struct nft_ctx *ctx_dump;
2788 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2789 if (ctx_dump == NULL)
2795 return netlink_dump_start(nlsk, skb, nlh, &c);
2798 /* Only accept unspec with dump */
2799 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2800 return -EAFNOSUPPORT;
2801 if (!nla[NFTA_SET_TABLE])
2804 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
2806 return PTR_ERR(set);
2808 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2812 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2816 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2823 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2824 struct nft_set_desc *desc,
2825 const struct nlattr *nla)
2827 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2830 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2834 if (da[NFTA_SET_DESC_SIZE] != NULL)
2835 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2840 static int nf_tables_newset(struct net *net, struct sock *nlsk,
2841 struct sk_buff *skb, const struct nlmsghdr *nlh,
2842 const struct nlattr * const nla[])
2844 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2845 u8 genmask = nft_genmask_next(net);
2846 const struct nft_set_ops *ops;
2847 struct nft_af_info *afi;
2848 struct nft_table *table;
2849 struct nft_set *set;
2851 char name[NFT_SET_MAXNAMELEN];
2855 u32 ktype, dtype, flags, policy, gc_int, objtype;
2856 struct nft_set_desc desc;
2857 unsigned char *udata;
2861 if (nla[NFTA_SET_TABLE] == NULL ||
2862 nla[NFTA_SET_NAME] == NULL ||
2863 nla[NFTA_SET_KEY_LEN] == NULL ||
2864 nla[NFTA_SET_ID] == NULL)
2867 memset(&desc, 0, sizeof(desc));
2869 ktype = NFT_DATA_VALUE;
2870 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2871 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2872 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2876 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2877 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
2881 if (nla[NFTA_SET_FLAGS] != NULL) {
2882 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2883 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2884 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2885 NFT_SET_MAP | NFT_SET_EVAL |
2888 /* Only one of these operations is supported */
2889 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
2890 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
2895 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2896 if (!(flags & NFT_SET_MAP))
2899 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2900 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2901 dtype != NFT_DATA_VERDICT)
2904 if (dtype != NFT_DATA_VERDICT) {
2905 if (nla[NFTA_SET_DATA_LEN] == NULL)
2907 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2908 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
2911 desc.dlen = sizeof(struct nft_verdict);
2912 } else if (flags & NFT_SET_MAP)
2915 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
2916 if (!(flags & NFT_SET_OBJECT))
2919 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
2920 if (objtype == NFT_OBJECT_UNSPEC ||
2921 objtype > NFT_OBJECT_MAX)
2923 } else if (flags & NFT_SET_OBJECT)
2926 objtype = NFT_OBJECT_UNSPEC;
2929 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2930 if (!(flags & NFT_SET_TIMEOUT))
2932 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2933 nla[NFTA_SET_TIMEOUT])));
2936 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2937 if (!(flags & NFT_SET_TIMEOUT))
2939 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2942 policy = NFT_SET_POL_PERFORMANCE;
2943 if (nla[NFTA_SET_POLICY] != NULL)
2944 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2946 if (nla[NFTA_SET_DESC] != NULL) {
2947 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2952 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2954 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2956 return PTR_ERR(afi);
2958 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
2960 return PTR_ERR(table);
2962 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
2964 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
2966 if (PTR_ERR(set) != -ENOENT)
2967 return PTR_ERR(set);
2969 if (nlh->nlmsg_flags & NLM_F_EXCL)
2971 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2976 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2979 ops = nft_select_set_ops(nla, &desc, policy);
2981 return PTR_ERR(ops);
2984 if (nla[NFTA_SET_USERDATA])
2985 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2988 if (ops->privsize != NULL)
2989 size = ops->privsize(nla);
2992 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
2996 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2997 err = nf_tables_set_alloc_name(&ctx, set, name);
3003 udata = set->data + size;
3004 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3007 INIT_LIST_HEAD(&set->bindings);
3010 set->klen = desc.klen;
3012 set->objtype = objtype;
3013 set->dlen = desc.dlen;
3015 set->size = desc.size;
3016 set->policy = policy;
3019 set->timeout = timeout;
3020 set->gc_int = gc_int;
3022 err = ops->init(set, &desc, nla);
3026 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3030 list_add_tail_rcu(&set->list, &table->sets);
3039 module_put(ops->owner);
3043 static void nft_set_destroy(struct nft_set *set)
3045 set->ops->destroy(set);
3046 module_put(set->ops->owner);
3050 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3052 list_del_rcu(&set->list);
3053 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3054 nft_set_destroy(set);
3057 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3058 struct sk_buff *skb, const struct nlmsghdr *nlh,
3059 const struct nlattr * const nla[])
3061 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3062 u8 genmask = nft_genmask_next(net);
3063 struct nft_set *set;
3067 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3068 return -EAFNOSUPPORT;
3069 if (nla[NFTA_SET_TABLE] == NULL)
3072 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3076 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3078 return PTR_ERR(set);
3079 if (!list_empty(&set->bindings))
3082 return nft_delset(&ctx, set);
3085 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3086 struct nft_set *set,
3087 const struct nft_set_iter *iter,
3088 struct nft_set_elem *elem)
3090 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3091 enum nft_registers dreg;
3093 dreg = nft_type_to_reg(set->dtype);
3094 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3095 set->dtype == NFT_DATA_VERDICT ?
3096 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3100 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3101 struct nft_set_binding *binding)
3103 struct nft_set_binding *i;
3104 struct nft_set_iter iter;
3106 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3109 if (binding->flags & NFT_SET_MAP) {
3110 /* If the set is already bound to the same chain all
3111 * jumps are already validated for that chain.
3113 list_for_each_entry(i, &set->bindings, list) {
3114 if (i->flags & NFT_SET_MAP &&
3115 i->chain == binding->chain)
3119 iter.genmask = nft_genmask_next(ctx->net);
3123 iter.fn = nf_tables_bind_check_setelem;
3125 set->ops->walk(ctx, set, &iter);
3130 binding->chain = ctx->chain;
3131 list_add_tail_rcu(&binding->list, &set->bindings);
3134 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3136 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3137 struct nft_set_binding *binding)
3139 list_del_rcu(&binding->list);
3141 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
3142 nft_is_active(ctx->net, set))
3143 nf_tables_set_destroy(ctx, set);
3145 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3147 const struct nft_set_ext_type nft_set_ext_types[] = {
3148 [NFT_SET_EXT_KEY] = {
3149 .align = __alignof__(u32),
3151 [NFT_SET_EXT_DATA] = {
3152 .align = __alignof__(u32),
3154 [NFT_SET_EXT_EXPR] = {
3155 .align = __alignof__(struct nft_expr),
3157 [NFT_SET_EXT_OBJREF] = {
3158 .len = sizeof(struct nft_object *),
3159 .align = __alignof__(struct nft_object *),
3161 [NFT_SET_EXT_FLAGS] = {
3163 .align = __alignof__(u8),
3165 [NFT_SET_EXT_TIMEOUT] = {
3167 .align = __alignof__(u64),
3169 [NFT_SET_EXT_EXPIRATION] = {
3170 .len = sizeof(unsigned long),
3171 .align = __alignof__(unsigned long),
3173 [NFT_SET_EXT_USERDATA] = {
3174 .len = sizeof(struct nft_userdata),
3175 .align = __alignof__(struct nft_userdata),
3178 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3184 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3185 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3186 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3187 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3188 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3189 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3190 .len = NFT_USERDATA_MAXLEN },
3193 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3194 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3195 .len = NFT_TABLE_MAXNAMELEN - 1 },
3196 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3197 .len = NFT_SET_MAXNAMELEN - 1 },
3198 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3199 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3202 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3203 const struct sk_buff *skb,
3204 const struct nlmsghdr *nlh,
3205 const struct nlattr * const nla[],
3208 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3209 struct nft_af_info *afi;
3210 struct nft_table *table;
3212 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3214 return PTR_ERR(afi);
3216 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3219 return PTR_ERR(table);
3221 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3225 static int nf_tables_fill_setelem(struct sk_buff *skb,
3226 const struct nft_set *set,
3227 const struct nft_set_elem *elem)
3229 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3230 unsigned char *b = skb_tail_pointer(skb);
3231 struct nlattr *nest;
3233 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3235 goto nla_put_failure;
3237 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3238 NFT_DATA_VALUE, set->klen) < 0)
3239 goto nla_put_failure;
3241 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3242 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3243 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3245 goto nla_put_failure;
3247 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3248 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3249 goto nla_put_failure;
3251 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3252 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3253 (*nft_set_ext_obj(ext))->name) < 0)
3254 goto nla_put_failure;
3256 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3257 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3258 htonl(*nft_set_ext_flags(ext))))
3259 goto nla_put_failure;
3261 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3262 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3263 cpu_to_be64(jiffies_to_msecs(
3264 *nft_set_ext_timeout(ext))),
3266 goto nla_put_failure;
3268 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3269 unsigned long expires, now = jiffies;
3271 expires = *nft_set_ext_expiration(ext);
3272 if (time_before(now, expires))
3277 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3278 cpu_to_be64(jiffies_to_msecs(expires)),
3280 goto nla_put_failure;
3283 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3284 struct nft_userdata *udata;
3286 udata = nft_set_ext_userdata(ext);
3287 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3288 udata->len + 1, udata->data))
3289 goto nla_put_failure;
3292 nla_nest_end(skb, nest);
3300 struct nft_set_dump_args {
3301 const struct netlink_callback *cb;
3302 struct nft_set_iter iter;
3303 struct sk_buff *skb;
3306 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3307 struct nft_set *set,
3308 const struct nft_set_iter *iter,
3309 struct nft_set_elem *elem)
3311 struct nft_set_dump_args *args;
3313 args = container_of(iter, struct nft_set_dump_args, iter);
3314 return nf_tables_fill_setelem(args->skb, set, elem);
3317 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3319 struct net *net = sock_net(skb->sk);
3320 u8 genmask = nft_genmask_cur(net);
3321 struct nft_set *set;
3322 struct nft_set_dump_args args;
3324 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3325 struct nfgenmsg *nfmsg;
3326 struct nlmsghdr *nlh;
3327 struct nlattr *nest;
3331 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3332 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
3336 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
3337 (void *)nla, genmask);
3341 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3344 return PTR_ERR(set);
3346 event = NFT_MSG_NEWSETELEM;
3347 event |= NFNL_SUBSYS_NFTABLES << 8;
3348 portid = NETLINK_CB(cb->skb).portid;
3349 seq = cb->nlh->nlmsg_seq;
3351 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3354 goto nla_put_failure;
3356 nfmsg = nlmsg_data(nlh);
3357 nfmsg->nfgen_family = ctx.afi->family;
3358 nfmsg->version = NFNETLINK_V0;
3359 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
3361 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3362 goto nla_put_failure;
3363 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3364 goto nla_put_failure;
3366 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3368 goto nla_put_failure;
3372 args.iter.genmask = nft_genmask_cur(ctx.net);
3373 args.iter.skip = cb->args[0];
3374 args.iter.count = 0;
3376 args.iter.fn = nf_tables_dump_setelem;
3377 set->ops->walk(&ctx, set, &args.iter);
3379 nla_nest_end(skb, nest);
3380 nlmsg_end(skb, nlh);
3382 if (args.iter.err && args.iter.err != -EMSGSIZE)
3383 return args.iter.err;
3384 if (args.iter.count == cb->args[0])
3387 cb->args[0] = args.iter.count;
3394 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3395 struct sk_buff *skb, const struct nlmsghdr *nlh,
3396 const struct nlattr * const nla[])
3398 u8 genmask = nft_genmask_cur(net);
3399 const struct nft_set *set;
3403 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3407 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3410 return PTR_ERR(set);
3412 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3413 struct netlink_dump_control c = {
3414 .dump = nf_tables_dump_set,
3416 return netlink_dump_start(nlsk, skb, nlh, &c);
3421 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3422 const struct nft_ctx *ctx, u32 seq,
3423 u32 portid, int event, u16 flags,
3424 const struct nft_set *set,
3425 const struct nft_set_elem *elem)
3427 struct nfgenmsg *nfmsg;
3428 struct nlmsghdr *nlh;
3429 struct nlattr *nest;
3432 event |= NFNL_SUBSYS_NFTABLES << 8;
3433 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3436 goto nla_put_failure;
3438 nfmsg = nlmsg_data(nlh);
3439 nfmsg->nfgen_family = ctx->afi->family;
3440 nfmsg->version = NFNETLINK_V0;
3441 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3443 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3444 goto nla_put_failure;
3445 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3446 goto nla_put_failure;
3448 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3450 goto nla_put_failure;
3452 err = nf_tables_fill_setelem(skb, set, elem);
3454 goto nla_put_failure;
3456 nla_nest_end(skb, nest);
3458 nlmsg_end(skb, nlh);
3462 nlmsg_trim(skb, nlh);
3466 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3467 const struct nft_set *set,
3468 const struct nft_set_elem *elem,
3469 int event, u16 flags)
3471 struct net *net = ctx->net;
3472 u32 portid = ctx->portid;
3473 struct sk_buff *skb;
3476 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3480 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3484 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3491 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3495 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3499 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3501 struct nft_set *set)
3503 struct nft_trans *trans;
3505 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3509 nft_trans_elem_set(trans) = set;
3513 void *nft_set_elem_init(const struct nft_set *set,
3514 const struct nft_set_ext_tmpl *tmpl,
3515 const u32 *key, const u32 *data,
3516 u64 timeout, gfp_t gfp)
3518 struct nft_set_ext *ext;
3521 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3525 ext = nft_set_elem_ext(set, elem);
3526 nft_set_ext_init(ext, tmpl);
3528 memcpy(nft_set_ext_key(ext), key, set->klen);
3529 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3530 memcpy(nft_set_ext_data(ext), data, set->dlen);
3531 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3532 *nft_set_ext_expiration(ext) =
3534 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3535 *nft_set_ext_timeout(ext) = timeout;
3540 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3543 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3545 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3546 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3547 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3548 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3549 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3550 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3551 (*nft_set_ext_obj(ext))->use--;
3554 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3556 static int nft_setelem_parse_flags(const struct nft_set *set,
3557 const struct nlattr *attr, u32 *flags)
3562 *flags = ntohl(nla_get_be32(attr));
3563 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3565 if (!(set->flags & NFT_SET_INTERVAL) &&
3566 *flags & NFT_SET_ELEM_INTERVAL_END)
3572 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3573 const struct nlattr *attr, u32 nlmsg_flags)
3575 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3576 u8 genmask = nft_genmask_next(ctx->net);
3577 struct nft_data_desc d1, d2;
3578 struct nft_set_ext_tmpl tmpl;
3579 struct nft_set_ext *ext, *ext2;
3580 struct nft_set_elem elem;
3581 struct nft_set_binding *binding;
3582 struct nft_object *obj = NULL;
3583 struct nft_userdata *udata;
3584 struct nft_data data;
3585 enum nft_registers dreg;
3586 struct nft_trans *trans;
3592 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3593 nft_set_elem_policy);
3597 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3600 nft_set_ext_prepare(&tmpl);
3602 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3606 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3608 if (set->flags & NFT_SET_MAP) {
3609 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3610 !(flags & NFT_SET_ELEM_INTERVAL_END))
3612 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3613 flags & NFT_SET_ELEM_INTERVAL_END)
3616 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3621 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3622 if (!(set->flags & NFT_SET_TIMEOUT))
3624 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3625 nla[NFTA_SET_ELEM_TIMEOUT])));
3626 } else if (set->flags & NFT_SET_TIMEOUT) {
3627 timeout = set->timeout;
3630 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3631 nla[NFTA_SET_ELEM_KEY]);
3635 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3638 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3640 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3641 if (timeout != set->timeout)
3642 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3645 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3646 if (!(set->flags & NFT_SET_OBJECT)) {
3650 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3651 set->objtype, genmask);
3656 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3659 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3660 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3661 nla[NFTA_SET_ELEM_DATA]);
3666 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3669 dreg = nft_type_to_reg(set->dtype);
3670 list_for_each_entry(binding, &set->bindings, list) {
3671 struct nft_ctx bind_ctx = {
3674 .table = ctx->table,
3675 .chain = (struct nft_chain *)binding->chain,
3678 if (!(binding->flags & NFT_SET_MAP))
3681 err = nft_validate_register_store(&bind_ctx, dreg,
3688 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
3691 /* The full maximum length of userdata can exceed the maximum
3692 * offset value (U8_MAX) for following extensions, therefor it
3693 * must be the last extension added.
3696 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3697 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3699 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3704 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
3705 timeout, GFP_KERNEL);
3706 if (elem.priv == NULL)
3709 ext = nft_set_elem_ext(set, elem.priv);
3711 *nft_set_ext_flags(ext) = flags;
3713 udata = nft_set_ext_userdata(ext);
3714 udata->len = ulen - 1;
3715 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3718 *nft_set_ext_obj(ext) = obj;
3722 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3726 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
3727 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3729 if (err == -EEXIST) {
3730 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3731 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3732 memcmp(nft_set_ext_data(ext),
3733 nft_set_ext_data(ext2), set->dlen) != 0) ||
3734 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3735 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3736 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
3738 else if (!(nlmsg_flags & NLM_F_EXCL))
3745 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3750 nft_trans_elem(trans) = elem;
3751 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3755 set->ops->remove(set, &elem);
3761 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3762 nft_data_uninit(&data, d2.type);
3764 nft_data_uninit(&elem.key.val, d1.type);
3769 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3770 struct sk_buff *skb, const struct nlmsghdr *nlh,
3771 const struct nlattr * const nla[])
3773 u8 genmask = nft_genmask_next(net);
3774 const struct nlattr *attr;
3775 struct nft_set *set;
3779 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3782 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3786 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3789 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3790 set = nf_tables_set_lookup_byid(net,
3791 nla[NFTA_SET_ELEM_LIST_SET_ID],
3795 return PTR_ERR(set);
3798 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3801 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3802 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
3809 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3810 const struct nlattr *attr)
3812 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3813 struct nft_set_ext_tmpl tmpl;
3814 struct nft_data_desc desc;
3815 struct nft_set_elem elem;
3816 struct nft_set_ext *ext;
3817 struct nft_trans *trans;
3822 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3823 nft_set_elem_policy);
3828 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3831 nft_set_ext_prepare(&tmpl);
3833 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3837 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3839 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3840 nla[NFTA_SET_ELEM_KEY]);
3845 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3848 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3851 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3853 if (elem.priv == NULL)
3856 ext = nft_set_elem_ext(set, elem.priv);
3858 *nft_set_ext_flags(ext) = flags;
3860 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3861 if (trans == NULL) {
3866 priv = set->ops->deactivate(ctx->net, set, &elem);
3874 nft_trans_elem(trans) = elem;
3875 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3883 nft_data_uninit(&elem.key.val, desc.type);
3888 static int nft_flush_set(const struct nft_ctx *ctx,
3889 struct nft_set *set,
3890 const struct nft_set_iter *iter,
3891 struct nft_set_elem *elem)
3893 struct nft_trans *trans;
3896 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
3897 sizeof(struct nft_trans_elem), GFP_ATOMIC);
3901 if (!set->ops->deactivate_one(ctx->net, set, elem->priv)) {
3907 nft_trans_elem_set(trans) = set;
3908 nft_trans_elem(trans) = *elem;
3909 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3917 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3918 struct sk_buff *skb, const struct nlmsghdr *nlh,
3919 const struct nlattr * const nla[])
3921 u8 genmask = nft_genmask_next(net);
3922 const struct nlattr *attr;
3923 struct nft_set *set;
3927 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3931 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3934 return PTR_ERR(set);
3935 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3938 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
3939 struct nft_set_dump_args args = {
3942 .fn = nft_flush_set,
3945 set->ops->walk(&ctx, set, &args.iter);
3947 return args.iter.err;
3950 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3951 err = nft_del_setelem(&ctx, set, attr);
3960 void nft_set_gc_batch_release(struct rcu_head *rcu)
3962 struct nft_set_gc_batch *gcb;
3965 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3966 for (i = 0; i < gcb->head.cnt; i++)
3967 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
3970 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3972 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3975 struct nft_set_gc_batch *gcb;
3977 gcb = kzalloc(sizeof(*gcb), gfp);
3980 gcb->head.set = set;
3983 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3990 * nft_register_obj- register nf_tables stateful object type
3993 * Registers the object type for use with nf_tables. Returns zero on
3994 * success or a negative errno code otherwise.
3996 int nft_register_obj(struct nft_object_type *obj_type)
3998 if (obj_type->type == NFT_OBJECT_UNSPEC)
4001 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4002 list_add_rcu(&obj_type->list, &nf_tables_objects);
4003 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4006 EXPORT_SYMBOL_GPL(nft_register_obj);
4009 * nft_unregister_obj - unregister nf_tables object type
4012 * Unregisters the object type for use with nf_tables.
4014 void nft_unregister_obj(struct nft_object_type *obj_type)
4016 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4017 list_del_rcu(&obj_type->list);
4018 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4020 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4022 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4023 const struct nlattr *nla,
4024 u32 objtype, u8 genmask)
4026 struct nft_object *obj;
4028 list_for_each_entry(obj, &table->objects, list) {
4029 if (!nla_strcmp(nla, obj->name) &&
4030 objtype == obj->type->type &&
4031 nft_active_genmask(obj, genmask))
4034 return ERR_PTR(-ENOENT);
4036 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4038 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4039 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4040 .len = NFT_TABLE_MAXNAMELEN - 1 },
4041 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4042 .len = NFT_OBJ_MAXNAMELEN - 1 },
4043 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4044 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4047 static struct nft_object *nft_obj_init(const struct nft_object_type *type,
4048 const struct nlattr *attr)
4050 struct nlattr *tb[type->maxattr + 1];
4051 struct nft_object *obj;
4055 err = nla_parse_nested(tb, type->maxattr, attr, type->policy);
4059 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4063 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4067 err = type->init((const struct nlattr * const *)tb, obj);
4076 return ERR_PTR(err);
4079 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4080 struct nft_object *obj, bool reset)
4082 struct nlattr *nest;
4084 nest = nla_nest_start(skb, attr);
4086 goto nla_put_failure;
4087 if (obj->type->dump(skb, obj, reset) < 0)
4088 goto nla_put_failure;
4089 nla_nest_end(skb, nest);
4096 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4098 const struct nft_object_type *type;
4100 list_for_each_entry(type, &nf_tables_objects, list) {
4101 if (objtype == type->type)
4107 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4109 const struct nft_object_type *type;
4111 type = __nft_obj_type_get(objtype);
4112 if (type != NULL && try_module_get(type->owner))
4115 #ifdef CONFIG_MODULES
4117 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4118 request_module("nft-obj-%u", objtype);
4119 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4120 if (__nft_obj_type_get(objtype))
4121 return ERR_PTR(-EAGAIN);
4124 return ERR_PTR(-ENOENT);
4127 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4128 struct sk_buff *skb, const struct nlmsghdr *nlh,
4129 const struct nlattr * const nla[])
4131 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4132 const struct nft_object_type *type;
4133 u8 genmask = nft_genmask_next(net);
4134 int family = nfmsg->nfgen_family;
4135 struct nft_af_info *afi;
4136 struct nft_table *table;
4137 struct nft_object *obj;
4142 if (!nla[NFTA_OBJ_TYPE] ||
4143 !nla[NFTA_OBJ_NAME] ||
4144 !nla[NFTA_OBJ_DATA])
4147 afi = nf_tables_afinfo_lookup(net, family, true);
4149 return PTR_ERR(afi);
4151 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4153 return PTR_ERR(table);
4155 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4156 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4163 if (nlh->nlmsg_flags & NLM_F_EXCL)
4169 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4171 type = nft_obj_type_get(objtype);
4173 return PTR_ERR(type);
4175 obj = nft_obj_init(type, nla[NFTA_OBJ_DATA]);
4181 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4183 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4187 list_add_tail_rcu(&obj->list, &table->objects);
4191 if (obj->type->destroy)
4192 obj->type->destroy(obj);
4195 module_put(type->owner);
4199 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4200 u32 portid, u32 seq, int event, u32 flags,
4201 int family, const struct nft_table *table,
4202 struct nft_object *obj, bool reset)
4204 struct nfgenmsg *nfmsg;
4205 struct nlmsghdr *nlh;
4207 event |= NFNL_SUBSYS_NFTABLES << 8;
4208 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4210 goto nla_put_failure;
4212 nfmsg = nlmsg_data(nlh);
4213 nfmsg->nfgen_family = family;
4214 nfmsg->version = NFNETLINK_V0;
4215 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4217 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4218 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4219 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4220 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4221 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4222 goto nla_put_failure;
4224 nlmsg_end(skb, nlh);
4228 nlmsg_trim(skb, nlh);
4232 struct nft_obj_filter {
4233 char table[NFT_OBJ_MAXNAMELEN];
4237 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4239 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4240 const struct nft_af_info *afi;
4241 const struct nft_table *table;
4242 unsigned int idx = 0, s_idx = cb->args[0];
4243 struct nft_obj_filter *filter = cb->data;
4244 struct net *net = sock_net(skb->sk);
4245 int family = nfmsg->nfgen_family;
4246 struct nft_object *obj;
4249 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4253 cb->seq = net->nft.base_seq;
4255 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4256 if (family != NFPROTO_UNSPEC && family != afi->family)
4259 list_for_each_entry_rcu(table, &afi->tables, list) {
4260 list_for_each_entry_rcu(obj, &table->objects, list) {
4261 if (!nft_is_active(net, obj))
4266 memset(&cb->args[1], 0,
4267 sizeof(cb->args) - sizeof(cb->args[0]));
4268 if (filter && filter->table[0] &&
4269 strcmp(filter->table, table->name))
4272 filter->type != NFT_OBJECT_UNSPEC &&
4273 obj->type->type != filter->type)
4276 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4279 NLM_F_MULTI | NLM_F_APPEND,
4280 afi->family, table, obj, reset) < 0)
4283 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4296 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4303 static struct nft_obj_filter *
4304 nft_obj_filter_alloc(const struct nlattr * const nla[])
4306 struct nft_obj_filter *filter;
4308 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4310 return ERR_PTR(-ENOMEM);
4312 if (nla[NFTA_OBJ_TABLE])
4313 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4314 NFT_TABLE_MAXNAMELEN);
4315 if (nla[NFTA_OBJ_TYPE])
4316 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4321 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4322 struct sk_buff *skb, const struct nlmsghdr *nlh,
4323 const struct nlattr * const nla[])
4325 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4326 u8 genmask = nft_genmask_cur(net);
4327 int family = nfmsg->nfgen_family;
4328 const struct nft_af_info *afi;
4329 const struct nft_table *table;
4330 struct nft_object *obj;
4331 struct sk_buff *skb2;
4336 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4337 struct netlink_dump_control c = {
4338 .dump = nf_tables_dump_obj,
4339 .done = nf_tables_dump_obj_done,
4342 if (nla[NFTA_OBJ_TABLE] ||
4343 nla[NFTA_OBJ_TYPE]) {
4344 struct nft_obj_filter *filter;
4346 filter = nft_obj_filter_alloc(nla);
4352 return netlink_dump_start(nlsk, skb, nlh, &c);
4355 if (!nla[NFTA_OBJ_NAME] ||
4356 !nla[NFTA_OBJ_TYPE])
4359 afi = nf_tables_afinfo_lookup(net, family, false);
4361 return PTR_ERR(afi);
4363 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4365 return PTR_ERR(table);
4367 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4368 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4370 return PTR_ERR(obj);
4372 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4376 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4379 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4380 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4381 family, table, obj, reset);
4385 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4393 static void nft_obj_destroy(struct nft_object *obj)
4395 if (obj->type->destroy)
4396 obj->type->destroy(obj);
4398 module_put(obj->type->owner);
4402 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4403 struct sk_buff *skb, const struct nlmsghdr *nlh,
4404 const struct nlattr * const nla[])
4406 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4407 u8 genmask = nft_genmask_next(net);
4408 int family = nfmsg->nfgen_family;
4409 struct nft_af_info *afi;
4410 struct nft_table *table;
4411 struct nft_object *obj;
4415 if (!nla[NFTA_OBJ_TYPE] ||
4416 !nla[NFTA_OBJ_NAME])
4419 afi = nf_tables_afinfo_lookup(net, family, true);
4421 return PTR_ERR(afi);
4423 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4425 return PTR_ERR(table);
4427 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4428 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4430 return PTR_ERR(obj);
4434 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4436 return nft_delobj(&ctx, obj);
4439 int nft_obj_notify(struct net *net, struct nft_table *table,
4440 struct nft_object *obj, u32 portid, u32 seq, int event,
4441 int family, int report, gfp_t gfp)
4443 struct sk_buff *skb;
4447 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4451 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4455 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4462 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4465 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
4469 EXPORT_SYMBOL_GPL(nft_obj_notify);
4471 static int nf_tables_obj_notify(const struct nft_ctx *ctx,
4472 struct nft_object *obj, int event)
4474 return nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
4475 ctx->seq, event, ctx->afi->family, ctx->report,
4479 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4480 u32 portid, u32 seq)
4482 struct nlmsghdr *nlh;
4483 struct nfgenmsg *nfmsg;
4484 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
4486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4488 goto nla_put_failure;
4490 nfmsg = nlmsg_data(nlh);
4491 nfmsg->nfgen_family = AF_UNSPEC;
4492 nfmsg->version = NFNETLINK_V0;
4493 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4495 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4496 goto nla_put_failure;
4498 nlmsg_end(skb, nlh);
4502 nlmsg_trim(skb, nlh);
4506 static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
4508 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4509 struct sk_buff *skb2;
4512 if (nlmsg_report(nlh) &&
4513 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4517 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4521 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4528 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
4529 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
4532 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4538 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4539 struct sk_buff *skb, const struct nlmsghdr *nlh,
4540 const struct nlattr * const nla[])
4542 struct sk_buff *skb2;
4545 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4549 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4554 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4560 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4561 [NFT_MSG_NEWTABLE] = {
4562 .call_batch = nf_tables_newtable,
4563 .attr_count = NFTA_TABLE_MAX,
4564 .policy = nft_table_policy,
4566 [NFT_MSG_GETTABLE] = {
4567 .call = nf_tables_gettable,
4568 .attr_count = NFTA_TABLE_MAX,
4569 .policy = nft_table_policy,
4571 [NFT_MSG_DELTABLE] = {
4572 .call_batch = nf_tables_deltable,
4573 .attr_count = NFTA_TABLE_MAX,
4574 .policy = nft_table_policy,
4576 [NFT_MSG_NEWCHAIN] = {
4577 .call_batch = nf_tables_newchain,
4578 .attr_count = NFTA_CHAIN_MAX,
4579 .policy = nft_chain_policy,
4581 [NFT_MSG_GETCHAIN] = {
4582 .call = nf_tables_getchain,
4583 .attr_count = NFTA_CHAIN_MAX,
4584 .policy = nft_chain_policy,
4586 [NFT_MSG_DELCHAIN] = {
4587 .call_batch = nf_tables_delchain,
4588 .attr_count = NFTA_CHAIN_MAX,
4589 .policy = nft_chain_policy,
4591 [NFT_MSG_NEWRULE] = {
4592 .call_batch = nf_tables_newrule,
4593 .attr_count = NFTA_RULE_MAX,
4594 .policy = nft_rule_policy,
4596 [NFT_MSG_GETRULE] = {
4597 .call = nf_tables_getrule,
4598 .attr_count = NFTA_RULE_MAX,
4599 .policy = nft_rule_policy,
4601 [NFT_MSG_DELRULE] = {
4602 .call_batch = nf_tables_delrule,
4603 .attr_count = NFTA_RULE_MAX,
4604 .policy = nft_rule_policy,
4606 [NFT_MSG_NEWSET] = {
4607 .call_batch = nf_tables_newset,
4608 .attr_count = NFTA_SET_MAX,
4609 .policy = nft_set_policy,
4611 [NFT_MSG_GETSET] = {
4612 .call = nf_tables_getset,
4613 .attr_count = NFTA_SET_MAX,
4614 .policy = nft_set_policy,
4616 [NFT_MSG_DELSET] = {
4617 .call_batch = nf_tables_delset,
4618 .attr_count = NFTA_SET_MAX,
4619 .policy = nft_set_policy,
4621 [NFT_MSG_NEWSETELEM] = {
4622 .call_batch = nf_tables_newsetelem,
4623 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4624 .policy = nft_set_elem_list_policy,
4626 [NFT_MSG_GETSETELEM] = {
4627 .call = nf_tables_getsetelem,
4628 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4629 .policy = nft_set_elem_list_policy,
4631 [NFT_MSG_DELSETELEM] = {
4632 .call_batch = nf_tables_delsetelem,
4633 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4634 .policy = nft_set_elem_list_policy,
4636 [NFT_MSG_GETGEN] = {
4637 .call = nf_tables_getgen,
4639 [NFT_MSG_NEWOBJ] = {
4640 .call_batch = nf_tables_newobj,
4641 .attr_count = NFTA_OBJ_MAX,
4642 .policy = nft_obj_policy,
4644 [NFT_MSG_GETOBJ] = {
4645 .call = nf_tables_getobj,
4646 .attr_count = NFTA_OBJ_MAX,
4647 .policy = nft_obj_policy,
4649 [NFT_MSG_DELOBJ] = {
4650 .call_batch = nf_tables_delobj,
4651 .attr_count = NFTA_OBJ_MAX,
4652 .policy = nft_obj_policy,
4654 [NFT_MSG_GETOBJ_RESET] = {
4655 .call = nf_tables_getobj,
4656 .attr_count = NFTA_OBJ_MAX,
4657 .policy = nft_obj_policy,
4661 static void nft_chain_commit_update(struct nft_trans *trans)
4663 struct nft_base_chain *basechain;
4665 if (nft_trans_chain_name(trans)[0])
4666 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4668 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
4671 basechain = nft_base_chain(trans->ctx.chain);
4672 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4674 switch (nft_trans_chain_policy(trans)) {
4677 basechain->policy = nft_trans_chain_policy(trans);
4682 static void nf_tables_commit_release(struct nft_trans *trans)
4684 switch (trans->msg_type) {
4685 case NFT_MSG_DELTABLE:
4686 nf_tables_table_destroy(&trans->ctx);
4688 case NFT_MSG_DELCHAIN:
4689 nf_tables_chain_destroy(trans->ctx.chain);
4691 case NFT_MSG_DELRULE:
4692 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4694 case NFT_MSG_DELSET:
4695 nft_set_destroy(nft_trans_set(trans));
4697 case NFT_MSG_DELSETELEM:
4698 nft_set_elem_destroy(nft_trans_elem_set(trans),
4699 nft_trans_elem(trans).priv, true);
4701 case NFT_MSG_DELOBJ:
4702 nft_obj_destroy(nft_trans_obj(trans));
4708 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
4710 struct nft_trans *trans, *next;
4711 struct nft_trans_elem *te;
4713 /* Bump generation counter, invalidate any dump in progress */
4714 while (++net->nft.base_seq == 0);
4716 /* A new generation has just started */
4717 net->nft.gencursor = nft_gencursor_next(net);
4719 /* Make sure all packets have left the previous generation before
4720 * purging old rules.
4724 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4725 switch (trans->msg_type) {
4726 case NFT_MSG_NEWTABLE:
4727 if (nft_trans_table_update(trans)) {
4728 if (!nft_trans_table_enable(trans)) {
4729 nf_tables_table_disable(net,
4732 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4735 nft_clear(net, trans->ctx.table);
4737 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
4738 nft_trans_destroy(trans);
4740 case NFT_MSG_DELTABLE:
4741 list_del_rcu(&trans->ctx.table->list);
4742 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
4744 case NFT_MSG_NEWCHAIN:
4745 if (nft_trans_chain_update(trans))
4746 nft_chain_commit_update(trans);
4748 nft_clear(net, trans->ctx.chain);
4750 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
4751 nft_trans_destroy(trans);
4753 case NFT_MSG_DELCHAIN:
4754 list_del_rcu(&trans->ctx.chain->list);
4755 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
4756 nf_tables_unregister_hooks(trans->ctx.net,
4759 trans->ctx.afi->nops);
4761 case NFT_MSG_NEWRULE:
4762 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4763 nf_tables_rule_notify(&trans->ctx,
4764 nft_trans_rule(trans),
4766 nft_trans_destroy(trans);
4768 case NFT_MSG_DELRULE:
4769 list_del_rcu(&nft_trans_rule(trans)->list);
4770 nf_tables_rule_notify(&trans->ctx,
4771 nft_trans_rule(trans),
4774 case NFT_MSG_NEWSET:
4775 nft_clear(net, nft_trans_set(trans));
4776 /* This avoids hitting -EBUSY when deleting the table
4777 * from the transaction.
4779 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4780 !list_empty(&nft_trans_set(trans)->bindings))
4781 trans->ctx.table->use--;
4783 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4784 NFT_MSG_NEWSET, GFP_KERNEL);
4785 nft_trans_destroy(trans);
4787 case NFT_MSG_DELSET:
4788 list_del_rcu(&nft_trans_set(trans)->list);
4789 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
4790 NFT_MSG_DELSET, GFP_KERNEL);
4792 case NFT_MSG_NEWSETELEM:
4793 te = (struct nft_trans_elem *)trans->data;
4795 te->set->ops->activate(net, te->set, &te->elem);
4796 nf_tables_setelem_notify(&trans->ctx, te->set,
4798 NFT_MSG_NEWSETELEM, 0);
4799 nft_trans_destroy(trans);
4801 case NFT_MSG_DELSETELEM:
4802 te = (struct nft_trans_elem *)trans->data;
4804 nf_tables_setelem_notify(&trans->ctx, te->set,
4806 NFT_MSG_DELSETELEM, 0);
4807 te->set->ops->remove(te->set, &te->elem);
4808 atomic_dec(&te->set->nelems);
4811 case NFT_MSG_NEWOBJ:
4812 nft_clear(net, nft_trans_obj(trans));
4813 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4815 nft_trans_destroy(trans);
4817 case NFT_MSG_DELOBJ:
4818 list_del_rcu(&nft_trans_obj(trans)->list);
4819 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4827 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
4828 list_del(&trans->list);
4829 nf_tables_commit_release(trans);
4832 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
4837 static void nf_tables_abort_release(struct nft_trans *trans)
4839 switch (trans->msg_type) {
4840 case NFT_MSG_NEWTABLE:
4841 nf_tables_table_destroy(&trans->ctx);
4843 case NFT_MSG_NEWCHAIN:
4844 nf_tables_chain_destroy(trans->ctx.chain);
4846 case NFT_MSG_NEWRULE:
4847 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4849 case NFT_MSG_NEWSET:
4850 nft_set_destroy(nft_trans_set(trans));
4852 case NFT_MSG_NEWSETELEM:
4853 nft_set_elem_destroy(nft_trans_elem_set(trans),
4854 nft_trans_elem(trans).priv, true);
4856 case NFT_MSG_NEWOBJ:
4857 nft_obj_destroy(nft_trans_obj(trans));
4863 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
4865 struct nft_trans *trans, *next;
4866 struct nft_trans_elem *te;
4868 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4870 switch (trans->msg_type) {
4871 case NFT_MSG_NEWTABLE:
4872 if (nft_trans_table_update(trans)) {
4873 if (nft_trans_table_enable(trans)) {
4874 nf_tables_table_disable(net,
4877 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4879 nft_trans_destroy(trans);
4881 list_del_rcu(&trans->ctx.table->list);
4884 case NFT_MSG_DELTABLE:
4885 nft_clear(trans->ctx.net, trans->ctx.table);
4886 nft_trans_destroy(trans);
4888 case NFT_MSG_NEWCHAIN:
4889 if (nft_trans_chain_update(trans)) {
4890 free_percpu(nft_trans_chain_stats(trans));
4892 nft_trans_destroy(trans);
4894 trans->ctx.table->use--;
4895 list_del_rcu(&trans->ctx.chain->list);
4896 nf_tables_unregister_hooks(trans->ctx.net,
4899 trans->ctx.afi->nops);
4902 case NFT_MSG_DELCHAIN:
4903 trans->ctx.table->use++;
4904 nft_clear(trans->ctx.net, trans->ctx.chain);
4905 nft_trans_destroy(trans);
4907 case NFT_MSG_NEWRULE:
4908 trans->ctx.chain->use--;
4909 list_del_rcu(&nft_trans_rule(trans)->list);
4911 case NFT_MSG_DELRULE:
4912 trans->ctx.chain->use++;
4913 nft_clear(trans->ctx.net, nft_trans_rule(trans));
4914 nft_trans_destroy(trans);
4916 case NFT_MSG_NEWSET:
4917 trans->ctx.table->use--;
4918 list_del_rcu(&nft_trans_set(trans)->list);
4920 case NFT_MSG_DELSET:
4921 trans->ctx.table->use++;
4922 nft_clear(trans->ctx.net, nft_trans_set(trans));
4923 nft_trans_destroy(trans);
4925 case NFT_MSG_NEWSETELEM:
4926 te = (struct nft_trans_elem *)trans->data;
4928 te->set->ops->remove(te->set, &te->elem);
4929 atomic_dec(&te->set->nelems);
4931 case NFT_MSG_DELSETELEM:
4932 te = (struct nft_trans_elem *)trans->data;
4934 te->set->ops->activate(net, te->set, &te->elem);
4937 nft_trans_destroy(trans);
4939 case NFT_MSG_NEWOBJ:
4940 trans->ctx.table->use--;
4941 list_del_rcu(&nft_trans_obj(trans)->list);
4943 case NFT_MSG_DELOBJ:
4944 trans->ctx.table->use++;
4945 nft_clear(trans->ctx.net, nft_trans_obj(trans));
4946 nft_trans_destroy(trans);
4953 list_for_each_entry_safe_reverse(trans, next,
4954 &net->nft.commit_list, list) {
4955 list_del(&trans->list);
4956 nf_tables_abort_release(trans);
4962 static const struct nfnetlink_subsystem nf_tables_subsys = {
4963 .name = "nf_tables",
4964 .subsys_id = NFNL_SUBSYS_NFTABLES,
4965 .cb_count = NFT_MSG_MAX,
4967 .commit = nf_tables_commit,
4968 .abort = nf_tables_abort,
4971 int nft_chain_validate_dependency(const struct nft_chain *chain,
4972 enum nft_chain_type type)
4974 const struct nft_base_chain *basechain;
4976 if (chain->flags & NFT_BASE_CHAIN) {
4977 basechain = nft_base_chain(chain);
4978 if (basechain->type->type != type)
4983 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4985 int nft_chain_validate_hooks(const struct nft_chain *chain,
4986 unsigned int hook_flags)
4988 struct nft_base_chain *basechain;
4990 if (chain->flags & NFT_BASE_CHAIN) {
4991 basechain = nft_base_chain(chain);
4993 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5001 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5004 * Loop detection - walk through the ruleset beginning at the destination chain
5005 * of a new jump until either the source chain is reached (loop) or all
5006 * reachable chains have been traversed.
5008 * The loop check is performed whenever a new jump verdict is added to an
5009 * expression or verdict map or a verdict map is bound to a new chain.
5012 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5013 const struct nft_chain *chain);
5015 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
5016 struct nft_set *set,
5017 const struct nft_set_iter *iter,
5018 struct nft_set_elem *elem)
5020 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5021 const struct nft_data *data;
5023 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5024 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
5027 data = nft_set_ext_data(ext);
5028 switch (data->verdict.code) {
5031 return nf_tables_check_loops(ctx, data->verdict.chain);
5037 static int nf_tables_check_loops(const struct nft_ctx *ctx,
5038 const struct nft_chain *chain)
5040 const struct nft_rule *rule;
5041 const struct nft_expr *expr, *last;
5042 struct nft_set *set;
5043 struct nft_set_binding *binding;
5044 struct nft_set_iter iter;
5046 if (ctx->chain == chain)
5049 list_for_each_entry(rule, &chain->rules, list) {
5050 nft_rule_for_each_expr(expr, last, rule) {
5051 const struct nft_data *data = NULL;
5054 if (!expr->ops->validate)
5057 err = expr->ops->validate(ctx, expr, &data);
5064 switch (data->verdict.code) {
5067 err = nf_tables_check_loops(ctx,
5068 data->verdict.chain);
5077 list_for_each_entry(set, &ctx->table->sets, list) {
5078 if (!nft_is_active_next(ctx->net, set))
5080 if (!(set->flags & NFT_SET_MAP) ||
5081 set->dtype != NFT_DATA_VERDICT)
5084 list_for_each_entry(binding, &set->bindings, list) {
5085 if (!(binding->flags & NFT_SET_MAP) ||
5086 binding->chain != chain)
5089 iter.genmask = nft_genmask_next(ctx->net);
5093 iter.fn = nf_tables_loop_check_setelem;
5095 set->ops->walk(ctx, set, &iter);
5105 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5107 * @attr: netlink attribute to fetch value from
5108 * @max: maximum value to be stored in dest
5109 * @dest: pointer to the variable
5111 * Parse, check and store a given u32 netlink attribute into variable.
5112 * This function returns -ERANGE if the value goes over maximum value.
5113 * Otherwise a 0 is returned and the attribute value is stored in the
5114 * destination variable.
5116 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
5120 val = ntohl(nla_get_be32(attr));
5127 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5130 * nft_parse_register - parse a register value from a netlink attribute
5132 * @attr: netlink attribute
5134 * Parse and translate a register value from a netlink attribute.
5135 * Registers used to be 128 bit wide, these register numbers will be
5136 * mapped to the corresponding 32 bit register numbers.
5138 unsigned int nft_parse_register(const struct nlattr *attr)
5142 reg = ntohl(nla_get_be32(attr));
5144 case NFT_REG_VERDICT...NFT_REG_4:
5145 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5147 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5150 EXPORT_SYMBOL_GPL(nft_parse_register);
5153 * nft_dump_register - dump a register value to a netlink attribute
5155 * @skb: socket buffer
5156 * @attr: attribute number
5157 * @reg: register number
5159 * Construct a netlink attribute containing the register number. For
5160 * compatibility reasons, register numbers being a multiple of 4 are
5161 * translated to the corresponding 128 bit register numbers.
5163 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5165 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5166 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5168 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5170 return nla_put_be32(skb, attr, htonl(reg));
5172 EXPORT_SYMBOL_GPL(nft_dump_register);
5175 * nft_validate_register_load - validate a load from a register
5177 * @reg: the register number
5178 * @len: the length of the data
5180 * Validate that the input register is one of the general purpose
5181 * registers and that the length of the load is within the bounds.
5183 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
5185 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5189 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
5194 EXPORT_SYMBOL_GPL(nft_validate_register_load);
5197 * nft_validate_register_store - validate an expressions' register store
5199 * @ctx: context of the expression performing the load
5200 * @reg: the destination register number
5201 * @data: the data to load
5202 * @type: the data type
5203 * @len: the length of the data
5205 * Validate that a data load uses the appropriate data type for
5206 * the destination register and the length is within the bounds.
5207 * A value of NULL for the data means that its runtime gathered
5210 int nft_validate_register_store(const struct nft_ctx *ctx,
5211 enum nft_registers reg,
5212 const struct nft_data *data,
5213 enum nft_data_types type, unsigned int len)
5218 case NFT_REG_VERDICT:
5219 if (type != NFT_DATA_VERDICT)
5223 (data->verdict.code == NFT_GOTO ||
5224 data->verdict.code == NFT_JUMP)) {
5225 err = nf_tables_check_loops(ctx, data->verdict.chain);
5229 if (ctx->chain->level + 1 >
5230 data->verdict.chain->level) {
5231 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5233 data->verdict.chain->level = ctx->chain->level + 1;
5239 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
5243 if (reg * NFT_REG32_SIZE + len >
5244 FIELD_SIZEOF(struct nft_regs, data))
5247 if (data != NULL && type != NFT_DATA_VALUE)
5252 EXPORT_SYMBOL_GPL(nft_validate_register_store);
5254 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5255 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5256 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5257 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5260 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5261 struct nft_data_desc *desc, const struct nlattr *nla)
5263 u8 genmask = nft_genmask_next(ctx->net);
5264 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5265 struct nft_chain *chain;
5268 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
5272 if (!tb[NFTA_VERDICT_CODE])
5274 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
5276 switch (data->verdict.code) {
5278 switch (data->verdict.code & NF_VERDICT_MASK) {
5293 if (!tb[NFTA_VERDICT_CHAIN])
5295 chain = nf_tables_chain_lookup(ctx->table,
5296 tb[NFTA_VERDICT_CHAIN], genmask);
5298 return PTR_ERR(chain);
5299 if (chain->flags & NFT_BASE_CHAIN)
5303 data->verdict.chain = chain;
5307 desc->len = sizeof(data->verdict);
5308 desc->type = NFT_DATA_VERDICT;
5312 static void nft_verdict_uninit(const struct nft_data *data)
5314 switch (data->verdict.code) {
5317 data->verdict.chain->use--;
5322 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
5324 struct nlattr *nest;
5326 nest = nla_nest_start(skb, type);
5328 goto nla_put_failure;
5330 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
5331 goto nla_put_failure;
5336 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
5338 goto nla_put_failure;
5340 nla_nest_end(skb, nest);
5347 static int nft_value_init(const struct nft_ctx *ctx,
5348 struct nft_data *data, unsigned int size,
5349 struct nft_data_desc *desc, const struct nlattr *nla)
5359 nla_memcpy(data->data, nla, len);
5360 desc->type = NFT_DATA_VALUE;
5365 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5368 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5371 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
5372 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
5373 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5377 * nft_data_init - parse nf_tables data netlink attributes
5379 * @ctx: context of the expression using the data
5380 * @data: destination struct nft_data
5381 * @size: maximum data length
5382 * @desc: data description
5383 * @nla: netlink attribute containing data
5385 * Parse the netlink data attributes and initialize a struct nft_data.
5386 * The type and length of data are returned in the data description.
5388 * The caller can indicate that it only wants to accept data of type
5389 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5391 int nft_data_init(const struct nft_ctx *ctx,
5392 struct nft_data *data, unsigned int size,
5393 struct nft_data_desc *desc, const struct nlattr *nla)
5395 struct nlattr *tb[NFTA_DATA_MAX + 1];
5398 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
5402 if (tb[NFTA_DATA_VALUE])
5403 return nft_value_init(ctx, data, size, desc,
5404 tb[NFTA_DATA_VALUE]);
5405 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5406 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5409 EXPORT_SYMBOL_GPL(nft_data_init);
5412 * nft_data_uninit - release a nft_data item
5414 * @data: struct nft_data to release
5415 * @type: type of data
5417 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5418 * all others need to be released by calling this function.
5420 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
5422 if (type < NFT_DATA_VERDICT)
5425 case NFT_DATA_VERDICT:
5426 return nft_verdict_uninit(data);
5431 EXPORT_SYMBOL_GPL(nft_data_uninit);
5433 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5434 enum nft_data_types type, unsigned int len)
5436 struct nlattr *nest;
5439 nest = nla_nest_start(skb, attr);
5444 case NFT_DATA_VALUE:
5445 err = nft_value_dump(skb, data, len);
5447 case NFT_DATA_VERDICT:
5448 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
5455 nla_nest_end(skb, nest);
5458 EXPORT_SYMBOL_GPL(nft_data_dump);
5460 static int __net_init nf_tables_init_net(struct net *net)
5462 INIT_LIST_HEAD(&net->nft.af_info);
5463 INIT_LIST_HEAD(&net->nft.commit_list);
5464 net->nft.base_seq = 1;
5468 int __nft_release_basechain(struct nft_ctx *ctx)
5470 struct nft_rule *rule, *nr;
5472 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
5474 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5476 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5477 list_del(&rule->list);
5479 nf_tables_rule_destroy(ctx, rule);
5481 list_del(&ctx->chain->list);
5483 nf_tables_chain_destroy(ctx->chain);
5487 EXPORT_SYMBOL_GPL(__nft_release_basechain);
5489 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5490 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5492 struct nft_table *table, *nt;
5493 struct nft_chain *chain, *nc;
5494 struct nft_object *obj, *ne;
5495 struct nft_rule *rule, *nr;
5496 struct nft_set *set, *ns;
5497 struct nft_ctx ctx = {
5502 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5503 list_for_each_entry(chain, &table->chains, list)
5504 nf_tables_unregister_hooks(net, table, chain,
5506 /* No packets are walking on these chains anymore. */
5508 list_for_each_entry(chain, &table->chains, list) {
5510 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5511 list_del(&rule->list);
5513 nf_tables_rule_destroy(&ctx, rule);
5516 list_for_each_entry_safe(set, ns, &table->sets, list) {
5517 list_del(&set->list);
5519 nft_set_destroy(set);
5521 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5522 list_del(&obj->list);
5524 nft_obj_destroy(obj);
5526 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5527 list_del(&chain->list);
5529 nf_tables_chain_destroy(chain);
5531 list_del(&table->list);
5532 nf_tables_table_destroy(&ctx);
5536 static struct pernet_operations nf_tables_net_ops = {
5537 .init = nf_tables_init_net,
5540 static int __init nf_tables_module_init(void)
5544 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5551 err = nf_tables_core_module_init();
5555 err = nfnetlink_subsys_register(&nf_tables_subsys);
5559 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
5560 return register_pernet_subsys(&nf_tables_net_ops);
5562 nf_tables_core_module_exit();
5569 static void __exit nf_tables_module_exit(void)
5571 unregister_pernet_subsys(&nf_tables_net_ops);
5572 nfnetlink_subsys_unregister(&nf_tables_subsys);
5574 nf_tables_core_module_exit();
5578 module_init(nf_tables_module_init);
5579 module_exit(nf_tables_module_exit);
5581 MODULE_LICENSE("GPL");
5582 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5583 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);