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/vmalloc.h>
17 #include <linux/netfilter.h>
18 #include <linux/netfilter/nfnetlink.h>
19 #include <linux/netfilter/nf_tables.h>
20 #include <net/netfilter/nf_flow_table.h>
21 #include <net/netfilter/nf_tables_core.h>
22 #include <net/netfilter/nf_tables.h>
23 #include <net/net_namespace.h>
26 static LIST_HEAD(nf_tables_expressions);
27 static LIST_HEAD(nf_tables_objects);
28 static LIST_HEAD(nf_tables_flowtables);
29 static u64 table_handle;
32 NFT_VALIDATE_SKIP = 0,
37 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
38 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
39 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
41 static const struct rhashtable_params nft_chain_ht_params = {
42 .head_offset = offsetof(struct nft_chain, rhlhead),
43 .key_offset = offsetof(struct nft_chain, name),
44 .hashfn = nft_chain_hash,
45 .obj_hashfn = nft_chain_hash_obj,
46 .obj_cmpfn = nft_chain_hash_cmp,
48 .automatic_shrinking = true,
51 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
53 switch (net->nft.validate_state) {
54 case NFT_VALIDATE_SKIP:
55 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
57 case NFT_VALIDATE_NEED:
60 if (new_validate_state == NFT_VALIDATE_NEED)
64 net->nft.validate_state = new_validate_state;
67 static void nft_ctx_init(struct nft_ctx *ctx,
69 const struct sk_buff *skb,
70 const struct nlmsghdr *nlh,
72 struct nft_table *table,
73 struct nft_chain *chain,
74 const struct nlattr * const *nla)
81 ctx->portid = NETLINK_CB(skb).portid;
82 ctx->report = nlmsg_report(nlh);
83 ctx->seq = nlh->nlmsg_seq;
86 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
87 int msg_type, u32 size, gfp_t gfp)
89 struct nft_trans *trans;
91 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
95 trans->msg_type = msg_type;
101 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
102 int msg_type, u32 size)
104 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
107 static void nft_trans_destroy(struct nft_trans *trans)
109 list_del(&trans->list);
113 static int nf_tables_register_hook(struct net *net,
114 const struct nft_table *table,
115 struct nft_chain *chain)
117 const struct nft_base_chain *basechain;
118 const struct nf_hook_ops *ops;
120 if (table->flags & NFT_TABLE_F_DORMANT ||
121 !nft_is_base_chain(chain))
124 basechain = nft_base_chain(chain);
125 ops = &basechain->ops;
127 if (basechain->type->ops_register)
128 return basechain->type->ops_register(net, ops);
130 return nf_register_net_hook(net, ops);
133 static void nf_tables_unregister_hook(struct net *net,
134 const struct nft_table *table,
135 struct nft_chain *chain)
137 const struct nft_base_chain *basechain;
138 const struct nf_hook_ops *ops;
140 if (table->flags & NFT_TABLE_F_DORMANT ||
141 !nft_is_base_chain(chain))
143 basechain = nft_base_chain(chain);
144 ops = &basechain->ops;
146 if (basechain->type->ops_unregister)
147 return basechain->type->ops_unregister(net, ops);
149 nf_unregister_net_hook(net, ops);
152 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
154 struct nft_trans *trans;
156 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
160 if (msg_type == NFT_MSG_NEWTABLE)
161 nft_activate_next(ctx->net, ctx->table);
163 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
167 static int nft_deltable(struct nft_ctx *ctx)
171 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
175 nft_deactivate_next(ctx->net, ctx->table);
179 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
181 struct nft_trans *trans;
183 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
187 if (msg_type == NFT_MSG_NEWCHAIN)
188 nft_activate_next(ctx->net, ctx->chain);
190 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
194 static int nft_delchain(struct nft_ctx *ctx)
198 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
203 nft_deactivate_next(ctx->net, ctx->chain);
208 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
209 struct nft_rule *rule)
211 struct nft_expr *expr;
213 expr = nft_expr_first(rule);
214 while (expr != nft_expr_last(rule) && expr->ops) {
215 if (expr->ops->activate)
216 expr->ops->activate(ctx, expr);
218 expr = nft_expr_next(expr);
222 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
223 struct nft_rule *rule)
225 struct nft_expr *expr;
227 expr = nft_expr_first(rule);
228 while (expr != nft_expr_last(rule) && expr->ops) {
229 if (expr->ops->deactivate)
230 expr->ops->deactivate(ctx, expr);
232 expr = nft_expr_next(expr);
237 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
239 /* You cannot delete the same rule twice */
240 if (nft_is_active_next(ctx->net, rule)) {
241 nft_deactivate_next(ctx->net, rule);
248 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
249 struct nft_rule *rule)
251 struct nft_trans *trans;
253 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
257 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
258 nft_trans_rule_id(trans) =
259 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
261 nft_trans_rule(trans) = rule;
262 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
267 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
269 struct nft_trans *trans;
272 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
276 err = nf_tables_delrule_deactivate(ctx, rule);
278 nft_trans_destroy(trans);
281 nft_rule_expr_deactivate(ctx, rule);
286 static int nft_delrule_by_chain(struct nft_ctx *ctx)
288 struct nft_rule *rule;
291 list_for_each_entry(rule, &ctx->chain->rules, list) {
292 err = nft_delrule(ctx, rule);
299 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
302 struct nft_trans *trans;
304 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
308 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
309 nft_trans_set_id(trans) =
310 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
311 nft_activate_next(ctx->net, set);
313 nft_trans_set(trans) = set;
314 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
319 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
323 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
327 nft_deactivate_next(ctx->net, set);
333 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
334 struct nft_object *obj)
336 struct nft_trans *trans;
338 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
342 if (msg_type == NFT_MSG_NEWOBJ)
343 nft_activate_next(ctx->net, obj);
345 nft_trans_obj(trans) = obj;
346 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
351 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
355 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
359 nft_deactivate_next(ctx->net, obj);
365 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
366 struct nft_flowtable *flowtable)
368 struct nft_trans *trans;
370 trans = nft_trans_alloc(ctx, msg_type,
371 sizeof(struct nft_trans_flowtable));
375 if (msg_type == NFT_MSG_NEWFLOWTABLE)
376 nft_activate_next(ctx->net, flowtable);
378 nft_trans_flowtable(trans) = flowtable;
379 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
384 static int nft_delflowtable(struct nft_ctx *ctx,
385 struct nft_flowtable *flowtable)
389 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
393 nft_deactivate_next(ctx->net, flowtable);
403 static struct nft_table *nft_table_lookup(const struct net *net,
404 const struct nlattr *nla,
405 u8 family, u8 genmask)
407 struct nft_table *table;
410 return ERR_PTR(-EINVAL);
412 list_for_each_entry_rcu(table, &net->nft.tables, list) {
413 if (!nla_strcmp(nla, table->name) &&
414 table->family == family &&
415 nft_active_genmask(table, genmask))
419 return ERR_PTR(-ENOENT);
422 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
423 const struct nlattr *nla,
426 struct nft_table *table;
428 list_for_each_entry(table, &net->nft.tables, list) {
429 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
430 nft_active_genmask(table, genmask))
434 return ERR_PTR(-ENOENT);
437 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
439 return ++table->hgenerator;
442 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
444 static const struct nft_chain_type *
445 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
449 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
450 if (chain_type[family][i] != NULL &&
451 !nla_strcmp(nla, chain_type[family][i]->name))
452 return chain_type[family][i];
457 static const struct nft_chain_type *
458 nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family, bool autoload)
460 const struct nft_chain_type *type;
462 type = __nf_tables_chain_type_lookup(nla, family);
465 #ifdef CONFIG_MODULES
467 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
468 request_module("nft-chain-%u-%.*s", family,
469 nla_len(nla), (const char *)nla_data(nla));
470 nfnl_lock(NFNL_SUBSYS_NFTABLES);
471 type = __nf_tables_chain_type_lookup(nla, family);
473 return ERR_PTR(-EAGAIN);
476 return ERR_PTR(-ENOENT);
479 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
480 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
481 .len = NFT_TABLE_MAXNAMELEN - 1 },
482 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
483 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
486 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
487 u32 portid, u32 seq, int event, u32 flags,
488 int family, const struct nft_table *table)
490 struct nlmsghdr *nlh;
491 struct nfgenmsg *nfmsg;
493 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
494 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
496 goto nla_put_failure;
498 nfmsg = nlmsg_data(nlh);
499 nfmsg->nfgen_family = family;
500 nfmsg->version = NFNETLINK_V0;
501 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
503 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
504 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
505 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
506 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
508 goto nla_put_failure;
514 nlmsg_trim(skb, nlh);
518 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
524 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
527 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
531 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
532 event, 0, ctx->family, ctx->table);
538 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
539 ctx->report, GFP_KERNEL);
542 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
545 static int nf_tables_dump_tables(struct sk_buff *skb,
546 struct netlink_callback *cb)
548 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
549 const struct nft_table *table;
550 unsigned int idx = 0, s_idx = cb->args[0];
551 struct net *net = sock_net(skb->sk);
552 int family = nfmsg->nfgen_family;
555 cb->seq = net->nft.base_seq;
557 list_for_each_entry_rcu(table, &net->nft.tables, list) {
558 if (family != NFPROTO_UNSPEC && family != table->family)
564 memset(&cb->args[1], 0,
565 sizeof(cb->args) - sizeof(cb->args[0]));
566 if (!nft_is_active(net, table))
568 if (nf_tables_fill_table_info(skb, net,
569 NETLINK_CB(cb->skb).portid,
571 NFT_MSG_NEWTABLE, NLM_F_MULTI,
572 table->family, table) < 0)
575 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
585 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
586 const struct nlmsghdr *nlh,
587 struct netlink_dump_control *c)
591 if (!try_module_get(THIS_MODULE))
595 err = netlink_dump_start(nlsk, skb, nlh, c);
597 module_put(THIS_MODULE);
602 /* called with rcu_read_lock held */
603 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
604 struct sk_buff *skb, const struct nlmsghdr *nlh,
605 const struct nlattr * const nla[],
606 struct netlink_ext_ack *extack)
608 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
609 u8 genmask = nft_genmask_cur(net);
610 const struct nft_table *table;
611 struct sk_buff *skb2;
612 int family = nfmsg->nfgen_family;
615 if (nlh->nlmsg_flags & NLM_F_DUMP) {
616 struct netlink_dump_control c = {
617 .dump = nf_tables_dump_tables,
618 .module = THIS_MODULE,
621 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
624 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
626 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
627 return PTR_ERR(table);
630 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
634 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
635 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
640 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
647 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
649 struct nft_chain *chain;
652 list_for_each_entry(chain, &table->chains, list) {
653 if (!nft_is_active_next(net, chain))
655 if (!nft_is_base_chain(chain))
658 if (cnt && i++ == cnt)
661 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
665 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
667 struct nft_chain *chain;
670 list_for_each_entry(chain, &table->chains, list) {
671 if (!nft_is_active_next(net, chain))
673 if (!nft_is_base_chain(chain))
676 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
685 nft_table_disable(net, table, i);
689 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
691 nft_table_disable(net, table, 0);
694 static int nf_tables_updtable(struct nft_ctx *ctx)
696 struct nft_trans *trans;
700 if (!ctx->nla[NFTA_TABLE_FLAGS])
703 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
704 if (flags & ~NFT_TABLE_F_DORMANT)
707 if (flags == ctx->table->flags)
710 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
711 sizeof(struct nft_trans_table));
715 if ((flags & NFT_TABLE_F_DORMANT) &&
716 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
717 nft_trans_table_enable(trans) = false;
718 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
719 ctx->table->flags & NFT_TABLE_F_DORMANT) {
720 ret = nf_tables_table_enable(ctx->net, ctx->table);
722 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
723 nft_trans_table_enable(trans) = true;
729 nft_trans_table_update(trans) = true;
730 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
733 nft_trans_destroy(trans);
737 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
739 const char *name = data;
741 return jhash(name, strlen(name), seed);
744 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
746 const struct nft_chain *chain = data;
748 return nft_chain_hash(chain->name, 0, seed);
751 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
754 const struct nft_chain *chain = ptr;
755 const char *name = arg->key;
757 return strcmp(chain->name, name);
760 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
761 struct sk_buff *skb, const struct nlmsghdr *nlh,
762 const struct nlattr * const nla[],
763 struct netlink_ext_ack *extack)
765 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
766 u8 genmask = nft_genmask_next(net);
767 int family = nfmsg->nfgen_family;
768 const struct nlattr *attr;
769 struct nft_table *table;
774 attr = nla[NFTA_TABLE_NAME];
775 table = nft_table_lookup(net, attr, family, genmask);
777 if (PTR_ERR(table) != -ENOENT)
778 return PTR_ERR(table);
780 if (nlh->nlmsg_flags & NLM_F_EXCL) {
781 NL_SET_BAD_ATTR(extack, attr);
784 if (nlh->nlmsg_flags & NLM_F_REPLACE)
787 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
788 return nf_tables_updtable(&ctx);
791 if (nla[NFTA_TABLE_FLAGS]) {
792 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
793 if (flags & ~NFT_TABLE_F_DORMANT)
798 table = kzalloc(sizeof(*table), GFP_KERNEL);
802 table->name = nla_strdup(attr, GFP_KERNEL);
803 if (table->name == NULL)
806 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
810 INIT_LIST_HEAD(&table->chains);
811 INIT_LIST_HEAD(&table->sets);
812 INIT_LIST_HEAD(&table->objects);
813 INIT_LIST_HEAD(&table->flowtables);
814 table->family = family;
815 table->flags = flags;
816 table->handle = ++table_handle;
818 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
819 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
823 list_add_tail_rcu(&table->list, &net->nft.tables);
826 rhltable_destroy(&table->chains_ht);
835 static int nft_flush_table(struct nft_ctx *ctx)
837 struct nft_flowtable *flowtable, *nft;
838 struct nft_chain *chain, *nc;
839 struct nft_object *obj, *ne;
840 struct nft_set *set, *ns;
843 list_for_each_entry(chain, &ctx->table->chains, list) {
844 if (!nft_is_active_next(ctx->net, chain))
849 err = nft_delrule_by_chain(ctx);
854 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
855 if (!nft_is_active_next(ctx->net, set))
858 if (nft_set_is_anonymous(set) &&
859 !list_empty(&set->bindings))
862 err = nft_delset(ctx, set);
867 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
868 err = nft_delflowtable(ctx, flowtable);
873 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
874 err = nft_delobj(ctx, obj);
879 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
880 if (!nft_is_active_next(ctx->net, chain))
885 err = nft_delchain(ctx);
890 err = nft_deltable(ctx);
895 static int nft_flush(struct nft_ctx *ctx, int family)
897 struct nft_table *table, *nt;
898 const struct nlattr * const *nla = ctx->nla;
901 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
902 if (family != AF_UNSPEC && table->family != family)
905 ctx->family = table->family;
907 if (!nft_is_active_next(ctx->net, table))
910 if (nla[NFTA_TABLE_NAME] &&
911 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
916 err = nft_flush_table(ctx);
924 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
925 struct sk_buff *skb, const struct nlmsghdr *nlh,
926 const struct nlattr * const nla[],
927 struct netlink_ext_ack *extack)
929 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
930 u8 genmask = nft_genmask_next(net);
931 int family = nfmsg->nfgen_family;
932 const struct nlattr *attr;
933 struct nft_table *table;
936 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
937 if (family == AF_UNSPEC ||
938 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
939 return nft_flush(&ctx, family);
941 if (nla[NFTA_TABLE_HANDLE]) {
942 attr = nla[NFTA_TABLE_HANDLE];
943 table = nft_table_lookup_byhandle(net, attr, genmask);
945 attr = nla[NFTA_TABLE_NAME];
946 table = nft_table_lookup(net, attr, family, genmask);
950 NL_SET_BAD_ATTR(extack, attr);
951 return PTR_ERR(table);
954 if (nlh->nlmsg_flags & NLM_F_NONREC &&
961 return nft_flush_table(&ctx);
964 static void nf_tables_table_destroy(struct nft_ctx *ctx)
966 BUG_ON(ctx->table->use > 0);
968 rhltable_destroy(&ctx->table->chains_ht);
969 kfree(ctx->table->name);
973 void nft_register_chain_type(const struct nft_chain_type *ctype)
975 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
978 nfnl_lock(NFNL_SUBSYS_NFTABLES);
979 if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) {
980 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
983 chain_type[ctype->family][ctype->type] = ctype;
984 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
986 EXPORT_SYMBOL_GPL(nft_register_chain_type);
988 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
990 nfnl_lock(NFNL_SUBSYS_NFTABLES);
991 chain_type[ctype->family][ctype->type] = NULL;
992 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
994 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1000 static struct nft_chain *
1001 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1003 struct nft_chain *chain;
1005 list_for_each_entry(chain, &table->chains, list) {
1006 if (chain->handle == handle &&
1007 nft_active_genmask(chain, genmask))
1011 return ERR_PTR(-ENOENT);
1014 static struct nft_chain *nft_chain_lookup(struct nft_table *table,
1015 const struct nlattr *nla, u8 genmask)
1017 char search[NFT_CHAIN_MAXNAMELEN + 1];
1018 struct rhlist_head *tmp, *list;
1019 struct nft_chain *chain;
1022 return ERR_PTR(-EINVAL);
1024 nla_strlcpy(search, nla, sizeof(search));
1026 WARN_ON(!rcu_read_lock_held() &&
1027 !lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
1029 chain = ERR_PTR(-ENOENT);
1031 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1035 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1036 if (nft_active_genmask(chain, genmask))
1039 chain = ERR_PTR(-ENOENT);
1045 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1046 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1047 .len = NFT_TABLE_MAXNAMELEN - 1 },
1048 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1049 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1050 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1051 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1052 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1053 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
1054 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1057 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1058 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1059 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1060 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1061 .len = IFNAMSIZ - 1 },
1064 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1066 struct nft_stats *cpu_stats, total;
1067 struct nlattr *nest;
1072 memset(&total, 0, sizeof(total));
1073 for_each_possible_cpu(cpu) {
1074 cpu_stats = per_cpu_ptr(stats, cpu);
1076 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1077 pkts = cpu_stats->pkts;
1078 bytes = cpu_stats->bytes;
1079 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1081 total.bytes += bytes;
1083 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
1085 goto nla_put_failure;
1087 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1088 NFTA_COUNTER_PAD) ||
1089 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1091 goto nla_put_failure;
1093 nla_nest_end(skb, nest);
1100 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1101 u32 portid, u32 seq, int event, u32 flags,
1102 int family, const struct nft_table *table,
1103 const struct nft_chain *chain)
1105 struct nlmsghdr *nlh;
1106 struct nfgenmsg *nfmsg;
1108 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1109 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1111 goto nla_put_failure;
1113 nfmsg = nlmsg_data(nlh);
1114 nfmsg->nfgen_family = family;
1115 nfmsg->version = NFNETLINK_V0;
1116 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1118 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1119 goto nla_put_failure;
1120 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1122 goto nla_put_failure;
1123 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1124 goto nla_put_failure;
1126 if (nft_is_base_chain(chain)) {
1127 const struct nft_base_chain *basechain = nft_base_chain(chain);
1128 const struct nf_hook_ops *ops = &basechain->ops;
1129 struct nlattr *nest;
1131 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1133 goto nla_put_failure;
1134 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1135 goto nla_put_failure;
1136 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1137 goto nla_put_failure;
1138 if (basechain->dev_name[0] &&
1139 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1140 goto nla_put_failure;
1141 nla_nest_end(skb, nest);
1143 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1144 htonl(basechain->policy)))
1145 goto nla_put_failure;
1147 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1148 goto nla_put_failure;
1150 if (basechain->stats && nft_dump_stats(skb, basechain->stats))
1151 goto nla_put_failure;
1154 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1155 goto nla_put_failure;
1157 nlmsg_end(skb, nlh);
1161 nlmsg_trim(skb, nlh);
1165 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1167 struct sk_buff *skb;
1171 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1174 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1178 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1179 event, 0, ctx->family, ctx->table,
1186 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1187 ctx->report, GFP_KERNEL);
1190 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1193 static int nf_tables_dump_chains(struct sk_buff *skb,
1194 struct netlink_callback *cb)
1196 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1197 const struct nft_table *table;
1198 const struct nft_chain *chain;
1199 unsigned int idx = 0, s_idx = cb->args[0];
1200 struct net *net = sock_net(skb->sk);
1201 int family = nfmsg->nfgen_family;
1204 cb->seq = net->nft.base_seq;
1206 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1207 if (family != NFPROTO_UNSPEC && family != table->family)
1210 list_for_each_entry_rcu(chain, &table->chains, list) {
1214 memset(&cb->args[1], 0,
1215 sizeof(cb->args) - sizeof(cb->args[0]));
1216 if (!nft_is_active(net, chain))
1218 if (nf_tables_fill_chain_info(skb, net,
1219 NETLINK_CB(cb->skb).portid,
1223 table->family, table,
1227 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1238 /* called with rcu_read_lock held */
1239 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1240 struct sk_buff *skb, const struct nlmsghdr *nlh,
1241 const struct nlattr * const nla[],
1242 struct netlink_ext_ack *extack)
1244 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1245 u8 genmask = nft_genmask_cur(net);
1246 const struct nft_chain *chain;
1247 struct nft_table *table;
1248 struct sk_buff *skb2;
1249 int family = nfmsg->nfgen_family;
1252 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1253 struct netlink_dump_control c = {
1254 .dump = nf_tables_dump_chains,
1255 .module = THIS_MODULE,
1258 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1261 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1262 if (IS_ERR(table)) {
1263 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1264 return PTR_ERR(table);
1267 chain = nft_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1268 if (IS_ERR(chain)) {
1269 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1270 return PTR_ERR(chain);
1273 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1277 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1278 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1279 family, table, chain);
1283 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1290 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1291 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1292 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1295 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1297 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1298 struct nft_stats __percpu *newstats;
1299 struct nft_stats *stats;
1302 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1305 return ERR_PTR(err);
1307 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1308 return ERR_PTR(-EINVAL);
1310 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1311 if (newstats == NULL)
1312 return ERR_PTR(-ENOMEM);
1314 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1315 * are not exposed to userspace.
1318 stats = this_cpu_ptr(newstats);
1319 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1320 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1326 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1327 struct nft_stats __percpu *newstats)
1329 struct nft_stats __percpu *oldstats;
1331 if (newstats == NULL)
1335 oldstats = nfnl_dereference(chain->stats, NFNL_SUBSYS_NFTABLES);
1336 rcu_assign_pointer(chain->stats, newstats);
1338 free_percpu(oldstats);
1340 rcu_assign_pointer(chain->stats, newstats);
1341 static_branch_inc(&nft_counters_enabled);
1345 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1347 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1348 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1354 /* should be NULL either via abort or via successful commit */
1355 WARN_ON_ONCE(chain->rules_next);
1356 kvfree(chain->rules_next);
1359 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1361 struct nft_chain *chain = ctx->chain;
1363 BUG_ON(chain->use > 0);
1365 /* no concurrent access possible anymore */
1366 nf_tables_chain_free_chain_rules(chain);
1368 if (nft_is_base_chain(chain)) {
1369 struct nft_base_chain *basechain = nft_base_chain(chain);
1371 module_put(basechain->type->owner);
1372 free_percpu(basechain->stats);
1373 if (basechain->stats)
1374 static_branch_dec(&nft_counters_enabled);
1383 struct nft_chain_hook {
1386 const struct nft_chain_type *type;
1387 struct net_device *dev;
1390 static int nft_chain_parse_hook(struct net *net,
1391 const struct nlattr * const nla[],
1392 struct nft_chain_hook *hook, u8 family,
1395 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1396 const struct nft_chain_type *type;
1397 struct net_device *dev;
1400 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1401 nft_hook_policy, NULL);
1405 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1406 ha[NFTA_HOOK_PRIORITY] == NULL)
1409 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1410 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1412 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1413 if (nla[NFTA_CHAIN_TYPE]) {
1414 type = nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
1417 return PTR_ERR(type);
1419 if (!(type->hook_mask & (1 << hook->num)))
1422 if (type->type == NFT_CHAIN_T_NAT &&
1423 hook->priority <= NF_IP_PRI_CONNTRACK)
1426 if (!try_module_get(type->owner))
1432 if (family == NFPROTO_NETDEV) {
1433 char ifname[IFNAMSIZ];
1435 if (!ha[NFTA_HOOK_DEV]) {
1436 module_put(type->owner);
1440 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1441 dev = __dev_get_by_name(net, ifname);
1443 module_put(type->owner);
1447 } else if (ha[NFTA_HOOK_DEV]) {
1448 module_put(type->owner);
1455 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1457 module_put(hook->type->owner);
1460 struct nft_rules_old {
1462 struct nft_rule **start;
1465 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1468 if (alloc > INT_MAX)
1471 alloc += 1; /* NULL, ends rules */
1472 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1475 alloc *= sizeof(struct nft_rule *);
1476 alloc += sizeof(struct nft_rules_old);
1478 return kvmalloc(alloc, GFP_KERNEL);
1481 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1482 u8 policy, bool create)
1484 const struct nlattr * const *nla = ctx->nla;
1485 struct nft_table *table = ctx->table;
1486 struct nft_base_chain *basechain;
1487 struct nft_stats __percpu *stats;
1488 struct net *net = ctx->net;
1489 struct nft_chain *chain;
1490 struct nft_rule **rules;
1493 if (table->use == UINT_MAX)
1496 if (nla[NFTA_CHAIN_HOOK]) {
1497 struct nft_chain_hook hook;
1498 struct nf_hook_ops *ops;
1500 err = nft_chain_parse_hook(net, nla, &hook, family, create);
1504 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1505 if (basechain == NULL) {
1506 nft_chain_release_hook(&hook);
1510 if (hook.dev != NULL)
1511 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1513 if (nla[NFTA_CHAIN_COUNTERS]) {
1514 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1515 if (IS_ERR(stats)) {
1516 nft_chain_release_hook(&hook);
1518 return PTR_ERR(stats);
1520 basechain->stats = stats;
1521 static_branch_inc(&nft_counters_enabled);
1524 basechain->type = hook.type;
1525 chain = &basechain->chain;
1527 ops = &basechain->ops;
1529 ops->hooknum = hook.num;
1530 ops->priority = hook.priority;
1532 ops->hook = hook.type->hooks[ops->hooknum];
1533 ops->dev = hook.dev;
1535 chain->flags |= NFT_BASE_CHAIN;
1536 basechain->policy = policy;
1538 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1544 INIT_LIST_HEAD(&chain->rules);
1545 chain->handle = nf_tables_alloc_handle(table);
1546 chain->table = table;
1547 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1553 rules = nf_tables_chain_alloc_rules(chain, 0);
1560 rcu_assign_pointer(chain->rules_gen_0, rules);
1561 rcu_assign_pointer(chain->rules_gen_1, rules);
1563 err = nf_tables_register_hook(net, table, chain);
1567 err = rhltable_insert_key(&table->chains_ht, chain->name,
1568 &chain->rhlhead, nft_chain_ht_params);
1572 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1574 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1575 nft_chain_ht_params);
1580 list_add_tail_rcu(&chain->list, &table->chains);
1584 nf_tables_unregister_hook(net, table, chain);
1586 nf_tables_chain_destroy(ctx);
1591 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
1594 const struct nlattr * const *nla = ctx->nla;
1595 struct nft_table *table = ctx->table;
1596 struct nft_chain *chain = ctx->chain;
1597 struct nft_base_chain *basechain;
1598 struct nft_stats *stats = NULL;
1599 struct nft_chain_hook hook;
1600 const struct nlattr *name;
1601 struct nf_hook_ops *ops;
1602 struct nft_trans *trans;
1605 if (nla[NFTA_CHAIN_HOOK]) {
1606 if (!nft_is_base_chain(chain))
1609 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
1614 basechain = nft_base_chain(chain);
1615 if (basechain->type != hook.type) {
1616 nft_chain_release_hook(&hook);
1620 ops = &basechain->ops;
1621 if (ops->hooknum != hook.num ||
1622 ops->priority != hook.priority ||
1623 ops->dev != hook.dev) {
1624 nft_chain_release_hook(&hook);
1627 nft_chain_release_hook(&hook);
1630 if (nla[NFTA_CHAIN_HANDLE] &&
1631 nla[NFTA_CHAIN_NAME]) {
1632 struct nft_chain *chain2;
1634 chain2 = nft_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1635 if (!IS_ERR(chain2))
1639 if (nla[NFTA_CHAIN_COUNTERS]) {
1640 if (!nft_is_base_chain(chain))
1643 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1645 return PTR_ERR(stats);
1648 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1649 sizeof(struct nft_trans_chain));
1650 if (trans == NULL) {
1655 nft_trans_chain_stats(trans) = stats;
1656 nft_trans_chain_update(trans) = true;
1658 if (nla[NFTA_CHAIN_POLICY])
1659 nft_trans_chain_policy(trans) = policy;
1661 nft_trans_chain_policy(trans) = -1;
1663 name = nla[NFTA_CHAIN_NAME];
1664 if (nla[NFTA_CHAIN_HANDLE] && name) {
1665 nft_trans_chain_name(trans) =
1666 nla_strdup(name, GFP_KERNEL);
1667 if (!nft_trans_chain_name(trans)) {
1673 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1678 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1679 struct sk_buff *skb, const struct nlmsghdr *nlh,
1680 const struct nlattr * const nla[],
1681 struct netlink_ext_ack *extack)
1683 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1684 u8 genmask = nft_genmask_next(net);
1685 int family = nfmsg->nfgen_family;
1686 const struct nlattr *attr;
1687 struct nft_table *table;
1688 struct nft_chain *chain;
1689 u8 policy = NF_ACCEPT;
1694 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1696 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1697 if (IS_ERR(table)) {
1698 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1699 return PTR_ERR(table);
1703 attr = nla[NFTA_CHAIN_NAME];
1705 if (nla[NFTA_CHAIN_HANDLE]) {
1706 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1707 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1708 if (IS_ERR(chain)) {
1709 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
1710 return PTR_ERR(chain);
1712 attr = nla[NFTA_CHAIN_HANDLE];
1714 chain = nft_chain_lookup(table, attr, genmask);
1715 if (IS_ERR(chain)) {
1716 if (PTR_ERR(chain) != -ENOENT) {
1717 NL_SET_BAD_ATTR(extack, attr);
1718 return PTR_ERR(chain);
1724 if (nla[NFTA_CHAIN_POLICY]) {
1725 if (chain != NULL &&
1726 !nft_is_base_chain(chain)) {
1727 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1731 if (chain == NULL &&
1732 nla[NFTA_CHAIN_HOOK] == NULL) {
1733 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1737 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1747 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1749 if (chain != NULL) {
1750 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1751 NL_SET_BAD_ATTR(extack, attr);
1754 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1757 return nf_tables_updchain(&ctx, genmask, policy, create);
1760 return nf_tables_addchain(&ctx, family, genmask, policy, create);
1763 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1764 struct sk_buff *skb, const struct nlmsghdr *nlh,
1765 const struct nlattr * const nla[],
1766 struct netlink_ext_ack *extack)
1768 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1769 u8 genmask = nft_genmask_next(net);
1770 int family = nfmsg->nfgen_family;
1771 const struct nlattr *attr;
1772 struct nft_table *table;
1773 struct nft_chain *chain;
1774 struct nft_rule *rule;
1780 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1781 if (IS_ERR(table)) {
1782 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1783 return PTR_ERR(table);
1786 if (nla[NFTA_CHAIN_HANDLE]) {
1787 attr = nla[NFTA_CHAIN_HANDLE];
1788 handle = be64_to_cpu(nla_get_be64(attr));
1789 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1791 attr = nla[NFTA_CHAIN_NAME];
1792 chain = nft_chain_lookup(table, attr, genmask);
1794 if (IS_ERR(chain)) {
1795 NL_SET_BAD_ATTR(extack, attr);
1796 return PTR_ERR(chain);
1799 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1803 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1806 list_for_each_entry(rule, &chain->rules, list) {
1807 if (!nft_is_active_next(net, rule))
1811 err = nft_delrule(&ctx, rule);
1816 /* There are rules and elements that are still holding references to us,
1817 * we cannot do a recursive removal in this case.
1820 NL_SET_BAD_ATTR(extack, attr);
1824 return nft_delchain(&ctx);
1832 * nft_register_expr - register nf_tables expr type
1835 * Registers the expr type for use with nf_tables. Returns zero on
1836 * success or a negative errno code otherwise.
1838 int nft_register_expr(struct nft_expr_type *type)
1840 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1841 if (type->family == NFPROTO_UNSPEC)
1842 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1844 list_add_rcu(&type->list, &nf_tables_expressions);
1845 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1848 EXPORT_SYMBOL_GPL(nft_register_expr);
1851 * nft_unregister_expr - unregister nf_tables expr type
1854 * Unregisters the expr typefor use with nf_tables.
1856 void nft_unregister_expr(struct nft_expr_type *type)
1858 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1859 list_del_rcu(&type->list);
1860 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1862 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1864 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1867 const struct nft_expr_type *type;
1869 list_for_each_entry(type, &nf_tables_expressions, list) {
1870 if (!nla_strcmp(nla, type->name) &&
1871 (!type->family || type->family == family))
1877 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1880 const struct nft_expr_type *type;
1883 return ERR_PTR(-EINVAL);
1885 type = __nft_expr_type_get(family, nla);
1886 if (type != NULL && try_module_get(type->owner))
1889 #ifdef CONFIG_MODULES
1891 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1892 request_module("nft-expr-%u-%.*s", family,
1893 nla_len(nla), (char *)nla_data(nla));
1894 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1895 if (__nft_expr_type_get(family, nla))
1896 return ERR_PTR(-EAGAIN);
1898 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1899 request_module("nft-expr-%.*s",
1900 nla_len(nla), (char *)nla_data(nla));
1901 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1902 if (__nft_expr_type_get(family, nla))
1903 return ERR_PTR(-EAGAIN);
1906 return ERR_PTR(-ENOENT);
1909 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1910 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1911 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1914 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1915 const struct nft_expr *expr)
1917 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1918 goto nla_put_failure;
1920 if (expr->ops->dump) {
1921 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1923 goto nla_put_failure;
1924 if (expr->ops->dump(skb, expr) < 0)
1925 goto nla_put_failure;
1926 nla_nest_end(skb, data);
1935 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1936 const struct nft_expr *expr)
1938 struct nlattr *nest;
1940 nest = nla_nest_start(skb, attr);
1942 goto nla_put_failure;
1943 if (nf_tables_fill_expr_info(skb, expr) < 0)
1944 goto nla_put_failure;
1945 nla_nest_end(skb, nest);
1952 struct nft_expr_info {
1953 const struct nft_expr_ops *ops;
1954 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1957 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1958 const struct nlattr *nla,
1959 struct nft_expr_info *info)
1961 const struct nft_expr_type *type;
1962 const struct nft_expr_ops *ops;
1963 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1966 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
1970 type = nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
1972 return PTR_ERR(type);
1974 if (tb[NFTA_EXPR_DATA]) {
1975 err = nla_parse_nested(info->tb, type->maxattr,
1976 tb[NFTA_EXPR_DATA], type->policy, NULL);
1980 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1982 if (type->select_ops != NULL) {
1983 ops = type->select_ops(ctx,
1984 (const struct nlattr * const *)info->tb);
1996 module_put(type->owner);
2000 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2001 const struct nft_expr_info *info,
2002 struct nft_expr *expr)
2004 const struct nft_expr_ops *ops = info->ops;
2009 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2020 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2021 struct nft_expr *expr)
2023 if (expr->ops->destroy)
2024 expr->ops->destroy(ctx, expr);
2025 module_put(expr->ops->type->owner);
2028 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2029 const struct nlattr *nla)
2031 struct nft_expr_info info;
2032 struct nft_expr *expr;
2035 err = nf_tables_expr_parse(ctx, nla, &info);
2040 expr = kzalloc(info.ops->size, GFP_KERNEL);
2044 err = nf_tables_newexpr(ctx, &info, expr);
2052 module_put(info.ops->type->owner);
2054 return ERR_PTR(err);
2057 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2059 nf_tables_expr_destroy(ctx, expr);
2067 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2070 struct nft_rule *rule;
2072 // FIXME: this sucks
2073 list_for_each_entry_rcu(rule, &chain->rules, list) {
2074 if (handle == rule->handle)
2078 return ERR_PTR(-ENOENT);
2081 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2082 const struct nlattr *nla)
2085 return ERR_PTR(-EINVAL);
2087 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2090 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2091 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2092 .len = NFT_TABLE_MAXNAMELEN - 1 },
2093 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2094 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2095 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2096 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2097 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2098 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2099 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2100 .len = NFT_USERDATA_MAXLEN },
2101 [NFTA_RULE_ID] = { .type = NLA_U32 },
2104 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2105 u32 portid, u32 seq, int event,
2106 u32 flags, int family,
2107 const struct nft_table *table,
2108 const struct nft_chain *chain,
2109 const struct nft_rule *rule)
2111 struct nlmsghdr *nlh;
2112 struct nfgenmsg *nfmsg;
2113 const struct nft_expr *expr, *next;
2114 struct nlattr *list;
2115 const struct nft_rule *prule;
2116 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2118 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2120 goto nla_put_failure;
2122 nfmsg = nlmsg_data(nlh);
2123 nfmsg->nfgen_family = family;
2124 nfmsg->version = NFNETLINK_V0;
2125 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2127 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2128 goto nla_put_failure;
2129 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2130 goto nla_put_failure;
2131 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2133 goto nla_put_failure;
2135 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
2136 prule = list_prev_entry(rule, list);
2137 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2138 cpu_to_be64(prule->handle),
2140 goto nla_put_failure;
2143 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
2145 goto nla_put_failure;
2146 nft_rule_for_each_expr(expr, next, rule) {
2147 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2148 goto nla_put_failure;
2150 nla_nest_end(skb, list);
2153 struct nft_userdata *udata = nft_userdata(rule);
2154 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2156 goto nla_put_failure;
2159 nlmsg_end(skb, nlh);
2163 nlmsg_trim(skb, nlh);
2167 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2168 const struct nft_rule *rule, int event)
2170 struct sk_buff *skb;
2174 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2177 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2181 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2182 event, 0, ctx->family, ctx->table,
2189 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2190 ctx->report, GFP_KERNEL);
2193 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2196 struct nft_rule_dump_ctx {
2201 static int nf_tables_dump_rules(struct sk_buff *skb,
2202 struct netlink_callback *cb)
2204 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2205 const struct nft_rule_dump_ctx *ctx = cb->data;
2206 const struct nft_table *table;
2207 const struct nft_chain *chain;
2208 const struct nft_rule *rule;
2209 unsigned int idx = 0, s_idx = cb->args[0];
2210 struct net *net = sock_net(skb->sk);
2211 int family = nfmsg->nfgen_family;
2214 cb->seq = net->nft.base_seq;
2216 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2217 if (family != NFPROTO_UNSPEC && family != table->family)
2220 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2223 list_for_each_entry_rcu(chain, &table->chains, list) {
2224 if (ctx && ctx->chain &&
2225 strcmp(ctx->chain, chain->name) != 0)
2228 list_for_each_entry_rcu(rule, &chain->rules, list) {
2229 if (!nft_is_active(net, rule))
2234 memset(&cb->args[1], 0,
2235 sizeof(cb->args) - sizeof(cb->args[0]));
2236 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2239 NLM_F_MULTI | NLM_F_APPEND,
2241 table, chain, rule) < 0)
2244 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2257 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2259 struct nft_rule_dump_ctx *ctx = cb->data;
2269 /* called with rcu_read_lock held */
2270 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2271 struct sk_buff *skb, const struct nlmsghdr *nlh,
2272 const struct nlattr * const nla[],
2273 struct netlink_ext_ack *extack)
2275 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2276 u8 genmask = nft_genmask_cur(net);
2277 const struct nft_chain *chain;
2278 const struct nft_rule *rule;
2279 struct nft_table *table;
2280 struct sk_buff *skb2;
2281 int family = nfmsg->nfgen_family;
2284 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2285 struct netlink_dump_control c = {
2286 .dump = nf_tables_dump_rules,
2287 .done = nf_tables_dump_rules_done,
2288 .module = THIS_MODULE,
2291 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2292 struct nft_rule_dump_ctx *ctx;
2294 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2298 if (nla[NFTA_RULE_TABLE]) {
2299 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2306 if (nla[NFTA_RULE_CHAIN]) {
2307 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2318 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2321 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2322 if (IS_ERR(table)) {
2323 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2324 return PTR_ERR(table);
2327 chain = nft_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2328 if (IS_ERR(chain)) {
2329 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2330 return PTR_ERR(chain);
2333 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2335 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2336 return PTR_ERR(rule);
2339 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2343 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2344 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2345 family, table, chain, rule);
2349 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2356 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2357 struct nft_rule *rule)
2359 struct nft_expr *expr;
2362 * Careful: some expressions might not be initialized in case this
2363 * is called on error from nf_tables_newrule().
2365 expr = nft_expr_first(rule);
2366 while (expr != nft_expr_last(rule) && expr->ops) {
2367 nf_tables_expr_destroy(ctx, expr);
2368 expr = nft_expr_next(expr);
2373 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2374 struct nft_rule *rule)
2376 nft_rule_expr_deactivate(ctx, rule);
2377 nf_tables_rule_destroy(ctx, rule);
2380 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2382 struct nft_expr *expr, *last;
2383 const struct nft_data *data;
2384 struct nft_rule *rule;
2387 list_for_each_entry(rule, &chain->rules, list) {
2388 if (!nft_is_active_next(ctx->net, rule))
2391 nft_rule_for_each_expr(expr, last, rule) {
2392 if (!expr->ops->validate)
2395 err = expr->ops->validate(ctx, expr, &data);
2403 EXPORT_SYMBOL_GPL(nft_chain_validate);
2405 static int nft_table_validate(struct net *net, const struct nft_table *table)
2407 struct nft_chain *chain;
2408 struct nft_ctx ctx = {
2410 .family = table->family,
2414 list_for_each_entry(chain, &table->chains, list) {
2415 if (!nft_is_base_chain(chain))
2419 err = nft_chain_validate(&ctx, chain);
2427 #define NFT_RULE_MAXEXPRS 128
2429 static struct nft_expr_info *info;
2431 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2432 struct sk_buff *skb, const struct nlmsghdr *nlh,
2433 const struct nlattr * const nla[],
2434 struct netlink_ext_ack *extack)
2436 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2437 u8 genmask = nft_genmask_next(net);
2438 int family = nfmsg->nfgen_family;
2439 struct nft_table *table;
2440 struct nft_chain *chain;
2441 struct nft_rule *rule, *old_rule = NULL;
2442 struct nft_userdata *udata;
2443 struct nft_trans *trans = NULL;
2444 struct nft_expr *expr;
2447 unsigned int size, i, n, ulen = 0, usize = 0;
2450 u64 handle, pos_handle;
2452 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2454 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2455 if (IS_ERR(table)) {
2456 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2457 return PTR_ERR(table);
2460 chain = nft_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2461 if (IS_ERR(chain)) {
2462 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2463 return PTR_ERR(chain);
2466 if (nla[NFTA_RULE_HANDLE]) {
2467 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2468 rule = __nft_rule_lookup(chain, handle);
2470 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2471 return PTR_ERR(rule);
2474 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2475 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2478 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2483 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2485 handle = nf_tables_alloc_handle(table);
2487 if (chain->use == UINT_MAX)
2491 if (nla[NFTA_RULE_POSITION]) {
2492 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2495 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2496 old_rule = __nft_rule_lookup(chain, pos_handle);
2497 if (IS_ERR(old_rule)) {
2498 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
2499 return PTR_ERR(old_rule);
2503 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2507 if (nla[NFTA_RULE_EXPRESSIONS]) {
2508 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2510 if (nla_type(tmp) != NFTA_LIST_ELEM)
2512 if (n == NFT_RULE_MAXEXPRS)
2514 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2517 size += info[n].ops->size;
2521 /* Check for overflow of dlen field */
2523 if (size >= 1 << 12)
2526 if (nla[NFTA_RULE_USERDATA]) {
2527 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2529 usize = sizeof(struct nft_userdata) + ulen;
2533 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2537 nft_activate_next(net, rule);
2539 rule->handle = handle;
2541 rule->udata = ulen ? 1 : 0;
2544 udata = nft_userdata(rule);
2545 udata->len = ulen - 1;
2546 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2549 expr = nft_expr_first(rule);
2550 for (i = 0; i < n; i++) {
2551 err = nf_tables_newexpr(&ctx, &info[i], expr);
2555 if (info[i].ops->validate)
2556 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2559 expr = nft_expr_next(expr);
2562 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2563 if (!nft_is_active_next(net, old_rule)) {
2567 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2569 if (trans == NULL) {
2573 nft_deactivate_next(net, old_rule);
2576 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2581 list_add_tail_rcu(&rule->list, &old_rule->list);
2583 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2588 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2590 list_add_rcu(&rule->list, &old_rule->list);
2592 list_add_tail_rcu(&rule->list, &chain->rules);
2595 list_add_tail_rcu(&rule->list, &old_rule->list);
2597 list_add_rcu(&rule->list, &chain->rules);
2602 if (net->nft.validate_state == NFT_VALIDATE_DO)
2603 return nft_table_validate(net, table);
2607 nf_tables_rule_release(&ctx, rule);
2609 for (i = 0; i < n; i++) {
2610 if (info[i].ops != NULL)
2611 module_put(info[i].ops->type->owner);
2616 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2617 const struct nlattr *nla)
2619 u32 id = ntohl(nla_get_be32(nla));
2620 struct nft_trans *trans;
2622 list_for_each_entry(trans, &net->nft.commit_list, list) {
2623 struct nft_rule *rule = nft_trans_rule(trans);
2625 if (trans->msg_type == NFT_MSG_NEWRULE &&
2626 id == nft_trans_rule_id(trans))
2629 return ERR_PTR(-ENOENT);
2632 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2633 struct sk_buff *skb, const struct nlmsghdr *nlh,
2634 const struct nlattr * const nla[],
2635 struct netlink_ext_ack *extack)
2637 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2638 u8 genmask = nft_genmask_next(net);
2639 struct nft_table *table;
2640 struct nft_chain *chain = NULL;
2641 struct nft_rule *rule;
2642 int family = nfmsg->nfgen_family, err = 0;
2645 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2646 if (IS_ERR(table)) {
2647 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2648 return PTR_ERR(table);
2651 if (nla[NFTA_RULE_CHAIN]) {
2652 chain = nft_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2653 if (IS_ERR(chain)) {
2654 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2655 return PTR_ERR(chain);
2659 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2662 if (nla[NFTA_RULE_HANDLE]) {
2663 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2665 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2666 return PTR_ERR(rule);
2669 err = nft_delrule(&ctx, rule);
2670 } else if (nla[NFTA_RULE_ID]) {
2671 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2673 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
2674 return PTR_ERR(rule);
2677 err = nft_delrule(&ctx, rule);
2679 err = nft_delrule_by_chain(&ctx);
2682 list_for_each_entry(chain, &table->chains, list) {
2683 if (!nft_is_active_next(net, chain))
2687 err = nft_delrule_by_chain(&ctx);
2700 static LIST_HEAD(nf_tables_set_types);
2702 int nft_register_set(struct nft_set_type *type)
2704 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2705 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2706 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2709 EXPORT_SYMBOL_GPL(nft_register_set);
2711 void nft_unregister_set(struct nft_set_type *type)
2713 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2714 list_del_rcu(&type->list);
2715 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2717 EXPORT_SYMBOL_GPL(nft_unregister_set);
2719 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2720 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2723 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2725 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2729 * Select a set implementation based on the data characteristics and the
2730 * given policy. The total memory use might not be known if no size is
2731 * given, in that case the amount of memory per element is used.
2733 static const struct nft_set_ops *
2734 nft_select_set_ops(const struct nft_ctx *ctx,
2735 const struct nlattr * const nla[],
2736 const struct nft_set_desc *desc,
2737 enum nft_set_policies policy)
2739 const struct nft_set_ops *ops, *bops;
2740 struct nft_set_estimate est, best;
2741 const struct nft_set_type *type;
2744 #ifdef CONFIG_MODULES
2745 if (list_empty(&nf_tables_set_types)) {
2746 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2747 request_module("nft-set");
2748 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2749 if (!list_empty(&nf_tables_set_types))
2750 return ERR_PTR(-EAGAIN);
2753 if (nla[NFTA_SET_FLAGS] != NULL)
2754 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2761 list_for_each_entry(type, &nf_tables_set_types, list) {
2764 if (!nft_set_ops_candidate(type, flags))
2766 if (!ops->estimate(desc, flags, &est))
2770 case NFT_SET_POL_PERFORMANCE:
2771 if (est.lookup < best.lookup)
2773 if (est.lookup == best.lookup &&
2774 est.space < best.space)
2777 case NFT_SET_POL_MEMORY:
2779 if (est.space < best.space)
2781 if (est.space == best.space &&
2782 est.lookup < best.lookup)
2784 } else if (est.size < best.size || !bops) {
2792 if (!try_module_get(type->owner))
2795 module_put(to_set_type(bops)->owner);
2804 return ERR_PTR(-EOPNOTSUPP);
2807 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2808 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2809 .len = NFT_TABLE_MAXNAMELEN - 1 },
2810 [NFTA_SET_NAME] = { .type = NLA_STRING,
2811 .len = NFT_SET_MAXNAMELEN - 1 },
2812 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2813 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2814 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2815 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2816 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2817 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2818 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2819 [NFTA_SET_ID] = { .type = NLA_U32 },
2820 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2821 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2822 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2823 .len = NFT_USERDATA_MAXLEN },
2824 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2825 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
2828 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2829 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2832 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2833 const struct sk_buff *skb,
2834 const struct nlmsghdr *nlh,
2835 const struct nlattr * const nla[],
2836 struct netlink_ext_ack *extack,
2839 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2840 int family = nfmsg->nfgen_family;
2841 struct nft_table *table = NULL;
2843 if (nla[NFTA_SET_TABLE] != NULL) {
2844 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
2846 if (IS_ERR(table)) {
2847 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
2848 return PTR_ERR(table);
2852 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
2856 static struct nft_set *nft_set_lookup(const struct nft_table *table,
2857 const struct nlattr *nla, u8 genmask)
2859 struct nft_set *set;
2862 return ERR_PTR(-EINVAL);
2864 list_for_each_entry_rcu(set, &table->sets, list) {
2865 if (!nla_strcmp(nla, set->name) &&
2866 nft_active_genmask(set, genmask))
2869 return ERR_PTR(-ENOENT);
2872 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
2873 const struct nlattr *nla,
2876 struct nft_set *set;
2878 list_for_each_entry(set, &table->sets, list) {
2879 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
2880 nft_active_genmask(set, genmask))
2883 return ERR_PTR(-ENOENT);
2886 static struct nft_set *nft_set_lookup_byid(const struct net *net,
2887 const struct nlattr *nla, u8 genmask)
2889 struct nft_trans *trans;
2890 u32 id = ntohl(nla_get_be32(nla));
2892 list_for_each_entry(trans, &net->nft.commit_list, list) {
2893 struct nft_set *set = nft_trans_set(trans);
2895 if (trans->msg_type == NFT_MSG_NEWSET &&
2896 id == nft_trans_set_id(trans) &&
2897 nft_active_genmask(set, genmask))
2900 return ERR_PTR(-ENOENT);
2903 struct nft_set *nft_set_lookup_global(const struct net *net,
2904 const struct nft_table *table,
2905 const struct nlattr *nla_set_name,
2906 const struct nlattr *nla_set_id,
2909 struct nft_set *set;
2911 set = nft_set_lookup(table, nla_set_name, genmask);
2916 set = nft_set_lookup_byid(net, nla_set_id, genmask);
2920 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
2922 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2925 const struct nft_set *i;
2927 unsigned long *inuse;
2928 unsigned int n = 0, min = 0;
2930 p = strchr(name, '%');
2932 if (p[1] != 'd' || strchr(p + 2, '%'))
2935 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2939 list_for_each_entry(i, &ctx->table->sets, list) {
2942 if (!nft_is_active_next(ctx->net, set))
2944 if (!sscanf(i->name, name, &tmp))
2946 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2949 set_bit(tmp - min, inuse);
2952 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2953 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2954 min += BITS_PER_BYTE * PAGE_SIZE;
2955 memset(inuse, 0, PAGE_SIZE);
2958 free_page((unsigned long)inuse);
2961 set->name = kasprintf(GFP_KERNEL, name, min + n);
2965 list_for_each_entry(i, &ctx->table->sets, list) {
2966 if (!nft_is_active_next(ctx->net, i))
2968 if (!strcmp(set->name, i->name)) {
2976 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
2978 u64 ms = be64_to_cpu(nla_get_be64(nla));
2979 u64 max = (u64)(~((u64)0));
2981 max = div_u64(max, NSEC_PER_MSEC);
2985 ms *= NSEC_PER_MSEC;
2986 *result = nsecs_to_jiffies64(ms);
2990 static __be64 nf_jiffies64_to_msecs(u64 input)
2992 u64 ms = jiffies64_to_nsecs(input);
2994 return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC));
2997 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2998 const struct nft_set *set, u16 event, u16 flags)
3000 struct nfgenmsg *nfmsg;
3001 struct nlmsghdr *nlh;
3002 struct nlattr *desc;
3003 u32 portid = ctx->portid;
3006 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3007 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3010 goto nla_put_failure;
3012 nfmsg = nlmsg_data(nlh);
3013 nfmsg->nfgen_family = ctx->family;
3014 nfmsg->version = NFNETLINK_V0;
3015 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3017 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3018 goto nla_put_failure;
3019 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3020 goto nla_put_failure;
3021 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3023 goto nla_put_failure;
3024 if (set->flags != 0)
3025 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3026 goto nla_put_failure;
3028 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3029 goto nla_put_failure;
3030 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3031 goto nla_put_failure;
3032 if (set->flags & NFT_SET_MAP) {
3033 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3034 goto nla_put_failure;
3035 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3036 goto nla_put_failure;
3038 if (set->flags & NFT_SET_OBJECT &&
3039 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3040 goto nla_put_failure;
3043 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3044 nf_jiffies64_to_msecs(set->timeout),
3046 goto nla_put_failure;
3048 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3049 goto nla_put_failure;
3051 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3052 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3053 goto nla_put_failure;
3056 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3057 goto nla_put_failure;
3059 desc = nla_nest_start(skb, NFTA_SET_DESC);
3061 goto nla_put_failure;
3063 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3064 goto nla_put_failure;
3065 nla_nest_end(skb, desc);
3067 nlmsg_end(skb, nlh);
3071 nlmsg_trim(skb, nlh);
3075 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3076 const struct nft_set *set, int event,
3079 struct sk_buff *skb;
3080 u32 portid = ctx->portid;
3084 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3087 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3091 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3097 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3101 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3104 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3106 const struct nft_set *set;
3107 unsigned int idx, s_idx = cb->args[0];
3108 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3109 struct net *net = sock_net(skb->sk);
3110 struct nft_ctx *ctx = cb->data, ctx_set;
3116 cb->seq = net->nft.base_seq;
3118 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3119 if (ctx->family != NFPROTO_UNSPEC &&
3120 ctx->family != table->family)
3123 if (ctx->table && ctx->table != table)
3127 if (cur_table != table)
3133 list_for_each_entry_rcu(set, &table->sets, list) {
3136 if (!nft_is_active(net, set))
3140 ctx_set.table = table;
3141 ctx_set.family = table->family;
3143 if (nf_tables_fill_set(skb, &ctx_set, set,
3147 cb->args[2] = (unsigned long) table;
3150 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3163 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3169 /* called with rcu_read_lock held */
3170 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3171 struct sk_buff *skb, const struct nlmsghdr *nlh,
3172 const struct nlattr * const nla[],
3173 struct netlink_ext_ack *extack)
3175 u8 genmask = nft_genmask_cur(net);
3176 const struct nft_set *set;
3178 struct sk_buff *skb2;
3179 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3182 /* Verify existence before starting dump */
3183 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3188 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3189 struct netlink_dump_control c = {
3190 .dump = nf_tables_dump_sets,
3191 .done = nf_tables_dump_sets_done,
3192 .module = THIS_MODULE,
3194 struct nft_ctx *ctx_dump;
3196 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_ATOMIC);
3197 if (ctx_dump == NULL)
3203 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3206 /* Only accept unspec with dump */
3207 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3208 return -EAFNOSUPPORT;
3209 if (!nla[NFTA_SET_TABLE])
3212 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3214 return PTR_ERR(set);
3216 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3220 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3224 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3231 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
3232 struct nft_set_desc *desc,
3233 const struct nlattr *nla)
3235 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3238 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
3239 nft_set_desc_policy, NULL);
3243 if (da[NFTA_SET_DESC_SIZE] != NULL)
3244 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3249 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3250 struct sk_buff *skb, const struct nlmsghdr *nlh,
3251 const struct nlattr * const nla[],
3252 struct netlink_ext_ack *extack)
3254 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3255 u8 genmask = nft_genmask_next(net);
3256 int family = nfmsg->nfgen_family;
3257 const struct nft_set_ops *ops;
3258 struct nft_table *table;
3259 struct nft_set *set;
3265 u32 ktype, dtype, flags, policy, gc_int, objtype;
3266 struct nft_set_desc desc;
3267 unsigned char *udata;
3271 if (nla[NFTA_SET_TABLE] == NULL ||
3272 nla[NFTA_SET_NAME] == NULL ||
3273 nla[NFTA_SET_KEY_LEN] == NULL ||
3274 nla[NFTA_SET_ID] == NULL)
3277 memset(&desc, 0, sizeof(desc));
3279 ktype = NFT_DATA_VALUE;
3280 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3281 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3282 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3286 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3287 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3291 if (nla[NFTA_SET_FLAGS] != NULL) {
3292 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3293 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3294 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3295 NFT_SET_MAP | NFT_SET_EVAL |
3298 /* Only one of these operations is supported */
3299 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3300 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
3305 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3306 if (!(flags & NFT_SET_MAP))
3309 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3310 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3311 dtype != NFT_DATA_VERDICT)
3314 if (dtype != NFT_DATA_VERDICT) {
3315 if (nla[NFTA_SET_DATA_LEN] == NULL)
3317 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3318 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3321 desc.dlen = sizeof(struct nft_verdict);
3322 } else if (flags & NFT_SET_MAP)
3325 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3326 if (!(flags & NFT_SET_OBJECT))
3329 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3330 if (objtype == NFT_OBJECT_UNSPEC ||
3331 objtype > NFT_OBJECT_MAX)
3333 } else if (flags & NFT_SET_OBJECT)
3336 objtype = NFT_OBJECT_UNSPEC;
3339 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3340 if (!(flags & NFT_SET_TIMEOUT))
3343 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3348 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3349 if (!(flags & NFT_SET_TIMEOUT))
3351 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3354 policy = NFT_SET_POL_PERFORMANCE;
3355 if (nla[NFTA_SET_POLICY] != NULL)
3356 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3358 if (nla[NFTA_SET_DESC] != NULL) {
3359 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3364 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3366 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
3367 if (IS_ERR(table)) {
3368 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3369 return PTR_ERR(table);
3372 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3374 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3376 if (PTR_ERR(set) != -ENOENT) {
3377 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3378 return PTR_ERR(set);
3381 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3382 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3385 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3391 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3394 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3396 return PTR_ERR(ops);
3399 if (nla[NFTA_SET_USERDATA])
3400 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3403 if (ops->privsize != NULL)
3404 size = ops->privsize(nla, &desc);
3406 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3412 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3418 err = nf_tables_set_alloc_name(&ctx, set, name);
3425 udata = set->data + size;
3426 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3429 INIT_LIST_HEAD(&set->bindings);
3431 write_pnet(&set->net, net);
3434 set->klen = desc.klen;
3436 set->objtype = objtype;
3437 set->dlen = desc.dlen;
3439 set->size = desc.size;
3440 set->policy = policy;
3443 set->timeout = timeout;
3444 set->gc_int = gc_int;
3445 set->handle = nf_tables_alloc_handle(table);
3447 err = ops->init(set, &desc, nla);
3451 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3455 list_add_tail_rcu(&set->list, &table->sets);
3466 module_put(to_set_type(ops)->owner);
3470 static void nft_set_destroy(struct nft_set *set)
3472 set->ops->destroy(set);
3473 module_put(to_set_type(set->ops)->owner);
3478 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3480 list_del_rcu(&set->list);
3481 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3482 nft_set_destroy(set);
3485 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3486 struct sk_buff *skb, const struct nlmsghdr *nlh,
3487 const struct nlattr * const nla[],
3488 struct netlink_ext_ack *extack)
3490 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3491 u8 genmask = nft_genmask_next(net);
3492 const struct nlattr *attr;
3493 struct nft_set *set;
3497 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3498 return -EAFNOSUPPORT;
3499 if (nla[NFTA_SET_TABLE] == NULL)
3502 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3507 if (nla[NFTA_SET_HANDLE]) {
3508 attr = nla[NFTA_SET_HANDLE];
3509 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3511 attr = nla[NFTA_SET_NAME];
3512 set = nft_set_lookup(ctx.table, attr, genmask);
3516 NL_SET_BAD_ATTR(extack, attr);
3517 return PTR_ERR(set);
3519 if (!list_empty(&set->bindings) ||
3520 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3521 NL_SET_BAD_ATTR(extack, attr);
3525 return nft_delset(&ctx, set);
3528 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3529 struct nft_set *set,
3530 const struct nft_set_iter *iter,
3531 struct nft_set_elem *elem)
3533 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3534 enum nft_registers dreg;
3536 dreg = nft_type_to_reg(set->dtype);
3537 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3538 set->dtype == NFT_DATA_VERDICT ?
3539 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3543 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3544 struct nft_set_binding *binding)
3546 struct nft_set_binding *i;
3547 struct nft_set_iter iter;
3549 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3552 if (binding->flags & NFT_SET_MAP) {
3553 /* If the set is already bound to the same chain all
3554 * jumps are already validated for that chain.
3556 list_for_each_entry(i, &set->bindings, list) {
3557 if (i->flags & NFT_SET_MAP &&
3558 i->chain == binding->chain)
3562 iter.genmask = nft_genmask_next(ctx->net);
3566 iter.fn = nf_tables_bind_check_setelem;
3568 set->ops->walk(ctx, set, &iter);
3573 binding->chain = ctx->chain;
3574 list_add_tail_rcu(&binding->list, &set->bindings);
3577 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3579 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3580 struct nft_set_binding *binding)
3582 list_del_rcu(&binding->list);
3584 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
3585 nft_is_active(ctx->net, set))
3586 nf_tables_set_destroy(ctx, set);
3588 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3590 const struct nft_set_ext_type nft_set_ext_types[] = {
3591 [NFT_SET_EXT_KEY] = {
3592 .align = __alignof__(u32),
3594 [NFT_SET_EXT_DATA] = {
3595 .align = __alignof__(u32),
3597 [NFT_SET_EXT_EXPR] = {
3598 .align = __alignof__(struct nft_expr),
3600 [NFT_SET_EXT_OBJREF] = {
3601 .len = sizeof(struct nft_object *),
3602 .align = __alignof__(struct nft_object *),
3604 [NFT_SET_EXT_FLAGS] = {
3606 .align = __alignof__(u8),
3608 [NFT_SET_EXT_TIMEOUT] = {
3610 .align = __alignof__(u64),
3612 [NFT_SET_EXT_EXPIRATION] = {
3614 .align = __alignof__(u64),
3616 [NFT_SET_EXT_USERDATA] = {
3617 .len = sizeof(struct nft_userdata),
3618 .align = __alignof__(struct nft_userdata),
3621 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3627 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3628 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3629 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3630 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3631 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3632 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3633 .len = NFT_USERDATA_MAXLEN },
3634 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3635 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
3638 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3639 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3640 .len = NFT_TABLE_MAXNAMELEN - 1 },
3641 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3642 .len = NFT_SET_MAXNAMELEN - 1 },
3643 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3644 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3647 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3648 const struct sk_buff *skb,
3649 const struct nlmsghdr *nlh,
3650 const struct nlattr * const nla[],
3651 struct netlink_ext_ack *extack,
3654 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3655 int family = nfmsg->nfgen_family;
3656 struct nft_table *table;
3658 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3660 if (IS_ERR(table)) {
3661 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
3662 return PTR_ERR(table);
3665 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3669 static int nf_tables_fill_setelem(struct sk_buff *skb,
3670 const struct nft_set *set,
3671 const struct nft_set_elem *elem)
3673 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3674 unsigned char *b = skb_tail_pointer(skb);
3675 struct nlattr *nest;
3677 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3679 goto nla_put_failure;
3681 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3682 NFT_DATA_VALUE, set->klen) < 0)
3683 goto nla_put_failure;
3685 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3686 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3687 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3689 goto nla_put_failure;
3691 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3692 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3693 goto nla_put_failure;
3695 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3696 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3697 (*nft_set_ext_obj(ext))->name) < 0)
3698 goto nla_put_failure;
3700 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3701 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3702 htonl(*nft_set_ext_flags(ext))))
3703 goto nla_put_failure;
3705 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3706 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3707 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
3709 goto nla_put_failure;
3711 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3712 u64 expires, now = get_jiffies_64();
3714 expires = *nft_set_ext_expiration(ext);
3715 if (time_before64(now, expires))
3720 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3721 nf_jiffies64_to_msecs(expires),
3723 goto nla_put_failure;
3726 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3727 struct nft_userdata *udata;
3729 udata = nft_set_ext_userdata(ext);
3730 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3731 udata->len + 1, udata->data))
3732 goto nla_put_failure;
3735 nla_nest_end(skb, nest);
3743 struct nft_set_dump_args {
3744 const struct netlink_callback *cb;
3745 struct nft_set_iter iter;
3746 struct sk_buff *skb;
3749 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3750 struct nft_set *set,
3751 const struct nft_set_iter *iter,
3752 struct nft_set_elem *elem)
3754 struct nft_set_dump_args *args;
3756 args = container_of(iter, struct nft_set_dump_args, iter);
3757 return nf_tables_fill_setelem(args->skb, set, elem);
3760 struct nft_set_dump_ctx {
3761 const struct nft_set *set;
3765 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3767 struct nft_set_dump_ctx *dump_ctx = cb->data;
3768 struct net *net = sock_net(skb->sk);
3769 struct nft_table *table;
3770 struct nft_set *set;
3771 struct nft_set_dump_args args;
3772 bool set_found = false;
3773 struct nfgenmsg *nfmsg;
3774 struct nlmsghdr *nlh;
3775 struct nlattr *nest;
3780 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3781 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
3782 dump_ctx->ctx.family != table->family)
3785 if (table != dump_ctx->ctx.table)
3788 list_for_each_entry_rcu(set, &table->sets, list) {
3789 if (set == dump_ctx->set) {
3802 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
3803 portid = NETLINK_CB(cb->skb).portid;
3804 seq = cb->nlh->nlmsg_seq;
3806 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3809 goto nla_put_failure;
3811 nfmsg = nlmsg_data(nlh);
3812 nfmsg->nfgen_family = table->family;
3813 nfmsg->version = NFNETLINK_V0;
3814 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3816 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
3817 goto nla_put_failure;
3818 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3819 goto nla_put_failure;
3821 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3823 goto nla_put_failure;
3827 args.iter.genmask = nft_genmask_cur(net);
3828 args.iter.skip = cb->args[0];
3829 args.iter.count = 0;
3831 args.iter.fn = nf_tables_dump_setelem;
3832 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3835 nla_nest_end(skb, nest);
3836 nlmsg_end(skb, nlh);
3838 if (args.iter.err && args.iter.err != -EMSGSIZE)
3839 return args.iter.err;
3840 if (args.iter.count == cb->args[0])
3843 cb->args[0] = args.iter.count;
3851 static int nf_tables_dump_set_done(struct netlink_callback *cb)
3857 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3858 const struct nft_ctx *ctx, u32 seq,
3859 u32 portid, int event, u16 flags,
3860 const struct nft_set *set,
3861 const struct nft_set_elem *elem)
3863 struct nfgenmsg *nfmsg;
3864 struct nlmsghdr *nlh;
3865 struct nlattr *nest;
3868 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3869 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3872 goto nla_put_failure;
3874 nfmsg = nlmsg_data(nlh);
3875 nfmsg->nfgen_family = ctx->family;
3876 nfmsg->version = NFNETLINK_V0;
3877 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3879 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3880 goto nla_put_failure;
3881 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3882 goto nla_put_failure;
3884 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3886 goto nla_put_failure;
3888 err = nf_tables_fill_setelem(skb, set, elem);
3890 goto nla_put_failure;
3892 nla_nest_end(skb, nest);
3894 nlmsg_end(skb, nlh);
3898 nlmsg_trim(skb, nlh);
3902 static int nft_setelem_parse_flags(const struct nft_set *set,
3903 const struct nlattr *attr, u32 *flags)
3908 *flags = ntohl(nla_get_be32(attr));
3909 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3911 if (!(set->flags & NFT_SET_INTERVAL) &&
3912 *flags & NFT_SET_ELEM_INTERVAL_END)
3918 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3919 const struct nlattr *attr)
3921 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3922 const struct nft_set_ext *ext;
3923 struct nft_data_desc desc;
3924 struct nft_set_elem elem;
3925 struct sk_buff *skb;
3930 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3931 nft_set_elem_policy, NULL);
3935 if (!nla[NFTA_SET_ELEM_KEY])
3938 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3942 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3943 nla[NFTA_SET_ELEM_KEY]);
3948 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3951 priv = set->ops->get(ctx->net, set, &elem, flags);
3953 return PTR_ERR(priv);
3956 ext = nft_set_elem_ext(set, &elem);
3959 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
3963 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
3964 NFT_MSG_NEWSETELEM, 0, set, &elem);
3968 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
3969 /* This avoids a loop in nfnetlink. */
3977 /* this avoids a loop in nfnetlink. */
3978 return err == -EAGAIN ? -ENOBUFS : err;
3981 /* called with rcu_read_lock held */
3982 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3983 struct sk_buff *skb, const struct nlmsghdr *nlh,
3984 const struct nlattr * const nla[],
3985 struct netlink_ext_ack *extack)
3987 u8 genmask = nft_genmask_cur(net);
3988 struct nft_set *set;
3989 struct nlattr *attr;
3993 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
3998 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4000 return PTR_ERR(set);
4002 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4003 struct netlink_dump_control c = {
4004 .dump = nf_tables_dump_set,
4005 .done = nf_tables_dump_set_done,
4006 .module = THIS_MODULE,
4008 struct nft_set_dump_ctx *dump_ctx;
4010 dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_ATOMIC);
4014 dump_ctx->set = set;
4015 dump_ctx->ctx = ctx;
4018 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4021 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4024 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4025 err = nft_get_set_elem(&ctx, set, attr);
4033 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4034 const struct nft_set *set,
4035 const struct nft_set_elem *elem,
4036 int event, u16 flags)
4038 struct net *net = ctx->net;
4039 u32 portid = ctx->portid;
4040 struct sk_buff *skb;
4043 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4046 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4050 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4057 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4061 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4064 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4066 struct nft_set *set)
4068 struct nft_trans *trans;
4070 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4074 nft_trans_elem_set(trans) = set;
4078 void *nft_set_elem_init(const struct nft_set *set,
4079 const struct nft_set_ext_tmpl *tmpl,
4080 const u32 *key, const u32 *data,
4081 u64 timeout, gfp_t gfp)
4083 struct nft_set_ext *ext;
4086 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4090 ext = nft_set_elem_ext(set, elem);
4091 nft_set_ext_init(ext, tmpl);
4093 memcpy(nft_set_ext_key(ext), key, set->klen);
4094 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4095 memcpy(nft_set_ext_data(ext), data, set->dlen);
4096 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
4097 *nft_set_ext_expiration(ext) =
4098 get_jiffies_64() + timeout;
4099 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4100 *nft_set_ext_timeout(ext) = timeout;
4105 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4108 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4109 struct nft_ctx ctx = {
4110 .net = read_pnet(&set->net),
4111 .family = set->table->family,
4114 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4115 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4116 nft_data_release(nft_set_ext_data(ext), set->dtype);
4117 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4118 struct nft_expr *expr = nft_set_ext_expr(ext);
4120 if (expr->ops->destroy_clone) {
4121 expr->ops->destroy_clone(&ctx, expr);
4122 module_put(expr->ops->type->owner);
4124 nf_tables_expr_destroy(&ctx, expr);
4127 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4128 (*nft_set_ext_obj(ext))->use--;
4131 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4133 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4134 * the refcounting from the preparation phase.
4136 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4137 const struct nft_set *set, void *elem)
4139 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4141 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4142 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4146 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4147 const struct nlattr *attr, u32 nlmsg_flags)
4149 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4150 u8 genmask = nft_genmask_next(ctx->net);
4151 struct nft_data_desc d1, d2;
4152 struct nft_set_ext_tmpl tmpl;
4153 struct nft_set_ext *ext, *ext2;
4154 struct nft_set_elem elem;
4155 struct nft_set_binding *binding;
4156 struct nft_object *obj = NULL;
4157 struct nft_userdata *udata;
4158 struct nft_data data;
4159 enum nft_registers dreg;
4160 struct nft_trans *trans;
4166 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4167 nft_set_elem_policy, NULL);
4171 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4174 nft_set_ext_prepare(&tmpl);
4176 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4180 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4182 if (set->flags & NFT_SET_MAP) {
4183 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4184 !(flags & NFT_SET_ELEM_INTERVAL_END))
4186 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
4187 flags & NFT_SET_ELEM_INTERVAL_END)
4190 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4195 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4196 if (!(set->flags & NFT_SET_TIMEOUT))
4198 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4202 } else if (set->flags & NFT_SET_TIMEOUT) {
4203 timeout = set->timeout;
4206 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
4207 nla[NFTA_SET_ELEM_KEY]);
4211 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4214 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
4216 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4217 if (timeout != set->timeout)
4218 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4221 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4222 if (!(set->flags & NFT_SET_OBJECT)) {
4226 obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
4227 set->objtype, genmask);
4232 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4235 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4236 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4237 nla[NFTA_SET_ELEM_DATA]);
4242 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4245 dreg = nft_type_to_reg(set->dtype);
4246 list_for_each_entry(binding, &set->bindings, list) {
4247 struct nft_ctx bind_ctx = {
4249 .family = ctx->family,
4250 .table = ctx->table,
4251 .chain = (struct nft_chain *)binding->chain,
4254 if (!(binding->flags & NFT_SET_MAP))
4257 err = nft_validate_register_store(&bind_ctx, dreg,
4263 if (d2.type == NFT_DATA_VERDICT &&
4264 (data.verdict.code == NFT_GOTO ||
4265 data.verdict.code == NFT_JUMP))
4266 nft_validate_state_update(ctx->net,
4270 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4273 /* The full maximum length of userdata can exceed the maximum
4274 * offset value (U8_MAX) for following extensions, therefor it
4275 * must be the last extension added.
4278 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4279 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4281 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4286 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4287 timeout, GFP_KERNEL);
4288 if (elem.priv == NULL)
4291 ext = nft_set_elem_ext(set, elem.priv);
4293 *nft_set_ext_flags(ext) = flags;
4295 udata = nft_set_ext_userdata(ext);
4296 udata->len = ulen - 1;
4297 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4300 *nft_set_ext_obj(ext) = obj;
4304 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4308 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4309 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4311 if (err == -EEXIST) {
4312 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4313 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4314 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4315 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4319 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4320 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4321 memcmp(nft_set_ext_data(ext),
4322 nft_set_ext_data(ext2), set->dlen) != 0) ||
4323 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4324 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4325 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4327 else if (!(nlmsg_flags & NLM_F_EXCL))
4334 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4339 nft_trans_elem(trans) = elem;
4340 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4344 set->ops->remove(ctx->net, set, &elem);
4350 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4351 nft_data_release(&data, d2.type);
4353 nft_data_release(&elem.key.val, d1.type);
4358 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4359 struct sk_buff *skb, const struct nlmsghdr *nlh,
4360 const struct nlattr * const nla[],
4361 struct netlink_ext_ack *extack)
4363 u8 genmask = nft_genmask_next(net);
4364 const struct nlattr *attr;
4365 struct nft_set *set;
4369 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4372 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4377 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4378 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4380 return PTR_ERR(set);
4382 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4385 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4386 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4391 if (net->nft.validate_state == NFT_VALIDATE_DO)
4392 return nft_table_validate(net, ctx.table);
4398 * nft_data_hold - hold a nft_data item
4400 * @data: struct nft_data to release
4401 * @type: type of data
4403 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4404 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4405 * NFT_GOTO verdicts. This function must be called on active data objects
4406 * from the second phase of the commit protocol.
4408 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4410 if (type == NFT_DATA_VERDICT) {
4411 switch (data->verdict.code) {
4414 data->verdict.chain->use++;
4420 static void nft_set_elem_activate(const struct net *net,
4421 const struct nft_set *set,
4422 struct nft_set_elem *elem)
4424 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4426 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4427 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4428 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4429 (*nft_set_ext_obj(ext))->use++;
4432 static void nft_set_elem_deactivate(const struct net *net,
4433 const struct nft_set *set,
4434 struct nft_set_elem *elem)
4436 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4438 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4439 nft_data_release(nft_set_ext_data(ext), set->dtype);
4440 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4441 (*nft_set_ext_obj(ext))->use--;
4444 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4445 const struct nlattr *attr)
4447 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4448 struct nft_set_ext_tmpl tmpl;
4449 struct nft_data_desc desc;
4450 struct nft_set_elem elem;
4451 struct nft_set_ext *ext;
4452 struct nft_trans *trans;
4457 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4458 nft_set_elem_policy, NULL);
4463 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4466 nft_set_ext_prepare(&tmpl);
4468 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4472 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4474 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4475 nla[NFTA_SET_ELEM_KEY]);
4480 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4483 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4486 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4488 if (elem.priv == NULL)
4491 ext = nft_set_elem_ext(set, elem.priv);
4493 *nft_set_ext_flags(ext) = flags;
4495 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4496 if (trans == NULL) {
4501 priv = set->ops->deactivate(ctx->net, set, &elem);
4509 nft_set_elem_deactivate(ctx->net, set, &elem);
4511 nft_trans_elem(trans) = elem;
4512 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4520 nft_data_release(&elem.key.val, desc.type);
4525 static int nft_flush_set(const struct nft_ctx *ctx,
4526 struct nft_set *set,
4527 const struct nft_set_iter *iter,
4528 struct nft_set_elem *elem)
4530 struct nft_trans *trans;
4533 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4534 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4538 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4544 nft_trans_elem_set(trans) = set;
4545 nft_trans_elem(trans) = *elem;
4546 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4554 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4555 struct sk_buff *skb, const struct nlmsghdr *nlh,
4556 const struct nlattr * const nla[],
4557 struct netlink_ext_ack *extack)
4559 u8 genmask = nft_genmask_next(net);
4560 const struct nlattr *attr;
4561 struct nft_set *set;
4565 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4570 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4572 return PTR_ERR(set);
4573 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4576 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4577 struct nft_set_iter iter = {
4579 .fn = nft_flush_set,
4581 set->ops->walk(&ctx, set, &iter);
4586 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4587 err = nft_del_setelem(&ctx, set, attr);
4596 void nft_set_gc_batch_release(struct rcu_head *rcu)
4598 struct nft_set_gc_batch *gcb;
4601 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4602 for (i = 0; i < gcb->head.cnt; i++)
4603 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4606 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4608 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4611 struct nft_set_gc_batch *gcb;
4613 gcb = kzalloc(sizeof(*gcb), gfp);
4616 gcb->head.set = set;
4619 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4626 * nft_register_obj- register nf_tables stateful object type
4629 * Registers the object type for use with nf_tables. Returns zero on
4630 * success or a negative errno code otherwise.
4632 int nft_register_obj(struct nft_object_type *obj_type)
4634 if (obj_type->type == NFT_OBJECT_UNSPEC)
4637 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4638 list_add_rcu(&obj_type->list, &nf_tables_objects);
4639 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4642 EXPORT_SYMBOL_GPL(nft_register_obj);
4645 * nft_unregister_obj - unregister nf_tables object type
4648 * Unregisters the object type for use with nf_tables.
4650 void nft_unregister_obj(struct nft_object_type *obj_type)
4652 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4653 list_del_rcu(&obj_type->list);
4654 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4656 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4658 struct nft_object *nft_obj_lookup(const struct nft_table *table,
4659 const struct nlattr *nla, u32 objtype,
4662 struct nft_object *obj;
4664 list_for_each_entry_rcu(obj, &table->objects, list) {
4665 if (!nla_strcmp(nla, obj->name) &&
4666 objtype == obj->ops->type->type &&
4667 nft_active_genmask(obj, genmask))
4670 return ERR_PTR(-ENOENT);
4672 EXPORT_SYMBOL_GPL(nft_obj_lookup);
4674 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
4675 const struct nlattr *nla,
4676 u32 objtype, u8 genmask)
4678 struct nft_object *obj;
4680 list_for_each_entry(obj, &table->objects, list) {
4681 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
4682 objtype == obj->ops->type->type &&
4683 nft_active_genmask(obj, genmask))
4686 return ERR_PTR(-ENOENT);
4689 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4690 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4691 .len = NFT_TABLE_MAXNAMELEN - 1 },
4692 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4693 .len = NFT_OBJ_MAXNAMELEN - 1 },
4694 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4695 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4696 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
4699 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4700 const struct nft_object_type *type,
4701 const struct nlattr *attr)
4704 const struct nft_object_ops *ops;
4705 struct nft_object *obj;
4708 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
4713 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4718 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4721 if (type->select_ops) {
4722 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4732 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
4736 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
4749 return ERR_PTR(err);
4752 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4753 struct nft_object *obj, bool reset)
4755 struct nlattr *nest;
4757 nest = nla_nest_start(skb, attr);
4759 goto nla_put_failure;
4760 if (obj->ops->dump(skb, obj, reset) < 0)
4761 goto nla_put_failure;
4762 nla_nest_end(skb, nest);
4769 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4771 const struct nft_object_type *type;
4773 list_for_each_entry(type, &nf_tables_objects, list) {
4774 if (objtype == type->type)
4780 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4782 const struct nft_object_type *type;
4784 type = __nft_obj_type_get(objtype);
4785 if (type != NULL && try_module_get(type->owner))
4788 #ifdef CONFIG_MODULES
4790 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4791 request_module("nft-obj-%u", objtype);
4792 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4793 if (__nft_obj_type_get(objtype))
4794 return ERR_PTR(-EAGAIN);
4797 return ERR_PTR(-ENOENT);
4800 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4801 struct sk_buff *skb, const struct nlmsghdr *nlh,
4802 const struct nlattr * const nla[],
4803 struct netlink_ext_ack *extack)
4805 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4806 const struct nft_object_type *type;
4807 u8 genmask = nft_genmask_next(net);
4808 int family = nfmsg->nfgen_family;
4809 struct nft_table *table;
4810 struct nft_object *obj;
4815 if (!nla[NFTA_OBJ_TYPE] ||
4816 !nla[NFTA_OBJ_NAME] ||
4817 !nla[NFTA_OBJ_DATA])
4820 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
4821 if (IS_ERR(table)) {
4822 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
4823 return PTR_ERR(table);
4826 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4827 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4830 if (err != -ENOENT) {
4831 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
4835 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4836 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
4842 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4844 type = nft_obj_type_get(objtype);
4846 return PTR_ERR(type);
4848 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
4854 obj->handle = nf_tables_alloc_handle(table);
4856 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
4862 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4866 list_add_tail_rcu(&obj->list, &table->objects);
4872 if (obj->ops->destroy)
4873 obj->ops->destroy(&ctx, obj);
4876 module_put(type->owner);
4880 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4881 u32 portid, u32 seq, int event, u32 flags,
4882 int family, const struct nft_table *table,
4883 struct nft_object *obj, bool reset)
4885 struct nfgenmsg *nfmsg;
4886 struct nlmsghdr *nlh;
4888 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4889 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4891 goto nla_put_failure;
4893 nfmsg = nlmsg_data(nlh);
4894 nfmsg->nfgen_family = family;
4895 nfmsg->version = NFNETLINK_V0;
4896 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4898 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4899 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4900 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
4901 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4902 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
4903 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
4905 goto nla_put_failure;
4907 nlmsg_end(skb, nlh);
4911 nlmsg_trim(skb, nlh);
4915 struct nft_obj_filter {
4920 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4922 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4923 const struct nft_table *table;
4924 unsigned int idx = 0, s_idx = cb->args[0];
4925 struct nft_obj_filter *filter = cb->data;
4926 struct net *net = sock_net(skb->sk);
4927 int family = nfmsg->nfgen_family;
4928 struct nft_object *obj;
4931 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4935 cb->seq = net->nft.base_seq;
4937 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4938 if (family != NFPROTO_UNSPEC && family != table->family)
4941 list_for_each_entry_rcu(obj, &table->objects, list) {
4942 if (!nft_is_active(net, obj))
4947 memset(&cb->args[1], 0,
4948 sizeof(cb->args) - sizeof(cb->args[0]));
4949 if (filter && filter->table &&
4950 strcmp(filter->table, table->name))
4953 filter->type != NFT_OBJECT_UNSPEC &&
4954 obj->ops->type->type != filter->type)
4957 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4960 NLM_F_MULTI | NLM_F_APPEND,
4961 table->family, table,
4965 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4977 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4979 struct nft_obj_filter *filter = cb->data;
4982 kfree(filter->table);
4989 static struct nft_obj_filter *
4990 nft_obj_filter_alloc(const struct nlattr * const nla[])
4992 struct nft_obj_filter *filter;
4994 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
4996 return ERR_PTR(-ENOMEM);
4998 if (nla[NFTA_OBJ_TABLE]) {
4999 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5000 if (!filter->table) {
5002 return ERR_PTR(-ENOMEM);
5005 if (nla[NFTA_OBJ_TYPE])
5006 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5011 /* called with rcu_read_lock held */
5012 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5013 struct sk_buff *skb, const struct nlmsghdr *nlh,
5014 const struct nlattr * const nla[],
5015 struct netlink_ext_ack *extack)
5017 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5018 u8 genmask = nft_genmask_cur(net);
5019 int family = nfmsg->nfgen_family;
5020 const struct nft_table *table;
5021 struct nft_object *obj;
5022 struct sk_buff *skb2;
5027 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5028 struct netlink_dump_control c = {
5029 .dump = nf_tables_dump_obj,
5030 .done = nf_tables_dump_obj_done,
5031 .module = THIS_MODULE,
5034 if (nla[NFTA_OBJ_TABLE] ||
5035 nla[NFTA_OBJ_TYPE]) {
5036 struct nft_obj_filter *filter;
5038 filter = nft_obj_filter_alloc(nla);
5044 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5047 if (!nla[NFTA_OBJ_NAME] ||
5048 !nla[NFTA_OBJ_TYPE])
5051 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5052 if (IS_ERR(table)) {
5053 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5054 return PTR_ERR(table);
5057 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5058 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
5060 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5061 return PTR_ERR(obj);
5064 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5068 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5071 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5072 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5073 family, table, obj, reset);
5077 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5083 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5085 if (obj->ops->destroy)
5086 obj->ops->destroy(ctx, obj);
5088 module_put(obj->ops->type->owner);
5093 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5094 struct sk_buff *skb, const struct nlmsghdr *nlh,
5095 const struct nlattr * const nla[],
5096 struct netlink_ext_ack *extack)
5098 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5099 u8 genmask = nft_genmask_next(net);
5100 int family = nfmsg->nfgen_family;
5101 const struct nlattr *attr;
5102 struct nft_table *table;
5103 struct nft_object *obj;
5107 if (!nla[NFTA_OBJ_TYPE] ||
5108 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5111 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5112 if (IS_ERR(table)) {
5113 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5114 return PTR_ERR(table);
5117 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5118 if (nla[NFTA_OBJ_HANDLE]) {
5119 attr = nla[NFTA_OBJ_HANDLE];
5120 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5122 attr = nla[NFTA_OBJ_NAME];
5123 obj = nft_obj_lookup(table, attr, objtype, genmask);
5127 NL_SET_BAD_ATTR(extack, attr);
5128 return PTR_ERR(obj);
5131 NL_SET_BAD_ATTR(extack, attr);
5135 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5137 return nft_delobj(&ctx, obj);
5140 void nft_obj_notify(struct net *net, struct nft_table *table,
5141 struct nft_object *obj, u32 portid, u32 seq, int event,
5142 int family, int report, gfp_t gfp)
5144 struct sk_buff *skb;
5148 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5151 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5155 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5162 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5165 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5167 EXPORT_SYMBOL_GPL(nft_obj_notify);
5169 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5170 struct nft_object *obj, int event)
5172 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
5173 ctx->family, ctx->report, GFP_KERNEL);
5179 void nft_register_flowtable_type(struct nf_flowtable_type *type)
5181 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5182 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5183 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5185 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5187 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5189 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5190 list_del_rcu(&type->list);
5191 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5193 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5195 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5196 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5197 .len = NFT_NAME_MAXLEN - 1 },
5198 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5199 .len = NFT_NAME_MAXLEN - 1 },
5200 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
5201 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
5204 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5205 const struct nlattr *nla, u8 genmask)
5207 struct nft_flowtable *flowtable;
5209 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5210 if (!nla_strcmp(nla, flowtable->name) &&
5211 nft_active_genmask(flowtable, genmask))
5214 return ERR_PTR(-ENOENT);
5216 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
5218 static struct nft_flowtable *
5219 nft_flowtable_lookup_byhandle(const struct nft_table *table,
5220 const struct nlattr *nla, u8 genmask)
5222 struct nft_flowtable *flowtable;
5224 list_for_each_entry(flowtable, &table->flowtables, list) {
5225 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5226 nft_active_genmask(flowtable, genmask))
5229 return ERR_PTR(-ENOENT);
5232 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5233 const struct nlattr *attr,
5234 struct net_device *dev_array[], int *len)
5236 const struct nlattr *tmp;
5237 struct net_device *dev;
5238 char ifname[IFNAMSIZ];
5239 int rem, n = 0, err;
5241 nla_for_each_nested(tmp, attr, rem) {
5242 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5247 nla_strlcpy(ifname, tmp, IFNAMSIZ);
5248 dev = __dev_get_by_name(ctx->net, ifname);
5254 dev_array[n++] = dev;
5255 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5269 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5270 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5271 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5272 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5275 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5276 const struct nlattr *attr,
5277 struct nft_flowtable *flowtable)
5279 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5280 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5281 struct nf_hook_ops *ops;
5282 int hooknum, priority;
5285 err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5286 nft_flowtable_hook_policy, NULL);
5290 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5291 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5292 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5295 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5296 if (hooknum != NF_NETDEV_INGRESS)
5299 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5301 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5306 ops = kzalloc(sizeof(struct nf_hook_ops) * n, GFP_KERNEL);
5310 flowtable->hooknum = hooknum;
5311 flowtable->priority = priority;
5312 flowtable->ops = ops;
5313 flowtable->ops_len = n;
5315 for (i = 0; i < n; i++) {
5316 flowtable->ops[i].pf = NFPROTO_NETDEV;
5317 flowtable->ops[i].hooknum = hooknum;
5318 flowtable->ops[i].priority = priority;
5319 flowtable->ops[i].priv = &flowtable->data;
5320 flowtable->ops[i].hook = flowtable->data.type->hook;
5321 flowtable->ops[i].dev = dev_array[i];
5322 flowtable->dev_name[i] = kstrdup(dev_array[i]->name,
5329 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5331 const struct nf_flowtable_type *type;
5333 list_for_each_entry(type, &nf_tables_flowtables, list) {
5334 if (family == type->family)
5340 static const struct nf_flowtable_type *nft_flowtable_type_get(u8 family)
5342 const struct nf_flowtable_type *type;
5344 type = __nft_flowtable_type_get(family);
5345 if (type != NULL && try_module_get(type->owner))
5348 #ifdef CONFIG_MODULES
5350 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5351 request_module("nf-flowtable-%u", family);
5352 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5353 if (__nft_flowtable_type_get(family))
5354 return ERR_PTR(-EAGAIN);
5357 return ERR_PTR(-ENOENT);
5360 static void nft_unregister_flowtable_net_hooks(struct net *net,
5361 struct nft_flowtable *flowtable)
5365 for (i = 0; i < flowtable->ops_len; i++) {
5366 if (!flowtable->ops[i].dev)
5369 nf_unregister_net_hook(net, &flowtable->ops[i]);
5373 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5374 struct sk_buff *skb,
5375 const struct nlmsghdr *nlh,
5376 const struct nlattr * const nla[],
5377 struct netlink_ext_ack *extack)
5379 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5380 const struct nf_flowtable_type *type;
5381 struct nft_flowtable *flowtable, *ft;
5382 u8 genmask = nft_genmask_next(net);
5383 int family = nfmsg->nfgen_family;
5384 struct nft_table *table;
5388 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5389 !nla[NFTA_FLOWTABLE_NAME] ||
5390 !nla[NFTA_FLOWTABLE_HOOK])
5393 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5395 if (IS_ERR(table)) {
5396 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5397 return PTR_ERR(table);
5400 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5402 if (IS_ERR(flowtable)) {
5403 err = PTR_ERR(flowtable);
5404 if (err != -ENOENT) {
5405 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5409 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5410 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5417 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5419 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5423 flowtable->table = table;
5424 flowtable->handle = nf_tables_alloc_handle(table);
5426 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5427 if (!flowtable->name) {
5432 type = nft_flowtable_type_get(family);
5434 err = PTR_ERR(type);
5438 flowtable->data.type = type;
5439 err = type->init(&flowtable->data);
5443 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5448 for (i = 0; i < flowtable->ops_len; i++) {
5449 if (!flowtable->ops[i].dev)
5452 list_for_each_entry(ft, &table->flowtables, list) {
5453 for (k = 0; k < ft->ops_len; k++) {
5454 if (!ft->ops[k].dev)
5457 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5458 flowtable->ops[i].pf == ft->ops[k].pf) {
5465 err = nf_register_net_hook(net, &flowtable->ops[i]);
5470 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5474 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5479 i = flowtable->ops_len;
5481 for (k = i - 1; k >= 0; k--) {
5482 kfree(flowtable->dev_name[k]);
5483 nf_unregister_net_hook(net, &flowtable->ops[k]);
5486 kfree(flowtable->ops);
5488 flowtable->data.type->free(&flowtable->data);
5490 module_put(type->owner);
5492 kfree(flowtable->name);
5498 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5499 struct sk_buff *skb,
5500 const struct nlmsghdr *nlh,
5501 const struct nlattr * const nla[],
5502 struct netlink_ext_ack *extack)
5504 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5505 u8 genmask = nft_genmask_next(net);
5506 int family = nfmsg->nfgen_family;
5507 struct nft_flowtable *flowtable;
5508 const struct nlattr *attr;
5509 struct nft_table *table;
5512 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5513 (!nla[NFTA_FLOWTABLE_NAME] &&
5514 !nla[NFTA_FLOWTABLE_HANDLE]))
5517 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5519 if (IS_ERR(table)) {
5520 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5521 return PTR_ERR(table);
5524 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5525 attr = nla[NFTA_FLOWTABLE_HANDLE];
5526 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5528 attr = nla[NFTA_FLOWTABLE_NAME];
5529 flowtable = nft_flowtable_lookup(table, attr, genmask);
5532 if (IS_ERR(flowtable)) {
5533 NL_SET_BAD_ATTR(extack, attr);
5534 return PTR_ERR(flowtable);
5536 if (flowtable->use > 0) {
5537 NL_SET_BAD_ATTR(extack, attr);
5541 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5543 return nft_delflowtable(&ctx, flowtable);
5546 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5547 u32 portid, u32 seq, int event,
5548 u32 flags, int family,
5549 struct nft_flowtable *flowtable)
5551 struct nlattr *nest, *nest_devs;
5552 struct nfgenmsg *nfmsg;
5553 struct nlmsghdr *nlh;
5556 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5557 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5559 goto nla_put_failure;
5561 nfmsg = nlmsg_data(nlh);
5562 nfmsg->nfgen_family = family;
5563 nfmsg->version = NFNETLINK_V0;
5564 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5566 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5567 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5568 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5569 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5570 NFTA_FLOWTABLE_PAD))
5571 goto nla_put_failure;
5573 nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);
5574 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5575 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5576 goto nla_put_failure;
5578 nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5580 goto nla_put_failure;
5582 for (i = 0; i < flowtable->ops_len; i++) {
5583 if (flowtable->dev_name[i][0] &&
5584 nla_put_string(skb, NFTA_DEVICE_NAME,
5585 flowtable->dev_name[i]))
5586 goto nla_put_failure;
5588 nla_nest_end(skb, nest_devs);
5589 nla_nest_end(skb, nest);
5591 nlmsg_end(skb, nlh);
5595 nlmsg_trim(skb, nlh);
5599 struct nft_flowtable_filter {
5603 static int nf_tables_dump_flowtable(struct sk_buff *skb,
5604 struct netlink_callback *cb)
5606 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5607 struct nft_flowtable_filter *filter = cb->data;
5608 unsigned int idx = 0, s_idx = cb->args[0];
5609 struct net *net = sock_net(skb->sk);
5610 int family = nfmsg->nfgen_family;
5611 struct nft_flowtable *flowtable;
5612 const struct nft_table *table;
5615 cb->seq = net->nft.base_seq;
5617 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5618 if (family != NFPROTO_UNSPEC && family != table->family)
5621 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5622 if (!nft_is_active(net, flowtable))
5627 memset(&cb->args[1], 0,
5628 sizeof(cb->args) - sizeof(cb->args[0]));
5629 if (filter && filter->table &&
5630 strcmp(filter->table, table->name))
5633 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5635 NFT_MSG_NEWFLOWTABLE,
5636 NLM_F_MULTI | NLM_F_APPEND,
5637 table->family, flowtable) < 0)
5640 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5652 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
5654 struct nft_flowtable_filter *filter = cb->data;
5659 kfree(filter->table);
5665 static struct nft_flowtable_filter *
5666 nft_flowtable_filter_alloc(const struct nlattr * const nla[])
5668 struct nft_flowtable_filter *filter;
5670 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5672 return ERR_PTR(-ENOMEM);
5674 if (nla[NFTA_FLOWTABLE_TABLE]) {
5675 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5677 if (!filter->table) {
5679 return ERR_PTR(-ENOMEM);
5685 /* called with rcu_read_lock held */
5686 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
5687 struct sk_buff *skb,
5688 const struct nlmsghdr *nlh,
5689 const struct nlattr * const nla[],
5690 struct netlink_ext_ack *extack)
5692 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5693 u8 genmask = nft_genmask_cur(net);
5694 int family = nfmsg->nfgen_family;
5695 struct nft_flowtable *flowtable;
5696 const struct nft_table *table;
5697 struct sk_buff *skb2;
5700 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5701 struct netlink_dump_control c = {
5702 .dump = nf_tables_dump_flowtable,
5703 .done = nf_tables_dump_flowtable_done,
5704 .module = THIS_MODULE,
5707 if (nla[NFTA_FLOWTABLE_TABLE]) {
5708 struct nft_flowtable_filter *filter;
5710 filter = nft_flowtable_filter_alloc(nla);
5716 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5719 if (!nla[NFTA_FLOWTABLE_NAME])
5722 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5725 return PTR_ERR(table);
5727 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5729 if (IS_ERR(flowtable))
5730 return PTR_ERR(flowtable);
5732 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5736 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
5738 NFT_MSG_NEWFLOWTABLE, 0, family,
5743 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5749 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
5750 struct nft_flowtable *flowtable,
5753 struct sk_buff *skb;
5757 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
5760 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5764 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
5766 ctx->family, flowtable);
5772 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
5773 ctx->report, GFP_KERNEL);
5776 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
5779 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
5781 kfree(flowtable->ops);
5782 kfree(flowtable->name);
5783 flowtable->data.type->free(&flowtable->data);
5784 module_put(flowtable->data.type->owner);
5787 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
5788 u32 portid, u32 seq)
5790 struct nlmsghdr *nlh;
5791 struct nfgenmsg *nfmsg;
5792 char buf[TASK_COMM_LEN];
5793 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
5795 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
5797 goto nla_put_failure;
5799 nfmsg = nlmsg_data(nlh);
5800 nfmsg->nfgen_family = AF_UNSPEC;
5801 nfmsg->version = NFNETLINK_V0;
5802 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5804 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
5805 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
5806 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
5807 goto nla_put_failure;
5809 nlmsg_end(skb, nlh);
5813 nlmsg_trim(skb, nlh);
5817 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
5818 struct nft_flowtable *flowtable)
5822 for (i = 0; i < flowtable->ops_len; i++) {
5823 if (flowtable->ops[i].dev != dev)
5826 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
5827 flowtable->dev_name[i][0] = '\0';
5828 flowtable->ops[i].dev = NULL;
5833 static int nf_tables_flowtable_event(struct notifier_block *this,
5834 unsigned long event, void *ptr)
5836 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5837 struct nft_flowtable *flowtable;
5838 struct nft_table *table;
5840 if (event != NETDEV_UNREGISTER)
5843 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5844 list_for_each_entry(table, &dev_net(dev)->nft.tables, list) {
5845 list_for_each_entry(flowtable, &table->flowtables, list) {
5846 nft_flowtable_event(event, dev, flowtable);
5849 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5854 static struct notifier_block nf_tables_flowtable_notifier = {
5855 .notifier_call = nf_tables_flowtable_event,
5858 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
5861 struct nlmsghdr *nlh = nlmsg_hdr(skb);
5862 struct sk_buff *skb2;
5865 if (nlmsg_report(nlh) &&
5866 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5869 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5873 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
5880 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
5881 nlmsg_report(nlh), GFP_KERNEL);
5884 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
5888 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
5889 struct sk_buff *skb, const struct nlmsghdr *nlh,
5890 const struct nlattr * const nla[],
5891 struct netlink_ext_ack *extack)
5893 struct sk_buff *skb2;
5896 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5900 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
5905 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5911 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
5912 [NFT_MSG_NEWTABLE] = {
5913 .call_batch = nf_tables_newtable,
5914 .attr_count = NFTA_TABLE_MAX,
5915 .policy = nft_table_policy,
5917 [NFT_MSG_GETTABLE] = {
5918 .call_rcu = nf_tables_gettable,
5919 .attr_count = NFTA_TABLE_MAX,
5920 .policy = nft_table_policy,
5922 [NFT_MSG_DELTABLE] = {
5923 .call_batch = nf_tables_deltable,
5924 .attr_count = NFTA_TABLE_MAX,
5925 .policy = nft_table_policy,
5927 [NFT_MSG_NEWCHAIN] = {
5928 .call_batch = nf_tables_newchain,
5929 .attr_count = NFTA_CHAIN_MAX,
5930 .policy = nft_chain_policy,
5932 [NFT_MSG_GETCHAIN] = {
5933 .call_rcu = nf_tables_getchain,
5934 .attr_count = NFTA_CHAIN_MAX,
5935 .policy = nft_chain_policy,
5937 [NFT_MSG_DELCHAIN] = {
5938 .call_batch = nf_tables_delchain,
5939 .attr_count = NFTA_CHAIN_MAX,
5940 .policy = nft_chain_policy,
5942 [NFT_MSG_NEWRULE] = {
5943 .call_batch = nf_tables_newrule,
5944 .attr_count = NFTA_RULE_MAX,
5945 .policy = nft_rule_policy,
5947 [NFT_MSG_GETRULE] = {
5948 .call_rcu = nf_tables_getrule,
5949 .attr_count = NFTA_RULE_MAX,
5950 .policy = nft_rule_policy,
5952 [NFT_MSG_DELRULE] = {
5953 .call_batch = nf_tables_delrule,
5954 .attr_count = NFTA_RULE_MAX,
5955 .policy = nft_rule_policy,
5957 [NFT_MSG_NEWSET] = {
5958 .call_batch = nf_tables_newset,
5959 .attr_count = NFTA_SET_MAX,
5960 .policy = nft_set_policy,
5962 [NFT_MSG_GETSET] = {
5963 .call_rcu = nf_tables_getset,
5964 .attr_count = NFTA_SET_MAX,
5965 .policy = nft_set_policy,
5967 [NFT_MSG_DELSET] = {
5968 .call_batch = nf_tables_delset,
5969 .attr_count = NFTA_SET_MAX,
5970 .policy = nft_set_policy,
5972 [NFT_MSG_NEWSETELEM] = {
5973 .call_batch = nf_tables_newsetelem,
5974 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5975 .policy = nft_set_elem_list_policy,
5977 [NFT_MSG_GETSETELEM] = {
5978 .call_rcu = nf_tables_getsetelem,
5979 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5980 .policy = nft_set_elem_list_policy,
5982 [NFT_MSG_DELSETELEM] = {
5983 .call_batch = nf_tables_delsetelem,
5984 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5985 .policy = nft_set_elem_list_policy,
5987 [NFT_MSG_GETGEN] = {
5988 .call_rcu = nf_tables_getgen,
5990 [NFT_MSG_NEWOBJ] = {
5991 .call_batch = nf_tables_newobj,
5992 .attr_count = NFTA_OBJ_MAX,
5993 .policy = nft_obj_policy,
5995 [NFT_MSG_GETOBJ] = {
5996 .call_rcu = nf_tables_getobj,
5997 .attr_count = NFTA_OBJ_MAX,
5998 .policy = nft_obj_policy,
6000 [NFT_MSG_DELOBJ] = {
6001 .call_batch = nf_tables_delobj,
6002 .attr_count = NFTA_OBJ_MAX,
6003 .policy = nft_obj_policy,
6005 [NFT_MSG_GETOBJ_RESET] = {
6006 .call_rcu = nf_tables_getobj,
6007 .attr_count = NFTA_OBJ_MAX,
6008 .policy = nft_obj_policy,
6010 [NFT_MSG_NEWFLOWTABLE] = {
6011 .call_batch = nf_tables_newflowtable,
6012 .attr_count = NFTA_FLOWTABLE_MAX,
6013 .policy = nft_flowtable_policy,
6015 [NFT_MSG_GETFLOWTABLE] = {
6016 .call_rcu = nf_tables_getflowtable,
6017 .attr_count = NFTA_FLOWTABLE_MAX,
6018 .policy = nft_flowtable_policy,
6020 [NFT_MSG_DELFLOWTABLE] = {
6021 .call_batch = nf_tables_delflowtable,
6022 .attr_count = NFTA_FLOWTABLE_MAX,
6023 .policy = nft_flowtable_policy,
6027 static int nf_tables_validate(struct net *net)
6029 struct nft_table *table;
6031 switch (net->nft.validate_state) {
6032 case NFT_VALIDATE_SKIP:
6034 case NFT_VALIDATE_NEED:
6035 nft_validate_state_update(net, NFT_VALIDATE_DO);
6037 case NFT_VALIDATE_DO:
6038 list_for_each_entry(table, &net->nft.tables, list) {
6039 if (nft_table_validate(net, table) < 0)
6048 static void nft_chain_commit_update(struct nft_trans *trans)
6050 struct nft_base_chain *basechain;
6052 if (nft_trans_chain_name(trans)) {
6053 rhltable_remove(&trans->ctx.table->chains_ht,
6054 &trans->ctx.chain->rhlhead,
6055 nft_chain_ht_params);
6056 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6057 rhltable_insert_key(&trans->ctx.table->chains_ht,
6058 trans->ctx.chain->name,
6059 &trans->ctx.chain->rhlhead,
6060 nft_chain_ht_params);
6063 if (!nft_is_base_chain(trans->ctx.chain))
6066 basechain = nft_base_chain(trans->ctx.chain);
6067 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
6069 switch (nft_trans_chain_policy(trans)) {
6072 basechain->policy = nft_trans_chain_policy(trans);
6077 static void nft_commit_release(struct nft_trans *trans)
6079 switch (trans->msg_type) {
6080 case NFT_MSG_DELTABLE:
6081 nf_tables_table_destroy(&trans->ctx);
6083 case NFT_MSG_DELCHAIN:
6084 nf_tables_chain_destroy(&trans->ctx);
6086 case NFT_MSG_DELRULE:
6087 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6089 case NFT_MSG_DELSET:
6090 nft_set_destroy(nft_trans_set(trans));
6092 case NFT_MSG_DELSETELEM:
6093 nf_tables_set_elem_destroy(&trans->ctx,
6094 nft_trans_elem_set(trans),
6095 nft_trans_elem(trans).priv);
6097 case NFT_MSG_DELOBJ:
6098 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6100 case NFT_MSG_DELFLOWTABLE:
6101 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6107 static void nf_tables_commit_release(struct net *net)
6109 struct nft_trans *trans, *next;
6111 if (list_empty(&net->nft.commit_list))
6116 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6117 list_del(&trans->list);
6118 nft_commit_release(trans);
6122 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6124 struct nft_rule *rule;
6125 unsigned int alloc = 0;
6128 /* already handled or inactive chain? */
6129 if (chain->rules_next || !nft_is_active_next(net, chain))
6132 rule = list_entry(&chain->rules, struct nft_rule, list);
6135 list_for_each_entry_continue(rule, &chain->rules, list) {
6136 if (nft_is_active_next(net, rule))
6140 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6141 if (!chain->rules_next)
6144 list_for_each_entry_continue(rule, &chain->rules, list) {
6145 if (nft_is_active_next(net, rule))
6146 chain->rules_next[i++] = rule;
6149 chain->rules_next[i] = NULL;
6153 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6155 struct nft_trans *trans, *next;
6157 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6158 struct nft_chain *chain = trans->ctx.chain;
6160 if (trans->msg_type == NFT_MSG_NEWRULE ||
6161 trans->msg_type == NFT_MSG_DELRULE) {
6162 kvfree(chain->rules_next);
6163 chain->rules_next = NULL;
6168 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6170 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6175 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6177 struct nft_rule **r = rules;
6178 struct nft_rules_old *old;
6183 r++; /* rcu_head is after end marker */
6187 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6190 static void nf_tables_commit_chain_active(struct net *net, struct nft_chain *chain)
6192 struct nft_rule **g0, **g1;
6195 next_genbit = nft_gencursor_next(net);
6197 g0 = rcu_dereference_protected(chain->rules_gen_0,
6198 lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
6199 g1 = rcu_dereference_protected(chain->rules_gen_1,
6200 lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
6202 /* No changes to this chain? */
6203 if (chain->rules_next == NULL) {
6204 /* chain had no change in last or next generation */
6208 * chain had no change in this generation; make sure next
6209 * one uses same rules as current generation.
6212 rcu_assign_pointer(chain->rules_gen_1, g0);
6213 nf_tables_commit_chain_free_rules_old(g1);
6215 rcu_assign_pointer(chain->rules_gen_0, g1);
6216 nf_tables_commit_chain_free_rules_old(g0);
6223 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6225 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6227 chain->rules_next = NULL;
6233 nf_tables_commit_chain_free_rules_old(g1);
6235 nf_tables_commit_chain_free_rules_old(g0);
6238 static void nft_chain_del(struct nft_chain *chain)
6240 struct nft_table *table = chain->table;
6242 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6243 nft_chain_ht_params));
6244 list_del_rcu(&chain->list);
6247 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
6249 struct nft_trans *trans, *next;
6250 struct nft_trans_elem *te;
6251 struct nft_chain *chain;
6252 struct nft_table *table;
6254 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6255 if (nf_tables_validate(net) < 0)
6258 /* 1. Allocate space for next generation rules_gen_X[] */
6259 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6262 if (trans->msg_type == NFT_MSG_NEWRULE ||
6263 trans->msg_type == NFT_MSG_DELRULE) {
6264 chain = trans->ctx.chain;
6266 ret = nf_tables_commit_chain_prepare(net, chain);
6268 nf_tables_commit_chain_prepare_cancel(net);
6274 /* step 2. Make rules_gen_X visible to packet path */
6275 list_for_each_entry(table, &net->nft.tables, list) {
6276 list_for_each_entry(chain, &table->chains, list) {
6277 if (!nft_is_active_next(net, chain))
6279 nf_tables_commit_chain_active(net, chain);
6284 * Bump generation counter, invalidate any dump in progress.
6285 * Cannot fail after this point.
6287 while (++net->nft.base_seq == 0);
6289 /* step 3. Start new generation, rules_gen_X now in use. */
6290 net->nft.gencursor = nft_gencursor_next(net);
6292 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6293 switch (trans->msg_type) {
6294 case NFT_MSG_NEWTABLE:
6295 if (nft_trans_table_update(trans)) {
6296 if (!nft_trans_table_enable(trans)) {
6297 nf_tables_table_disable(net,
6299 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6302 nft_clear(net, trans->ctx.table);
6304 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
6305 nft_trans_destroy(trans);
6307 case NFT_MSG_DELTABLE:
6308 list_del_rcu(&trans->ctx.table->list);
6309 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
6311 case NFT_MSG_NEWCHAIN:
6312 if (nft_trans_chain_update(trans))
6313 nft_chain_commit_update(trans);
6315 nft_clear(net, trans->ctx.chain);
6317 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6318 nft_trans_destroy(trans);
6320 case NFT_MSG_DELCHAIN:
6321 nft_chain_del(trans->ctx.chain);
6322 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
6323 nf_tables_unregister_hook(trans->ctx.net,
6327 case NFT_MSG_NEWRULE:
6328 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6329 nf_tables_rule_notify(&trans->ctx,
6330 nft_trans_rule(trans),
6332 nft_trans_destroy(trans);
6334 case NFT_MSG_DELRULE:
6335 list_del_rcu(&nft_trans_rule(trans)->list);
6336 nf_tables_rule_notify(&trans->ctx,
6337 nft_trans_rule(trans),
6340 case NFT_MSG_NEWSET:
6341 nft_clear(net, nft_trans_set(trans));
6342 /* This avoids hitting -EBUSY when deleting the table
6343 * from the transaction.
6345 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
6346 !list_empty(&nft_trans_set(trans)->bindings))
6347 trans->ctx.table->use--;
6349 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6350 NFT_MSG_NEWSET, GFP_KERNEL);
6351 nft_trans_destroy(trans);
6353 case NFT_MSG_DELSET:
6354 list_del_rcu(&nft_trans_set(trans)->list);
6355 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6356 NFT_MSG_DELSET, GFP_KERNEL);
6358 case NFT_MSG_NEWSETELEM:
6359 te = (struct nft_trans_elem *)trans->data;
6361 te->set->ops->activate(net, te->set, &te->elem);
6362 nf_tables_setelem_notify(&trans->ctx, te->set,
6364 NFT_MSG_NEWSETELEM, 0);
6365 nft_trans_destroy(trans);
6367 case NFT_MSG_DELSETELEM:
6368 te = (struct nft_trans_elem *)trans->data;
6370 nf_tables_setelem_notify(&trans->ctx, te->set,
6372 NFT_MSG_DELSETELEM, 0);
6373 te->set->ops->remove(net, te->set, &te->elem);
6374 atomic_dec(&te->set->nelems);
6377 case NFT_MSG_NEWOBJ:
6378 nft_clear(net, nft_trans_obj(trans));
6379 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6381 nft_trans_destroy(trans);
6383 case NFT_MSG_DELOBJ:
6384 list_del_rcu(&nft_trans_obj(trans)->list);
6385 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6388 case NFT_MSG_NEWFLOWTABLE:
6389 nft_clear(net, nft_trans_flowtable(trans));
6390 nf_tables_flowtable_notify(&trans->ctx,
6391 nft_trans_flowtable(trans),
6392 NFT_MSG_NEWFLOWTABLE);
6393 nft_trans_destroy(trans);
6395 case NFT_MSG_DELFLOWTABLE:
6396 list_del_rcu(&nft_trans_flowtable(trans)->list);
6397 nf_tables_flowtable_notify(&trans->ctx,
6398 nft_trans_flowtable(trans),
6399 NFT_MSG_DELFLOWTABLE);
6400 nft_unregister_flowtable_net_hooks(net,
6401 nft_trans_flowtable(trans));
6406 nf_tables_commit_release(net);
6407 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
6412 static void nf_tables_abort_release(struct nft_trans *trans)
6414 switch (trans->msg_type) {
6415 case NFT_MSG_NEWTABLE:
6416 nf_tables_table_destroy(&trans->ctx);
6418 case NFT_MSG_NEWCHAIN:
6419 nf_tables_chain_destroy(&trans->ctx);
6421 case NFT_MSG_NEWRULE:
6422 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6424 case NFT_MSG_NEWSET:
6425 nft_set_destroy(nft_trans_set(trans));
6427 case NFT_MSG_NEWSETELEM:
6428 nft_set_elem_destroy(nft_trans_elem_set(trans),
6429 nft_trans_elem(trans).priv, true);
6431 case NFT_MSG_NEWOBJ:
6432 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6434 case NFT_MSG_NEWFLOWTABLE:
6435 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6441 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6443 struct nft_trans *trans, *next;
6444 struct nft_trans_elem *te;
6446 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6448 switch (trans->msg_type) {
6449 case NFT_MSG_NEWTABLE:
6450 if (nft_trans_table_update(trans)) {
6451 if (nft_trans_table_enable(trans)) {
6452 nf_tables_table_disable(net,
6454 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6456 nft_trans_destroy(trans);
6458 list_del_rcu(&trans->ctx.table->list);
6461 case NFT_MSG_DELTABLE:
6462 nft_clear(trans->ctx.net, trans->ctx.table);
6463 nft_trans_destroy(trans);
6465 case NFT_MSG_NEWCHAIN:
6466 if (nft_trans_chain_update(trans)) {
6467 free_percpu(nft_trans_chain_stats(trans));
6469 nft_trans_destroy(trans);
6471 trans->ctx.table->use--;
6472 nft_chain_del(trans->ctx.chain);
6473 nf_tables_unregister_hook(trans->ctx.net,
6478 case NFT_MSG_DELCHAIN:
6479 trans->ctx.table->use++;
6480 nft_clear(trans->ctx.net, trans->ctx.chain);
6481 nft_trans_destroy(trans);
6483 case NFT_MSG_NEWRULE:
6484 trans->ctx.chain->use--;
6485 list_del_rcu(&nft_trans_rule(trans)->list);
6486 nft_rule_expr_deactivate(&trans->ctx, nft_trans_rule(trans));
6488 case NFT_MSG_DELRULE:
6489 trans->ctx.chain->use++;
6490 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6491 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
6492 nft_trans_destroy(trans);
6494 case NFT_MSG_NEWSET:
6495 trans->ctx.table->use--;
6496 list_del_rcu(&nft_trans_set(trans)->list);
6498 case NFT_MSG_DELSET:
6499 trans->ctx.table->use++;
6500 nft_clear(trans->ctx.net, nft_trans_set(trans));
6501 nft_trans_destroy(trans);
6503 case NFT_MSG_NEWSETELEM:
6504 te = (struct nft_trans_elem *)trans->data;
6506 te->set->ops->remove(net, te->set, &te->elem);
6507 atomic_dec(&te->set->nelems);
6509 case NFT_MSG_DELSETELEM:
6510 te = (struct nft_trans_elem *)trans->data;
6512 nft_set_elem_activate(net, te->set, &te->elem);
6513 te->set->ops->activate(net, te->set, &te->elem);
6516 nft_trans_destroy(trans);
6518 case NFT_MSG_NEWOBJ:
6519 trans->ctx.table->use--;
6520 list_del_rcu(&nft_trans_obj(trans)->list);
6522 case NFT_MSG_DELOBJ:
6523 trans->ctx.table->use++;
6524 nft_clear(trans->ctx.net, nft_trans_obj(trans));
6525 nft_trans_destroy(trans);
6527 case NFT_MSG_NEWFLOWTABLE:
6528 trans->ctx.table->use--;
6529 list_del_rcu(&nft_trans_flowtable(trans)->list);
6530 nft_unregister_flowtable_net_hooks(net,
6531 nft_trans_flowtable(trans));
6533 case NFT_MSG_DELFLOWTABLE:
6534 trans->ctx.table->use++;
6535 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6536 nft_trans_destroy(trans);
6543 list_for_each_entry_safe_reverse(trans, next,
6544 &net->nft.commit_list, list) {
6545 list_del(&trans->list);
6546 nf_tables_abort_release(trans);
6552 static void nf_tables_cleanup(struct net *net)
6554 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
6557 static bool nf_tables_valid_genid(struct net *net, u32 genid)
6559 return net->nft.base_seq == genid;
6562 static const struct nfnetlink_subsystem nf_tables_subsys = {
6563 .name = "nf_tables",
6564 .subsys_id = NFNL_SUBSYS_NFTABLES,
6565 .cb_count = NFT_MSG_MAX,
6567 .commit = nf_tables_commit,
6568 .abort = nf_tables_abort,
6569 .cleanup = nf_tables_cleanup,
6570 .valid_genid = nf_tables_valid_genid,
6573 int nft_chain_validate_dependency(const struct nft_chain *chain,
6574 enum nft_chain_types type)
6576 const struct nft_base_chain *basechain;
6578 if (nft_is_base_chain(chain)) {
6579 basechain = nft_base_chain(chain);
6580 if (basechain->type->type != type)
6585 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
6587 int nft_chain_validate_hooks(const struct nft_chain *chain,
6588 unsigned int hook_flags)
6590 struct nft_base_chain *basechain;
6592 if (nft_is_base_chain(chain)) {
6593 basechain = nft_base_chain(chain);
6595 if ((1 << basechain->ops.hooknum) & hook_flags)
6603 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
6606 * Loop detection - walk through the ruleset beginning at the destination chain
6607 * of a new jump until either the source chain is reached (loop) or all
6608 * reachable chains have been traversed.
6610 * The loop check is performed whenever a new jump verdict is added to an
6611 * expression or verdict map or a verdict map is bound to a new chain.
6614 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6615 const struct nft_chain *chain);
6617 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
6618 struct nft_set *set,
6619 const struct nft_set_iter *iter,
6620 struct nft_set_elem *elem)
6622 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6623 const struct nft_data *data;
6625 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6626 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
6629 data = nft_set_ext_data(ext);
6630 switch (data->verdict.code) {
6633 return nf_tables_check_loops(ctx, data->verdict.chain);
6639 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6640 const struct nft_chain *chain)
6642 const struct nft_rule *rule;
6643 const struct nft_expr *expr, *last;
6644 struct nft_set *set;
6645 struct nft_set_binding *binding;
6646 struct nft_set_iter iter;
6648 if (ctx->chain == chain)
6651 list_for_each_entry(rule, &chain->rules, list) {
6652 nft_rule_for_each_expr(expr, last, rule) {
6653 struct nft_immediate_expr *priv;
6654 const struct nft_data *data;
6657 if (strcmp(expr->ops->type->name, "immediate"))
6660 priv = nft_expr_priv(expr);
6661 if (priv->dreg != NFT_REG_VERDICT)
6665 switch (data->verdict.code) {
6668 err = nf_tables_check_loops(ctx,
6669 data->verdict.chain);
6678 list_for_each_entry(set, &ctx->table->sets, list) {
6679 if (!nft_is_active_next(ctx->net, set))
6681 if (!(set->flags & NFT_SET_MAP) ||
6682 set->dtype != NFT_DATA_VERDICT)
6685 list_for_each_entry(binding, &set->bindings, list) {
6686 if (!(binding->flags & NFT_SET_MAP) ||
6687 binding->chain != chain)
6690 iter.genmask = nft_genmask_next(ctx->net);
6694 iter.fn = nf_tables_loop_check_setelem;
6696 set->ops->walk(ctx, set, &iter);
6706 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
6708 * @attr: netlink attribute to fetch value from
6709 * @max: maximum value to be stored in dest
6710 * @dest: pointer to the variable
6712 * Parse, check and store a given u32 netlink attribute into variable.
6713 * This function returns -ERANGE if the value goes over maximum value.
6714 * Otherwise a 0 is returned and the attribute value is stored in the
6715 * destination variable.
6717 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
6721 val = ntohl(nla_get_be32(attr));
6728 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
6731 * nft_parse_register - parse a register value from a netlink attribute
6733 * @attr: netlink attribute
6735 * Parse and translate a register value from a netlink attribute.
6736 * Registers used to be 128 bit wide, these register numbers will be
6737 * mapped to the corresponding 32 bit register numbers.
6739 unsigned int nft_parse_register(const struct nlattr *attr)
6743 reg = ntohl(nla_get_be32(attr));
6745 case NFT_REG_VERDICT...NFT_REG_4:
6746 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
6748 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
6751 EXPORT_SYMBOL_GPL(nft_parse_register);
6754 * nft_dump_register - dump a register value to a netlink attribute
6756 * @skb: socket buffer
6757 * @attr: attribute number
6758 * @reg: register number
6760 * Construct a netlink attribute containing the register number. For
6761 * compatibility reasons, register numbers being a multiple of 4 are
6762 * translated to the corresponding 128 bit register numbers.
6764 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
6766 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
6767 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
6769 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
6771 return nla_put_be32(skb, attr, htonl(reg));
6773 EXPORT_SYMBOL_GPL(nft_dump_register);
6776 * nft_validate_register_load - validate a load from a register
6778 * @reg: the register number
6779 * @len: the length of the data
6781 * Validate that the input register is one of the general purpose
6782 * registers and that the length of the load is within the bounds.
6784 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
6786 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
6790 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
6795 EXPORT_SYMBOL_GPL(nft_validate_register_load);
6798 * nft_validate_register_store - validate an expressions' register store
6800 * @ctx: context of the expression performing the load
6801 * @reg: the destination register number
6802 * @data: the data to load
6803 * @type: the data type
6804 * @len: the length of the data
6806 * Validate that a data load uses the appropriate data type for
6807 * the destination register and the length is within the bounds.
6808 * A value of NULL for the data means that its runtime gathered
6811 int nft_validate_register_store(const struct nft_ctx *ctx,
6812 enum nft_registers reg,
6813 const struct nft_data *data,
6814 enum nft_data_types type, unsigned int len)
6819 case NFT_REG_VERDICT:
6820 if (type != NFT_DATA_VERDICT)
6824 (data->verdict.code == NFT_GOTO ||
6825 data->verdict.code == NFT_JUMP)) {
6826 err = nf_tables_check_loops(ctx, data->verdict.chain);
6830 if (ctx->chain->level + 1 >
6831 data->verdict.chain->level) {
6832 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
6834 data->verdict.chain->level = ctx->chain->level + 1;
6840 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
6844 if (reg * NFT_REG32_SIZE + len >
6845 FIELD_SIZEOF(struct nft_regs, data))
6848 if (data != NULL && type != NFT_DATA_VALUE)
6853 EXPORT_SYMBOL_GPL(nft_validate_register_store);
6855 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
6856 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
6857 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
6858 .len = NFT_CHAIN_MAXNAMELEN - 1 },
6861 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
6862 struct nft_data_desc *desc, const struct nlattr *nla)
6864 u8 genmask = nft_genmask_next(ctx->net);
6865 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
6866 struct nft_chain *chain;
6869 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
6874 if (!tb[NFTA_VERDICT_CODE])
6876 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
6878 switch (data->verdict.code) {
6880 switch (data->verdict.code & NF_VERDICT_MASK) {
6895 if (!tb[NFTA_VERDICT_CHAIN])
6897 chain = nft_chain_lookup(ctx->table, tb[NFTA_VERDICT_CHAIN],
6900 return PTR_ERR(chain);
6901 if (nft_is_base_chain(chain))
6905 data->verdict.chain = chain;
6909 desc->len = sizeof(data->verdict);
6910 desc->type = NFT_DATA_VERDICT;
6914 static void nft_verdict_uninit(const struct nft_data *data)
6916 switch (data->verdict.code) {
6919 data->verdict.chain->use--;
6924 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
6926 struct nlattr *nest;
6928 nest = nla_nest_start(skb, type);
6930 goto nla_put_failure;
6932 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
6933 goto nla_put_failure;
6938 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
6940 goto nla_put_failure;
6942 nla_nest_end(skb, nest);
6949 static int nft_value_init(const struct nft_ctx *ctx,
6950 struct nft_data *data, unsigned int size,
6951 struct nft_data_desc *desc, const struct nlattr *nla)
6961 nla_memcpy(data->data, nla, len);
6962 desc->type = NFT_DATA_VALUE;
6967 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
6970 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
6973 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
6974 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
6975 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
6979 * nft_data_init - parse nf_tables data netlink attributes
6981 * @ctx: context of the expression using the data
6982 * @data: destination struct nft_data
6983 * @size: maximum data length
6984 * @desc: data description
6985 * @nla: netlink attribute containing data
6987 * Parse the netlink data attributes and initialize a struct nft_data.
6988 * The type and length of data are returned in the data description.
6990 * The caller can indicate that it only wants to accept data of type
6991 * NFT_DATA_VALUE by passing NULL for the ctx argument.
6993 int nft_data_init(const struct nft_ctx *ctx,
6994 struct nft_data *data, unsigned int size,
6995 struct nft_data_desc *desc, const struct nlattr *nla)
6997 struct nlattr *tb[NFTA_DATA_MAX + 1];
7000 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
7004 if (tb[NFTA_DATA_VALUE])
7005 return nft_value_init(ctx, data, size, desc,
7006 tb[NFTA_DATA_VALUE]);
7007 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7008 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7011 EXPORT_SYMBOL_GPL(nft_data_init);
7014 * nft_data_release - release a nft_data item
7016 * @data: struct nft_data to release
7017 * @type: type of data
7019 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7020 * all others need to be released by calling this function.
7022 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
7024 if (type < NFT_DATA_VERDICT)
7027 case NFT_DATA_VERDICT:
7028 return nft_verdict_uninit(data);
7033 EXPORT_SYMBOL_GPL(nft_data_release);
7035 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7036 enum nft_data_types type, unsigned int len)
7038 struct nlattr *nest;
7041 nest = nla_nest_start(skb, attr);
7046 case NFT_DATA_VALUE:
7047 err = nft_value_dump(skb, data, len);
7049 case NFT_DATA_VERDICT:
7050 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
7057 nla_nest_end(skb, nest);
7060 EXPORT_SYMBOL_GPL(nft_data_dump);
7062 int __nft_release_basechain(struct nft_ctx *ctx)
7064 struct nft_rule *rule, *nr;
7066 BUG_ON(!nft_is_base_chain(ctx->chain));
7068 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
7069 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7070 list_del(&rule->list);
7072 nf_tables_rule_release(ctx, rule);
7074 nft_chain_del(ctx->chain);
7076 nf_tables_chain_destroy(ctx);
7080 EXPORT_SYMBOL_GPL(__nft_release_basechain);
7082 static void __nft_release_tables(struct net *net)
7084 struct nft_flowtable *flowtable, *nf;
7085 struct nft_table *table, *nt;
7086 struct nft_chain *chain, *nc;
7087 struct nft_object *obj, *ne;
7088 struct nft_rule *rule, *nr;
7089 struct nft_set *set, *ns;
7090 struct nft_ctx ctx = {
7092 .family = NFPROTO_NETDEV,
7095 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
7096 ctx.family = table->family;
7098 list_for_each_entry(chain, &table->chains, list)
7099 nf_tables_unregister_hook(net, table, chain);
7100 list_for_each_entry(flowtable, &table->flowtables, list)
7101 nf_unregister_net_hooks(net, flowtable->ops,
7102 flowtable->ops_len);
7103 /* No packets are walking on these chains anymore. */
7105 list_for_each_entry(chain, &table->chains, list) {
7107 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7108 list_del(&rule->list);
7110 nf_tables_rule_release(&ctx, rule);
7113 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7114 list_del(&flowtable->list);
7116 nf_tables_flowtable_destroy(flowtable);
7118 list_for_each_entry_safe(set, ns, &table->sets, list) {
7119 list_del(&set->list);
7121 nft_set_destroy(set);
7123 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7124 list_del(&obj->list);
7126 nft_obj_destroy(&ctx, obj);
7128 list_for_each_entry_safe(chain, nc, &table->chains, list) {
7130 nft_chain_del(chain);
7132 nf_tables_chain_destroy(&ctx);
7134 list_del(&table->list);
7135 nf_tables_table_destroy(&ctx);
7139 static int __net_init nf_tables_init_net(struct net *net)
7141 INIT_LIST_HEAD(&net->nft.tables);
7142 INIT_LIST_HEAD(&net->nft.commit_list);
7143 net->nft.base_seq = 1;
7144 net->nft.validate_state = NFT_VALIDATE_SKIP;
7149 static void __net_exit nf_tables_exit_net(struct net *net)
7151 __nft_release_tables(net);
7152 WARN_ON_ONCE(!list_empty(&net->nft.tables));
7153 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7156 static struct pernet_operations nf_tables_net_ops = {
7157 .init = nf_tables_init_net,
7158 .exit = nf_tables_exit_net,
7161 static int __init nf_tables_module_init(void)
7165 nft_chain_filter_init();
7167 info = kmalloc_array(NFT_RULE_MAXEXPRS, sizeof(struct nft_expr_info),
7174 err = nf_tables_core_module_init();
7178 err = nfnetlink_subsys_register(&nf_tables_subsys);
7182 register_netdevice_notifier(&nf_tables_flowtable_notifier);
7184 return register_pernet_subsys(&nf_tables_net_ops);
7186 nf_tables_core_module_exit();
7193 static void __exit nf_tables_module_exit(void)
7195 unregister_pernet_subsys(&nf_tables_net_ops);
7196 nfnetlink_subsys_unregister(&nf_tables_subsys);
7197 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7199 nf_tables_core_module_exit();
7201 nft_chain_filter_fini();
7204 module_init(nf_tables_module_init);
7205 module_exit(nf_tables_module_exit);
7207 MODULE_LICENSE("GPL");
7208 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7209 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);